JP2012163168A - Restriction device of wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a restriction device of a wheel capable of correctly pressing the entire area of a restriction member against a turnable wheel, and efficiently controlling the speed increase of a shopping cart, according to the speed increase rate.SOLUTION: A wheel 3 is supported so as to be rolled by a wheel supporting member 32 mounted on a turning shaft member 30 via a substantially horizontal shaft 33. The turning shaft member 30 is supported in an advancing/retracting movable manner in the axial line n direction with respect to the wheel supporting member 32, and projected downward penetrating the wheel supporting member 32. A restriction member 34 which presses the wheel 3 according to the advancing movement of the turning shaft member 30 and restricts the rolling of the wheel 3 according to the pressure is provided to its projecting end. An extension part 35 extending in the circumferential direction along the outer circumference of the wheel 3 is integrated with the restriction member 34. A co-rotation means 36 for co-rotating the restriction member 34 in the turning direction of the wheel supporting member together with the extension part 35 when the wheel supporting member 32 is turned around the axial line n is provided to the extension part 35.

Description

  The present invention provides a silver car used for elderly people's shopping and walks, a walking car used for walking training and functional recovery for the handicapped, or a moving object such as a shopping cart or a carry car around a turning axis. The present invention relates to a restricting device that restricts rolling of a wheel supported so as to be able to turn freely.

  Generally, a limiting device that restricts rolling of a wheel of a moving object such as a silver car, a walking car, or a shopping cart or a carry car is a wheel protruding below the moving object as shown in Patent Document 1 below. A brake rod is supported on the support member so as to be able to roll through a horizontal shaft, and a brake rod penetrating the wheel support member and projecting downward is provided to the wheel support member so as to move forward and backward in the axial direction. By moving the rod forward, a brake shoe provided at the lower end of the brake rod is pressed against the wheel to restrict rolling of the wheel.

  In addition, in other wheel limiting devices, some wheels provided with the limiting device are provided with a caster mechanism that allows the wheels to turn freely. For example, as shown in Patent Document 2 below, a wheel is supported by a wheel support member attached to a pivotable hollow main shaft protruding below a moving object via a substantially horizontal shaft so as to be able to roll. In addition, the lower end of the wire slidably inserted in the vertical direction (advancing and retreating direction) in the main shaft is engaged with a recess that is recessed at a predetermined interval in the circumferential direction on the inner peripheral surface of the wheel. The body is connected. Then, the rolling of the wheel is restricted by engaging the braking body with the concave portion of the wheel as the wire moves downward.

JP 2006-224742 A JP 2010-228756 A

  By the way, if there is a downward gradient during the movement of the moving object, the speed of the moving object increases. At this time, an operator who needs to depend on the moving object for a part of the body cannot follow the acceleration of the moving object. For this reason, there is a possibility that the operator may fall with the moving object to be accelerated, or to let go of the moving object to be accelerated and damage the moving object by the collision. For this reason, there is a demand for a wheel limiting device that can suppress the speed increase of the moving object according to the speed increase.

However, the wheel restricting device having the latter caster mechanism restricts the rolling of the wheel by engaging the braking body with the recess of the wheel when the wheel is stopped. Sometimes it cannot be used to suppress the acceleration of the moving object according to the speed increase.
On the other hand, in the former wheel restriction device that restricts rolling of the wheel by pressing a restriction member such as a brake shoe against the wheel, the restriction member is extended in the circumferential direction along the outer periphery of the wheel. By pressing the restricting member against the wheel, the speed of the moving object is suppressed according to the speed increase. However, since this restricting member is provided on a wheel that cannot turn, when the wheel turns, the entire region of the restricting member cannot be accurately pressed against the wheel. Cannot be suppressed efficiently.

  The present invention has been made in view of such points, and the object of the present invention is to accurately press the entire area of the restricting member against a turnable wheel and increase the speed of the moving object in accordance with the speed increase. It is an object of the present invention to provide a wheel limiting device that can be efficiently controlled.

  In order to achieve the above-described object, the present invention is premised on a limiting device that limits rolling of a wheel that is supported so as to be able to turn around an axis of a turning shaft member that protrudes downward from a moving object. Further, the wheel is supported by a wheel support member attached to the turning shaft member so as to be able to roll through a substantially horizontal shaft, and the turning shaft member can be moved forward and backward in the axial direction with respect to the wheel support member. A restriction that supports and protrudes downward through the wheel support member, presses the wheel to the protruding end as the swivel shaft member moves forward, and restricts rolling of the wheel according to the pressing force. A member is provided. And when the said limitation member is integrally provided with the extension part extended in the circumferential direction along the outer periphery of the said wheel, when the said wheel support member turns around the axis line of the said turning shaft member in this extension part, A follow-up means for turning the restricting member together with the extending portion in the turning direction is provided. In addition, an operation unit for moving the revolving shaft member forward and backward through a link mechanism is provided in the vicinity of the hand pressing unit that manually presses the moving object.

When the operation part near the hand pressing part is operated by this specific matter, the turning shaft member moves forward and backward through the link, and the restricting member presses the wheel with the advance movement, and the wheel rolls according to the pressing force. Is limiting.
In this case, the extending portion provided integrally with the restriction member is rotated together with the restriction member in the turning direction when the wheel support member turns around the axis of the turning shaft member by the turning means. Even if the part is extended in the circumferential direction along the outer periphery of the wheel, the extension part is accurately pressed by the rotatable wheel together with the restricting member, and the acceleration of the moving object is ensured according to the speed increase. To be suppressed. This makes it possible to efficiently suppress the speed increase of the moving object according to the speed increase.

  Further, the follower means is provided with one of the wheel support member and the extending portion and extending in the advancing / retreating direction of the turning shaft member, and the other of the wheel support member and the extending portion. And a guide portion that is slidably guided in a state in which the engagement portion is fitted when the pivot shaft member moves forward and backward.

  In this case, one of the wheel support member and the extending portion is engaged with the other guide portion of the wheel support member and the extending portion when the swing shaft member moves forward and backward. Since the guides are slidably guided in the combined state, the accompanying means can be configured easily.

  The turning shaft member may be provided with an urging means for urging the restricting member and the extending portion in a retreat direction that separates the wheel from the wheel.

  In this case, since the turning shaft member is provided with the urging means for urging the restricting member and the extending portion away from the wheel in the retreating direction, the operation portion is operated to allow the wheel to roll. Then, the retreat movement of the turning shaft member is assisted by the urging force of the urging means, and the operation for allowing the wheels to roll is smoothly performed. Thereby, the operativity of an operation part can be improved.

  Further, the pivot shaft member is connected to the shaft main body having the restriction member attached to one end thereof and the link mechanism, and is rotatably supported by the casing of the moving object via a horizontal shaft. A cam that is in sliding contact with the other end and whose distance from the sliding contact surface to the horizontal axis gradually increases in the circumferential direction as it rotates, and a circumferential direction in which the distance from the sliding contact surface of the cam to the horizontal axis is the largest. And a regulating surface that regulates rotation of the cam by making surface contact with the other end of the shaft main body.

  In this case, since the distance from the sliding contact surface to the other end of the shaft main body to the horizontal shaft gradually increases in the circumferential direction as the cam rotates about the horizontal shaft, the shaft main body pushes against the sliding contact surface of the cam. Then, the advancing movement is made in the axial direction, and the restricting member is pressed by the wheel along with the advancing movement, and the wheel is braked. At this time, a regulating surface provided at a circumferential position where the distance from the sliding surface of the cam to the horizontal axis is the largest is brought into surface contact with the other end of the shaft body to regulate the rotation of the cam. Thereby, a wheel is hold | maintained in the state pressed by the limitation member, and a moving target object can be hold | maintained in a braking state.

  Furthermore, the outer diameter of the wheel may be set to 100 mm or more.

  In this case, it is possible to smoothly move the moving object by overcoming the steps such as the seam of the road surface without difficulty. In addition, vibration from the road surface can be suppressed and generation of noise can be suppressed by the wheel having an outer diameter of 100 mm or more.

  In short, in the circumferential direction along the outer periphery of the wheel, the extending portion provided integrally with the restricting member that restricts rolling of the wheel is rotated together with the restricting member in the turning direction when the wheel support member turns. The extension part extended to the right can be accurately pressed against the turnable wheel together with the restricting member, and the speed increase of the moving object can be efficiently suppressed according to the speed increase.

It is the perspective view which looked at the shopping cart provided with the wheel limiting device concerning the embodiment of the present invention from the diagonal front side. It is the perspective view which looked at the shopping cart of FIG. 1 from the diagonal back side. FIG. 2 is a partially cutaway cross-sectional view showing a support structure for supporting a front wheel in FIG. 1. FIG. 3 is a partially cutaway cross-sectional view showing a non-braking state of the rear wheel limiting device of FIG. 1. FIG. 5 is a perspective view of the upper part of the wheel limiting device of FIG. 4. FIG. 5 is a partially cutaway sectional view showing a braking state of the wheel limiting device of FIG. 4. It is a partially cutaway sectional view showing a non-braking state of a rear wheel restricting device according to a modification of the embodiment. FIG. 8 is a partially cutaway sectional view showing a braking state of the wheel limiting device of FIG. 7.

  Hereinafter, a wheel limiting device according to an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a shopping cart provided with a wheel restricting device as seen from an oblique front side, and FIG. 2 is a perspective view of the shopping cart as seen from an oblique rear side.

  As shown in FIGS. 1 and 2, a shopping cart 1 as a moving object includes a substantially rectangular base 11 as a housing and a rear side that is the back side of the base 11 (the right front side in FIG. 2). A substantially U-shaped lower frame 12 that stands with its ends fixed at both left and right positions, a substantially U-shaped upper frame 13 provided on the upper side of the lower frame 12, and a base 11 And a bag 14 erected along the front side which is the front side of the lower frame 12 (the left front side in FIG. 1).

  The base 11 is made of a synthetic resin material, and its four corners are chamfered to form a curved surface in plan view. Further, the lower frame 12 has left and right vertical frame parts 121 and 122 that are connected to the base 11 and extend upward, and a horizontal frame part 123 that connects the upper ends of the vertical frame parts 121 and 122 to each other. It consists of On the other hand, the upper frame 13 includes left and right vertical frame portions 131 and 132 that are supported by the left and right vertical frame portions 121 and 122 so as to be movable back and forth in the vertical direction, and upper ends of the vertical frame portions 131 and 132. It is comprised with the horizontal frame part 133 which connects each other. This horizontal frame part 133 is configured as a hand pressing part when the shopping cart 1 is manually pressed. In this case, the horizontal frame portion 123 of the lower frame 12 has a switching portion (not shown) for switching the vertical frame portions 131 and 132 of the upper frame 13 between the extended position (position shown in FIGS. 1 and 2) and the contracted position. Z).

  The bag 14 is made of cloth and has a substantially rectangular shape whose bottom portion substantially matches the shape of the base 11. The bag 14 includes a substantially rectangular box-shaped main body 141 that opens upward, and a lid 142 that opens and closes an opening (not shown) at the upper end of the main body 141.

  A wheel mounting portion 15 is integrally provided at the four corners of the lower surface of the base 11, and the lower end of the wheel mounting portion 15 is closed by a lid member 16. A pair of left and right wheels 2 and 3 are attached to the wheel attachment portion 15 closed by the lid member 16. In this case, the lid member 16 is fixed to the lower end of the wheel mounting portion 15 by the flat head screw 10.

  As shown in FIG. 3, the front wheel 2 of each of the wheels 2 and 3 (because of the same configuration, only one will be described) protrudes downward from the front left and right corners of the base 11 respectively. The pivot member 21 is supported so as to be pivotable about its axis m. Further, a wheel support member 22 that supports the wheel 2 in a rollable manner is attached to the front turning member 21.

  The front wheel support member 22 is formed in a substantially U-shaped cross section, and supports the wheel 2 so that it can roll on both ends (lower end in FIG. 3) via a substantially horizontal shaft 23. The bottom part (upper part in FIG. 3) of the wheel support member 22 is formed in a perfect circle shape in plan view. A wheel support portion 17 having a concave portion 171 that is recessed in a perfect circle shape so as to coincide with the bottom portion of the wheel support member 22 is attached to the lower surface of the lid member 16 of the wheel attachment portion 15. And in the recessed part 171 of the wheel support part 17, the bottom part of the wheel support member 22 is inserted so that sliding is possible. In addition, the turning member 21 includes a bolt member 211 and a nut member 212. Further, through holes 161 and 172 that pass through the center position of the concave portion 171 in the vertical direction together with the lid material 16 are provided at the central position of the concave portion 171 of the lid member 16 and the wheel support portion 17. A through hole 221 that penetrates in the vertical direction is also provided at the center position of the bottom of the wheel support member 22, similarly to the lid member 16 and the recess 171. Then, with the bottom portion of the wheel support member 22 fitted in the recess 171 of the front wheel support portion 17, the bolt member 211 inserted from below into the through holes 161, 172, 221 is inserted from the top surface of the lid member 16 to the nut member 212. Thus, the front wheel support member 22 is supported in the recess 171 of the wheel support portion 17 so as to be turnable around the axis m of the bolt member 211 (turning member 21).

  On the other hand, as shown in FIG. 4, the rear wheel 3 (because of the same configuration, only one of them will be described) is connected to the turning member 31 protruding downward from the left and right corners of the rear side of the base 11. It is supported so as to be pivotable about the axis n. Further, a wheel support member 32 that supports the wheel 3 in a rollable manner is attached to the rear turning member 31.

  The rear wheel support member 32 is also formed in a substantially U-shaped cross section like the front wheel support member 22 and rolls the wheel 3 via shafts 33 that are substantially horizontal at both ends (lower end in FIG. 4). Supports freely. The bottom portion (upper portion in FIG. 4) of the wheel support member 32 is formed in a perfect circle shape in plan view. Further, the bottom portion of the wheel support member 32 is slidably fitted into the recess 171 of the wheel support portion 17 on the lower surface of the lid member 16 of the wheel mounting portion 15.

  The turning member 31 includes a bolt member 311 and a nut member 312. Further, a through hole 321 penetrating in the vertical direction is also provided at the center position of the bottom of the wheel support member 32 in the same manner as the through holes 161 and 172 of the recess 171 of the lid member 16 and the wheel support portion 17. Then, with the bottom portion of the wheel support member 32 fitted in the recess 171 of the rear wheel support portion 17, the bolt member 311 inserted through the through holes 161, 172, 321 from below is inserted into the nut member from the upper surface of the lid member 16. By screwing at 312, the rear wheel support member 32 is supported in the recess 171 of the wheel support portion 17 so as to be rotatable about the axis n of the bolt member 311 (the turning member 31). The bolt member 311 is formed in a hollow shape having a through hole 313 penetrating in the direction of the axis n.

  Further, the turning shaft member 30 is inserted into the through hole 313 of the bolt member 311 of the turning member 31. The turning shaft member 30 is supported by the turning member 31 and the wheel support member 32 so as to be movable back and forth in the direction of the axis n, and protrudes downward through the wheel support member 32. The projecting end of the pivot shaft member 30 is provided with a limiting member 34 that presses the rear wheel 3 as the pivot shaft member 30 moves forward and restricts rolling of the wheel 3 according to the pressing force. ing.

  The restricting member 34 is integrally provided with an extending portion 35 extending in the circumferential direction along the outer periphery of the rear wheel 3. The extension portion 35 is provided with a follow-up means 36 that rotates the limit member 34 together with the extension portion 35 in the turning direction when the wheel support member 32 turns around the axis n of the turning shaft member 30. ing.

  The follow-up means 36 includes a rod-shaped engaging portion 361 extending in the advancing / retreating movement direction (axis n direction) of the turning shaft member 30 from the extending portion 35 of the restricting member 34, and a wheel support member corresponding to the engaging portion 361. As a guide portion that extends in the forward / backward movement direction (axis n direction) of the pivot shaft member 30 at the corresponding edge portion 322 of 32 and that slidably guides the engagement portion 361 when the pivot shaft member 30 moves forward / backward. The guide hole 362 is provided. In this case, the corresponding edge portion 322 of the wheel support member 32 is formed in a substantially arcuate cross section conforming to the outer peripheral surface of the extending portion 35 of the limiting member 34.

  Further, the turning shaft member 30 includes a shaft main body 37 to which the limiting member 34 is attached at the lower end, and a cam 38 that is in sliding contact with the upper end (the other end) of the shaft main body 37. The shaft main body 37 includes a small-diameter rod 371 that is fixed to the lower end and extends in the axis n direction, and a large-diameter rod 372 that has an insertion hole 372a through which the upper end of the small-diameter rod 371 is inserted. The small diameter rod 371 is inserted into the through hole 313 of the bolt member 311, and its lower end (projecting end) is positioned below the wheel support member 32. The large-diameter rod 372 is slidably inserted into the cylindrical portion 18 fixed to the wheel mounting portion 15. As shown in FIG. 5, the cylindrical portion 18 includes vertical walls 181 and 181 whose left and right side portions are paired on the left and right.

  The cam 38 is rotatably supported on the vertical wall 181 of the cylindrical portion 18 via a horizontal shaft 380 extending in the left-right direction. The cam 38 has a sliding contact surface 382 that comes into sliding contact with the upper end of the large-diameter rod 372. The sliding contact surface 382 gradually increases in the circumferential direction along the rotation with respect to the axis of the horizontal axis 380 of the cam 38, and is located at the circumferential position where the distance becomes the largest at the upper end of the large-diameter rod 372. A substantially flat restricting surface 383 is provided to contact the surface and restrict the rotation of the cam 38. An attachment portion 384 for attaching one end of the link mechanism 4 is provided on the anti-sliding contact surface 382 side of the restriction surface 383.

  The link mechanism 4 includes a vertical link 41 extending in the vertical direction and a horizontal link 42 attached to the lower end of the vertical link 41 and extending horizontally in the left-right direction. The vertical link 41 has an upper end attached to the operation unit 40 attached to the left end of the horizontal frame portion 123 of the lower frame 12 that is in the vicinity of the horizontal frame portion 133 of the upper frame 13 that manually pushes the shopping cart 1. It extends downward along the frame part 121. The horizontal link 42 has a support portion 421 that supports the lower end of the vertical link 41 via a horizontal axis (not shown) extending in the left-right direction. Further, at the left and right corners of the rear side of the base 11, an enclosing member 19 having a substantially rectangular frame shape that covers the cam 38 and the vertical wall 181 of the cylindrical portion 18 from above and around is provided upright. An arcuate guide groove 191 that slides and guides the lateral link 42 is provided on the opposing surfaces of the left and right surrounding members 19. Furthermore, the left and right ends of the horizontal link 42 are inserted into the guide grooves 191 of the left and right surrounding members 19 and are rotatably supported by the mounting portion 384 of the cam 38.

  Then, the left and right rear turning shaft members 30 (shaft body 37) are advanced by rotating the cam 38 in a predetermined direction (clockwise in FIG. 4) via the link mechanism 4 when the operation unit 40 is operated downward. It is supposed to move. At this time, as shown in FIG. 6, when the left and right rear turning shaft members 30 (shaft body 37) move forward, the restricting member 34 and the extension 35 move the rear wheel 3 along with the forward movement. The rolling of the wheel 3 is restricted according to the pressing force.

  The small-diameter rod 371 includes a coil spring 39 as an urging means that is compressed between the nut member 312 and the large-diameter rod 372. The coil spring 39 is provided between the ring member 323 placed on the upper surface of the nut member 312 and the nut member 44 screwed in the vicinity of the upper end portion of the small diameter rod 371. The nut material 44 is in contact with the lower end of the large-diameter rod. The coil spring 39 urges the nut member 312 on the lid member 16 with the nut member 44, that is, the small diameter rod 371 and the large diameter rod 372, in the retreat movement direction upward in the axis n direction. At this time, if the operation unit 40 is operated upward, the retraction movement of the left and right turning shaft members 30 (shaft body 37) is assisted by the biasing force of the coil spring 39, and the operation unit 40 is moved upward via the link mechanism 4. While returning, the limiting member 34 and the extension part 35 are separated from the wheel 3, and are returned to the retreat position (position shown in FIG. 4) which contacts the corresponding edge part 322 of the wheel support member 32. In this case, the nut member 44 is provided to adjust the urging force of the coil spring 39, and the upper end of the large-diameter rod 372 is slid by the cam 38 when the operation unit 40 returns upward as shown in FIG. The wheel 3 is separated from the contact surface 382 so that resistance due to sliding contact with the sliding contact surface 382 of the cam 38 does not act on the shaft main body 37 when the wheel 3 rolls.

  Furthermore, the outer diameters of the wheels 2 and 3 are set to 100 mm or more, respectively.

  Therefore, in the said embodiment, if the operation part 40 attached to the left end of the horizontal frame part 123 of the lower frame 12 used as the vicinity of the horizontal frame part 133 of the upper frame 13 which pushes the shopping cart 1 is operated below, The left and right pivot shaft members 30 move forward and backward through the link mechanism 4, and the restricting member 34 and the extension 35 press the rear wheel 3 with the advance movement, and the wheel 3 rotates according to the pressing force. Movement is restricted.

  In that case, the extension portion 35 provided integrally with the limiting member 34 is rotated together with the limiting member 34 in the turning direction when the wheel support member 32 is turned around the axis n by the turning means 36. Even if the extending portion 35 extends in the circumferential direction along the outer periphery of the wheel 3, the extending portion 35 is accurately pressed by the rotatable wheel 3 together with the restricting member 34, and the acceleration of the shopping cart 1 is increased. It is surely suppressed according to the speed increase. Thereby, the speed increase of the shopping cart 1 can be efficiently suppressed according to the speed increase.

  In addition, the rod-shaped engaging portion 361 extending in the forward / backward movement direction (axis n direction) of the turning shaft member 30 from the extending portion 35 of the limiting member 34 corresponds to the wheel support member 32 when the turning shaft member 30 moves forward / backward. Since the edge portion 322 is slidably guided while being fitted in the guide hole 362 extending in the forward / backward movement direction of the pivot shaft member 30, the follower means 36 is simply configured by the engaging portion 361 and the guide hole 362. can do.

  In addition, since the revolving shaft member 30 is provided in the revolving shaft member 30 to urge the restricting member 34 and the extending portion 35 away from the wheel 3, when the operating portion 40 is operated upward, The retreating movement of the turning shaft member 30 (shaft body 37) on the side is assisted by the biasing force of the coil spring 39, and the operation of allowing the wheels 3 to roll is smoothly performed. Thereby, the operativity of the operation part 40 can be improved.

  Further, the turning shaft member 30 is in sliding contact with the small diameter rod 371 of the shaft main body 37 to which the limiting member 34 is attached at the lower end and the upper end of the large diameter rod 372 of the shaft main body 37, and the distance to the axis of the horizontal shaft 380 Is provided with a cam 38 having a sliding contact surface 382 that gradually increases in the circumferential direction as it rotates, so that the cam 38 rotates from the sliding contact surface 382 to the upper end of the large-diameter rod 372 to the axis of the horizontal shaft 380. Since the distance gradually increases in the circumferential direction, the shaft main body 37 is pushed to the sliding contact surface 382 of the cam 38 and moves downward, and the restricting member 34 and the extending portion 35 are moved to the wheel 3 along with the moving movement. The wheel 3 is braked by being pressed. At this time, the regulating surface 383 provided at the circumferential position where the distance from the sliding surface 382 of the cam 38 to the axis of the horizontal shaft 380 is the largest is in surface contact with the upper end of the large-diameter rod 372 and The rotation of 38 is restricted. Thereby, the wheel 3 is hold | maintained in the state pressed by the limitation member 34 and the extension part 35, and the shopping cart 1 can be hold | maintained in a braking state.

  Furthermore, since the outer diameters of the wheels 2 and 3 are set to 100 mm or more, the wheels 2 and 3 can easily get over the steps such as the joints of the road surface, and the shopping cart 1 can be moved smoothly. In addition, vibrations from the road surface are suppressed by the wheels 2 and 3 having an outer diameter of 100 mm or more, and generation of noise can be suppressed.

  In addition, this invention is not limited to the said embodiment, The other various modifications are included. For example, in the above-described embodiment, the case where the object is applied to the shopping cart 1 as a moving object has been described. However, a silver car used for shopping or walking for elderly people, or walking used for walking training or functional recovery for the disabled. Of course, the present invention may be applied as a wheel limiting device for a moving object such as a car or a carry car.

  Further, in the above-described embodiment, the rod-shaped engagement portion 361 extending in the forward / backward movement direction of the turning shaft member 30 from the extending portion 35 of the restricting member 34 when the turning shaft member 30 moves forward / backward is provided on the wheel support member 32. The corresponding edge portion 322 is slidably guided in a state of being fitted in the guide hole 362 extending in the forward / backward movement direction of the pivot shaft member 30, but the engaging portion is provided at the corresponding edge portion of the wheel support member. May be provided in the extending part of the restricting member. Further, the follower means is provided on one of the wheel support member and the extension part and on the other of the wheel support member and the extension part, and the engagement part is fitted when the revolving shaft member moves forward and backward. It may be a groove-shaped guide portion that is slidably guided in the combined state.

Furthermore, in the said embodiment, although the limitation member 34 and the extension part 35 pressed the rear wheel 3 at the time of the advancing movement of the turning shaft member 30, the rolling of the wheel 3 was limited according to the pressing force. 7 and 8, in addition to restricting the rolling of the wheel 3 when the turning shaft member 30 moves forward, the turning of the wheel 3 is restricted by restricting the turning of the wheel support member 32 around the axis n. You may make it do.
Specifically, a bottomed cylindrical shape having a through hole (not shown) penetrating on the axis n at the bottom and concave portions 51, 51,... Recessed downward at a constant pitch in the circumferential direction at the upper end. The first member 5 has a through hole (not shown) penetrating on the axis n at the bottom, and protrudes downward at every 90 degrees in the circumferential direction at the lower end to fit into the recess 51 of the first member 5. A bottomed cylindrical second member 6 having convex portions 61, 61,. Then, the small diameter rod 371 is inserted into the through hole of the first member 5, and the bottom portion of the first member 5 is fixed on the lid member 16 by the nut member 312, so that the small diameter rod 371 is rotatable with respect to the first member 5. And the recess 51 is positioned on the upper side of the first member 5. On the other hand, by inserting the small diameter rod 371 through the through hole of the second member 6 and fixing the bottom of the second member 6 to the lower surface of the nut member 44, the second member 6 is connected to the small diameter rod 371 in a rotationally integrated manner. The convex portion 61 is positioned below the second member 6 so as to face the concave portion 51. And as shown in FIG. 8, while restrict | rotating the wheel 3 by the limitation member 34 and the extension part 35 at the time of the advancing movement of the turning shaft member 30 (shaft main body 37), each recessed part 51 of the 1st member 5 On the other hand, the turning of the wheel 3 is restricted by fitting the convex portions 61 of the second member 6 and restricting the turning of the wheel support member 32 about the axis n. In this case, when the wheel 3 is braked, the turning of the wheel 3 is also restricted, so that more stable braking of the wheel 3 can be obtained.

1 shopping cart 11 base (frame)
133 Horizontal frame part (hand pushing part) of upper frame
3 Rear wheel 30 Rotating shaft member 32 Wheel support member 33 Shaft 34 Limiting member 35 Extension portion 36 Rotating means 361 Engaging portion 362 Guide hole (guide portion)
37 Shaft body 38 Cam 380 Horizontal axis (Cam horizontal axis)
382 Sliding contact surface 383 Restricting surface 39 Coil spring (biasing means)
4 Link mechanism 40 Operation unit n Axis of pivot shaft member

Claims (5)

A limiting device for restricting rolling of a wheel supported so as to be turnable around an axis of a turning shaft member protruding downward from a moving object,
The wheel is supported by a wheel support member attached to the swivel shaft member so as to be freely rollable via a substantially horizontal shaft,
The swivel shaft member is supported so as to be movable back and forth in the axial direction with respect to the wheel support member, protrudes downward through the wheel support member, and the swivel shaft member moves forward at the protruding end. A limiting member is provided that presses the wheel and restricts rolling of the wheel according to the pressing force.
The limiting member is integrally provided with an extending portion extending in the circumferential direction along the outer periphery of the wheel, and the extending portion is provided with the extending portion when the wheel support member turns around the axis of the turning shaft member. In the swivel direction, there is provided a swivel means for swiveling the restricting member together with the extending portion,
An apparatus for restricting a wheel according to claim 1, wherein an operation unit for moving the turning shaft member forward and backward through a link mechanism is provided in the vicinity of the hand pressing unit for manually pressing the moving object. The revolving means is
An engaging portion provided on one of the wheel support member and the extending portion and extending in the advancing and retracting direction of the pivot shaft member;
A guide portion that is provided on the other of the wheel support member and the extension portion, and that slidably guides in a state in which the engagement portion is fitted when the revolving shaft member moves forward and backward;
The wheel limiting device according to claim 1, comprising:   The wheel limiting device according to claim 1, wherein the turning shaft member includes an urging unit that urges the restricting member and the extending portion in a retreat direction that separates the extending portion from the wheel. The pivot shaft member is
A shaft body with the limiting member attached to one end;
It is connected to the link mechanism and is rotatably supported by the casing of the moving object via a horizontal shaft so as to be in sliding contact with the other end of the shaft main body, and the distance from the sliding contact surface to the horizontal shaft is rotated. A cam that gradually increases in the circumferential direction along with,
A regulation surface that is provided at a circumferential position where the distance from the sliding surface of the cam to the horizontal axis is the largest, and is in surface contact with the other end of the shaft body to regulate the rotation of the cam;
The wheel limiting device according to any one of claims 1 to 3, further comprising:   The wheel restricting device according to any one of claims 1 to 4, wherein an outer diameter of the wheel is set to 100 mm or more.

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