JP2022048537A - Brake mechanism of free roller - Google Patents

Abstract

To provide a brake mechanism of a free roller which can surely lock a wheel, and prevents damage of the wheel.SOLUTION: A brake mechanism of a free roller has a foundation part fixed to a mounting object, a support part that is provided on a lower side of the foundation part and is rotatable around a vertical axis, and a wheel that is provided on the support part is rotatable around a horizontal axis eccentric to a rotation axis of the support part, and includes a brake shoe that is positioned on the rotation axis of the support part and is vertically movable, and an operation mechanism for vertically moving the brake shoe, in which the brake shoe has a friction surface that is axially symmetric to the rotation axis of the support part and is inclined downward toward the axial side from an outer peripheral side, the frictions surface is separated from the wheel at an upper position, and the frictions surface is brought into contact with the wheel from an upper side at a lower position.SELECTED DRAWING: Figure 2

Description

The present invention relates to a brake mechanism of a universal caster used for a trolley or the like.

Conventionally, there are universal casters in which the wheels can rotate around a vertical axis and the traveling direction can be changed. When this universal caster is used for a dolly, it is easy to change direction and it is easy to use even in a narrow place. However, if an earthquake occurs while using this dolly, the dolly may run away in an unexpected direction due to vibration, which poses a great danger depending on the type of goods placed on the dolly. For example, it is conceivable that a dolly with a heater may run away and cause a fire. Therefore, in order to prevent such a runaway, a brake mechanism capable of switching the wheel state between a rotatable free state and a non-rotating locked state is used in the universal caster, for example, the one shown in Patent Document 1. be.

Japanese Unexamined Patent Publication No. 2019-123487

However, in the brake mechanism of Patent Document 1, since the flat plate-shaped lock portion protruding downward contacts the wheel from above, the wheel is moved in a locked state (a state in which the lock portion is in contact with the wheel). In such a case, the lock portion may bite into the surface of the wheel and damage the wheel.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a brake mechanism for universal casters, which can securely lock a wheel and does not damage the wheel.

In the present invention, the foundation portion fixed to the mounting target, the support portion provided on the lower side of the foundation portion and rotatable around the vertical axis, and the eccentricity of the support portion provided on the support portion with respect to the rotation axis of the support portion. It is a brake mechanism of a universal caster that has wheels that can rotate around the horizontal axis, and is equipped with a brake shoe that is located on the rotation axis of the support and can move up and down, and an operation mechanism that moves the brake shoe up and down. The shoe has a friction surface that is axially symmetric with respect to the rotation axis of the support portion and inclines downward from the outer peripheral side toward the shaft side. It is characterized in that the friction surface abuts on the wheel from above when it is located on the lower side.

According to the present invention, since the brake shoe moves up and down on the rotation axis of the support portion and has a friction surface axially symmetric with respect to the rotation axis of the support portion, the wheel is around the vertical axis. Regardless of the direction in which the brake shoes are facing, the friction surface of the brake shoes abuts on the wheels in the same state, so the wheels can be securely locked. Since the friction surface inclines downward from the outer peripheral side toward the shaft side, the brake shoe abuts on the surface of the wheel in the locked state, so that the wheel is moved while the wheel is locked. Even if this happens, the brake shoes will not bite into the wheels and will not damage the wheels.

The free casters and the brake mechanism (free state) attached to the bogie are shown, (a) is a front view, and (b) is a bottom view. FIG. 1A is a cross-sectional view of an enlarged central axis (rotational axis of a support portion) of a brake shoe portion in FIG. 1 (a). It is a front view of a universal caster and a brake mechanism (locked state) attached to a bogie. FIG. 3 is a cross-sectional view of an enlarged central axis (rotational axis of the support portion) of the brake shoe portion in FIG. The whole of the dolly is shown, (a) is a bottom view, and (b) is a side view.

Hereinafter, the specific contents of the brake mechanism of the universal caster of the present invention will be described. In the embodiment shown here, as shown in FIG. 5, the universal casters 1 are attached to the four corners of the lower surface of the rectangular flat plate-shaped carriage main body 101 to form the carriage 100. The details of the dolly 100 will be described later. In the following description of the universal caster 1 and the brake mechanism, the left and right sides indicate the left and right sides in FIG. 1A, the front side indicates the front side in FIG. 1A, and the rear side indicates the back side in FIG. 1A. .. Further, the movable member will be described based on the illustrated state.

As shown in FIGS. 1 and 2, the universal caster 1 has a flat plate-shaped foundation portion 11 fixed to the bogie main body 101 to be mounted, a support portion 12 provided on the lower side of the foundation portion 11, and a support portion. It has a wheel 13 provided on the twelve. The base portion 11 has a substantially square flat plate shape, and four corner portions are bolted to the lower surface of the carriage body 101. A hole 111 that penetrates vertically is formed in the center of the foundation portion 11, and an annular groove portion 112 that opens downward is formed around the hole 111. The support portion 12 has a substantially disk-shaped upper piece 121 and a substantially triangular hanging piece 122 extending downward from the front and rear edges of the upper piece 121. A hole 123 penetrating vertically is formed in the center of the upper piece 121, and an annular groove portion 124 opening upward is formed around the hole 123. The left side of the hanging piece 122 is vertically oriented, the right side is inclined from the upper right to the lower left, and the lower end thereof is displaced to the left with respect to the rotation axis X of the support portion 12. The hole 111 of the foundation portion 11 and the hole 123 of the upper piece 121 of the support portion 12 correspond to each other in the vertical direction, and a support portion shaft 113 penetrating both the holes 111 and 123 is provided. The upper and lower ends of the support shaft 113 are formed in a brim shape to prevent them from coming off. Further, the groove portion 112 of the foundation portion 11 and the groove portion 124 of the upper piece 121 of the support portion 12 face each other vertically, and a plurality of steel balls 114 are housed between both the groove portions 112 and 124 to form a ball bearing structure. Is formed. As a result, the support portion 12 is rotatable around the vertical axis, and even when a force is applied in the direction of pressing the support portion 12 against the base portion 11, the support portion 12 rotates smoothly. Further, a wheel 13 is provided at the lower end portion of the support portion 12. The wheel 13 has both an outer peripheral side portion corresponding to the tire and an inner peripheral side portion corresponding to the wheel made of resin, and is laid horizontally between the lower end portions of both the front and rear hanging pieces 122 of the support portion 12. It is pivotally supported by a wheel shaft 131. As a result, the wheel 13 is rotatable around the horizontal axis. Since the lower end of the hanging piece 122 is displaced to the left with respect to the rotation axis X of the support portion 12, the wheel shaft 131 is eccentric (shifted in the horizontal direction) with respect to the rotation axis X of the support portion 12. The right end of the wheel 13 and the left and right positions of the rotation axis X of the support portion 12 are substantially the same.

The brake mechanism provided on the universal caster 1 includes a brake shoe 2 that abuts on the wheel 13 and locks the wheel 13, and an operation mechanism 3 that moves the brake shoe 2. The brake shoe 2 includes a substantially disk-shaped main body 21 and a shaft portion 22 that penetrates the center of the main body 21 and projects upward. The central axis of the main body 21 coincides with the rotation axis X of the support portion 12, and the lower surface of the main body 21 is axisymmetric with respect to the rotation axis X of the support portion 12 and is inclined downward from the outer peripheral side toward the shaft side. It is a friction surface 23. As shown in FIG. 2, the friction surface 23 has a steeper slope as it approaches the shaft side, and has a curved line in which the generatrix becomes concave toward the lower side, and is a circle located below the friction surface 23. The shape is substantially the same as the outer peripheral surface of the wheel 13. That is, the gradient of the generatrix of the friction surface 23 substantially coincides with the circumferential direction of the circular wheel 13 located below the bus. Further, a plurality of concentric grooves 24 are formed on the friction surface 23. A hole 115 that penetrates vertically is formed in the support portion shaft 113 that connects the base portion 11 and the support portion 12 of the universal caster 1, and the shaft portion 22 of the brake shoe 2 is formed from below in this hole 115. It is inserted and the tip of the shaft portion 22 projects upward from the foundation portion 11. At the tip of the shaft portion 22, a flange portion 25 extending to the outer peripheral side is formed. An annular washer member 26 is fixed to the lower side of the support shaft 113. The washer member 26 penetrates the shaft portion 22 of the brake shoe 2, and the inner edge portion of the washer member 26 projects toward the inner peripheral side of the hole 115 of the support portion shaft 113. A compression coil spring 27 is provided on the outer peripheral portion of the shaft portion 22 of the brake shoe 2. The compression coil spring 27 is inserted into the hole 115 of the support shaft 113 together with the shaft portion 22, the upper end portion is in contact with the flange portion 25, the lower end portion is in contact with the washer member 26, and the brake shoe 2 is a compression coil spring. It is in a state of being urged to the upper side by 27. The brake shoe 2 configured in this way is located on the rotation axis X of the support portion 12 and can move up and down, and is located on the upper side due to the urging force of the compression coil spring 27 in a state where no external force acts. It is in a state (a state in which the upper surface of the main body 21 is in contact with the lower surface of the washer member 26).

The operation mechanism 3 is a mechanism for moving the brake shoe 2 up and down, and includes an arm 4 provided on the upper side of the base portion 11 of the free caster 1 and a bell crank 5 provided on the right side of the free caster 1. A fixture 41 made of a leaf spring material that is U-shaped and opens to the right is attached to the upper left end of the foundation portion 11, and the lower surface of the fixture 41 is fixed to the foundation portion 11. ing. Then, the left end portion of the arm 4 extending to the left and right is fixed to the upper surface of the fixture 41. The arm 4 has a U-shaped cross section and is made of a profile that opens downward, is approximately twice the left-right width of the base portion 11, and is located above the upper end of the shaft portion 22 of the brake shoe 2. However, in the range located on the upper side of the base portion 11 of the arm 4, the lower side portion is cut out to reduce the vertical width. When no external force is applied, the arm 4 and the shaft portion 22 of the brake shoe 2 do not come into contact with each other. A rectangular recess 102 is formed at a position corresponding to the arm 4 on the lower surface of the carriage body 101, and the arm 4 is housed inside the recess 102. Two L-shaped brackets 51, which are viewed in the left-right direction, are attached to the right side position of the arm 4 on the lower surface of the bogie main body 101 so as to face each other in the front-rear direction. The horizontal planes 511 of both brackets 51 are bolted to the bogie body 101, and the vertical planes 512 face each other in the front-rear direction, and the bell crank 5 is sandwiched between the vertical planes 512 and attached. The bell crank 5 is substantially L-shaped when viewed in the front-rear direction, and has a horizontal arm portion 52 extending toward the left side and a vertical arm portion 53 extending downward, and the horizontal arm portion 52 and the vertical arm portion 53. The connection part of is the center of rotation. A hole is formed in the center of rotation, and a crank shaft 54 made of a screw is inserted into the hole formed in the hole and the hole formed in the vertical surface 512 of both brackets 51. It is mounted rotatably around the axis. The left end of the horizontal arm 52 of the bell crank 5 is located below the right end of the arm 4. A connecting member 42 that opens downward in a U-shape when viewed from the left and right is provided on the lower side of the right end portion of the arm 4, and the left end portion of the horizontal arm portion 52 of the bell crank 5 is front and rear of the connecting member 42. The connecting member 42 and the left end portion of the horizontal arm portion 52 of the bell crank 5 are pin-joined so as to be rotatable with each other.

Next, the operation of the brake mechanism of the universal caster 1 configured in this way will be described. In a state where no external force acts on the brake mechanism, that is, in a normal state, as shown in FIG. 1A, the arm 4 is not in contact with the tip of the shaft portion 22 of the brake shoe 2, and the brake shoe 2 is not in contact with the tip of the shaft portion 22 of the brake shoe 2. It is in a state of being positioned on the upper side due to the urging force of the compression coil spring 27. In this state, the friction surface 23 of the brake shoe 2 is separated from the wheel 13, and the wheel 13 is in a rotatable free state. Then, as shown in FIGS. 3 and 4, when a rightward force is applied to the vertical arm portion 53 of the bell crank 5, the bell crank 5 rotates counterclockwise and the left end portion of the horizontal arm portion 52 descends. The arm 4 also descends against the elastic force of the fixture 41 made of a leaf spring material. Then, the arm 4 comes into contact with the tip of the shaft portion 22 of the brake shoe 2 and moves the brake shoe 2 downward against the urging force of the compression coil spring 27. Then, the friction surface 23 of the brake shoe 2 comes into contact with the wheel 13 from above, and the wheel 13 is in a non-rotatable locked state.

According to the brake mechanism of the universal caster 1 configured in this way, the brake shoe 2 moves up and down on the rotation axis X of the support portion 12, and is axially symmetric with respect to the rotation axis X of the support portion 12. Since the wheel 13 has a friction surface 23, the wheel 13 can be reliably locked because the friction surface 23 of the brake shoe 2 abuts on the wheel 13 in the same state regardless of the direction in which the wheel 13 is oriented around the vertical axis. .. FIG. 4 shows the wheel 13 facing in a different direction between the solid line and the alternate long and short dash line. Since the friction surface 23 of the brake shoe 2 is inclined downward from the outer peripheral side toward the shaft side, the friction surface 23 abuts on the surface of the wheel 13 in the locked state. Therefore, even when the wheel 13 is moved while the wheel 13 is locked, the brake shoe 2 does not bite into the wheel 13 and the wheel 13 is not damaged. Further, since the friction surface 23 of the brake shoe 2 has a steeper slope as it approaches the shaft side and has a curved line in which the generatrix becomes concave toward the lower side, the outer peripheral surface and shape of the circular wheel 13 are different. It is almost the same, and the contact area at the time of contact is large, and the braking effect is higher. Further, since a plurality of concentric grooves 24 are formed on the friction surface 23 and the surface has an uneven shape, the frictional force is large and the braking effect is higher.

Subsequently, the carriage 100 provided with the universal caster 1 and the brake mechanism 200 thereof will be described. In the following description of the dolly 100, the left and right sides indicate the left and right sides in FIG. 5A, the front side indicates the upper side of FIG. 5A, and the rear side indicates the lower side of FIG. 5A. As shown in FIG. 5A, the bogie 100 includes a rectangular flat plate-shaped bogie main body 101, and universal casters 1 are attached to four corners of the lower surface of the bogie main body 101, and each universal caster 1 is further attached. The brake mechanism 200 is attached. Further, an operation unit 6 is provided on the right side of the lower surface of the carriage body 101. The arm 4 of the brake mechanism 200 on the left side faces the center of the bogie main body 101, and the arm 4 of the brake mechanism 200 on the right side faces the left-right direction. Either direction does not affect the effect. A wire 7 is connected to the tip of the vertical arm portion 53 of the bell crank 5 of each brake mechanism 200 via a tension coil spring 71. Further, a tube 72 for passing the wire 7 is laid between each brake mechanism 200 and the operation unit 6. More specifically, one end of each tube 72 is fixed to an L-shaped fixing bracket 73 provided in the vicinity of each brake mechanism 200, and the other end has a long front-rear cross section provided in the central portion of the bogie main body 101. It is fixed side by side to the L-shaped fixing bracket 74. The four wires 7 extending from each brake mechanism 200 each extend through the tube 72 to the operation unit 6.

The operation unit 6 has a rectangular flat plate-shaped base plate 61 fixed to the lower surface of the trolley main body 101, an assembly block 62 to which four wires 7 are connected, and an assembly block on which the assembly block is mounted and slides with respect to the base plate 61. A possible slide plate 63, an operation lever 64 to be moved by the user, a rod 65 for connecting the slide plate 63 and the operation lever 64, and a regulating member 66 for restricting the movement of the operation lever 64 are provided. The fixing bracket 74 to which the four tubes 72 are fixed is also fixed to the left end portion of the base plate 61. The assembly block 62 is a rectangular parallelepiped metal block located on the right side of the fixing bracket 74, and four wires 7 extending from each brake mechanism 200 are arranged side by side and penetrate the assembly block 62 from the left side. It is fixed. The slide plate 63 is a substantially triangular flat plate that tapers toward the right side, and the assembly block 62 is fixed to the left end portion. An elongated hole 631 extending to the left and right is formed in the central portion of the slide plate 63, and is attached to the base plate 61 so as to pass a bolt shaft through the elongated hole 631. The slide plate 63 is attached to the base plate 61 with respect to the base plate 61. It is slidable to the left and right within the length range of the long hole 631. The operation lever 64 has a long flat plate shape on the left and right, and the right end portion protrudes toward the outer peripheral side of the bogie main body 101. Here, a rectangular flat plate-shaped leaf spring 67 smaller than the base plate 61 is provided on the right front side portion of the base plate 61, and the left end portion of the leaf spring 67 is fixed to the base plate 61. Further, a rectangular flat plate-shaped sub-plate 68 is attached to the leaf spring 67 so as to cover the entire surface except for the left end portion thereof. The left end portion of the operating lever 64 is rotatably attached to the sub-plate 68 around the vertical axis. Further, the auxiliary arm portion 641 extends from the rotation center portion of the operation lever 64 toward the rear side, and the auxiliary arm portion 641 of the operation lever 64 and the right end portion of the slide plate 63 are connected by a rod 65 extending to the left and right. Has been done. The connecting portions of the rod 65 and the auxiliary arm portion 641 and the slide plate 63 all have a ball joint structure. As a result, when the operation lever 64 is moved to the front side, the slide plate 63 moves to the right side, and when the operation lever 64 is moved to the rear side, the slide plate 63 moves to the left side. A rubber cushion material 69 that comes into contact with the operation lever 64 from the rear side when the operation lever 64 is located on the rear side is provided at the right end portion of the base plate 61. The regulating member 66 is made of a shape member having an L-shaped cross section that extends in the front-rear direction attached to the right end portion of the lower surface of the bogie body 101, and the vertical surface 661 extending downward from the lower surface of the bogie body 101 is the right end surface of the bogie body 101. It is flush. As shown in FIG. 5B, a slit-shaped regulation hole 662 extending in the front-rear direction is formed in the vertical surface 661, and the operation lever 64 penetrates the regulation hole 662. The regulation hole 662 is wide on the upper side at the front end portion and the rear end portion, and each of these portions is a locking portion 663 into which the operation lever 64 is fitted. The operating lever 64 is urged upward by the leaf spring 67, and its operation is restricted by fitting it into the locking portions 663 on the front side and the rear side, and the operating lever 64 resists the urging force of the leaf spring 67. When you push it down, you can move it back and forth.

Further, fence members 8 are attached to the front edge portion and the trailing edge portion of the bogie main body 101, respectively. The fence member 8 is made of a profile having an L-shaped cross section extending to the left and right, and is composed of a horizontal portion 81 and a vertical portion 82, and the horizontal portion 81 is in contact with the lower surface of the bogie main body 101 and is bolted. The vertical portion 82 extends upward along the front end surface or the rear end surface of the carriage body 101, and the upper end of the vertical portion 82 projects upward from the upper surface of the carriage body 101. The fence member 8 at the leading edge has a long hole for passing a bolt for fixing the horizontal portion 81 to the trolley main body 101 in the front-rear direction, and the fence is made by loosening the wing nut screwed to the bolt. The member 8 can be moved back and forth, and the front and rear position of the fence member 8 can be adjusted. Further, the upper surface of the dolly body 101 is entirely covered with a sheet made of a non-slip material. On the lower surface of the bogie main body 101, the tension coil spring 71 and the operation unit 6 connected to each brake mechanism 200 may be injured by the operator or may be injured by contact with a structure on the floor surface. To prevent this, it is desirable to cover from below with a cover.

Next, the operation of the brake mechanism 200 of the carriage 100 configured in this way will be described. In the normal state, the operation lever 64 is fitted in the locking portion 663 on the rear side of the regulation hole 662. In this state, the auxiliary arm portion 641 of the operating lever 64 is located on the left side of the rotation center portion, the slide plate 63 and the gathering block 62 are also located on the left side, and the tension coil spring connected to each brake mechanism 200. No tensile force is acting on 71. Therefore, since no force is applied to the bell crank 5 of each brake mechanism 200, the wheel 13 is in a rotatable free state. Then, when the brake is applied, the operation lever 64 is moved to the front side to fit into the locking portion 663 on the front side of the regulation hole 662. In this state, the auxiliary arm portion 641 of the operation lever 64 is located on the right side of the rotation center portion, the slide plate 63 and the gathering block 62 are also located on the right side, each wire 7 is pulled, and each brake mechanism. A tensile force acts on the tension coil spring 71 connected to the 200. Therefore, since the force also acts on the bell crank 5 of each brake mechanism 200, all the wheels 13 are in a non-rotatable locked state. Since each wire 7 is connected to the tension coil spring 71, a force for moving the operating lever 64 to the rear side acts on the operating lever 64 in the locked state, but the operating lever 64 has a locking portion 663 on the front side. It doesn't move because it fits in. When the operating lever 64 is pushed down from that state and released from the locking portion 663, the operating lever 64 vigorously moves backward due to the tensile force of the tension coil spring 71, but the impact at that time is absorbed by the cushion material 69.

According to the bogie 100 configured in this way, since all four casters provided on the bogie main body 101 are universal casters 1, the bogie main body 101 can be turned on the spot, so that it is easy to use even in a narrow place. If the wheels 13 are individually switched between the free state and the locked state for the plurality of free casters 1, it takes a lot of time and effort and the operability is poor. However, in this trolley 100, one operation lever 64 is used. By the operation of, all the wheels 13 can be changed from the free state to the locked state and from the locked state to the free state at once, and the operability is good. At this time, since the brake mechanism 200 has the above-described configuration, the wheels 13 can be reliably locked regardless of the direction in which each wheel 13 is oriented around the vertical axis. Further, the brake mechanism 200 of the universal caster 1 and its operation unit 6 are all provided on the lower surface of the bogie main body 101, and the upper surface of the bogie main body 101 is a completely flat surface, so that articles can be loaded and unloaded on the bogie main body 101. It does not interfere with the operation. Further, the fence members 8 provided in the front and rear of the trolley body 101 prevent the placed article from falling and the front and rear positions of the front fence member 8 can be adjusted, so that the article is wider than the front and rear width of the trolley body 101. Can also be handled. Further, in all the brake mechanisms 200, since the bell crank 5 and the wire 7 are connected via the tension coil spring 71, the tension coil spring 71 serves as a cushioning material, and the tensile force is concentrated only on a part of the bell crank 5. All the wheels 13 can be securely locked by applying a force to the bell cranks 5 of all the brake mechanisms 200. If the tension coil spring 71 is replaced with one having a different spring constant, the force acting on the bell crank 5 of each brake mechanism 200 also changes, so that the braking force on the wheel 13 can be adjusted.

This dolly can be used for various purposes. In particular, since it has a simple structure with no handle on the upper surface of the dolly body, it is suitable not only for simply placing and moving the article, but also for using the article by leaving it in a stationary state. As a specific example of use, for example, in a general household, a heating device such as a fan heater may be mounted and used. If you put the heater on this dolly, you can easily move it to a place where people are and put it away when not in use. Then, the heater can be used while it is mounted on the trolley. In that case, if all the wheels are locked by the brake mechanism, it is safe because the dolly will not move even if an earthquake occurs while using the heater. In addition, a rack of documents and books may be mounted and used in an office, and a rack of parts and tools may be mounted and used in a factory. When the article is placed on the trolley and moved, the article may be directly touched and moved.

The present invention is not limited to the above embodiments. The shape of the friction surface of the brake shoe can be appropriately changed according to the material of the brake shoe and the wheel and the required braking performance. For example, the friction surface may have the same gradient from the outer peripheral side to the shaft side and the generatrix may be a straight line. It is desirable that the gradient from the outer peripheral side to the shaft side of the friction surface substantially coincides with the circumferential direction of the portion in contact with the friction surface of the wheel regardless of whether the generatrix is a straight line or a curved line. The friction surface may have a flat surface without grooves. Further, in the above embodiment, the arm of the operating mechanism is housed in a rectangular recess formed in the bogie body to be mounted, but the shape of the recess may be any shape, and other than the arm. A part or all of the members may be housed in the recess together with the arm. Further, in the above embodiment, the operation lever protrudes from the bogie body to the outer peripheral side for easy operation, but the protruding operation lever may be an obstacle depending on the usage situation. In that case, the operation lever May not protrude from the dolly body. Further, a hole may be formed in the peripheral edge of the dolly body to serve as a handle for carrying the dolly.

1 Swivel caster 11 Foundation part 12 Support part 13 Wheel 2 Brake shoe 23 Friction surface 3 Operation mechanism

Claims (1)

Around the foundation that is fixed to the mounting target, a support that is provided under the foundation and is rotatable around the vertical axis, and a horizontal axis that is provided on the support and is eccentric to the rotation axis of the support. It is a brake mechanism of a universal caster with wheels that can rotate freely.
Equipped with a brake shoe that is located on the rotation axis of the support and can move up and down, and an operation mechanism that moves the brake shoe up and down.
The brake shoe has a friction surface that is axially symmetric with respect to the rotation axis of the support portion and inclines downward from the outer peripheral side toward the shaft side, and the friction surface is separated from the wheel when it is located on the upper side. A universal caster brake mechanism, characterized in that the friction surface abuts on the wheel from above when located on the lower side.

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