Patent ID: 12193371

DETAILED DESCRIPTION

Representative, non-limiting examples of the present disclosure will now be described in further detail with reference to the attached drawings. This detailed description is merely intended to teach a person of skill in the art further details for practicing aspects of the present teachings and is not intended to limit the scope of the present disclosure. Furthermore, each of the additional features and teachings disclosed below may be utilized separately or in conjunction with other features and teachings to provide improved hedge trimmers, as well as methods for using and manufacturing the same.

Moreover, combinations of features and steps disclosed in the following detailed description may not be necessary to practice the present disclosure in the broadest sense, and are instead taught merely to particularly describe representative examples of the present disclosure. Furthermore, various features of the above-described and below-described representative examples, as well as the various independent and dependent claims, may be combined in ways that are not specifically and explicitly enumerated in order to provide additional useful embodiments of the present teachings.

All features disclosed in the description and/or the claims are intended to be disclosed separately and independently from each other for the purpose of original written disclosure, as well as for the purpose of restricting the claimed subject matter, independent of the compositions of the features in the embodiments and/or the claims. In addition, all value ranges or indications of groups of entities are intended to disclose every possible intermediate value or intermediate entity for the purpose of original written disclosure, as well as for the purpose of restricting the claimed subject matter.

In one or more embodiments, a hedge trimmer may comprise: a body housing; a fixed plate attached to the body housing and extending forward from a front part of the body housing; a blade attached to the fixed plate, configured to be movable in a front-rear direction with respect to the fixed plate and extending forward from the front part of the body housing; and a chip receiver detachably attached to the fixed plate, wherein a first engaged part is disposed on a first side surface, the first side surface being one of a left side surface of the fixed plate and a right side surface of the fixed plate, and a second engaged part is disposed on a second side surface, the second surface being the other of the left side surface and the right side surface, wherein the chip receiver comprises: a base part mounted on the fixed plate; a receiving part connected to the base part and configured to receive cut branches and leaves; and an attachment part configured to attach the chip receiver to the fixed plate, wherein the attachment part comprises: a first engaging part fixed to the base part or the receiving part and configured to engage with the first engaged part, a second engaging part supported by the base part or the receiving part and configured to be movable between an engaging position in which the second engaging part is engaged with the second engaged part and a non-engaging position in which the second engaging part is not engaged with the second engaged part, and a manipulation part configured to move the second engaging part from the engaging position to the non-engaging position in response to a user operation, wherein an upper surface of the base part is flat.

In one or more embodiments, the manipulation part may be disposed at the receiving part.

In a configuration in which the manipulation part is disposed at the base part, it is possible that the branches and leaves cut by the blade collide with the manipulation part and the branches and leaves that collided with the manipulation part scatter on ground. According to the above configuration, the branches and leaves cut by the blade can be suppressed from colliding with the manipulation part before they enter the receiving part. Thus, amounts of branches and leaves that scatter on the ground can be reduced.

Further, in the configuration in which the manipulation part is disposed at the base part, it is possible that branches come into contact with the manipulation part and the second engaging part is thereby moved from the engaging position to the non-engaging position. If this happens, the chip receiver would be detached from the fixed plate during trimming. According to the above configuration, the branches can be suppressed from coming into contact with the manipulation part during the trimming. Thus, the chip receiver can be suppressed from detaching from the fixed plate during the trimming.

In one or more embodiments, the receiving part may be disposed on a second surface side with respect to the base part, and the second engaging part may be disposed at the receiving part of the chip receiver.

The branches and leaves cut by the blade are more likely to collide with the base part when a thickness of the base part is larger, and the amounts of the branches and leaves that scatter on the ground would thereby increase. Due to this, it is desirable that the thickness of the base part is small. If the manipulation part is disposed at the receiving part and the second engaging part is disposed at the base part, a coupling part for coupling the manipulation part and the second engaging part needs to be provided, as a result of which the thickness of the base part becomes larger by a size of the coupling part. According to the above configuration, there is no need to dispose the coupling part for coupling the manipulation part and the second engaging part. Due to this, the thickness of the base part can be made small. Thus, amounts of the branches and leaves coming into contact with the base part can be reduced and the amounts of the branches and leaves that scatter on the ground can be reduced.

In one or more embodiments, the first engaging part may be integrally formed with the base part.

The branches and leaves cut by the blade are more likely to collide with the base part when the thickness of the base part is larger, and the amounts of the branches and leaves that scatter on the ground would thereby increase. Due to this, it is desirable that the thickness of the base part is small. If the first engaging part is fixed to the base part via a fastener, a fastening hole needs to be defined in the base part, as a result of which the thickness of the base part becomes larger. According to the above configuration, there is no need to define the fastening hole in the base part. Due to this, the thickness of the base part can be made small. Thus, the amounts of the branches and leaves coming into contact with the base part can be reduced and the amounts of the branches and leaves that scatter on the ground can be reduced. Further, since the fastener does not need to be used, the number of components of the hedge trimmer can be reduced.

In one or more embodiments, the manipulation part may be configured to be manipulable along a first direction orthogonal to the front-rear direction. The second engaging part may be configured to move along the first direction when the manipulation part is manipulated in the first direction.

According to the above configuration, the direction along which the manipulation part is manipulated matches the direction along which the second engaging part moves. Due to this, a user can easily recognize the moving direction of the second engaging part. Thus, manipulation of the hedge trimmer can be improved.

EMBODIMENT

A hedge trimmer2will be described with reference to the drawings. The hedge trimmer2is a gardening electric tool used for trimming hedges and the like. As shown inFIG.1, the hedge trimmer2comprises a body housing10, a blade unit12attached to the body housing10, and a chip receiver14. The chip receiver14is a member having a shape like a saucer and receives branches and leaves cut by the blade unit12. In the following description, a longitudinal direction of the blade unit12will be termed a front-rear direction, a direction along which blade edges50,56of the blade unit12extend will be termed a left-right direction, and a direction orthogonal to the front-rear direction and to the left-right direction will be termed an up-down direction.

(Configuration of Body Housing10)

The body housing10has a chip guard20, a front handle22, and a rear handle24disposed thereon. The chip guard20is disposed at a front part of the body housing10and is configured to guard against the cut branches and leaves scattering rearward. The front handle22is disposed rearward of the chip guard20. The rear handle24is disposed at a rear part of the body housing10. The front handle22and the rear handle24are configured to be gripped by the user. The hedge trimmer2is a handheld electric tool and normally, the user uses the hedge trimmer2by holding the front handle22by his/her left hand and the rear handle24by his/her right hand. An actuation lever26is disposed on the rear handle24. A battery pack B is detachably attached to the rear part of the body housing10. The body housing10accommodates a motor28(seeFIG.9) and a control board30(seeFIG.9) configured to control actuation of the motor28. The control board30is configured to control operations of the motor28by controlling power supplied from the battery pack B to the motor28. When the actuation lever26is pulled by a finger of the hand gripping the rear handle24, the power is supplied from the battery pack B to the motor28and the motor28thereby actuates the blade unit12. As shown inFIG.2, a front-extending part10aextending forward is attached to a lower part of the body housing10.

(Configuration of Blade Unit12)

The blade unit12extends frontward linearly from the body housing10. As shown inFIG.3, the blade unit12includes a pair of blades40including an upper blade42and a lower blade44, a guide plate46, and a guide bar48.

A plurality of blade edges50is disposed on the upper blade42along the front-rear direction. The plurality of blade edges50is disposed on both left and right sides of the upper blade42. That is, the upper blade42is a double-edged blade. A plurality of elongate holes52is defined in the upper blade42. The plurality of elongate holes52is arranged along the front-rear direction, and a longitudinal direction of each elongate hole52extends along the front-rear direction. An upper connecting rod54is connected to a rear part of the upper blade42. The upper connecting rod54is connected to the motor28(seeFIG.9) via a crank cam (not shown) in the body housing10.

A plurality of blade edges56is disposed on the lower blade44along the front-rear direction. The plurality of blade edges56is disposed on both left and right sides of the lower blade44. That is, the lower blade44is also a double-edged blade. Similarly, a plurality of elongate holes58is defined in the lower blade44. The plurality of elongate holes58is also arranged along the front-rear direction, and a longitudinal direction of each elongate hole58extends along the front-rear direction. Guide members62are inserted into the elongate holes52of the upper blade42and the elongate holes58of the lower blade44to guide reciprocal motions of the upper blade42and the lower blade44. A length of each guide member62in the left-right direction is slightly smaller than a length of each of the elongate holes52,58in the left-right direction. A lower connecting rod60is connected to a rear part of the lower blade44. The lower connecting rod60is also connected to the motor28(seeFIG.9) via the crank cam (not shown) in the body housing10.

A plurality of holes64through which bolts69(seeFIG.2) pass is defined in the guide plate46. A plurality of holes66through which the bolts69(seeFIG.2) pass is defined in the guide bar48. A left engagement groove48aextending in the front-rear direction is defined in a left side surface of the guide bar48. A right engagement groove48b(seeFIG.5) extending in the front-rear direction is likewise defined in a right side surface of the guide bar48. The guide plate46is fixed to the guide bar48by nuts68and the bolts69(seeFIG.2). Further, the pair of blades40is attached to the guide plate46by the nuts68and the bolts69(seeFIG.2). Moreover, the guide plate46and the guide bar48are fixed to the body housing10(more specifically, the front-extending part10a) by the nut68and the bolt69on the rearmost side (seeFIG.2).

(Configuration of Chip Receiver14)

The chip receiver14includes a base part70and a receiving part72. Hereinbelow, an explanation is given with an example where the receiving part72of the chip receiver14is located on the right side of the blade unit12as shown inFIGS.1and2. Here, the base part70refers to a part of the chip receiver14disposed on an upper surface of the guide bar48. Specifically speaking, as shown inFIGS.4and5, the part of the chip receiver14on the A1 side with respect to a plane P (on the left side in the present embodiment) is termed the base part70. The plane P is a plane that expands in the up-down direction and the front-rear direction and passes the right end of the guide bar48. Further, a part of the chip receiver14that is on the A2 side with respect to the plane P (on the right side in the present embodiment) is termed the receiving part72. A plurality of elongate holes78is defined in the base part70. The plurality of elongate holes78is arranged along the front-rear direction, and a longitudinal direction of each elongate hole78extends along the front-rear direction. A length of each elongate hole78in the left-right direction is slightly larger than a length of each nut68in the left-right direction. An upper surface of the base part70includes a flat part70athat is parallel to a plane expanding in the front-rear direction and the left-right direction and, in the front-rear direction, a frontmost side of the base part70has a front wall70fand a rearmost side of the base part70has a rear wall70r. The base part70does not have a protruding part that protrudes to a higher level than the flat part70a, such that an entirety of an upper surface of the base part70that extends from the front wall70fto the rear wall70ris flat. Further, two recesses79athat are indented downward are defined in the base part70. Through holes79bpenetrating the recesses79ain the up-down direction are defined in the recesses79a. In a variant, a rib or a protruding part with a size that does not interrupt the branches and leaves cut by the pair of blades40from entering the receiving part72may be disposed on the upper surface of the base part70. For example, in the case where a rib extending in the left-right direction is disposed on the upper surface of the base part70, the size of the rib in the up-down direction is preferably twice a thickness of the base part70or less, and the size of the rib in the front-rear direction is half the thickness of the base part70or less. The rib with such a size does not interrupt the branches and leaves cut by the pair of blades40from entering the receiving part72.

The receiving part72includes a right extending part74extending rightward from the base part70and an upper extending part76extending upward from the right end of the right extending part74. Two protruding parts80protruding upward are disposed at the receiving part72. The two protruding parts80are arranged along the front-rear direction. The two protruding parts80are disposed on the right side of the recesses79aof the base part70. As shown inFIG.5, the protruding parts80extend in the left-right direction and have a bulging shape bulging upward from the right extending part74. A boss82opening downward is disposed on each of the protruding parts80. A first downwardly extending part84extending downward is disposed at the left end of each of the protruding parts80. A second downwardly extending part86extending downward is disposed in a vicinity of the right end of each of the protruding parts80. An opening88is defined in the receiving part72on the right side of each of the protruding parts80.

As shown inFIG.3, the chip receiver14further includes two attachment parts90. The two attachment parts90are arranged along the front-rear direction. The two attachment parts90are arranged at positions corresponding to the two protruding parts80of the receiving part72. As shown inFIGS.5and6, the attachment parts90each include a first engaging part92, a supporting part100, a movable part102, and a spring104. Each first engaging part92is integrated with the base part70. Each supporting part100includes a first flat part106, a step part108, and a second flat part110. Further, the first flat part106, the step part108, and the second flat part110are disposed in this order from the right side. The step part108connects the left end of the first flat part106to the right end of the second flat part110. The second flat part110is located at a higher level than the first flat part106. A curved part112is disposed in a vicinity of the right end of the first flat part106. The curved part112curves upward from the left side toward the right side. An opening114is defined at a lower portion of the curved part112. The opening114is an opening for suppressing branches and leaves from staying on the right side of the movable part102. A bolt hole116is defined in the second flat part110. In the state where the supporting part100is fixed to its corresponding protruding part80, positions of the right end of the second flat part110and the right end of the second downwardly extending part86of the protruding part80substantially match. The supporting part100is fixed to its corresponding protruding part80by threadedly engaging a bolt134onto the bolt hole116and the boss82in the state where the movable part102and the spring104are mounted on their corresponding supporting part100.

As shown inFIG.6, the movable part102includes a manipulation part120, a first step part122, leftwardly extending parts124extending leftward from both front and rear ends of the first step part122, a second step part126, and a second engaging part128. The manipulation part120, the first step part122, the leftwardly extending parts124, the second step part126, and the second engaging part128are disposed in this order from the right side. The first step part122connects the manipulation part120and the right ends of the leftwardly extending parts124. The leftwardly extending parts124are located at a higher level than the manipulation part120. The second step part126connects the left ends of the leftwardly extending parts124and the second engaging part128. The leftwardly extending parts124are located at a higher level than the second engaging part128. The manipulation part120is a member which the user can manipulate, and is curved upward from the left side toward the right side. A connecting part130that connects the front and rear leftwardly extending parts124is disposed between the first step part122and the second step part126. As shown inFIG.7, a recess132is defined at a lower part of the connecting part130. A size of the recess132in the front-rear direction is slightly larger than a size of the spring104in the front-rear direction. As shown inFIG.5, a housing unit for the spring104is defined by the second downwardly extending part86of its corresponding protruding part80, the second flat part110of the corresponding supporting part100, and the recess132of the corresponding movable part102. The right end of the spring104contacts the second downwardly extending part86of the protruding part80, and the left end of the spring104contacts the left end of the recess132of the movable part102. The second engaging part128engages with the right engagement groove48bof the guide bar48. The user can move the movable part102in the left-right direction with respect to the protruding part80and the supporting part100by manipulating the manipulation part120in the left-right direction. By moving the movable part102in the left-right direction, switch between an engaging position at which the second engaging part128is engaged with the right engagement groove48b(position ofFIG.5) and a non-engaging position at which the second engaging part128is not engaged with the right engagement groove48b(position ofFIG.8) can be realized. The second engaging part128is biased to the engaging position (seeFIG.5) by the spring104in a normal state. Specifically, the movable part102is biased by the spring104leftward with respect to the protruding part80and the supporting part100, by which the second engaging part128is biased to the engaging position. The user can visually recognize operations of each of the second engaging parts128through the through holes79bof the base part70.

Next, a procedure to attach the chip receiver14to the guide bar48will be described with reference toFIGS.5and8. The user can attach the chip receiver14to the guide bar48by performing the following procedure simultaneously on the two attachment parts90. Hereinbelow, the explanation will be given with an example of the procedure performed on the rear-side attachment part90.

Firstly, the user moves the manipulation part120of the attachment part90rightward. Then, the user brings the base part70onto the guide bar48, and engages the first engaging part92of the base part70with the left engagement groove48aof the guide bar48. Due to this, as shown inFIG.8, the left end of the second engaging part128is positioned under the first downwardly extending part84of the protruding part80. Then, the user releases his/her finger from the manipulation part120. In this case, as shown inFIG.5, the movable part102moves leftward with respect to the protruding part80and the supporting part100by biasing force of the spring104. Then, the second engaging part128engages with the right engagement groove48bof the guide bar48. Due to this, the first engaging part92is engaged with the left engagement groove48aand the second engaging part128is engaged with the right engagement groove48b. The chip receiver14can be attached to the guide bar48by performing such a procedure simultaneously on the two attachment parts90. The foregoing explanation on the procedure to attach the chip receiver14to the guide bar48was given based on the case where the first engaging part92is engaged with the left engagement groove48aand the second engaging part128is engaged with the right engagement groove48b, however, in the hedge trimmer2of the present embodiment, the chip receiver14can also be attached to the guide bar48by engaging the first engaging part92with the right engagement groove48band engaging the second engaging part128with the left engagement groove48a. In this case, the receiving part72of the chip receiver14is arranged on the left side of the guide bar48. The user can cut the branches and leaves by using the right blade edges50,56of the upper blade42and the lower blade44.

Next, a procedure to detach the chip receiver14from the guide bar48will be described with reference toFIGS.5and8. The user can detach the chip receiver14from the guide bar48by performing the following procedure simultaneously on the two attachment parts90. Hereinbelow, the explanation will be given on the procedure performed on the rear-side attachment part90.

Firstly, the user moves the manipulation part120rightward. Due to this, as shown inFIG.8, the second engaging part128moves from the engaging position to the non-engaging position. That is, engagement of the second engaging part128and the right engagement groove48bis released. Then, the user tilts the chip receiver14with respect to the guide bar48and releases engagement of the first engaging part92and the left engagement groove48a. Then, the user moves the chip receiver14upward. The chip receiver14can be detached from the guide bar48by performing such a procedure simultaneously on the two attachment parts90. In the hedge trimmer2of the present embodiment, operation to detach the chip receiver14from the guide bars48needs to be performed simultaneously on the two attachment parts90. For example, the user needs to manipulate the front attachment part90with his/her right hand and also manipulate the rear attachment part90with his/her left hand. According to such a configuration, the operation for detaching the chip receiver14from the guide bar48can be suppressed from being performed in the state where the actuation lever26of the hedge trimmer2is being manipulated, that is, in the state where the pair of blades40is actuated. Thus, safety of the user who uses the hedge trimmer2can be improved.

Further, in the hedge trimmer2of the present embodiment, a guard180can be attached between the guide bar48and the base part70of the chip receiver14, for example. As shown inFIG.10, the guard180has a plurality of guard members182disposed along the front-rear direction. The plurality of guard members182is disposed on both left and right sides of the guard180. The guard180suppresses a relatively large object from contacting the plurality of blade edges50of the upper blade42and the plurality of blade edges56of the lower blade44. Each of the attachment parts90of the chip receiver14is configured to be disposed between two guard members182arranged adjacently in the front-rear direction in the state where the chip receiver14and the guard180are attached to the guide bar48.

In one or more embodiments, the hedge trimmer2comprises the body housing10, the guide bar48(an example of “fixed plate”) attached to the body housing10and extending forward from the front part of the body housing10, the pair of blades40attached to the guide bar48, configured to be movable in the front-rear direction and extending forward from the front part of the body housing10, and the chip receiver14detachably attached to the guide bar48, as shown inFIGS.1to9. The left engagement groove48a(an example of “first engaged part”) is disposed on the left side surface (an example of “first side surface”) of the guide bar48, and the right engagement groove48b(an example of “second engaged part”) is disposed on the right side surface (an example of “second side surface”) of the guide bar48. The chip receiver14comprises the base part70mounted on the guide bar48, the receiving part72connected to the base part70and configured to receive the cut branches and leaves, and the attachment parts90configured to attach the chip receiver14to the guide bar48. The attachment parts90each comprise the first engaging part92fixed to the base part70and configured to engage with the left engagement groove48a, the second engaging part128supported by the receiving part72and configured to be movable between the engaging position (seeFIG.5) in which it is engaged with the right engagement groove48band the non-engaging position (seeFIG.8) in which it is not engaged with the right engagement groove48b, and the manipulation part120configured to move the second engaging part128from the engaging position to the non-engaging position in response to the user operation. The upper surface of the base part70is flat. Especially in the present embodiment, any protruding part protruding to a higher level than the upper surface of the base part70is not disposed on the upper surface of the base part70. According to the above configuration, due to the upper surface of the base part70being flat, the branches and leaves cut by the pair of blades40are not interrupted from entering the receiving part72. Thus, most of the branches and leaves cut by the pair of blades40can be received by the receiving part72. As a result of this, the amounts of the branches and leaves that scatter on the ground can be reduced.

Further, in one or more embodiments, the manipulation part120is disposed at the receiving part72of the chip receiver14. In a configuration in which the manipulation part120is disposed at the base part70, it is possible that the branches and leaves cut by the pair of blades40collide with the manipulation part120and the branches and leaves that collided with the manipulation part120scatter on the ground. According to the above configuration, the branches and leaves cut by the pair of blades40can be suppressed from colliding with the manipulation part120before they enter the receiving part72. Thus, amounts of branches and leaves that scatter on the ground can be reduced. Further, in the configuration in which the manipulation part120is disposed at the base part70, it is possible that branches come into contact with the manipulation part120during trimming and the second engaging part128is thereby moved from the engaging position to the non-engaging position. If this happens, the chip receiver14would be detached from the guide bar48during the trimming. According to the above configuration, the branches can be suppressed from coming into contact with the manipulation part120during the trimming. Thus, the chip receiver14can be suppressed from detaching from the guide bar48during the trimming.

Further, in one or more embodiments, the receiving part72is disposed on the right side surface side with respect to the base part70, and the second engaging part128is disposed at the receiving part72of the chip receiver14. The branches and leaves cut by the pair of blades40are more likely to collide with the base part70when the thickness of the base part70is larger, and the amounts of the branches and leaves that scatter on the ground would thereby increase. Due to this, it is desirable that the thickness of the base part70is small. If the manipulation part120is disposed at the receiving part72and the second engaging part128is disposed at the base part70, a coupling part for coupling the manipulation part120and the second engaging part128needs to be provided at the base part70, as a result of which the thickness of the base part70becomes larger by a size of the coupling part. According to the above configuration, there is no need to dispose the coupling part at the base part70for coupling the manipulation part120with the second engaging part128. Due to this, the thickness of the base part70can be made small. Thus, the amounts of the branches and leaves coming into contact with the base part70can be reduced, and the amounts of the branches and leaves that scatter on the ground can be reduced.

Further, in one or more embodiments, the first engaging part92is integrally formed with the base part70. If the first engaging part92is fixed to the base part70via bolt(s) or the like, bolt hole(s) need to be defined in the base part70, and the thickness of the base part70becomes larger. According to the above configuration, there is no need to define the bolt hole(s) in the base part70. Due to this, the thickness of the base part70can be made small. Thus, the amounts of the branches and leaves coming into contact with the base part70can be reduced, and the amounts of the branches and leaves that scatter on the ground can be reduced. Further, since no bolt(s) need to be used, the number of components of the hedge trimmer2can be reduced.

Further, in one or more embodiments, the manipulation part120is configured to be manipulable along the left-right direction, and the second engaging part128moves along the left-right direction when the manipulation part120is manipulated along the left-right direction. According to the above configuration, the direction along which the manipulation part120is manipulated matches the direction along which the second engaging part128moves. Due to this, the user can easily recognize the moving direction of the second engaging part128. Thus, manipulation for the user who uses the hedge trimmer2can be improved.

(First Variant) A guide bar248ofFIG.11may be employed as a replacement to the guide bar48of the embodiment. The guide bar248includes a bottom wall250, a left wall252, and a right wall254. The left wall252extends upward from the left end of the bottom wall250. The right wall254extends upward from the right end of the bottom wall250. A plurality of holes256is defined in the bottom wall250. The plurality of holes256is arranged along the front-rear direction. Two upwardly protruding parts258are disposed on the left wall252. A left engagement hole260is defined in each of the upwardly protruding parts258. Two upwardly protruding parts262are disposed on the right wall254. A right engagement hole264is defined in each of the upwardly protruding parts262. For example, the chip receiver14can be attached to the guide bar248by engaging the first engaging parts92of the attachment parts90to the left engagement holes260and engaging the second engaging parts128of the attachment parts90with the right engagement holes264. In this variant, the left engagement holes260and the right engagement holes264are respectively examples of “first engaged part”, and “second engaged part”.

(Second Variant) The manipulation parts120may be disposed at the base part70.

(Third Variant) The manipulation parts120and the second engaging parts128may be disposed at the base part70and the first engaging parts92may be disposed at the receiving part72.

(Fourth Variant) The base part70and the first engaging parts92may be configured separately. In this case, the first engaging parts92may be fixed to the base part70by bolt(s).

(Fifth Variant) The first engaging parts92may be fixed to the receiving part72.

(Sixth Variant) The pair of blades40may be single-edged blades having the blade edges only on the left or right side.

(Seventh Variant) The chip receiver14may include only one attachment part90, or may include three or more attachment parts90.