Handle structure

Abstract

Provided is a handle structure which is advantageous for miniaturization of a case and can suppress an increase in cost due to additional processing of a handle pipe.　A handle pipe 21 has a pipe through-hole 21h through which a fastening member 51 penetrates. A case 31 includes a first case 32a and a second case 32b. The first case 32a is provided with a first receiving part 33a having a case through-hole 33h through which the fastening member 51 penetrates. A head 51a of the fastening member 51 penetrating through the case through-hole 33h abuts against the first receiving part 33a. The second case 32b is provided with a second receiving part 33b having a fastening part 33b2 to which the fastening member 51 is fastened. In a state in which the handle pipe 21 is sandwiched between the first receiving part 33a and the second receiving part 33b, the fastening member 51 passed through the pipe through-hole 21h from the case through-hole 33h side is fastened to the fastening part 33b2.

Description

Handle structure

[0001] The present invention relates to a handle structure.

[0002] A known handlebar structure for saddle-ride type vehicles employs a handlebar pipe sandwiched between two halves of a case, and the cases are fastened together with a bolt that passes through the outside of the case (see, for example, Patent Document 1). A structure has also been proposed for this type of vehicle handlebar structure, in which the case is secured by fastening a bolt to the case (see, for example, Patent Document 2). Patent Document 2 uses a tapered thread for the bolt, which is fastened directly to the case.

[0003] Japanese Utility Model Publication No. 61-032867 Japanese Utility Model Publication No. 59-005481

[0004] However, the technology described in Patent Document 1 fastens the cases together with bolts that pass through the outside of the handle pipes, which may result in an increase in the size of the cases. Furthermore, the technology described in Patent Document 2 fastens tapered threads to the handle pipes, which requires the work of machining tapered screw holes in the handle pipes. This requires additional machining of the handle pipes, which may result in increased costs. The present invention has been made in light of the above-mentioned circumstances, and aims to provide a handle structure that is advantageous for reducing the size of the cases and that can suppress the increase in costs due to additional machining of the handle pipes.

[0005] This specification includes the entire contents of Japanese Patent Application No. 2024-022022, filed on February 16, 2024. This handle structure includes a handle pipe, a case fixed to the handle pipe, and a grip that is rotatable relative to the case, wherein the handle pipe has a pipe through hole through which a fastening member passes, the case has a first case and a second case, the first case has a case through hole through which the fastening member passes and is equipped with a first receiving portion against which a head of the fastening member that has passed through the case through hole abuts, and the second case is equipped with a second receiving portion having a fastening portion to which the fastening member is fastened, and with the handle pipe sandwiched between the first receiving portion and the second receiving portion, the fastening member that has passed through the pipe through hole from the case through hole side is fastened to the fastening portion.

[0006] According to the present invention, it is possible to provide a handle structure that is advantageous in reducing the size of the case and in suppressing an increase in the cost of the handle pipe.

[0007] Fig. 1 is a diagram showing an example of a saddle-ride type vehicle equipped with a handle structure according to an embodiment of the present invention. Fig. 2 is a perspective view showing an accelerator grip together with the surrounding configuration. Fig. 3 is a diagram showing the accelerator grip together with the surrounding configuration from above. Fig. 4 is a diagram showing the case together with the surrounding configuration from the inside in the vehicle width direction. Fig. 5 is a VV cross-sectional view of Fig. 4. Fig. 6 is a diagram showing the case fixed by fastening members.

[0008] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the description, directions such as front, rear, left, right, up and down are the same as directions relative to the vehicle body unless otherwise specified. In addition, the symbol FR in each drawing indicates the front of the vehicle body, the symbol UP indicates the upper side of the vehicle body, and the symbol LH indicates the left side of the vehicle body.

[0009] 1 is a diagram showing an example of a saddle-ride type vehicle equipped with a handle structure according to an embodiment of the present invention. The saddle-ride type vehicle 10 includes a seat 11 on which a rider sits, handlebars 12 gripped by the rider seated on the seat 11, a front fork 14 supporting a front wheel 13 so as to be steerable, a swing arm 16 supporting a rear wheel 15, a body frame (not shown) supporting the seat 11, the front fork 14, the swing arm 16, etc., a body cover 18 covering the body frame, etc.

[0010] The saddle-ride type vehicle 10 is an electric vehicle that has an electric motor that functions as a drive source within a swing arm 16 located on the left side of the rear wheel 15, and that drives the rear wheel 15 by this electric motor. The saddle-ride type vehicle 10 is configured as a scooter-type motorcycle that has a low step floor 19. Note that FIG. 1 shows an example of a vehicle to which the present invention can be applied, and the vehicle may be a motorcycle other than a scooter. Furthermore, the drive source is not limited to an electric motor, and the vehicle may be equipped with a drive source other than an electric motor, for example, an internal combustion engine.

[0011] The handlebars 12 have a handle pipe 21 supported on the upper part of the front fork 14. The handle pipe 21, also called a handlebar, is made of a rigid pipe material with a circular cross section, such as a metal pipe. The left and right central portions of the handle pipe 21 are covered by a handle cover 18h. An accelerator grip 22 that the rider (passenger) holds with his / her right hand is provided at the right end of the handle pipe 21. The accelerator grip 22, also called a throttle grip, is rotatable relative to the handle pipe 21. A front wheel brake lever 23 is disposed in front of the accelerator grip 22. Although not shown, a grip portion that the rider holds with his / her left hand is provided at the left end of the handle pipe 21. A rear wheel brake lever 25 is disposed in front of the left grip portion.

[0012] Fig. 2 is a perspective view showing the accelerator grip 22 together with the surrounding configuration. Fig. 3 is a view showing the accelerator grip 22 together with the surrounding configuration from above. Note that Figs. 2 and 3 show the central axis CT of the handle pipe 21, and the handle pipe 21 is not shown. As shown in Figs. 2 and 3, a case 31 fixed to the handle pipe 21 is provided around the accelerator grip 22. The case 31 has a flange shape that protrudes circumferentially outward from the accelerator grip 22 at the base end of the accelerator grip 22.

[0013] The case 31 includes a case body 32 that houses the rotation amount detection mechanism 22k (FIG. 5) of the accelerator grip 22, and a pair of receiving portions 33a, 33b that extend from the case body 32 toward the inside in the vehicle width direction along the outer shape of the handle pipe 21. The case body 32 has a window portion 34 that exposes the connector 2ct on the surface opposite the accelerator grip 22 (the surface on the inside in the vehicle width direction).

[0014] The connector 2ct is connected to a sensor (rotation amount detection sensor or throttle sensor, not shown) included in the rotation amount detection mechanism 22k. A cable 41 extending from an ECU (Electronic Control Unit) of the saddle-ride type vehicle, which is arranged outside the case 31, is connected to the connector 2ct. This enables the ECU of the saddle-ride type vehicle to detect the amount of rotation of the accelerator grip 22, etc.

[0015] FIG. 4 is a view showing the case 31 from the inside in the vehicle width direction, along with the peripheral configuration. FIG. 5 is a cross-sectional view taken along the V-V line in FIG. 4. As shown in FIG. 4, the case main body 32 includes a first case 32a and a second case 32b, which are divided along parting lines BL1 and BL2 shown in FIG. 4. The first case 32a integrally includes a case portion (including the front upper and rear upper portions of the case main body 32) above the parting lines BL1 and BL2 and one receiving portion 33a (hereinafter referred to as the first receiving portion 33a). The second case 32b integrally includes a case portion (including the front lower and rear lower portions of the case main body 32) below the parting lines BL1 and BL2 and the other receiving portion 33b (hereinafter referred to as the second receiving portion 33b). The materials for the cases 32a and 32b are not particularly limited. For example, the cases 32a and 32b can be easily manufactured by resin molding.

[0016] As shown in Figure 5, the accelerator grip 22 has a cylindrical accelerator grip body 22a, with a grip member 22b attached to the outer periphery of the accelerator grip body 22a. The accelerator grip body 22a also has an extension 22c that extends more inward in the vehicle width direction than the grip member 22b, and at least some of the components of the rotation amount detection mechanism 22k are provided on this extension 22c. As shown in Figure 5, the first case 32a and the second case 32b are fixed to the handle pipe 21 so as to cover the extension 22c and the rotation amount detection mechanism 22k.

[0017] As shown in FIG. 2 , the first receiving portion 33a of the first case 32a includes a first receiving portion main body 33a1 extending inward in the vehicle width direction from the case portion of the first case 32a and a through-hole portion 33a2 having a hole 33h (hereinafter referred to as the case through-hole 33h) penetrating the first receiving portion main body 33a1. The first receiving portion main body 33a1 is formed in a shape that extends inward in the vehicle width direction with a cross-sectional shape that curves along the outer shape of the handlebar pipe 21. In this configuration, the inner surface of the first receiving portion main body 33a1 is formed in an arc shape that follows the outer surface of the handlebar pipe 21 in a side view. As shown in FIG. 4 , when the first case 32a is fixed to the handlebar pipe 21, it abuts against the outer surface of the handlebar pipe 21. This stabilizes the first case 32a relative to the handlebar pipe 21.

[0018] The case through-hole 33h is formed as a hole through which the fastening member 52 shown in Fig. 2 can pass. In this configuration, the first receiving portion body 33a1 is provided outside the first receiving portion body 33a1, so the case through-hole 33h provided in the first receiving portion body 33a1 can be easily seen from the outside. This makes it easy to move the first case 32a to a position where the first receiving portion body 33a1 abuts against the outer surface of the handle pipe 21 and to pass the fastening member 52 through the case through-hole 33h.

[0019] The through-hole portion 33a2 protrudes from the first receiving portion main body 33a1 toward the opposite side of the handlebar pipe 21, and a metal collar 45 is fixed therein by press-fitting, insert molding, or the like. The center hole of this collar 45 forms the case through-hole 33h. The case through-hole 33h has a diameter approximately the same as the large-diameter portion 51b of the fastening member 51 shown in FIG. 2 and abuts against the large-diameter portion 51b inserted through the case through-hole 33h. The end surface 33M (the upper surface in this embodiment) of the through-hole portion 33a2 is formed as a flat portion. Furthermore, the end surface 33M is inclined with respect to the vertical direction. This facilitates the rapid flow of rainwater and other water adhering to the end surface 33M out of the through-hole portion 33a2.

[0020] As shown in FIG. 2 , the second receiving portion 33b of the second case 32b includes a second receiving portion main body 33b1 extending inward in the vehicle width direction from the case portion of the second case 32b, and a fastening portion 33b2 provided on the second receiving portion main body 33b1. Like the first receiving portion main body 33a1, the second receiving portion main body 33b1 is formed with a cross-sectional shape that curves along the outer shape of the handlebar pipe 21 and extends inward in the vehicle width direction, and the inner surface of the second receiving portion main body 33b1 is formed into an arc shape that follows the outer surface of the handlebar pipe 21 in a side view. As shown in FIG. 4 , the inner surface of the second receiving portion main body 33b1 abuts against the outer surface of the handlebar pipe 21 when the second case 32b is fixed to the handlebar pipe 21. This stabilizes the second case 32b relative to the handlebar pipe 21.

[0021] The fastening portion 33b2 has a female thread to which the threaded portion (male thread 51c shown in FIG. 2) of the fastening member 51 is fastened. Here, as shown in FIG. 5, a hole 21h (hereinafter referred to as pipe through hole 21h) through which the fastening member 52 passes is formed in the handle pipe 21. The pipe through hole 21h is formed to be a hole through which the fastening member 52 shown in FIG. 2 can pass. More specifically, the pipe through hole 21h is formed to be a hole with approximately the same diameter as the large diameter portion 51b of the fastening member 51.

[0022] 6 is a diagram showing the state in which the case 31 is fixed by the fastening member 51. As shown in FIGS. 2 and 6 , the fastening member 51 has a stepped screw structure integrally including a head 51a, a large-diameter portion 51b, and a male thread 51c having a diameter smaller than that of the large-diameter portion 51b, and is also called a shoulder screw or a shoulder bolt. The head 51a is located on the proximal end side of the large-diameter portion 51b and has a larger diameter than that of the large-diameter portion 51b, allowing the fastening member 51 to be tightened with a tool (e.g., a Phillips head screwdriver) (not shown). The male thread 51c is located on the distal end side of the large-diameter portion 51b and is a thread without a taper.

[0023] 6, the case through-hole 33h of the first receiving portion 33a, the pipe through-hole 21h of the handle pipe 21, and the fastening portion 33b2 of the second receiving portion 33b are aligned coaxially, and in this state, the fastening member 51 is inserted from the case through-hole 33h side, and the male thread 51c of the fastening member 51 is fastened to the fastening portion 33b2. In this case, the first case 32a and the second case 32b are fixed to the handle pipe 21 by the fastening member 51. In this case, the large diameter portion 51b of the fastening member 51 abuts against the case through-hole 33h, so the fastening member 51 and the case 31 are integrated, ensuring the attachment strength between the case 31 and the handle pipe 21 and improving durability.

[0024] 6, the first receiving portion 33a is located on the upper side of the handle pipe 21, which makes it easy to insert the fastening member 51 into the case through-hole 33h of the first receiving portion 33a. Furthermore, since the head 51a of the fastening member 51 can be brought into contact with the first receiving portion 33a from above, it is possible to effectively prevent rainwater or the like from entering the case through-hole 33h of the first receiving portion 33a from above when the vehicle is stopped, for example.

[0025] 4, the fastening member 51 passes through the pipe through-hole 21h from the case through-hole 33h side and is fastened to the fastening portion 33b2 in a state inclined with respect to the vertical direction of the handle pipe 21. Here, Fig. 4 shows a vertical line L1 that passes through the central axis CT of the handle pipe 21 and extends in the up-down direction (vertical direction) of the vehicle body, and also shows a fore-aft line L2 that passes through the central axis CT and extends in the fore-aft direction of the vehicle body.

[0026] 4, the fastening member 51 secures the case 31 and the handlebar pipe 21 in a state in which it is tilted forward with respect to the vertical direction of the handlebar 12, so that the first receiving portion 33a is located on the upper and front side of the handlebar pipe 21. By having the first receiving portion 33a located on the front side of the handlebar pipe 21, the head 51a of the fastening member 51 can be brought into contact with the first receiving portion 33a from the front, which effectively prevents rainwater and the like from entering the case through-hole 33h of the first receiving portion 33a from the front while the vehicle is traveling, etc.

[0027] It should be noted that the first receiving portion 33a does not have to be positioned on the upper and front side of the handle pipe 21. For example, the first receiving portion 33a may be positioned only on the front side of the handle pipe 21. Furthermore, the fastening member 51 may be configured to fix the case 31 and the handle pipe 21 in a state in which it is tilted rearward with respect to the vertical direction of the handlebars 12. When the fastening member 51 is tilted rearward, the first receiving portion 33a is positioned on the upper and rear side of the handle pipe 21, which effectively prevents rainwater and the like from above and front from entering the case through-hole 33h.

[0028] As described above, in this embodiment, the handle structure includes a handle pipe 21, a case 31 fixed to the handle pipe 21, and an accelerator grip 22 rotatable relative to the case 31. The handle pipe 21 has a pipe through hole 21h through which a fastening member 51 passes, and the case 31 has a first case 32a and a second case 32b. The first case 32a has a case through hole 33h through which the fastening member 51 passes and a first receiving portion 33a against which a head 51a of the fastening member 51 passing through the case through hole 33h abuts. The second case 32b has a second receiving portion 33b having a fastening portion 33b2 to which the fastening member 51 is fastened. With the handle pipe 21 sandwiched between the first receiving portion 33a and the second receiving portion 33b, the fastening member 51 passed through the pipe through hole 21h from the case through hole 33h side is fastened to the fastening portion 33b2.

[0029] According to these configurations, the fastening members 51 used to secure the case 31 to the handle pipe 21 are passed through the handle pipe 21, which is advantageous for reducing the size of the case 31. Furthermore, the heads 51a of the fastening members 51 are received by the first receiving portions 33a of the first case 32a, and the fastening members 51 are fastened to the second receiving portions 33b, so additional work related to fastening is not required on the handle pipe 21 side, and it is easier to prevent rainwater and the like from entering. Therefore, it is possible to provide a handle structure that is advantageous for reducing the size of the case 31 and that can, for example, prevent an increase in cost due to additional work on the handle pipe 21.

[0030] Furthermore, since the first receiving portion 33a is located on the upper side of the handle pipe 21, it is easy to insert the fastening member 51. Moreover, since the head 51a of the fastening member 51 can be brought into contact with the first receiving portion 33a from above, it is possible to effectively prevent rainwater or the like from above from entering the case through-hole 33h of the first receiving portion 33a.

[0031] Furthermore, the fastening member 51 passes through the pipe through hole 21h from the case through hole 33h side and is fastened to the fastening portion 33b2 in a state inclined with respect to the vertical direction of the handle pipe 21. With this configuration, for example, as shown in Figure 4, the first receiving portion 33a can be positioned on the upper and front side of the handle pipe 21, which effectively prevents rainwater and the like from above or from the front from entering the case through hole 33h.

[0032] 4 and other figures, the first receiving portion 33a has a flat portion at a portion (corresponding to the end surface 33M) that contacts the fastening member 51, and the flat portion is inclined relative to the vertical direction. This configuration makes it easier for rainwater and the like adhering to the flat portion to quickly flow out of the case through-hole 33h.

[0033] The handle pipe 21 has a circular cross section, and the surface of the first receiving portion 33a that comes into contact with the handle pipe 21 has an arc shape that follows the surface of the handle pipe 21. With this configuration, the first case 32a is stable relative to the handle pipe 21, improving the stability of the case 31.

[0034] The fastening member 51 has a stepped screw structure, and the large-diameter portion 51b, which is the unthreaded portion, abuts against the inner surface of the case through-hole 33h. With this configuration, the fastening member 51 and the case 31 are integrated, ensuring the attachment strength between the case 31 and the handle pipe 21 and improving durability.

[0035] Additionally, a metal collar 45 through which the fastening member 51 passes is provided in the case through-hole 33h. With this configuration, the combination of the metal collar and the shoulder screw allows the shoulder screw to function as a positioning pin, enabling installation with less backlash (the gap between the case through-hole 33h and the shoulder screw). Furthermore, the durability of the case through-hole 33h can be improved. Alternatively, a metal collar through which the fastening member 51 passes may be provided in the fastening portion 33b2. In this case, the durability of the fastening portion 33b2 can be improved.

[0036] Other Embodiments The above-described embodiment merely shows one aspect of the present invention, and any modifications and applications are possible without departing from the spirit of the present invention.

[0037] In the above embodiment, the case 31 is described as a case that houses the rotation amount detection mechanism 22k, but the present invention is not limited to this, and any case that is fixed to the handle pipe 21 can be widely applied as the case 31. For example, the case 31 may be a switch case in which an operation switch is arranged, or a case that constitutes a brake master cylinder. The shape and structure of the case 31 may be changed as appropriate. For example, the case 31 is not limited to a configuration in which the first case 32a and the second case 32b are completely separate, and may be configured as a so-called split case in which the first case 32a and the second case 32b are partially connected.

[0038] In the above embodiment, the present invention is applied to the handle structure of the saddle-ride type vehicle 10 shown in Fig. 1, but the present invention may be applied to the handle structure of any saddle-ride type vehicle. The saddle-ride type vehicle is not limited to a motorcycle, but may be a three-wheeled vehicle or a vehicle with four or more wheels. The handle structure of the present invention may be applied to any device having a structure in which the case 31 is fixed to the handle pipe 21, and for example, the present invention may be applied to devices other than vehicles.

[0039] [Configurations Supported by the Above-described Embodiments] The above-described embodiments support the following configurations.

[0040] (Configuration 1) A handle structure including a handle pipe, a case fixed to the handle pipe, and a grip rotatable relative to the case. The handle pipe has a pipe through-hole through which a fastening member passes, and the case includes a first case and a second case. The first case has a case through-hole through which the fastening member passes and a first receiving portion against which a head of the fastening member passing through the case through-hole abuts, and the second case has a second receiving portion having a fastening portion to which the fastening member is fastened. With the handle pipe sandwiched between the first and second receiving portions, the fastening member passed through the pipe through-hole from the case through-hole side is fastened to the fastening portion. This configuration is advantageous for miniaturizing the case because the fastening member used to secure the case to the handle pipe is passed through the handle pipe. Because the head of the fastening member is received in the first receiving portion of the first case and the fastening member is fastened to the second receiving portion, no additional fastening work is required on the handle pipe. Therefore, it is possible to provide a handle structure that is advantageous in reducing the size of the case 31 and that can suppress increases in costs due to additional processing of the handle pipe 21.

[0041] (Configuration 2) The handle structure according to Configuration 1, wherein the first receiving portion is located on the upper side of the handle pipe. This configuration facilitates the insertion of a fastening member. Furthermore, since the head of the fastening member can be brought into contact with the first receiving portion from above, it is possible to effectively prevent rainwater or the like from entering the case through-hole of the first receiving portion from above.

[0042] (Configuration 3) The handle structure according to Configuration 1 or 2, wherein the fastening member 51 passes through the pipe through hole 21h from the case through hole 33h side and is fastened to the fastening portion 33b2 in a state inclined with respect to the vertical direction of the handle pipe 21. According to this configuration, for example, the first receiving portion can be positioned on the upper and front side of the handle pipe, which can effectively prevent rainwater or the like from entering the case through hole from above or the front.

[0043] (Configuration 4) The handle structure according to any one of Configurations 1 to 3, wherein the first receiving portion is located on the front side of the handle pipe. With this configuration, the head of the fastening member can be brought into contact with the first receiving portion from the front, effectively preventing rainwater or the like from entering the case through-hole from the front.

[0044] (Configuration 5) The handle structure according to any one of Configurations 1 to 4, wherein the first receiving portion has a flat portion at a portion that contacts the fastening member, and the flat portion is inclined with respect to the vertical direction. With this configuration, rainwater or the like adhering to the flat portion can be easily swiftly drained out of the case through-hole.

[0045] (Configuration 6) The handle structure according to any one of Configurations 1 to 5, wherein the handle pipe has a circular cross section, and the surface of the first receiving portion that contacts the handle pipe has an arc shape. With this configuration, the first case is stabilized relative to the handle pipe, improving the stability of the case.

[0046] (Configuration 7) The handle structure according to any one of Configurations 1 to 6, wherein the fastening member has a stepped screw structure, and the unthreaded portion abuts against the inner surface of the case through hole. With this configuration, the fastening member and the case are integrated, ensuring the attachment strength between the case and the handle pipe and improving durability.

[0047] (Configuration 8) The case through-hole is provided with a metal collar through which the fastening member passes. With this configuration, the combination of the metal collar and the shoulder screw allows the shoulder screw to function as a positioning pin, enabling installation with less backlash. Furthermore, the durability of the case through-hole can be improved.

[0048] REFERENCE SIGNS LIST 10 saddle-ride type vehicle 21 handle pipe 21h pipe through-hole 22 accelerator grip (grip) 31 case 32a first case 32b second case 33a first receiving portion 33a2 through-hole portion 33b second receiving portion 33b2 fastening portion 33h case through-hole 33M end face of through-hole portion 45 collar 51 fastening member 51a head portion 51b large diameter portion (non-threaded portion) 51c male screw

Claims

1. A handle structure comprising a handle pipe (21), a case (31) fixed to the handle pipe (21), and a grip (22) rotatable relative to the case (31), wherein the handle pipe (21) has a pipe through-hole (21h) through which a fastening member (51) passes, the case (31) has a first case (32a) and a second case (32b), the first case (32a) has a case through-hole (33h) through which the fastening member (51) passes and is provided with a first receiving portion (33a) against which a head (51a) of the fastening member (51) passing through the case through-hole (33h) abuts, The second case (32b) is provided with a second receiving portion (33b) having a fastening portion (33b2) to which the fastening member (51) is fastened, and with the handle pipe (21) sandwiched between the first receiving portion (33a) and the second receiving portion (33b), the fastening member (51) passed through the pipe through hole (21h) from the case through hole (33h) side is fastened to the fastening portion (33b2).

2. A handle structure as set forth in claim 1, wherein the first receiving portion (33a) is located on the upper side of the handle pipe (21).

3. The handle structure described in claim 1, wherein the fastening member (51) passes through the pipe through-hole (21h) from the case through-hole (33h) side while being inclined with respect to the vertical direction of the handle pipe (21), and is fastened to the fastening portion (33b2).

4. A handle structure according to claim 1, wherein the first receiving portion (33a) is located on the front side of the handle pipe (21).

5. A handle structure as claimed in any one of claims 1 to 4, wherein the portion (33M) of the first receiving portion (33a) that abuts against the fastening member (51) has a flat portion that is inclined relative to the vertical direction.

6. A handle structure according to any one of claims 1 to 4, wherein the handle pipe (21) has a circular cross section, and the surface of the first receiving portion (33a) that contacts the handle pipe (21) has an arc shape.

7. A handle structure as claimed in any one of claims 1 to 4, wherein the fastening member (51) has a stepped screw structure, and the unthreaded portion (51b) contacts the inner surface of the case through hole (33h).

8. The handle structure according to claim 7, wherein the case through hole (33h) is provided with a metal collar (45) through which the fastening member (51) passes.

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