Work machine

Abstract

Provided is a technique capable of reducing the shake generated between a handle and a housing in a work machine in which the handle is attached to the housing so as to be rotatable relative to the housing. The present specification discloses a work machine including: a work portion; a prime mover for driving the work portion; a housing for supporting the work portion; a handle attached to the housing so as to be rotatable relative to the housing about a rotation axis, the handle being grippable by a user; and an elastic member disposed between the housing and the handle. The housing includes a first surface. The handle includes a second surface that opposes the first surface at a spacing in the direction of the rotation axis. The elastic member is disposed between the first surface and the second surface.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a type of work machinery. Background Technology

[0002] Patent Document 1 discloses a work machine comprising: a work unit; a prime mover for driving the work unit; a housing for supporting the work unit; and a handle mounted on the housing in a manner rotatable about a rotation axis relative to the housing, for use by a user. The housing includes a first surface. The handle includes a second surface opposite to the first surface at a distance.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: U.S. Patent Application Publication No. 2004 / 0128837 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In a working machine with a handle rotatably mounted relative to the housing as disclosed in Patent Document 1, wobbling sometimes occurs between the handle and the housing. This specification provides a technique for reducing wobbling between the handle and the housing in a working machine where the handle is rotatably mounted relative to the housing.

[0008] Solution for solving the problem

[0009] The working machinery disclosed in this specification may include: a working part; a prime mover for driving the working part; a housing for supporting the working part; a handle mounted on the housing in a manner rotatable relative to the housing about a rotation axis, for use by a user; and an elastic member disposed between the housing and the handle. Alternatively, the housing may include a first surface. Alternatively, the handle may include a second surface spaced apart from the first surface in the direction of the rotation axis. Alternatively, the elastic member may be disposed between the first surface and the second surface.

[0010] According to the above structure, the wobbling between the handle and the housing can be suppressed by using an elastic member disposed between the first and second surfaces. In a working machine in which the handle is mounted on the housing in a manner that allows it to rotate relative to the housing, the wobbling generated between the handle and the housing can be reduced. Furthermore, according to the above structure, since an elastic member is disposed between the first and second surfaces, which are spaced apart in the direction of rotation axis, wobbling in the direction of rotation axis between the handle and the housing can be suppressed.

[0011] Another type of work machine disclosed in this specification may include: a working part; a prime mover for driving the working part; a housing for supporting the working part; a handle mounted on the housing in a manner rotatable relative to the housing about a rotation axis, for gripping by a user; and an elastic member disposed between the housing and the handle. Alternatively, the housing may include a first surface. Alternatively, the handle may include a second surface spaced apart from the first surface. Alternatively, the elastic member may be disposed between the first surface and the second surface. Alternatively, the elastic member may be discretely arranged circumferentially along the rotation axis, including a plurality of abutment portions capable of abutting against the first surface or the second surface.

[0012] According to the above structure, the wobbling between the handle and the housing can be suppressed by utilizing the elastic member disposed between the first and second surfaces. In working machinery where the handle is mounted on the housing in a manner that allows it to rotate relative to the housing, the wobbling generated between the handle and the housing can be reduced. Furthermore, according to the above structure, the sliding resistance generated when the handle rotates relative to the housing can be reduced. Therefore, it becomes easier for the user to rotate the handle. Attached Figure Description

[0013] Figure 1 This is a perspective view of the hedge trimmer 100 of Embodiment 1, viewed from the upper right front.

[0014] Figure 2 This is a side sectional view of the internal structure of the rear handle 18 of the hedge trimmer 100 of Embodiment 1 in a locked state relative to the housing 14, viewed from the right.

[0015] Figure 3 This is a side sectional view of the rear handle 18 of the hedge trimmer 100 of Embodiment 1, viewed from the right.

[0016] Figure 4 This is a side sectional view of the internal structure of the hedge trimmer 100 of Embodiment 1, viewed from the right, with the rear handle 18 not locked relative to the housing 14.

[0017] Figure 5This is a perspective view of the internal structure of the locking member 34 of the hedge trimmer 100 of Embodiment 1 in the forward position, viewed from the upper right rear.

[0018] Figure 6 This is a perspective view of the internal structure of the hedge trimmer 100 of Embodiment 1 in the retracted position, viewed from the upper right rear.

[0019] Figure 7 This is a side sectional view of the housing 14 of the hedge trimmer 100 of Embodiment 1, viewed from the right.

[0020] Figure 8 This diagram schematically illustrates the positional relationship of the connecting part 142, the protrusion 182, and the rubber pin 36 when the housing 14 and the rear handle 18 of the hedge trimmer 100 of Embodiment 1 are connected.

[0021] Figure 9 This is a perspective view of the housing 14 of the hedge trimmer 100 of Embodiment 1, viewed from the upper right rear.

[0022] Figure 10 This is a perspective view of the hedge trimmer 100 of Embodiment 1, viewed from the upper right front, showing the rear handle 18 rotated 90 degrees to the right relative to the housing 14.

[0023] Figure 11 This is a side sectional view of the junction 142 and protrusion 182 of the hedge trimmer 100 of Embodiment 1 in the state of the housing 14 and the rear handle 18 being engaged, viewed from the right.

[0024] Figure 12 This diagram schematically shows the state of the rubber pin 36 when the housing 14 of the hedge trimmer 100 of Embodiment 1 is engaged with the rear handle 18.

[0025] Figure 13 This diagram schematically shows the positional relationship of the connecting part 142, the protrusion 182, and the rubber pin 36 in the modified hedge trimmer 100 when the housing 14 and the rear handle 18 are engaged.

[0026] Figure 14 This diagram schematically illustrates another positional relationship between the connecting part 142, the protrusion 182, and the rubber pin 36 in the modified hedge trimmer 100 when the housing 14 and the rear handle 18 are engaged.

[0027] Figure 15 This diagram schematically illustrates another positional relationship between the connecting part 142, the protrusion 182, and the rubber pin 36 in the modified hedge trimmer 100 when the housing 14 and the rear handle 18 are engaged.

[0028] Figure 16This diagram schematically illustrates another positional relationship between the connecting part 142, the protrusion 182, and the rubber pin 36 in the modified hedge trimmer 100 when the housing 14 and the rear handle 18 are engaged.

[0029] Explanation of reference numerals in the attached figures

[0030] 12. A pair of shearing blades; 12a. Multiple blades; 14. Housing; 16. Front handle; 18. Rear handle; 20. Power cord; 21. First drive switch; 22. Second drive switch; 24. Locking switch; 26. Motor; 28. Crank cam; 30. Circuit unit; 30a. Inverter circuit; 32. Operation button; 34. Locking member; 34a. Engaging protrusion; 34b. Stop; 36. 36a, 36b, 36c, 36d, rubber pins; 100, hedge trimmer; 142, joint; 144a, 144b, opposing surfaces; 144c, engaging surface; 144d, storage groove; 146, receiving hole; 182, protrusion; 182a, base; 182b, flange; 182c, shaft; 184a, 184b, opposing surfaces; 184c, outer surface; 184d, storage groove. Detailed Implementation

[0031] The present invention will now be described in detail with reference to the accompanying drawings, providing representative and non-limiting examples. This detailed description is merely intended to show those skilled in the art the details of preferred embodiments for carrying out the invention, and is not intended to limit the scope of the invention. Furthermore, to provide further improved working machinery, the disclosed additional features and technical solutions may be used independently of other features and technical solutions, or in conjunction with other features and technical solutions.

[0032] Furthermore, the features and combinations of processes disclosed in the following detailed description are not, in the broadest sense, necessary for carrying out the invention, but are described only to illustrate representative specific examples of the invention. Moreover, in providing additional and useful embodiments of the invention, the various features of the following representative examples and the various features recited in the claims are not necessarily to be combined in the same order as the examples described herein or in the listed order.

[0033] All features set forth in this specification and / or claims are intended to be disclosed separately and independently from the structure of the embodiments and / or features set forth in the claims as limitations on the disclosure of the original application and the specific matters set forth in the claims. Furthermore, all numerical ranges and descriptions relating to organizations or groups are intended to limit the disclosure of the original application and the specific matters set forth in the claims, with the intention of disclosing these intermediate structures.

[0034] In one or more embodiments, the working machine may include: a working part; a prime mover for driving the working part; a housing for supporting the working part; a handle mounted on the housing in a manner rotatable relative to the housing about a rotation axis, and capable of being gripped by a user; and an elastic member disposed between the housing and the handle. Alternatively, the housing may include a first surface. Alternatively, the handle may include a second surface spaced apart from the first surface in the direction of the rotation axis. Alternatively, the elastic member may be disposed between the first surface and the second surface.

[0035] According to the above structure, the wobbling between the handle and the housing can be suppressed by using an elastic member disposed between the first and second surfaces. In a working machine in which the handle is mounted on the housing in a manner that allows it to rotate relative to the housing, the wobbling generated between the handle and the housing can be reduced. Furthermore, according to the above structure, since an elastic member is disposed between the first and second surfaces, which are spaced apart in the direction of rotation axis, wobbling in the direction of rotation axis between the handle and the housing can be suppressed.

[0036] In one or more embodiments, one of the housing and the handle may include a shaft portion having an outer surface that tapers in diameter toward a first direction along the axis of rotation. Alternatively, the other of the housing and the handle may include an engaging portion that engages with the outer surface of the shaft portion in the first direction. Alternatively, the first surface and the second surface may be positioned in the direction of rotation toward the first direction side of the shaft portion.

[0037] According to the above structure, the engagement of the outer side of the shaft with the engaging part suppresses movement of one of the housing and the handle relative to the other in the first direction, while the elastic member suppresses movement of one of the housing and the handle in the opposite direction relative to the other. Furthermore, the engagement of the outer side of the shaft with the engaging part suppresses movement of one of the housing and the handle relative to the other in a direction orthogonal to the axis of rotation. With this structure, wobble between the handle and the housing can be effectively reduced.

[0038] In one or more embodiments, the elastic member may be discretely arranged in the circumferential direction of the rotation axis, including a plurality of abutting portions capable of abutting against the first surface or the second surface.

[0039] Based on the above structure, the sliding resistance generated when the handle rotates relative to the housing can be reduced. Therefore, it becomes easier for the user to rotate the handle.

[0040] In one or more embodiments, the working machine may include: a working part; a prime mover for driving the working part; a housing for supporting the working part; a handle mounted on the housing in a manner rotatable relative to the housing about a rotation axis, for a user to grip; and an elastic member disposed between the housing and the handle. Alternatively, the housing may include a first surface. Alternatively, the handle may include a second surface spaced apart from the first surface. Alternatively, the elastic member may be disposed between the first surface and the second surface. Alternatively, the elastic member may be discretely arranged circumferentially along the rotation axis, including a plurality of abutment portions capable of abutting against the first surface or the second surface.

[0041] According to the above structure, the wobbling between the handle and the housing can be suppressed by utilizing the elastic member disposed between the first and second surfaces. In working machinery where the handle is mounted on the housing in a manner that allows it to rotate relative to the housing, the wobbling generated between the handle and the housing can be reduced. Furthermore, according to the above structure, the sliding resistance generated when the handle rotates relative to the housing can be reduced. Therefore, it becomes easier for the user to rotate the handle.

[0042] In one or more embodiments, when viewed from the direction of the rotation axis, the rotation axis is disposed inside a convex polygon with the center of each of the plurality of abutments as its vertex.

[0043] According to the above structure, since multiple abutment parts are arranged around the axis of rotation, the wobble between the handle and the housing can be effectively reduced.

[0044] In one or more embodiments, the plurality of abutting portions may each include abutting surfaces with roundness.

[0045] If any of the multiple abutment portions includes a flat abutment surface, when the handle rotates relative to the housing, the abutment portion may contact one end of the first or second surface, potentially generating significant sliding resistance. According to the structure described above, since each of the multiple abutment portions includes a rounded abutment surface, the sliding resistance generated when the handle rotates relative to the housing can be reduced. Therefore, user comfort can be improved.

[0046] In one or more embodiments, the elastic member may comprise a plurality of elastic cylindrical members having a generally cylindrical shape along the axis of rotation. Alternatively, the plurality of abutment portions may be respectively disposed in each corresponding elastic cylindrical member of the plurality of elastic cylindrical members.

[0047] Based on the above structure, the elastic member can be easily formed, and the elastic member can be easily assembled into the housing or handle.

[0048] In one or more embodiments, the prime mover may be an electric motor.

[0049] In machinery using electric motors as prime movers, the vibrations generated by the prime mover are less compared to machinery using engines. Therefore, the wobble between the handle and the housing has a greater impact on the user's experience. The structure described above, by suppressing wobble between the handle and the housing, improves user comfort.

[0050] (Example 1)

[0051] The following is an example of a hedge trimmer 100 used as an example of a work machine. Figure 1 The hedge trimmer 100 shown is a gardening tool primarily used for trimming hedges and trees. The hedge trimmer 100 includes a pair of cutting blades 12, a housing 14 for supporting the cutting blades 12, a front handle 16 and a rear handle 18 for the user to hold, and a power cord 20 for supplying power from an external source.

[0052] A pair of shearing blades 12 extend forward in a straight line from the housing 14, and have multiple cutting edges 12a along their length. The pair of shearing blades 12 trim hedges and trees by reciprocating with each other using the multiple cutting edges 12a. In the hedge trimmer 100 of this embodiment, the pair of shearing blades 12 are configured to reciprocate separately.

[0053] In this embodiment, the length direction of the pair of shearing blades 12 is defined as the front-back direction, the direction from the housing 14 toward the pair of shearing blades 12 is defined as the forward direction, and the direction from the pair of shearing blades 12 toward the housing 14 is defined as the rearward direction. Furthermore, the direction perpendicular to the front-back direction and parallel to the plane where the plurality of cutting edges 12a of the pair of shearing blades 12 are located is defined as the left-right direction. Additionally, the direction perpendicular to both the front-back and left-right directions is defined as the up-down direction, the direction from the pair of shearing blades 12 toward the housing 14 is defined as the upward direction, and the direction from the housing 14 toward the pair of shearing blades 12 is defined as the downward direction.

[0054] like Figure 2As shown, the front handle 16 and the rear handle 18 are respectively mounted on the housing 14. The front handle 16 is located at the upper front of the housing 14. The rear handle 18 is located at the rear of the housing 14. Furthermore, the rear handle 18 is mounted on the housing 14 in a manner that allows it to rotate relative to the housing 14 about the rotation axis X. The rotation axis X can be slightly tilted up and down relative to the front-back direction, for example, tilted up and down in the range of -20° to 45° relative to the front-back direction with the clockwise direction as positive when viewed from the right. In this embodiment, the rotation axis X is tilted 10° up and down relative to the front-back direction with the clockwise direction as positive. In the following description, for convenience, the direction forward along the rotation axis X is sometimes referred to as the forward direction, and the direction backward along the rotation axis X is sometimes referred to as the rearward direction. The hedge trimmer 100 is a handheld power tool, and the user typically operates the hedge trimmer 100 by holding the front handle 16 with one hand and the rear handle 18 with the other. The front handle 16 extends along a surface that forms an angle relative to the front-rear direction. Figure 1 and Figure 2 In the state shown, the rear handle 18 extends along a plane that is parallel to the front-to-back and up-to-down directions (i.e., a plane that is perpendicular to the left-to-right direction).

[0055] A first drive switch 21 is provided on the front handle 16, and a second drive switch 22 is provided on the rear handle 18. Furthermore, a locking switch 24 is provided on the rear handle 18. The hedge trimmer 100 is configured such that a pair of shearing blades 12 are only driven when both the first drive switch 21 and the second drive switch 22 are operated simultaneously. Furthermore, the second drive switch 22 is normally mechanically locked by the locking switch 24, and is configured such that its operation is only permitted when the locking switch 24 is operated. The user operates the first drive switch 21, the second drive switch 22, and the locking switch 24 respectively by holding the front handle 16 and the rear handle 18. Therefore, the hedge trimmer 100 is configured such that if the user does not hold either the front handle 16 or the rear handle 18, the drive of the pair of shearing blades 12 is prohibited.

[0056] The hedge trimmer 100 also includes an example of a motor 26 as a prime mover. The motor 26, housed in the housing 14, drives a pair of shearing blades 12. In this regard, the motor 26 is connected to the pair of shearing blades 12 via a crank cam 28, configured to cause the pair of shearing blades 12 to reciprocate. In this embodiment, the motor 26 is a brushless motor. The axis of rotation of the motor 26 is perpendicular to the length direction of the pair of shearing blades 12 and extends in the vertical direction.

[0057] The hedge trimmer 100 also includes a circuit unit 30 housed in the upper front part of the housing 14. The circuit unit 30 is electrically connected to the power cord 20, regulating the power supplied from the outside via the power cord 20 and supplying it to the motor 26. When the user operates the first drive switch 21 and the second drive switch 22, the circuit unit 30 begins supplying power to the motor 26; when the operation of the first drive switch 21 or the second drive switch 22 is released, the circuit unit 30 stops supplying power to the motor 26. Therefore, the circuit unit 30 can switch the motor 26 on and off. Furthermore, the circuit unit 30 can switch the main power supply of the hedge trimmer 100 on and off, change the rotation speed of the motor 26, and drive the motor 26 in reverse rotation, etc., based on the operation state of the operation button 32 operated by the user. In this embodiment, since the motor 26 is a brushless motor, the circuit unit 30 also includes an inverter circuit 30a. The inverter circuit 30a is electrically located between the power supply line 20 and the motor 26, converting the DC power from the power supply line 20 into AC power to supply the motor 26.

[0058] (Structure of protrusion 182)

[0059] like Figure 3 As shown, the rear handle 18 includes a protrusion 182 projecting forward. The protrusion 182 includes a shaft portion 182c, a base portion 182a, and a flange portion 182b. The outer surface 184c of the shaft portion 182c has a frustum shape. The outer surface 184c of the shaft portion 182c expands in diameter as it moves forward (second direction) along the rotation axis X, and conversely, contracts in diameter as it moves rearward (first direction) along the rotation axis X. The base portion 182a has a wide annular plate shape and extends radially outward from the rear end of the shaft portion 182c along the rotation axis X. The front surface of the base portion 182a is the opposing surface 184a. The flange portion 182b has a wide annular plate shape and extends radially outward from the front end of the shaft portion 182c along the rotation axis X. The rear surface of the flange portion 182b is the opposing surface 184b. In this embodiment, the opposing surfaces 184a and 184b are surfaces perpendicular to the rotation axis X.

[0060] The rear handle 18 also includes a locking member 34. The locking member 34 is held in the rear handle 18 in a manner that allows it to slide relative to the rear handle 18 in a generally forward-backward direction. The locking member 34 may be slightly tilted upwards and downwards relative to the forward-backward direction, for example, it may be tilted to the same degree as the rotation axis X. In this embodiment, the locking member 34 is tilted 10° upwards and downwards relative to the forward-backward direction with a clockwise orientation when viewed from the right. The locking member 34 is housed within a coil spring (not shown) on the rear handle 18, which applies force forward relative to the rear handle 18. Therefore, as... Figure 2As shown, when the user does not operate the locking member 34, the locking member 34 moves to a forward position protruding from the rear handle 18 toward the housing 14 by means of the force of the coil spring. Figure 4 As shown, when the user pulls the locking member 34 backward against the force of the coil spring, the locking member 34 moves to a retracted position, moving from the housing 14 into the interior of the rear handle 18. Figure 5 As shown, the locking member 34 includes an engaging protrusion 34a protruding in the forward direction and a stop 34b disposed corresponding to the second drive switch 22. When the locking member 34 is in the forward position, the second drive switch 22 is allowed to operate because the second drive switch 22 does not mechanically interfere with the stop 34b of the locking member 34. Figure 6 As shown, when the locking member 34 is in the retracted position, the operation of the second drive switch 22 is prohibited because the second drive switch 22 mechanically interferes with the stop portion 34b of the locking member 34.

[0061] (Structure of joint 142)

[0062] like Figure 7 As shown, the housing 14 includes a coupling portion 142 that engages with a protrusion 182 of the rear handle 18. The coupling portion 142 includes opposing surfaces 144a and 144b. Figure 8 As shown, with the housing 14 and the rear handle 18 engaged, opposing surfaces 144a and 184a are arranged opposite each other at a first interval Y in the direction of the rotation axis X. The first interval Y can be less than 1 mm. In this embodiment, the first interval Y is 0.8 mm. With the housing 14 and the rear handle 18 engaged, opposing surfaces 144b and 184b are arranged opposite each other at a distance in the direction of the rotation axis X. The engaging portion 142 also includes an engaging surface 144c for engaging with the shaft portion 182c. The engaging surface 144c has the same shape as the outer surface 184c of the shaft portion 182c. That is, the engaging surface 144c has a frustum shape. The engaging surface 144c expands in diameter when moving forward (second direction) and contracts in diameter when moving backward (first direction). When the rear handle 18 is to be moved relative to the housing 14 in a first direction, the outer surface 184c of the shaft portion 182c abuts against the engaging surface 144c to suppress the movement of the rear handle 18 relative to the housing 14 in the first direction. That is, the outer surface 184c and the engaging surface 144c engage in the first direction. When the rear handle 18 is to be moved relative to the housing 14 in a direction orthogonal to the rotation axis X, the outer surface 184c of the shaft portion 182c abuts against the engaging surface 144c to suppress the movement of the rear handle 18 relative to the housing 14 in a direction orthogonal to the rotation axis X. That is, the outer surface 184c and the engaging surface 144c also engage in the direction orthogonal to the rotation axis X.

[0063] like Figure 9 As shown, the connecting portion 142 includes an engaging protrusion 34a on the opposing surface 144a that can accommodate the locking member 34 (see reference). Figure 5 , Figure 6 The receiving hole 146 is inserted forward. Since the receiving hole 146 has a shape that engages with the engaging protrusion 34a, when the engaging protrusion 34a is inserted into the receiving hole 146, the locking member 34 is fixed relative to the housing 14 in the circumferential direction along the rotation axis X. Figure 5 As shown, when the locking member 34 is in the forward position, the engagement protrusion 34a is inserted into the receiving hole 146, thus preventing rotation of the rear handle 18 relative to the housing 14. Figure 6 As shown, when the locking member 34 is in the retracted position, the engaging protrusion 34a retracts into the interior of the rear handle 18 and does not interfere with the housing 14, thus allowing the rear handle 18 to rotate relative to the housing 14.

[0064] like Figure 10 As shown, the rear handle 18 can rotate relative to the housing 14. Additionally, Figure 10 The rear handle 18 is rotated 90 degrees to the right relative to the housing 14. This improves the operability of the hedge trimmer 100 because the user can appropriately change the rotation angle of the rear handle 18 relative to the housing 14. By providing multiple receiving holes 146 at the joint 142, the locking member 34 can be fixed in multiple positions. Therefore, the rear handle 18 can be fixed at multiple rotation angles relative to the housing 14.

[0065] like Figure 9 As shown, a plurality of receiving grooves 144d are formed on the opposing surface 144a. Each of the receiving grooves 144d houses an elastic member (in this embodiment, a plurality of rubber pins 36). In this embodiment, four rubber pins 36 are provided on concentric circles about the rotation axis X. Specifically, rubber pin 36a is located on the upper right side of the opposing surface 144a, rubber pin 36b is located on the lower right side of the opposing surface 144a, rubber pin 36c is located on the lower left side of the opposing surface 144a, and rubber pin 36d is located on the upper left side of the opposing surface 144a. In other words, at least one rubber pin 36 is arranged in each of the four quadrants divided by a plane including the vertical direction of the rotation axis X and a plane including the horizontal direction. Figure 8 (a) and Figure 11 As shown, the rubber pin 36 has a generally cylindrical shape along the rotation axis X. The rear end portion of the rubber pin 36 protrudes rearward relative to the opposing surface 144a. The rear end portion of the rubber pin 36 is rounded. It can also be as follows... Figure 8As shown in (b), the rear end portion of the rubber pin 36 is approximately hemispherical. With the housing 14 and the rear handle 18 engaged, the rear end of the rubber pin 36 abuts against the opposing surface 184a. When the rear handle 18 is to be moved forward (second direction) relative to the housing 14, the elastic restoring force of the rubber pin 36 is used to suppress the forward movement of the rear handle 18 relative to the housing 14.

[0066] like Figure 12 As shown, when the housing 14 and the rear handle 18 are engaged, the rubber pin 36 is compressed by an amount C in the direction of the rotation axis X from its natural state. Without the compression C of the rubber pin 36, there is a possibility that the wobbling of the rear handle 18 relative to the housing 14 cannot be sufficiently reduced. When the housing 14 and the rear handle 18 are engaged, the relationship L / 7 > Y holds true between the first interval Y and the natural length L of the rubber pin 36. Furthermore, the relationship d / 5 > Y holds true between the first interval Y and the diameter d of the rubber pin 36. If the relationships between the natural length L, diameter d, and first interval Y do not hold true, the elastic restoring force caused by the elastic deformation of the rubber pin 36 becomes too large, and there is a possibility that the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 cannot be reduced. Additionally, the natural length L of the rubber pin 36 can be in the range of 10.8 mm to 7.2 mm. In this embodiment, the natural length L is 9 mm. The compression C can be in the range of 1.0 mm to 0.2 mm. In this embodiment, the compression C is 0.6 mm. The diameter d of the rubber pin 36 can be in the range of 6.4 mm to 5.2 mm. In this embodiment, the diameter d is 5.8 mm.

[0067] When the rear handle 18 rotates relative to the housing 14, the rubber pin 36 slides in contact with the opposing surface 184a. For example... Figure 9 As shown, since the rubber pins 36 are discretely arranged in the circumferential direction along the rotation axis X, the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 is small. In addition, since the rear end portion of the rubber pins 36 is rounded, it prevents the rear handle 18 from contacting one end of the opposing surface 184a when it rotates relative to the housing 14.

[0068] like Figure 11 As shown, the center of the shaft portion 182c forms a cavity along the rotation axis X, and the interior of the housing 14 is spatially connected to the interior of the rear handle 18. By appropriately arranging electrical wiring (not shown) in the cavity portion of the shaft portion 182c, the circuit unit 30 housed in the upper front part of the housing 14 and the power cord 20 located at the rear of the rear handle 18 can be electrically connected.

[0069] (Modified Example)

[0070] In the above embodiments, a hedge trimmer 100 was described as an example of a working machine. However, the working machine may also be something other than the hedge trimmer 100. For example, the working machine could be a chainsaw, a brush cutter, etc.

[0071] In the above embodiment, a structure in which a pair of shearing blades 12 are supported on a housing 14 has been described. Alternatively, the structure could also include a support rod (not shown) supporting the housing 14 at its rear end and a front housing supporting the front end of the support rod, with the shearing blades 12 supported in the front housing.

[0072] In the above embodiments, a structure in which a pair of shearing blades 12 reciprocate is described. However, a structure in which only one of the pair of shearing blades 12 reciprocates is also possible.

[0073] In the above embodiments, a structure including motor 26 was described as an example of a prime mover. The prime mover may also be something other than motor 26. For example, the prime mover may also be an engine.

[0074] The above embodiments illustrate a structure in which the working machine (hedge cutter 100) includes a power cord 20, through which power is supplied to the hedge cutter 100 from the outside. Alternatively, the working machine (hedge cutter 100) may include a battery pack (not shown) detachable from the rear handle 18, from which power is supplied to the working machine (hedge cutter 100).

[0075] In the above embodiment, the structure of the prime mover (motor 26) being a brushless motor has been described. However, the prime mover (motor 26) may also be a motor other than a brushless motor. For example, the prime mover (motor 26) may also be a brushed motor, etc.

[0076] In the above embodiment, a structure in which the rotation axis X is slightly inclined relative to the front-rear direction has been described. The rotation axis X may also be parallel to the front-rear direction, which is different from this.

[0077] In the above embodiment, a structure in which four elastic members (rubber pins 36) are provided in the joint 142 has been described. However, the number of elastic members (rubber pins 36) provided in the joint 142 is not limited to four; any number is possible.

[0078] In the above embodiments, a structure in which the elastic member (rubber pin 36) is generally cylindrical has been described. The elastic member (rubber pin 36) may also be configured in a shape other than generally cylindrical. For example, the elastic member (rubber pin 36) may also be spherical.

[0079] In the above embodiments, the structure in which each elastic member (rubber pin 36) is formed as a separate component has been described. However, each elastic member (rubber pin 36) may also be formed as an integral component connected to an O-ring-shaped elastic member (not shown) at its front end. In this case, the rear end portion of each elastic member (rubber pin 36) constitutes multiple abutment portions that abut against the opposing surface 184a.

[0080] In the above embodiments, a structure has been described in which the housing 14 includes a connecting portion 142 and the handle 18 includes a protrusion 182. Alternatively, the structure may also be different, with the housing 14 including the protrusion 182 and the handle 18 including the connecting portion 142.

[0081] In the above embodiment, the structure is described as follows: the outer surface 184c of the shaft portion 182c tapers in diameter as it moves toward the rearward direction; the opposing surfaces 144a and 184a are arranged opposite each other at a first interval Y in the direction of the rotation axis X; the rear end portion of the elastic member (rubber pin 36) protrudes rearward relative to the opposing surface 144a at the opposing surface 144a of the housing 14, such that when the housing 14 is engaged with the rear handle 18, the rear end portion of the elastic member (rubber pin 36) abuts against the opposing surface 184a. Alternatively, it may be arranged differently as follows... Figure 13 As shown, the outer surface 184c of the shaft portion 182c tapers in diameter as it moves forward (first direction). Alternatively, the opposing surfaces 144b and 184b may be positioned opposite each other in the direction of the rotation axis X, separated by a second interval Y'. Alternatively, the front end of the elastic member (rubber pin 36) may protrude forward relative to the opposing surface 144b at the opposing surface of the housing 14, with the front end of the elastic member (rubber pin 36) abutting against the opposing surface 184b when the housing 14 is engaged with the rear handle 18. The second interval Y' may be 1 mm or less. In this embodiment, the second interval Y' is 0.8 mm.

[0082] In the above embodiment, the structure in which the outer surface 184c of the shaft portion 182c narrows as it moves toward any direction in the direction of the rotation axis X has been described. It is also possible to do something different, such as... Figure 14 As shown, the diameter of the outer surface 184c of the shaft portion 182c is constant along the rotation axis X direction.

[0083] In the above embodiment, the structure in which the elastic member (rubber pin 36) is housed in the receiving groove 144d formed in the housing 14 has been described. However, a different approach may be taken, such as... Figure 15 As shown, the elastic member (rubber pin 36) is housed in the storage groove 184d formed in the rear handle 18.

[0084] In the above embodiment, a structure in which the elastic member (rubber pin 36) is installed between opposing surfaces 144a (or opposing surface 144b) and opposing surfaces 184a (or opposing surface 184b) that are spaced apart from each other in the direction of the rotation axis X has been described. Alternatively, a structure could be described as follows: Figure 16 As shown, an elastic member (rubber pin 36) is provided between the engaging surface 144c and the outer surface 184c, which are spaced apart from each other in a direction orthogonal to the rotation axis X. The elastic member (rubber pin 36) can be discretely arranged in the circumferential direction of the rotation axis X. In this case, for example, if an elastic member with a continuous abutment portion in the circumferential direction of the rotation axis X, such as an O-ring (not shown), is provided, the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 increases. Figure 16 In the case of the structure shown, the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 is reduced by the elastic members (rubber pins 36) discretely arranged in the circumferential direction.

[0085] In the above embodiments, the structure of opposing surfaces 144a, 144b, 184a, and 184b being surfaces perpendicular to the rotation axis X has been described. However, opposing surfaces 144a, 144b, 184a, and 184b may also be surfaces other than those perpendicular to the rotation axis X.

[0086] (Correspondence)

[0087] As described above, in one or more embodiments, the hedge trimmer 100 (an example of a working machine) includes: a pair of shearing blades 12 (an example of a working unit); a motor 26 (an example of a prime mover) for driving the pair of shearing blades 12; a housing 14 for supporting the pair of shearing blades 12; a rear handle 18 mounted on the housing 14 in a manner rotatable relative to the housing 14 about a rotation axis X, and for gripping by a user; and a rubber pin 36 (an example of an elastic member) disposed between the housing 14 and the rear handle 18. The housing 14 includes opposing surfaces 144a (or 144b) (an example of a first surface). The rear handle 18 includes opposing surfaces 184a (or 184b) spaced apart from opposing surfaces 144a (or 144b) in the direction of the rotation axis X (an example of a second surface). The rubber pin 36 is disposed between opposing surfaces 144a (or 144b) and 184a (or 184b).

[0088] According to the above structure, the wobbling between the rear handle 18 and the housing 14 can be suppressed by using the rubber pin 36 disposed between the opposing surfaces 144a (or 144b) and 184a (or 184b). Since the rear handle 18 is mounted in the housing 14 of the hedge trimmer 100 in a manner that allows it to rotate relative to the housing 14, the wobbling generated between the rear handle 18 and the housing 14 can be reduced. Furthermore, according to the above structure, since the rubber pin 36 is disposed between the opposing surfaces 144a (or 144b) and 184a (or 184b) which are spaced apart in the rotation axis X direction, the wobbling in the rotation axis X direction between the rear handle 18 and the housing 14 can be suppressed.

[0089] In one or more embodiments, one of the housing 14 and the rear handle 18 includes a shaft portion 182c having an outer surface portion 184c that tapers in diameter toward a first direction (rearward or forward) along the rotation axis X. The other of the housing 14 and the rear handle 18 includes an engagement surface 144c (an example of an engagement portion) that engages with the outer surface portion 184c of the shaft portion 182c in the first direction (rearward or forward). Opposing surfaces 144a (or 144b) and 184a (or 184b) are positioned in the rotation axis X direction on the side closer to the engagement surface 144c in the first direction (rearward or forward).

[0090] According to the above structure, the engagement of the outer surface 184c of the shaft portion 182c and the engaging surface 144c suppresses movement of one of the housing 14 and the rear handle 18 relative to the other in a first direction (rearward or forward). The rubber pin 36 suppresses movement of one of the housing 14 and the rear handle 18 relative to the other in the opposite direction (rearward or forward). Furthermore, the engagement of the outer surface 184c of the shaft portion 182c and the engaging surface 144c suppresses movement of one of the housing 14 and the rear handle 18 relative to the other in a direction orthogonal to the rotation axis X. With this structure, wobble between the rear handle 18 and the housing 14 can be effectively reduced.

[0091] In one or more embodiments, the rubber pins 36 (rubber pins 36a, 36b, 36c, 36d) are discretely arranged in the circumferential direction of the rotation axis X, including rear end portions (or front end portions) of the rubber pins 36a, 36b, 36c, 36d that are capable of abutting against the opposing surface 144a (or opposing surface 144b) or the opposing surface 184a (or opposing surface 184b). (Example of multiple abutment portions)

[0092] According to the above structure, the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 can be reduced. Therefore, it becomes easier for the user to rotate the rear handle 18.

[0093] In one or more embodiments, the hedge trimmer 100 includes: a pair of shearing blades 12; a motor 26 for driving the pair of shearing blades 12; a housing 14 for supporting the pair of shearing blades 12; a rear handle 18 mounted on the housing 14 in a manner rotatable relative to the housing 14 about a rotation axis X, and capable of being gripped by a user; and a rubber pin 36 disposed between the housing 14 and the rear handle 18. The housing 14 includes opposing surfaces 144a (or opposing surfaces 144b, engaging surfaces 144c) (example of the first side). The rear handle 18 includes opposing surfaces 184a (or opposing surfaces 184b, outer surfaces 184c) spaced apart from opposing surfaces 144a (or opposing surfaces 144b, engaging surfaces 144c) (example of the second side). The rubber pin 36 is disposed between opposing surfaces 144a (or opposing surfaces 144b, engaging surfaces 144c) and opposing surfaces 184a (or opposing surfaces 184b, outer surfaces 184c). The rubber pins 36 are discretely arranged in the circumferential direction of the rotation axis X, including the rear end portion (or front end portion) of the rubber pins 36a, 36b, 36c, 36d that can abut against the opposing surface 144a (or opposing surface 144b, engaging surface 144c) or the opposing surface 184a (or opposing surface 184b, outer surface 184c).

[0094] According to the above structure, the rubber pin 36 disposed between the opposing surface 144a (or opposing surface 144b, engaging surface 144c) and the opposing surface 184a (or opposing surface 184b, outer surface 184c) can suppress the wobbling between the rear handle 18 and the housing 14. In the hedge trimmer 100, the rear handle 18 is mounted in a manner that allows it to rotate relative to the housing 14, reducing the wobbling generated between the rear handle 18 and the housing 14. Furthermore, according to the above structure, the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 can be reduced. Therefore, rotating the rear handle 18 becomes easier for the user.

[0095] In one or more embodiments, when viewed from the rotation axis X direction, the rotation axis X is disposed inside a convex polygon with the center of each of the rear (or front) portions of the rubber pins 36a, 36b, 36c, and 36d as its vertex.

[0096] According to the above structure, since the rear (or front) portions of the rubber pins 36a, 36b, 36c, and 36d are configured to surround the rotation axis X, the wobble between the rear handle 18 and the housing 14 can be effectively reduced.

[0097] In one or more embodiments, the rear (or front) portions of the rubber pins 36a, 36b, 36c, and 36d are respectively rounded (including examples of abutment surfaces with rounded surfaces).

[0098] If any of the rear (or front) portions of the rubber pins 36a, 36b, 36c, and 36d are flat (including examples with flat abutment surfaces), when the rear handle 18 rotates relative to the housing 14, this rear (or front) portion may come into contact with one end of the opposing surface 144a (or opposing surface 144b) or opposing surface 184a (or opposing surface 184b), potentially generating significant sliding resistance. According to the above structure, since the rubber pins 36a, 36b, 36c, and 36d are rounded, the sliding resistance generated when the rear handle 18 rotates relative to the housing 14 can be reduced. Therefore, user comfort can be improved.

[0099] In one or more embodiments, the rubber pin 36 includes rubber pins 36a, 36b, 36c, 36d (examples of multiple elastic cylindrical members) having a generally cylindrical shape along the rotation axis X. The rear end portions (or front end portions) of the rubber pins 36a, 36b, 36c, 36d are respectively provided in their respective corresponding rubber pins in the rubber pins 36a, 36b, 36c, 36d.

[0100] Based on the above structure, the rubber pin 36 can be easily formed and can be easily assembled to the housing 14 or the rear handle 18.

[0101] In one or more embodiments, motor 26 is a brushless motor (an example of an electric motor).

[0102] In the hedge trimmer 100 that uses a brushless motor as motor 26, compared to the hedge trimmer 100 that uses an engine as motor 26, the vibration generated by the drive of motor 26 is smaller. Therefore, the wobble between the rear handle 18 and the housing 14 has a greater impact on the user's experience. According to the above structure, since the wobble between the rear handle 18 and the housing 14 can be suppressed, the user's comfort can be improved.

Claims

1. A type of operating machinery, wherein, The operating machinery includes: Operations Department; Prime mover, which drives the working unit; A housing for supporting the working part; A handle, which is mounted to the housing in a manner rotatable relative to the housing about a rotation axis, and is designed for a user to hold; and An elastic member is disposed between the housing and the handle. The housing includes a first surface. The handle includes a second surface that is spaced apart from the first surface in the direction of the rotation axis. The elastic member is disposed between the first surface and the second surface in the direction of the rotation axis. With the housing and handle engaged, the elastic member is in a state of contraction in the direction of the rotation axis, having previously been in its natural state. One of the housing and the handle includes a shaft portion having an outer surface that tapers in diameter as it moves toward a first direction along the axis of rotation. The other of the housing and the handle includes an engagement portion that engages with the outer side of the shaft in the first direction. The first surface and the second surface are arranged in the direction of the rotation axis at a position closer to the first direction side than the engaging portion.

2. The operating machinery according to claim 1, wherein, The elastic member is discretely arranged in the circumferential direction of the rotation axis and includes a plurality of abutting portions capable of abutting against the first surface or the second surface.

3. The operating machinery according to claim 2, wherein, When viewed from the direction of the rotation axis, the rotation axis is located inside a convex polygon with the center of each of the plurality of abutments as its vertex.

4. The operating machinery according to claim 2, wherein, The plurality of abutting parts each include abutting surfaces with rounded shapes.

5. The operating machinery according to claim 2, wherein, The elastic member comprises a plurality of elastic cylindrical members having a generally cylindrical shape along the axis of rotation. The plurality of abutting portions are respectively disposed in their respective corresponding elastic cylindrical components among the plurality of elastic cylindrical components.

6. The operating machinery according to claim 1, wherein, The prime mover is an electric motor.

7. A type of operating machinery, wherein, The operating machinery includes: Operations Department; Prime mover, which drives the working unit; A housing for supporting the working part; A handle, which is mounted to the housing in a manner rotatable relative to the housing about a rotation axis, and is designed for a user to hold; and An elastic member is disposed between the housing and the handle. The housing includes a first surface. The handle includes a second surface that is spaced apart from the first surface and opposite it. The elastic member is disposed between the first surface and the second surface. The elastic member is discretely arranged circumferentially along the axis of rotation, and includes a plurality of abutment portions capable of abutting against the first surface or the second surface. When viewed from the direction of the rotation axis, the rotation axis is located inside a convex polygon with the center of each of the plurality of abutment portions as its vertex. One of the housing and the handle includes a shaft portion having an outer surface that tapers in diameter as it moves toward a first direction along the axis of rotation. The other of the housing and the handle includes an engagement portion that engages with the outer side of the shaft in the first direction. The first surface and the second surface are arranged in the direction of the rotation axis at a position closer to the first direction side than the engaging portion.

8. The operating machinery according to claim 7, wherein, The plurality of abutting parts each include abutting surfaces with rounded shapes.

9. The operating machinery according to claim 7 or 8, wherein, The elastic member comprises a plurality of elastic cylindrical members having a generally cylindrical shape along the axis of rotation. The plurality of abutting portions are respectively disposed in their respective corresponding elastic cylindrical components among the plurality of elastic cylindrical components.

10. The operating machinery according to claim 7 or 8, wherein, The prime mover is an electric motor.

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