Caster structure

Abstract

To provide a caster structure which can reliably hold a stop state of a movable body.SOLUTION: A caster structure comprises: a lower opening housing 1 which is fitted in a hole Y of a bottom surface plate A of a movable body from below; an elevational slide body 3 which is so provided in the housing 1 as to be vertically slidable, and is always elastically energized upward by a coil spring 2; a wheel holding body 4 which is held in the elevational slide body 3 so as to be rotatable around a vertical axis L0; and a wheel 5 which is so held by the wheel holding body 4 as to be rotatable around a first horizontal axis L1. A hole 7 is provided through an upper wall 6 of the housing 1, a switching lever 8 is pivoted to the housing 1 so as to be capable of oscillating around a second horizontal axis L2 traversing the hole 7 in a plan view, and by oscillating the switching lever 8, a base end boss part 9 of the switching lever 8 can freely push up the elevational slide body 3 against an elastic energization force of the coil spring 2.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to a caster structure. [Background technology]

[0002] Generally, casters are attached to the lower part of a movable body to enable the movable body to move freely (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Utility Model Registration No. 3197416 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the caster structure described in Patent Document 1 is a structure that stops the moving body by stopping the rotation of the wheels and leaving part of the wheels in contact with the ground, and has the problem that the whole structure shakes when stopped. Therefore, the object of the present invention is to provide a caster structure that can reliably hold a moving body in a stopped state. [Means for solving the problem]

[0005] The caster structure of the present invention comprises a downward-opening housing that is fitted from below into a hole in the bottom plate of a movable body, a lift-up slide body that is arranged inside the housing so that it can slide up and down, a wheel holder that is held inside the lift-up slide body so that it can rotate around a vertical axis, and a wheel that is held by the wheel holder so that it can rotate around a first horizontal axis, and a hole is formed through the upper wall of the housing, and a switching lever is pivotally attached to the housing so that it can swing around a second horizontal axis that crosses the hole in a plan view, and when the switching lever is swung in one direction, the base end boss portion of the switching lever presses down the lift-up slide body, maintaining a wheel-traveling state in which the wheel protrudes below the bottom surface of the housing, and when the switching lever is swung in the other direction, the wheel is configured to be in a wheel-storable state in which it can be stored at a position above the bottom surface of the housing.

[0006] The movable body further comprises a downwardly opening housing fitted from below into a hole in a bottom plate of the movable body, a lifting slide body provided inside the housing so as to be able to slide up and down and which is constantly resiliently biased upward by a coil spring, a wheel holder held inside the lifting slide body so as to be able to rotate about a vertical axis, and a wheel held by the wheel holder so as to be able to rotate about a first horizontal axis, a hole is formed through the upper wall of the housing, and a switching lever is pivotally attached to the housing so as to be able to swing about a second horizontal axis which crosses the hole in a plan view, and when the switching lever is swung to one side, a base end boss portion of the switching lever presses down the lifting slide body against the resiliency of the coil spring, so that the wheel protrudes below the bottom surface of the housing and is in a wheel-traveling state, and when the switching lever is swung to the other side, the wheel is in a wheel-stored state and is stored at a position above the bottom surface of the housing, so that the movable body is configured to be freely switchable.

[0007] The device further comprises a downwardly opening housing fitted from below into a hole in a bottom plate of the movable body, a lifting slide body provided inside the housing so as to be able to slide up and down, a wheel holder held inside the lifting slide body so as to be able to rotate about a vertical axis, and a wheel held by the wheel holder so as to be able to rotate about a first horizontal axis, a hole is formed through the upper wall of the housing, and a switching lever is pivotally attached to the housing so as to be able to swing about a second horizontal axis that crosses the hole in a plan view, and when the switching lever is swung in one direction, the base end boss portion of the switching lever presses down the lifting slide body, maintaining a wheel-running state in which the wheel protrudes below the lowest part of the movable body, and when the switching lever is swung in the other direction, the wheel is configured to be able to be stored in a wheel storage state in which it can be stored above the lowest part of the movable body.

[0008] The device further comprises a downwardly opening housing fitted from below into a hole in a bottom plate of the movable body, a lift-up slide body provided inside the housing so as to be able to slide up and down and which is constantly resiliently biased upward by a coil spring, a wheel holder held inside the lift-up slide body so as to be able to rotate about a vertical axis, and a wheel held by the wheel holder so as to be able to rotate about a first horizontal axis, a hole is formed through the upper wall of the housing, and a switching lever is pivotally attached to the housing so as to be able to swing about a second horizontal axis which crosses the hole in a plan view, and when the switching lever is swung to one side, a base end boss portion of the switching lever presses down the lift-up slide body against the resiliency of the coil spring, so that the wheel protrudes downward below the lowest part of the movable body and is in a wheel-traveling state, and when the switching lever is swung to the other side, the wheel is in a wheel-stored state and is stored at a position above the lowest part of the movable body, so that the device is configured to be freely switchable.

[0009] In addition, the base end boss portion has two parallel planes facing the outer peripheral surface of the base end boss portion, and the distance dimension between the second horizontal axis and one of the planes is set to be smaller than the distance dimension between the second horizontal axis and the other plane. The housing also has a locking claw for preventing the housing from slipping out of the hole. Effect of the Invention

[0010] According to the caster structure of the present invention, a moving body can be reliably maintained in a stopped state. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a perspective view showing a state in which the first embodiment of the present invention is used. [Diagram 2] FIG. 1 is a perspective view showing a first embodiment of the present invention. [Diagram 3] 13 is a cross-sectional side view showing a state in which the switching lever is swung to one side. FIG. [Figure 4] 13 is a cross-sectional side view showing a state in which the switching lever is swung to the other side. FIG. [Diagram 5] FIG. [Figure 6] FIG. 4 is a simplified cross-sectional view for explaining a base end boss portion. [Figure 7] FIG. [Figure 8] FIG. [Figure 9] FIG. 11 is a sectional side view showing a state in which a switching lever of a third embodiment is swung to one side. [Figure 10] 13 is a cross-sectional side view showing a state in which the switching lever is swung to the other side. FIG. [Figure 11] 13 is a cross-sectional side view showing a main part of another example of a moving body. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] The present invention will be described in detail below based on the illustrated embodiments. Fig. 1 shows the first embodiment of the present invention in use. The caster structure C is fitted into the hole Y in the bottom plate A of the movable body from below, as shown by the arrow N in Fig. 1. For example, it is attached to the four corners of the bottom plate A of the movable body.

[0013] 1 to 5, the device includes a downwardly opening housing 1 that is attached to a bottom plate A of a movable body that is to be moved or held stationary (for example, a legged side table for a sick bed, various types of carts, etc.). The housing 1 is made up of a downwardly opening housing main body 1A and a bottom wall ring body 1B that is attached to the lower part of the housing main body 1A.

[0014] The housing 1 includes an ascent / descent slide body 3 that is provided inside the housing 1 so as to be vertically slidable and is constantly biased upward by a coil spring 2. The ascent / descent slide body 3 has a pair of convex parts 17 (see FIG. 8 ) that protrude radially outward, and a vertical groove 19 is formed on an inner surface 18 of the housing 1 so that the convex parts 17 are vertically slidable within the vertical groove 19.

[0015] The lift-up slide body 3 includes a wheel holder 4 held inside the lift-up slide body 3 so as to be rotatable around a vertical axis L0. The wheel holder 4 is held in a suspended state on the lift-up slide body 3. That is, the lift-up slide body 3 has a downwardly protruding cylindrical portion 20, and a radially outwardly protruding annular protrusion 22 is formed on an outer circumferential surface 21 of the cylindrical portion 20. A part of the wheel holder 4 (around a central hole 24) is engaged in a resting state on the annular protrusion 22. A lower annular groove 13 is formed on an upper surface 12 of the wheel holder 4, and an upper annular groove 15 is formed on a lower surface 14 of the lift-up slide body 3. A large number of spheres 16 are held between the lower annular groove 13 and the upper annular groove 15. A wheel 5 is held on the wheel holder 4 so as to be rotatable around a first horizontal axis L1.

[0016] A hole 7 is provided through an upper wall 6 of the housing 1, and a switching lever 8 is pivotally attached to the housing 1 so as to be swingable about a second horizontal axis L2 that crosses the hole 7 in a plan view. The second horizontal axis L2 is eccentric with respect to a base end boss portion 9 of the switching lever 8. That is, as shown in FIG. 6, the base end boss portion 9 has two parallel planes 23 (23A), 23 (23B) that face an outer circumferential surface 25 (of the base end boss portion 9). A distance dimension H1 between the second horizontal axis L2 and one plane 23A of the two planes 23 is set to be smaller than a distance dimension H2 between the second horizontal axis L2 and the other plane 23B of the two planes 23 (23A), 23 (23B).

[0017] As shown in Fig. 3, when the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3 against the resilient force F of the coil spring 2, resulting in a wheel-traveling state in which the wheels 5 protrude below the bottom surface 10 of the housing 1, and as shown in Fig. 4, when the switching lever 8 is swung in the other direction, the wheel-retracted state in which the wheels 5 are retracted at a position above the bottom surface 10 of the housing 1 is reached. In the wheel-retracted state, the bottom surface 10 of the housing 1 comes into contact with the ground.

[0018] When the switching lever 8 is swung to the other side, the one plane 23A of the base end boss portion 9 comes into contact with the lift-up slide body 3, maintaining the wheels in a stored state, and when the switching lever 8 is swung to one side, the other plane 23B of the base end boss portion 9 comes into contact with the lift-up slide body 3, maintaining the wheels in a running state.

[0019] The housing 1 is attached by being inserted from below into and fitted into a hole Y formed through the bottom plate A, and has a locking claw 11 (see Figs. 2, 5 and 7) for preventing the housing 1 from slipping out of the hole Y. The shape of the hole Y is non-circular (for example, elliptical), and the outer contour shape of the insertion portion of the housing 1 into the hole Y is formed into a non-circular shape (for example, elliptical) that corresponds to the shape of the hole Y. This makes it possible to prevent the housing 1 from rotating.

[0020] The second embodiment will be described. The coil spring 2 is not provided. The other configurations are the same as those of the first embodiment. When the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3, and the wheels 5 are kept in a wheel-traveling state in which they protrude below the bottom surface 10 of the housing 1, and when the switching lever 8 is swung in the other direction, the wheels 5 are in a wheel-storable state in which they can be stored at a position above the bottom surface 10 of the housing 1. This configuration is freely switchable.

[0021] A third embodiment will be described. As shown in Fig. 9, when the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3 against the resilient force F of the coil spring 2, and the wheels 5 project downward from the lowest part E of the moving body, thereby enabling the wheels to run. As shown in Fig. 10, when the switching lever 8 is swung in the other direction, the wheels 5 are stored in a position above the lowest part E of the moving body, thereby enabling the wheels to run. In the wheel stored state, the lowest part E of the moving body (for example, the entire circumferential edge or four corners of the moving body) is in contact with the ground. The other configurations are the same as those of the first embodiment. 11 shows a case where the movable body has, for example, a protective member 26 made of an elastic material such as rubber on the entire peripheral edge. A part of the protective member 26 becomes the lowermost part E of the movable body.

[0022] A fourth embodiment will be described. The coil spring 2 is not provided. The other configurations are the same as those of the third embodiment. When the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3, and the wheels 5 maintain a wheel-traveling state in which they protrude below the lowest part E of the moving body, and when the switching lever 8 is swung in the other direction, the wheels 5 enter a wheel-storing state in which they can be stored above the lowest part E of the moving body. This configuration is freely switchable.

[0023] The present invention is subject to design modifications. For example, the outer contour shape of the hole Y and the portion of the housing 1 that is inserted into the hole Y may be circular.

[0024] As described above, the present invention provides a movable body having a downwardly opening housing 1 that is fitted from below into a hole Y in a bottom plate A of the movable body, a lifting slide body 3 provided inside the housing 1 so as to be able to slide up and down, a wheel holder 4 held inside the lifting slide body 3 so as to be able to rotate about a vertical axis L0, and a wheel 5 held by the wheel holder 4 so as to be able to rotate about a first horizontal axis L1. A hole 7 is formed through an upper wall 6 of the housing 1, and the wheel 5 is cut so as to be able to swing freely around a second horizontal axis L2 that crosses the hole 7 in a plan view. A switching lever 8 is pivotally attached to the housing 1, and when the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3, maintaining the wheels 5 in a wheel-traveling state in which they protrude below the bottom surface 10 of the housing 1, and when the switching lever 8 is swung in the other direction, the wheels 5 are in a wheel-storable state in which they can be stored at a position above the bottom surface 10 of the housing 1.This configuration allows the moving body to be reliably maintained in a stopped state.

[0025] In addition, it is difficult for it to come off from the hole Y formed through the bottom plate A, and has excellent strength. In addition, when the wheels can be stored, it is suitable for grounding the bottom surface 10 of the housing 1, and has the effect that the moving body does not rattle, stops stably, and is less likely to damage the floor.

[0026] The movable body further comprises a downwardly opening housing 1 fitted from below into a hole Y in a bottom plate A of the movable body, a lifting slide body 3 provided inside the housing 1 so as to be vertically slidable and constantly biased upward by a coil spring 2, a wheel holder 4 held inside the lifting slide body 3 so as to be rotatable about a vertical axis L0, and a wheel 5 held by the wheel holder 4 so as to be rotatable about a first horizontal axis L1. A hole 7 is formed through an upper wall 6 of the housing 1, and the wheel 5 is cut so as to be swingable about a second horizontal axis L2 that crosses the hole 7 in a plan view. A switching lever 8 is pivotally attached to the housing 1, and when the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3 against the elastic force F of the coil spring 2, so that the wheels 5 protrude downward below the bottom surface 10 of the housing 1 and are in a wheel-traveling state, and when the switching lever 8 is swung in the other direction, the wheels 5 are stored in a position above the bottom surface 10 of the housing 1 and are in a wheel-stored state.Since the switching lever is configured to be freely switchable, the stopped state of the moving body can be reliably maintained.

[0027] In addition, it is difficult for the wheels to come out of the holes Y formed through the bottom plate A, and has excellent strength. In addition, in the wheel storage state, it is suitable for grounding the bottom surface 10 of the housing 1, and has the effect that the moving body does not rattle, stops stably, and is less likely to damage the floor. Furthermore, in the wheel travelling state, the wheels 5 are prevented from rattling (by the coil spring 2).

[0028] The movable body further includes a downwardly opening housing 1 fitted from below into a hole Y in a bottom plate A of the movable body, a lifting slide body 3 provided inside the housing 1 so as to be able to slide up and down, a wheel holder 4 held inside the lifting slide body 3 so as to be able to rotate about a vertical axis L0, and a wheel 5 held by the wheel holder 4 so as to be able to rotate about a first horizontal axis L1. A hole 7 is formed through an upper wall 6 of the housing 1, and a switching lever is provided so as to be able to swing about a second horizontal axis L2 that crosses the hole 7 in a plan view. A bar 8 is pivotally attached to the housing 1, and when the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3, maintaining a wheel-running state in which the wheels 5 protrude below the lowest part E of the movable body, and when the switching lever 8 is swung in the other direction, the wheels 5 are placed in a wheel-storable state in which they can be stored at a position above the lowest part E of the movable body.This is a freely switchable configuration, so that the stationary state of the movable body can be reliably maintained.

[0029] It also has excellent strength and is difficult to come off from the hole Y formed through the bottom plate A. The lowest part E of the movable body is disposed (in a line or a plane) on the outer periphery of the bottom plate A of the movable body, so that when the wheels are retractable, the movable body is in a stable position and is prevented from tipping over.

[0030] The movable body further comprises a downwardly opening housing 1 fitted from below into a hole Y in a bottom plate A of the movable body, a lifting slide body 3 provided inside the housing 1 so as to be vertically slidable and constantly biased upward by a coil spring 2, a wheel holder 4 held inside the lifting slide body 3 so as to be rotatable about a vertical axis L0, and a wheel 5 held by the wheel holder 4 so as to be rotatable about a first horizontal axis L1. A hole 7 is formed through an upper wall 6 of the housing 1, and the wheel 5 is swingable about a second horizontal axis L2 that crosses the hole 7 in a plan view. A switching lever 8 is pivotally attached to the housing 1, and when the switching lever 8 is swung in one direction, the base end boss portion 9 of the switching lever 8 presses down the lifting slide body 3 against the elastic force F of the coil spring 2, so that the wheels 5 protrude downward below the lowest part E of the movable body and are in a wheel-running enabled state, and when the switching lever 8 is swung in the other direction, the wheels 5 are stored in a wheel-stored state in which they are stored at a position above the lowest part E of the movable body. This configuration allows the movable body to be reliably maintained in a stopped state.

[0031] In addition, it is difficult for the movable body to come off from the hole Y formed through the bottom plate A, and has excellent strength. Also, the lowest part E of the movable body is arranged (in a line or a plane) on the outer periphery of the bottom plate A of the movable body, so that in the wheel storage state, the movable body is in a stable position and can be prevented from tipping over. Furthermore, in the wheel travelling state, the wheels 5 are prevented from rattling (by the coil spring 2).

[0032] In addition, the base end boss portion 9 has two parallel planes 23A, 23B facing the outer peripheral surface 25 of the base end boss portion 9, and the distance dimension H1 between the second horizontal axis L2 and one plane 23A is set to be smaller than the distance dimension H2 between the second horizontal axis L2 and the other plane 23B. Therefore, when the switching lever 8 is swung to the other side, (when placed on the floor G), one plane 23A of the base end boss portion 9 comes into contact with the lift-up slide body 3 to maintain the wheel storage state, and when the switching lever 8 is swung to one side, the other plane 23B of the base end boss portion 9 comes into contact with the lift-up slide body 3 to maintain the wheel running state.

[0033] In addition, the housing 1 has locking claws 11 for preventing the housing 1 from slipping out of the hole Y, so that the housing 1 can be securely attached (fixed) to the bottom plate A. Since the housing 1 is attached to the bottom plate A without using screws or bolts, attachment and detachment can be performed quickly and easily. [Explanation of symbols]

[0034] 1. Housing 2 Coil spring 3 Lifting slide body 4 Wheel holder 5 wheels 6 Upper wall 7 holes 8 Switching lever 9 Base end boss 10 Bottom 11 Locking claw A (mobile body) bottom plate E (of a moving object) F. Repulsive force G floor H1 distance dimension H2 distance dimension L0 vertical axis center L1 1st horizontal axis center L2 2nd horizontal axis Y hole

Claims

1. The movable body has a downwardly opening housing (1) that is fitted from below into a hole (Y) in a bottom plate (A) of the movable body, a lifting slide body (3) that is provided inside the housing (1) so as to be able to slide up and down, and a vertical axis (L) inside the lifting slide body (3). 0 A wheel holder (4) is supported so as to be rotatable around a first horizontal axis (L 1 and a wheel (5) supported rotatably around the base (1), A hole (7) is formed through the upper wall (6) of the housing (1), and a second horizontal axis (L 2 A switching lever (8) is pivotally attached to the housing (1) so as to be swingable around the When the switching lever (8) is swung in one direction, the base end boss portion (9) of the switching lever (8) presses down the lifting slide body (3) to maintain a wheel-traveling state in which the wheels (5) protrude below the bottom surface (10) of the housing (1), and when the switching lever (8) is swung in the other direction, the wheels (5) are configured to be in a wheel-storable state in which they can be stored at a position above the bottom surface (10) of the housing (1). the second horizontal axis (L 2 ) is located below an upper end of the housing (1) and above the hole (7), and the switching lever (8) is configured to swing above the hole (7); the base end boss portion (9) has two parallel flat surfaces (23A) and (23B) facing an outer circumferential surface (25) of the base end boss portion (9), and a distance dimension (H1) between the second horizontal axis (L2) and one flat surface (23A) is set smaller than a distance dimension (H2) between the second horizontal axis (L2) and the other flat surface (23B); In the wheel-traveling state, the base end boss portion (9) of the switching lever (8) does not protrude upward from the upper end of the housing (1), and in the wheel-storing state, the base end boss portion (9) of the switching lever (8) is configured to protrude upward from the upper end of the housing (1). Caster structure.

2. The movable body has a downwardly opening housing (1) fitted from below into a hole (Y) in a bottom plate (A) of the movable body, a lifting slide body (3) that is provided inside the housing (1) so as to be able to slide up and down and is always resiliently biased upward by a coil spring (2), and a vertical axis (L) inside the lifting slide body (3). 0 A wheel holder (4) is supported so as to be rotatable around a first horizontal axis (L 1 and a wheel (5) supported rotatably around the base (1), A hole (7) is formed through the upper wall (6) of the housing (1), and a second horizontal axis (L 2 A switching lever (8) is pivotally attached to the housing (1) so as to be swingable around the When the switching lever (8) is swung in one direction, the base end boss portion (9) of the switching lever (8) presses down the lifting slide body (3) against the elastic force (F) of the coil spring (2), so that the wheels (5) protrude downward from the bottom surface (10) of the housing (1) and enter a wheel-running possible state, and when the switching lever (8) is swung in the other direction, the wheels (5) enter a wheel-storable state in which they can be stored at a position above the bottom surface (10) of the housing (1). the second horizontal axis (L 2 ) is located below an upper end of the housing (1) and above the hole (7), and the switching lever (8) is configured to swing above the hole (7); the base end boss portion (9) has two parallel flat surfaces (23A) and (23B) facing an outer circumferential surface (25) of the base end boss portion (9), and a distance dimension (H1) between the second horizontal axis (L2) and one flat surface (23A) is set smaller than a distance dimension (H2) between the second horizontal axis (L2) and the other flat surface (23B); In the wheel-traveling state, the base end boss portion (9) of the switching lever (8) does not protrude upward from the upper end of the housing (1), and in the wheel-storing state, the base end boss portion (9) of the switching lever (8) is configured to protrude upward from the upper end of the housing (1). Caster structure.

3. The movable body has a downwardly opening housing (1) that is fitted from below into a hole (Y) in a bottom plate (A) of the movable body, a lifting slide body (3) that is provided inside the housing (1) so as to be able to slide up and down, and a vertical axis (L) inside the lifting slide body (3). 0 A wheel holder (4) is supported so as to be rotatable around a first horizontal axis (L 1 and a wheel (5) supported rotatably around the base (1), A hole (7) is formed through the upper wall (6) of the housing (1), and a second horizontal axis (L 2 A switching lever (8) is pivotally attached to the housing (1) so as to be swingable around the When the switching lever (8) is swung in one direction, the base end boss portion (9) of the switching lever (8) presses down the lifting slide body (3), maintaining a wheel-traveling state in which the wheels (5) protrude below the lowest part (E) of the moving body, and when the switching lever (8) is swung in the other direction, the wheel (5) is placed in a wheel-storable state in which it can be stored at a position above the lowest part (E) of the moving body. This configuration is freely switchable. the second horizontal axis (L 2 ) is located below an upper end of the housing (1) and above the hole (7), and the switching lever (8) is configured to swing above the hole (7); the base end boss portion (9) has two parallel flat surfaces (23A) and (23B) facing an outer circumferential surface (25) of the base end boss portion (9), and a distance dimension (H1) between the second horizontal axis (L2) and one flat surface (23A) is set smaller than a distance dimension (H2) between the second horizontal axis (L2) and the other flat surface (23B); In the wheel-traveling state, the base end boss portion (9) of the switching lever (8) does not protrude upward from the upper end of the housing (1), and in the wheel-storing state, the base end boss portion (9) of the switching lever (8) is configured to protrude upward from the upper end of the housing (1). Caster structure.

4. The movable body has a downwardly opening housing (1) fitted from below into a hole (Y) in a bottom plate (A) of the movable body, a lifting slide body (3) that is provided inside the housing (1) so as to be able to slide up and down and is always resiliently biased upward by a coil spring (2), and a vertical axis (L) inside the lifting slide body (3). 0 A wheel holder (4) is supported so as to be rotatable around a first horizontal axis (L 1 and a wheel (5) supported rotatably around the base (1), A hole (7) is formed through the upper wall (6) of the housing (1), and a second horizontal axis (L 2 A switching lever (8) is pivotally attached to the housing (1) so as to be swingable around the When the switching lever (8) is swung in one direction, the base end boss portion (9) of the switching lever (8) presses down the lifting slide body (3) against the resilient force (F) of the coil spring (2), so that the wheels (5) protrude downward from the lowest part (E) of the movable body, thereby enabling the movable body to be in a wheel-running state, and when the switching lever (8) is swung in the other direction, the wheels (5) protrude downward from the lowest part (E) of the movable body, thereby enabling the movable body to be in a wheel-storable state, so that the movable body can be freely switched. the second horizontal axis (L 2 ) is located below an upper end of the housing (1) and above the hole (7), and the switching lever (8) is configured to swing above the hole (7); the base end boss portion (9) has two parallel flat surfaces (23A) and (23B) facing an outer circumferential surface (25) of the base end boss portion (9), and a distance dimension (H1) between the second horizontal axis (L2) and one flat surface (23A) is set smaller than a distance dimension (H2) between the second horizontal axis (L2) and the other flat surface (23B); In the wheel-traveling state, the base end boss portion (9) of the switching lever (8) does not protrude upward from the upper end of the housing (1), and in the wheel-storing state, the base end boss portion (9) of the switching lever (8) is configured to protrude upward from the upper end of the housing (1). Caster structure.

5. The caster structure according to any one of claims 1 to 4, wherein the housing (1) has a locking claw (11) for preventing the housing (1) from slipping out of the hole (Y).

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