JP5650167B2 - Movable bumper - Google Patents

Description

  The present invention relates to a movable bumper that can change a protruding position and a retracted position of a bumper.

The dump vehicle is provided with a bumper for preventing entry of other vehicles.
A conventional bumper is generally a so-called fixed bumper. In addition to the fixed type, there is a removable bumper that can remove a bumper that interferes with work, and a movable bumper that projects the bumper by detecting and predicting the possibility of rear-end collision in advance (see Patent Document 1 below) is there.
Also, in order to prevent interference between the loading platform and the bumper when the loading platform is tilted, a movable bumper (see Patent Document 2 below) is devised that moves the bumper up and down via a link mechanism and a hydraulic cylinder when the loading platform is tilted. Has been.

Further, the present applicant has proposed a movable bumper that can manually change the protruding position and the retracted position using a manual fixing tool (see Patent Document 3 below).
If it is the invention which concerns on the said applicant, the movable bumper which reduced the burden of the operator and improved operability can be provided.
In general, the movable bumper has a structure in which a support shaft is bridged between vehicle bodies and a pair of arms is attached to the support shaft.

JP-A-11-291845 Japanese Patent Application No. 6-247241 JP2011-80511

However, in the case of the conventional movable bumper, it is necessary to make a hole through the support shaft in the vehicle base. This drilling operation often requires removal of various members attached to the vehicle base. Furthermore, a long time is required for positioning (centering operation) of the two holes by the drilling tool, resulting in a problem that the cost is increased.
This invention is made | formed in view of the said subject, and the objective of this invention is providing the movable bumper which can solve the said subject.
An example of a specific purpose is as follows.
(A) Provided is a movable bumper that can significantly reduce the installation cost of the movable bumper by significantly reducing the number of mounting steps of the movable bumper compared to the conventional configuration.
(B) A movable bumper capable of improving the reliability of the bumper device while enjoying the advantages that can be provided at low cost and maintaining the rotation state between the protruding position and the retracted position of the movable bumper well over a long period of time. I will provide a.
In addition, the subject of invention other than having described above, its solution means, and its effect are demonstrated in detail in description in the specification mentioned later.

Although the present invention can be expressed in many ways, for example, typical ones are configured as follows. In each of the following inventions, each symbol is shown as an example for easy understanding of the correspondence with the embodiment described later, and each component of the present invention corresponds to the configuration related to the symbol described in the embodiment. It goes without saying that it is not limited.
In the present invention, a pair of vehicle bases 52 provided in the vehicle width direction of the vehicle are provided with support shafts 54, arms 61 are rotatably attached to the support shafts 54, and bumpers 53 are provided between the arms 61. A movable bumper 51 having a horizontal configuration,
An intermediate shaft member 63 provided with a shaft hole 64 through which the support shaft 54 is inserted; and a bearing member 62 that supports the intermediate shaft member 63;
The bearing member 62 is attached to the base end side of the arm 61,
Wherein the intermediate shaft member 63 as smoothly perform the rotational operation even when the arms 61 are inclined in the vehicle width direction have a rounded portion 65 with rounded its axial ends,
The length of the intermediate shaft member 63 in the axial direction is formed larger than that of the bearing member 62, and both end portions of the rounded portion 65 are projected from the bearing member 62 (Claim 1).
With this configuration, when a new movable bumper is attached to the vehicle base, it is not necessary to hang a single support shaft over the vehicle base, so precise work such as centering when drilling holes can be omitted. , Labor and cost can be reduced.
In addition, since the intermediate shaft member has rounded portions rounded at both ends in the axial direction, after the movable arm is attached, each arm may be inclined in the vehicle width center direction or the vehicle width outward direction due to some cause. Since the intermediate shaft member can be inclined with respect to the bearing member and the inclination can be absorbed, the rotation operation of the arm can be smoothly and stably maintained over a long period of time.
In addition, since there is no bearing member at both ends of the intermediate shaft member, the action of the rounding portion absorbing the inclination of the arm can be stably functioned at both ends where movement is most restricted.

In the present invention, when the movable bumper 51 is attached to a vehicle in which a plurality of attachment holes 55 to 60 for attaching bumpers are formed in the vehicle base 52, the one attachment hole 55 of the attachment holes 55 to 60 is used. The support shaft 54 is erected on the vehicle base 52 (claim 2).
If it is this structure, the effort and cost which are required for attachment of an operation bumper can be reduced significantly by utilizing the attachment hole of the bumper already formed. With this configuration, the mounting hole generally has a certain degree of centering accuracy, and the work of opening a new hole is not necessary. The installation man-hour can be remarkably reduced when replacing.

In the present invention, the rounded portion 65 is formed such that the diameters at the both end portions are set to be small in a sectional view, and the diameter gradually increases toward the central region, and the cylindrical portion 66 is formed in the central region. (Claim 3).
With this configuration, when the actually assumed inclination is generated in the arm, both end portions that most restrict the movement of the arm are rounded, so that the arm is smoothly rotated by the support shaft. The processing amount of the rounding part can be reduced.
In addition, since the cylindrical part remains in the central area in the axial direction, even if both ends are rounded, the bearing member can exhibit a sufficient bearing function in the cylindrical part and can be rotated stably. Operation can be realized.

In the present invention, the manual fixing tool 1 is attached to a predetermined position of the arm 61 away from the rotation center of the support shaft 54,
The manual fixture 1 has a piston 4 having a piston shaft 3, a small circular opening 5 through which the piston shaft 3 penetrates at one end side, and the tip portion 4a of the piston 4 at the other end side. A cylinder 2 having a projecting large circular opening 6, an operation lever 10 connected to the piston shaft 3 to perform an operation of rotating the piston 4, and the piston 4 housed in the cylinder 2. Elastic means 9 that urges the tip 4a to protrude, and a protrusion 16 provided on one end side wall 8 of the cylinder 2, and the protrusion 16 has a guide surface 20.
The guide surface 20 is a guide surface for converting the turning operation of the operation lever 10 into the forward / backward movement of the piston 4, and 3 so that the operation lever 10 does not come into contact with the guide surface 20. It is formed on a dimensionally twisted surface,
By operating the operating lever 10 to project the tip portion 4a of the piston 4 from the arm 61 toward the vehicle base 52 side, the projecting position and the retracted position of the arm 61 are set. It is characterized (claim 4 ).

  With this configuration, when the arm fixing operation is performed manually, the operability can be improved at a low cost.

The present invention has a first fixed substrate 70 and a second fixed substrate 71 fixed to the vehicle base 52,
The first fixed substrate 70 has a protruding position fixing portion 72 that fixes the tip portion 4a of the piston 4 of the manual fixing tool 1 corresponding to the protruding position of the bumper 53,
The second fixed substrate 71 has a retracted position fixing portion 80 for fixing the tip end portion 4a of the piston 4 of the manual fixing tool 1 corresponding to the retracted position of the bumper 53,
The second fixed substrate 71 includes an upper shaft hole 78 so that the second fixed substrate 71 can rotate about the support shaft 54.
Fixing the first fixed substrate 70 to the vehicle base 52;
When the second fixed substrate 71 is fixed to the vehicle base 52, the second fixed substrate 71 is rotated around the support shaft 54 to set the position of the retracted position fixing portion 80, and then a bolt or the like. The second fixing substrate 71 is fixed to the vehicle base 52 by the fixing means described above (Claim 5 ).
With this configuration, it is possible to easily set the protruding position and the retracted position of the movable bumper relative to the vehicle substrate according to various situations by interposing the fixed substrate between the vehicle base and the arm.
In addition, when a connecting member (spacer) is provided between the arm and the bumper, the fixed substrate can be set at a preferable protruding position and retracted position corresponding to a plurality of types of bumpers.

In the present invention, the first fixed substrate 70 is provided with a first guide portion 77 and the second fixed substrate 71 is provided with a second guide portion 82, and the first and second guide portions 77 and 82 are protruded from the first fixed substrate 70. In the rotation range from the position to the retracted position, the front end portion 4a of the piston 4 of the manual fixture 1 is guided so as not to protrude toward the vehicle base 52 (Claim 6 ).
With this configuration, when the operator rotates the arm within the rotation range, it is not necessary to operate while pulling the operation lever toward the front side so that the tip portion of the piston does not protrude. Can be improved.
In the present invention, the first fixed substrate 70 and the second fixed substrate 71 can be attached to the vehicle base 52 using at least three attachment holes 55, 58, and 59 of the attachment holes 55 to 60. .
With this configuration, it is possible to reduce the labor and cost of mounting by mounting two types of fixed substrates using mounting holes formed in advance.

  As described above, according to the present invention, the projecting position and the retracted position of the movable bumper can be reduced while significantly reducing the installation cost of the conventional movable bumper to reduce the adoption cost, and enjoying the advantages that can be provided at a low cost. It was possible to provide a movable bumper capable of improving the reliability of the bumper device by maintaining the rotation state of the bumper device well over a long period of time.

It is the front view which looked at the principal part of this movable bumper concerning this embodiment from the vehicles back side. It is the side view which looked at the movable bumper concerning this embodiment from the vehicle width direction. (A) is a side view of the arm which concerns on this embodiment, (b) is a front view of the arm which concerns on this embodiment. It is an enlarged vertical sectional view of an intermediate shaft member, and is a figure for explaining the function of an intermediate shaft member. (A)-(d) is a figure for demonstrating the inclination of the vehicle width direction of each arm. It is a longitudinal cross-sectional view of a manual fixing tool. It is a perspective view of a manual fixing tool when a piston exists in a fixed position. It is a perspective view of a manual fixing tool when a piston exists in a release position. It is a perspective view of a manual fixing tool when a piston exists in a release holding position. (A) is a front view which shows a mode that the 1st, 2nd fixed board | substrate was attached to the vehicle base body, (b) is a side view of a 1st fixed board | substrate. (A) is a front view of a 2nd fixed board | substrate, (b) is a front view of a 1st fixed board | substrate. It is a figure for demonstrating the attachment hole provided in the vehicle base | substrate.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIGS. 1-12 is a figure for demonstrating the movable bumper which shows embodiment of this invention.
As shown in FIGS. 1 and 2, the movable bumper 51 according to the present embodiment is a bumper device in which a bumper 53 is rotatably supported on a vehicle base 52 provided at the rear of the vehicle. The movable bumper 51 has a pair of support shafts 54, 54 erected on the vehicle bases 52, 52 provided one by one in the vehicle width direction H (left-right direction).
As shown in FIG. 12, the support shaft 54 is attached to the vehicle base 52 by attaching the support shaft 54 to the most preferable mounting holes 56 to 60 (currently six holes) defined by law. Used as a hole. In this embodiment, the case where the attachment hole 55 is used as the attachment hole of the support shaft 54 is shown. In FIG. 12, reference numeral 87 denotes a base plate attached to the vehicle base 52.
As shown in FIGS. 3 and 4, a bearing member 62 (see FIG. 4) is provided on the proximal end side of the arm 61, and an intermediate shaft member 63 is fitted into the bearing member 62. The intermediate shaft member 63 has a shaft hole 64 (see FIG. 4) through which the support shaft 54 is inserted.

As shown in an enlarged view in FIG. 4, the outer peripheral surface of the intermediate shaft member 63 according to the present embodiment has rounded portions 65 obtained by rounding both axial end portions. The rounding portion 65 may be formed by cutting both ends with a lathe or the like, or may be formed by other processing methods. In FIG. 4, the size of the rounding portion 65 is exaggerated for easy understanding.
A cylindrical portion 66 having a constant diameter is formed in the central region of the intermediate shaft member 63 in the axial direction. The diameter of the both ends where the rounded portion 65 is formed is the smallest, and the diameter is smoothly increased toward the cylindrical portion 66 in the central region.
The difference between the inner diameter D1 of the bearing member 62 and the diameter D2 of both ends of the intermediate shaft member 63 (X = D1−D2) is set so that the inclination angle −θ to θ assumed by the arm 61 can be absorbed. It is.
As shown in FIG. 5, the inclination angle -θ, θ of the arm 61 is inclined so as to close inward as shown in FIG. 5A with respect to the vehicle longitudinal direction K, or as shown in FIG. As shown, the arms 61 may be inclined to open outward, or the arms 61 may be inclined to the left or right (vehicle width direction H) as shown in FIGS.

The inner rounded portion 65 of the vehicle base 52 and the outer rounded portion 65 of the vehicle base 52 are basically set in the same manner so as to cope with various inclinations shown in FIG. Further, the lengths L1 and L3 of the two rounding portions 65 are set to be the same.
4 indicates the length of the cylindrical portion 66 without the rounding portion 65. The length L2 is appropriately set so that the intermediate shaft member 63 is not twisted in the bearing member 62 even in the case of the assumed maximum inclination angle θ.
Note that the configuration of the peripheral surface of the intermediate shaft member 63 described with reference to FIG. 4 is merely an example, as long as it has a rounding portion 65 that allows the arm 61 to rotate smoothly. The shape and configuration of the intermediate shaft member 63 are not particularly limited.

[Manual fixture configuration]
Each fixing configuration of the protruding position and the retracted position of the movable bumper 51 by the manual fixing tool 1 will be described.
As shown in FIGS. 2 and 3, the movable bumper 51 has the manual fixture 1 fixed on an arm 61 that is a predetermined distance away from a support shaft 54 that is a rotation center.
The manual fixing tool 1 attached to the arm 61 has a cylinder 2 as shown in FIGS. A piston 4 having a piston shaft 3 is inserted into the cylinder 2. A small circular opening 5 is opened on one end side (vehicle outer side) of the cylinder 2, and a large circular opening 6 (see FIG. 6) is opened on the other end (vehicle inner side). The large circular opening 6 is disposed on the arm 61 toward the vehicle base 52 side.
The piston shaft 3 protrudes from the cylinder 2 through the small circular opening 5. A coil spring 9 as an elastic member 9 is interposed between a circular step 7 (see FIG. 6) which is a connection surface between the piston shaft 3 and the piston 4 and one end side wall 8 of the cylinder 2. When the operator's force is not applied by the operation lever 10, the coil spring 9 functions to project the tip portion 4 a of the piston 4 from the large circular opening 6 by a predetermined distance by the elastic force of the coil spring 9.

In the present embodiment, the operation lever 10 includes a grip portion 11 and a lever shaft 12 that are gripped by a hand.
A fixed portion 13 is provided at the tip portion 4 a of the piston shaft 3 and the tip portion 4 a of the lever shaft 12. The fixing portion 13 of the present embodiment employs a method in which a female screw hole is provided in the tip portion 4a of the piston shaft 3 and a male screw is provided in the tip portion 4a of the lever shaft 12 and fixed by screwing. However, other connection structures other than screwing may be employed.
Further, a peripheral wall 19 as a protrusion 16 is provided around the small circular opening 5 on the surface of the one end side wall 8 on the operation lever 10 side. In the present embodiment, the peripheral wall 19 is constituted by a wall obtained by extending the outer peripheral wall 2 a of the cylinder 2. A pair of guide surfaces 20 and 20 are provided on the peripheral wall 19. These guide surfaces 20 and 20 guide the lever shaft 12 of the operation lever 10 and guide the lever shaft 12 from the bottom position 17 to the maximum height position 18.
The pair of guide surfaces 20 and 20 are formed so that a part of the peripheral wall 19 is notched into a substantially valley shape (substantially V shape). Each guide surface 20 is formed in a three-dimensionally twisted surface so that the lever shaft 12 does not come into contact with the guide surface 20 when the operation lever 10 is rotated.
Reference numeral 30 denotes the axial direction of the piston shaft 3, and the axial direction 30 is provided in the thickness direction of the arm 61.

[Configuration of fixed substrate]
Next, a device for attaching the movable bumper 51 to the vehicle base 52 will be described.
As shown in FIG. 12, as described above, the vehicle body 52 to which the bumper 53 has already been attached has a first attachment hole 55, a second attachment hole 56, and a third attachment hole 57 as an upper row in order from the upper rear side of the vehicle. The fourth mounting hole 58, the fifth mounting hole 59, and the sixth mounting hole 60 are provided in the lower row, and are arranged in a parallelogram shape as a whole.
In the present embodiment, the movable bumper 51 is attached using the first attachment hole 55 to the sixth attachment hole 60. Specifically, the detailed setting of the projecting position and the retracted position of the arm 61 is performed on the first and second fixed substrates 70 and 71 side shown in FIG. 11, so that the arm 61 can be rotated without damaging the vehicle base 52. Set the range.

The fixed substrate includes a first fixed substrate 70 and a second fixed substrate 71.
As shown in FIG. 10B, the first fixed substrate 70 has a shape that becomes wider from the upper part to the lower part, and an elastic means locking shaft 67 such as a spring is erected outward from the upper part. In addition, a piston insertion hole 73 is provided at the lower portion as the protruding position fixing portion 72.
Further, the first fixed substrate 70 includes a hook-shaped hanging piece 74 at the top. A positioning hole 75 for bolting to the fourth mounting hole 58 (see FIG. 12) is provided in the central portion of the first fixed substrate 70, and the piston insertion hole 73 is defined by the positioning hole 75 and the hook piece 74. Position to the set position (see FIG. 10).
In addition, the first fixed substrate 70 includes a storage portion 76 that stores a second fixed substrate 71 (to be described later), an arc-shaped first guide portion 77 positioned below the storage portion 76, and a protrusion-side stopper 85. ing.

On the other hand, as shown in FIG. 10A, the second fixed substrate 71 also has a shape that becomes wider from the upper part to the lower part, with the upper shaft hole 78 through which the support shaft 54 is inserted and the support shaft 54 as the center of rotation. An arc-shaped slit 79, a retracted position fixing end 81 as the retracted position fixing part 80, a second guide part 82, and a retracting side stopper 86 are provided.
The retracted position fixed end 81 is for locking the tip 4 a of the piston 4 with the thickness of the second fixed substrate 71.
When the vehicle base 52 is mounted, the second fixed substrate 71 is rotated around the support shaft 54 to change the position of the arc-shaped slit 79 with respect to the fifth mounting hole 59 (see FIG. 12), thereby setting a desired retraction position. . Then, the second fixed board 71 is fixed to the vehicle board 52 by a fixing means such as a bolt through the fifth mounting hole 59, thereby fixing the position of the retracted position fixing end 81 to a desired position.

[Explanation of action in this embodiment]
The operation of the movable bumper shown in FIGS. 1 to 12 will be described.
First, the movable bumper 51 is configured by attaching arms 61 to the respective support shafts 54 so as to be rotatable, and by attaching a bumper 53 made of a horizontal member between the arms 61. Compared to the configuration in which the support shaft 54 is spanned between the pair of vehicle bases 52, 52, the centering operation of the two holes can be made unnecessary.
Moreover, as shown in FIG. 4, since the rounding part 65 of the same rounding amount and the same length is provided in the both-ends area of the intermediate shaft member 63, various right and left shown in FIG. 5 (a)-(d). Since the inclination of the arm 61 can be absorbed by the left and right intermediate shaft members 63, the inclination of the arm 61 caused by various factors can be dealt with over a long period of time.
Furthermore, as shown in FIG. 4, since both ends of the intermediate shaft member 63 protrude from the bearing member 62 by a distance d, the influence of each of the arms on each inclination is reduced, and smooth arm rotation is achieved. Dynamic operation can be realized.

Next, an operation for fixing the fixed substrate to the vehicle substrate 52 will be described.
As shown in FIG. 10, the hanging piece 74 of the first fixed substrate 70 is hooked on the tip circular portion of the second fixed substrate 71, and the positioning hole of the first fixed substrate 70 is mounted on the bolt erected in the fourth mounting hole 58. By passing 75, the piston insertion hole 73 is positioned at the protruding position.
Further, the support shaft 54 is passed through the upper shaft hole 78 of the second fixed substrate 71, and the inclination of the first fixed substrate 70 within the accommodating portion 76 of the first fixed substrate 70 is set. Specifically, the fixing position of the arc-shaped slit 79 is determined by stopping the bolt or the like standing from the fifth mounting hole 59 with a nut or the like.

When attaching the first and second fixed substrates 70 and 71, the support shaft 54 is accommodated in the bearing member 62 fixed to the arm 61. Thereafter, a spring or the like is hung between the elastic means locking shaft 67 of the first fixed substrate 70 and the mounting protrusion 68 of the arm 61.
With this configuration, even if a connecting member 84 as a length adjusting member is provided between the arm 61 and the bumper 53 as shown in FIG. Thus, by attaching the arm 61 to the vehicle base 52, the movable bumper 51 can be attached by setting the optimum protruding position and retracted position.

[Switching between protruding position and retracted position]
Finally, after the movable bumper 51 is attached, an operation for switching the bumper protruding position and the retracted position by the operator will be described.
First, as shown in FIG. 10, at the protruding position of the bumper 53, the piston tip portion 4 a of the manual fixing tool 1 is inserted into the piston insertion hole 73 of the first fixed substrate 70, and the bumper 53 functions as a bumper. (Indicated by an imaginary line 4a-1 in FIG. 10).
Next, when the bumper is to be retracted, the gripper 11 of the operation lever 10 is held, and when the operation lever 10 is rotated with the lever shaft 12 placed along the guide surface 20, the circumferential surface of the lever shaft 12 is The guide surface 20 is guided so as to slide in a state where almost the entire surface is in contact therewith. The piston 4 is pulled into the cylinder 2 against the pressing force of the coil spring 9 while rotating in the cylinder 2 corresponding to the movement distance of the lever shaft 12 in the axial direction of the cylinder 2. During this operation, the operator does not feel that the operation lever 10 is pulled up, and the lever shaft 12 moves so as to slide on the guide surface 20, so that it is great if the operation lever 10 is rotated along the guide surface 20. Power is not necessary.

Further, when the lever shaft 12 of the operating lever is raised while rotating, the guide surface 20 is processed so as to be a three-dimensional twisted surface drawn by the peripheral surface of the lever shaft 12 to be contacted. Since the peripheral surface of the shaft 12 does not come into contact with each other and slides on almost the entire surface of the peripheral surface to be abutted, there is little resistance, and the piston 4 can be smoothly pulled in.
Here, when the distal end portions 4a on both sides of the movable bumper 51 come out of the piston insertion holes 73, if the arm 61 is rotated to the retracted position side while the distal end portion 4a is retracted, the distal end portion 4a becomes the first portion. The tip portion 4a is guided without protruding by the guide portion 77 and the second guide portion 82 (indicated by imaginary lines 42-2 and 4a-3). Then, at the retracted position fixed end 81 of the second fixed substrate 71, the distal end portion 4a projects to complete the positioning operation by the manual fixing tool 1 to the retracted position (indicated by an imaginary line 4a-4).
If it is this structure, since the front-end | tip part 4a does not protrude by the 1st guide part 77 and the 2nd guide part 82, rotation operation of the arm 61 can be performed stably.
Further, during the rotation operation of the arm 61, the arm 61 is pulled by the elastic means locking shaft 67 by the spring 83, so that the rotation operation becomes stable and smooth.

The present invention can be variously modified within the scope of the present invention other than the above embodiment.
(1) Although the movable bumper according to the present invention is generally provided at the rear of the vehicle, it is not excluded that the movable bumper is provided at another part of the vehicle.
(2) If necessary, a known manual fixing tool other than the manual fixing tools shown in FIGS. 6 to 9 may be employed.
(3) The number and position of the mounting holes provided in the vehicle substrate 52 in advance vary depending on laws and the like, and the present invention is not limited to the number and arrangement of the mounting holes shown in FIG. .

DESCRIPTION OF SYMBOLS 1 ... Manual fixing tool 2 ... Cylinder 3 ... Piston shaft 4 ... Piston 4a ... Piston tip 5 ... Small circular opening 6 ... Large circular opening 8 ... One end side wall 9 ... Manual fixing tool elastic means 10 ... Control lever 16 ... Projection 20 ... Guide surface 51 ... Moving bumper 52 ... Vehicle base 53 ... Bumper 54 ... Support shaft 55-60 ... Mounting hole 61 ... Arm 62 ... Bearing member 63 ... Intermediate shaft member 64 ... Shaft hole 65 ... Round part 66 ... Cylindrical portion 70 ... first fixed substrate 71 ... second fixed substrate 72 ... projecting position fixing portion 77 ... first guide portion 78 ... upper shaft hole 80 ... retracting position fixing portion 82 ... second guide portion

Claims (6)

Support shafts (54) are erected on a pair of vehicle base bodies (52) provided in the vehicle width direction of the vehicle, and arms (61) are rotatably attached to the respective support shafts (54). ) A movable bumper with a bumper (53) placed horizontally between
An intermediate shaft member (63) having a shaft hole (64) through which the support shaft (54) is inserted; and a bearing member (62) bearing the intermediate shaft member (63);
The bearing member (62) is attached to the base end side of the arm (61),
The have a respective arm (61) said intermediate shaft member to allow smooth the rotational operation even when inclined in the vehicle width direction (63) is part rounded with rounded its axial ends (65),
The intermediate shaft member (63) has a length in the axial direction larger than that of the bearing member (62), and both end portions of the rounded portion (65) are projected from the bearing member (62). A movable bumper.   The movable bumper according to claim 1, wherein when the movable bumper (51) is attached to a vehicle in which a plurality of mounting holes (55-60) for mounting the bumper are formed in the vehicle base (52), the mounting hole is provided. A movable bumper in which the support shaft (54) is erected on the vehicle base (52) using one mounting hole (55) of (55-60).   The movable bumper according to any one of claims 1 to 2, wherein the rounded portion (65) is set to have a smaller diameter on both ends in a cross-sectional view, and the diameter gradually increases toward the central region. A movable bumper formed to be large and configured to leave a cylindrical portion (66) in the central region. The movable bumper according to any one of claims 1 to 3, wherein a manual fixture (1) is attached to a predetermined position of the arm (61) away from the center of rotation of the support shaft (54).
The manual fixing device (1) includes a piston (4) having a piston shaft (3), a small circular opening (5) through which the piston shaft (3) penetrates at one end side, and the other end side. The cylinder (2) having a large circular opening (6) from which the tip (4a) of the piston (4) protrudes, and the piston shaft for rotating the piston (4). An operating lever (10) connected to (3), and an elastic means (9) accommodated in the cylinder (2) and urged so as to project the tip (4a) of the piston (4); A protrusion (16) provided on one end side wall (8) of the cylinder (2), and the protrusion (16) has a guide surface (20);
The guide surface (20) is a guide surface for converting the turning operation of the operation lever (10) into an advance / retreat operation of the piston (4), and the guide surface (20) is used as the operation lever ( 10) is formed on a three-dimensionally twisted surface so that it does not come into contact with one piece,
By operating the operating lever (10) to project the tip (4a) of the piston (4) from the arm (61) toward the vehicle base (52), the projecting position of the arm (61) And a movable bumper configured to set the retreat position. The movable bumper according to claim 4, comprising a first fixed substrate (70) and a second fixed substrate (71) fixed to the vehicle base (52).
The first fixed substrate (70) includes a protruding position fixing portion (72) for fixing the tip end portion (4a) of the piston of the manual fixing tool (1) corresponding to the protruding position of the bumper (53). Have
The second fixed substrate (71) is a retracted position fixing part for fixing the tip (4a) of the piston (4) of the manual fixing tool (1) corresponding to the retracted position of the bumper (53). (80)
The second fixed substrate (71) includes an upper shaft hole (78) so as to be rotatable around the support shaft (54).
Fixing the first fixed substrate (70) to the vehicle base (52);
When fixing the vehicle base body (52) to the second fixed substrate (71), the second fixed substrate (71) is rotated around the support shaft (54), so that the retracted position fixing portion (80 ), And the second fixed substrate (71) is fixed to the vehicle base (52) by fixing means such as bolts.   The movable bumper according to claim 5, wherein a first guide portion (77) is provided on the first fixed substrate (70) and a second guide portion (82) is provided on the second fixed substrate (71). The first and second guide portions (77, 82) are configured so that the tip end portion (4a) of the piston (4) of the manual fixing device (1) is in the vehicle in the rotation range from the protruding position to the retracted position. A movable bumper that guides the base 52 so as not to protrude.

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