JP7405474B1 - Casters, beds and trolleys - Google Patents

Abstract

An object of the present invention is to provide casters, a truck, and a bed that can be reliably locked and unlocked with a light force. [Solution] A caster 10 includes a jig 11 fixed to an object to be transported, a wheel 14 to which a shaft 13 is connected to the center of rotation, and a wheel 14 and a jig 11 that support the wheel 14 and the jig 11 respectively. a shaft case 12 that connects the shaft case 12; a stopper member 24 that can come into contact with the wheel 39 of the wheel 14; a stopper mechanism 15 having a toggle structure including the stopper member 24; 39 to stop the rotation of the wheel 14. The stopper mechanism 15 presses the stopper member 24 against the wheel 39 at a substantially right angle. [Selection diagram] Figure 4

Description

The present invention relates to casters and equipment made movable by casters.

There are two types of caster stopper mechanisms: a friction type that prevents the rotation of the wheel by friction between the wheel and the stopper mechanism, and a lock type that uses a rigid object inserted into the wheel rotation mechanism to prevent the wheel from rotating using the rigidity of the rigid object. It can be broadly divided into
With a lock-type stopper mechanism, there is little wear on the wheels and the stopper mechanism, and rotation of the wheels can be stopped immediately after locking.
Although there are various known lock-type stopper mechanisms, it is desired that any of them be able to perform the locking function without failing to lock when the lock is applied.

JP2017-039405A

For example, if the casters of a medical bed have heavy locking and unlocking operations, there is a problem in that not only does this place a burden on the operator, but also a patient lying on the bed receives a shock from the recoil each time the caster is operated. Another problem was that when the operation was heavy, the operation sound also tended to become louder.

The present invention was made in consideration of such circumstances, and an object of the present invention is to provide casters, a trolley, and a bed that can be reliably locked and unlocked with a light force.

The caster according to the present embodiment includes a jig fixed to an object to be transported, a wheel having a shaft connected to the center of rotation, and a connection between the wheel and the jig by supporting the wheel and the jig respectively. a shaft case capable of contacting the wheel of the wheel, a stopper mechanism having a toggle structure including the stopper member, and causing the stopper member to contact the wheel by deforming the toggle structure. an operating mechanism for stopping the rotation of the wheel, the stopper mechanism pressing the stopper member against the wheel at a substantially right angle.

Further, the bed according to the present embodiment includes a jig fixed to an object to be transported, a wheel having a shaft connected to the rotation center, a leg supported by the wheel by the jig, and the wheel and the jig. The toggle structure is modified by having a toggle structure including a shaft case that pivotally supports the tools and connects the wheel and the jig, a stopper member that comes into contact with the wheel of the wheel, and the stopper member. A stopper mechanism for fitting the wheel lock tooth into the wheel receiving tooth is provided, and the stopper mechanism presses the stopper member against the wheel at a substantially right angle.

Moreover, the trolley according to this embodiment is provided with the casters.

The present invention provides casters, a trolley, and a bed that can be reliably locked and unlocked with a light force.

(A) A schematic perspective view showing an example of a bed to which the casters according to the first embodiment are applied, and (B) a schematic perspective view showing an example of a trolley to which the casters according to the first embodiment are applied. (A) A schematic perspective view showing an example of a rack to which the casters according to the first embodiment are applied. (B) A schematic perspective view showing an example of a bag with casters to which the casters according to the first embodiment are applied. FIG. 1 is a perspective view of casters according to the first embodiment. FIG. 4 is a perspective view showing the internal configuration of the shaft case, with the upper shaft case removed from FIG. 3; FIG. 5 is a perspective view of the caster from FIG. 4 excluding the lower shaft case, looking down from the rear side. FIG. 3 is an enlarged side view of the vicinity of the rotation limiting mechanism in the first embodiment. (A) A diagram showing the stopper mechanism in an unlocked state, and (B) a diagram showing the stopper mechanism in a locked state. (A) A perspective view showing a stopper mechanism in the second embodiment, (B) a perspective view showing a modification of the stopper mechanism in the second embodiment. FIG. 7 is a perspective view of a caster according to a third embodiment. (A) A side view showing the unlocked state of the rotation stop mechanism according to a modification of the third embodiment, and (B) a side view showing the same in the locked state. FIG. 7 is a perspective view showing a caster rotation stop mechanism and peripheral members thereof according to a fourth embodiment. FIG. 7 is a partially enlarged sectional view showing a cross section of the caster according to the fourth embodiment, cut horizontally at the height of the toothed ring. (A) A perspective view showing a caster according to a modified example of the fourth embodiment in an unlocked state, and (B) a perspective view showing the caster in a locked state. FIG. 7 is a perspective view of a caster according to a fifth embodiment. FIG. 7 is a perspective view showing a caster rotation stop mechanism and peripheral members thereof according to a fifth embodiment. FIG. 3 is a perspective view of a leaf spring pivotally supported by a rotation stop bar, seen from the swing cam side. (A) A side view of the caster according to the fifth embodiment in an unlocked state, and (B) a side view of the same in a locked state.

Embodiments of the present invention will be described below based on the accompanying drawings.

(First embodiment)
FIG. 1(A) is a schematic perspective view showing an example of a bed 100 to which casters 10 according to the first embodiment are applied, and FIG. 1(B) is a schematic perspective view showing an example of a trolley 200 to which casters 10 are applied.
As shown in FIG. 1A, the casters 10 according to the first embodiment are suitably used, for example, as legs 150 of a bed 100 such as a stretcher or a medical bed. Furthermore, the casters 10 may be used in a trolley 200 for transporting luggage, people, animals, equipment, etc., as shown in FIG. 1(B).

Further, FIG. 2(A) is a schematic perspective view showing an example of a rack 300 to which the casters 10 are applied, and FIG. 2(B) is a schematic perspective view showing an example of a bag with casters 400 to which the casters 10 according to the first embodiment are applied. It is a diagram.
The casters 10 are suitable for general equipment that may be moved, such as fixtures such as a rack 300 as shown in FIG. Applicable as legs for transportation. Furthermore, the casters 10 may be provided in a bag with casters 400, as shown in FIG. 2(B).
The material of the caster 10 is appropriately selected from among resin, metal, carbon, etc. depending on the load. A mounting base (not shown) is fixed to the legs 150 or the bottom of the conveyed objects such as the bed 100, the trolley 200, the rack 300, and the bag with casters 400, and the casters 10 are fixed to the legs 150 or the mounting base.

FIG. 3 is a perspective view of the caster 10 according to the first embodiment, looking down from the front side.
In FIG. 3, one of the wheels 14 is shown with imaginary lines in order to clearly show the structure of the back of the wheels 14.
The caster 10 according to the first embodiment mainly includes an insertion tube 11, a shaft case 12, a shaft 13, a wheel 14, and a stopper mechanism 15, as shown in FIG.
The caster 10 may be a single-wheel type caster in which one caster 10 is provided with one wheel 14, or may be a twin-wheel type caster in which two wheels 14 as shown in FIG. 3 are arranged side by side.
When the caster 10 is a twin-wheel type caster, the two wheels 14 are connected by the shaft 13 at the center of rotation thereof. The wheels 14 are fitted into wheel bearings 16 provided at both ends of the shaft 13, so that the wheels 14 rotate around the shaft 13. Note that the wheel 14 and the shaft 13 may be integrally molded during manufacturing, and the shaft 13 may be pivotally supported by the shaft case 12.

Hereinafter, for convenience of explanation, the direction in which the shaft 13 extends will be referred to as the "left-right" direction. Further, the direction perpendicular to the left-right direction and in which the casters 10 move due to the rotation of the wheels 14 is referred to as the "back-and-forth" direction. Further, a direction perpendicular to both the left-right direction and the front-back direction is referred to as the "up-down" direction. Further, when the wheels 14 are placed on the ground, the direction in which gravity is applied is called "down", and the opposite direction is called "up".

The shaft 13 is passed through an upper shaft case 12a that expands upward. The edge of the lower shaft case 12b, which expands downward, comes into contact with the edge of the upper shaft case 12a, and they are fixed to each other by screws. A protruding hole 25 is provided in a part of the contact side between the upper shaft case 12a and the lower shaft case 12b. A stopper plate 24, which constitutes a part of the stopper mechanism 15 housed in the shaft case 12, protrudes toward the wheel 14 from this protrusion hole 25.

The upper shaft case 12a is provided with a pivot hole at the upper front or rear part. An insertion tube 11, which is an example of a jig, is inserted into this shaft support hole, and is fixed to the shaft support hole so as to be able to pivot by an oscillating bearing 17. The insertion tube 11 is inserted into the leg 150 of the bed 100 from the lower end thereof, for example, and screwed to the leg 150 in a screw hole 11a provided in the body of the insertion tube 11.
In this way, the shaft case 12 movably connects the wheel 14 and the insertion tube 11, which is a jig, by supporting or fixing the jig and the shaft 13, respectively. Note that the swing bearing 17 and the wheel bearing 16 are not essential members. Depending on the type of caster 10, some casters 10 cannot be swung, while others have a mechanism that allows the wheels 14 to rotate without using wheel bearings 16.

Moreover, FIG. 4 is a perspective view showing the internal structure of the shaft case 12 from the caster 10 of FIG. 3, with the upper shaft case 12a removed.
In FIG. 4, the operating plate 18, the swinging bearing 17, the small diameter flange 20b, and the operating wire 21, which are an example of the operating mechanism, are shown with phantom lines in order to clearly show the connection relationship between the members.
5 is a perspective view of the caster 10 from FIG. 4, with the lower shaft case 12b removed, looking down from the side rear direction.
In FIG. 5, the peripheral members of the swing cam 19 and the peripheral members of the link member 23 are each taken out and shown in an enlarged manner. Further, in FIG. 5, the insertion tube 11 and its peripheral members, the operation plate 18, the operation wire 21, and the stopper plate 24, which is an example of a stopper member, are shown in imaginary lines.

As shown in FIG. 4 or 5, the insertion tube 11 has a shape in which three tube portions 11b to 11d are integrally formed, and the outer diameter decreases in three steps downward. The oscillating bearing 17 is fitted into the medium diameter cylindrical portion 11c. Further, a large-diameter flange 20a is fitted into the medium-diameter cylindrical portion 11c, and a small-diameter flange 20b is fitted into the small-diameter cylindrical portion 11d so as to sandwich the oscillating bearing 17 therebetween, and are fixed to the insertion tube 11, respectively.
Since the oscillating bearing 17 is pivotally supported on the insertion tube 11 in this way, the shaft 13 and the wheels 14, which are suspended by the shaft case 12 as described above, are attached to the insertion tube 11 so that they can pivot around the insertion tube 11. Pivotally supported.

An operating wire 21 is passed through the inner space 11e of the insertion tube 11, which is covered with an outer tube 21a and has a locking ball 26, which is an example of a locking body, at its lower end. The inner space 11e has two inner diameters, with the inner diameter decreasing one step at the mid-abdomen. By abutting the fixed washer 21b (FIG. 5) provided at the end of the outer tube 21a at this stepped portion of the inner diameter, the outer tube 21a is prevented from protruding into the shaft case 12 from the inner space 11e. .
On the other hand, the operating wire 21 also passes through the small diameter portion of the inner space 11e and protrudes from the end of the insertion tube 11 toward the inside of the shaft case 12.

Further, a swing cam 19 that is part of the stopper mechanism 15 is provided on the body of the shaft 13 .
The stopper mechanism 15 mainly includes, for example, the swing cam 19, an operation plate 18, a link member 23, a stopper plate 24, and a double torsion spring 27. The stopper mechanism 15 locks the wheel 14 by fitting the wheel lock tooth 24a into the wheel receiving tooth 28 by deforming a toggle structure described later with the operation plate 18.
A mount protrusion 19x for fixing the stopper mechanism 15 is formed on the cylindrical body of the swing cam 19.

One end of the operation plate 18 is fixed to this mount protrusion 19x. Further, a locking ball 26 is locked to the other end of the operation plate 18 on the free end side. An insertion hole 29 through which the locking ball 26 can be inserted, and a slit hole 29a extending from the insertion hole 29 toward the free end are provided in the center of the operation plate 18. After the locking ball 26 is inserted through the insertion hole 29 to the back side of the operation plate 18, the operation wire 21 is placed at the free end through the slit hole 29a, so that the locking ball 26 is inserted into the operation plate 18. Locked at the free end.

With this configuration, when the operating wire 21 is towed and the locking ball 26 is pulled upward, the operating plate 18 pivots around the fixed end on the mount protrusion 19x side while its free end is pulled up by the locking ball 26. Try to rotate and become horizontal. As the operation plate 18 rotates, the swing cam 19 that supports the operation plate 18 with play is pushed by the operation plate 18 and rotates in a direction to separate the mount protrusion 19x from the operation wire 21.
Note that this operation plate 18 is preferably, for example, a plate spring having an elastic force that pulls down the operation wire 21 in order to absorb errors in the pulling force of the operation wire 21. Furthermore, when the operation plate 18 has elastic force in the wire pulling direction, the force exerted by the operation plate 18 that pushes the swing cam 19 also becomes elastic force. Therefore, even if the peaks of the wheel lock teeth 24a and the wheel receiving teeth 28, which will be described later, are misaligned, pressure continues to be applied to the wheel locking teeth 24a to try to fit the wheel receiving teeth 28, so that the peaks become even smaller. When the wheel is shifted, the wheel receiving tooth 28 automatically fits into the wheel locking tooth 24a.

The description of the configuration of the stopper mechanism 15 will be continued.
The mount protrusion 19x is provided with a mount bar 31 that extends parallel to the shaft 13 and passes through the mount protrusion 19x from side to side. The link member 23 is pivotally supported by the mount bar 31 . The link member 23 has a ladder shape in which two base plates 32 are arranged parallel to each other with their plate surfaces facing each other and are coupled by a coupling plate 33. The end portions of the two base plates 32 are each pivotally supported by the mount bar 31, so that the link member 23 swings around the mount protrusion 19x. Further, a stopper bar 34 is bridged at the other ends of the two base plates 32. The stopper plate 24 is pivotally supported by the link member 23 by fitting the stopper bar 34 into the bracket 24b on the back surface of the stopper plate 24.

Further, one end side of the stopper plate 24 is pivotally supported on the shaft case 12 by a positioning support shaft 37. In other words, the back surface of the stopper plate 24 is pushed by the link member 23 and swings around a fixed point on the shaft case 12 .
The stopper plate 24 is provided with sawtooth-shaped wheel lock teeth 24a having a series of triangular shapes on the surface. The wheel lock tooth 24a meshes with a wheel receiving tooth 28 provided on the side surface of the wheel 39 of the wheel 14 on the shaft 13 side. The wheel receiving teeth 28 are provided around the circular curvature of the wheel 39 toward the rotation center A of the wheel 39 at the same pitch as the wheel lock teeth 24a.

Further, the cylindrical body of the swing cam 19 is provided with a restriction protrusion 41 that constitutes a rotation restriction mechanism 40 .
Here, FIG. 6 is an enlarged side view of the rotation limiting mechanism 40 and its surroundings in the first embodiment.
As shown in FIG. 6, a stop wall 42 is formed on the inner wall of the shaft case 12 and extends toward the swing cam 19 to a position where it does not contact the body of the swing cam 19. The restriction projection 41 and the stop wall 42 are arranged such that the restriction projection 41 comes into contact with the stop wall 42 when the link member 23 stands substantially upright in the radial direction from the shaft 13. Here, "substantially upright" means that the angle between the radial direction of the shaft 13 and the link member 23 is within +-10 degrees. In other words, the angle formed by the tangent of the shaft 13 at the point where the link member 23 makes contact with the link member 23 is within 90 degrees + -10 degrees. Specifically, "upright" means a state in which the center of swing of the swing cam 19 is on the straight line connecting the stopper bar 34 and the mount bar 31, as shown in FIG. 7(B). means. More preferably, the angle between the radial direction of the shaft 13 and the link member 23 is within +-5 degrees. In this way, the limiting protrusion 41 and the stop wall 42 act as a rotation limiting mechanism 40 that stops the rotation of the mount protrusion 19x when it rotates to a specific angle and defines the position of the mount protrusion 19x when the wheel 14 is locked. Function.

Note that it is desirable that both the wheel lock tooth 24a and the wheel receiving tooth 28 have a shape that is not a rectangle but a series of triangles. With rectangular teeth, if the widths of adjacent teeth are exactly the same, they will collide with the sides of the teeth that are trying to fit in from an oblique direction, and will not be able to mesh. Therefore, in the case of rectangular teeth, it is necessary to make the interval between adjacent teeth wider than the width of the teeth in each of the wheel lock teeth 24a and the wheel receiving teeth 28. As a result, caster products using rectangular teeth have a slight gap between the teeth when they are engaged, which causes the wheels to rotate slightly back and forth even after locking, giving the user a feeling of wobbling. give.
On the other hand, when the tooth profile is triangular, it is possible to create a design in which there is no gap when the teeth 24a and 28 are engaged with each other, so that rattling after locking can be prevented.

Note that a double torsion spring 27 is further provided in the body of the swing cam 19. The wire constituting the double torsion spring 27 is wound around one of the right and left body parts of the swing cam 19, and then passed through the side surface of the mount protrusion 19x on the limiting protrusion 41 side and wound around the other body part. Both ends of the wire of the double torsion spring 27 are hung on the inner wall of the shaft case 12, respectively.
The double torsion spring 27 assumes its natural shape when the locking ball 26 is pulled down. Therefore, when the locking ball 26 is pulled up and the mount protrusion 19x is released toward the operating wire 21 side, a spring force is applied in the direction of pulling down the locking ball 26 and drawing the mount protrusion 19x toward the operating wire 21 side. Ru.

Next, the toggle structure of the stopper mechanism 15 and its modified form will be described using FIGS. 7(A) and 7(B).
FIG. 7(A) is a diagram showing the stopper mechanism 15 in an unlocked state, and FIG. 7(B) is a diagram showing the stopper mechanism 15 in a locked state.

The toggle structure is a type of link structure composed of two link axes and one slider. The toggle structure is a link structure in which the link shaft moves in the input direction in response to an input, and the output is increased by a booster structure.
In the caster 10 according to the first embodiment, the mount bar 31 corresponds to the link shaft that receives input, the link shaft whose fixed point is the rotation center A of the swing cam 19, and the stopper bar 34 correspond to the slider. Furthermore, since one end side of the stopper plate 24 is pivotally supported on the shaft case 12 by the positioning support shaft 37, the stopper bar 34 is limited to sliding only on the circular arc H with the positioning support shaft 37 as the center of rotation A. imposed.

Therefore, the link member 23 is only displaced in such a manner that the stopper bar 34 is located on the arc H. Due to this restriction, when the mount bar 31 attempts to rotate away from the operating wire 21, the link member 23 gradually rises in the radial direction of the shaft 13. Then, the stopper bar 34 moves toward the wheel lock teeth 24a.

Then, when the wheel receiving tooth 28 is fitted into the wheel locking tooth 24a, the limiting protrusion 41 abuts against the stop wall 42, and the rotation of the swing cam 19 is stopped. Here, as the limiting protrusion 41 approaches the stop wall 42, the rotation center A, the mount bar 31, and the stopper bar 34 come closer to being aligned in a straight line, and a large pushing force is applied to the stopper bar 34 due to the boosting structure. That is, as the rotation center A, the mount bar 31, and the stopper bar 34 approach alignment, the force with which the stopper bar 34 presses the wheel lock tooth 24a of the stopper plate 24 against the wheel receiving tooth 28 increases rapidly. Therefore, a large locking force can be generated with a small pulling force of the operating wire 21 via the operating plate 18. Then, when the wheel receiving tooth 28 fits into the wheel lock tooth 24a, the wheel 14 is in a locked state.

Further, when the wheel 14 is in the locked state, the link member 23 and the stopper plate 24 are arranged at approximately right angles, as shown in FIG. 7(B). Here, "substantially right angle" refers to a right angle within +-10 degrees. In other words, the angle between the link member 23 and the stopper plate 24 is in the range of 80 degrees to 90 degrees. This approximately right angle is more preferably within +-5 degrees of the right angle. At this time, since the stopper bar 34 is movable only on the arc H, the force that the link member 23 receives from the stopper plate 24 is directed from the apex of the link member 23 toward the center of gravity of the link member 23 and the rotation center A of the shaft 13. Therefore, the link member 23 standing upright from the shaft 13 can maintain a pressing force on the stopper plate 24 without falling toward the operating wire 21 in response to an external force generated when the wheel 14 attempts to rotate. In other words, the locked state of the wheel 14 is maintained as long as the operating wire 21 is pulled up and the operating plate 18 pushes the mount protrusion 19x to bring the limiting protrusion 41 into contact with the stop wall 42. As a result, once the wheel 14 is in the locked state, the stopper plate 24 has a resistance force against the force that tries to rotate in the direction to release the lock even if the traction force of the operating wire 21 is not applied. Therefore, no extra force is required to hold the stopper plate 24, so it can be operated with light force.

Note that the link member 23 does not necessarily have to stand completely upright on the swing cam 19 in the radial direction of the shaft 13. In other words, even if the design is such that the wheel receiving tooth 28 fits into the wheel lock tooth 24a at an angle where the rise of the link member 23 is smaller than a right angle, the link member 23 will move clockwise or counterclockwise depending on the reaction force received from the stopper plate 24. It is possible to stably maintain the stopper plate 24 in a locked state without rotating in any direction. Further, even at this time, the link member 23 can press the stopper plate 24 against the wheel receiving tooth 28 with the increased pressing force due to the boosting structure.

Further, the mount protrusion 19x receives a force that pushes back the operation plate 18 toward the operation wire 21 side by a double torsion spring 27 that is a push-back mechanism. Therefore, when the pulling force of the operating wire 21 disappears and the pushing force of the operating plate 18 disappears, the swing cam 19 rotates together with the mount protrusion 19x in the lock position, and the lock is released. Note that the push-back mechanism for pushing back the mount protrusion 19x to the unlocked state position is not limited to the double torsion spring 27 as long as it is an elastic member that pushes back the mount protrusion 19x elastically. For example, the push-back mechanism may be a single torsion spring that has one end fixed through the mount protrusion 19x and the other end fixed to the inner wall of the shaft case 12. Further, the push-back mechanism may be a coil spring or a plate spring that has one end fixed to the inner wall of the shaft case 12 and the other end abutted against the mount protrusion 19x.

In addition, in the stopper mechanism 15 having such a structure, the displacement length of the locking ball 26 when locking the wheel 14, that is, the pulling distance of the operating wire 21, is determined by the stopper plate as shown in FIGS. 7(A) and (B). It can be designed to be greater than 24 rotation distances. That is, in order to fit the wheel lock tooth 24a into the wheel receiving tooth 28, the operating wire 21 can be designed to be pulled by a distance longer than the displacement distance of the stopper bar 34. Therefore, due to the lever principle, it is possible to pull the operating wire 21 and lock the wheel 14 with an even lighter force.
Further, since the stopper mechanism 15 operates with extremely light force in this manner, it is possible to prevent the generation of large collision noises due to locking or unlocking operations as in the prior art.

Note that the operation of the operation plate 18 is not limited to operation using the operation wire 21. For example, a rod structure may be used in which the operation plate 18 is made to protrude outside the shaft case 12 and the swing cam 19 is rotated by stepping on the operation plate 18 with a foot.
Furthermore, although an example has been described in which the swing cam 19 is provided on the shaft 13 and rotates around the shaft 13, the swing cam 19 does not need to be provided on the shaft 13. That is, the stopper mechanism 15 including the toggle structure may be provided on a shaft that is bridged within the shaft case 12, separately from the shaft 13. Further, in FIGS. 7A and 7B, the toggle structure portion of the stopper mechanism 15 is depicted at a position inclined by 45 degrees from the horizontal, but the angle at which the toggle structure portion is arranged with respect to the ground is not particularly limited.

As described above, according to the first embodiment, by configuring the stopper mechanism 15 of the caster 10 with a toggle structure, the caster 10 can be reliably locked and unlocked with a light force.
Further, by using the wheel lock teeth 24a and the wheel receiving teeth 28, rattling of the caster 10 in the locked state can be suppressed.

(Second embodiment)
FIG. 8(A) is a perspective view showing a stopper mechanism 15A in the second embodiment.
Moreover, FIG. 8(B) is a perspective view showing a stopper mechanism 15B according to a modification of the second embodiment.
In addition, in order to clearly show the difference from the first embodiment, illustrations of the stopper plate 24 and the operation plate 18 that constitute the stopper mechanism 15A are omitted in FIGS. 8(A) and 8(B).

In the second embodiment, limiting protrusions 41A provided on the swing cam 19A as the rotation limiting mechanism 40A are provided on the left and right two side surfaces of the mount protrusion 19Ax, as shown in FIG. 8(A).
In the first embodiment, the limiting protrusion 41A is provided so as to come into contact with a stop wall 42 provided on the shaft case 12 in order to limit the rotation of the swing cam 19A.
However, the deformation of the stopper mechanism 15 can also be stopped by limiting the deformation of the link member 23 relative to the swing cam 19A.

Therefore, in the second embodiment, the limiting protrusion 41A is made to protrude from the mount protrusion 19Ax in the left-right direction. The limiting protrusion 41A locks the wheel 14, and as shown in FIGS. The link member 23 is designed to abut against the left and right base plates 32 of the link member 23 when the link member 23 is in the facing state. Since the link member 23 in contact with the limiting protrusion 41A does not rotate any further, the stopper plate 24 whose orbit is limited to the circular arc H is also fixed. Therefore, forward rotation of the swing cam 19A around the shaft 13 is also stopped. That is, the deformation of the entire toggle structure of the stopper mechanism 15A is stopped.

Note that the structure in which the rotation of the link member 23A is limited by the swing cam 19A is not limited to the structure using the limiting protrusion 41A as shown in FIG. 8(A).
For example, as shown in FIG. 8(B), a groove 19By may be formed in the mount protrusion 19Ax, and the link member 23A formed of one base rod 32a may be fitted into the groove 19By. The link member 23A fitted into the groove 19By is swingably supported by a mount bar 31 that passes through the groove 19By in the left-right direction. The shape of the groove 19By is designed so that when the stopper plate 24 locks the wheel 14, the inner surface 19By1 of the groove 19By just contacts the link member 23A . By stopping the rotation of the link member 23A at a predetermined position using the inner surface 19By1 of the groove portion 19By in this manner, the deformation of the toggle structure can be stopped at a predetermined posture without using the limiting protrusion 41A.

Note that the caster 10 according to the second embodiment has the same configuration and functions as the first embodiment except for the above-mentioned configuration, so a duplicate explanation will be omitted. Also, in the drawings, overlapping structures are omitted from illustration or given the same reference numerals and their explanations are omitted.
As described above, according to the caster 10 according to the second embodiment, the same effects as in the first embodiment can be achieved with the stopper mechanisms 15A and 15B having different arrangement shapes.

(Third embodiment)
FIG. 9 is a perspective view of caster 10A according to the third embodiment. In FIG. 9, the caster 10A is shown with the shaft case 12, one wheel 14, and wheel bearing 16 removed.
Moreover, FIGS. 10(A) and 10(B) are side views of the caster 10A of FIG. 9. FIG. 10(A) shows a state in which the wheels 14 are unlocked. Moreover, FIG. 10(B) shows a state in which the wheels 14 are locked. Note that the eccentric cam 58, pedal 59, and rod 60 are not shown in FIGS. 10(A) and 10(B).

As shown in FIG. 9, the caster 10A according to the third embodiment differs from the first embodiment in that the stopper mechanism 15C is provided at a plurality of locations. In the third embodiment, first, the operation plate 18A is separated from the mount protrusion 19Cx and integrated with the swing cam 19C. With such a shape, the starting point of the operation plate 18A is not limited to the mount protrusion 19Bx, so the degree of freedom in designing the stopper mechanism 15C is improved.

Further, in the third embodiment, the direction of rotation for locking the swing cam 19C is opposite to that in the first embodiment. A spring locking protrusion 47 that locks the coil spring 27a is provided on the lower surface of the operating plate 18A of the swing cam 19C. The coil spring 27a is provided in place of the double torsion spring 27. The upper end of the coil spring 27a of the first embodiment is locked to the spring locking protrusion 47 (FIGS. 10(A) and 10(B)), and the lower end is supported by the wall surface of the shaft case 12, and the coil spring 27a is connected to the operation plate. Push 18A upward. Further, a push-down rod 48 is brought into contact with the upper surface of the operation plate 18A.

The push-down rod 48 is a hard rod that operates the operation plate 18A instead of the locking ball 26 of the first embodiment. The push-down rod 48 passes through the plate connecting tube 46 which is a modified version of the insertion tube 11 (FIG. 4, etc.) and projects to the upper part of the plate connecting tube 46 . The upper end of the push-down rod 48 is brought into contact with the peripheral side surface of the eccentric cam 58 . A rod 60 having a pedal 59 is connected to the eccentric rotation center of the eccentric cam 58. When the operator depresses this pedal 59, the eccentric cam 58 rotates together with the rod 60. As the eccentric cam 58 rotates, the push-down rod 48 is pushed down by the peripheral side surface of the eccentric cam 58. Note that the rotation operation of the rod 60 is not limited to the depression of the pedal 59, but may be performed by hand or the like.

When locked, the push-down rod 48 pushes down the operation plate 18A against the push-up force of the coil spring 27a, as shown in FIGS. 10(A) and 10(B). By pushing down the operation plate 18, the swing cam 19C rotates in a direction opposite to that of the first embodiment, that is, so as to bring the mount protrusion 19Bx closer to the operation wire 21 side. Then, when the limiting protrusion 41 contacts the shaft case 12 after the mount protrusion 19Bx rotates toward the operating wire 21, the rotation center A of the wheel 39, the mount bar 31, and the stopper bar 34 are arranged on a straight line, and the stopper plate 24X is strongly pressed against the wheel 39.

Further, in the third embodiment, the wheel lock tooth 24a and the wheel receiving tooth 28 shown in the first embodiment are not provided on the wheel 39 and the stopper plate 24X, respectively. The stopper plate 24X is provided with a friction member 49 made of rubber, for example, in place of the wheel lock teeth 24a. In the third embodiment, the stopper plate 24X stops the rotation of the wheel 39 due to the friction generated when the friction member 49 strongly contacts the inner curved surface of the wheel 39.

Further, in the third embodiment, the movement of the stopper plate 24X is restricted by the protrusion hole 25 of the shaft case 12a (see FIGS. 3 and 10(A) and (B)) instead of the positioning support shaft 37. That is, by devising the shape of the protruding hole 25, the movement of the stopper plate 24X can be restricted without restricting the movement of the stopper plate 24X with the positioning support shaft 37. For example, by making the protrusion hole 25 into a slit shape, the movement of the stopper plate 24X can be regulated by the peripheral edge of the protrusion hole 25, and can be restricted to rectilinear movement along the slit shape. Therefore, even in the stopper mechanism 15C of the third embodiment that does not include the positioning support shaft 37, a toggle structure can be formed similarly to the first embodiment and the like.

Further, in the third embodiment, the jig for attaching the casters 10A to the objects to be transported (100 to 400) is a fixing plate 51 instead of the insertion tube 11 shown in the first embodiment. The insertion tube 11 is modified to grip the push-down rod 48 and is replaced by the above-mentioned plate connection tube 46 in which the large diameter tube portion 11b is shortened. The large-diameter cylinder portion 11b of the plate connecting tube 46 is connected to the fixing plate 51, and is fixed to the object to be transported via the fixing plate 51. For example, when the bottom of the cart 200, rack 300, or bag with casters 400 does not have the legs 150 into which the insertion tube 11 is inserted and has a flat bottom, the fixing plate 51 is used to fix the casters 10A to the bottom. It is preferable to do so. The fixing plate 51 is fixed to the bottom with screws, for example, through screw holes 52 provided in the fixing plate 51.

Note that, other than the above-described structure, the third embodiment has the same configuration and functions as the first embodiment, so redundant explanation will be omitted. Also, in the drawings, overlapping configurations are designated by the same reference numerals and their explanations will be omitted.
As described above, according to the caster 10A according to the third embodiment, even if the stopper mechanism 15C has a different modification of the toggle structure from the first embodiment, it is possible to achieve the same effects as the first embodiment. Further, by using the fixing plate 51, the caster 10A can be directly fixed to the bottom of the transported object 200, 300, 400.

(Fourth embodiment)
FIG. 11 is a perspective view showing a rotation stop mechanism 44A of a caster 10B and its peripheral members according to the fourth embodiment. FIG. 11 shows a state in which the swing rotation is locked.
Moreover, FIG. 12 is a partially enlarged sectional view showing a cross section of the caster 10B according to the fourth embodiment, cut horizontally at the height of the toothed ring 20c. In FIG. 12, illustration of the wheels 14 and wheel bearings 16 is omitted. Further, in FIG. 12, dots are placed on the fitting member 45 from the viewpoint of ease of viewing the shapes of each structure.

As shown in FIGS. 11 and 12, the caster 10B according to the fourth embodiment includes a rotation stop mechanism 44A that simultaneously locks the swinging rotation of the shaft case 12 relative to the insertion tube 11 when the wheels 14 are locked.
The rotation stop mechanism 44A is, for example, fitted with a gear-shaped toothed ring 20c provided at the lower end of the insertion tube 11 and provided with teeth outward at a constant pitch around the outer circumference, and the toothed ring 20c. and a fitting member 45 that locks the swinging rotation of the caster 10B around the insertion tube 11. The toothed ring 20c is fixed to the insertion tube 11 instead of, for example, the small diameter flange 20b (FIG. 4). The locking ball 26 of the operating wire 21 is indirectly locked to the operating plate 18B via the fitting member 45.
Further, the operation plate 18B has a bifurcated portion 43 that branches from the center toward the free end.

As shown in FIGS. 11 and 12, the fitting member 45 has a shape in which a toothed flange 45b is formed at the top of a cylindrical body portion 45a. Fitting teeth 45c that can fit into the teeth of the toothed ring 20c are provided on the upper surface of the toothed flange 45b. Further, two arm portions 45d protrude from the body portion 45a in opposite directions.

A bent portion at the tip of the bifurcated portion 43 of the operation plate 18B sandwiching the body portion 45a is engaged with the shoulder portion of each arm portion 45d. Furthermore, a guide protrusion 45e is formed on the circumferential side surface of the toothed flange 45b. The guide protrusion 45e fits into a guide rail 61 provided along the vertical direction from the upper shaft case 12a to the lower shaft case 12b, and slides along the guide rail 61. When the shaft case 12 rotates by fitting the guide protrusion 45e into the guide rail 61, the fitting member 45 rotates together with the shaft case 12 relative to the insertion tube 11 and the toothed ring 20c.

When the operating wire 21 is pulled, the fitting member 45 locked to the locking ball 26 is pulled up, and the operating plate 18B locked to the arm 45d is pulled up. As a result of this pulling up, the wheel receiving teeth 28 of the stopper plate 24 fit into the wheel locking teeth 24a of the wheel 39, and the wheel 14 is locked, as in the first embodiment.

Further, by pulling up the locking ball 26, the fitting member 45 is pulled up, and the fitting teeth 45c of the toothed flange 45b fit into the teeth of the toothed ring 20c. As described in the first embodiment, since the shaft case 12 is pivotally supported by the insertion tube 11 via the oscillating bearing 17, the caster 10B oscillates around the insertion tube 11. However, when the fitting member 45 is fixed to the toothed ring 20c fixed to the insertion tube 11, the shaft 13 is fixed to the insertion tube 11 by the guide protrusion 45e and the guide rail 61. Note that if the fitting member 45 and the shaft case 12 have a structure in which they rotate around the insertion tube 11 in conjunction with each other as described above, the swinging of the caster 10B can be performed using the toothed ring 20c and the fitting member 45. Rotation can be stopped. Therefore, the engagement relationship between the fitting member 45 and the shaft case 12 is not limited to the example of the guide protrusion 45e and the guide rail 61 described above.
When the locking ball 26 is pulled up in this way, the wheels 14 are locked and the swinging rotation of the caster 10B relative to the insertion tube 11 is locked.

Note that when the pulling of the operating wire 21 is released, the fitting member 45 that has been pulled up descends due to the pulling force of the double torsion spring 27 (FIGS. 10(A) and 10(B)) and its own weight applied to the operating plate 18B. As a result, the wheel 14 is unlocked, and the toothed ring 20c and the fitting teeth 45c are disengaged from each other, and the oscillation is also unlocked.

Moreover, FIGS. 13(A) and 13(B) are perspective views showing a caster 10C according to a modification of the fourth embodiment.
In the rotation stop mechanism 44B of the caster 10C according to the modified example, the operation plate 18C also has the function of the fitting member 45.
The operation plate 18C has a stepped shape in which the plate surface of the operation plate 18 of the first embodiment is bent twice at right angles into a mountain fold and a valley fold. For convenience, among the surfaces formed by bending in this way, the surface on which the locking ball 26 is locked is referred to as the locking surface _18C1 .
In addition, for example, two protruding pieces 18x are formed on the locking surface _18C1 of the operation plate 18C to bend and protrude toward the toothed ring 20c. This protruding piece 18x has a shape that can be fitted into the toothed ring 20c.

In such a configuration, when the wheel 14 is unlocked as _shown in FIG. It is leaning due to the traction force of 10 (A), (B)) and its own weight. At this time, the protruding piece 18x and the toothed ring 20c are not engaged with each other.
On the other hand, when the wheel 14 is in the locked state as shown in FIG. 13(B), it is pulled up by the locking ball 26, the locking surface _18C1 comes into contact with the toothed ring 20c, and the protruding piece 18x fits into the toothed ring 20c. Get stuck in.
In this way, in the rotation stop mechanism 44B according to the modified example, the operation plate 18C has the function of the fitting member 45 in addition to the function of the operation plate 18 of the first embodiment.

Note that the fourth embodiment has the same configuration and functions as the first embodiment except for the provision of a mechanism for locking the swinging rotation, and therefore, redundant explanation will be omitted. Also, in the drawings, overlapping configurations are designated by the same reference numerals and their explanations will be omitted.

As described above, according to the casters 10B and 10C according to the fourth embodiment, in addition to the effects of the first embodiment, it is possible to lock the wheels 14 and simultaneously lock the oscillation of the casters 10B and 10C.

(Fifth embodiment)
FIG. 14 is a perspective view of a caster 10D according to the fifth embodiment. In FIG. 14, one wheel 14, wheel bearing 16, and shaft case 12 are excluded to clearly show the internal structure. Further, FIG. 14 shows a state in which both the rotation and swinging of the wheel 14 are locked.
Moreover, FIG. 15 is a perspective view showing the rotation stop mechanism 44C of the caster 10D and its peripheral members according to the fifth embodiment.

As shown in FIGS. 14 and 15, the caster 10D according to the fifth embodiment includes a rotation stop mechanism 44C that is a modification of the rotation stop mechanism 44 shown in the fourth embodiment. The rotation stop mechanism 44C includes a rotation stop piece 54 that is pivotally supported on the upper shaft case 12a by a rotation stop bar 53. As shown in FIG. 15, the rotation stop piece 54 has a leaf spring 55 and a rotation stop rocker 56 stacked on top of each other, both of which are pivotably supported by the rotation stop bar 53.

Here, FIG. 16 is a perspective view of the leaf spring 55 pivotally supported by the rotation stop bar 53, viewed from the swing cam 19D side. As shown in FIG. 16, the leaf spring 55 is, for example, a metal or resin flat plate lathed into a generally rectangular shape and then bent. Two slits are formed along the front-rear direction in the rear edge of the four sides of the flat plate, thereby forming two left and right restoring plates 55a and a central pushing plate 55c. Furthermore, on the front edge of the four sides of the flat plate, two left and right release pins 55d and a central push-up plate 55b are formed along the front-rear direction. The two left and right release pins 55d are bent upward at an angle of about 45 degrees from the base. In addition, locking ears 55e each having a punched hole are provided on the left and right two sides of the four sides of the flat plate. This locking ear 55e is bent toward the opposite side to the bending direction of the release pin 55d, that is, toward the bottom. The leaf spring 55 is pivotally supported by the rotation stop bar 53 by inserting one rotation stop bar 53 into the opposing left and right punch holes by bending the locking ears 55e.

The leaf spring 55 has a function of swinging the rotation stop rocker 56 when the swing rotation is locked and when the lock is released. The leaf spring 55 swings while being spring-deformed by an operating protrusion 57 provided on the stopper plate 24Y. The operation protrusion 57 is provided at a position supported by the positioning support shaft 37, and is brought into contact with the pushing plate 55c of the leaf spring 55. The tip of the release pin 55d is in contact with the inner surface of the upper shaft cover 12a. When the pushing plate 55c of the leaf spring 55 is pushed by the operation protrusion 57 and tries to swing while being spring-deformed, the release pin 55d is pressed against the inner surface of the upper shaft cover 12a and spring-deformed. Due to this spring deformation of the release pin 55d, the leaf spring 55 receives elastic resistance from the inner surface of the upper shaft cover 12a. The release pin 55d is always pressed against the shaft cover 12a to prevent it from being unexpectedly locked due to vibrations or the like during driving.

Further, the rotation stop rocker 56 has substantially the same shape as the leaf spring 55. However, no plates are provided at the locations overlapping the left and right release pins 55d and the push-in plates 55c. That is, when the rotation stop piece 54 in which the rotation stop rocker 56 and the leaf spring 55 are stacked together is viewed from the top side of the rotation stop rocker 56, the left and right release pins can be seen as shown in FIGS. 14 and 15. 55d and the push-in plate 55c are exposed from the rotation stop rocker 56. The rotation stop rocker 56 is made of a plate made of steel, for example, and is thicker and more rigid than the plate spring 55. A portion of the rotation stop rocker 56 that overlaps the push-up plate 55b of the leaf spring 55 becomes a lock pin 56a that is pushed up by the push-up plate 55b during a locking operation and fits between the teeth of the toothed ring 20c. By fitting the lock pin 56a into the toothed ring 20c, the rotation of the upper shaft case 12a, which pivotally supports the rotation stop piece 54 via the rotation stop bar 53, with respect to the toothed ring 20c is stopped.

Here, FIGS. 17(A) and 17(B) are side views of the caster 10D of FIG. 14. FIG. 17(A) shows a state in which the wheels 14 are unlocked. Moreover, FIG. 17(B) shows a state in which the wheels 14 are locked.
Due to the above-described configuration of the stopper mechanism 15D, when the stopper plate 24Y rotates in a direction to fit into the wheel lock teeth 24a, as shown in FIGS. The plate 55c is pushed downward. The leaf spring 55 with the push plate 55c pushed downward rotates around the rotation stop bar 53. Here, the release pin 55d is designed to be thinner and longer than other parts of the leaf spring 55, such as the pushing plate 55c, in order to reduce the rigidity of the release pin 55d. Therefore, even if the release pin 55 receives resistance from the upper shaft cover 12a as described above, the leaf spring 55 as a whole rotates in the direction in which the push plate 55c is pushed.

In other words, when the push-in plate 55c is pushed in, the leaf spring 55 deforms the release pin 55d to a greater extent, thereby rotating the leaf spring 55 as a whole and causing the rotation stop rocker 56 to rotate. Then, the leaf spring 55 pushes up the tip of the lock pin 56a of the rotation stop rocker 56 and causes it to fit into the teeth of the toothed ring 20c.
Therefore, in the fifth embodiment as well, when the wheels 14 are locked, the turning of the casters 10D is also locked.

Note that even if the lock pin 56a is pushed up by the leaf spring 55, the tip of the lock pin 56a may hit the teeth of the toothed ring 20c and may not fit between the teeth. At this time, if the operation protrusion 57 of the stopper plate 24Y is in direct contact with the rotation stop rocker 56 without using the plate spring 55, the rotation stop rocker 56 will inhibit the rotation of the stopper plate 24Y. You end up doing it. That is, if the tip of the lock pin 56a does not fit between the teeth of the toothed ring 20c, the rotation of the stopper plate 24Y may become insufficient and the wheel 14 may not be locked. However, in the fifth embodiment, since the operating protrusion 57 is in contact with the leaf spring 55, if the tip of the lock pin 56a hits the teeth of the toothed ring 20c and does not fit between the teeth, Also, by deforming the leaf spring 55, the stopper plate 24Y can be rotated by an amount sufficient to lock the wheel 14. In other words, the leaf spring 55 has the function of absorbing the difference in rotation to reliably lock the wheel 14 by absorbing the insufficient rotation of the rotation stop rocker 56 that occurs when the lock pin 56a collides with the toothed ring 20c.

In addition, by applying an upward elastic force to the tip of the lock pin 56a using the leaf spring 55, when the lock pin 56a moves from a position where it does not engage with the toothed ring 20c to a position where it engages with the toothed ring 20c, the lock pin The tip of 56a fits between the teeth by this elastic force.

Note that when the lock is released, the leaf spring 55 attempts to reversely rotate in the direction in which the push-up plate 55b comes off from the toothed ring 20c due to the restoring force of the release pin 55d that has been pressed against the shaft cover 12a and deformed. At this time, being pushed by the restoring plate 55a of the leaf spring 55, the rotation stop rocker 56 also rotates together with the leaf spring 55. Therefore, the turning stop piece 54 rotates in the opposite direction in such a direction that the lock pin 56a is removed from the toothed ring 20c, and returns to the predetermined unlocked position.

Note that the function of the release pin 55d can also be achieved in a form other than the above-described release pin 55d. For example, a double torsion spring or a compression spring that is a separate member from the leaf spring 55 may be used. Furthermore, the leaf spring 55 can be substituted by combining a double torsion spring or a compression spring.

Note that, as shown in FIGS. 14 and 15, the wheel lock teeth 24a may be provided only on a part of the stopper plate 24Y instead of over the entire surface thereof.
Furthermore, when it is desired to shorten the pulling distance of the operating wire 21, it is desirable to make the mount protrusion 19Cx provided on the swing cam 19D as high as possible, as shown in FIG. By increasing the height of the mount protrusion 19Cx, the toggle structure can be largely deformed with a short pulling distance of the operating wire 21. For example, the height of the mount protrusion 19Cx is at least twice the length of the link member 23 in the longitudinal direction, and more preferably at least three times the length of the link member 23 in the longitudinal direction. By shortening the pulling distance of the operating wire 21, the amount of operation of the operating wire 21 can be reduced, so that the operating unit (not shown) for operating the operating wire 21 can be downsized.

Note that, other than the above-mentioned configuration, the fifth embodiment has the same configuration and functions as the fourth embodiment, etc., and therefore, redundant explanation will be omitted. Also, in the drawings, overlapping configurations are designated by the same reference numerals and their explanations will be omitted.

As described above, according to the caster 10D according to the fifth embodiment, the same effects as the fourth embodiment can be achieved with a configuration different from that of the fourth embodiment.

Although several embodiments of the invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention.
These embodiments can be implemented in various other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the gist of the invention.
These embodiments and their modifications are included within the scope and gist of the invention as well as within the scope of the invention described in the claims and its equivalents.

For example, an example has been described in which the jig and the shaft are connected so as to be able to swing and turn using a caster case, but the jig and the shaft may be connected by a method that does not use the caster case.
Further, in the embodiment, an example in which the swing cam swings around the shaft has been described, but the swing center of the swing cam is not limited to the shaft, and can be freely designed as long as the toggle structure can be configured to be deformable.

Further, in the embodiment, the operation mechanism has been described using an example of an operation plate, but its form is not particularly limited as long as the swing cam can be swung. In particular, when the swing cam is disposed close to an external operating means such as an operating wire, the swing cam can be operated without extending the operating plate from the swing cam. For example, a small protrusion provided on the swing cam may function as an operating mechanism. Alternatively, an operation wire may be connected to the mount projection by passing through it, and the mount projection may be directly pulled and operated by the operation wire. Furthermore, the rocking cam may be operated by providing a groove for locking the locking ball in the body of the rocking cam and directly connecting an operating wire to the body, without providing the protrusion.

10 (10A to 10D)...Casters, 11 (11a to 11e)...Insertion cylinder (jig), 11a...Screw hole, 11b...Large diameter cylinder part, 11c...Medium diameter cylinder part, 11d...Small diameter cylinder part, 11e... Inner space, 12 (12a, 12b)...Shaft case (upper shaft case, lower shaft case), 13...Shaft, 14...Wheel, 15 (15A to 15D)...Stopper mechanism, 16...Wheel bearing, 17...For swinging Bearing, 18 (18A to 18C)...Operation plate (operation mechanism), 18C ₁ (18C)...Locking surface, 18x (18)...Protrusion piece, 19 (19A to 19D)...Rocking cam, 19x (19Ax to 19Cx) )...Mount projection, 19By...Groove, 19By ₁ ...Back surface of groove, 20a...Large diameter flange, 20b...Small diameter flange, 20c...Toothed ring, 21...Operation wire, 21a...Outer tube, 21b...Fixing washer, 23 (23A)... Link member, 24 (24X, 24Y)... Stopper plate (stopper member), 24a... Wheel lock tooth, 24b... Bracket, 25... Projection hole, 26... Locking ball (locking body), 27 (27a)... )...Elastic member (double torsion spring, coil spring), 28...Wheel bearing tooth, 29...Insertion hole, 29a...Slit hole, 31...Mount bar, 32...Base plate, 32a...Base rod, 33...Joining plate, 34 ...stopper bar, 37...positioning support shaft, 39...wheel, 40 (40A)...rotation limiting mechanism, 41 (41A)...limiting protrusion, 42...stop wall, 43...bifurcated portion, 44 (44A to 44C)...rotation stop Mechanism, 45 (45a to 45d)...Fitting member, 45a...Body portion, 45b...Toothed flange, 45c...Fitting tooth, 45d...Arm portion, 45e...Guide protrusion, 46...Plate connection tube, 47...Spring engagement Stop projection, 48... Push-down rod, 49... Friction member, 51... Fixed plate, 52... Screw hole, 53... Turn stop bar, 54... Turn stop piece, 55 (55a to 55e)... Leaf spring, 55a... Restoration plate, 55b... Push-up plate, 55c... Push-in plate, 55d... Release pin, 55e... Locking ear, 56... Turn stop rocker, 56a... Lock pin, 57... Operation protrusion, 58... Eccentric cam, 59... Pedal, 60... , rod, 61...guide rail, 100...bed, 150...leg, 200...truck, 300...rack, 400...bag with casters, A...rotation center, H...circular arc.

Claims (13)

A jig fixed to the transported object,
A wheel with a shaft connected to the center of rotation,
a shaft case that pivotally supports the wheel and the jig, respectively, and connects the wheel and the jig;
a stopper member that can come into contact with the wheel of the wheel;
a stopper mechanism having a toggle structure including the stopper member;
an operation mechanism that stops the rotation of the wheel by bringing the stopper member into contact with the wheel by deforming the toggle structure,
The stopper mechanism is configured such that when the two link shafts of the toggle structure are lined up in a straight line, a straight line and the stopper member are at a substantially right angle, and the stopper member is pressed against the wheel at a substantially right angle. A caster featuring: The caster according to claim 1, further comprising a rotation stopping mechanism that simultaneously locks rotation of the shaft case with respect to the jig when the stopper member contacts the wheel to stop the rotation. The caster according to claim 1, wherein the operating mechanism is operated by a locking body connected to a wire. The caster according to claim 1, wherein the operating mechanism is operated by a rod protruding from the shaft case. wheel lock teeth provided on a contact surface of the stopper member with the wheel;
a wheel receiving tooth provided on the wheel and with which the wheel lock tooth meshes;
The caster according to claim 1, wherein the wheel lock tooth and the wheel receiving tooth each have a triangular shape extending along a curvature of the circumference of the wheel. The stopper mechanism is
a swinging cam provided in the shaft case and swinging when pushed by the operating mechanism;
a link member having one end pivotally supported by the swing cam,
The caster according to claim 1, wherein the stopper member is pivotally supported at one end of the link member opposite to the swing cam, and one end is pivotally supported by the shaft case. The caster according to claim 6, wherein the swing cam is pivotally supported by the shaft. The caster according to claim 1, wherein the caster is a twin-wheel type caster. The caster according to claim 1, wherein the caster is a single-wheel type caster. a limiting mechanism that limits deformation of the toggle structure;
The caster according to claim 1, further comprising an elastic member that eliminates deformation of the toggle structure when unlocking the wheel. The caster according to claim 1, wherein the shaft case movably connects the wheel and the jig. The caster according to any one of claims 1 to 9,
A bed comprising legs supported by the casters. A trolley comprising the caster according to any one of claims 1 to 9.

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