Source: https://patents.google.com/patent/US20080025017A1/en
Timestamp: 2018-10-20 12:21:08
Document Index: 619348319

Matched Legal Cases: ['art 66', 'art 66', 'art 59', 'art 59', 'art 59', 'art 64', 'art 64', 'art 64', 'art 64', 'art) 61', 'art 64', 'art 61', 'art) 61', 'art 61', 'art 61', 'art 64', 'art 64', 'art) 61', 'art 64', 'art 64', 'art 64', 'art 61', 'art 61', 'art 64', 'art 61', 'art 64', 'art 59', 'art 64', 'art 61', 'art 64', 'art 64']

US20080025017A1 - Power tool equipped with light - Google Patents
Power tool equipped with light Download PDF
US20080025017A1
US20080025017A1 US11782691 US78269107A US2008025017A1 US 20080025017 A1 US20080025017 A1 US 20080025017A1 US 11782691 US11782691 US 11782691 US 78269107 A US78269107 A US 78269107A US 2008025017 A1 US2008025017 A1 US 2008025017A1
US11782691
US7677752B2 (en )
A power tool includes a main housing, a motor, a hammer case, an end-tool holding part, a driving-force transmitting mechanism, a light-unit mounting part, a light unit, and a cover. The motor is accommodated in the main housing and is configured to generate a driving force. The hammer case has an outer peripheral surface. The end-tool holding part is configured to hold an end tool. The driving-force transmitting mechanism is accommodated in the hammer case. The driving-force transmitting mechanism is configured to transmit the driving force to the end-tool holding part. The light-unit mounting part is formed integrally with the hammer case. The light unit is mounted to the light-unit mounting part. The cover covers the outer peripheral surface of the hammer case and accommodates the light-unit mounting part and the light unit.
The present invention relates to a power tool, and particularly to a power tool having a light for irradiating an end tool and a workpiece.
The light source of the power tool including the LED or other light is mounted as a unit or assembly (hereinafter referred to as a “light unit”) on the front of the housing or the front of the hammer case.
A power tool according to a first embodiment of the present invention will be described while referring FIGS. 1 through 12. In the following description and the drawings, the expressions “front”, “rear”, “upper”, “lower”, “right”, and “left” are used only for description purposes.
The motor 4 is activated when the user switches on the trigger 6. At this time, rotation of the output shaft 4 a of the motor 4 is transmitted to the spindle 16 after being reduced by the planetary gear mechanism 5 and drives the spindle 16 to rotate at a prescribed speed. The spindle 16 is linked with the hammer 17 by a cam mechanism. The cam mechanism is configured of V-shaped spindle cam grooves 16 a formed in the outer surfaces of the spindle 16, a V-shaped hammer cam groove 17 a formed in the inner surface of the hammer 17, and the balls 18 engaged in the spindle cam grooves 16 a and the hammer cam groove 17 a.
The spring 19 constantly urges the hammer 17 in a frontward direction. During an idle state, a gap is formed between the hammer 17 and the anvil 20 by the engagement of the balls 18 and the spindle cam grooves 16 a and the engagement of the balls 18 and the hammer cam grooves 17 a. The hammer 17 has a pair of protrusions 17P which protrude from a surface 17S of the hammer 17 at symmetrical positions about a rotational axis RA. The anvil 20 has a pair of arms 20A which extend radially outwardly at symmetrical positions about the rotational axis RA. An end tool such as a bit (not shown) is detachably mounted to the anvil 20.
The light unit 15 is mounted on the lower front end of the hammer case 3 as described blow. First, as shown in FIG. 5, the base plate 23 (attached with the chip LED 24 and the lead wires 12) is inserted from above into the slit-shaped fitting groove 25 b of the holder member 25, such that the LED 24 is accommodated in the accommodating space 25 a (see also FIG. 9).
A power tool according to a second embodiment of the invention will be described while referring to FIGS. 10 through 12, wherein like parts and components are designated by the same reference numerals to avoid duplicating description.
A power tool according to a third embodiment of the invention will be described while referring to FIGS. 13 through 19, wherein like parts and components are designated by the same reference numerals to avoid duplicating description.
From the rear end to the front end of the main housing 52 in the X-direction, the main housing 52 accommodates the motor 54, and a speed reduction mechanism 56. The speed reduction mechanism 56 includes a pinion 56 a which serves as an output shaft of the motor 54, and a planetary gear 56 b engaged with the pinion 56 a.
The hammer case 64 accommodates an impact mechanism 57, and an anvil 58 that receives an impact force from the impact mechanism 57 and rotates. The impact mechanism 57 includes a spindle 57 a for transmitting the rotational force from the speed reduction mechanism 56, a coil spring 57 b provided around an outer surface of the spindle 57 a, and a hammer 57 c that generates an impact force by the action of the coil spring 57 b. An end-tool holding part 66 is provided on a front end of the anvil 58 for detachably mounting a drill bit (not shown) or other end tool. The drill bit or desired end tool can be inserted into the end-tool holding part 66 and clamped therein. A protective cover 59 includes a peripheral part 59A covering an outer peripheral surface of the hammer case 64, and a protruding part 59B protruding downward (radially outwardly) from the peripheral part 59A for accommodating the light-unit accommodating part 64 a and the light unit 60. The protective cover 59 is formed of an elastic material such as rubber. A front cap 65 fits onto a front end of the hammer case 64 for preventing the protective cover 59 from coming unseated.
As shown in FIG. 14, an insertion hole (nest) 64 b (concave part) for accommodating the light unit 60 is formed in the light-unit accommodating part 64 a. The insertion hole 64 b has an inner peripheral surface 64 i. As shown in FIG. 15, a slit 64 c is formed in the light-unit accommodating part 64 a in the front-rear direction. The slit 64 c extends over the entire protruding part of the light-unit accommodating part 64 a along an insertion direction in which the light unit 60 is inserted in the insertion hole 64 b.
As shown in FIGS. 16A through 17A, the light cover 61 constituting part of the light unit 60 has an engaging part (protruding part) 61 c. The light cover 61 also has an outer peripheral surface 61 s. When a main body of the light unit 60 is inserted into the insertion hole 64 b formed in the light-unit accommodating part 64 a, the engaging part 61 c slidingly engaged with the slit 64 c simultaneously. At this time, the outer peripheral surface 61 s of the light cover 61 slides on the inner peripheral surface 64 i of the insertion hole 64 b. An engaging part (hook part) 61 f is provided on a rear end of the engaging part 61 c. When the light cover 61 is completely inserted into the insertion hole 64 b, the engaging part 61 f engages with a rear wall portion 64 f of the light-unit accommodating part 64 a, as illustrated in FIG. 19, thus fixing the light cover 61 in the light-unit accommodating part 64 a.
As shown in FIGS. 17A and 17B, the light cover 61 is formed by joining a first half-split cover 61 a (shown in FIG. 17A) and a second half-split cover 61 b (shown in FIG. 17B). Note that the hatched regions in FIGS. 17A and 17B show joining surfaces between the half-split covers 61 a and 61 b. As shown in FIG. 17B, the lighting element 62 is first arranged in a light insertion hole (recessed part) 61 e formed in the second half-split cover 61 b, with the lead wire 63 drawn out through a lead wire hole 61 d. Next, the first half-split cover 61 a is placed over the second half-split cover 61 b, forming the light cover 61 that can be inserted into the insertion hole 64 b of the light-unit accommodating part 64 a. At this time, the optical axis of the lighting element 62, i.e. a center axis B of the light insertion hole 61 e, is adjusted to a prescribed angle θa relative to a center axis A of the light cover 61.
First, as shown in FIG. 18, the lead wire 63 of the light unit 60 is inserted through the slit 64 c in the light-unit accommodating part 64 a, and pulled out from the rear of the light-unit accommodating part 64 a.
Next, as shown in FIG. 19, the main body of the light unit 60 is inserted into the insertion hole 64 b. At this time, the engaging part 61 c of the light unit 60 slides in the slit 64 c. When the light cover 61 is inserted all the way into the insertion hole 64 b, the engaging part 61 f engages with the rear wall portion 64 f of the light-unit accommodating part 64 a, thereby serving as a first retaining member. Further, since the slit 64 c and the rear wall portion 64 f fix the position of the engaging part 61 c, the light unit 60 can be accommodated at a prescribed positional relationship with the light-unit accommodating part 64 a.
After the main body of the light unit 60 has been inserted into the insertion hole 64 b, the protective cover 59 formed of rubber or another elastic material is fitted over the hammer case 64. The protruding part 59B of the protective cover 59 is formed with a window (hole) at a diameter D2 which is smaller than a diameter D1 of the insertion hole 64 b. Hence, the protective cover 59 can enhance the reliability of holding the lighting element 62 in the insertion hole 64 b when fitted over the light-unit accommodating part 64 a of the hammer case 64. After mounting the protective cover 59, the front cap 65 is attached to the front end part of the hammer case 64, thereby preventing the protective cover 59 from coming unseated. Accordingly, the protective cover 59 and the front cap 65 serve as a second retaining member for the light unit 60.
With the above-described construction, the light unit 60 can be accurately positioned when inserted into the insertion hole 64 b, thereby obtaining a predetermined light-irradiating angle. Further, the engaging part 61 f of the light cover 61 engages with the light-unit accommodating part 64 a of the hammer case 64, as shown in FIG. 19, preventing the light unit 60 from coming out, to the front, from the insertion hole 64 b.
Further, since the lighting element 62 can be disposed in the light-unit accommodating part 64 a of the hammer case 64 and the light unit 60 can be positioned near the rotational axis X and the front end of the impact driver 51, the illuminating range of the lighting element 62 can be increased. That is, the lighting element 62 can illuminate a broad region in order to support different lengths of screws driven by the end tool and different lengths of the end tool, while eliminating shadows formed by the body of the impact driver 51.
a light unit mounted to the light-unit mounting part; and
2. The power tool as claimed in claim 1, wherein the cover includes:
wherein the cover has an opening with a second diameter smaller than the first diameter.
6. The power tool as claimed in claim 4, wherein the light unit includes a lighting element and a light cover having an outer peripheral surface;
9. The power tool as claimed in claim 8, wherein the protruding part includes a rib that protrudes from the outer surface of the hammer case.
15. The power tool as claimed in claim 1, wherein the cover is made of an elastic material.
a light-unit mounting part that is provided at the outer peripheral surface of the hammer case and that is formed integrally with the hammer case, the light-unit mounting part being formed with an insertion hole and with a slit; and
a light unit accommodated in the insertion hole, the light unit having an engaging part that engages the slit.
a rib that protrudes from the outer peripheral surface of the hammer case and that is provided between the trigger switch and the guide sleeve with respect to the first direction; and
a light unit including a lighting element that irradiates light, and a holder member that holds the lighting element and that is mounted to the rib.
20. The power tool as claimed in claim 19, further comprising a cover that covers the outer peripheral surface of the hammer case and that accommodates the light-unit mounting part and the light unit.
US11782691 2006-07-26 2007-07-25 Power tool equipped with light Active 2028-03-17 US7677752B2 (en)
JPP2006-202746 2006-07-26
JP2006202746A JP4936213B2 (en) 2006-07-26 2006-07-26 Electric tool
JP2006243170A JP4923883B2 (en) 2006-09-07 2006-09-07 Electric tool
JPP2006-243170 2006-09-07
US20080025017A1 true true US20080025017A1 (en) 2008-01-31
US7677752B2 US7677752B2 (en) 2010-03-16
ID=38621958
US11782691 Active 2028-03-17 US7677752B2 (en) 2006-07-26 2007-07-25 Power tool equipped with light
US (1) US7677752B2 (en)
EP (1) EP1882553B1 (en)
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Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TADOKORO, NAOKI;SAITO, TAKUMA;TERANISHI, TAKUYA;AND OTHERS;REEL/FRAME:019721/0853