Mirror attachment device

Abstract

To provide a mirror attachment device which can stably support a mirror on a curved rod part in a hand rail.SOLUTION: A mirror attachment device 11A is used to attach a mirror 12 to a hand rail 10 having a curved rod part 10a and includes: a spacer 15 formed by combining spacer pieces 16 each having an engagement recessed part 16a configured to engage with the rod part 10a; and an arm 20 configured to support the mirror 12. The arm 20 has a sandwiching part 23 which sandwiches the rod part 10a through the spacer 15.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a mirror mounting device for mounting a mirror to a handrail having a curved bar. [Background technology]

[0002] In a working machine such as a hydraulic excavator, a cab is generally installed on the front left side of the upper rotating body. A door is attached to the left side of the cab to open and close the entrance through which the operator gets on and off. A handrail is attached near the cab door along the front pillar so that it can be used as a handrail when the operator gets on and off through the entrance. Furthermore, a mirror for ensuring rear and lateral visibility is disposed on the left side of the cab via a mirror mounting device so as to protrude to the left side of the cab.

[0003] As an example of this type of mirror mounting device, Patent Document 1 discloses a mirror mounting device that includes a support arm formed in a loop shape to which a mirror is attached in the middle, and a clamp that is rotatably fitted into a straight rod-shaped portion of the handrail and has an adjustable clamping force, with at least one end of the support arm that can rotate relative to the handrail connected to the clamp.

[0004] According to the mirror mounting device disclosed in Patent Document 1, by adjusting the clamping force of the clamp against the rod-shaped portion of the handrail, it is possible to prevent the support arm from rotating relative to the handrail due to vibrations, impacts, etc. during work, while still allowing the operator to grasp the support arm and perform the rotation operation. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2010-95185 A Summary of the Invention [Problem to be solved by the invention]

[0006] In recent years, the cabs mounted on work machines have mainly been designed with a rounded overall shape. For this reason, the front pillars are formed with a curved shape that bulges forward, and to match this, the handrails are also formed with a curved shape in which the rod-shaped parts between the mounting parts at both ends bulge forward.

[0007] In the mirror mounting device disclosed in Patent Document 1, the clamping surface portion of the clamp that clamps the handrail is formed in a shape suitable for clamping a straight rod-shaped portion of the handrail.

[0008] When the mirror mounting device disclosed in Patent Document 1 is applied as a mirror mounting device for mounting a mirror to a handrail having a curved rod-shaped portion, the curved rod-shaped portion is clamped by a clamping surface portion suitable for clamping a straight rod-shaped portion. This causes a problem that the frictional engagement between the rod-shaped portion and the clamp is insufficient, and the mirror cannot be stably supported on the handrail in a work machine such as a hydraulic excavator that is often subjected to strong vibrations.

[0009] The present invention has been made in consideration of the above problems, and has an object to provide a mirror mounting device that can stably support a mirror on a curved rod-shaped portion of a handrail. [Means for solving the problem]

[0010] The characteristic configuration of the mirror mounting device according to the present invention to solve the above problem is as follows: 1. A mirror mounting device for mounting a mirror to a handrail having a curved bar portion, comprising: a spacer including a plurality of spacer pieces each having an engagement recess that engages with the rod-shaped portion; an arm supporting the mirror; Equipped with The arm has a clamping portion that clamps the rod-shaped portion via the spacer.

[0011] According to the mirror mounting device of this configuration, the arm supporting the mirror has a clamping portion that clamps the curved rod-shaped portion of the handrail via a spacer. The spacer is a combination of a plurality of spacer pieces each having an engagement recess that engages with the curved rod-shaped portion, and the surface portion of the engagement recess in the spacer piece functions as a clamping surface portion suitable for clamping the curved rod-shaped portion. As a result, the clamping force from the clamping portion causes the spacer to frictionally engage along the shape of the curved rod-shaped portion of the handrail. Therefore, the mirror can be stably supported on the curved rod-shaped portion of the handrail, which is particularly effective in working machines such as hydraulic excavators that are often subjected to strong vibrations.

[0012] In the mirror mounting device according to the present invention, The clamping portion preferably includes a bush that is in sliding contact with the spacer.

[0013] With the mirror mounting device of this configuration, by applying a rotational force of a certain level or more to the arm, the arm can be rotated smoothly at the sliding contact point between the spacer and the bush, making it easy to extend the mirror to a position suitable for use or to store it so that it does not get in the way when moving.

[0014] In the mirror mounting device according to the present invention, The bush is preferably disposed around the spacer so as to be relatively displaceable.

[0015] With the mirror mounting device of this configuration, when the rod-shaped portion of the handrail is clamped via the spacer, the relative position between the spacer and the mirror can be corrected by adjusting the relative position with the spacer using the bush that can be displaced relatively around the spacer, so that the rod-shaped portion can be securely clamped via the spacer.

[0016] In the mirror mounting device according to the present invention, It is preferable that the clamping portion includes a restricting piece that restricts movement of the arm relative to the spacer in the longitudinal direction of the rod-shaped portion.

[0017] With the mirror mounting device of this configuration, it is possible to reliably prevent the arm from shifting out of position relative to the spacer in the longitudinal direction of the rod-shaped portion of the handrail when the arm is subjected to vibrations, impacts, etc., or when the operator rotates the arm by gripping it.

[0018] In the mirror mounting device according to the present invention, It is preferable that the boundary portion between the spacer and the clamping portion is constituted by a spherical convex surface provided on the spacer side, and a concave surface provided on the clamping portion side, which engages with the convex surface.

[0019] With the mirror mounting device of this configuration, the arm can be tilted around the boundary between the spacer and the clamping portion as a fulcrum, making it easy to fine-tune the field of view of the mirror supported by the arm.

[0020] In the mirror mounting device according to the present invention, It is preferable that the spacer further comprises a locking member for locking the spacer to the rod-shaped portion.

[0021] According to the mirror mounting device of this configuration, the locking member can reliably prevent the spacer from shifting from the rod-shaped portion of the handrail. As a result, the clamping force of the clamping portion against the rod-shaped portion of the handrail can be used solely to prevent the arm from rotating against the rod-shaped portion due to vibrations, impacts, etc. during work such as excavation, so the clamping force can be easily set.

[0022] In the mirror mounting device according to the present invention, the clamping portion is configured to clamp the rod-shaped portion via the spacer by fastening a receiving member and a pressing tool, the receiving member and pressing tool being disposed to sandwich the spacer, with a fastener; It is preferable that a cover member is provided to cover the presser and the fastener.

[0023] According to the mirror mounting device of this configuration, the pressing tool and the fastening tool are covered by the cover member and cannot be seen from the outside, thereby improving the design. [Brief description of the drawings]

[0024] [Figure 1] FIG. 1 is a side view of a hydraulic excavator equipped with a mirror mounting device. [Diagram 2] FIG. 2 is a structural explanatory diagram of the mirror mounting device of the first embodiment. [Diagram 3] FIG. 3 is a structural explanatory diagram of the mirror mounting device of the second embodiment. [Figure 4] FIG. 4 is a structural explanatory diagram of a mirror mounting device according to the third embodiment. [Diagram 5] FIG. 5 is an explanatory diagram of the essential structure when a frustum-shaped spacer is used. [Figure 6] FIG. 6 is an explanatory diagram of the locking structure of the spacer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] The present invention will be described below with reference to the drawings. In the following embodiment, a mirror mounting device suitable for mounting a mirror (side mirror, rearview mirror) for viewing rearward and lateral directions to a cab of a hydraulic excavator, which is a type of work machine, will be described as an example. However, the present invention is not intended to be limited to the embodiment described below or the configuration shown in the drawings.

[0026] First Embodiment <Overview of hydraulic excavator> Fig. 1 is a side view of a hydraulic excavator 1 equipped with a mirror mounting device 11A. The hydraulic excavator 1 shown in Fig. 1 is equipped with a lower traveling body 2, an upper rotating body 3 rotatably installed on the lower traveling body 2, and a work machine 4 attached to the front center of the upper rotating body 3 so as to be able to bend and rise and fall freely. A cab 5 constituting a driver's compartment is installed on the front left side of the upper rotating body 3.

[0027] A door 6 for opening and closing the entrance through which the operator gets on and off is attached to the left side of the cab 5. In addition, a handrail 10 is attached near the door 6 of the cab 5 along the front pillar 7 so that the operator can use it as a handrail when getting on and off through the entrance.

[0028] The front part of the cab 5 is formed in a rounded shape that bulges forward. Therefore, the front pillar 7 is formed in a curved shape that bulges forward, and to match this, the handrail 10 is also formed in a curved shape such that the rod-shaped part 10a, which has an annular or circular cross section (annular cross section in this example) between the mounting parts at both ends in the vertical direction, bulges forward. A mirror 12 is attached to the curved rod-shaped part 10a of the handrail 10 via a mirror mounting device 11A.

[0029] <Mirror> The mirror 12 is for ensuring rearward and lateral visibility, and is disposed via a mirror mounting device 11A so as to be extendable to the left side of the cab 5 and retractable to the side adjacent to the cab 5. The mirror 12 includes a mirror housing 12a with one side (the front side in the extended position when in use) closed and the other side (the rear side in the extended position when in use) open, and a mirror body 12b fitted to close the other side of the mirror housing 12a. Although detailed explanation using drawings is omitted, a hemispherical seat is formed in the center of one side of the mirror housing 12a, and the mirror 12 is attached to the tip of the arm 20 by engaging approximately half of a spherical support part 22 of an arm 20 described later with this hemispherical seat and fastening a holder that engages with approximately the remaining half to the mirror housing 12a with a fastener. Furthermore, by adjusting the clamping force between the hemispherical seat and the holder on the spherical support part 22 by adjusting the fastening force by adjusting the tightness of the fastener, the mirror 12 can be prevented from rotating (tilting) relative to the spherical support part 22 due to vibrations, impacts, etc. during operation using the hydraulic excavator 1, while the operator can grasp the mirror housing 12a and rotate the mirror 12 relative to the spherical support part 22.

[0030] <Mirror mounting device> Fig. 2 is a structural explanatory diagram of a mirror mounting device 11A of the first embodiment. Fig. 2(a) is a plan view of the mirror mounting device 11A mounted on the rod-shaped portion 10a of the handrail 10, Fig. 2(b) is an enlarged view of part A in Fig. 2(a), and Fig. 2(c) is a cross-sectional view taken along the line BB in Fig. 2(b). As shown in Fig. 2(a), the mirror mounting device 11A includes a resin spacer 15 fitted onto the rod-shaped portion 10a, and a resin arm 20 supporting the mirror 12.

[0031] <Spacer (cylindrical type)> As shown in Figs. 2(b) and (c), the spacer 15 is generally cylindrical in appearance, and in this example, is formed by combining two spacer pieces 16 that are generally semi-cylindrical in appearance. The two spacer pieces 16 are arranged so as to sandwich the rod-shaped portion 10a from both sides in a direction perpendicular to both the longitudinal direction and the bulging direction of the rod-shaped portion 10a (the left-right direction of the upper rotating body 3). Each of the two spacer pieces 16 arranged in this manner has an engagement recess 16a that can engage with the rod-shaped portion 10a, as shown in Fig. 2(c). The engagement recess 16a is formed in a groove shape with a generally semicircular cross section that curves along the curved shape of the rod-shaped portion 10a so as to be in close contact with the outer circumferential surface of the rod-shaped portion 10a.

[0032] 2(b), a minute gap S is provided between the opposing surfaces of the two spacer pieces 16 when they are arranged in close contact with the outer circumferential surface of the rod-shaped portion 10a. By providing such a gap S, it is possible to provide a clamping margin for firmly frictionally engaging the spacer 15 with the outer circumferential surface of the rod-shaped portion 10a by a clamping force from the clamping portion 23, which will be described later.

[0033] In this example, a spacer 15 having an approximately cylindrical appearance is constructed by combining two spacer pieces 16 which are divided into two in the circumferential direction of the spacer 15 (in the circumferential direction of the rod-shaped portion 10a). However, this is not limited to this, and the spacer 15 may also be constructed by combining three or more spacer pieces which are divided into three or more in the circumferential direction of the spacer 15.

[0034] <Arm> As shown in FIG. 2(a), the arm 20 has a bow-shaped arm body 21 that gradually becomes thinner from the base end to the tip end, a spherical support portion 22 that is integrally formed on the tip end side of the arm body 21, and a clamping portion 23 that is formed on the base end side of the arm body 21.

[0035] <Holding part> The clamping portion 23 includes a receiving member 31, a presser 32, and a fastener 33. The receiving member 31 and the presser 32 are disposed in the radial direction of the rod-shaped portion 10a so as to sandwich the spacer 15 fitted onto the rod-shaped portion 10a. The receiving member 31 is integrally connected to the base end side of the arm body 21. The receiving member 31 has a receiving side holder portion 34 that receives and holds approximately half of the spacer 15, and is configured by integrally providing a pair of receiving side mounting portions 35 on both sides of the receiving side holder portion 34. The presser 32 has a pushing side holder portion 36 that receives and holds approximately the remaining half of the spacer 15, and is configured by integrally providing a pair of pushing side mounting portions 37 on both sides of the pushing side holder portion 36. In the receiving member 31 and the presser 32, the spacer 15 is sandwiched between the receiving side holder portion 34 and the pushing side holder portion 36, and the presser 32 is positioned relative to the receiving member 31 so that the pair of receiving side mounting portions 35 and the pair of pushing side mounting portions 37 face each other. The receiving member 31 and the presser 32 thus positioned are fastened together by a fastener 33. As the fastener 33, for example, one consisting of a pair of embedded nuts 38 embedded in the pair of receiving side mounting portions 35 and a pair of pan head screws 39 passing through the pair of pushing side mounting portions 37 and screwed into the pair of embedded nuts 38 can be used.

[0036] <Regulation piece> As shown in Fig. 2(c), the receiving member 31 and the retainer 32 are formed with a restricting piece 60 that restricts the movement of the arm 20 in the longitudinal direction of the rod-shaped portion 10a relative to the spacer 15. In this example, a protrusion that protrudes from both ends in the vertical direction of the receiving member 31 and the retainer 32 and is hooked onto the end face of the spacer 15 (spacer piece 16) is used as the restricting piece 60. By providing such a restricting piece 60, it is possible to reliably prevent the arm 20 from shifting in position relative to the spacer 15 in the longitudinal direction of the rod-shaped portion 10a when vibrations, impacts, etc. are applied to the arm during work such as excavation, or when the arm 20 is rotated by the operator's gripping of the arm 20.

[0037] In the mirror mounting device 11A configured as described above, when attaching a mirror 12 to the curved rod-shaped portion 10a of the handrail 10, two spacer pieces 16 are arranged to sandwich the rod-shaped portion 10a from both sides in a direction perpendicular to both the longitudinal direction and the bulging direction of the rod-shaped portion 10a (the left-right direction of the upper rotating body 3), and a spacer 15 consisting of the two spacer pieces 16 is externally fitted and attached to the rod-shaped portion 10a so that the engaging recesses 16a in each spacer piece 16 are in close contact with the outer peripheral surface of the rod-shaped portion 10a.

[0038] The engaging recesses 16a in the spacer pieces 16 are formed in a groove shape with a substantially semicircular cross section that curves along the curved shape of the rod-shaped portion 10a so as to be in close contact with the outer circumferential surface of the rod-shaped portion 10a. Therefore, when the spacer 15 consisting of the two spacer pieces 16 is attached to the rod-shaped portion 10a so that the engaging recesses 16a in each spacer piece 16 are in close contact with the outer circumferential surface of the rod-shaped portion 10a, the rod-shaped portion 10a and the engaging recesses 16a match and engage with each other in their curved shapes, so that the spacer 15 cannot be rotated in the circumferential direction of the rod-shaped portion 10a even if it is attempted to be rotated. In this way, the spacer 15 is fitted onto the rod-shaped portion 10a so as not to be able to rotate.

[0039] Next, in the radial direction of the rod-shaped portion 10a, the arm body 21 is brought close to the spacer 15 to position the receiving member 31 so that approximately half of the spacer 15 fitted onto the rod-shaped portion 10a is received and held by the receiving side holder portion 34, and the presser 32 is arranged so that approximately the remaining half of the spacer 15 is received and held by the pushing side holder portion 36, and the spacer 15 is sandwiched between the receiving side holder portion 34 and the pushing side holder portion 36, and the presser 32 is positioned relative to the receiving member 31 so that the pair of receiving side mounting portions 35 and the pair of pushing side mounting portions 37 face each other. Then, the receiving member 31 and presser 32 positioned in this way are fastened together using a fastener 33 consisting of a pair of embedded nuts 38 and a pair of pan head screws 39.

[0040] In the mirror mounting device 11A of this embodiment, the spacer 15 is a combination of two spacer pieces 16 each having an engagement recess 16a that engages with the curved rod-shaped portion 10a, and the surface portion of the engagement recess 16a in the spacer piece 16 functions as a clamping surface portion suitable for clamping the curved rod-shaped portion 10a. As a result, the spacer 15 is frictionally engaged along the shape of the rod-shaped portion 10a by the clamping force from the clamping portion 23. Therefore, the mirror 12 can be stably supported by the rod-shaped portion 10a, which is particularly effective in a hydraulic excavator 1 that is often subjected to strong vibrations.

[0041] In addition, in the mirror mounting device 11A, the clamping force of the clamping part 23 can be adjusted by adjusting the fastening force by adjusting the tightening condition of the fastener 33, thereby preventing the arm 20 from rotating relative to the rod-shaped part 10a due to vibrations, shocks, etc. during work such as excavation, while the mirror 12 can be extended to a position suitable for use or stored so as not to get in the way during movement by the operator gripping the arm 20 and rotating it. Note that, in the rotation operation by gripping the arm 20, the spacer 15 is fitted externally to the rod-shaped part 10a so as not to rotate, so that the arm 20 rotates relatively to the spacer 15.

[0042] Furthermore, in the mirror mounting device 11A, the rod-shaped portion 10a can be clamped by the clamping portion 23 at any height position, so that the mirror 12 can be disposed at any height position on the rod-shaped portion 10a.

[0043] Second Embodiment Fig. 3 is a structural explanatory diagram of a mirror mounting device 11B of a second embodiment. Fig. 3(a) is a plan view of the mounting state on the rod-shaped portion 10a of the handrail 10, Fig. 3(b) is an enlarged view of part C in Fig. 3(a), and Fig. 3(c) is a cross-sectional view taken along the line DD in Fig. 3(b). In the second embodiment, the same or similar parts as those in the first embodiment are denoted by the same reference numerals in the drawings, and detailed descriptions thereof are omitted. In the following, the description will be focused on parts unique to the second embodiment.

[0044] <Holding part> As shown in FIG. 3(b), in the mirror mounting device 11B of the second embodiment, the receiving member 31 includes a receiving member main body 41 integrally connected to the base end side of the arm body 21 (see FIG. 3(a)), and a bush 42 that slides against the spacer 15. The receiving member main body 41 has a pair of receiving side mounting parts 35 (see FIG. 3(a)) and a connecting part 43 in which a bush receiving recess 43a capable of receiving the bush 42 in a loosely fitted state is formed, and is configured by integrally connecting the pair of receiving side mounting parts 35 by the connecting part 43. When the resin constituting the arm body 21 is, for example, nylon resin containing glass fiber, the bush 42 is made of a resin having better sliding properties than the nylon resin, for example, POM (polyoxymethylene) resin, and is disposed in the bush receiving recess 43a. The bush 42 and the connecting part 43 constitute a receiving side holder part 34 that receives and holds approximately half of the spacer 15 that is fitted to the rod-shaped part 10a.

[0045] In the mirror mounting device 11B of the second embodiment, the presser 32 includes a presser body 44 and a bush 45 that slides against the spacer 15. The presser body 44 has a pair of push-side mounting parts 37 (see FIG. 3(a)) and a connecting part 46 in which a bush receiving recess 46a capable of receiving the bush 45 in a loosely fitted state is formed, and the pair of push-side mounting parts 37 are integrally connected by the connecting part 46. The bush 45, like the bush 42, is made of a resin that has better sliding properties than the nylon resin, such as a POM (polyoxymethylene) resin, when the resin constituting the presser body 44 is, for example, a nylon resin containing glass fiber, and is disposed in the bush receiving recess 46a. The bush 45 and the connecting part 46 constitute the push-side holder part 36 that receives and holds approximately the remaining half of the spacer 15 that is fitted to the rod-shaped part 10a.

[0046] As shown in FIG. 3(c), the connecting portions 43, 46 are formed with ridges 51, 52 extending in the circumferential direction of the rod-shaped portion 10a. Meanwhile, the bushes 42, 45 are formed with grooves 53, 54 that can engage with the ridges 51, 52. Also, the connecting portions 43, 46 are formed with locking projections 55, 56. Meanwhile, the bushes 42, 45 are formed with locking holes 57, 58 that can engage with the locking projections 55, 56 in a state where there is play in the circumferential direction of the rod-shaped portion 10a. Then, by engaging the ridges 51, 52 with the grooves 53, 54 and by engaging the locking projections 55, 56 with the locking holes 57, 58, the bushes 42, 45 are arranged in the bush receiving recesses 43a, 46a in a loosely fitted state so as to be relatively displaceable around the rod-shaped portion 10a (in the circumferential direction).

[0047] <Regulation piece> The bushes 42, 45 are formed with restricting pieces 60 that restrict the arm 20 from moving in the longitudinal direction of the rod-shaped portion 10a relative to the spacer 15. In this example, the restricting pieces 60 are protruding objects that protrude from both ends of the bushes 42, 45 in the vertical direction and are hooked onto the end faces of the spacer 15 (spacer pieces 16).

[0048] The mirror mounting device 11B of the second embodiment configured as described above can also provide the same effects as those of the mirror mounting device 11A of the first embodiment. Furthermore, according to the mirror mounting device 11B of the second embodiment, by applying a certain or more rotational force to the arm 20, the arm 20 can be smoothly rotated at the sliding contact portion between the spacer 15 and the bushes 42, 45, so that the mirror 12 can be easily extended to a position suitable for use or stored so as not to get in the way during movement. Furthermore, when clamping the rod-shaped portion 10a of the handrail 10 via the spacer 15, the relative position between the spacer 15 and the bushes 42, 45, which are relatively displaceable around the spacer 15, can be adjusted to correct the positional deviation between the spacer 15 and the rod-shaped portion 10a, so that the rod-shaped portion 10a can be securely clamped via the spacer 15.

[0049] Third Embodiment Fig. 4 is a structural explanatory diagram of a mirror mounting device 11C of a third embodiment. Fig. 4(a) is a plan view of the mounting state on the rod-shaped portion 10a of the handrail 10, Fig. 4(b) is an enlarged view of part E in Fig. 4(a), and Fig. 4(c) is a cross-sectional view taken along the line FF in Fig. 4(b). In the third embodiment, the same or similar parts as those in the first embodiment are denoted by the same reference numerals in the drawings, and detailed descriptions thereof are omitted. In the following, the parts unique to the third embodiment will be mainly described.

[0050] <Holding part> In the mirror mounting device 11A of the first embodiment, a resin molded presser 32 is used, but in the mirror mounting device 11C of the third embodiment, a presser 32 formed by bending a metal plate is used. As shown in FIG. 4(a), the presser 32 has a curved plate-like push-side holder portion 36 that receives and holds approximately the remaining half of the spacer 15 held by the receiving-side holder portion 34, and is configured by connecting a pair of flat push-side mounting portions 37 to both sides of the push-side holder portion 36. In the receiving member 31 and the presser 32, the spacer 15 is sandwiched between the receiving-side holder portion 34 and the push-side holder portion 36, and the presser 32 is positioned relative to the receiving member 31 so that the pair of receiving-side mounting portions 35 and the pair of push-side mounting portions 37 face each other. The receiving member 31 and the presser 32 positioned in this manner are fastened by a fastener 33.

[0051] The mirror mounting device 11C of the third embodiment further includes a cover member 61 that covers the presser 32 and the fastener 33 (the pair of pan head screws 39). Although detailed explanation using drawings is omitted, a locking portion (or a locked portion) is provided on the receiving member 31 side, and a locking device (or a locking portion) is provided on the cover member 61 side, and the locking portion (or the locked portion) and the locking device (or the locking portion) are elastically engaged with each other, so that the cover member 61 can be easily attached and detached to the receiving member 31.

[0052] The mirror mounting device 11C of the third embodiment configured as described above can also provide the same effects as the mirror mounting device 11A of the first embodiment. Furthermore, according to the mirror mounting device 11C of the third embodiment, the presser 32 and the fastener 33 (the pair of pan head screws 39) are covered by the cover member 61, so that the presser 32 and the fastener 33 are not visible from the outside, and the design can be improved.

[0053] <Spacer (ball stand type)> FIG. 5 is an explanatory diagram of the main structure when a spherical spacer 65 is used. FIG. 5(a) is a cross-sectional view corresponding to the cross-sectional view of FIG. 2(c), FIG. 5(b) is a cross-sectional view corresponding to the cross-sectional view of FIG. 3(c), and FIG. 5(c) is a cross-sectional view corresponding to the cross-sectional view of FIG. 4(c). In the above-mentioned mirror mounting devices 11A to 11C, an example was shown in which the spacer 15, which is approximately cylindrical in appearance, is used and two spacer pieces 16, which are approximately semi-cylinder in appearance, are combined to form the spacer 15. However, as shown in FIG. 5(a) to (c), the spacer 65 may be configured by using a spacer 65, which is approximately spherical in appearance, and combining two spacer pieces 66, which are approximately semi-spherical in appearance. Here, the two spacer pieces 66 are arranged so as to sandwich the rod-shaped portion 10a from both sides in a direction perpendicular to both the longitudinal direction and the bulging direction of the rod-shaped portion 10a (the left-right direction of the upper rotating body 3). Each of the two spacer pieces 66 arranged in this manner has an engagement recess 66a that can engage with the rod-shaped portion 10a so as to come into close contact with the outer circumferential surface of the rod-shaped portion 10a. The engagement recess 66a is formed in a groove shape with a substantially semicircular cross section that curves along the curved shape of the rod-shaped portion 10a so as to come into close contact with the outer circumferential surface of the rod-shaped portion 10a. Note that in the example shown in Figs. 5(a) to (c), an example is shown in which the spacer 65 having a substantially spherical frustum shape in appearance is configured by combining two spacer pieces 66 that are divided into two in the circumferential direction of the spacer 65 (the circumferential direction of the rod-shaped portion 10a), but this is not limited thereto, and the spacer 65 having a substantially spherical frustum shape in appearance may be configured by combining three or more spacer pieces that are divided into three or more in the circumferential direction of the spacer 65.

[0054] 5(a) to (c), the boundary portion between spacer 65 and clamping unit 23 is composed of a spherical convex surface 65a provided on the spacer 65 side, and a concave surface 23a provided on the clamping unit 23 side and engaging with the convex surface 65a. This allows arm 20 to be tilted with the boundary portion between spacer 65 and clamping unit 23 as a fulcrum, making it easy to fine-tune the field of view of mirror 12.

[0055] <Locking member> FIG. 6 is an explanatory diagram of the locking structure of the spacers 15 and 65. FIG. 6(a) is a plan view partially in section showing a case where a locking pin 71 is used as a locking member of the spacer 15 to the rod-shaped portion 10a. FIG. 6(b) is a plan view partially in section showing a GG arrow of FIG. 6(a). FIG. 6(c) is a plan view partially in section showing a case where a locking pin 71 is used as a locking member of the spacer 65 to the rod-shaped portion 10a. FIG. 6(d) is a plan view partially in section showing a HH arrow of FIG. 6(c). FIG. 6(e) is a plan view partially in section showing a case where a tapping screw 72 is used as a locking member of the spacer 15 to the rod-shaped portion 10a. FIG. 6(f) is a plan view partially in section showing a II arrow of FIG. 6(e). FIG. 6(g) is a plan view partially in section showing a case where a tapping screw 72 is used as a locking member of the spacer 65 to the rod-shaped portion 10a. FIG. 6(h) is a plan view partially in section showing a JJ arrow of FIG. 6(g).

[0056] In the mirror mounting devices 11A to 11C, it is preferable to provide a locking member for locking the spacer 15, 65 to the rod-shaped portion 10a. As the locking member, as shown in Figs. 6(a) to (d), a locking pin 71 that is provided to penetrate the rod-shaped portion 10a in the radial direction and protrudes from both sides of the rod-shaped portion 10a in the radial direction can be used. When using this locking pin 71, the two spacer pieces 16, 66 are provided with engagement holes 16b, 66b that engage with both ends of the locking pin 71 protruding radially outward from the rod-shaped portion 10a. Also, as the locking member, as shown in Figs. 6(e) to (h), a tapping screw 72 that penetrates the spacer 15, 65 from the outer periphery side of the spacer 15, 65 and screws into the outer periphery of the rod-shaped portion 10a can be used. When this tapping screw 72 is used, the two spacer pieces 16, 66 are provided with countersunk holes 16c, 66c capable of receiving the head of the tapping screw 72 so that the head does not protrude from the outer circumferential surfaces of the spacer pieces 16, 66.

[0057] According to the mirror mounting devices 11A to 11C provided with the above-mentioned locking members (locking pin 71, tapping screw 72), it is possible to reliably prevent the spacers 15, 65 from shifting in position relative to the rod-shaped portion 10a of the handrail 10, more specifically, from shifting in position in the longitudinal direction of the rod-shaped portion 10a, by the locking members (locking pin 71, tapping screw 72). As a result, the clamping force of the clamping portion 23 on the rod-shaped portion 10a can be used exclusively as a clamping force that prevents the arm 20 from rotating relative to the rod-shaped portion 10a of the handrail 10 due to vibrations, impacts, etc. during work such as excavation, so that the clamping force can be easily set.

[0058] The above describes the mirror mounting device of the present invention based on several embodiments, but the present invention is not limited to the configurations described in the above embodiments, and the configuration can be changed as appropriate within the scope of the spirit of the invention, such as by appropriately combining the configurations described in each embodiment. [Industrial Applicability]

[0059] The mirror mounting device of the present invention can be used, for example, in applications where a mirror is attached to a curved rod-shaped portion of a handrail in a work machine such as a construction machine or a loading and unloading machine. [Explanation of symbols]

[0060] 10 Handrails 10a Rod-shaped part 11A~11C Mirror mounting device 12. Mirror 15 Spacer 16 Spacer piece 16a Engagement recess 20 Arm 23 Clamping part 23a concave 42,45 Bush 60 Regulatory piece 61 Cover member 65 Spacer 65a Convex 66 Spacer piece 66a Engagement recess 71 Locking pin (locking member) 72 Tapping screw (locking member)

Claims

1. 1. A mirror mounting device for mounting a mirror to a handrail having a curved bar portion, comprising: a spacer including a plurality of spacer pieces each having an engagement recess that engages with the rod-shaped portion; an arm supporting the mirror; Equipped with The arm has a clamping portion that clamps the rod-shaped portion via the spacer.

2. The mirror mounting device according to claim 1 , wherein the clamping portion includes a bush that is in sliding contact with the spacer.

3. 3. The mirror mounting device according to claim 2, wherein the bush is disposed around the spacer so as to be relatively displaceable.

4. 4. The mirror mounting device according to claim 1, wherein the clamping portion includes a restricting piece that restricts movement of the arm relative to the spacer in the longitudinal direction of the rod-shaped portion.

5. A mirror mounting device as described in any one of claims 1 to 3, wherein the boundary portion between the spacer and the clamping portion is composed of a spherical convex surface provided on the spacer side and a concave surface provided on the clamping portion side that engages with the convex surface.

6. The mirror mounting device according to any one of claims 1 to 3, further comprising a locking member for locking the spacer to the rod-shaped portion.

7. the clamping portion is configured to clamp the rod-shaped portion via the spacer by fastening a receiving member and a pressing tool, the receiving member and pressing tool being disposed to sandwich the spacer, with a fastener; The mirror mounting device according to any one of claims 1 to 3, further comprising a cover member for covering the pressing tool and the fastening tool.

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