IMPACT TOOL

An impact tool includes a light emitter unit that is isolated from vibrations. An impact tool includes a motor, a hammer rotatable by the motor, an anvil strikable by the hammer in a rotation direction, a hammer case accommodating the hammer, a light emitter unit including a light emitter that illuminates an area adjacent to a front end of the anvil, and a radial elastic member supported by the hammer case and supporting the light emitter unit from radially inside.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of priority to Japanese Patent Application No. 2023-005661, filed on Jan. 18, 2023, and Japanese Patent Application No. 2023-149973, filed on Sep. 15, 2023, the entire contents of which are hereby incorporated by reference.

BACKGROUND

1. Technical Field

The present disclosure relates to an impact tool.

2. Description of the Background

In the technical field of power tools, a handheld impact tool is known as described in U.S. Pat. No. 8,496,366. A known handheld power tool includes a cover fixable to the housing to cover a light substrate and a substrate buffer.

BRIEF SUMMARY

A known impact tool includes an annular light-emitting diode (LED) mounted on the distal end of its hammer case. The LED illuminates a workpiece to improve workability in darkness. A lens to transmit light from the LED typically includes a transparent resin component. Recent impact tools that can output higher power may have a larger weight and cause more vibrations. In a known structure, the lens and the LED are received in an annular recess on the distal end of a hammer case. The hammer case and the lens are covered with a hammer case cover to absorb a shock. However, for a heavy high-power product, the hammer case cover cannot fully absorb a shock to the product resulting from a drop, causing the outer circumference of the hammer case to deform and break the lens and the substrate. More specifically, an outer rib defines an annular recess in which the lens and the substrate are received. When the product is dropped, the outer rib receives a shock through the hammer case cover. For a heavy product, the outer rib may deform under the shock, possibly damaging the lens or the substrate inside the outer rib. In a known structure, the hammer case has an annular recess on its distal end to receive a buffer, a substrate, and a lens. The buffer is located between the substrate and the bottom of the recess to protect the substrate from vibrations and heat generated during striking. In this structure, the lens and the substrate are supported in direct contact with the hammer case. When a high-power product produces large vibrations, such vibrations may damage the substrate or the lens. The lens is directly supported by the hammer case in the radial direction, and a vibration component other than in the axial direction propagates to the substrate through the lens.

One or more aspects of the present disclosure are directed to an impact tool including a light emitter unit that is isolated from vibrations.

A first aspect of the present disclosure provides an impact tool, including:a motor;a hammer rotatable by the motor;an anvil strikable by the hammer in a rotation direction;a hammer case accommodating the hammer;a light emitter unit including a light emitter configured to illuminate an area adjacent to a front end of the anvil; anda radial elastic member supported by the hammer case and supporting the light emitter unit from radially inside.

A second aspect of the present disclosure provides an impact tool, including:a motor;a hammer rotatable by the motor;an anvil strikable by the hammer in a rotation direction;a hammer case accommodating the hammer;a light emitter unit including a light emitter configured to illuminate an area adjacent to a front end of the anvil; andan axial elastic member supported by the hammer case, the axial elastic member including an axial base and a cover, the axial base supporting the light emitter unit from rear, the cover covering the light emitter unit from radially outside.

A third aspect of the present disclosure provides an impact tool, including:a motor;a hammer rotatable by the motor;an anvil strikable by the hammer in a rotation direction;a hammer case accommodating the hammer;a light emitter unit including a light emitter configured to illuminate an area adjacent to a front end of the anvil;an elastic member supported by the hammer case, the elastic member including a front support supporting the light emitter unit from front; anda fastener fastened to at least a part of the hammer case and supporting the front support from front.

A fourth aspect of the present disclosure provides an impact tool, including:a motor;a hammer rotatable by the motor;an anvil strikable by the hammer in a rotation direction;a hammer case accommodating the hammer;a light emitter unit including a light emitter configured to illuminate an area adjacent to a front end of the anvil; andan elastic member supported by the hammer case and supporting the light emitter unit from at least three of radially inside, radially outside, rear, or front.

A fifth aspect of the present disclosure provides an impact tool, including:a motor;an output unit located frontward from the motor, the output unit being rotatable about an output rotation axis extending in a front-rear direction with a rotational force from the motor;a bearing supporting the output unit in a rotatable manner;a case holding the bearing;a light assembly surrounding the case; anda front bumper located frontward from the light assembly and covering at least a part of a surface of the case, the front bumper comprising rubber and being in contact with at least a part of a front surface of the light assembly.

The impact tool according to the above aspects of the present disclosure includes a light emitter unit that is isolated from vibrations.

DETAILED DESCRIPTION

A first aspect of the present disclosure provides an impact tool (1), comprising:a motor (10);a hammer (71) rotatable by the motor (10);an anvil (16) strikable by the hammer (71) in a rotation direction;a hammer case (6) accommodating the hammer (71);a light emitter unit (90) including a light emitter (95B) configured to illuminate a front end of the anvil (16) and an area adjacent to the front end of the anvil (16); anda radial elastic member (92) supported by the hammer case (6) and supporting the light emitter unit (90) from radially inside.

A second aspect of the present disclosure provides the impact tool (1) according to the first aspect in whichthe hammer case (6) includesa first cylinder (61) surrounding the hammer (71),a second cylinder (62) located frontward from the first cylinder (61) and having a smaller outer diameter than the first cylinder (61), anda front wall (63) connecting a front end of the first cylinder (61) and a rear end of the second cylinder (62),the light emitter unit (90) at least partially surrounds the second cylinder (62), andthe radial elastic member (92) includes a radial base (92A) between the second cylinder (62) and the light emitter unit (90) in a radial direction.

A third aspect of the present disclosure provides the impact tool (1) according to the second aspect in whichthe radial base (92A) includesan inner circumferential surface facing an outer circumferential surface of the second cylinder (62), anda radial rib (92D) protruding radially inward from the inner circumferential surface, the radial rib (92D) being in contact with the outer circumferential surface of the second cylinder (62).

A fourth aspect of the present disclosure provides the impact tool (1) according to the second aspect or the third aspect in whichthe radial base (92A) is in contact with an inner circumferential surface of the light emitter unit (90).

A fifth aspect of the present disclosure provides the impact tool (1) according to any one of the second to fourth aspects in whichthe radial elastic member (92A) includes a rear support (92B) supporting the light emitter unit (90) from rear.

A sixth aspect of the present disclosure provides the impact tool (1) according to the fifth aspect in whichthe rear support (92B) includesa rear surface facing a front surface of the front wall (63), anda first axial rib (92F) protruding rearward from the rear surface, the first axial rib (92F) being in contact with the front surface of the front wall (63).

A seventh aspect of the present disclosure provides the impact tool (1) according to the fifth aspect or the sixth aspect in whichthe rear support (92B) is in contact with a rear surface of the light emitter unit (90).

An eighth aspect of the present disclosure provides the impact tool (1) according to any one of the second to seventh aspects in whichthe radial elastic member (92B) includes a front support (92C) supporting the light emitter unit (90) from front.

A ninth aspect of the present disclosure provides the impact tool (1) according to the eighth aspect in whichthe front support (92C) is in contact with a front surface of the light emitter unit (90).

A tenth aspect of the present disclosure provides the impact tool (1) according to the eighth aspect or the ninth aspect, further comprising:a fastener (93,94) fastened to at least a part of the hammer case (6) and supporting the front support (92C) from front.

An eleventh aspect of the present disclosure provides the impact tool (1) according to any one of the first to tenth aspects in whichthe radial elastic member (92) surrounds the anvil (16).

A twelfth aspect of the present disclosure provides the impact tool (1) according to any one of the first to eleventh aspects, further comprising:an axial elastic member (91) supporting the light emitter unit (90) from rear.

A thirteenth aspect of the present disclosure provides the impact tool (1) according to the twelfth aspect in whichthe hammer case (6) includesa first cylinder (61) surrounding the hammer (71),a second cylinder (62) located frontward from the first cylinder (61) and having a smaller outer diameter than the first cylinder (61), anda front wall (63) connecting a front end of the first cylinder (61) and a rear end of the second cylinder (62), andthe axial elastic member (91) includes an axial base (91A) between the front wall (63) and the light emitter unit (90) in an axial direction.

A fourteenth aspect of the present disclosure provides the impact tool (1) according to the thirteenth aspect in whichthe axial base (91A) includesa rear surface facing a front surface of the front wall (63), anda second axial rib (91D) protruding rearward from the rear surface, the second axial rib (91D) being in contact with a front surface of the front wall (63).

A fifteenth aspect of the present disclosure provides the impact tool (1) according to the thirteenth aspect or the fourteenth aspect in whichthe axial base (91A) is in contact with a rear surface of the light emitter unit (90).

A sixteenth aspect of the present disclosure provides the impact tool (1) according to any one of the twelfth to fifteenth aspects in whichthe axial elastic member (91) includes a cover (91B) covering the light emitter unit (90) from radially outside.

A seventeenth aspect of the present disclosure provides the impact tool (1) according to the sixteenth aspect in whichthe cover (91B) is in contact with an outer circumferential surface of the light emitter unit (90).

An eighteenth aspect of the present disclosure provides impact tool (1), comprising:a motor (10);a hammer (71) rotatable by the motor (10);an anvil (16) strikable by the hammer (71) in a rotation direction;a hammer case (6) accommodating the hammer (71);a light emitter unit (90) including a light emitter (95B) configured to illuminate a front end of the anvil (16) and an area adjacent to the front end of the anvil (16); andan axial elastic member (91) supported by the hammer case (6), the elastic member (91) including an axial base (91A) and a cover (91B), the axial base (91A) supporting the light emitter unit (90) from rear, the cover (91B) covering the light emitter unit (90) from radially outside.

A nineteenth aspect of the present disclosure provides the impact tool (1) according to the eighteenth aspect in whichthe cover (91B) has a radial dimension (Db) smaller than an axial dimension (Da) of the axial base (91A).

A twentieth aspect of the present disclosure provides an impact tool (1), comprising:a motor (10);a hammer (71) rotatable by the motor (10);an anvil (16) strikable by the hammer (71) in a rotation direction;a hammer case (6) accommodating the hammer (71);a light emitter unit (90) including a light emitter (95B) configured to illuminate a front end of the anvil (16) and an area adjacent to the front end of the anvil (16);an elastic member (92) supported by the hammer case (6), the elastic member (92) including a front support (92C) supporting the light emitter unit (90) from front; anda fastener (93,94) fastened to at least a part of the hammer case (6) and supporting the front support (92C) from front.

A twenty-first aspect of the present disclosure provides an impact tool (1), comprising:a motor (10);a hammer (71) rotatable by the motor (10);an anvil (16) strikable by the hammer (71) in a rotation direction;a hammer case (6) accommodating the hammer (71);a light emitter unit (90) including a light emitter (95B) configured to illuminate a front end of the anvil (16) and an area adjacent to the front end of the anvil (16); andan elastic member (91,92) supported by the hammer case (6) and supporting the light emitter unit (90) from at least three of radially inside, radially outside, rear, or front.

A twenty-second aspect of the present disclosure provides the impact tool (1) according to the twenty-first aspect in whichthe hammer case (6) includesa first cylinder (61) surrounding the hammer (71),a second cylinder (62) located frontward from the first cylinder (61) and having a smaller outer diameter than the first cylinder (61), anda front wall (63) connecting a front end of the first cylinder (61) and a rear end of the second cylinder (62), andthe elastic member (91,92) and the light emitter unit (90) are located radially inward from a line (VL) connecting the front end of the first cylinder (61) and a front end of the anvil (16) in a cross section including a rotation axis (AX) of the anvil (16) and parallel to the rotation axis (AX).

A twenty-third aspect of the present disclosure provides the impact tool (1) according to any one of the first to twenty-second aspects in whichthe light emitter unit (90) includes a chip-on-board light-emitting diode (95).

A twenty-fourth aspect of the present disclosure provides the impact tool (1) according to the twenty-third aspect in whichthe light emitter unit (90) includes an optical member (96) facing a front surface of the light emitter (95B), and the optical member (96) transmits light emitted from the light emitter (95B).

A twenty-fifth aspect of the present disclosure provides the impact tool (1) according to the twenty-fourth aspect in whichthe optical member (96) and a substrate in the chip-on-board light-emitting diode (95) are fastened together with a fastener (96G).

A twenty-sixth aspect of the present disclosure provides the impact tool (1) according to the twenty-fifth aspect in whichthe fastener (96G) includes a snap-fit (96G) included in the optical member (96).

A twenty-seventh aspect of the present disclosure provides an impact tool (1B), comprising:a motor (10);an output unit (16) located frontward from the motor (10), the output unit (16) being rotatable about an output rotation axis (AX) extending in a front-rear direction with a rotational force from the motor (10);a bearing (79) supporting the output unit (16) in a rotatable manner;a case (6) holding the bearing (79);a light assembly (18B) surrounding the case (6); anda front bumper (120) located frontward from the light assembly (18B) and covering at least a part of a surface of the case (6), the front bumper (120) comprising rubber and being in contact with at least a part of a front surface of the light assembly (18B).

A twenty-eighth aspect of the present disclosure provides the impact tool (1B) according to the twenty-seventh aspect in whichthe front bumper (120) includesa cylindrical portion (121) surrounding the case (6), anda protrusion (123) protruding radially inward from an inner circumferential surface of the cylindrical portion (121), the protrusion (123) being received in a groove (62R) on an outer circumferential surface of the case (6).

A twenty-ninth aspect of the present disclosure provides the impact tool (1B) according to the twenty-seventh aspect in whichthe light assembly (18B) includesa light emitter unit (300) surrounding the case (6) and including a light emitter (95), anda radial elastic member (302) supported by the case (6) and supporting the light emitter unit (300) from radially inside, andthe front bumper (120) is in contact with at least a part of a front surface of the radial elastic member (302).

A thirtieth aspect of the present disclosure provides the impact tool (1B) according to the twenty-ninth aspect in whichthe light emitter unit (300) includes an optical member (960) facing a front surface of the light emitter (95), and the optical member (960) transmitting light emitted from the light emitter (95),the radial elastic member (302) at least partially faces a front surface of the optical member (960), andthe front bumper (120) supports the optical member (960) from front with the radial elastic member (302) in between.

A thirty-first aspect of the present disclosure provides the impact tool (1B) according to the thirtieth aspect in whichthe front bumper (120) has an outer end located radially outward from an inner end of the optical member (960).

A thirty-second aspect of the present disclosure provides the impact tool (1B) according to the thirty-first aspect in whichthe light assembly (18B) includes an axial elastic member (301) supporting the light emitter unit (300) from rear.

A thirty-third aspect of the present disclosure provides the impact tool (1B) according to the thirty-second aspect in whichthe case (6) includesa front cylinder (62) holding the bearing (79),a rear cylinder (61) located rearward from the front cylinder (62) and having a larger outer diameter than the front cylinder (62),a front wall (63) connecting a front end of the rear cylinder (61) and a rear end of the front cylinder (62), andan annular rib (64) protruding frontward from an outer edge of a front surface of the front wall (63), andthe axial elastic member (301) is at least partially between the annular rib (64) and the light emitter unit (300) in a radial direction.

A thirty-fourth aspect of the present disclosure provides the impact tool (1B) according to the thirty-third aspect, further comprising:a rear bumper (110) comprising rubber and covering an outer circumferential surface of the rear cylinder (61) and an outer circumferential surface of the annular rib (64).

A thirty-fifth aspect of the present disclosure provides the impact tool (1B) according to the thirty-fourth aspect in whicheach of the radial elastic member (302) and the axial elastic member (301) comprises rubber, andeach of the front bumper (120) and the rear bumper (110) has a higher rubber hardness than the radial elastic member (302) or the axial elastic member (301).

A thirty-sixth aspect of the present disclosure provides the impact tool (1B) according to the thirty-fourth aspect in whichthe rear bumper (110) has a front end located rearward from a rear end of the optical member (960).

A thirty-seventh aspect of the present disclosure provides the impact tool (1B) according to the thirty-fourth aspect in whichthe rear bumper (110) has a front end overlapping a rear end of the axial elastic member (301) in a radial direction.

A thirty-eighth aspect of the present disclosure provides the impact tool (1B) according to the twenty-seventh aspect, further comprising:a main housing (2) includinga body (21) accommodating the motor (10),a protruding portion (22) protruding downward from the body (21),a controller compartment (24) behind the protruding portion (22), anda grip (23) behind the body (21), the grip (23) includinga rear grip (23A) extending upward from a rear portion of the controller compartment (24), andan upper grip (23B) extending frontward from an upper end of the rear grip (23A), the rear grip (23A) having a lower end connected to the controller compartment (24) and an upper end connected to a rear end of the upper grip (23B), the upper grip (23B) having a front end connected to an upper portion of the body (21).

A thirty-ninth aspect of the present disclosure provides the impact tool (1F) according to the twenty-seventh aspect, further comprising:a main housing (202) includinga body (221) accommodating the motor (10),a grip (222) protruding downward from the body (221), anda battery holding portion (223) connected to a lower end of the grip (222).

Although one or more embodiments of the present disclosure will now be described with reference to the drawings, the present disclosure is not limited to the present embodiments. The components in the embodiments described below may be combined as appropriate. One or more components may be eliminated.

In the embodiments, the positional relationships between the components will be described using the directional terms such as right and left (or lateral), front and rear (or frontward and rearward), and up and down (or vertical). The terms indicate relative positions or directions with respect to the center of an impact tool1. The lateral direction, the front-rear direction, and the vertical direction are orthogonal to one another.

The impact tool1includes a motor10and an anvil16that is an output unit of the impact tool1. The rotation axis of the motor10is referred to as a motor rotation axis MX for convenience. The rotation axis of the anvil16is referred to as an output rotation axis AX for convenience. The motor rotation axis MX extends vertically. The output rotation axis AX extends in the front-rear direction.

A direction parallel to the output rotation axis AX is referred to as an axial direction or axially for convenience. A direction about the output rotation axis AX is referred to as a circumferential direction or circumferentially, or a rotation direction for convenience. A direction radial from the output rotation axis AX is referred to as a radial direction or radially for convenience. A position nearer the output rotation axis AX in the radial direction, or a radial direction toward the output rotation axis AX, is referred to as radially inside or radially inward for convenience. A position farther from the output rotation axis AX in the radial direction, or a radial direction away from the output rotation axis AX, is referred to as radially outside or radially outward for convenience.

First Embodiment

Impact Tool

FIG.1is a perspective view of the impact tool1according to the present embodiment as viewed from the left front.FIG.2is a perspective view of the impact tool1as viewed from the right rear.FIG.3is a right side view of the impact tool1.FIG.4is a left side view of the impact tool1.FIG.5is a rear view of the impact tool1.FIG.6is a front view of the impact tool1.FIG.7is a top view of the impact tool1.FIG.8is a bottom view of the impact tool1.FIG.9is a sectional view of the impact tool1taken along line B-B inFIG.7as viewed in the direction indicated by the arrows.FIG.10is a sectional view of the impact tool1taken along line A-A inFIG.3as viewed in the direction indicated by the arrows.FIG.11is a partial sectional view of the impact tool1, corresponding to a partially enlarged view ofFIG.9.FIG.12is a partial sectional view of the impact tool1, corresponding to a partially enlarged view ofFIG.10.

The impact tool1is an example of a power tool including an electric motor10as a driving source. The impact tool1according to the embodiment is an impact wrench as an example of a fastening tool. The impact tool1includes a main housing2, a battery housing3, a motor case4, a gear case5, a hammer case6, a side handle7, a bumper8, a battery holder9, the motor10, a controller11, a fan12, a reducer13, a spindle14, a striker15, the anvil16, a trigger switch17, a light assembly18, an interface panel19, and a hook assembly20.

The main housing2accommodates the motor case4. The main housing2accommodates a part of the gear case5. The main housing2is connected to the battery housing3. The main housing2is fixed to the hammer case6.

The main housing2is formed from a synthetic resin. The main housing2is formed from, for example, a nylon resin. The main housing2includes a left main housing2L and a right main housing2R. The right main housing2R is on the right of the left main housing2L. The left main housing2L and the right main housing2R form a pair of housing halves. The left main housing2L and the right main housing2R are fastened together with multiple screws2S.

The main housing2includes a body21, a protruding portion22, a grip23, a controller compartment24, and a panel holder25.

The body21accommodates the motor case4. The body21accommodates a part of the gear case5.

The protruding portion22protrudes downward from the body21. The protruding portion22is located in front of the battery housing3.

The grip23is grippable by an operator. The grip23is located behind the body21. The grip23includes a rear grip23A and an upper grip23B. The rear grip23A extends upward from a rear portion of the controller compartment24. The upper grip23B extends frontward from the upper end of the rear grip23A. The rear grip23A has its lower end connected to the controller compartment24. The rear grip23A has its upper end connected to the rear end of the upper grip23B. The upper grip23B has its front end connected to an upper portion of the body21. The grip23, the body21, and the controller compartment24define a D-shaped handle. The D-shaped handle is located behind the motor10. The trigger switch17is located in an upper portion of the rear grip23A.

The controller compartment24accommodates the controller11.

The panel holder25holds the interface panel19.

The battery housing3supports the battery holder9. The battery housing3is movable relative to the main housing2and connected to the main housing2. The battery housing3is formed from a synthetic resin. The battery housing3is formed from, for example, a nylon resin.

The battery housing3is located below the controller compartment24. The battery housing3is located behind the protruding portion22. The battery housing3is connected to the D-shaped handle.

The battery housing3includes a left battery housing3L and a right battery housing3R. The right battery housing3R is on the right of the left battery housing3L. The left battery housing3L and the right battery housing3R form a pair of housing halves. The left battery housing3L and the right battery housing3R are fastened together with multiple screws3S. The battery holder9is held between the left battery housing3L and the right battery housing3R.

The motor case4accommodates the motor10. The motor case4is located below the gear case5. The motor case4is fastened to the gear case5.

The motor case4is formed from a synthetic resin. The motor case4is formed from, for example, a polycarbonate resin.

The motor case4includes a cylinder4A and a lower wall4B. The cylinder4A surrounds the motor10. The lower wall4B is at the lower end of the cylinder4A.

The gear case5accommodates at least a part of the reducer13. The gear case5is located behind the hammer case6. The gear case5is fastened to the hammer case6.

The gear case5is formed from a metal. The gear case5is formed from, for example, aluminum or magnesium.

The gear case5is substantially cylindrical. The gear case5has an opening in its front portion. The gear case5has an opening in its rear portion. The gear case5has an opening in its lower portion. A bearing cover40is received in the rear opening of the gear case5. The bearing cover40is fastened to the rear portion of the gear case5with screws40S.

The hammer case6accommodates the striker15including a hammer71. The hammer case6is connected to a front portion of the main housing2. The hammer case6is connected to the front portion of the gear case5.

The hammer case6is formed from a metal. The hammer case6is formed from, for example, aluminum.

The hammer case6is substantially cylindrical. The hammer case6includes a first cylinder61, a second cylinder62, and a front wall63. The first cylinder61surrounds the striker15including the hammer71. The second cylinder62is located frontward from the first cylinder61. The second cylinder62has a smaller outer diameter than the first cylinder61. The gear case5has its front end received in an opening in the rear end of the first cylinder61. The front wall63connects the front end of the first cylinder61and the rear end of the second cylinder62.

The main housing2, the gear case5, and the hammer case6are fastened together with multiple screws41. The main housing2includes multiple screw bosses2B. The gear case5includes multiple screw bosses5B. The hammer case6includes multiple screw bosses6B. The screws41are placed in through-holes in the screw bosses2B and through-holes in the screw bosses5B. The screws41are placed in threaded holes in the screw bosses6B. The screws41are placed into the through-holes in the screw bosses2B and the through-holes in the screw bosses5B from the rear of the screw bosses2B, and then into the threaded holes in the screw bosses6B.

The motor case4has an opening in its upper portion. The gear case5has the opening in its lower portion. The motor case4has an internal space connecting with the internal space of the gear case5through the upper opening of the motor case4and the lower opening of the gear case5. The motor case4and the gear case5are fastened together with multiple screws (not shown).

The gear case5has the opening in its front portion. The hammer case6has an opening in its rear portion. The gear case5has the internal space connecting with the internal space of the hammer case6through the front opening of the gear case5and the rear opening of the hammer case6.

The side handle7is grippable by the operator. The side handle7includes a handle portion7A and a base7B. The handle portion7A is grippable by the operator. The base7B is fastened to the hammer case6. The handle portion7A is located on the left of the hammer case6. The base7B includes a first base7C and a second base7D. The second base7D is located below the first base7C. The first base7C and the second base7D are arc-shaped. The first base7C and the second base7D hold the first cylinder61in the hammer case6in between. The first base7C and the second base7D have their right ends connected to each other with a hinge7E. The first base7C and the second base7D have their left ends connected to the handle portion7A.

The left end of the first base7C is joined to the left end of the second base7D with a fastening assembly42. The fastening assembly42includes a screw42A and a dial42B. The screw42A is received in a threaded hole in the left end of the second base7D. The dial42B is rotatable relative to the screw42A. The operator operates the dial42B to rotate the dial42B. This adjusts the distance between the left end of the first base7C and the left end of the second base7D. As the screw42A is rotated to shorten the distance between the left end of the first base7C and the left end of the second base7D, the base7B tightly holds the hammer case6, fastening the side handle7to the hammer case6.

Although the handle portion7A in the embodiment is located on the left of the hammer case6, the handle portion7A may be at any position around the hammer case6. The handle portion7A may be located on, for example, the right of, above, or below the hammer case6. The position (angle) of the handle portion7A with respect to the hammer case6is adjustable by up to 360 degrees.

The bumper8covers at least a part of the surface of the hammer case6. The bumper8in the embodiment covers the surface of the first cylinder61. The bumper8protects the hammer case6. The bumper8reduces contact between the hammer case6and objects around the impact tool1. The bumper8is formed from an elastic material that is more flexible than the material for the hammer case6. The bumper8is formed from, for example, styrene butadiene rubber.

The battery holder9holds a battery pack43in a detachable manner. The controller compartment24is located above the battery pack43attached to the battery holder9. The protruding portion22is located in front of the battery pack43attached to the battery holder9. The battery pack43functions as a power supply for the impact tool1. The battery pack43includes a secondary battery. The battery pack43in the embodiment includes a rechargeable lithium-ion battery. The battery pack43is attached to the battery holder9to power the impact tool1. The motor10is driven by power supplied from the battery pack43. The controller11operates with power supplied from the battery pack43.

The battery holder9holds a plate-like terminal unit44. The terminal unit44includes a synthetic resin plate and terminals. The terminals are metal connection terminals on the plate. When the battery holder9receives the battery pack43, the terminals in the terminal unit44are connected to battery terminals that are connection terminals in the battery pack43.

The battery housing3holds a spring45and a rubber buffer46. The spring45is located in front of the battery holder9. The rubber buffer46is located in front of the battery pack43held by the battery holder9. The spring45urges the battery holder9backward. The rubber buffer46is located frontward from the battery pack43attached to the battery holder9. The rubber buffer46can come in contact with the front of the battery pack43. When, for example, the impact tool1is dropped, an elastic force from the spring45reduces a shock to the terminal unit44, and the rubber buffer46reduces a shock to the battery pack43.

The motor10functions as a power source for the impact tool1. The motor10is an inner-rotor direct-current (DC) brushless motor. The motor10includes a stator47, a rotor48, and a rotor shaft49. The stator47is supported by the motor case4. The rotor48is at least partially located inward from the stator47. The rotor shaft49is fixed to the rotor48. The rotor48is rotatable relative to the stator47about the motor rotation axis MX extending vertically.

The stator47includes a stator core including multiple teeth and multiple coils. Each coil is wound around the corresponding tooth with an insulator in between. The coils are connected to one another with a busbar unit.

The rotor48rotates about the motor rotation axis MX. The rotor48includes a rotor core and a rotor magnet fixed to the rotor core.

A sensor board50is fixed to the insulator in the stator47. The sensor board50detects the position of the rotor48in the rotation direction. The sensor board50includes a rotation detector supported on an annular circuit board. The rotation detector detects the position of the rotor magnet in the rotor48to detect the position of the rotor48in the rotation direction.

The rotor shaft49is fixed to the rotor core in the rotor48. The rotor48and the rotor shaft49rotate together about the motor rotation axis MX.

The rotor shaft49is rotatably supported by a rotor bearing51and a rotor bearing52. The rotor bearing51supports an upper portion of the rotor shaft49in a rotatable manner. The upper portion of the rotor shaft49protrudes upward from the upper end face of the rotor48. The rotor bearing52supports a lower portion of the rotor shaft49in a rotatable manner. The lower portion of the rotor shaft49protrudes downward from the lower end face of the rotor48. The rotor bearing51is held by the gear case5. The rotor bearing52is held by the motor case4.

A first bevel gear53is fixed to the upper end of the rotor shaft49. The first bevel gear53is connected to at least a part of the reducer13. The rotor shaft49is connected to the reducer13with the first bevel gear53.

The controller11outputs control signals for controlling the motor10. The controller11includes a circuit board on which multiple electronic components are mounted. Examples of the electronic components mounted on the circuit board include a processor such as a central processing unit (CPU), a nonvolatile memory such as a read-only memory (ROM) or a storage device, a volatile memory such as a random-access memory (RAM), a field-effect transistor (FET), and a resistor.

The controller11is accommodated in the controller compartment24. The controller11is held by a controller case11A in the controller compartment24.

The fan12generates an airflow for cooling the motor10and the controller11. The fan12is located above the stator47. The fan12is fixed to the upper portion of the rotor shaft49. The fan12is located between the rotor bearing51and the stator47. The fan12and the rotor shaft49rotate together.

The controller compartment24has inlets26. The body21has outlets27in its upper portion. The motor case4has a vent4C in its rear portion. As the fan12rotates, air outside the main housing2flows into the internal space of the controller compartment24through the inlets26to cool the controller11. As the fan12rotates, the air passing through the internal space of the controller compartment24flows into the internal space of the motor case4through the vent4C to cool the motor10. As the fan12rotates, at least a part of the air passing through the internal space of the motor case4flows out of the motor case4through the outlets27.

The reducer13transmits a rotational force from the motor10to the striker15through the spindle14. The reducer13connects the rotor shaft49and the spindle14together. The reducer13rotates the spindle14at a lower rotational speed than the rotor shaft49.

The reducer13includes a second bevel gear54and a planetary gear assembly55. The second bevel gear54meshes with the first bevel gear53. The planetary gear assembly55is driven with a rotational force from the motor10transmitted through the second bevel gear54.

The planetary gear assembly55includes a sun gear55S, multiple planetary gears55P, and an internal gear55I. The planetary gears55P surround the sun gear55S. The internal gear55I surrounds the planetary gears55P. The planetary gear assembly55is accommodated in the gear case5.

The second bevel gear54surrounds the sun gear55S. The second bevel gear54is fixed to the sun gear55S. The second bevel gear54and the sun gear55S rotate together. The second bevel gear54and the sun gear55S are rotatable about the output rotation axis AX extending in the front-rear direction. The output rotation axis AX is orthogonal to the motor rotation axis MX. The sun gear55S has its rear end supported by a gear bearing56. The sun gear55S has its middle portion supported by a gear bearing57. The gear bearing56is held by the bearing cover40. The gear bearing57is held by the gear case5. As the rotor shaft49rotates to rotate the first bevel gear53, the second bevel gear54rotates. This rotates the sun gear55S.

Each planetary gear55P meshes with the sun gear55S. The planetary gears55P are rotatably supported by the spindle14with a pin55A. The spindle14is rotated by the planetary gears55P. The internal gear55I includes internal teeth that mesh with the planetary gears55P. The internal gear55I is fixed to the gear case5. The internal gear55I includes multiple protrusions on its outer circumferential surface. The protrusions on the internal gear55I are fitted in recesses on the inner circumferential surface of the gear case5. The internal gear55I is constantly nonrotatable relative to the gear case5.

When the rotor shaft49and the first bevel gear53rotate as driven by the motor10, the second bevel gear54and the sun gear55S rotate. As the sun gear55S rotates, the planetary gears55P revolve about the sun gear55S. The planetary gears55P revolve while meshing with the internal teeth on the internal gear55I. The revolving planetary gears55P rotate the spindle14connected to the planetary gears55P with the pin55A at a lower rotational speed than the rotor shaft49.

The spindle14rotates with a rotational force from the motor10transmitted by the reducer13. The spindle14transmits the rotational force from the motor10transmitted through the reducer13to the striker15. The spindle14is rotatable about the output rotation axis AX. The spindle14has a rear portion accommodated in the gear case5. The spindle14has a front portion accommodated in the hammer case6. The spindle14is at least partially located in front of the reducer13. The spindle14is located behind the anvil16.

The spindle14includes a flange14A, a spindle shaft14B, and a protruding portion14C. The spindle shaft14B protrudes frontward from the flange14A. The protruding portion14C protrudes rearward from the flange14A.

The planetary gears55P are rotatably supported by the flange14A and the protruding portion14C with the pin55A. The spindle14is rotatably supported by a spindle bearing58. The spindle bearing58supports the protruding portion14C in a rotatable manner. The spindle bearing58is held by the gear case5.

The striker15strikes the anvil16in the rotation direction about the output rotation axis AX. The striker15is located in front of the motor10. The striker15is driven by the motor10. The striker15is rotatable about the output rotation axis AX. A rotational force from the motor10is transmitted to the striker15through the reducer13and the spindle14. The striker15strikes the anvil16in the rotation direction with a rotational force of the spindle14rotated by the motor10.

The striker15is accommodated in the first cylinder61in the hammer case6. The striker15includes the hammer71, balls72, a first coil spring73, a second coil spring74, a third coil spring75, a first washer76, and a second washer77.

The hammer71is located in front of the reducer13. The hammer71surrounds the spindle shaft14B. The hammer71is held by the spindle shaft14B. The hammer71is rotated by the motor10. The balls72are located between the spindle shaft14B and the hammer71. The hammer71includes a cylindrical hammer body71A and hammer projections71B. The hammer projections71B are located at the front of the hammer body71A. The hammer body71A has an annular recess71C on its rear surface. The recess71C is recessed frontward from the rear surface of the hammer body71A.

The hammer71is rotated by the motor10. A rotational force from the motor10is transmitted to the hammer71through the reducer13and the spindle14. The hammer71is rotatable together with the spindle14with a rotational force of the spindle14rotated by the motor10. The hammer71and the spindle14rotate about the output rotation axis AX.

The first washer76is received in the recess71C. The first washer76is supported by the hammer71with multiple balls78in between. The balls78are located in front of the first washer76.

The second washer77is located behind the first washer76inside the recess71C. The second washer77has a smaller outer diameter than the first washer76. The second washer77and the hammer71are movable relative to each other in the front-rear direction.

The first coil spring73surrounds the spindle shaft14B. The first coil spring73has its rear end supported by the flange14A. The first coil spring73has its front end received in the recess71C and supported by the first washer76. The first coil spring73constantly generates an elastic force for moving the hammer71forward.

The second coil spring74surrounds the spindle shaft14B. The second coil spring74is located radially inward from the first coil spring73. The second coil spring74has its rear end supported by the flange14A. The second coil spring74has its front end received in the recess71C and supported by the second washer77. The second coil spring74generates an elastic force for moving the hammer71forward when the hammer71moves backward.

The third coil spring75surrounds the spindle shaft14B. The third coil spring75is located radially inward from the first coil spring73. The third coil spring75is received in the recess71C. The third coil spring75has its rear end supported by the second washer77. The third coil spring75has its front end supported by the first washer76. The third coil spring75generates an elastic force for moving the second coil spring74backward. The rear end of the second coil spring74is pressed against the flange14A with the elastic force from the third coil spring75. This restricts free movement of the second coil spring74relative to the flange14A.

The balls72are formed from a metal such as steel. The balls72are located between the spindle shaft14B and the hammer71. The spindle14has a spindle groove14D. The spindle groove14D receives at least parts of the balls72. The spindle groove14D is on the outer surface of the spindle shaft14B. The hammer71has a hammer groove71D. The hammer groove71D receives at least parts of the balls72. The hammer groove71D is on the inner surface of the hammer71. The balls72are located between the spindle groove14D and the hammer groove71D. The balls72roll along the spindle groove14D and the hammer groove71D. The hammer71is movable together with the balls72. The spindle14and the hammer71are movable relative to each other in a direction parallel to the output rotation axis AX and in the rotation direction about the output rotation axis AX within a movable range defined by the spindle groove14D and the hammer groove71D.

The anvil16is an output unit of the impact tool1that rotates with a rotational force from the motor10. The anvil16is at least partially located in front of the hammer71. The anvil16is struck by the hammer71in the striker15in the rotation direction.

The anvil16has an anvil recess16A on its rear end. The anvil recess16A is recessed frontward from the rear end of the anvil16. The spindle14is located behind the anvil16. The spindle shaft14B has its front end received in the anvil recess16A.

The anvil16includes an anvil shaft16B and anvil projections16C. The anvil shaft16B is located in front of the striker15. The anvil projections16C protrude radially outward from the rear end of the anvil shaft16B. The anvil projections16C are struck by the striker15in the rotation direction about the output rotation axis AX.

The anvil shaft16B has its front end located in front of the hammer case6through a front opening of the second cylinder62. The anvil shaft16B receives a socket as a tip tool on the front end.

The anvil16is rotatably supported by an anvil bearing79. The anvil bearing79surrounds the anvil shaft16B. The anvil16is rotatable about the output rotation axis AX. The anvil bearing79is held by the hammer case6. The anvil bearing79is located inward from the second cylinder62in the hammer case6. The anvil bearing79is held by the second cylinder62in the hammer case6.

The anvil bearing79in the embodiment is a slide bearing. The anvil bearing79is cylindrical. The anvil bearing79in the embodiment is a sleeve. For example, a cylindrical porous metal member manufactured by powder metallurgy may be impregnated with a lubricant oil to form the slide bearing.

The anvil shaft16B has an outer circumferential surface that is circular in a cross section orthogonal to the output rotation axis AX. The anvil bearing79has an inner circumferential surface that is circular in a cross section orthogonal to the output rotation axis AX.

The anvil shaft16B has a first groove16D on its outer circumferential surface. The first groove16D surrounds the output rotation axis AX.

The anvil bearing79has a groove79A on its inner circumferential surface. The groove79A surrounds the output rotation axis AX.

An O-ring80is located between the first groove16D and the groove79A. The O-ring80reduces the likelihood of the anvil shaft16B slipping forward from the hammer case6. The O-ring80is in contact with the inner surfaces of the first groove16D and the groove79A. The O-ring80is slightly compressed by the inner surfaces of the first groove16D and the groove79A. The O-ring80seals the boundary between the anvil shaft16B and the anvil bearing79.

The hammer case6has a bearing support surface6A. The bearing support surface6A is in contact with the front end of the anvil bearing79. The bearing support surface6A is on a front end portion of the second cylinder62. The bearing support surface6A faces rearward. The bearing support surface6A presses the anvil bearing79from the front. The bearing support surface6A reduces the likelihood of the anvil bearing79slipping forward from the hammer case6. The bearing support surface6A is annular in a plane orthogonal to the output rotation axis AX. The opening in the front end portion of the second cylinder62is located radially inward from the bearing support surface6A.

The anvil shaft16B has its front end located frontward from the second cylinder62through the opening in the front end portion of the second cylinder62. The anvil shaft16B is at least partially located in the opening in the front end portion of the second cylinder62. The second cylinder62receives a seal81on the front end portion. The seal81is located inward from the front end portion of the second cylinder62. The seal81seals the boundary between the front end portion of the second cylinder62and the anvil shaft16B. The seal81is located frontward from the O-ring80.

The anvil shaft16B has a second groove16E. The second groove16E is located rearward from the first groove16D. The anvil shaft16B has a smaller section modulus at the second groove16E than at the first groove16D. More specifically, the anvil shaft16B has a smaller section modulus at a cross section of the anvil shaft16B cut along the second groove16E and orthogonal to the output rotation axis AX than at a cross section of the anvil shaft16B cut along the first groove16D and orthogonal to the output rotation axis AX. The anvil shaft16B has the smallest bending moment at the second groove16E. In other words, the anvil shaft16B is breakable most easily at the second groove16E when receiving a high load.

The second groove16E is located on the outer circumferential surface of the anvil shaft16B. The second groove16E is located rearward from the first groove16D. The second groove16E surrounds the output rotation axis AX.

The second groove16E is deeper than the first groove16D. The depth of the second groove16E refers to the radial dimension of the second groove16E.

When receiving a high load during a fastening operation, for example, the anvil shaft16B may be at least partially broken. In the embodiment, the anvil shaft16B has the second groove16E. The anvil shaft16B may thus break at the second groove16E when receiving a high load.

When the anvil shaft16B breaks at the second groove16E, a portion of the anvil shaft16B frontward from the second groove16E may move forward relative to the hammer case6. In this case, at least a part of the inner surface of the first groove16D and at least a part of the inner surface of the groove79A are caught on the O-ring80.

The anvil bearing79has its front end in contact with the bearing support surface6A of the hammer case6. When the anvil shaft16B breaks, the anvil bearing79does not move forward relative to the hammer case6. The O-ring80is caught on at least a part of the inner surface of the first groove16D and at least a part of the inner surface of the groove79A. The O-ring80also does not move forward relative to the hammer case6. The anvil shaft16B is caught on the O-ring80that does not move forward relative to the hammer case6. This reduces the likelihood of the anvil shaft16B slipping forward from the hammer case6when the anvil shaft16B breaks at the second groove16E. More specifically, this reduces the likelihood of the portion of the anvil shaft16B frontward from the second groove16E slipping forward from the impact tool1when the anvil shaft16B breaks.

The trigger switch17is operable by the operator to drive the motor10. The motor10being driven refers to the rotor48being rotated when the coils in the stator47are energized. The trigger switch17is located in the upper portion of the rear grip23A. The trigger switch17includes a trigger lever17A and a switch body17B. The switch body17B is located in the internal space of the rear grip23A. The trigger lever17A protrudes frontward from an upper front portion of the rear grip23A. The trigger lever17A is operable by the operator to move backward. This drives the motor10. The trigger lever17A is released from operation to stop the motor10.

The light assembly18emits illumination light. The light assembly18illuminates the anvil16and an area around the anvil16with illumination light. The light assembly18illuminates an area ahead of the anvil16with illumination light. The light assembly18also illuminates the socket attached to the anvil16and an area around the socket with illumination light. The light assembly18surrounds the second cylinder62in the hammer case6.

The interface panel19includes, for example, an operation button for selecting the light emission mode of the light assembly18. The interface panel19includes, for example, a display that displays the remaining battery level of the battery pack43.

The hook assembly20is hooked on an object. The hook assembly20includes a base20A and a ring20B. The base20A is fastened to an upper portion of the main housing2. The base20A in the embodiment has through-holes to receive the screws41. The screws41are placed in the through-holes in the screw bosses2B through the through-holes in the base20A. The base20A is held between the heads of the screws41and the screw bosses2B and is thus fastened to the upper portion of the main housing2. The ring20B protrudes upward from the base20A. At least a part of the object may be placed through the ring20B. This causes the impact tool1to be suspended from the object with the hook assembly20.

Light Assembly

FIG.13is an exploded perspective view of the light assembly18in the embodiment as viewed from the right front.FIG.14is an exploded perspective view of the light assembly18as viewed from the left rear.FIG.15is a perspective view of an axial elastic member as viewed from the right front.FIG.16is a perspective view of the axial elastic member as viewed from the left rear.FIG.17is a perspective view of a light emitter unit as viewed from the right front.FIG.18is a perspective view of the light emitter unit as viewed from the left rear.FIG.19is a perspective view of a radial elastic member as viewed from the right front.FIG.20is a perspective view of the radial elastic member as viewed from the left rear.FIG.21is a partially enlarged sectional view of the light assembly18.

The light assembly18includes a light emitter unit90, an axial elastic member91, a radial elastic member92, a washer93, and a ring spring94.

The COB LED95includes a substrate95A, LED chips95B as light emitters, banks95C, and a phosphor95D.

The light emitter unit90including the LED chips95B illuminates the front end of the anvil16and an area adjacent to the anvil16. The light emitter unit90at least partially surrounds the second cylinder62.

The substrate95A is annular. The substrate95A is located around the anvil shaft16B with the second cylinder62in between. The substrate95A surrounds the anvil shaft16B. The substrate95A is, for example, an aluminum substrate, a glass fabric base epoxy resin substrate (flame retardant 4 or FR-4 substrate), or a composite base epoxy resin substrate (composite epoxy material 3 or CEM-3 substrate). The substrate95A in the embodiment has multiple recesses95F on its inner edge. Each recess95F is recessed radially outward from the inner edge of the substrate95A. The multiple (six in the embodiment) recesses95F are arranged at intervals in the circumferential direction of the substrate95A.

The LED chips95B are mounted on the front surface of the substrate95A. The LED chips95B at least partially surround the anvil shaft16B with the second cylinder62in between. The LED chips95B are multiple (36in the embodiment) LED chips95B arranged at intervals in the circumferential direction of the substrate95A. The LED chips95B may be60or72LED chips95B arranged at equal intervals in the circumferential direction of the substrate95A. The LED chips95B are connected to the substrate95A with gold wires (not shown). The gold wires interconnect the multiple LED chips95B.

The banks95C are located on the front surface of the substrate95A. The banks95C protrude frontward from the front surface of the substrate95A. The banks95C define a space for the phosphor95D. The banks95C surround the LED chips95B. One bank95C is located radially inward from the LED chips95B, and the other bank95C is located radially outward from the LED chips95B. The banks95C are annular. The banks95C in the embodiment have a double annular structure. More specifically, the banks95C in the embodiment include a first annular bank95C and a second annular bank95C. The first bank95C is located on the front surface of the substrate95A. The second bank95C is located radially outward from the first bank95C on the front surface of the substrate95A. The first bank95C is located radially inward from the LED chips95B. The second bank95C is located radially outward from the LED chips95B. The LED chips95B are between the first bank95C and the second bank95C.

The phosphor95D is located on the front surface of the substrate95A. The phosphor95D covers the LED chips95B between the banks95C. The phosphor95D is annular. The phosphor95D covers the LED chips95B between the first bank95C and the second bank95C.

A pair of electrodes are located outside the banks95C on the rear surface of the substrate95A. The pair of electrodes include a positive electrode and a negative electrode. A pair of lead wires95E are connected to the substrate95A. The lead wires95E are connected to the electrodes. The pair of lead wires95E are supported on the rear surface of the substrate95A. The electrodes may be located on the front surface of the substrate95A. The lead wires95E may be supported on the front surface of the substrate95A.

A current output from the battery pack43is supplied to the electrodes through the controller11and the lead wires95E. The voltage of the battery pack43is decreased by the controller11and applied to the electrodes. The current supplied to the electrodes is supplied to the LED chips95B through the substrate95A and the gold wires. The LED chips95B emit light with the current supplied from the battery pack43.

The optical member96faces the front surfaces of the LED chips95B. The optical member96transmits light emitted from the LED chips95B. The optical member96is connected to the COB LED95. The optical member96is fixed to the substrate95A. The optical member96is formed from a polycarbonate resin. The optical member96in the embodiment is formed from a polycarbonate resin containing a white diffusion material. The optical member96is milky white. The optical member96has a light transmittance of 40 to 70% inclusive. The milky white optical member96causes the profile of each LED chip95B to be less visible from outside the impact tool1. The impact tool1thus has an improved design.

The optical member96is at least partially located frontward from the COB LED95. The optical member96includes a first outer cylinder96A, a second outer cylinder96B, a first inner cylinder96C, a second inner cylinder96D, a light transmitter96E, a protrusion96F, and snap-fits96G.

The first outer cylinder96A and the second outer cylinder96B are located radially outward from the first inner cylinder96C and the second inner cylinder96D. The first outer cylinder96A and the second outer cylinder96B are located adjacent to the outer circumference of the COB LED95. The first inner cylinder96C and the second inner cylinder96D are located adjacent to the inner circumference of the COB LED95. The COB LED95is located between the first outer cylinder96A as well as the second outer cylinder96B and the first inner cylinder96C as well as the second inner cylinder96D in the radial direction.

The first outer cylinder96A is located radially outward from the substrate95A. The second outer cylinder96B is located frontward from the first outer cylinder96A. The second outer cylinder96B has a smaller inner diameter than the first outer cylinder96A. A step is defined at the boundary between the front end of the first outer cylinder96A and the rear end of the second outer cylinder96B. The substrate95A has the front surface with its outer edge supported on the step defined at the boundary between the front end of the first outer cylinder96A and the rear end of the second outer cylinder96B.

The first inner cylinder96C is located radially inward from the substrate95A. The second inner cylinder96D is located frontward from the first inner cylinder96C. The second inner cylinder96D has a smaller inner diameter than the first inner cylinder96C. A step is defined at the boundary between the front end of the first inner cylinder96C and the rear end of the second inner cylinder96D. The substrate95A has the front surface with its inner edge supported on the step defined at the boundary between the front end of the first inner cylinder96C and the rear end of the second inner cylinder96D.

The light transmitter96E is located frontward from the COB LED95. The light transmitter96E is annular. The light transmitter96E is located frontward from the LED chips95B. The light transmitter96E connects the front end of the second outer cylinder96B and the front end of the second inner cylinder96D. The light transmitter96E faces the front surface of the substrate95A. The light transmitter96E faces the LED chips95B. The light transmitter96E allows light emitted from the LED chips95B to pass through and illuminate an area ahead of the light emitter unit90.

The light transmitter96E has an incident surface and an emission surface. Light from the LED chips95B enters the incident surface. The light through the light transmitter96E is emitted through the emission surface. The front surface of the substrate95A faces the incident surface of the light transmitter96E. The incident surface faces the LED chips95B. The incident surface faces substantially rearward. The emission surface faces substantially frontward.

The protrusion96F is located inward from the light transmitter96E. The protrusion96F protrudes frontward from the second inner cylinder96D. The protrusion96F is located frontward from the emission surface of the light transmitter96E. The protrusion96F is annular.

The substrate95A has the rear surface located frontward from the rear ends of the first outer cylinder96A and the first inner cylinder96C. The optical member96and the substrate95A in the COB LED95are fastened together with fasteners. The fasteners include the snap-fits96G in the optical member96. Each snap-fit96G is located circumferentially inward from the incident surface of the light transmitter96E and protrudes rearward. The snap-fits96G are multiple (six in the present embodiment) snap-fits96G arranged at intervals in the circumferential direction of the optical member96. The snap-fits96G are received in the respective six recesses95F. The optical member96and the substrate95A in the COB LED95are thus fastened together.

The axial elastic member91and the radial elastic member92are formed from rubber. The axial elastic member91and the radial elastic member92reduce transmission of vibrations from the hammer case6to the light emitter unit90. The axial elastic member91and the radial elastic member92each function as a vibration isolator to reduce vibrations received by the light emitter unit90.

The radial elastic member92is annular. The radial elastic member92surrounds the anvil shaft16B. The radial elastic member92surrounds the second cylinder62.

The radial elastic member92is supported by the hammer case6. The radial elastic member92supports the light emitter unit90from radially inside. The radial elastic member92includes a radial base92A. The radial base92A is located between the second cylinder62and the light emitter unit90in the radial direction. The radial base92A is cylindrical. The radial base92A surrounds the second cylinder62.

The radial base92A includes an inner circumferential surface facing the outer circumferential surface of the second cylinder62, and radial ribs92D. Each radial rib92D protrudes radially inward from the inner circumferential surface of the radial base92A. The radial ribs92D are multiple radial ribs92D arranged circumferentially at intervals. The radial ribs92D are in contact with the outer circumferential surface of the second cylinder62. The inner circumferential surface of the radial base92A is apart from the outer circumferential surface of the second cylinder62. The outer circumferential surface of the radial base92A is in contact with the inner circumferential surface of the light emitter unit90. In the embodiment, the inner circumferential surface of the light emitter unit90is the inner circumferential surface of the optical member96.

The radial elastic member92includes a rear support92B and a front support92C. The rear support92B supports the light emitter unit90from the rear. The front support92C supports the light emitter unit90from the front. The rear support92B is connected to the rear end of the radial base92A. The rear support92B protrudes radially outward from the rear end of the radial base92A. The front support92C is connected to the front end of the radial base92A. The front support92C protrudes radially outward from the front end of the radial base92A. The rear support92B and the front support92C are annular. The radial base92A, the rear support92B, and the front support92C are integral with one another.

The rear support92B includes a rear surface facing the front surface of the front wall63, an annular protrusion92E, and first axial ribs92F. The annular protrusion92E protrudes rearward from the rear surface of the rear support92B. Each first axial rib92F protrudes rearward from the rear surface of the rear support92B. The annular protrusion92E is located on the outer edge of the rear surface of the rear support92B. The first axial ribs92F are located radially inward from the annular protrusion92E. The first axial ribs92F are multiple first axial ribs92F arranged circumferentially at intervals. The annular protrusion92E and the first axial ribs92F are in contact with the front surface of the front wall63. The rear surface of the rear support92B is apart from the front surface of the front wall63. The front surface of the rear support92B is in contact with the rear surface of the light emitter unit90. In the embodiment, the front surface of the rear support92B is in contact with the rear surface of the first inner cylinder96C in the optical member96.

The rear surface of the front support92C is in contact with the front surface of the light emitter unit90. In the embodiment, the rear surface of the front support92C is in contact with the front surface of the protrusion96F.

The washer93supports the front support92C from the front. The washer93has a rear surface in contact with the front surface of the front support92C. The ring spring94supports the washer93from the front. The ring spring94is received in a groove62A on the outer circumferential surface of the second cylinder62. The ring spring94is thus fixed to the second cylinder62in the hammer case6. The ring spring94presses the washer93against the front support92C. The washer93and the ring spring94are fixed to at least a part of the hammer case6and function as fasteners for supporting the front support92C from the front.

The front support92C is pushed backward by the ring spring94with the washer93in between. The light emitter unit90and the rear support92B are thus also pushed backward. The light emitter unit90and the radial elastic member92are held between the front wall63and the washer93in the front-rear direction. This fixes the light emitter unit90and the radial elastic member92to the hammer case6.

The axial elastic member91supports the light emitter unit90from the rear. The axial elastic member91is located radially outward from the radial elastic member92. The axial elastic member91includes an axial base91A. The axial base91A is located between the front wall63and the light emitter unit90in the axial direction. The axial base91A is annular.

The axial base91A includes a rear surface facing the front surface of the front wall63, an annular protrusion91C, and second axial ribs91D. The annular protrusion91C protrudes rearward from the rear surface of the axial base91A. Each second axial rib91D protrudes rearward from the rear surface of the axial base91A. The annular protrusion91C is located on the outer edge of the rear surface of the axial base91A. The second axial ribs91D are located radially inward from the annular protrusion91C. The second axial ribs91D are multiple second axial ribs91D arranged circumferentially at intervals. The annular protrusion91C and the second axial ribs91D are in contact with the front surface of the front wall63. The rear surface of the axial base91A is apart from the front surface of the front wall63. The front surface of the axial base91A is in contact with the rear surface of the light emitter unit90. In the embodiment, the front surface of the axial base91A is in contact with the rear surface of the first outer cylinder96A in the optical member96.

The axial base91A is held between the front surface of the front wall63and the rear surface of the first outer cylinder96A in the optical member96in the front-rear direction. The axial base91A supports the light emitter unit90from the rear. The axial elastic member91is supported by the hammer case6.

The axial elastic member91includes a cover91B. The cover91B covers the light emitter unit90from radially outside. The cover91B is cylindrical. The cover91B is in contact with the outer circumferential surface of the light emitter unit90. The outer circumferential surface of the light emitter unit90includes the outer circumferential surface of the optical member96. The cover91B covers the outer circumferential surface of the optical member96. The cover91B presses, with its elastic force, the light emitter unit90from radially outside. The axial elastic member91is thus fixed to the light emitter unit90with an elastic force from the cover91B.

As shown inFIG.21, the cover91B has a radial dimension Db smaller than an axial dimension Da of the axial base91A.

As described above, the axial elastic member91supported by the hammer case6support the light emitter unit90from radially inside and radially outside. The radial elastic member92supported by the hammer case6support the light emitter unit90from the rear and the front. The axial elastic member91and the radial elastic member92surround the light emitter unit90. The light emitter unit90and the hammer case6are not in contact with each other with the axial elastic member91and the radial elastic member92in between.

As shown inFIG.9, the axial elastic member91, the radial elastic member92, and the light emitter unit90are located radially inward from a line VL connecting the front end of the first cylinder61and the front end of the anvil16in a cross section including the output rotation axis AX of the anvil16and parallel to the output rotation axis AX.

Shock Absorber

FIG.22is a partial sectional view of the impact tool1according to the embodiment, corresponding to a partially enlarged view ofFIG.9.FIG.23is a partial sectional view of the impact tool1, taken along line C-C inFIG.3as viewed in the direction indicated by the arrows.FIG.24is an exploded perspective view of the impact tool1as viewed from the right front.FIG.25is an exploded perspective view of the impact tool1as viewed from the left rear.FIG.26is a perspective view of the battery housing3as viewed from the right front.FIG.27is a perspective view of the battery housing3as viewed from the left rear.FIG.28is an exploded perspective view of the battery housing3as viewed from the right front.FIG.29is an exploded perspective view of the battery housing3as viewed from the left rear.FIG.30is an exploded perspective view of the battery housing3as viewed from the right front.

The impact tool1includes the main housing2, rubber vibration isolators100(first elastic members), the battery housing3, the battery holder9, the spring45, and the rubber buffer46. The main housing2accommodates the motor10. The rubber vibration isolators100are supported by the main housing2. The battery housing3is supported by the rubber vibration isolators100. The battery pack43is attached to the battery holder9. The spring45and the rubber buffer46are supported by the battery housing3.

The battery housing3includes a holder support31and an elastic member support32. The holder support31supports the battery holder9. The elastic member support32is located in front of the battery pack43attached to the battery holder9.

The battery housing3includes the left battery housing3L and the right battery housing3R. The holder support31is separately located in the left battery housing3L and the right battery housing3R. The battery holder9is held between the holder support31in the left battery housing3L and the holder support31in the right battery housing3R.

The battery holder9holds the terminal unit44. The terminal unit44includes a terminal plate44A and terminals44B. The terminals44B are fixed to the terminal plate44A. The terminals44B protrude downward from the lower surface of the terminal plate44A. The terminals44B in the terminal unit44are connected to the battery terminals in the battery pack43. The battery holder9holds the terminal plate44A. The holder support31has an opening37at the top. The terminal unit44is at least partially received in the opening37. For the terminal unit44connected to the controller11with lead wires, the lead wires extend through the opening37.

The battery holder9is movably supported by the battery housing3. The battery holder9in the embodiment is supported by the battery housing3in a manner movable in the front-rear direction.

The battery holder9includes a terminal holder901, a protrusion902, and slides903.

The terminal holder901holds the terminal plate44A. The battery holder9in the embodiment includes a left battery holder9L and a right battery holder9R. The right battery holder9R is located on the right of the left battery holder9L. The left battery holder9L and the right battery holder9R form a pair of holder halves. The terminal unit44is held between the left battery holder9L and the right battery holder9R.

The protrusion902protrudes frontward from the front end of the terminal holder901. The spring45is a coil spring. The protrusion902is placed inside the spring45.

The battery housing3includes guides35. The guides35guide the slides903included in the battery holder9. The slides903are guided along the guides35in the front-rear direction. The guides35in the embodiment each have a guide groove on the inner surface of the battery housing3. The slides903are movable in the front-rear direction along the guide grooves.

The slides903are located on a right portion and a left portion of the terminal holder901. The guides35are located on the holder support31and adjacent to the left portion and the right portion of the terminal holder901. The battery housing3includes the left battery housing3L and the right battery housing3R. The guides35are located in the left battery housing3L and the right battery housing3R.

The spring45and the rubber buffer46are supported by the elastic member support32in the battery housing3. The elastic member support32includes a spring holder33and rubber holders34. The spring holder33holds the spring45. The rubber holders34hold the rubber buffer46.

The spring holder33has a recess on the elastic member support32. The recess is recessed frontward from the rear surface of the elastic member support32. The spring45has a front portion received in the recess and is thus held by the spring holder33. The protrusion902on the battery holder9is placed inside the spring45through the rear end of the spring45. The rear end of the spring45is supported on the front surface of the terminal holder901.

The rubber buffer46includes a body46A and protrusions46B. Each protrusion46B protrudes frontward from the front surface of the body46A. The protrusions46B are two protrusions46B arranged at an interval in the vertical direction. Each rubber holder34has an opening in the elastic member support32. The protrusions46B are received in the openings. The rubber buffer46is thus held by the rubber holders34. Each rubber holder34(opening) has a portion located in the left battery housing3L. Each rubber holder34(opening) has the other portion located in the right battery housing3R. With the protrusions46B placed between the portions of the rubber holders34(openings) in the left battery housing3L and the other portions of the rubber holders34(openings) in the right battery housing3R, the left battery housing3L and the right battery housing3R are fastened together with the screws3S. The protrusions46B are thus held by the rubber holders34.

The spring45and the rubber buffer46each function as a second elastic member that restricts relative movement of the battery housing3and the battery pack43attached to the battery holder9. The spring45is a compression spring. The spring45urges the battery holder9away from the rubber buffer46.

The battery pack43is slid forward along the battery holder9from the rear of the battery holder9to be attached to the battery holder9. The rubber buffer46is located in front of the battery pack43. The spring45urges the battery holder9backward. The battery holder9urged backward is at least partially in contact with a rear portion of the holder support31, thus positioning the battery holder9in the front-rear direction.

When receiving no external force in a direction toward the rubber buffer46, the battery holder9is at its initial position under an urging force from the spring45. The initial position of the battery holder9is a position at which the battery holder9urged backward is at least partially in contact with the rear portion of the holder support31. When the battery holder9is at the initial position, the rubber buffer46and the battery pack43are out of contact with each other. When the battery holder9receives an external force in the direction toward the rubber buffer46, the rubber buffer46and the battery pack43come in contact with each other. More specifically, when the battery holder9receives no external force in the direction toward the rubber buffer46, the spring45restricts relative movement of the battery housing3and the battery pack43. When the battery holder9receives an external force in the direction toward the rubber buffer46, the rubber buffer46restricts relative movement of the battery housing3and the battery pack43.

The rubber vibration isolators100reduce transmission of vibrations from the main housing2to the battery housing3. The rubber vibration isolators100function as vibration isolators that reduce vibrations received by the battery housing3from the main housing2. The rubber vibration isolators100are located between the main housing2and the battery housing3. The main housing2and the battery housing3are not in contact with each other with the rubber vibration isolators100in between. The battery housing3is located between the main housing2and the battery holder9. The battery holder9is supported by the main housing2with the rubber vibration isolators100and the battery housing3in between.

The rubber vibration isolators100are located on the right and left of the battery housing3. The rubber vibration isolators100include a left rubber vibration isolator100L and a right rubber vibration isolator100R. The left rubber vibration isolator100L is located between the left main housing2L and the left battery housing3L. The right rubber vibration isolator100R is located between the right main housing2R and the right battery housing3R.

Each rubber vibration isolator100is a rod extending in three directions different from one another. Each rubber vibration isolator100includes a first portion101, a second portion102, a third portion103, a fourth portion104, and a fifth portion105. The first portion101and the third portion103extend in the front-rear direction. The third portion103is located frontward from the first portion101. The first portion101and the third portion103are at different positions in the lateral direction. In the left rubber vibration isolator100L, the third portion103is located leftward from the first portion101. In the right rubber vibration isolator100R, the third portion103is located rightward from the first portion101. The second portion102extends laterally. The second portion102connects the front end of the first portion101and the rear end of the third portion103. The fourth portion104extends vertically. The fourth portion104extends downward from the front end of the third portion103. The fifth portion105extends laterally. The fifth portion105is connected to the lower end of the fourth portion104. In the left rubber vibration isolator100L, the fifth portion105extends rightward from the lower end of the fourth portion104. In the right rubber vibration isolator100R, the fifth portion105extends leftward from the lower end of the fourth portion104.

Each rubber vibration isolator100has multiple projections106and a holding groove107. The projections106face the battery housing3. The holding groove107faces the main housing2. The projections106are on the first portion101, the second portion102, the third portion103, the fourth portion104, and the fifth portion105. The holding groove107extends along the first portion101, the second portion102, the third portion103, the fourth portion104, and the fifth portion105.

The battery housing3has holding recesses36to receive the rubber vibration isolators100. Each holding recess36is shaped in conformance with the shape of the corresponding rubber vibration isolator100to receive the first portion101, the second portion102, the third portion103, the fourth portion104, and the fifth portion105.

The holding recesses36are on the left surface of the left battery housing3L and on the right surface of the right battery housing3R. The left rubber vibration isolator100L is received in the holding recess36on the left battery housing3L. The right rubber vibration isolator100R is received in the holding recess36on the right battery housing3R. The projections106are in contact with the inner surfaces of the holding recesses36. The projections106reduce the areas of contact between the rubber vibration isolators100and the battery housing3.

The main housing2includes holding protrusions28placed in the holding grooves107. Each holding protrusion28is shaped in conformance with the shape of the corresponding rubber vibration isolator100to be placed in the holding groove107extending along the first portion101, the second portion102, the third portion103, the fourth portion104, and the fifth portion105.

The holding protrusions28are on the inner surfaces of the left main housing2L and the right main housing2R. The holding protrusion28on the left main housing2L protrudes rightward from the inner surface (right surface) of the left main housing2L. The holding protrusion28on the right main housing2R protrudes leftward from the inner surface (left surface) of the right main housing2R. The holding protrusion28on the left main housing2L is placed in the holding groove107on the left rubber vibration isolator100L. The holding protrusion28on the right main housing2R is placed in the holding groove107on the right rubber vibration isolator100R.

In the embodiment, the first portion101, the second portion102, the third portion103, the fourth portion104, and the fifth portion105extending in directions different from one another are integral with one another. The first portion101, the second portion102, the third portion103, the fourth portion104, and the fifth portion105may be separate from one another.

Operation of Impact Tool

The operation of the impact tool1will now be described. To perform a fastening operation on a workpiece, for example, a socket for the fastening operation is attached to the front end of the anvil16. The operator then grips the side handle7with the left hand and the grip23with the right hand, and operates the trigger lever17A with the right index finger and the right middle finger to move the trigger lever17A backward. When the trigger lever17A moves backward, power is supplied from the battery pack43to the motor10to drive the motor10and turn on the light assembly18. As the motor10is driven, the rotor48and the rotor shaft49rotate. A rotational force of the rotor shaft49is transmitted to the planetary gears55P through the first bevel gear53, the second bevel gear54, and the sun gear55S. The planetary gears55P revolve about the sun gear55S while rotating and meshing with the internal teeth on the internal gear55I. The planetary gears55P are rotatably supported by the spindle14with the pin55A. The revolving planetary gears55P rotate the spindle14at a lower rotational speed than the rotor shaft49.

When the spindle14rotates with the hammer projections71B and the anvil projections16C in contact with each other, the anvil16rotates together with the hammer71and the spindle14. Thus, the fastening operation proceeds.

When the anvil16receives a predetermined or higher load as the fastening operation proceeds, the anvil16and the hammer71stop rotating. When the hammer71stops rotating and the spindle14rotates, the hammer71moves backward. Thus, the hammer projections71B come out of contact with the anvil projections16C. The hammer71that has moved backward then moves forward while rotating with elastic forces from the first coil spring73and the second coil spring74. The anvil16is thus struck by the hammer71in the rotation direction. The anvil16thus rotates about the output rotation axis AX at high torque. A bolt or a nut is thus tightened at high torque.

In the embodiment, the axial elastic member91and the radial elastic member92reduce transmission of vibrations from the hammer case6to the light emitter unit90. The light emitter unit90is thus isolated from vibrations. This reduces, for example, the likelihood that connections between the substrate95A and the LED chips95B soldered to each other are damaged, and wires on the substrate95A are damaged. In other words, this reduces failures in the light emitter unit90.

In the embodiment, the rubber vibration isolators100reduce transmission of vibrations from the main housing2to the terminal unit44and the battery pack43. Each rubber vibration isolator100extends in the three directions that are the front-rear direction, the vertical direction, and the lateral direction. The rubber vibration isolator100can thus reduce vibrations applied to the terminal unit44and the battery pack43in the three directions.

When the impact tool1is dropped and the battery pack43hits the floor surface or the ground, the battery holder9moves forward, causing the battery pack43to come in contact with the rubber buffer46. This reduces a shock to the battery pack43.

As described above, the impact tool1according to the embodiment includes the motor10, the hammer71rotatable by the motor10, the anvil16strikable by the hammer71in the rotation direction, the hammer case6accommodating the hammer71, the light emitter unit90including the LED chips95B as light emitters that illuminate the front end of the anvil16and an area adjacent to the front end of the anvil16, and the radial elastic member92supported by the hammer case6and supporting the light emitter unit90from radially inside.

In the above structure, the radial elastic member92reduces vibrations applied to the light emitter unit90in the radial direction. The light emitter unit90is isolated from vibrations, reducing failures in the light emitter unit90.

The hammer case6in the embodiment includes the first cylinder61surrounding the hammer71, the second cylinder62located frontward from the first cylinder61and having a smaller outer diameter than the first cylinder61, and the front wall63connecting the front end of the first cylinder61and the rear end of the second cylinder62. The light emitter unit90at least partially surrounds the second cylinder62. The radial elastic member92includes the radial base92A between the second cylinder62and the light emitter unit90in the radial direction.

The radial base92A thus reduces vibrations applied to the light emitter unit90in the radial direction.

The radial base92A in the embodiment includes the inner circumferential surface facing the outer circumferential surface of the second cylinder62, and the radial ribs92D protruding radially inward from the inner circumferential surface. The radial ribs92D are in contact with the outer circumferential surface of the second cylinder62.

This structure reduces the area of contact between the radial elastic member92and the second cylinder62. Vibrations are thus less likely to be transmitted from the hammer case6to the light emitter unit90through the radial base92A.

The radial base92A in the embodiment is in contact with the inner circumferential surface of the light emitter unit90.

The light emitter unit90is thus not in direct contact with the hammer case6, but is in contact with the radial base92A. This structure effectively isolates the light emitter unit90from vibrations and reduces failures in the light emitter unit90.

The radial elastic member92in the embodiment includes the rear support92B supporting the light emitter unit90from the rear.

The rear support92B thus reduces vibrations applied to the light emitter unit90in the axial direction.

The rear support92B in the embodiment includes the rear surface facing the front surface of the front wall63and the first axial ribs92F protruding rearward from the rear surface. The first axial ribs92F are in contact with the front surface of the front wall63.

This structure reduces the area of contact between the radial elastic member92and the front wall63. Vibrations are thus less likely to be transmitted from the hammer case6to the light emitter unit90through the rear support92B.

The rear support92B in the embodiment is in contact with the rear surface of the light emitter unit90.

The light emitter unit90is not in direct contact with the hammer case6, but is in contact with the rear support92B. This structure effectively isolates the light emitter unit90from vibrations and reduces failures in the light emitter unit90.

The radial elastic member92in the embodiment includes the front support92C supporting the light emitter unit90from the front.

The rear support92B thus reduces vibrations applied to the light emitter unit90in the axial direction.

The front support92C in the embodiment is in contact with the front surface of the light emitter unit90.

The light emitter unit90is not in direct contact with the hammer case6, but is in contact with the front support92C. This structure effectively isolates the light emitter unit90from vibrations and reduces failures in the light emitter unit90.

The impact tool1according to the embodiment includes the washer93and the ring spring94as fasteners fastened to at least a part of the hammer case6and supporting the front support92C from the front.

The light emitter unit90is thus fastened to the hammer case6with the washer93and the ring spring94with the front support92C in between.

The radial elastic member92in the embodiment surrounds the anvil16.

This structure effectively isolates the light emitter unit90from vibrations.

The impact tool1according to the embodiment includes the axial elastic member91supporting the light emitter unit90from the rear.

The axial elastic member91thus reduces vibrations applied to the light emitter unit90in the axial direction. The light emitter unit90is isolated from vibrations, reducing failures in the light emitter unit90.

The hammer case6in the embodiment includes the first cylinder61surrounding the hammer71, the second cylinder62located frontward from the first cylinder61and having a smaller outer diameter than the first cylinder61, and the front wall63connecting the front end of the first cylinder61and the rear end of the second cylinder62. The axial elastic member91includes the axial base91A between the front wall63and the light emitter unit90in the axial direction.

The axial base91A thus reduces vibrations applied to the light emitter unit90in the axial direction.

The axial base91A in the embodiment includes the rear surface facing the front surface of the front wall63, and the second axial ribs91D protruding rearward from the rear surface. The second axial ribs91D are in contact with the front surface of the front wall63.

This structure reduces the area of contact between the axial elastic member91and the front wall63. Vibrations are thus less likely to be transmitted from the hammer case6to the light emitter unit90through the axial base91A.

The axial base91A in the embodiment is in contact with the rear surface of the light emitter unit90.

The light emitter unit90is thus not in direct contact with the hammer case6, but is in contact with the axial base91A. This structure effectively isolates the light emitter unit90from vibrations and reduces failures in the light emitter unit90.

The axial elastic member91in the embodiment includes the cover91B covering the light emitter unit90from radially outside.

The cover91B blocks light emitted radially outward from the light emitter unit90, thus reducing glare to the operator of the impact tool1. The cover91B protects the light emitter unit90.

The cover91B in the embodiment is in contact with the outer circumferential surface of the light emitter unit90.

This effectively reduces glare to the operator. The cover91B effectively protects the light emitter unit90.

The impact tool1according to the embodiment includes the motor10, the hammer71rotatable by the motor10, the anvil16strikable by the hammer71in the rotation direction, the hammer case6accommodating the hammer71, the light emitter unit90including the LED chips95B as light emitters that illuminate the front end of the anvil16and an area adjacent to the front end of the anvil16, and the axial elastic member91supported by the hammer case6and including the axial base91A supporting the light emitter unit90from the rear and the cover91B covering the light emitter unit90from radially outside.

In the above structure, the axial base91A reduces vibrations applied to the light emitter unit90in the radial direction. The light emitter unit90is isolated from vibrations, reducing failures in the light emitter unit90. The cover91B blocks light emitted radially outward from the light emitter unit90, thus reducing glare to the operator of the impact tool1. The cover91B protects the light emitter unit90.

The cover91B in the radial direction in the embodiment has the radial dimension Db smaller than the axial dimension Da of the axial base91A.

In this structure, the axial elastic member91is less likely to be larger, with the axial base91A maintaining vibration isolation and the cover91B maintaining light shield and protection.

The impact tool1according to the embodiment includes the motor10, the hammer71rotatable by the motor10, the anvil16strikable by the hammer71in the rotation direction, the hammer case6accommodating the hammer71, the light emitter unit90including the LED chips95B as light emitters that illuminate the front end of the anvil16and an area adjacent to the front end of the anvil16, the radial elastic member92supported by the hammer case6and including the front support92C supporting the light emitter unit90from front, and the washer93and the ring spring94as fasteners fastened to at least a part of the hammer case6and supporting the front support92C from the front.

In the above structure, the radial elastic member92reduces vibrations applied to the light emitter unit90. The light emitter unit90is isolated from vibrations, reducing failures in the light emitter unit90. The light emitter unit90is fastened to the hammer case6with the washer93and the ring spring94with the front support92C in between. Although vibrations from the hammer case6may be transmitted to the washer93and the ring spring94, the front support92C between the washer93and the light emitter unit90reduces transmission of vibrations from the hammer case6to the light emitter unit90.

The impact tool1according to the embodiment includes the motor10, the hammer71rotatable by the motor10, the anvil16strikable by the hammer71in the rotation direction, the hammer case6accommodating the hammer71, the light emitter unit90including the LED chips95B as light emitters that illuminate the front end of the anvil16and an area adjacent to the front end of the anvil16, and the axial elastic member91and the radial elastic member92supported by the hammer case6and supporting the light emitter unit90from at least three of radially inside, radially outside, rear, or front.

In the above structure, the axial elastic member91and the radial elastic member92reduce vibrations applied to the light emitter unit90in the radial direction and the axial direction. The light emitter unit90is isolated from vibrations, reducing failures in the light emitter unit90.

The hammer case6in the embodiment includes the first cylinder61surrounding the hammer71, the second cylinder62located frontward from the first cylinder61and having a smaller outer diameter than the first cylinder61, and the front wall63connecting the front end of the first cylinder61and the rear end of the second cylinder62. The axial elastic member91, the radial elastic member92, and the light emitter unit90are located radially inward from the line VL connecting the front end of the first cylinder61and the front end of the anvil16in a cross section including the output rotation axis AX of the anvil16and parallel to the output rotation axis AX.

When the impact tool1is dropped on the floor surface or on the ground, the front end of the first cylinder61or the front end of the anvil16hits the floor surface or the ground. This reduces the likelihood that the light emitter unit90hits the floor surface or the ground. This reduces failures in the light emitter unit90.

The light emitter unit90in the embodiment includes the COB LED95.

The COB LED95emits a large amount of light, illuminating a workpiece brightly.

The light emitter unit90in the embodiment includes the optical member96facing the front surface of the LED chips95B as light emitters and transmitting light emitted from the LED chips95B.

This structure allows light emitted from the COB LED95to pass through the optical member96and illuminate a workpiece.

In the embodiment, the optical member96and the substrate in the COB LED95are fastened together with the snap-fits96G as fasteners.

This structure fastens the optical member96and the COB LED95together without an adhesive, thus eliminating time for curing an adhesive during the manufacture of the light emitter unit90. The optical member96and the COB LED95can be smoothly fastened together during the manufacture of the light emitter unit90.

Second Embodiment

A second embodiment will be described. The same or corresponding components as those in the above first embodiment are given the same reference numerals herein and will be described briefly or will not be described.

FIG.31is a perspective view of an impact tool1B according to the present embodiment as viewed from the right front.FIG.32is a partial sectional view of the impact tool1B.FIG.33is a partially enlarged sectional view of a light assembly18B.FIG.34is an exploded perspective view of the light assembly18B as viewed from the right front.

The impact tool1B is an impact wrench as an example of a fastening tool. Similarly to the impact tool1described in the first embodiment, the impact tool1B according to the present embodiment includes a main housing2, a battery housing3, a gear case5, a hammer case6, a side handle7, a spindle14, a striker15, an anvil16, a trigger switch17, and the light assembly18B.

The main housing2includes a body21, a protruding portion22, a grip23, and a controller compartment24. As in the first embodiment, the body21accommodates a motor case4accommodating a motor10. The protruding portion22protrudes downward from the body21. The controller compartment24is located behind the protruding portion22. The grip23is located behind the body21.

The grip23includes a rear grip23A and an upper grip23B. The rear grip23A extends upward from the rear portion of the controller compartment24. The upper grip23B extends frontward from the upper end of the rear grip23A. The rear grip23A has its lower end connected to the controller compartment24. The rear grip23A has its upper end connected to the rear end of the upper grip23B. The upper grip23B has its front end connected to an upper portion of the body21. The grip23, the body21, and the controller compartment24define a D-shaped handle. The D-shaped handle is located behind the motor10. The trigger switch17is located in an upper portion of the rear grip23A.

The hammer case6is substantially cylindrical. The hammer case6includes a first cylinder61(rear cylinder), a second cylinder62(front cylinder), a front wall63, and an annular rib64. The second cylinder62holds an anvil bearing79. The first cylinder61is located rearward from the second cylinder62. The first cylinder61has a larger outer diameter than the second cylinder62. The front wall63connects the front end of the first cylinder61and the rear end of the second cylinder62. The annular rib64protrudes frontward from the outer edge of the front surface of the front wall63. The annular rib64is substantially annular in a plane orthogonal to the output rotation axis AX.

The side handle7includes a handle portion7A and a base7B. The handle portion7A is grippable by the operator. The base7B is fixed to the hammer case6. The base7B includes a first base7C and a second base7D. The second base7D is located below the first base7C. The first base7C and the second base7D are arc-shaped. The first base7C and the second base7D hold the first cylinder61in between. The first base7C and the second base7D have their right ends connected to each other with a hinge7E. The first base7C and the second base7D have their left ends connected to the handle portion7A. In the embodiment, the first base7C and the second base7D have their surfaces covered with rubber portions7F. The rubber portions7F protect the first base7C and the second base7D. The rubber portions7F reduce contact between the base7B and an object around the impact tool1B. The rubber portions7F protect an object around the impact tool1B.

The impact tool1B according to the embodiment includes a rear bumper110and a front bumper120.

The rear bumper110covers at least a part of the surface of the hammer case6. The rear bumper110in the embodiment covers the outer circumferential surface of the first cylinder61, the outer circumferential surface of the annular rib64, and the front end face of the annular rib64. The rear bumper110protects the hammer case6. The rear bumper110is formed from rubber. The rear bumper110reduces contact between the hammer case6and an object around the impact tool1B.

The rear bumper110includes a cylindrical portion111and a protrusion112. The cylindrical portion111covers the outer circumferential surface of the first cylinder61, the outer circumferential surface of the annular rib64, and the front end face of the annular rib64. The protrusion112protrudes radially inward from the rear of the inner circumferential surface of the cylindrical portion111. The cylindrical portion111surrounds the first cylinder61and the annular rib64. The protrusion112is received in a groove61R on the outer circumferential surface of the first cylinder61. The protrusion112is annular and surrounds the output rotation axis AX. The groove61R surrounds the output rotation axis AX.

As described above, the rear bumper110is formed from rubber. The rear bumper110is fastened to the first cylinder61with an elastic force (fastening force) from the rubber. With the protrusion112received in the groove61R, the rear bumper110is positioned relative to the first cylinder61.

The front bumper120covers at least a part of the surface of the hammer case6. The front bumper120in the embodiment covers the outer circumferential surface of the second cylinder62and the front end face of the second cylinder62. The front bumper120protects the hammer case6. The front bumper120reduces contact between the hammer case6and an object around the impact tool1B. The front bumper120is formed from rubber.

The front bumper120includes a cylindrical portion121, an annular portion122, and a protrusion123. The cylindrical portion121covers the outer circumferential surface of the second cylinder62. The annular portion122covers the front end portion of the second cylinder62. The protrusion123protrudes radially inward from the inner circumferential surface of the cylindrical portion121. The cylindrical portion121surrounds the second cylinder62. The protrusion123is received in a groove62R on the outer circumferential surface of the second cylinder62. The protrusion123is annular and surrounds the output rotation axis AX. The groove62R surrounds the output rotation axis AX.

As described above, the front bumper120is formed from rubber. The front bumper120is fastened to the second cylinder62with an elastic force (fastening force) from the rubber. With the protrusion123received in the groove62R, the front bumper120is positioned relative to the second cylinder62.

The spindle14rotates with a rotational force from the motor10transmitted by the reducer13. The spindle14has a front portion accommodated in the hammer case6. The striker15is accommodated in the first cylinder61in the hammer case6.

The anvil16is located frontward from the motor10. The anvil16is an output unit of the impact tool1B that rotates about the output rotation axis AX with a rotational force from the motor10. The anvil16is struck by the hammer71in the striker15in the rotation direction. An anvil shaft16B has its front end located in front of the hammer case6through a front opening of the second cylinder62. The anvil shaft16B receives a socket as a tip tool on the front end.

The anvil shaft16B is rotatably supported by an anvil bearing79. The anvil bearing79is held inside the second cylinder62in the hammer case6. The anvil bearing79in the embodiment is a slide bearing. The anvil bearing79is cylindrical.

The light assembly18B emits illumination light. The light assembly18B illuminates the anvil16and an area around the anvil16with illumination light. The light assembly18B illuminates an area ahead of the anvil16with illumination light. The light assembly18B also illuminates the socket attached to the anvil16and an area around the socket with illumination light. The light assembly18B surrounds the second cylinder62in the hammer case6.

The light assembly18B includes a light emitter unit300, an axial elastic member301, and a radial elastic member302.

The light emitter unit300surrounds the second cylinder62. The light emitter unit300includes a COB LED95and an optical member960. As in the above embodiment, the COB LED95includes LED chips as light emitters.

The optical member960faces the front surfaces of the LED chips in the COB LED95. The optical member960transmits light emitted from the LED chips. The optical member960is at least partially located frontward from the COB LED95.

The optical member960includes an outer cylinder960A, an inner cylinder960B, and a light transmitter960C. The outer cylinder960A is located radially outward from the inner cylinder960B. The outer cylinder960A is located adjacent to the outer circumference of the COB LED95. The inner cylinder960B is located adjacent to the inner circumference of the COB LED95. The light transmitter960C is located frontward from the COB LED95. The light transmitter960C connects the front end of the outer cylinder960A and the front end of the inner cylinder960B. The light transmitter960C allows light emitted from the COB LED95to pass through and illuminate an area ahead of the light emitter unit300.

The axial elastic member301and the radial elastic member302are formed from rubber. The axial elastic member301and the radial elastic member302reduce transmission of vibrations from the hammer case6to the light emitter unit300. The axial elastic member301and the radial elastic member302each function as a vibration isolator to reduce vibrations received by the light emitter unit300.

The radial elastic member302is annular. The radial elastic member302surrounds the anvil shaft16B. The radial elastic member302surrounds the second cylinder62.

The radial elastic member302is supported by the hammer case6. The radial elastic member302supports the light emitter unit300from radially inside. The radial elastic member302at least partially faces the front surface of the optical member960. The radial elastic member302includes a radial base302A, a rear support302B, and a front support302C. The radial base302A, the rear support302B, and the front support302C are integral with one another.

The radial base302A is located between the second cylinder62and the light emitter unit300in the radial direction. The radial base302A is cylindrical. The radial base302A surrounds the second cylinder62. The radial base302A has its inner circumferential surface facing the outer circumferential surface of the second cylinder62. The inner circumferential surface of the radial base302A is in contact with the outer circumferential surface of the second cylinder62. The radial base302A has its outer circumferential surface facing the inner circumferential surface of the light emitter unit300. The outer circumferential surface of the radial base302A is in contact with the inner circumferential surface of the light emitter unit300.

The rear support302B supports the light emitter unit300from the rear. The rear support302B is annular. The rear support302B is connected to the rear end of the radial base302A. The rear support302B protrudes radially outward from the rear end of the radial base302A. The rear support302B has its rear surface facing the front surface of the front wall63. The rear support302B has its front surface in contact with the rear surface of the light emitter unit300. The front surface of the rear support302B is in contact with the rear surface of the inner cylinder960B in the optical member960.

The front support302C supports the light emitter unit300from the front. The front support302C is annular. The front support302C is connected to the front end of the radial base302A. The front support302C protrudes radially outward from the front end of the radial base302A. The front support302C has its rear surface in contact with the front surface of the light emitter unit300. The front support302C has its front surface in contact with the rear surface of the front bumper120.

The axial elastic member301is annular. The axial elastic member301surrounds the light emitter unit300.

The axial elastic member301is supported by the light emitter unit300. The axial elastic member301supports the light emitter unit300from the rear. The axial elastic member301is at least partially located between the annular rib64and the light emitter unit300in the radial direction. The axial elastic member301includes an axial base301A, a rear support301B, and a front support301C. The axial base301A, the rear support301B, and the front support301C are integral with one another.

The axial base301A is located between the annular rib64and the light emitter unit300in the radial direction. The axial base301A is cylindrical. The axial base301A surrounds the light emitter unit300. The axial base301A has its outer circumferential surface facing the inner circumferential surface of the annular rib64. The outer circumferential surface of the axial base301A is in contact with the inner circumferential surface of the annular rib64. The axial base301A has its inner circumferential surface facing the outer circumferential surface of the light emitter unit300. The inner circumferential surface of the axial base301A is in contact with the outer circumferential surface of the light emitter unit300.

The rear support301B supports the light emitter unit300from the rear. The rear support301B is annular. The rear support301B is connected to the rear end of the axial base301A. The rear support301B protrudes radially inward from the rear end of the axial base301A. The rear support301B has its rear surface facing the front surface of the front wall63. The rear support301B has its front surface in contact with the rear surface of the light emitter unit300. The front surface of the rear support301B is in contact with the rear surface of the outer cylinder960A in the optical member960.

The front support301C supports the light emitter unit300from the front. The front support301C is annular. The front support301C is connected to the front end of the axial base301A. The front support301C protrudes radially inward from the front end of the axial base301A. The front support301C has its rear surface in contact with the front surface of the light emitter unit300.

The front bumper120covers at least a part of the surface of the hammer case6at a position frontward from the light assembly18B. The front bumper120is in contact with at least a part of the front surface of the light assembly18B. The front bumper120supports the light assembly18B from the front. The front bumper120supports the radial elastic member302from the front. The front bumper120is in contact with at least a part of the front surface of the radial elastic member302.

The front bumper120supports the front support302C from the front. The front bumper120has its rear surface in contact with the front surface of the front support302C.

The front bumper120supports the light emitter unit300from the front with the radial elastic member302in between. The front bumper120supports the optical member960from the front with the radial elastic member302in between. The front bumper120has its outer end located radially outward from the inner end of the optical member960. The outer end of the front bumper120and the inner end of the optical member960overlap each other in the radial direction.

In the embodiment, the rear bumper110and the front bumper120have the same rubber hardness. The radial elastic member302and the axial elastic member301have the same rubber hardness. The front bumper120and the rear bumper110have higher rubber hardness than the radial elastic member302and the axial elastic member301.

As described above, the rubber front bumper120in the embodiment reduces the likelihood that the light assembly18B slips forward from the second cylinder62. The front bumper120formed from rubber reduces wear of the second cylinder62when the impact tool1B vibrates. For a front bumper120formed from a metal, the outer circumferential surface of the second cylinder62may wear or the inner surface of the groove62R may wear when the impact tool1B vibrates. The front bumper120in the embodiment is formed from rubber. The second cylinder62is thus less likely to wear when the impact tool1B vibrates.

FIG.35is a partially enlarged sectional view of the impact tool1B according to a modification. As shown inFIG.35, the annular portion122may be eliminated from the front bumper120. When the annular portion122is included, the socket received in the anvil shaft16B may come in contact with the front bumper120. This may easily degrade the front bumper120. Without the annular portion122, the socket received in the anvil shaft16B is less likely to come in contact with the front bumper120, thus reducing degradation of the front bumper120.

Third Embodiment

A third embodiment will be described. The same or corresponding components as those in the above first embodiment are given the same reference numerals herein and will be described briefly or will not be described.

FIG.36is a partial sectional view of an impact tool1C according to the present embodiment.FIG.37is a partially enlarged sectional view of a light assembly.FIG.38is an exploded perspective view of the light assembly as viewed from the right front.

The impact tool1C is a modification of the impact tool1B described in the second embodiment. The main difference between the impact tool1B and the impact tool1C is that the hammer case6in the impact tool1B includes the annular rib64but the hammer case6in the impact tool1C includes no annular rib64. The rear bumper110in the impact tool1C has its front end that is bent radially inward. The front end of the rear bumper110is in contact with the outer circumferential surface of the axial elastic member301. The hammer case6is not exposed at the boundary between the front end of the rear bumper110and the outer circumferential surface of the axial elastic member301.

The rear bumper110has its front end located rearward from the rear end of the optical member960. In other words, the front end of the rear bumper110does not overlap the rear end of the optical member960in the axial direction.

FIG.39is a partially enlarged sectional view of the impact tool1C in a modification. As shown inFIG.39, the annular portion122may be eliminated from the front bumper120.

FIGS.40and41are each a partially enlarged sectional view of the impact tool1C in a modification. As shown inFIGS.40and41, the front end of the rear bumper110and the rear end of the axial elastic member301may overlap each other in the radial direction.

In the example shown inFIG.40, the axial elastic member301has a recess301D on the rear of the outer circumferential surface. The recess301D is recessed radially inward from the rear of the outer circumferential surface of the axial elastic member301. The rear bumper110has its front end that is bent radially inward. The front end of the rear bumper110is received in the recess301D. The hammer case6is not exposed at the boundary between the front end of the rear bumper110and the outer circumferential surface of the axial elastic member301.

In the example shown inFIG.41, the axial elastic member301includes a flange301E on the rear of the outer circumferential surface. The flange301E protrudes radially outward from the rear of the outer circumferential surface of the axial elastic member301. The rear bumper110has its front end that is bent radially inward. The rear bumper110has, on its front end, a recess113receiving the flange301E. The hammer case6is not exposed at the boundary between the front end of the rear bumper110and the outer circumferential surface of the axial elastic member301.

Fourth Embodiment

A fourth embodiment will be described. The same or corresponding components as those in the first embodiment are given the same reference numerals herein and will be described briefly or will not be described.

FIG.42is a perspective view of an impact tool1F according to the present embodiment as viewed from the right front.FIG.43is a partial sectional view of the impact tool1F.FIG.44is a partially enlarged sectional view of the impact tool1F.FIG.45is an exploded perspective view of a light assembly18F as viewed from the right front.

The impact tool1F is an impact wrench. Unlike the impact tool described in the above embodiments, the impact tool1F includes no D-shaped handle. The impact tool1F is a pistol impact wrench.

The main housing202in the impact tool1F includes a body221, a grip222, and a battery holding portion223. The body221accommodates a motor10. The grip222protrudes downward from a lower portion of the body221. The battery holding portion223is connected to the lower end of the grip222. The grip222protrudes downward from the middle of the body221in the front-rear direction. The battery holding portion223has a larger profile than the grip222in the front-rear and lateral directions. A battery mount to which the battery pack43is attachable is located in a lower portion of the battery holding portion223.

A hammer case600includes a first cylinder610, a second cylinder620, and a connector630. The second cylinder620is located frontward from the first cylinder610. The connector630connects the front end of the first cylinder610and the rear end of the second cylinder620. The second cylinder620has a smaller outer diameter than the first cylinder610. A striker115is accommodated in the first cylinder610. The second cylinder620holds an anvil bearing790. The anvil bearing790supports a front portion of an anvil116in a rotatable manner. The anvil116has its front end located frontward from the front end of the second cylinder620.

The light assembly18F includes a light emitter unit3000, an axial elastic member3001, and a radial elastic member3002. The axial elastic member3001is at least partially located radially outward from the light emitter unit3000. The radial elastic member3002is at least partially located radially inward from the light emitter unit3000. The light emitter unit3000includes a COB LED95and an optical member9600. The optical member9600is at least partially located frontward from the COB LED95.

A rear bumper1100covers at least a part of the outer circumferential surface of the first cylinder610. A front bumper1200is supported by the second cylinder620. The radial elastic member3002surrounds the second cylinder620. The radial elastic member3002at least partially faces the front surface of the optical member9600. The front bumper1200supports the optical member9600from the front with the radial elastic member3002in between.

Other Embodiments

In the above embodiments, the axial elastic member91and the radial elastic member92are annular. Multiple axial elastic members91may surround the second cylinder62at different positions. Multiple radial elastic members92may surround the second cylinder62at different positions.

In the above embodiments, the battery holder9includes the left battery holder9L and the right battery holder9R located on the right of the left battery holder9L. In other words, the battery holder9is laterally dividable. The battery holder9may be vertically dividable.

In the above embodiments, the impact tool1is an impact wrench. The impact tool may be an impact driver. The impact driver includes an anvil having an insertion hole to receive a tip tool and a chuck assembly to hold the tip tool.

In the above embodiments, the impact tool1is powered by the battery pack43attached to the battery holder. The impact tool1may use utility power (alternating current power supply).

In the above embodiments, the motor10is an inner-rotor brushless motor. The motor10may be an outer-rotor brushless motor or a brushed motor.

REFERENCE SIGNS LIST