Brake system for festival cart

Abstract

To provide a brake system for a festival cart that is easy to maintain.SOLUTION: A brake system for a festival cart, in which an axle 3 is detachably attached to a festival cart main body and a wheel 4 is rotatably supported on the axle 3, includes a disc brake device. The disc brake device includes a brake rotor 30 that rotates integrally with the wheel 4, and a caliper 31 that brakes the brake rotor 30. The brake rotor 30 is provided so as to be movable together with the wheel 4 within a predetermined range in an axial direction relative to the axle 3, and the disc brake device includes a follow-up mechanism portion that causes the caliper 31 to follow axial movement of the brake rotor 30.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a brake system used in floats such as danjiri, floats, hoko, and yatai. [Background technology]

[0002] Danjiri floats use drum-type brakes, such as those described in Patent Document 1 below. In drum-type brakes, a brake band is wrapped around the outer surface of a brake drum attached to a wheel. The brake drum can be braked by tightening the brake band. However, it is difficult to fine-tune the contact between the brake band and the brake drum. In other words, it is not easy to adjust the band to ensure stable braking force. Furthermore, while using a brake band with high friction resistance increases braking force, there is a problem in that the brake band is likely to produce an abnormal flapping noise while the danjiri is moving, making it difficult to adjust the band to prevent abnormal noise while moving. Furthermore, brake bands are prone to deterioration, and as deterioration progresses, band adjustment becomes even more difficult. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 11-148520 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a paddock brake system that is easy to maintain. [Means for solving the problem]

[0005] The brake system for a float of the present invention is a brake system for a float in which an axle is detachably attached to the float body and a wheel is rotatably supported on the axle, and the brake system is provided with a disc brake device, which includes a brake rotor that rotates integrally with the wheel and a caliper that brakes the brake rotor.

[0006] This configuration includes a disc brake device having a brake rotor and a caliper, which eliminates the need for band adjustment as in the past, simplifies maintenance, and makes it easy to obtain stable braking force.

[0007] In particular, it is preferable that the brake rotor and wheel are arranged to be movable within a predetermined range in the axial direction relative to the axle, and that the disc brake device be equipped with a tracking mechanism that causes the caliper to follow the axial movement of the brake rotor. With this configuration, the brake rotor and wheel are movable within a predetermined range in the axial direction relative to the axle. Therefore, even if the float body or wheel is made of wood, for example, the brake rotor and wheel can move slightly in the axial direction, easily absorbing distortion of the float body or wheel during movement. Meanwhile, since the caliper moves axially in response to the axial movement of the brake rotor, the axial positional relationship between the brake rotor and the caliper is maintained. Therefore, even if the brake rotor moves axially together with the axle when the float is running, the caliper can reliably clamp the brake rotor in the axial direction, and a predetermined braking force can be reliably applied to the brake rotor.

[0008] Furthermore, it is preferable that the tracking mechanism includes a base tube attached to the wheel and rotatably supported on the axle, and a caliper base that rotatably supports the base tube from the radially outer side and is movable axially integrally with the base tube, wherein the brake rotor is attached to the base tube and the caliper is attached to the caliper base. According to this configuration, the brake rotor is attached to the base tube and the caliper is attached to the caliper base. The caliper base rotatably supports the base tube from the radially outer side and moves axially integrally with the base tube. Therefore, the caliper attached to the caliper base can move axially together with the brake rotor via the base tube, and the axial positional relationship between the caliper and the brake rotor can be easily maintained.

[0009] Furthermore, it is preferable that the follow-up mechanism is provided with a base guide attached to the platform body to guide the axial movement of the caliper base. With this configuration, the base guide guides the axial movement of the caliper base, allowing the caliper base to move smoothly in the axial direction, and therefore the caliper can also move smoothly in the axial direction and easily follow the brake rotor.

[0010] Furthermore, it is preferable that the axle be configured to be removed from the carriage body with the wheel attached, and that the caliper base be provided with a holding base and an attachment base that can be connected and separated from each other, the holding base be attached to the base cylinder so as to rotatably support the base cylinder from the radially outer side, the attachment base be attached to the carriage body so as to be axially movable, and the caliper be attached to the attachment base. With this configuration, the axle can be removed from the carriage body when replacing the wheel. The wheel is attached to the axle, and the base cylinder and brake rotor are also attached to the axle, and these are removed together with the axle from the carriage body. At this time, the holding base can be separated from the attachment base. Therefore, the holding base is removed from the carriage body together with the axle, while the attachment base remains on the carriage body. In other words, when removing the axle from the carriage body, the wheel, brake rotor, base cylinder, and holding base can be removed together with the axle from the carriage body. After replacing the wheels, the axles can be attached to the carriage body, and then the mounting base can be connected to the holding base. This makes it easy to replace the wheels.

[0011] On the other hand, it is preferable that the axle be configured to be removed from the carriage body with the wheel attached, and the disc brake device include a mounting base to which a caliper is attached, and that the mounting base is attached to the carriage body so as to be movable between a braking position where the caliper brakes the brake rotor and a retracted position where the caliper is positioned radially outward from the brake rotor and does not interfere with removal of the axle. According to this configuration, the axle is removed from the carriage body when replacing the wheel. The wheel is attached to the axle, and the brake rotor can also be removed from the carriage body together with the wheel while still attached to the axle. In this case, the mounting base to which the caliper is attached can be moved from the braking position to the retracted position. Therefore, the brake rotor can be easily removed from the carriage body together with the axle, facilitating wheel replacement work.

[0012] In particular, it is preferable that the axle be configured to be removed downward from the float body, and that the mounting base be rotatable up and down about an axis parallel to the axle, and be rotated upward from the brake position to a retracted position. With this configuration, when the axle is removed downward from the float body, the mounting base can be rotated upward and retracted to the retracted position. Therefore, when the axle is removed downward from the float body, the mounting base can be easily retracted, facilitating the axle removal work.

[0013] Preferably, the disc brake device further comprises a holding base attached to the axle, the mounting base being connectable to and detachable from the holding base, such that when the mounting base is connected to the holding base, the mounting base is held in the braking position, and when the mounting base is detached from the holding base, the mounting base is movable between the braking position and the retracted position. With this configuration, when the axle is removed from the platform body, the mounting base can be detached from the holding base and retracted to the retracted position. Then, after the axle is attached to the platform body, the mounting base can be connected to the holding base to hold the mounting base in the braking position.

[0014] In particular, the disc brake device preferably includes a restricting portion that restricts movement of the mounting base toward the axle beyond the brake position within a predetermined range. With this configuration, even if the mounting base attempts to move radially inward beyond the brake position when connecting the mounting base to the retaining base, the restricting portion prevents this. This makes it easy to connect the mounting base to the retaining base, facilitating wheel replacement.

[0015] Furthermore, it is preferable that the mounting base has an abutment portion that can abut against the regulating portion, and when the abutment portion abuts against the regulating portion, movement of the mounting base toward the axle beyond the brake position is restricted, and when the abutment portion abuts against the regulating portion, a gap is secured between the outer peripheral surface of the brake rotor and a radially opposing surface of the caliper that faces radially outward from the outer peripheral surface of the brake rotor. According to this configuration, when the abutment portion of the mounting base abuts against the regulating portion, a gap is formed between the outer peripheral surface of the brake rotor and the radially opposing surface of the caliper, so that collision between the radially opposing surface of the caliper and the outer peripheral surface of the brake rotor is avoided and damage to the caliper and the brake rotor can be prevented. [Effects of the Invention]

[0016] As described above, by providing a disc brake device, band adjustment as in the past is no longer necessary, maintenance is easier, deterioration over time is less likely to occur, and stable braking force can be obtained. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a view of the main parts of a float according to one embodiment of the present invention, seen from the right side. [Figure 2] A cross-sectional view of the main parts of the float from the right side. [Figure 3] A cross-sectional view of the main parts of the float seen from the rear. [Figure 4] FIG. 4 is an enlarged view of the main part of FIG. 3. [Figure 5] FIG. 4 is an enlarged view of the main part of FIG. 3. [Figure 6] The figure shows the base cylinder of the braking system of the same carriage, (a) is a cross-sectional view, and (b) is a front view. [Figure 7] FIG. 2 is a cross-sectional view showing the assembly process of the main parts of the brake system of the same float. [Figure 8] A cross-sectional view of the main parts of the float from the right side. [Figure 9] 9 is an enlarged view of a main part of FIG. 8, in which (a) shows a normal state and (b) shows a restricted state. [Figure 10]FIG. 2 is an enlarged view of a main part showing the positional relationship between the caliper and the brake rotor of the brake system. [Figure 11] (a) and (b) are cross-sectional views from the right side showing the wheel replacement work on the same float. [Figure 12] A cross-sectional view from the right side showing the wheel replacement process on the same float. [Figure 13] FIG. 10 is a cross-sectional view of the main part of the float, seen from the rear, showing the wheel replacement work. [Figure 14] FIG. 10 is a cross-sectional view of the main part of the float, seen from the rear, showing the wheel replacement work. [Figure 15] FIG. 10 is a cross-sectional view of the main part of the float, seen from the rear, showing the wheel replacement work. [Figure 16] FIG. 10 is a cross-sectional view of the main part of the float, seen from the rear, showing the wheel replacement work. [Figure 17] 10(a) and 10(b) are views of the main parts of a paddock brake system according to another embodiment of the present invention, as viewed from the right side. [Figure 18] (a) and (b) are cross-sectional views of the main parts of the brake system as seen from the right side. [Figure 19] A view of the main parts of the brake system from the right side. [Figure 20] FIG. 10 is a right-side view of the main parts of a paddock brake system according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] A description will now be given of a danjiri (traditional Japanese float) brake system according to one embodiment of the present invention and a danjiri (traditional Japanese float) equipped with the system, with reference to the drawings. In this embodiment, a danjiri (traditional Japanese float) will be used as an example of the danjiri 1. An overview of the danjiri 1 is shown in FIG. 1. In FIG. 1, the front-to-rear direction is indicated by an arrow X, with the right side of the paper in FIG. 1 being the front side, and the front side being indicated by the symbol X1, and the rear side being indicated by the symbol X2.

[0019] The float 1 comprises a float body 2, axles 3, and wheels 4. The float body 2 comprises a base 5 and a main body 6 placed on the base 5. The float body 2 is made of wood. The base 5 is formed in a frame shape. The base 5 is also called a stock. The base 5 comprises a pair of left and right square bar-shaped vertical frame members 7 extending in the front-to-rear direction, and a pair of front and rear square bar-shaped horizontal frame members 8 extending in the left-to-right direction so as to connect the left and right vertical frame members 7. The vertical frame members 7 protrude further forward than the front horizontal frame member 8, and protrude further rearward than the rear horizontal frame member 8.

[0020] The axles 3 are also called core rods. The axles 3 are made of metal, specifically iron, but may also be made of wood. The axles 3 are round bar-shaped. The axles 3 extend in the left-right direction and are provided in pairs, one at the front and one at the rear. The front axle 3 is located rearward of the front horizontal frame member 8, and the rear axle 3 is located forward of the rear horizontal frame member 8.

[0021] The axle 3 is located below the base 5. A semicircular upper groove 7a (see Figure 14) is formed on the underside of the vertical frame member 7 of the base 5, and the axle 3 fits into this upper groove 7a. The axle 3 is also supported from below by an axle support member 9. The axle support member 9 is also called a cat stand. A semicircular lower groove 9a (see Figure 13) is also formed on the upper surface of the axle support member 9, and the axle 3 fits into this lower groove 9a. The axle 3 is held in place by being sandwiched between the vertical frame member 7 of the base 5 and the axle support member 9. The axle support member 9 is detachably attached to the vertical frame member 7, for example, by bolts. By removing the axle support member 9 downward from the vertical frame member 7, the axle 3 is released from the base 5 and can be removed from the platform cart body 2.

[0022] The axial direction of the axle 3 will be simply referred to as the axial direction, and the radial direction of the axle 3 will be simply referred to as the radial direction. In the following description, the axially inner side and the axially outer side will be based on the axle 3. Furthermore, the radially outer side and the radially inner side will be based on the axle 3. Therefore, the radially outer side of the axle 3 will be simply referred to as the radially outer side, and the radially inner side of the axle 3 will be simply referred to as the radially inner side.

[0023] The float 1 is provided with a total of four wheels 4, one each at the front, rear, left and right. That is, the wheels 4 consist of a pair of front wheels on the left and right, and a pair of rear wheels on the left and right. The wheels 4 are made of wood and are also called koma. All four wheels 4 are located inside the base 5 in a plan view, and are located inside the pair of vertical frame members 7 on the left and right. Figure 3 is a view of the front wheels as seen from the rear. The wheels 4 are arranged close to each other on the axial inside of the vertical frame members 7 with a small gap between them. The wheels 4 are attached to the axles 3 in pairs on the left and right.

[0024] The wheel 4 is rotatably mounted on the axle 3. As shown in Figures 5 and 16, a through hole 4a is formed in the center of the wheel 4, penetrating in the axial direction, and a wheel bearing 10 is fitted into the through hole 4a. The wheel bearing 10 is made of metal and is also called a gutter. The wheel bearing 10 is detachably attached to the wheel 4 with a bolt 16 and a nut 17. The axle 3 passes through the wheel bearing 10, and the wheel bearing 10 rotates integrally with the wheel 4 relative to the axle 3.

[0025] The wheel bearing 10 has a bearing sleeve 11 and a bearing flange 12 provided at one end (the axially inner end) of the bearing sleeve 11 and protruding radially outward. The axle 3 is inserted radially inside the bearing sleeve 11. The outer peripheral surface of the bearing sleeve 11 is tapered toward the other end of the bearing sleeve 11, i.e., toward the axially outer side. The inner peripheral surface of the through hole 4a of the wheel 4 is also tapered axially outward. The wheel bearing 10 is removably attached to the wheel 4 from the axially inner side. The bearing flange 12 is rectangular, specifically square, when viewed axially, and four bolts 16 are inserted axially into its four corners. As shown in FIG. 16 , a square-shaped recess 4b is formed on the axially inner end face of the wheel 4, and the bearing flange 12 fits into the recess 4b of the wheel 4. The wheel bearing 10 is attached to the wheel 4 so that the bearing flange 12 does not protrude from the wheel 4. In other words, the end faces of the bearing flange 12 and the wheel 4 are substantially flush with each other. A circular fitting recess 13 is formed in the center of the end face of the bearing flange 12.

[0026] In this embodiment, the wheel bearing 10 is composed of two parts: a bearing sleeve 14 and a bearing plate 15. The bearing plate 15 is joined to one end of the bearing sleeve 14 by welding, forming an integrated unit. The bearing sleeve 14 forms the main part of the bearing tube portion 11, and the bearing plate 15 forms the bearing flange portion 12.

[0027] As described above, the wheel 4 is rotatably supported on the axle 3, but is also movable axially relative to the axle 3 within a predetermined range. The movable range is within 20 mm, preferably 1 to 10 mm. A stopper sleeve 20 is attached near the center of the axle 3. The stopper sleeve 20 is cylindrical and preferably made of metal. The stopper sleeve 20 is fixed to the axle 3, for example, by screws. As shown in FIG. 3, a stopper sleeve 20 is provided for each of the left and right wheels 4, spaced apart from each other. However, a single stopper sleeve 20 may be provided at the center of the axle 3 for both the left and right wheels 4. The stopper sleeve 20 restricts the wheel 4 from moving inward in the axial direction. As shown in FIG. 4, a sliding washer 21 is attached to the axially outer end face of the stopper sleeve 20. The sliding washer 21 can be attached by any method, for example, by screws. The sliding washer 21 is preferably made of resin.

[0028] On the other hand, the outward axial movement of the wheel 4 is restricted by the vertical frame member 7 of the base portion 5. Figure 5 shows the vicinity of the axially outer end face of the wheel 4. A semi-disk-shaped wear-resistant material 22 is embedded in the axially inner side of the vertical frame member 7, with the axle 3 at its center. The wear-resistant material 22 is made of metal. An outer washer 23 is arranged between the vertical frame member 7 and the wheel 4. The outer washer 23 is made of metal and is hard-plated. A thrust bearing 24 is arranged axially inside the outer washer 23, and an inner washer 25 is arranged axially inside the thrust bearing 24. The outer washer 23 has a larger diameter than the through hole 4a of the wheel 4, a larger diameter than the thrust bearing 24, and a larger diameter than the inner washer 25. The inner washer 25 is made of resin. The axially outer end face of the bearing sleeve portion 11 of the wheel bearing 10 faces the axially inner side of the inner washer 25. The inner washer 25 is located radially inside the through hole 4a of the wheel 4, and most of the thrust bearing 24 is also located radially inside the through hole 4a. The inner washer 25 has a larger diameter than the thrust bearing 24.

[0029] The axle 3 has the inner washer 25, thrust bearing 24, and outer washer 23 inserted through it in that order. The outer washer 23, thrust bearing 24, and inner washer 25 can move axially independently relative to the axle 3. Note that in FIG. 5 and other figures, the outer washer 23, thrust bearing 24, and inner washer 25 are in contact with each other, and the inner washer 25 is in contact with the wheel bearing 10, but the outer washer 23, thrust bearing 24, inner washer 25, and wheel 4 can move axially independently from each other. Therefore, for example, a gap may be formed between the outer washer 23 and thrust bearing 24, a gap may be formed between the thrust bearing 24 and inner washer 25, or a gap may be formed between the inner washer 25 and wheel bearing 10.

[0030] FIG. 5 shows the state in which the wheel 4 has moved most axially inward. FIG. 5 also shows a state in which a gap exists between the outer washer 23 and the vertical frame member 7 of the base 5, specifically, between the outer washer 23 and the wear-resistant material 22. This gap is the wheel 4's movement allowance (length of movement), which is approximately several millimeters as described above. When the wheel 4 moves axially outward (to the right side of the paper in FIG. 5 ), the inner washer 25, thrust bearing 24, and outer washer 23 also move axially outward, until the outer washer 23 abuts against the wear-resistant material 22. Because the wear-resistant material 22 is attached to the axially inner side of the vertical frame member 7 of the base 5, the outer washer 23 abuts against the wear-resistant material 22. This prevents the outer washer 23 from directly contacting the wooden vertical frame member 7, thereby preventing damage such as wear to the vertical frame member 7.

[0031] The brake system includes a disc brake device. The disc brake device in this embodiment is hydraulic. The disc brake device includes a brake rotor 30 attached to the wheel 4 and rotating integrally with the wheel 4, and a caliper 31 attached to the platform car body 2 and braking the brake rotor 30. The brake system is for the front wheels and brakes the front wheels. The brake rotor 30 and the caliper 31 are provided on the left and right wheels 4 (front wheels), respectively, and are provided symmetrically with respect to each other.

[0032] As shown in Figures 1 and 2, a platform 2a is provided at the front end of the platform body 2 for an operator, such as a towing manager, to operate the brakes. A brake pedal 40 is located in front of the platform 2a. As shown in Figure 2, the brake pedal 40 is attached to the upper end of a first link 41. A front bracket 44 is attached to the front surface of the front horizontal frame member 8 of the base 5. A front support shaft 45 extending in the left-right direction is provided on the front bracket 44, and the middle portion of the first link 41 is supported on the front support shaft 45 so as to be rotatable in the up-down direction. The lower end of the first link 41 is rotatably connected to the front end of a second link 42. The second link 42 extends in the front-rear direction below the front horizontal frame member 8 of the base 5. The rear end of the second link 42 is located rearward of the front horizontal frame member 8 of the base 5. The rear end of the second link 42 is rotatably connected to the lower end of a third link 43. The third link 43 is rotatably supported by a rear support shaft 47 of a rear bracket 46 .

[0033] A cylinder bracket 48 is attached to the rear surface of the front horizontal frame member 8. A master cylinder 49, which is a hydraulic cylinder, is attached to the cylinder bracket 48. The master cylinder 49 has an axis in the front-to-rear direction, and the upper end of the third link 43 is connected to the rear end of the master cylinder 49. A rear bracket 46 is provided on the cylinder bracket 48, and a rear support shaft 47 has an axis in the left-to-right direction, and the middle portion of the third link 43 is supported on the rear support shaft 47 so as to be rotatable in the up-and-down direction.

[0034] When the operator depresses the brake pedal 40, the first link 41 rotates, moving the second link 42 rearward, and the upper end of the third link 43 forward. The upper end of the third link 43 then pushes the master cylinder 49 forward, and brake fluid is sent to the left and right calipers 31 via the supply hose 51. Therefore, the brake system simultaneously brakes both the left and right wheels 4 using the single master cylinder 49. When the operator releases the brake pedal 40, the brake pedal 40 automatically returns to its original position, releasing the brake. The reserve hose 50 is connected to a reserve tank (not shown), which stores brake fluid. The reserve tank is attached to the base 5, for example. As shown in FIG. 3 , the master cylinder 49 is located in the center of the base 5 in the left-right direction (center in the axial direction), and the supply hose 51 branches left and right and connects to the left and right calipers 31. The caliper 31 and the brake rotor 30 are arranged symmetrically on the left and right sides, and are located axially inside the left and right wheels 4. Since the structure of the disc brake device is symmetrical on the left and right sides, the device on the right side will be described in detail below.

[0035] As described above, the wheel 4 can move axially within a predetermined range relative to the axle 3. Because the brake rotor 30 is attached to the wheel 4, the brake rotor 30 also moves axially together with the wheel 4. The disc brake device is equipped with a tracking mechanism that causes the caliper 31 to follow the axial movement of the brake rotor 30. As shown in Figure 4, the tracking mechanism includes a base tube 60 attached to the axle 3, a caliper base 61 that rotatably supports the base tube 60 from the radially outer side, and a base guide 100 that is attached to the platform body 2 and guides the axial movement of the caliper base 61.

[0036] The axle shaft 3 passes through the base tube 60 in the axial direction. The base tube 60 is detachably attached to the axle shaft 3 and rotatably supported by the axle shaft 3. The base tube 60 is adjacent to the inside of the wheel 4 in the axial direction and is detachably attached to the wheel 4 in the axial direction by fastening together with the wheel bearing 10 with the four bolts 16 mentioned above. The inner circumferential surface of the base tube 60 has a larger diameter than the outer circumferential surface of the axle shaft 3, and a gap is provided between the inner circumferential surface of the base tube 60 and the outer circumferential surface of the axle shaft 3. The radial gap between the inner circumferential surface of the base tube 60 and the outer circumferential surface of the axle shaft 3 is larger than the radial gap between the inner circumferential surface of the wheel bearing 10 and the outer circumferential surface of the axle shaft 3. Therefore, the inner circumferential surface of the wheel bearing 10 slides against the outer circumferential surface of the axle shaft 3, while the inner circumferential surface of the base tube 60 does not slide against the outer circumferential surface of the axle shaft 3.

[0037] Figure 6 shows the base tube 60 in detail. The base tube 60 comprises a base tube portion 62, and a wheel mounting flange portion 63 and a rotor mounting flange portion 64 that protrude radially outward from the base tube portion 62. The axle 3 is inserted through the base tube portion 62. The wheel mounting flange portion 63 is provided at the axially outer end of the base tube portion 62. The rotor mounting flange portion 64 is spaced axially inward from the wheel mounting flange portion 63. The rotor mounting flange portion 64 is located midway in the axial direction of the base tube portion 62.

[0038] The wheel mounting flange 63 is rectangular, specifically square, and has a shape and size corresponding to the bearing flange 12 of the wheel bearing 10, with bolt insertion holes 65 formed in its four corners for inserting bolts 16. As shown by the two-dot chain line in Figure 6(a), the wheel mounting flange 63 is placed on the axially inner side of the bearing flange 12 of the wheel bearing 10. In addition, a circular fitting protrusion 66 is provided on the axially outer end face of the base tube 60, and this fitting protrusion 66 fits into the fitting recess 13 of the bearing flange 12.

[0039] As shown by the two-dot chain line in Figure 6(a), the brake rotor 30 is detachably attached to the rotor attachment flange portion 64 by screwing. The brake rotor 30 is disk-shaped. The brake rotor 30 is positioned axially inwardly away from the wheel 4. The brake rotor 30 is attached to the wheel 4 via the base tube 60 and the wheel bearing 10, and rotates integrally with the wheel 4 while moving axially within a predetermined range. The brake rotor 30 is placed on the rotor attachment flange portion 64 from the axially inner side and screwed from the axially inner side.

[0040] The outer peripheral surface of the axially inner end of the base tube portion 62 has a smaller diameter, and a ball bearing 67 is attached to the outer peripheral surface of this end as shown by the two-dot chain line in FIG. 6(a). A retaining base 80 is provided radially outward of the ball bearing 67 as shown by the two-dot chain line in FIG. 6(a). The retaining base 80 rotatably supports the base tube 60 from the radially outer side via the ball bearing 67. The retaining base 80, together with a mounting base 90 (described later), constitutes the caliper base 61. The retaining base 80 is disk-shaped. The retaining base 80 has a smaller diameter than the brake rotor 30. The retaining base 80 is located axially inward and spaced apart from the brake rotor 30. The retaining base 80 consists of a small diameter portion 81 and a large diameter portion 82 adjacent to the axially inner side of the small diameter portion 81.

[0041] To explain the component configuration of the holding base 80, the holding base 80 is made up of a ring-shaped base main body 83 and a ring-shaped outer ring holder 84 that is screwed onto the axial outside of the base main body 83. The base main body 83 functions as a bearing holder. The base main body 83 supports the outer ring of the ball bearing 67 from the axial inside, and the outer ring holder 84 supports the outer ring of the ball bearing 67 from the axial outside. The outer ring of the ball bearing 67 is clamped in the axial direction between the base main body 83 and the outer ring holder 84.

[0042] Meanwhile, a ring-shaped inner ring holder 68 is screwed to the axially inner end face of the base tube 60. The inner ring of the ball bearing 67 abuts against an inner step 70 formed on the outer peripheral surface of the axially inner end face of the base tube 60, and is supported from the axially outer side, and is also supported from the axially inner side by the inner ring holder 68. Therefore, the inner ring of the ball bearing 67 is sandwiched in the axial direction between the inner step 70 of the base tube 60 and the inner ring holder 68. The axially inner end face of the inner ring holder 68 can abut against the sliding washer 21 of the stopper sleeve 20 described above, and can slide on the sliding washer 21 when the wheel 4 rotates. The holding base 80, ball bearing 67, and inner ring holder 68 move in the axial direction together with the base tube 60.

[0043] 7 shows the order in which components are attached to the base tube 60. The brake rotor 30 is attached to the base tube 60 from the inside in the axial direction, followed by the outer ring retainer 84, ball bearing 67, and base body 83, in that order, and finally the inner ring retainer 68 is screwed in. The inner diameter of the inner ring retainer 68 is smaller than the inner diameter of the base tube 60 and is approximately the same as the diameter of the axle 3. Therefore, the inner peripheral surface of the inner ring retainer 68 slides against the outer peripheral surface of the axle 3 together with the inner peripheral surface of the wheel bearing 10.

[0044] Although the base tube 60 may be made up of a single component, in this embodiment it is made up of multiple components joined together. Specifically, the base tube 60 is made up of three components: a base sleeve 71, a wheel mounting ring 72, and a rotor mounting ring 73. The wheel mounting ring 72 and rotor mounting ring 73 are welded to the base sleeve 71 to form an integrated unit. The wheel mounting ring 72 is welded to the axially outer end face of the base sleeve 71. A positioning step 74 is formed in the middle of the base sleeve 71, and the axially outer end face of the rotor mounting ring 73 abuts against this positioning step 74, thereby positioning the rotor mounting ring 73 in the axial direction relative to the base sleeve 71.

[0045] 4 and 8, the mounting base 90 is detachably attached to the holding base 80. The mounting base 90 constitutes the caliper base 61 together with the holding base 80. The mounting base 90 is connectable to and detachable from the holding base 80. The mounting base 90 is preferably fastened to the holding base 80 by screws. The mounting base 90 is fastened to the large diameter portion 82 of the holding base 80 by screws. The mounting base 90 is placed on the axially outer end face of the large diameter portion 82 of the holding base 80 and fastened by screws from the holding base 80 side, i.e., from the axially inner side.

[0046] The mounting base 90 is attached to the platform cart body 2 so as to be rotatable in the up-down direction and supported so as to be movable in the axial direction. Specifically, a base guide 100 is attached to the upper end of the rear surface of the front horizontal frame member 8 of the base 5. The base guide 100 includes a guide bracket 101 screwed to the rear surface of the front horizontal frame member 8 and a base support shaft 102 that guides the mounting base 90 in the axial direction and serves as a pivot point for the mounting base 90. The guide bracket 101 includes a mounting plate portion 103 screwed to the rear surface of the front horizontal frame member 8 and a pair of left and right support plate portions 104 protruding rearward from the mounting plate portion 103. The base support shaft 102 is attached to the support plate portion 104. The base support shaft 102 is aligned along the axial direction (left-right direction). That is, the base support shaft 102 is arranged parallel to the axle 3. The base support shaft 102 is located forward and above the axle 3. In addition, the base spindle 102 is located forward of and above the radial inner end 90a of the mounting base 90 when connected to the holding base 80. Furthermore, the base spindle 102 is located forward of and above the caliper 31. A guide hole 91 is formed in the mounting base 90, and the base spindle 102 is inserted through the guide hole 91 with some play. The mounting base 90 is located between the left and right support plate portions 104.

[0047] When separated from the holding base 80, the mounting base 90 can rotate (swing) up and down around the base support shaft 102. Specifically, the mounting base 90 can rotate between a braking position and a retracted position. The braking position is a position where the caliper 31 brakes the brake rotor 30. FIGS. 4 and 8 show the mounting base 90 in the braking position. Note that the front view is when viewed from the axially outer side, i.e., from the right side, as in FIG. 8. The retracted position is a position where the caliper 31 is spaced radially outward from the brake rotor 30 and does not interfere with removal of the axle 3. Specifically, the retracted position is a position where the caliper 31 is spaced radially outward and upward from the brake rotor 30. The mounting base 90 rotates upward from the retracted position to the retracted position and downward from the retracted position to the braking position. 11(a) and 12 show the mounting base 90 in the retracted position. In the braking position, the radially inner end 90a of the mounting base 90 approaches the axle 3, and in the retracted position, the radially inner end 90a of the mounting base 90 moves away from the axle 3.

[0048] As shown in Figure 8, it is preferable to attach an operating lever 92 to the mounting base 90. The operating lever 92 extends rearward from the mounting base 90, and by gripping and operating the operating lever 92 up and down, the mounting base 90 can be easily rotated up and down. The base 5 is preferably provided with a holding portion for holding the mounting base 90 in the retracted position. As the holding portion, a holding hook 93 is attached to the base 5. The mounting base 90 can be held in the retracted position by hooking the operating lever 92 onto the holding hook 93. As shown by the two-dot chain lines in Figures 3 and 4, a support rod 94 is provided to bridge the left and right vertical frame members 7, and the holding hook 93 is attached to the support rod 94.

[0049] The mounting base 90 is guided axially by the base support shaft 102, using the base support shaft 102 as a guide. When the mounting base 90 is connected to the holding base 80, the mounting base 90 cannot rotate up and down around the base support shaft 102 as a fulcrum and is held in the brake position. However, the mounting base 90 can move axially along the base support shaft 102. The guide hole 91 has a larger diameter than the base support shaft 102, and a gap is provided between the guide hole 91 and the outer peripheral surface of the base support shaft 102. In this embodiment, the base support shaft 102 is formed by a bolt. Furthermore, the mounting plate portion 103 may be provided separately for each of the left and right wheels 4, but in this embodiment, the left and right wheels are integrally provided. That is, one mounting plate portion 103 is provided with a pair of left and right support plate portions 104 for the right wheel 4 and a pair of left and right support plate portions 104 for the left wheel 4.

[0050] When viewed from the rear side as shown in FIG. 4 , the mounting base 90 extends radially outward from the holding base 80. The mounting base 90 protrudes radially outward beyond the brake rotor 30 and also protrudes radially outward beyond the wheel 4. The mounting base 90 has a radially inner end 90a that is the end closest to the axle 3 and a radially outer end 90b that is the end farthest from the axle 3. The radially inner end 90a of the mounting base 90 is attached to the holding base 80. More specifically, the radially inner end 90a of the mounting base 90 is overlapped with the radially outer surface of the large diameter portion 82 of the holding base 80 and screwed in place. The mounting base 90 is attached to the top of the holding base 80. A guide hole 91 is formed in the radially outer end 90b of the mounting base 90, and the mounting base 90 is supported by a base support shaft 102.

[0051] The mounting base 90 is plate-shaped with its thickness direction in the axial direction. As shown in FIG. 8 , the mounting base 90 is L-shaped when viewed from the front. The mounting base 90 extends upward from its radially inner end 90a and then forward to its radially outer end 90b. That is, the mounting base 90 extends in the up-down direction at the radially inner end 90a and in the front-rear direction at the radially outer end 90b. In other words, the radially inner end 90a of the mounting base 90 is oriented radially and also in the up-down direction, while the radially outer end 90b of the mounting base 90 is oriented in the front-rear direction. The radially inner end 90a of the mounting base 90 is the lower end and rear end of the mounting base 90. The radially outer end 90b of the mounting base 90 is the upper end and front end of the mounting base 90. The radially inner end 90a of the mounting base 90 is located directly above the axle 3.

[0052] The mounting base 90 does not have a constant width in a front view, but gradually narrows from the radially inner end 90a to the radially outer end 90b. That is, if the radially inner end 90a is the base end and the radially outer end 90b is the tip end, the mounting base 90 has a tapered shape in a front-to-back direction, gradually narrowing toward the tip end. The width of the mounting base 90 is the dimension in the front-to-rear direction near the radially inner end 90a, and the dimension in the up-to-down direction near the radially outer end 90b. The mounting base 90 extends upward from the radially inner end 90a with a substantially constant width over a predetermined length, then gradually narrows as it turns forward, and again extends forward with a substantially constant width near the radially outer end 90b.

[0053] FIG. 9(a) schematically shows the vicinity of the radially inner end 90a of the mounting base 90. FIG. 9(a) shows the state in which the mounting base 90 is connected to the holding base 80. The mounting base 90 is screwed to the holding base 80 at two locations, front and rear, at the radially inner end 90a. The end face of the radially inner end 90a of the mounting base 90 faces the outer circumferential surface of the small diameter portion 81 of the holding base 80. The end face of the radially inner end 90a of the mounting base 90 faces the uppermost part of the outer circumferential surface of the small diameter portion 81 of the holding base 80 from above. A curved opposing surface 95 that curves radially outward is formed on the end face of the radially inner end 90a of the mounting base 90, and the curved opposing surface 95 faces the apex of the outer circumferential surface of the small diameter portion 81 of the holding base 80. A small gap is formed between the curved opposing surface 95 of the mounting base 90 and the apex of the small diameter portion 81 of the holding base 80, but they may also be in contact with each other. This gap is, for example, several mm, specifically 5 mm or less, and preferably 1 to 3 mm.

[0054] When connecting the mounting base 90 to the holding base 80, the small diameter portion 81 of the holding base 80 supports the holding base 80 from the radially inner side. As described above, the mounting base 90 rotates up and down around the base support shaft 102 as a rotation fulcrum. When attaching the mounting base 90 to the holding base 80, the mounting base 90 is rotated downward to approach the small diameter portion 81 of the holding base 80. At this time, the curved opposing surface 95 of the mounting base 90 can be abutted against the small diameter portion 81 of the holding base 80. As shown in FIG. 9(b), when the curved opposing surface 95 of the mounting base 90 abuts against the small diameter portion 81 of the holding base 80, the mounting base 90 cannot be rotated further downward. In other words, the small diameter portion 81 of the holding base 80 is a restricting portion that restricts radially inward movement of the mounting base 90 beyond the brake position to within a predetermined range. Furthermore, the curved opposing surface 95 of the mounting base 90 is an abutting portion that can abut against the restricting portion.

[0055] In this way, the small diameter portion 81 of the holding base 80 restricts excessive downward rotation of the mounting base 90, so that the mounting base 90 can be easily attached to the holding base 80. As described above, in this embodiment, the mounting base 90 is screwed to the holding base 80, and the screwing direction is the axial direction. A gap exists between the screw and the screw hole of the holding base 80. When the mounting base 90 is screwed to the holding base 80, the curved opposing surface 95 of the mounting base 90 abuts against the small diameter portion 81 of the holding base 80, so that the mounting base 90 can be easily screwed to the holding base 80.

[0056] As shown in Figures 4 and 8, a caliper 31 is attached to a mounting base 90. The caliper 31 is attached to the axially outer surface of the mounting base 90 and is located axially between the mounting base 90 and the wheel 4. A caliper bracket 96 is screwed to the axially outer surface of the mounting base 90. The caliper bracket 96 is L-shaped when viewed from the rear as shown in Figure 4. The caliper 31 is screwed to the underside of the caliper bracket 96. The caliper 31 is located directly above the axle 3 and axially clamps the top of the brake rotor 30. The caliper 31 has a caliper groove 32 into which the brake rotor 30 fits. The caliper 31 is attached horizontally so that the caliper groove 32 is aligned in the fore-and-aft direction. Therefore, when viewed from the rear of the axle 3 as shown in Figure 12, the caliper groove 32 can be easily seen while operating the operating lever 92 to rotate the mounting base 90 up and down. The operating lever 92 is preferably attached to the caliper bracket 96, and is particularly preferably fastened in the axial direction with a screw.

[0057] The caliper 31 may be of an opposed piston type or a floating type, but is of an opposed piston type in this embodiment. The caliper 31 has a pair of pistons (not shown) that are opposed in the axial direction, and applies a braking force to the brake rotor 30 by clamping the brake rotor 30 in the axial direction between a pair of brake pads (not shown) that are opposed in the axial direction.

[0058] The caliper 31 has a radially opposing surface 33 at the deepest part of the caliper groove 32 that faces the outer peripheral surface 30a of the brake rotor 30 from the radially outer side. When the mounting base 90 is in the braking position as shown in Figures 4 and 8, the radially opposing surface 33 of the caliper 31 does not abut against the outer peripheral surface 30a of the brake rotor 30, but is spaced radially outward from the outer peripheral surface 30a of the brake rotor 30. In other words, as shown in Figure 10, a predetermined gap is provided between the radially opposing surface 33 of the caliper 31 and the outer peripheral surface 30a of the brake rotor 30. When the mounting base 90 is attached to the holding base 80, if the curved opposing surface 95 of the mounting base 90 abuts against the small diameter portion 81 of the holding base 80 as shown in Figure 9(b), the outer peripheral surface 30a of the brake rotor 30 will come relatively close to the radial opposing surface 33 of the caliper 31 as shown by the two-dot chain line in Figure 10, but even in this case, the outer peripheral surface 30a of the brake rotor 30 will not abut against the radial opposing surface 33 of the caliper 31, and a gap will be maintained. Therefore, when the mounting base 90 is connected to the holding base 80, the outer peripheral surface 30a of the brake rotor 30 will be prevented from strongly colliding with the radial opposing surface 33 of the caliper 31, and damage to the brake rotor 30 can be prevented.

[0059] Next, the work of replacing the wheels 4 on the land wheel 1 will be described. The procedure for replacing the wheels 4 is shown in Figures 11 to 16. First, the screws fastening the mounting base 90 to the holding base 80 are removed, and the mounting base 90 is separated from the holding base 80. Then, as shown in Figures 11(a) and 12, the operating lever 92 is lifted upward to move the mounting base 90 to the retracted position, and the operating lever 92 is hooked onto the holding hook 93 to hold the mounting base 90 in the retracted position.

[0060] When using wooden wheels 4, the wheels 4 need to be replaced frequently. This can be done without disassembling the float 1, i.e., without removing the main body 6 from the base 5. As shown in Figure 12 , a drum 201 (large drum) is installed on the float 1, and the operator operates the operating lever 92 by crawling into the space between the drum 201 and the ground 200. The operator crouches in the space below the drum 201, with the caliper 31 positioned at eye level. This allows the operator to operate the operating lever 92 up and down while looking at the caliper groove 32. When the operating lever 92 is hooked onto the retaining hook 93, a portion of the mounting base 90 protrudes slightly above the top surface of the vertical frame member 7, but the mounting base 90 and the drum 201 are not in contact with each other. From this perspective, it is preferable that the upper end surface of the mounting base 90 be curved upward in an arc.

[0061] Next, the front axle 3 is jacked up to lift the front part of the platform 1 at an angle, and a support platform (not shown) is placed under the base 5, and the platform holds the platform 1 afloat above the ground 200. Then, as shown in Figure 13, the front axle support member 9 is removed from the vertical frame member 7. By removing the axle support member 9, the axle 3 is released downward, and can be removed downward from the platform body 2.

[0062] Figures 11(b) and 14 show the state in which the axle 3 has been removed from the paddock body 2. In this way, the axle 3 can be removed from the paddock body 2 while the wheels 4 remain attached to the axle 3. The base tube 60, brake rotor 30, and holding base 80 can also be removed all at once from the paddock body 2 while still attached to the axle 3. Because the mounting base 90 has been retracted upward in advance, the axle 3 can be easily removed.

[0063] After removing the axle 3 from the platform car body 2, the wheel 4 is removed from the axle 3. As shown in Figure 15, the outer washer 23, thrust bearing 24, and inner washer 25 are sequentially removed axially outward from the axle 3. The wheel 4 and base tube 60 are then removed as a set from the axle 3. Then, as shown in Figure 16, the bolts 26 and nuts 17 are loosened and removed to separate the wheel 4, wheel bearing 10, and base tube 60. The brake rotor 30 and retaining base 80 remain attached to the base tube 60. In other words, the brake rotor 30 and retaining base 80 attached to the base tube 60 can be separated from the wheel 4 as a single unit. This unit is referred to as the rotor unit. After replacing the wheel 4 with a new one, the rotor unit can be easily assembled to the wheel 4 together with the wheel bearing 10. Because the base tube 60, brake rotor 30, and retaining base 80 are integrated into a single unit, replacing the wheel 4 is easy. Furthermore, because the rotor unit and wheel 4 are attached to and detached from the axle 3 as a set with the rotor unit attached to the wheel 4, there is no need to misalign the axial positional relationship between the wheel 4, brake rotor 30, and retaining base 80. When attaching the wheel 4 to the axle 3, the rotor unit can be brought into contact with the stopper sleeve 20. Specifically, the rotor unit can be brought into contact with the sliding washer 21 attached to the axially outer end face of the stopper sleeve 20, which makes it possible to easily attach the rotor unit and wheel 4 to the specified axial positions.

[0064] After attaching the wheels 4 to the platform cart body 2, the worker can operate the operating lever 92 downward while visually checking the caliper 31 from behind the axle 3, as shown in Figure 12. Although the axial gap between the brake pads of the caliper 31 and the brake rotor 30 is small, the mounting base 90 can be rotated downward while visually checking the caliper groove 32 from behind, thereby bringing the caliper 31 closer to the brake rotor 30. This allows the brake rotor 30 to easily enter the caliper groove 32. In particular, in the braking position, the caliper 31 is located directly above the brake rotor 30, the caliper groove 32 is aligned horizontally, and the radially opposing surface 33 faces downward. This allows the worker sitting behind the axle 3 to easily visually check the caliper groove 32 and the brake rotor 30, making it easy to set the mounting base 90 to the braking position. Furthermore, when the mounting base 90 is screwed to the holding base 80, the small diameter portion 81 of the holding base 80 serves as a support portion that supports the mounting base 90 from below, making it easy to screw in.

[0065] The position of the caliper 31 and the shape of the mounting base 90 can be modified in various ways. In this embodiment, in a front view of the wheel 4 (right front wheel) seen from the right side in the axial direction, the caliper 31 is disposed at a 90-degree position (12 o'clock position) relative to the axle 3. The 0-degree position relative to the axle 3 is a position that is horizontal and forward of the axle 3. However, the position of the caliper 31 relative to the axle 3 is arbitrary, as long as it does not interfere with removing the axle 3 from the platform wheel main body 2. For example, the caliper 31 may be disposed at a 0-degree position (3 o'clock position) or a 180-degree position (9 o'clock position) relative to the axle 3. In other words, the caliper 31 may be disposed in front of or behind the axle 3 rather than directly above the axle 3. The shape of the mounting base 90 can also be modified in various ways depending on the position of the caliper 31.

[0066] For example, an embodiment in which the caliper 31 is disposed diagonally upward and forward with respect to the axle 3 is shown in Figures 17 to 20. In this example, the caliper 31 is disposed at a 45-degree position (1:30 position) with respect to the axle 3, as shown in Figures 17(a) and 19. The caliper 31 can also be disposed on a straight line connecting the base support shaft 102 and the axle 3 when viewed from the front.

[0067] The mounting base 90 may have a shape that gradually narrows from the axle 3 side toward the base support shaft 102 side, i.e., from the radially inner end 90a toward the radially outer end 90b. Specifically, the mounting base 90 has a triangular shape with the radially outer end 90b as its apex, and more specifically, an isosceles triangle shape. The shape of the mounting base 90 may be symmetrical about a center line 110 that extends diagonally upward and forward from the axle 3. In this embodiment, the operating lever 92 is screwed to the end face of the mounting base 90 facing upward.

[0068] The guide hole 91 may also be an elongated hole. The guide hole 91 may be disposed on the center line 110 and have an elongated hole shape extending along the center line 110, as shown in FIG. 20 . However, as shown in FIG. 19 , the guide hole 91 is preferably elongated along a direction inclined relative to the center line 110. The guide hole 91 extends downward from the base support shaft 102 side toward the axle 3 side along a longitudinal direction 111. The longitudinal direction 111 of the guide hole 91 is inclined counterclockwise with respect to the center line 110 at an inclination angle θ in a front view. The inclination angle θ of the guide hole 91 relative to the longitudinal straight line 110 is 90 degrees or less, more specifically, 45 degrees or less. By inclining the guide hole 91 in this manner, the mounting base 90 can be smoothly retracted from the braking position to the retracted position.

[0069] 17 and 18 show the trajectory of the mounting base 90 when it is moved from the brake position to the retracted position when the guide hole 91 is inclined. FIG. 17(a) shows the brake position, and FIG. 18(b) shows the retracted position. When the mounting base 90 is in the brake position as shown in FIG. 17(a), the base support shaft 102 is located near the end of the guide hole 91 farthest from the axle 3. The operator grasps and lifts the operating lever 92 so that the mounting base 90 rises diagonally upward and forward along the longitudinal direction of the guide hole 91. As shown in FIG. 17(b), the mounting base 90 is slid diagonally upward and forward along the guide hole 91, thereby moving the radially inner end 90a of the mounting base 90, including the curved opposing surface 95, radially outward from the small diameter portion 81 of the holding base 80. In the state shown in FIG. 17(b), the base support shaft 102 is located at the end of the guide hole 91 closest to the axle 3.

[0070] Next, the operating lever 92 is lifted and the mounting base 90 is rotated upward around the base support shaft 102 as a fulcrum. Then, as shown in Figure 18(a), the operating lever 92 is once lifted above the holding hook 93, and then the mounting base 90 is slid along the guide hole 91 by pulling the operating lever 92 rearward as shown in Figure 18(b), and the operating lever 92 is hooked onto the holding hook 93.

[0071] By making the guide hole 91 an elongated hole in this way, the mounting base 90 can be translated along the longitudinal direction of the guide hole 91 and can also be rotated around the base spindle 102 as a fulcrum. In other words, the movement of the mounting base 90 between the brake position and the retracted position can be a combination of sliding and rotating movements. Note that this is also true if the guide hole 91 is not inclined as shown in Figure 20.

[0072] However, the movement of the mounting base 90 between the brake position and the retracted position may not involve a rotational movement, and may involve, for example, a translational movement in the vertical direction.

[0073] Although the disc brake device in the above embodiment is of a hydraulic type, it may be of a mechanical type. [Explanation of symbols]

[0074] 1. Danjiri float 2. Jiguram (dish) body 2a Platform 3 axles 4 wheels 4a through hole 4b Recess 5 Base 6 Main body 7 Vertical frame material 7a Upper groove 8 Horizontal frame material 9 Shaft support material 9a Lower groove 10 Wheel bearings 11 Bearing sleeve 12 Bearing flange 13 Fitting recess 14 Bearing sleeve 15 Bearing plate 16 volts 17 Nut 20 Stopper sleeve 21 Sliding washer 22 Wear-resistant materials 23 Outer washer 24 Thrust bearing 25 Inner washer 30 Brake rotor 30a Outer surface 31 Caliper 32 Caliper groove 33 Radial opposing surface 40 Brake pedal 41 Link 1 42 Second Link 43 Third Link 44 Front bracket 45 Front support shaft 46 Rear bracket 47 Rear support shaft 48 Cylinder bracket 49 Master cylinder 50 Reserve Hose 51 Supply hose 60 Base tube 61 Caliper base 62 Base tube 63 Wheel mounting flange 64 Rotor mounting flange 65 Bolt insertion hole 66 Fitting protrusion 67 Ball Bearings 68 Internal Restrictions 70 Inner step 71 Base Sleeve 72 Wheel mounting ring 73 Rotor mounting ring 74 Positioning step 80 holding base 81 Small diameter part (restriction part) 82 Large diameter section 83 Base body 84 Outer ring holder 90 Mounting base 90a Radial inner end 90b Radial outer end 91 Guide hole 92 Operating lever 93 Retaining Hook 94 Support rod 95 Curved opposing surface (contact part) 96 caliper bracket 100 Base Guide 101 Guide bracket 102 Base support shaft 103 Mounting plate 104 Support plate part 110 Center line 111 Longitudinal 200 ground 201 Drums θ Tilt angle

Claims

1. A brake system for a float in which an axle is detachably attached to a float body and a wheel is rotatably supported on the axle, Equipped with a disc brake device, The disc brake device A brake rotor that rotates integrally with the wheel; a caliper that applies a brake to the brake rotor; A braking system for the float.

2. The brake rotor and the wheel are provided so as to be movable within a predetermined range in the axial direction relative to the axle, 2. A trolley brake system according to claim 1, wherein the disc brake device comprises a follower mechanism for causing the caliper to follow the axial movement of the brake rotor.

3. The follow-up mechanism includes a base tube attached to the wheel and rotatably supported on the axle, and a caliper base rotatably supporting the base tube from the radially outer side and movable axially integrally with the base tube; The brake rotor is attached to the base cylinder.

3. A trolley brake system as claimed in claim 2, wherein the caliper is mounted on a caliper base.

4. 4. A paddock brake system according to claim 3, wherein the follower mechanism is attached to the paddock body and includes a base guide for guiding the axial movement of the caliper base.

5. The axle is configured to be detached from the carriage body with the wheels attached, A paddock brake system as described in claim 3 or 4, wherein the caliper base comprises a retaining base and an attachment base which can be connected and separated from each other, the retaining base is attached to the base tube so as to rotatably support the base tube from the radially outside, the attachment base is attached to the paddock body so as to be axially movably, and the caliper is attached to the attachment base.

6. The axle is configured to be detached from the carriage body with the wheels attached, The disc brake device includes a mounting base to which a caliper is attached, 2. A paddock brake system as described in claim 1, wherein the mounting base is attached to the paddock body so as to be movable between a braking position in which the caliper brakes the brake rotor and a retracted position in which the caliper is positioned radially outwardly relative to the brake rotor and does not interfere with removal of the axle.

7. The axle is configured to be removed downward from the carriage body, 7. A paddock brake system according to claim 6, wherein the mounting base is provided so as to be rotatable up and down about an axis parallel to the axle, and is rotatable upward from the braking position to the retracted position.

8. 8. A paddock brake system according to claim 6 or 7, wherein the disc brake device comprises a holding base attached to the axle, the mounting base being connectable and detachable to the holding base, and when the mounting base is connected to the holding base, the mounting base is held in the braking position, and when the mounting base is detached from the holding base, the mounting base is movable between the braking position and the retracted position.

9. 9. A paddock brake system according to claim 8, wherein the disc brake device is provided with a restricting portion that restricts movement of the mounting base toward the axle beyond the braking position of the mounting base within a predetermined range.

10. the mounting base is provided with an abutment portion that can abut against the regulating portion, and when the abutment portion abuts against the regulating portion, movement of the mounting base toward the axle beyond the brake position is restricted; A land vehicle brake system as described in claim 9, wherein when the abutment portion abuts against the regulating portion, a gap is secured between the outer peripheral surface of the brake rotor and the radially opposing surface of the caliper that faces radially outward from the outer peripheral surface of the brake rotor.

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