Dolly

Abstract

To provide a dolly that dispenses with an operation of kicking up a brake pedal and a release pedal from below.SOLUTION: A dolly 1 includes: a base portion 2; casters 3 provided on a lower side of the base portion 2; a brake member 7; a brake pedal 5; and a release pedal 6. When the brake pedal 5 is stepped downward, the brake member 7 is pressed against the casters 3 to bring about a braking state. When the release pedal 6 is stepped down, the brake member 7 is separated from the casters 3, and the braking state is released to bring about a released state. A front-rear direction and a right-left direction orthogonal to the front-rear direction are defined. In the braking state and the released state, a release tread surface 61, which is a tread surface of the release pedal 6, is located above a brake tread surface 51, which is a tread surface of the brake pedal 5. In the released state, a front-rear length 53 of a brake exposed tread surface 52 in plan view is longer than a front-rear length 65 of a released exposed tread surface 62.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to a dolly, and more particularly to a dolly having a base, casters, a brake pedal, and a release pedal. [Background technology]

[0002] Conventionally, a transport cart has been known (see, for example, Patent Document 1). This transport cart is configured with casters for running provided on the bottom surface at the four corners of the platform, and is equipped with a braking device for braking the casters. The braking device has an operating piece with an operating pedal on one end, a brake piece equipped with a brake shoe, and a cam mechanism that moves the brake piece back and forth in the braking direction or the braking release direction in conjunction with the movement of the operating piece. The braking device can brake or release the brake on the caster with a single operating pedal. The transport cart also has a spring that urges the brake piece in the braking release direction.

[0003] When the user of the transport cart depresses the operating pedal until it is in a substantially horizontal position, the operating piece tilts, the brake piece moves backward, and the brake shoe is pressed against the caster wheel, thereby braking the cart.

[0004] Next, when the operating pedal is released, the brake piece moves forward due to the return force of the spring, and the brake shoe moves away from the wheel, and as a result, the operating pedal returns from the approximately horizontal position to the obliquely upward position via the operating piece. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3814195 Summary of the Invention [Problem to be solved by the invention]

[0006] In the transport cart described in Patent Document 1, the operating pedal must be kept depressed to maintain the braking state, which restricts the user's movements and makes it difficult to use.

[0007] Therefore, Patent Document 1 describes that a locking device that locks and unlocks the braked state may be provided on the transport cart. If the locking device is provided on this transport cart, when the operation pedal is depressed, the cart is put into a braked state and the braked state is locked by the locking device, but to unlock and release the brake, it is necessary to kick up the operation pedal from below, making it difficult to perform the unlocking and braking operations.

[0008] The present invention was invented in consideration of the above-mentioned conventional problems, and aims to provide a trolley that is equipped with a brake pedal that is stepped on downward and a release pedal that is also stepped on downward, eliminating the need to kick up the pedals from below. [Means for solving the problem]

[0009] In order to solve the above problems, one embodiment of the present invention provides a bogie comprising a base, casters provided below the base, brake members, a brake pedal that, when stepped on downward, presses the brake members against the casters to establish a braking state, and a release pedal that, when stepped on downward, moves the brake members away from the casters to release the braking state and establish a released state. The bogie defines a front-to-rear direction and a left-to-right direction perpendicular to the front-to-rear direction. In the braking state and the released state, a release tread that serves as the tread surface of the release pedal is located higher than a brake tread that serves as the tread surface of the brake pedal. Portions of the brake tread and the release tread that protrude from the rear edge of the base serve as an exposed brake tread and an exposed release tread, respectively. In the released state, the front-to-rear length of the exposed brake tread in a plan view is longer than the front-to-rear length of the exposed release tread. In the braking state, the front-to-rear length of the exposed release tread in a plan view is longer than the front-to-rear length of the exposed brake tread. A recess recessed forward is formed in the left-right intermediate portion of the rear edge of the base. The brake pedal and the release pedal are located within the recess, protruding rearward from the rear edge of the base facing the recess, and do not protrude rearward from the rear edge of the base. The brake pedal is located rearward from the center in the front-rear direction of the caster against which the brake member is pressed. The brake member is located forward from the center in the front-rear direction of the caster against which the brake member is pressed. The caster against which the brake member is pressed is arranged so as not to be located outside the base in a plan view. Another form of bogie according to the present invention is a bogie comprising a base, casters provided on the underside of the base, a brake member, a brake pedal that, when stepped downward, presses the brake member against the caster to enter a braked state, a release pedal that, when stepped downward, moves the brake member away from the caster, thereby releasing the braked state and entering a released state, a brake pedal shaft that serves as the center of rotation of the brake pedal and supports the brake pedal so that it can rotate freely relative to the base, a release pedal shaft that serves as the center of rotation of the release pedal and supports the release pedal so that it can rotate freely relative to the base, a first link member, a first link shaft that serves as the center of rotation of the first link member and supports the first link member so that it can rotate freely relative to the base, a second link member rotatably connected to the first link member, a second link shaft that serves as the center of rotation of the second link member and supports the second link member so that it can rotate freely relative to the brake pedal, and a spring member that connects the second link shaft to the release pedal. In the braking state and the released state, a release tread surface that serves as the tread surface of the release pedal is located above a brake tread surface that serves as the tread surface of the brake pedal. The release pedal has a pressing portion that presses the brake pedal when the release tread surface is pressed in the braking state. [Effects of the Invention]

[0010] In the bogie according to the present invention, there is no need to perform the operation of kicking up the brake pedal and release pedal from below. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view of a truck according to a first embodiment, seen from diagonally above and behind. [Figure 2] Fig. 2A is a perspective view of the same truck as seen from diagonally below the rear, and Fig. 2B is an enlarged plan view of a part of the rear end portion of the truck with some members omitted. [Figure 3] FIG. 3 is a perspective view of the brake mechanism of the above-mentioned truck in a released state, with some components omitted, as seen from diagonally below the front. [Figure 4] FIG. 4 is a perspective view of the brake mechanism of the above-mentioned truck in a braking state, with some components omitted, as seen from diagonally below the front. [Figure 5] FIG. 5 is a side cross-sectional view of the brake mechanism. [Figure 6] FIG. 6 is a partially enlarged plan view of the periphery of the brake mechanism of the above-mentioned bogie in a braking state. [Figure 7] FIG. 7 is a partially enlarged plan view of the periphery of the brake mechanism of the above-mentioned bogie in a released state. DETAILED DESCRIPTION OF THE INVENTION

[0012] FIELD OF THE INVENTION The present invention relates to a bogie. DETAILED DESCRIPTION OF THE INVENTION A bogie according to the present invention will now be described with reference to the accompanying drawings.

[0013] A dolly according to a first embodiment will be described with reference to FIGS. 1 to 7. As shown in FIGS. 1 and 2A, the dolly 1 includes a base 2, casters 3, and a brake mechanism 10. A load is placed on the top surface of the base 2. The base 2 has a rectangular shape in a plan view. In this embodiment, the base 2 has a rectangular shape in a plan view and is integrally formed from resin. The front, back, left, and right of the dolly 1 are determined by design, with one side along the long side being the front and the other being the rear. Furthermore, one side along the short side (the left side when looking forward from the rear) being the left and the other being the right. In this embodiment, the shape of the dolly 1 in a plan view is symmetrical (i.e., bilaterally symmetrical) with respect to a line along the long side that passes through the center of the short side.

[0014] The base 2 has a peripheral rib 21 that protrudes downward from the outer periphery of its underside. The peripheral rib 21 is continuous and uninterrupted around the entire outer periphery of the underside of the base 2. The base 2 also has reinforcing ribs 22 on the inside surrounded by the peripheral rib 21 on the underside. The reinforcing rib 22 is mainly composed of lattice-shaped ribs, but there are also portions that do not form a lattice. The ends of the reinforcing ribs 22 are continuous with the peripheral rib 21, and the peripheral rib 21 and the reinforcing rib 22 are formed integrally. A rectangular recess 20 surrounded by the reinforcing rib 22 or the reinforcing rib 22 and the peripheral rib 21 is formed on the underside of the base 2.

[0015] The base 2 is also provided with a handle 11. The handle 11 is attached to the rear end of the base 2 via an attachment member 12. The attachment member 12 is attached to both left and right ends of the rear end of the underside of the base 2. The handle 11 is in an inverted U-shape, and both ends are attached to attachment members 12 located at both left and right ends of the base 2. The handle 11 is rotatably attached to the attachment member 12, and can be switched between a use state in which the handle 11 stands vertically relative to the top surface of the base 2 as shown in Figures 1 and 2A, and a storage state in which the handle 11 lies flat against the top surface of the base 2 (not shown).

[0016] The casters 3 are provided on the underside of the base 2. In this embodiment, the casters 3 are provided at the four corners of the base 2, which is rectangular in plan view. The casters 3 have a rotating shaft, a rim, a tire, etc. The tire is preferably made of rubber, but is not particularly limited thereto.

[0017] The rear casters 3 are attached to the left and right ends of the rear end of the underside of the base 2 via support members 30. The support members 30 have an attachment portion 31 and a support portion 32. The attachment portion 31 has a generally rectangular plate shape in a plan view. The attachment portion 31 is indirectly supported by the casters 3 via the support portion 32 and a rotation shaft. The attachment portion 31 is attached to the underside of the base 2. The shape of the attachment portion 31 is not particularly limited.

[0018] The support parts 32 are plate-shaped, roughly inverted triangular in side view, hanging down from the left and right edges of the mounting part 31. The rotation axis of the caster 3 is provided between the support parts 32, and the caster 3 is provided so as to be rotatable about the rotation axis. The rotation axis and rim of the caster 3, the mounting part 31, and the support parts 32 are made of metal.

[0019] The front casters 3 are provided on both the left and right ends of the front end of the underside of the base 2. Although not shown, the front casters 3 have a base attached to the underside of the base 2 and a rotation support connected to the base so as to be rotatable about an axis in the vertical direction relative to the base, and the rotation shaft of the front caster 3 is attached to the rotation support. Because the rotation support is rotatable relative to the base, the orientation of the rotation shaft of the caster 3 can be changed, and the traveling direction of the caster 3 can be changed.

[0020] 3 to 5, the brake mechanism 10 includes a brake unit 4, a brake pedal 5, and a release pedal 6. When the brake pedal 5 is depressed downward, the brake unit 4 brings the brake member 7 into contact with the caster 3 to establish a braked state, and when the release pedal 6 is depressed downward, the brake member 7 is separated from the caster 3 to release the braked state and establish a released state.

[0021] The brake section 4 includes a main shaft 40, a brake lever 50, a brake pedal shaft 41, a release lever 60, a release pedal shaft 42, a first link member 43, a first link shaft 44, a second link member 45, a second link shaft 46, a first biasing member 47, and a second biasing member 48.

[0022] The main shaft 40 is attached to the base 2. In this embodiment, main shaft holding members 23 are attached to both left and right ends of the rear end of the underside of the base 2, and the main shaft 40 is installed across the main shaft holding members 23. A pedal holding member 24 is attached to the center of the rear end of the underside of the base 2 in the left-right direction. The pedal holding member 24 includes an attachment piece 241 attached to the underside of the base 2 and hanging pieces 242 hanging from both left and right ends of the attachment piece 241. Note that the left hanging piece 242 is omitted in Figures 3 and 4. Figure 2B shows an enlarged plan view of the rear end of the bogie 1, omitting components such as the handle 11 and the attachment member 12. As shown in Figure 2B, a recess 26 recessed forward is formed in the middle of the rear edge 25 of the base 2 in the left-right direction. The brake pedal 5 and the release pedal 6 are located within this recess 26 and do not protrude rearward beyond the rear edge 25 of the base 2.

[0023] As shown in Figures 3 to 5, the brake lever 50 is provided between the left and right hanging pieces 242. The brake pedal shaft 41 serves as the center of rotation of the brake pedal 5 and supports the brake pedal 5 so as to be rotatable relative to the base 2. The brake pedal shaft 41 is installed across the left and right hanging pieces 242 and is indirectly attached to the base 2, but it may also be directly attached to the base 2. The brake pedal shaft 41 is inserted into the brake lever 50, and the brake lever 50 is supported so as to be rotatable relative to the brake pedal shaft 41. The brake pedal 5 is formed at the rear end of the brake lever 50. The upper surface of the brake pedal 5 forms the brake tread surface 51. In this embodiment, the brake pedal 5 has a rectangular plate shape in a plan view and is slightly bent downwardly in the center in the front-to-rear direction.

[0024] The release lever 60 is provided between the left and right hanging pieces 242 and above the brake lever 50. The release pedal shaft 42 serves as the center of rotation of the release pedal 6 and supports the release pedal 6 so that it can rotate freely relative to the base 2. The release pedal shaft 42 is installed above the brake pedal shaft 41 across the left and right hanging pieces 242 and is indirectly attached to the base 2, but it may also be directly attached to the base 2. The release pedal shaft 42 is inserted into the release lever 60, and the release lever 60 is supported so that it can rotate freely relative to the release pedal shaft 42. The release pedal 6 is formed at the rear end of the release lever 60. The upper surface of the release pedal 6 forms a release tread surface 61. In this embodiment, the release pedal 6 has a rectangular plate shape in a plan view and is slightly bent downward at the center in the front-to-rear direction. Furthermore, a pressing portion 64 that presses the brake lever 50 from above is formed on the underside of the release lever 60, forward of the release pedal shaft 42.

[0025] The first link member 43 is connected to the main shaft 40. The main shaft 40 serves as the center of rotation of the first link member 43 and supports the first link member 43 so that it can rotate freely relative to the base 2. Specifically, the main shaft 40 is fitted into one end of the first link member 43, and the first link member 43 rotates integrally with the main shaft 40, with the main shaft 40 serving as the center of rotation.

[0026] A first link shaft 44 is inserted into the other end of the first link member 43. The first link shaft 44 is inserted into one end of the second link member 45. The first link shaft 44 is inserted into the first link member 43 and the second link member 45, respectively, and connects the first link member 43 and the second link member 45 so that the first link member 43 and the second link member 45 are rotatable relative to each other.

[0027] A second link shaft 46 is inserted into the other end of the second link member 45. The second link shaft 46 serves as the center of rotation of the second link member 45 and supports the second link member 45 so that it can rotate freely with respect to the brake pedal 5. The second link shaft 46 is also inserted into the brake lever 50. The second link shaft 46 is inserted into a portion of the brake lever 50 that is forward of the portion through which the brake pedal shaft 41 is inserted. As a result, the second link member 45 and the brake lever 50 are rotatably connected to each other via the second link shaft 46.

[0028] A first biasing member 47 (see FIG. 4) is installed between the brake pedal shaft 41 and the first link shaft 44. The first biasing member 47 biases the brake pedal shaft 41 and the first link shaft 44 in a direction that brings them closer together. As a result, when the second link shaft 46 is located below the line connecting the brake pedal shaft 41 and the first link shaft 44 as shown in FIG. 3, the first biasing member 47 biases the brake pedal shaft 41 and the first link shaft 44 in a direction that brings them closer together, thereby generating a biasing force that rotates the brake lever 50 in a direction that moves the brake pedal 5 upward. Note that FIG. 3 shows a case where the brake pedal 5 is located at the upper limit of its movement range, and the line connecting the center of the brake pedal shaft 41 and the center of the brake pedal 5 in the front-to-rear direction is horizontal or nearly horizontal (within a 20-degree error from horizontal).

[0029] 4, when the second link shaft 46 is located above the line connecting the brake pedal shaft 41 and the first link shaft 44, the first biasing member 47 biases the brake pedal shaft 41 and the first link shaft 44 in a direction that brings them closer together, resulting in the generation of a biasing force that rotates the brake lever 50 in a direction that moves the brake pedal 5 downward. Note that FIG. 4 shows a case where the brake pedal 5 is located at the lower limit of its movement range. In this case, the brake lever 50 comes into contact with the release lever 60, and movement of the brake lever 50 (downward movement of the brake pedal 5) is restricted.

[0030] A second biasing member 48 is installed between the portion of the release lever 60 forward of the release pedal shaft 42 and the second link shaft 46. The second biasing member 48 biases the portion of the release lever 60 forward of the release pedal shaft 42 in a direction in which the portion and the second link shaft 46 move closer together. The second biasing member 48 biases the portion of the release lever 60 forward of the release pedal shaft 42 in a direction in which the portion moves downward, i.e., in a direction in which the release pedal 6 moves upward. Note that FIG. 3 shows the case in which the release pedal 6 is located at the upper limit of its movement range.

[0031] A brake member 7 is attached to the main shaft 40. Specifically, a brake member holding portion 70 is attached to the main shaft 40, and the brake member 7 is attached to the tip of the brake member holding portion 70. In this embodiment, the brake member 7 is a brake shoe, which comes into contact with the surface of the caster 3 and is pressed against the caster 3, or moves away from the surface of the caster 3 as the main shaft 40 rotates.

[0032] The operation of the brake mechanism 10 will now be described.

[0033] In the released state shown in FIG. 3 , the brake member 7 is not in contact with the caster 3, and the brake lever 50 is horizontal. When the brake tread 51 is depressed downward in this state, the brake lever 50 rotates about the brake pedal shaft 41, and the second link member 45 also rotates relative to the brake lever 50 via the second link shaft 46. When the brake lever 50 rotates and the second link shaft 46 moves above the line connecting the first link shaft 44 and the brake pedal shaft 41, the biasing force of the first biasing member 47 moves the brake pedal 5 to the lower limit of its range of movement, even if the brake pedal 5 is released, resulting in the brake state shown in FIG. 4 , and the rotation of the brake lever 50 stops. The rotation of the brake lever 50 rotates the second link member 45, and the rotation of the second link member 45 rotates the first link member 43 and the main shaft 40. In the braked state, the rotation of the main shaft 40 presses the brake member 7 against the surface of the caster 3, braking the caster 3.

[0034] Furthermore, when the brake state is engaged, the second link shaft 46 moves upward, so the second biasing member 48 and the portion of the release lever 60 rearward of the release pedal shaft 42 to which the second biasing member 48 is attached move upward, and the release pedal 6 forward of the release pedal shaft 42 of the release lever 60 moves downward. The line connecting the center of the release pedal shaft 42 and the center of the release pedal 6 in the front-to-rear direction is horizontal or nearly horizontal (within a 20-degree error from the horizontal).

[0035] Next, when the release tread 61 is pressed downward in the braking state, the release lever 60 rotates downward about the release pedal shaft 42, and the pressing portion 64 presses downward the portion of the top surface of the brake lever 50 forward of the brake pedal shaft 41. The portion of the brake lever 50 pressed by the pressing portion 64 moves downward, and the brake pedal 5 moves upward. When the second link shaft 46 moves below the line connecting the first link shaft 44 and the brake pedal shaft 41, the biasing force of the first biasing member 47 moves the brake pedal 5 to the upper limit of its movement range, even if the release pedal 6 is stopped, and the release state shown in FIG. 3 is reached, and the rotation of the brake lever 50 stops.

[0036] As the brake lever 50 rotates, the second link member 45 rotates, and as the second link member 45 rotates, the first link member 43 and the main shaft 40 rotate, causing the brake member 7 to move away from the surface of the caster 3, and the brake on the caster 3 is released.

[0037] Furthermore, when the release state is set, the second link shaft 46 moves downward, causing the second biasing member 48 and the portion of the release lever 60 in front of the release pedal shaft 42 to which the second biasing member 48 is attached to move downward, and furthermore, the biasing force of the second biasing member 48 causes the release pedal 6 behind the release pedal shaft 42 of the release lever 60 to move upward.

[0038] Next, the positional relationship between the brake tread surface 51 and the release tread surface 61 in the released state and the brake state will be described.

[0039] As shown in FIGS. 3 and 4, the release tread 61 is located above the brake tread 51 in the brake and release states.

[0040] 6 and 7, at least a portion of the brake pedal 5 and the release pedal 6 are located at the same position in the left-right direction. In this embodiment, the release tread 61 is included in the brake tread 51 in the left-right direction. In other words, the width (length in the left-right direction) of the brake tread 51 is longer than the width of the release tread 61, and the release tread 61 is located within the width of the brake tread 51.

[0041] In this embodiment, since the brake pedal 5 is stepped on downward and the release pedal 6 is also stepped on downward, there is no need to kick the pedal up from below to release the brake. Also, the arrangement area of ​​the brake pedal 5 and the release pedal 6 in the left-right direction can be small.

[0042] The portion of the brake tread 51 that protrudes rearward from the rear edge of the base 2 is the exposed brake tread 52, and the portion of the release tread 61 that protrudes rearward from the rear edge of the base 2 is the exposed release tread 62. In other words, the exposed brake tread 52 is the portion of the brake tread 51 that is exposed rearward from the rear edge of the base 2 in a plan view, and the exposed release tread 62 is the portion of the release tread 61 that is exposed rearward from the rear edge of the base 2 in a plan view.

[0043] As shown in Figure 6, in the released state (see Figure 3), the front-to-rear length 53 of the exposed brake tread 52 is longer than the front-to-rear length 65 of the exposed release tread 62. Note that the front-to-rear length 53 and the front-to-rear length 65 here refer to the front-to-rear lengths of the exposed brake tread 52 and the exposed release tread 62, respectively, in a plan view. In this way, in the released state, the exposed brake tread 52 is easier to step on because the front-to-rear length 53 of the exposed brake tread 52 is longer than the front-to-rear length 65 of the exposed release tread 62.

[0044] Furthermore, in the released state, the surface direction of the brake tread 51 is closer to horizontal than the surface direction of the release tread 61. This makes it easier to make the front-to-rear length 53 of the exposed brake tread 52 longer than the front-to-rear length 65 of the exposed release tread 62 in the released state. Furthermore, in the released state, it is easier to step on the exposed brake tread 52.

[0045] 7, in the braking state (see FIG. 4), the front-to-rear length 65 of the exposed release tread 62 is longer than the front-to-rear length 53 of the exposed brake tread 52. In this way, in the braking state, the exposed release tread 62 is easier to step on because the front-to-rear length 65 of the exposed release tread 62 is longer than the front-to-rear length 53 of the exposed brake tread 52.

[0046] Furthermore, in the braking state, the surface direction of the release tread 61 is closer to horizontal than the surface direction of the brake tread 51. This makes it easier to make the front-to-rear length 65 of the exposed release tread 62 longer than the front-to-rear length 53 of the exposed brake tread 52 in the braking state. Also, in the braking state, it is easier to step on the exposed release tread 62.

[0047] Next, a modified example will be described.

[0048] The shape of the base 2 may be square in plan view, or may not be rectangular in plan view, and is not particularly limited. Furthermore, the shapes of the base 2 and the carriage 1 do not have to be symmetrical left to right or front to back. The size of the base 2 is not particularly limited.

[0049] The base 2 may be entirely made of resin, or the main part of the base 2 may be made of resin and the remaining part may be made of a material other than resin. Also, the entire base 2 may be made of a material other than resin, such as metal.

[0050] The entire base 2 does not have to be formed as a single unit. For example, the base 2 may be formed by combining a plurality of side members and corner members that connect the plurality of side members.

[0051] The direction of the rotation axis of the front caster 3 may be fixed, and the direction of the rotation axis of the rear caster 3 may be changeable. The positions at which the casters 3 are provided on the base 2 and the number of casters 3 provided are not limited.

[0052] The handle 11 does not have to be provided so as to be switchable between a usage state in which it stands up relative to the base 2 and a storage state in which it lies flat along the top surface of the base 2. In addition, the handle 11 does not have to be provided on the dolly 1.

[0053] The front casters 3 and the rear casters 3 are not limited to those described above, and various known casters can be used as appropriate.

[0054] The brake member 7 may be inserted into an opening or recess of the caster 3 from the side of the caster 3 to restrict the rotation of the caster 3.

[0055] There is no particular limitation on the shape of the brake pedal 5. In addition, the brake pedal 5 may be manufactured separately from the brake lever 50 and then attached to the brake lever 50, or may be manufactured integrally with the brake lever 50.

[0056] There is no particular limitation on the shape of the release pedal 6. Furthermore, the release pedal 6 may be manufactured separately from the release lever 60 and then attached to the release lever 60, or may be manufactured integrally with the release lever 60.

[0057] The brake tread 51 and the release tread 61 may be arranged at different positions in the left-right direction so as not to be located at the same position in the left-right direction.

[0058] As is clear from the above-described embodiments and modifications, the trolley 1 of the first aspect includes a base 2, casters 3 provided on the underside of the base 2, braking members 7, a brake pedal 5, and a release pedal 6. When the brake pedal 5 is stepped down, it presses the braking members 7 against the casters 3 to enter a braking state. When the release pedal 6 is stepped down, it separates the braking members 7 from the casters 3 to release the braking state and enter a released state. In the braking state and the released state, the release tread surface 61, which is the tread surface of the release pedal 6, is located above the brake tread surface 51, which is the tread surface of the brake pedal 5.

[0059] According to the first aspect, since the brake pedal 5 that is stepped on downward and the release pedal 6 that is also stepped on downward are provided, there is no need to kick the pedal up from below to release the brake.

[0060] The second aspect can be realized by combining the first aspect with the brake tread surface 51. In the second aspect, at least a portion of the brake tread surface 51 and the release tread surface 61 are located at the same position in the left-right direction.

[0061] According to the second aspect, the arrangement area of ​​the brake pedal 5 and the release pedal 6 in the left-right direction can be made small.

[0062] The third aspect can be realized by combining the first or second aspect. In the third aspect, the front-to-rear direction is defined, and the portions of the brake tread 51 and the release tread 61 that protrude beyond the rear edge of the base 2 become the exposed brake tread 52 and the exposed release tread 62, respectively. In the released state, the front-to-rear length 53 of the exposed brake tread 52 is longer than the front-to-rear length 65 of the exposed release tread 62. In the braking state, the front-to-rear length 65 of the exposed release tread 62 is longer than the front-to-rear length 53 of the exposed brake tread 52.

[0063] According to the third aspect, in the released state, the front-to-rear length 53 of the brake exposed tread 52 is longer than the front-to-rear length 65 of the release exposed tread 62, making it easier to step on the brake exposed tread 52, and in the brake state, the front-to-rear length 65 of the release exposed tread 62 is longer than the front-to-rear length 53 of the brake exposed tread 52, making it easier to step on the release exposed tread 62.

[0064] The fourth aspect can be realized by combining any one of the first to third aspects. In the fourth aspect, in the released state, the surface direction of the brake tread surface 51 is closer to horizontal than the surface direction of the release tread surface 61. In the braking state, the surface direction of the release tread surface 61 is closer to horizontal than the surface direction of the brake tread surface 51.

[0065] According to the fourth aspect, in the released state, the front-to-rear length 53 of the exposed brake tread 52 is easily made longer than the front-to-rear length 65 of the exposed release tread 62, making it easier to step on the exposed brake tread 52. Also, in the braking state, the front-to-rear length 65 of the exposed release tread 62 is easily made longer than the front-to-rear length 53 of the exposed brake tread 52, making it easier to step on the exposed release tread 62.

[0066] A fifth aspect can be realized by combining any one of the first to fourth aspects. In the fifth aspect, the bogie 1 includes a brake pedal shaft 41, a release pedal shaft 42, a first link member 43, a first link shaft 44, a second link member 45, a second link shaft 46, and a spring member. The brake pedal shaft 41 serves as a rotation center of the brake pedal 5 and supports the brake pedal 5 so as to be rotatable relative to the base 2. The release pedal shaft 42 serves as a rotation center of the release pedal 6 and supports the release pedal 6 so as to be rotatable relative to the base 2. The first link shaft 44 serves as a rotation center of the first link member 43 and supports the first link member 43 so as to be rotatable relative to the base 2. The second link member 45 is rotatably connected to the first link member 43. The second link shaft 46 serves as a rotation center of the second link member and supports the second link member so as to be rotatable relative to the brake pedal 5. The spring member connects the second link shaft 46 and the release pedal 6. The release pedal 6 has a pushing portion 64 that pushes the brake pedal 5 when the release tread surface 61 is stepped on in the braking state.

[0067] According to the fifth aspect, the braking state can be maintained even if the brake pedal 5 is not depressed. [Explanation of symbols]

[0068] 1 cart 10 Brake mechanism 11 handle 12 Mounting parts 2 base 20 recess 21 Peripheral rib 22 Reinforcing rib 23 Spindle holding member 24 Pedal holding member 241 Mounting piece 242 Hanging piece 25 Back edge 26 Recess 3 Casters 30 Support member 31 Mounting part 32 Support part 4 Brake section 40 spindle 41 Brake pedal shaft 42 Release pedal shaft 43 First link member 44 First link shaft 45 Second link member 46 Second link shaft 47 First biasing member 48 second biasing member 5. Brake pedal 50 brake lever 51 Brake tread 52 Exposed brake tread 53 Front and rear length 6 Release pedal 60 Release lever 61 Release tread 62 Release exposure tread 64 Pushing part 65 front and rear length 7 Brake member 70 Brake member holding portion

Claims

1. A base and Casters provided on the underside of the base; A brake member; a brake pedal that, when stepped downward, presses the brake member against the caster to bring the caster into a braking state; a release pedal that, when stepped on downward, moves the brake member away from the caster to release the brake state and set the cart in a released state, A front-to-back direction and a left-to-right direction perpendicular to the front-to-back direction are defined, In the braking state and the released state, a release tread surface that is the tread surface of the release pedal is located higher than a brake tread surface that is the tread surface of the brake pedal, The brake tread and the release tread are formed such that portions thereof protruding from the rear end edge of the base portion are an exposed brake tread and an exposed release tread, respectively; In the released state, the front-to-rear length of the brake exposed tread surface in a plan view is longer than the front-to-rear length of the release exposed tread surface, In the braking state, the front-to-rear length of the release exposed tread in a plan view is longer than the front-to-rear length of the brake exposed tread, a recess recessed forward is formed in a middle portion of the rear end edge of the base in the left-right direction, the brake pedal and the release pedal are positioned within the recessed portion, protruding rearward from a rear end edge of the base portion that faces the recessed portion, and do not protrude rearward from the rear end edge of the base portion, The brake pedal is located rearward of a center in the front-rear direction of the caster against which the brake member is pressed, The brake member is located forward of a center in the front-rear direction of the caster against which the brake member is pressed, The caster against which the brake member is pressed is provided so as not to be located outside the base portion in a plan view. A bogie characterized by:

2. A base and Casters provided on the underside of the base; A brake member; a brake pedal that, when stepped downward, presses the brake member against the caster to bring the caster into a braking state; a release pedal that, when stepped downward, separates the brake member from the caster to release the brake state and set the brake to a released state; a brake pedal shaft that serves as a rotation center of the brake pedal and supports the brake pedal so as to be rotatable relative to the base; a release pedal shaft that serves as a rotation center of the release pedal and supports the release pedal so that the release pedal is rotatable relative to the base; A first link member; a first link shaft that serves as a rotation center of the first link member and supports the first link member so as to be rotatable relative to the base portion; a second link member rotatably connected to the first link member; a second link shaft that serves as a rotation center of the second link member and supports the second link member so as to be rotatable relative to the brake pedal; a spring member connecting the second link shaft and the release pedal, In the braking state and the released state, a release tread surface that is the tread surface of the release pedal is located higher than a brake tread surface that is the tread surface of the brake pedal, The release pedal has a pressing portion that presses the brake pedal when the release pedal is pressed on the release tread surface in the braking state. A bogie characterized by:

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