XYZ three-degree-of-freedom shaking quantity control mechanism for vehicle-mounted display terminal

Abstract

The utility model discloses a vehicle-mounted display terminal XYZ three-degree-of-freedom shake quantity control mechanism, which comprises a display screen and further comprises an X-direction damping mechanism used for controlling the shake quantity of the display screen in a vertical pressing state, a vehicle starting state or a braking state, a Z-direction damping mechanism used for controlling the shake quantity of the display screen in a vertical pressing state and a Z-direction damping mechanism used for controlling the shake quantity of the display screen. The Y-direction gap adjusting mechanism is used for controlling the display screen to shake when the display screen is pressed left and right; the Z-direction gap adjusting mechanism is used for controlling the display screen to shake on a bumpy road section; the X-direction damping mechanism, the Y-direction gap adjusting mechanism and the Z-direction gap adjusting mechanism are used for controlling the X-direction shaking gap, the Y-direction shaking gap and the Z-direction shaking gap of the display screen. The X-direction damping mechanism is arranged to control shaking of the screen in the X direction, and the Y-direction gap adjusting mechanism and the Z-direction gap adjusting mechanism are arranged to control shaking of the screen in the Y direction and the Z direction respectively.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle interior decoration parts, in particular to an XYZ three-degree-of-freedom shaking amount control mechanism for a vehicle-mounted display terminal. Background Art

[0002] As the requirements for entertainment and intelligence in modern cars continue to increase, more and more vehicles are equipped with multiple display screens in the car, and the display screens integrate many entertainment and control functions. In order to enable drivers or passengers to view and operate the screens at a comfortable angle, car manufacturers will make the in-vehicle display screens adjustable. For adjustable in-vehicle display screens, the screen may shake when the vehicle starts, brakes, or drives on bumpy roads; and when people touch the screen, if the screen shakes a lot, it will give people a bad tactile experience. Utility Model Content

[0003] The technical problem to be solved by the present invention is that for an adjustable vehicle-mounted display screen, the screen may shake when the vehicle starts, brakes, or travels on bumpy and undulating roads. Therefore, an XYZ three-degree-of-freedom shaking control mechanism for a vehicle-mounted display terminal is provided to control the shaking of the screen under all working conditions.

[0004] The technical problem to be solved by the utility model can be achieved through the following technical solutions:

[0005] A vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism, comprising:

[0006] A display screen;

[0007] An X-direction damping mechanism for controlling the shaking amount of the display screen when the display screen is vertically pressed, or when the vehicle starts or brakes;

[0008] A Y-direction gap adjustment mechanism for controlling the display screen to shake when the display screen is pressed left or right or turns;

[0009] A Z-direction clearance control mechanism for controlling the display screen from shaking on bumpy roads;

[0010] The display screen relies on the X-direction damping mechanism, the Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism to control the shaking gaps in the X, Y and Z directions.

[0011] In a preferred embodiment of the utility model, it also includes a bracket and a rotating arm, the bracket is mounted on the vehicle body, and the display screen is mounted on the rotating arm; the X-direction damping mechanism, the Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism are all arranged between the bracket and the rotating arm.

[0012] In a preferred embodiment of the utility model, it further comprises a driving mechanism, wherein a fixed side of the driving mechanism is mounted on the bracket, and a driving side of the driving mechanism is slidably connected to the bracket or slides relative to the bracket and is hinged to the rotating arm.

[0013] In a preferred embodiment of the utility model, the driving mechanism includes a driving unit and a sliding nut, the driving unit constitutes the fixed side of the driving mechanism, and the sliding nut constitutes the driving side of the driving mechanism; the driving unit drives the sliding nut to perform linear reciprocating motion.

[0014] In a preferred embodiment of the present utility model, the driving unit includes a driving motor and a screw rod driven to rotate by the driving motor, and the sliding nut is arranged on the screw rod and performs linear motion by the rotation of the screw rod.

[0015] In a preferred embodiment of the utility model, it further comprises a connecting rod, one end of which is hinged to the sliding nut, and the other end of which is hinged to the rotating arm; the X-axis damping mechanism is arranged between the sliding nut and the bracket.

[0016] In a preferred embodiment of the utility model, the driving side of the driving mechanism is slidingly connected with the bracket in the following manner: an elongated hole is provided on the bracket, a first cylindrical boss is provided on the sliding nut, and the first cylindrical boss is slidingly arranged in the elongated hole; and the X-axis damping mechanism unit is arranged between the bracket and the first cylindrical boss.

[0017] In a preferred embodiment of the present utility model, the X-direction damping mechanism unit comprises:

[0018] At least one elastic element, a pair of friction plates and a nut, the elastic element is clamped by the pair of friction plates and is arranged between the first cylindrical boss and the bracket through the nut, the nut is fixed on the first cylindrical boss, and the elastic force of the elastic element can be adjusted by rotating the nut, one friction plate is in contact with the bracket, and the other friction plate is in contact with the nut.

[0019] In a preferred embodiment of the present utility model, the driving side of the driving mechanism slides relative to the bracket specifically: the sliding nut slides relative to the bracket; and the X-direction damping mechanism unit is arranged between the bracket and the sliding nut.

[0020] In a preferred embodiment of the utility model, the X-axis damping mechanism includes a damping element fixed on the bracket and a damping ring, a C-shaped groove is opened on the damping element, and the damping ring is a C-shaped damping ring, which is embedded in the C-shaped groove and semi-surrounds the outer peripheral surface of the sliding nut.

[0021] In a preferred embodiment of the present utility model, a second cylindrical boss is arranged on the sliding nut, and the second cylindrical boss is hinged to one end of the connecting rod.

[0022] In a preferred embodiment of the present invention, the Y-direction gap control mechanism and the Z-direction gap control mechanism are combined to form a YZ-direction gap control combined mechanism; the YZ-direction gap control combined mechanism is divided into two groups, which are symmetrically arranged between the bracket and the rotating arm.

[0023] In a preferred embodiment of the present utility model, each set of YZ-direction gap control combination mechanisms is arranged at the hinge between the bracket and the rotating arm.

[0024] In a preferred embodiment of the utility model, each set of YZ-direction clearance control combination mechanism includes a bushing and a step bolt, the bushing has a first circular hole, and the step bolt has a head, a smooth axis section and a threaded section; corresponding to each set of YZ-direction clearance control combination mechanism, a second circular hole is provided on the rotating arm, and a first threaded hole is provided on the bracket, the bushing is embedded in the second circular hole and fits with the second circular hole with an interference or small clearance, the smooth axis section of the step bolt passes through the first circular hole, the outer circumference of the smooth axis section fits with the inner circumference of the first circular hole with an interference or small clearance, and the threaded section is screwed into the first threaded hole.

[0025] In a preferred embodiment of the utility model, the radial cross-section of the bushing is in the shape of an I, wherein the outer cylindrical surface of the I-shape is embedded in the second circular hole and fits with the second circular hole with an interference fit or a small clearance; the two side edges of the I-shape respectively fit with the two parts of the outer side surfaces of the rotating arm and the head of the step bolt and a surface of the bracket, and the clearance between the two parts of the outer side surfaces of the rotating arm and the head of the step bolt and a surface of the bracket can be adjusted by rotating the step bolt.

[0026] By adopting the above technical solution, the utility model controls the shaking of the screen in the X direction by setting the X-direction damping mechanism, and controls the shaking of the screen in the Y direction and the Z direction respectively by setting the Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 Schematic diagram of the vehicle body coordinate system.

[0028] Figure 2 It is a structural schematic diagram of the XYZ three-degree-of-freedom shake control mechanism of the vehicle-mounted display terminal of the utility model.

[0029] Figure 3 It is an exploded schematic diagram of the XYZ three-degree-of-freedom shake control mechanism of the vehicle-mounted display terminal of the utility model.

[0030] Figure 4 It is a cross-sectional view of the X-direction damping mechanism of the vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism in Example 1 of the utility model.

[0031] Figure 5 It is a cross-sectional view of the YZ clearance adjustment combination mechanism of the XYZ three-degree-of-freedom shake control mechanism of the vehicle-mounted display terminal in Example 1 of the utility model.

[0032] Figure 6 It is a cross-sectional view of the YZ gap adjustment combination mechanism of the XYZ three-degree-of-freedom shake control mechanism of the vehicle-mounted display terminal in Example 2 of the utility model.

[0033] Figure 7 It is a cross-sectional view of the X-direction damping mechanism of the vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism in Example 3 of the utility model.

[0034] Figure 8 It is a schematic diagram of the exploded view of the XYZ three-degree-of-freedom shake control mechanism of the vehicle-mounted display terminal in Example 3 of the utility model. DETAILED DESCRIPTION

[0035] The present invention is further described below in conjunction with the accompanying drawings and specific implementations.

[0036] See also Figure 1 In the vehicle body coordinate system of the present invention, the X direction is parallel to the length direction of the vehicle body, the Y direction is parallel to the width direction of the vehicle body, and the Z direction is perpendicular to the bottom surface.

[0037] See also Figure 2 and Figure 3 , a vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism shown in the figure includes a display screen ( Figure 2 and Figure 3 Not shown), the bracket 100, the driving mechanism, the rotating arm 200, and the connecting rod 300 constitute the pitch adjustment mechanism of the entire display screen. Of course, the XYZ three-degree-of-freedom shake control mechanism of the vehicle-mounted display terminal can also be used for the left and right adjustment mechanism of the display screen.

[0038] The driving mechanism includes a driving unit 400 and a sliding nut 410. The driving unit 400 includes a driving motor 420 and a screw rod 430 driven to rotate by the driving motor 420. Of course, the driving unit 400 can also be a manual mechanism. The screw rod 430 drives the sliding nut 410 to reciprocate linearly during rotation, and drives the display screen to pitch through the rotating arm 200 and the connecting rod 300.

[0039] The driving motor 420 as the fixed side of the driving mechanism is fixed to the bracket 100 by means of fastening bolts 440 , and the bracket 100 is fixed at an appropriate position in the vehicle body.

[0040] The sliding nut 410 serves as the driving side of the driving mechanism, and drives the display screen to perform pitch motion through the rotating arm 200 and the connecting rod 300. One side of the sliding nut 410 is slidably configured on the bracket 100 or slides along the bracket 100, and the other side of the sliding nut 410 is hinged to one end of the connecting rod 300 to form a hinge point a. The other end of the connecting rod 300 is hinged to the rotating arm 200 to form a hinge point b, and the left and right sides of the rotating arm 200 are hinged to the bracket 100 to form coaxial hinge points c and d.

[0041] Regarding the solution in which one side of the sliding nut 410 is slidably configured on the bracket 100: In order to enable the sliding nut 410 to smoothly perform reciprocating linear motion along the bracket 100, an elongated hole 111 is provided on the bracket 100, and a cylindrical boss 411 (the aforementioned first cylindrical boss) is provided on one side of the sliding nut 410. The cylindrical boss 411 is slidably configured in the elongated hole 111 and slides in the elongated hole 111.

[0042] The working principle of the utility model is as follows: the driving motor 420 drives the screw rod 430 to rotate, the screw rod 430 drives the sliding nut 410 to perform linear reciprocating motion along the length direction of the long hole 111, the linear motion of the sliding nut 410 drives the connecting rod 300 to swing around the hinge point a, the swinging connecting rod 300 drives the rotating arm 200 to rotate around the hinge points c and d through the hinge point b, and the rotating arm 200 drives the display screen fixed on the rotating arm 200 to perform pitch adjustment.

[0043] The utility model is characterized in that it is also provided with: an X-direction damping mechanism for controlling the shaking amount of the display screen when vertically pressed, the vehicle starts or brakes, a Y-direction gap adjustment mechanism for controlling the shaking of the display screen when pressed left or right or when turning, and a Z-direction gap adjustment mechanism for controlling the shaking of the display screen on bumpy roads.

[0044] The following further describes the different structures and installation methods of the X-direction damping mechanism, the Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism in each embodiment in conjunction with specific embodiments.

[0045] Example 1

[0046] See also Figure 3 , Figure 4 and Figure 5 The X-axis damping mechanism in this embodiment is arranged between the driving side of the driving mechanism and the bracket 100, that is, between the cylindrical boss 411 of the sliding nut 410 and the bracket 100. Specifically, the X-axis damping mechanism unit includes at least one elastic element 510 and a pair of friction plates 520, 530 and a nut 540. The cylindrical boss 411 of the sliding nut 410 is provided with an external thread, so that the nut 540 can be screwed on the cylindrical boss 411. During installation, the cylindrical boss 411 of the sliding nut 410 passes through the elastic element 510 and a pair of friction plates 520, 530 and is screwed onto the nut 540. The elastic element 510 is clamped by the pair of friction plates 520, 530. The elastic force of the elastic element 510 can be adjusted by rotating the nut 540. One friction plate 520 is in friction contact with the bracket 100, and the other friction plate 530 is in contact with the nut 540. In this way, friction is generated between the friction plate 520, the sliding nut 410 and the bracket 100, forming an X-direction damping force. The X-direction damping force is used to eliminate the sliding and shaking amount of the display screen along the X-direction in the vehicle when vertically pressed, the vehicle starts or brakes.

[0047] The nut 540 and the friction plate 530 can be combined into a flanged nut. It is also possible to have only one friction plate 520. It is not necessary to have two friction plates.

[0048] A cylindrical boss 412 is provided on the sliding nut 410, a circular hole 310 is provided at one end of the connecting rod 300, a bushing 610 is inserted into the circular hole 310, and the cylindrical boss 412 passes through the circular hole 611 of the bushing 610 to form the aforementioned hinge point a.

[0049] A circular hole 320 is provided at the other end of the connecting rod 300, and a bushing 620 is inserted into the circular hole 320. A threaded hole 250 is provided in the rotating arm 200. The step bolt 730 passes through the inner hole of the bushing 620 and is screwed into the threaded hole 250 of the rotating arm 200, so that the other end of the connecting rod 300 is hinged to the rotating arm 200 to form a hinge point b.

[0050] The Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism of this embodiment are combined together to form a YZ-direction gap adjustment combination mechanism; the YZ-direction gap control combination mechanism consists of two groups, which are symmetrically arranged between the bracket 100 and the rotating arm 200, specifically, each group of YZ-direction gap control combination mechanism is arranged at the hinge between the bracket 100 and the rotating arm 200, that is, the hinge points c and d.

[0051] Each set of YZ clearance control combined mechanism includes a bushing 720 and a step bolt 710. The bushing 720 has an I-shaped radial section and a circular hole 721 (the aforementioned first circular hole). The step bolt 710 has a head 711, a smooth shaft section 712 and a threaded section 713.

[0052] Corresponding to each set of YZ-direction clearance control combination mechanisms, a threaded hole 150 is provided on the bracket 100, and a circular hole 220 (the aforementioned second circular hole) is provided on the rotating arm 200. The bushing 720 is embedded in the circular hole 220 and fits with the circular hole 220 with an interference fit or a small clearance, that is, the outer cylindrical surface 722 of the I-shape is embedded in the circular hole 220 and fits with the circular hole 220 with an interference fit or a small clearance. The two side edges 723 and 724 of the I-shape are respectively fitted with the two parts of the outer side surfaces 230 and 240 of the rotating arm 200 and the head 711 of the step bolt 710 and a surface of the bracket 100. By rotating the step bolt 710, the clearance between the two parts of the outer side surfaces 230 and 240 of the rotating arm 200 and the head 711 of the step bolt 710 and a surface of the bracket 100 can be adjusted.

[0053] The optical axis section 712 of the step bolt 710 passes through the circular hole 721, and the outer circumference of the optical axis section 712 is fitted with the inner circumference of the circular hole 721 with interference or small clearance, and the bolt section 713 is screwed into the bolt hole 150 to form the aforementioned hinge points c and d. The rotating arm 200 rotates around the step bolt 710 with no clearance or small clearance, thereby preventing the display screen from shaking in the Y direction when pressing left or right or turning, and shaking in the Z direction on bumpy roads.

[0054] Example 2

[0055] See also Figure 6 The difference between this embodiment and the first embodiment is that: corresponding to each set of YZ-direction clearance control combination mechanisms, a circular hole 120 is provided on the bracket 100, and a threaded hole 210 is provided on the rotating arm 200. The bushing 720 is embedded in the circular hole 120 and fits with the circular hole 120 with an interference fit or a small clearance, that is, the outer cylindrical surface 722 of the I-shape is embedded in the circular hole 120 and fits with the circular hole 120 with an interference fit or a small clearance. The two side edges 723 and 724 of the I-shape are respectively fitted with the two outer side surfaces 130 and 140 of the bracket 100, the head 711 of the step bolt 710, and a surface of the rotating arm 200. By rotating the step bolt 710, the clearance between the two outer side surfaces 130 and 140 of the bracket 100 and the head 711 of the step bolt 710 and a surface of the rotating arm 200 can be adjusted.

[0056] The optical axis section 712 of the step bolt 710 passes through the circular hole 721, and the outer circumference of the optical axis section 712 is fitted with the inner circumference of the circular hole 721 with interference or small clearance, and the bolt section 713 is screwed into the bolt hole 210 to form the aforementioned hinge points c and d. The rotating arm 200 rotates around the step bolt 710 with no clearance or small clearance, thereby preventing the Y-direction shaking of the display screen when it is pressed left or right or when turning, and the Z-direction shaking when it shakes on bumpy roads.

[0057] The rest of this embodiment is the same as that of Embodiment 1.

[0058] Example 3

[0059] See also Figure 7 and Figure 8 The X-direction damping mechanism unit in this embodiment is arranged between the sliding nut 410 and the bracket 100. Specifically, the X-direction damping mechanism in this embodiment includes a damping element 920 and a damping ring 930 fixed to the bracket 100 by a fastening bolt 910. A C-shaped groove 921 is provided on the damping element 920. The damping ring 930 is a C-shaped damping ring. The C-shaped damping ring is embedded in the C-shaped groove 921 and semi-surrounds the cylindrical shaft 413 on the sliding nut 410. After the cylindrical shaft 413 and the damping ring 930 are assembled, the damping ring 930 is compressed and provides a certain radial pressure on the cylindrical shaft 413. When the sliding nut 410 moves along the X-direction, that is, slides along the bracket 100, the damping element 920 can provide a certain axial damping force, and this damping force is used to resist the shaking of the display screen along the X-direction in the vehicle.

[0060] The configuration and structure of the YZ-direction gap adjustment combination mechanism of this embodiment are the same as those of the first embodiment.

Claims

1. A vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism, characterized in that: include: A display screen; An X-direction damping mechanism for controlling the shaking amount of the display screen when the display screen is vertically pressed, or when the vehicle starts or brakes; A Y-direction gap control mechanism for controlling the display screen to shake when the display screen is pressed left or right or turns; A Z-direction clearance control mechanism for controlling the display screen from shaking on bumpy roads; The display screen relies on the X-direction damping mechanism, the Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism to control the shaking gaps in the X, Y and Z directions; The Y-direction gap control mechanism and the Z-direction gap control mechanism are combined to form a YZ-direction gap control combined mechanism.

2. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 1, characterized in that: It also includes a bracket and a rotating arm, wherein the bracket is mounted on the vehicle body and the display screen is mounted on the rotating arm; the X-direction damping mechanism, the Y-direction gap adjustment mechanism and the Z-direction gap adjustment mechanism are all arranged between the bracket and the rotating arm.

3. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 2, characterized in that: It also includes a driving mechanism, wherein a fixed side of the driving mechanism is mounted on the bracket, and a driving side of the driving mechanism is slidably connected to the bracket or slides relative to the bracket and is hinged to the rotating arm.

4. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 3, characterized in that: The driving mechanism comprises a driving unit and a sliding nut, wherein the driving unit constitutes a fixed side of the driving mechanism and the sliding nut constitutes a driving side of the driving mechanism; the driving unit drives the sliding nut to perform linear reciprocating motion.

5. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 4, characterized in that: The driving unit comprises a driving motor and a screw rod driven to rotate by the driving motor. The sliding nut is arranged on the screw rod and performs linear motion by the rotation of the screw rod.

6. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 4, characterized in that: It also includes a connecting rod, one end of which is hinged to the sliding nut, and the other end of which is hinged to the rotating arm; the X-axis damping mechanism is arranged between the sliding nut and the bracket.

7. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 6, characterized in that: The driving side of the driving mechanism is slidably connected to the bracket in the following manner: an elongated hole is provided on the bracket, a first cylindrical boss is provided on the sliding nut, and the first cylindrical boss is slidably arranged in the elongated hole; the X-direction damping mechanism unit is arranged between the bracket and the first cylindrical boss.

8. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 7, characterized in that: The X-direction damping mechanism unit comprises: At least one elastic element, a pair of friction plates and a nut, the elastic element is clamped by the pair of friction plates and is arranged between the first cylindrical boss and the bracket through the nut, the nut is fixed on the first cylindrical boss, and the elastic force of the elastic element can be adjusted by rotating the nut, one friction plate is in contact with the bracket, and the other friction plate is in contact with the nut.

9. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 6, characterized in that: The driving side of the driving mechanism slides relative to the bracket specifically: the sliding nut slides relative to the bracket; and the X-direction damping mechanism unit is arranged between the bracket and the sliding nut.

10. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 9, characterized in that: The X-axis damping mechanism includes a damping element fixed on the bracket and a damping ring. A C-shaped groove is provided on the damping element. The damping ring is a C-shaped damping ring which is embedded in the C-shaped groove and semi-surrounds the outer peripheral surface of the sliding nut.

11. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 6, characterized in that: A second cylindrical boss is arranged on the sliding nut, and the second cylindrical boss is hinged to one end of the connecting rod.

12. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 6, characterized in that: The YZ-direction gap control combined mechanism consists of two groups, which are symmetrically arranged between the bracket and the rotating arm.

13. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 12, characterized in that: Each set of YZ clearance control combined mechanisms is arranged at the hinge between the bracket and the rotating arm.

14. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 13, characterized in that: Each set of YZ-direction clearance control combination mechanism includes a bushing and a step bolt, the bushing has a first circular hole, and the step bolt has a head, a smooth axis section and a threaded section; corresponding to each set of YZ-direction clearance control combination mechanism, a second circular hole is arranged on the rotating arm, a first threaded hole is arranged on the bracket, the bushing is embedded in the second circular hole and fits with the second circular hole with an interference or small clearance, the smooth axis section of the step bolt passes through the first circular hole, the outer circumference of the smooth axis section fits with the inner circumference of the first circular hole with an interference or small clearance, and the threaded section is screwed into the first threaded hole.

15. The vehicle-mounted display terminal XYZ three-degree-of-freedom shake control mechanism according to claim 14, characterized in that: The radial cross-section of the bushing is in the shape of an I, wherein the outer cylindrical surface of the I is embedded in the second circular hole and fits with the second circular hole with interference or a small clearance; the two sides of the I are respectively fitted with the two parts of the outer side surfaces of the rotating arm and the head of the step bolt and a surface of the bracket. By turning the step bolt, the clearance between the two parts of the outer side surfaces of the rotating arm and the head of the step bolt and a surface of the bracket can be adjusted.

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