JP2005231606A - Locking operation device for caster - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking operation device for a caster, facilitating operation in either of locking and unlocking a wheel of a caster. <P>SOLUTION: The device comprises as follows: An operating bar B penetrates an upper part of a base plate 6 fixed to the caster C or a base frame 1, and a return spring 7a is interposed in the operating bar to fix a cam 8. A ratchet 9 is rotatably mounted to one end of the cam at its lower end by interposing a return spring 7b. A lock portion 8a is provided at the other end of the cam at its lower end. On a lower portion of the base plate, a switching gear 10 provided with an engaging teeth 10a with a tip end hook 9a of the ratchet and a pressing portion 10b with a recessed/projecting portion 11a of a lock-unlocking lever 11 is rotatably attached. One end of the lock-unlocking lever is rockably attached to a lower portion side end of the base plate through a return spring 7c, and a lock portion 11c is provided at the other end of the lock-unlocking lever. Recessed/projecting teeth are provided on a center inner side. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a caster lock operating device that is used by being attached to the bottom of a bed or a carriage.

  Conventionally, as this type of lock operation device, for example, as shown in FIG. 22, there is one implemented on a caster C having a lock mechanism on a base frame 52 of a bed 51. This lock operation device is provided with an interlocking lock operation mechanism 54 that enables the lock mechanisms in the casters C to be collectively locked and unlocked. The interlock lock operating mechanism 54 includes a center step Sc at the center of the operation bar B spanned between the casters C, C provided at both ends of the base frame 52 of the bed 51, and a side step Ss at both ends. Ss is provided (Patent Document 1).

  And as caster C provided with the said lock mechanism, as shown, for example in FIGS. 23-25, the wheel 5 is rotatably attached to the flame | frame 22 attached to the lower part of the spindle part 21 so that rotation was possible. The support shaft portion 21 is provided with an operation pin 24 vertically movable so that the operation bar B is disposed in the horizontal direction above the operation pin 24, and the lower portion of the support shaft portion 21. The engagement gear 26 is fixed to the front. A brake arm 27 is pivotally supported inside the frame 22. Further, an engagement gear 28 is fixed to the outer periphery of the support pin 5a of the wheel 5.

  The operation bar B rotates the cam 29 mounted in the cam chamber 21a of the support shaft portion 21. The operation pin 24 is always pressed upward by a spring 30 attached to the spring chamber 21 b of the support shaft portion 21, and the cam 29 is brought into contact with the upper end of the operation pin 24. The lower end of the operation pin 24 is in contact with the upper end of an adjustment bolt 31 that is screwed onto the brake arm 27 and attached. A distal end of a support brake body 33 that rotates coaxially with the brake arm 27 via a return spring 32 is detachably disposed on an engagement tooth 26 a of the engagement gear 26. Further, an engagement end 34a of a wheel braking body 34 attached to a lower portion of the braking arm 27 is detachably disposed on an engagement tooth 28a of the engagement gear 28 (Patent Document 2).

  Therefore, in order to lock the wheel 5 of the caster C with the conventional lock operation device, the center step Sc or the side steps Ss, Ss disposed on the operation bar B from the state shown in FIGS. The operation bar B is rotated by, for example, stepping on to bring the cam 29 into the state shown in FIG. Then, the contact between the cam 29 and the upper end of the operation pin 24 becomes the longer diameter side of the cam 29, and the operation pin 24 overcomes the pressing force of the spring 30 and is lowered. When the operation pin 24 is lowered, the lower end of the operation pin 24 pushes down the adjustment bolt 31, so that the brake arm 27 rotates overcoming the pressing force of the return spring 32 and rotates coaxially with the brake arm 27. The tip end of the support shaft braking body 33 is engaged with the engagement teeth 26a of the engagement gear 26 fixed to the lower portion of the support shaft portion 21, and the turning of the frame 22 is locked. Further, by the rotation of the brake arm 27, the engagement end 34 a of the wheel brake body 34 attached to the brake arm 27 is engaged with the engagement teeth 28 a of the engagement gear 28 fixed to the support pin 5 a of the wheel 5. 5 is locked.

Next, in order to unlock the wheel 5 of the caster C, the center step Sc or the side steps Ss, Ss disposed on the operation bar B is lifted from below with the foot from the state shown in FIG. Then, the operation bar B is rotated in the reverse direction to return the cam 29 to the state shown in FIGS. Then, the contact between the cam 29 and the upper end of the operation pin 24 becomes the short diameter side of the cam 29, and the operation pin 24 is pushed up by the spring 30 and moves up. When the operating pin 24 is raised, the braking arm 27 and the support brake body 33 are rotated by the pressing force of the return spring 32 to return to the original state. Is disengaged from the engagement teeth 26a of the engagement gear 26 fixed to the lower portion of the frame 22 and the rotation of the frame 22 is released. Further, when the brake arm 27 rotates and returns to the original state, the engagement end 34 a of the wheel brake body 34 attached to the brake arm 27 is engaged with the engagement gear 28 fixed to the support pin 5 a of the wheel 5. The wheel 5 is released from the tooth 28a and the wheel 5 is unlocked.
JP 2002-172903 A (2nd page, FIG. 1) Japanese Patent No. 3252266 (5th page, FIGS. 4 to 6)

  However, in the above conventional caster locking operation device, when the wheel 5 is to be locked, the center step Sc or the side steps Ss, Ss can be stepped on from the upper side, so that the operation is easy. When 5 is unlocked, it has to be lifted by inserting the foot under the center step Sc or the side steps Ss, Ss, and thus has a problem that the operation is very difficult. .

  Therefore, the present invention solves the above-described conventional problems, and it is sufficient to step the step with the foot from the upper side in both cases where the wheel of the caster is locked and when the wheel is unlocked. Thus, the present invention has been made for the purpose of providing a caster lock operating device that facilitates the operation.

  Therefore, the present invention is a lock operating device equipped on a caster C in which the wheel 5 is locked and unlocked by the rotation of the operation bar B, and is provided on the upper part of the base plate 6 fixed to the caster C or the base frame 1. The operation bar B is penetrated, the return spring 7a is interposed in the operation bar B, the cam 8 is fixed, and the return spring 7b is interposed in the lower end of one end of the cam 8 so that the ratchet 9 is rotatably attached. A lock portion 8 a is provided at the lower end of the other end of the cam 8, and a pressing portion between the meshing tooth 10 a with the tip claw 9 a of the ratchet 9 and the concavo-convex portion 11 a of the lock unlock lever 11 is provided at the lower portion of the base plate 6. 10b and a switching gear 10 which is attached to be freely rotatable, and a return spring 7c is interposed at the lower side end of the base plate 6 so that the lock is Attaching one end of the unlocking lever 11 as swingable, and those provided with a locking portion 11c to the other end of the lock unlocking lever 11, it is assumed that provided with the uneven teeth 11a at the center inside.

  In the present invention, the operation bar B is provided between the casters C facing each other at both ends of the pair of longitudinal frames 1a of the base frame 1, and the operation bar B is rotated on one operation bar B. It is assumed that a step S is provided, and an interlocking rod 4 is stretched between the operation bar B and the other operation bar B.

  Furthermore, in the present invention, the operation bar B is installed between the longitudinal frames 1a at the approximate center of the pair of longitudinal frames 1a of the base frame 1, and is operated on one end side of the pair of longitudinal frames 1a. It is assumed that a step S for rotating the bar B is provided, and an interlocking rod 4 is spanned between the operation bar B and step S.

  In the present invention, the operation bar B is connected to one end of an interlocking rod 4 arranged along a pair of longitudinal frames 1 a of the base frame 1, and the interlocking rod 4 is connected to the other end of the interlocking rod 4. It is assumed that a step S for operating and rotating the operation bar B is provided.

  Further, in the present invention, a guide hole 13 is formed in a substantially central portion of the base plate 6, and the slide protrusion 8 b provided in the vicinity of the lock portion 8 a of the cam 8 extends along the guide hole 13, The cam 8 rotates smoothly.

  In the present invention, the rotation end Sa of the rotation portion S2 of the step S is rotatably attached to the support shaft portion 21 of the caster C, and the caster C is located above the attachment position of the rotation end Sa. The bent portion 41a of the substantially reverse-shaped actuating member 41 is rotatably attached to the support shaft portion 21 and the upper end of the actuating member 41 is rotatably attached to one end of the interlocking member 42. The other end of the actuating member 41 is pivotally attached to an intermediate position between the pivot end Sa2 and the operation end Sb of the pivot part S2 of the step S, and the lower end of the operating member 41 is pivotally attached to one end of the interlocking rod 4. It is supposed to be.

  The caster lock operating device according to the present invention is configured as described above, and therefore, when the wheel 5 of the caster is set to the locked state or the wheel 5 is set to the unlocked state, the step is set to the upper side. Since it is only necessary to perform the same operation, such as stepping with a foot, the operation becomes easy.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a lock operating device for casters according to the present invention will be described below in detail with reference to the drawings.

  1 to 3 show an embodiment in which the lock operating device A for casters according to the present invention is implemented on casters C attached to both ends of a pair of longitudinal frames 1a of a base frame 1 such as a bed. It is attached to one end of any operation bar B.

  The operation bar B shown in FIG. 1 is provided between the casters C and C facing each other at both ends of the pair of longitudinal frames 1a of the base frame 1, and one operation bar B is rotated by the operation bar B. Step S is provided, and an interlocking rod 4 is placed between the operation bar B and the other operation bar B so that the rotation of one operation bar B is interlocked with the other operation bar B. Yes. The step S is provided at a position slightly closer to one side than the center of the operation bar B. Even if it is just the center of the operation bar B, the step S is provided at a position closer to one side of the operation bar B. Alternatively, a plurality of operation bars B may be provided.

  The operation bar B shown in FIG. 2 is installed between the longitudinal frames 1a at the approximate center of the pair of longitudinal frames 1a of the base frame 1, and the operation bar B is provided at one end of the pair of longitudinal frames 1a. Is provided with a step S for rotating the operation bar B, and an interlocking rod 4 is provided between the operation bar B and step S. Although not shown, the operation bars B face each other even if they are installed between the longitudinal frames 1a on the rear end side (the side opposite to step S) of the pair of longitudinal frames 1a of the base frame 1. It may be provided between the casters C and C.

  The operation bar B shown in FIG. 3 is connected to at least one end of the interlocking rod 4 arranged along the pair of longitudinal frames 1a of the base frame 1, and the other end of the interlocking rod 4 is connected to these ends. It is assumed that a step S for operating the interlocking rod 4 and rotating the operation bar B is provided. In this step S, the rotating portion S2 for operating the interlocking rod 4 is connected to both ends of the operating portion S1, but it may be composed of only the rotating portion S2 as shown in FIGS. . Then, the rotation end Sa of the rotation portion S2 of the step S is rotatably attached to the support shaft portion 21 of the caster C, and the support shaft portion of the caster C positioned above the attachment position of the rotation end Sa. 21, a bent portion 41 a of a substantially reverse-shaped actuating member 41 is rotatably attached, and the upper end of the actuating member 41 is pivotally attached to one end of the interlocking member 42, and the other end of the interlocking member 42 is It is assumed that the step S is pivotably attached to an intermediate position between the pivot end Sa and the operation end Sb of the pivot portion S2, and the lower end of the operating member 41 is pivotally attached to one end of the interlocking rod 4. In this case, the length from the bent portion 41a to the upper end of the actuating member 41 is shorter than the length of the interlocking member 42. However, as shown in FIGS. The rotation angle β is not so large as the operation angle α. However, as shown in FIGS. 6 and 7, if the difference in length between the two is large, the rotation angle β is larger than the operation angle α, and the operating efficiency of the interlocking rod 4 is improved. Therefore, when the operation angle α cannot be increased, that is, when the base frame 1 is at a low position such as a low-floor bed, the length from the bent portion 41a to the upper end of the operating member 41 and the interlocking member 42 The difference in length may be made larger so that the rotation angle β is larger than the operation angle α.

  The caster lock operating device A according to the present invention is mounted on a caster C in which the wheel 5 is locked and unlocked by the rotation of the operation bar B. As shown in FIGS. An operation bar B is passed through a through hole 6a formed in the upper portion of the base plate 6 fixed to the base frame 1, and a cam 8 is fixed to the operation bar B with a return spring 7a interposed. In the illustrated example, the operation bar B is a hexagonal bar, and the cam 8 is easily fixed to the operation bar B with a worm screw 2 or the like, but the operation bar B is not limited to the hexagonal bar. A ratchet 9 is rotatably attached to a lower end of the cam 8 with a return spring 7b interposed therebetween, and a lock portion 8a is projected from the lower end of the other end of the cam 8.

  Further, the cylindrical body 6b projecting from the lower part of the base plate 6 is provided with a meshing tooth 10a with the tip claw 9a of the ratchet 9 and a pressing part 10b with the concavo-convex part 11a of the lock unlock lever 11 described later. The switching gear 10 thus formed is attached so as to be rotatable by a set bolt 12. The meshing teeth 10a of the switching gear 10 are eight teeth, and the pressing portion 10b of the switching gear 10 is formed in a cross shape and projecting in four directions. It is formed on the back and front of the gear 10.

  Further, the lock / unlock lever 11 is swingably attached to a cylindrical body 6c protruding from the lower end of the base plate 6 with a return spring 7c interposed. The lock / unlock lever 11 is substantially U-shaped and is swingably attached by inserting the cylindrical body 6c into a through hole 11b formed at one end, and a lock portion 11c is provided at the other end. It is assumed that concave and convex teeth 11a with the pressing portion 10b of the switching gear 10 are provided inside the center.

  In addition, a guide hole 13 is formed in a substantially central portion of the base plate 6, and the cam 8 is arranged so that a slide protrusion 8 b protruding near the lock portion 8 a of the cam 8 extends along the guide hole 13. Is designed to rotate smoothly.

  The caster C has a structure similar to that of a conventional caster as shown in the background art column, for example. That is, as shown in FIGS. 23 to 25, the wheel 5 is rotatably attached to a frame 22 that is pivotably attached to the lower portion of the support shaft portion 21. The support shaft portion 21 is provided with an operation pin 24 vertically movable so that the operation bar B is disposed in the horizontal direction above the operation pin 24, and the lower portion of the support shaft portion 21. The engagement gear 26 is fixed to the front. A brake arm 27 is pivotally supported inside the frame 22. Further, an engagement gear 28 is fixed to the outer periphery of the support pin 5a of the wheel 5.

  The operation bar B rotates the cam 29 mounted in the cam chamber 21a of the support shaft portion 21 of the caster C. The operation pin 24 is always pressed upward by a spring 30 attached to the spring chamber 21 b of the support shaft portion 21, and the cam 29 is brought into contact with the upper end of the operation pin 24. The lower end of the operation pin 24 is in contact with the upper end of an adjustment bolt 31 that is screwed onto the brake arm 27 and attached. A distal end of a support brake body 33 that rotates coaxially with the brake arm 27 via a return spring 32 is detachably disposed on an engagement tooth 26 a of the engagement gear 26. Further, an engagement end 34 a of a wheel braking body 34 attached to the lower part of the braking arm 27 is detachably disposed on an engagement tooth 28 a of the engagement gear 28.

  Therefore, in order to bring the wheel 5 of the caster C into the locked state by the lock operating device A of the present invention, the step shown in FIG. When this operation bar B is rotated, the other operation bar B is rotated by the interlocking rod 4. 2 shows that when the interlocking rod 4 is operated by stepping on the step S provided on one end side of the longitudinal frame 1a of the base frame 1 with a foot or the like, the operation bar B installed between the longitudinal frames 1a is operated. Rotates. In the case shown in FIG. 3, when the interlocking rod 4 is actuated by, for example, stepping on the operation portion S1 of step S, an operation bar B (not shown) connected to one end of the interlocking rod 4 rotates. .

  Then, the cam 8 fixed to the operation bar B rotates, and as shown in FIG. 17, the tip claw 9 a of the ratchet 9 rotatably attached to the cam 8 is rotatable to the lower part of the base plate 6. It hits the meshing tooth 10a of the attached switching gear 10. Then, as shown in FIG. 18, the switching gear 10 rotates, and the unevenness of the lock / unlock lever 11 that is swingably attached to the lower side end of the base plate 6 by the pressing portion 10b of the switching gear 10. When the pressing of the portion 11a is released, the lock portion 11c at one end of the lock / unlock lever 11 is raised by the return spring 7c.

  In this state, when the foot is released from step S, as shown in FIG. 19, the cam 8 is reversely rotated by the return spring 7a, and the lock portion 8a at the lower end of the other side portion of the cam 8 When the lever 11 hits the lock portion 11c at one end and stops, the operation bar B also stops at the rotational position.

  Then, as described above, in the caster C, as shown in FIG. 25, the contact between the cam 29 and the upper end of the operation pin 24 becomes the longer diameter side of the cam 29, and the operation pin 24 overcomes the pressing force of the spring 30. Pushed down. When the operation pin 24 is lowered, the lower end of the operation pin 24 pushes down the adjustment bolt 31, so that the brake arm 27 rotates overcoming the pressing force of the return spring 32 and rotates coaxially with the brake arm 27. The tip end of the support shaft braking body 33 is engaged with the engagement teeth 26a of the engagement gear 26 fixed to the lower portion of the support shaft portion 21, and the turning of the frame 22 is locked. Further, by the rotation of the brake arm 27, the engagement end 34 a of the wheel brake body 34 attached to the brake arm 27 is engaged with the engagement teeth 28 a of the engagement gear 28 fixed to the support pin 5 a of the wheel 5. 5 is locked.

  Further, in order to change the wheel 5 from the locked state to the unlocked state, in the lock operating device A of the present invention shown in FIG. 1, as shown in FIG. When this operation bar B is rotated by stepping on S again with a foot or the like, the other operation bar B is rotated by the interlocking rod 4. In the lock operating device A of the present invention shown in FIG. 2, when the interlocking rod 4 is actuated by stepping the step S provided on one end side of the longitudinal frame 1a of the base frame 1 once again with a foot, the longitudinal frame 1a. The operation bar B installed between them rotates. In the lock operating device A of the present invention shown in FIG. 3, when the interlocking rod 4 is actuated by once again stepping on the operation portion S1 of step S with a foot, the operation bar B connected to one end of the interlocking rod 4 is operated. Rotates.

  Then, the cam 8 fixed to the operation bar B rotates, and as shown in FIG. 21, the lock portion 8 a at the lower end of the other side portion of the cam 8 is raised, and the tip claw 9 a of the ratchet 9 is moved to the switching gear 10. The switching gear 10 rotates upon contact with the meshing tooth 10a, the pressing portion 10b of the switching gear 10 is pressed against the concavo-convex portion 11a of the lock / unlock lever 11, and the lock portion 11c at one end of the lock / unlock lever 11 is moved. Descend.

  In this state, when the foot is released from step S, as shown in FIG. 8, the lock portion 8a of the cam 8 passes through the lock portion 11c, and the cam 8 is reversely rotated by the return spring 7a. The operation bar B rotates in the reverse direction and stops at that position.

  Then, as described above, in the caster C, as shown in FIGS. 23 and 24, the contact between the cam 29 and the upper end of the operation pin 24 becomes the short diameter side of the cam 29, and the operation pin 24 pushes against the spring 30. To rise. When the operating pin 24 is raised, the braking arm 27 and the support brake body 33 are rotated by the pressing force of the return spring 32 to return to the original state. Is disengaged from the engagement teeth 26a of the engagement gear 26 fixed to the lower portion of the frame 22 and the rotation of the frame 22 is released. Further, when the brake arm 27 rotates and returns to the original state, the engagement end 34 a of the wheel brake body 34 attached to the brake arm 27 is engaged with the engagement gear 28 fixed to the support pin 5 a of the wheel 5. The wheel 5 is released from the tooth 28a and the wheel 5 is unlocked.

  Therefore, in the case where the wheel 5 of the caster C is brought into the locked state or the wheel 5 is brought into the unlocked state by the operation of the lock operation device of the present invention, the same step S is performed as if the step S is stepped on from the upper side. It only has to operate.

It is a perspective view which shows one Embodiment with which the lock operating device of the caster of this invention was mounted | worn with the caster attached to base frames, such as a bed. It is a perspective view which shows other embodiment with which the lock operating device of the caster of this invention was mounted | worn with base frames, such as a bed. It is a perspective view which shows other embodiment with which the lock operation apparatus of the caster of this invention was mounted | worn with the caster attached to base frames, such as a bed. It is explanatory drawing which shows an example of the state before depressing the step of the locking operation apparatus of the caster of this invention shown in FIG. It is explanatory drawing which shows an example of the state after depressing the step of the locking operation apparatus of the caster of this invention shown in FIG. It is explanatory drawing which shows the other example of the state before depressing the step of the locking operation apparatus of the caster of this invention shown in FIG. It is explanatory drawing which shows the other example of the state after depressing the step of the locking operation apparatus of the caster of this invention shown in FIG. It is a front view of the lock operating device of the caster of this invention. It is a side view of the lock operating device of the caster of this invention. It is a front view of the base plate of the lock operating device of the caster of this invention. It is a front view of the cam of the lock operating device of the caster of this invention. It is a side view of the cam of the lock operating device of the caster of this invention. It is a front view of the switching gear of the lock operating device of the caster of this invention. It is a side view of the switching gear of the lock operating device of the caster of this invention. It is a front view of the lock unlock lever of the lock operating device of the caster of this invention. It is a top view of the lock unlocking lever of the lock operating device of the caster of this invention. It is explanatory drawing which shows the operating state of the lock operating device of the caster of this invention. It is explanatory drawing which shows the operating state of the lock operating device of the caster of this invention. It is explanatory drawing which shows the operating state of the lock operating device of the caster of this invention. It is explanatory drawing which shows the stepping-on state of the step of the locking operation apparatus of the caster of this invention shown in FIG. It is explanatory drawing which shows the operating state of the lock operating device of the caster of this invention. It is an external appearance perspective view which shows an example of the lock operation apparatus of the conventional caster. It is a partially broken explanatory view of a caster in which a conventional lock operation device is used. It is sectional drawing of the unlocked state of the wheel of the caster shown in FIG. It is sectional drawing of the lock state of the wheel of the caster shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base frame 1a Longitudinal frame 4 Interlocking rod 5 Wheel 6 Base plate 7a Return spring 7b Return spring 7c Return spring 8 Cam 8a Lock part 9 Ratchet 9a Tip claw 10 Switching gear 10a Engagement tooth 10b Pushing part 11 Lock unlock lever 11a Uneven part 11c Lock part 13 Guide hole 41 Actuating member 41a Bending part 42 Interlocking member B Operation bar C Caster S Step Sa Rotating end Sb Operating end S1 Operating part S2 Rotating part

Claims (6)

  A base plate fixed to a caster (C) or a base frame (1), which is a lock operating device mounted on a caster (C) in which a wheel (5) is locked and unlocked by rotation of an operation bar (B). An operation bar (B) is passed through the upper part of (6), a return spring (7a) is interposed between the operation bar (B) and the cam (8) is fixed, and the cam (8) returns to the lower end of one end. A ratchet (9) is pivotally attached via a spring (7b), a lock part (8a) is provided at the lower end of the other end of the cam (8), and the ratchet is provided below the base plate (6). The switching gear (10) which is provided with the meshing tooth (10a) with the tip claw (9a) of (9) and the pressing part (10b) with the concavo-convex part (11a) of the lock / unlock lever (11). Is mounted as rotatable Further, one end of the lock / unlock lever (11) is swingably attached to the lower end of the base plate (6) with a return spring (7c) interposed, and locked to the other end of the lock / unlock lever (11). A caster lock operating device characterized in that the portion (11c) is provided and the concave and convex teeth (11a) are provided inside the center. The operation bar (B) is provided between the casters (C, C) facing each other at both ends of the pair of longitudinal frames (1a) of the base frame (1). A step (S) for rotating the bar (B) is provided, and an interlocking rod (4) is bridged between the operation bar (B) and the other operation bar (B). The caster lock operating device according to claim 1.   The operation bar (B) is installed between the longitudinal frames (1a) at the approximate center of the pair of longitudinal frames (1a) of the base frame (1), and one end side of the pair of longitudinal frames (1a). Each is provided with a step (S) for rotating the operation bar (B), and an interlocking rod (4) is spanned between the operation bar (B) and step (S). The caster lock operating device according to claim 1.   The operation bar (B) is connected to one end of an interlocking rod (4) arranged along a pair of longitudinal frames (1a) of the base frame (1), and the other end of the interlocking rod (4) is 2. The caster lock operating device according to claim 1, further comprising a step (S) for operating the interlocking rod (4) and rotating the operation bar (B).   A guide hole (13) is formed at a substantially central portion of the base plate (6), and a slide protrusion (8b) provided in the vicinity of the lock portion (8a) of the cam (8) is along the guide hole (13). The caster lock operating device according to claim 1, characterized in that the cam (8) rotates smoothly. The rotation end (Sa) of the rotation portion (S2) in the step (S) is rotatably attached to the support shaft portion (21) of the caster (C), and the attachment position of the rotation end (Sa) is determined. A bent portion (41a) of a substantially reverse-shaped actuating member (41) is rotatably attached to a support shaft portion (21) of a caster (C) positioned above, and an upper end of the actuating member (41). Is attached to one end of the interlocking member (42), and the other end of the interlocking member (42) is connected to the rotating end (Sa) and the operating end (Sb) of the rotating portion (S2) of the step (S). The caster lock operating device according to claim 3 or 4, characterized in that it is pivotally attached to an intermediate position and the lower end of the actuating member (41) is pivotally attached to one end of the interlocking rod (4).

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