JP5424156B2 - Caster lock operating device - Google Patents

Description

  This invention is suitable for keeping casters attached to carts used in supermarkets, convenience stores, etc., and casters attached to mobile beds used in hospitals, nursing homes, etc. The present invention relates to a lock operating device for a caster.

  Conventionally, as this type of caster lock operating device A, as shown in FIG. 10, for example, between casters C and C attached to the front and rear of a pair of longitudinal frames 21a of a base frame 21 such as a movable bed. There are those mounted on both ends of the operation bars B, B respectively installed. One operation bar B shown in the figure is provided with a step Sp for rotating the operation bar B, and an interlocking rod 22 is stretched between the operation bar B and the other operation bar B. The other operation bar B can be rotated simultaneously by rotating the operation bar B (Patent Document 1).

  When the lock operating device A is attached to a movable bed or the like, in order to complete the locked state, one in each of the front and rear operation bars B and B, a total of four (one is a solid line) It is assumed that all four casters C can be locked, but all four casters C can be locked. Even if it is not possible to lock the casters C, it is assumed that a total of two, one at each end of the front and rear operation bars B, B, are installed, so that the two casters C can be locked. The function can be fully exhibited.

JP-A-2005-231606

  However, in the above-described conventional caster lock operation device, since one lock operation device is mounted on one caster C, the number of lock operation devices mounted on each movable bed or cart is large. It was necessary and the problem was that the mobile bed and cart would be expensive.

  Furthermore, the above-described conventional caster locking operation device requires a large number of parts such as a return spring, and the assembly of each part is complicated, which takes time for assembly work and makes assembly work difficult. It had the problem of being.

  Therefore, the present invention has an object to solve the above-mentioned conventional problems, so that two casters C can be operated by one lock operation device, and are mounted per movable bed or cart. Provided is a caster lock operation device that requires only a small number of lock operation devices, reduces the number of components, makes it easy to incorporate each component, does not take time for assembly work, and makes assembly work simple. It was made for the purpose.

Therefore, in the present invention, the brake shoe 2 fixed at both ends of the operation bar B is rotated by rotating the operation bar B installed between the two casters C attached to the base 1, and the tire of the caster C is used. t is brought into a locked state by bringing it into contact with t, and the brake shoe 2 is brought into an unlocked state by releasing the brake shoe 2 from the tire t of the caster C by returning the rotated operation bar B to its original state. A caster locking operation device, wherein the operation bar B is penetrated through a main body frame 4 projecting below the base 1 at an intermediate portion of the two casters C. 4 includes a step 3, a lock lever 5, a lock cam 6, and a support cam 7. The step 3 is configured so that the operation unit 3a is connected to the base 1 or not. The lock lever 5 is fixed to the operation bar B via a return spring 8 so as to protrude, and the lock lever 5 is provided with ratchet teeth 5a at the lower end, and a cam return piece 5b is provided above the ratchet teeth 5a. As shown, the lock cam 6 is provided with a slide projection 6b having a shaft hole 6a at a substantially central portion, and an engaging claw 6c at a position above the shaft hole 6a. The end is provided with a contact 6d with a stop 4d provided on the main body frame 4, and is rotatably attached to the main body frame 4 so that the engaging claw 6c can be fixed to the ratchet teeth 5a of the lock lever 5. The support cam 7 is provided with a contact portion 7a with the cam return piece 5b of the lock lever 5 at a substantially upper center portion, and a long hole is formed below the contact portion 7a. In addition, the guide hole 7b is rotatably attached to the main body frame 4, the slide projection 6b of the lock cam 6 enters the guide hole 7b, and the abutting portion 7a moves up and down. It is assumed that a release spring (10) is provided between the distal end portion 6e of the lock cam 6 and the distal end portion 7d of the support cam 7 so as to spring-bias the distal end portions 6e and 7d in a repulsive direction.

  Further, in the caster locking operation device according to the present invention, the release spring 10 has one end 10 a hooked into the small hole 11 provided in the tip end 6 e of the lock cam 6 and the other end 10 b set to the tip end of the support cam 7. By hooking on the small hole 12 provided in 7d, the tip portions 6e and 7d are inverted by up and down.

  Since the lock operating device for casters of the present invention is configured as described above, two casters C can be operated by one lock operating device. Since the number of lock operation devices to be mounted on the machine is small, the number of parts is reduced, and it is easy to incorporate each part, the assembly work does not take much time and the assembly work becomes simple.

It is a front view of the state which attached the lock operating device of the caster of this invention to bases, such as a trolley | bogie. It is a bottom view of the state which attached the lock operating device of the caster of this invention to bases, such as a trolley | bogie. It is sectional drawing of the lock operation apparatus of the caster of this invention by the AA line in FIG. 1, (a) has shown the unlocked state, (b) has shown the locked state. It is a front view of the principal part of the lock operating device of the caster of this invention. It is sectional drawing of the lock operation apparatus of the caster of this invention by the BB line in FIG. The step and lock lever of the lock operating device of the caster of this invention are shown, (a) is the side view, (b) is the bottom view. The lock cam of the lock operating device of the caster of this invention is shown, (a) is the side view, (b) is the front view. The support cam of the lock operating device of the caster of this invention is shown, (a) is the side view, (b) is the top view. It is explanatory drawing which shows the unlocked state of the lock operation apparatus of the caster of this invention. It is explanatory drawing which shows the state which pressed the tire with the brake shoe of the lock operation apparatus of the caster of this invention. It is explanatory drawing which shows the locked state of the lock operation apparatus of the caster of this invention. It is explanatory drawing which shows the state immediately after unlocking of the lock operation apparatus of the caster of this invention. It is explanatory drawing which shows the first half state in the middle of lock release of the lock operation apparatus of the caster of this invention. It is explanatory drawing which shows the latter half state in the middle of lock release of the lock operation apparatus of the caster of this invention. It is a perspective view which shows the state with which the conventional lock operation apparatus of the caster was mounted | worn to the caster attached to base frames, such as a bed.

  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 of the present invention is mounted between two casters C at the front or rear of casters C attached to four corners of a base 1 such as a carriage. ing.

  The lock operating device according to the present invention is configured by rotating an operation bar B installed between two casters C attached directly to the base 1 or via an attachment plate (not shown). The brake shoe 2 fixed to both ends of the operation bar B is brought into a locked state by contacting the tire t of the caster C, and the brake shoe 2 is moved by returning the rotated operation bar B to the original state. The caster C is unlocked by being separated from the tire t.

  The operation bar B is a square pipe such as a square pipe as shown in the figure, and is easily fixed by being fitted into the square hole formed in the brake shoe 2 or step 3 described later. It is not something that can be done. The operation bar B passes through the main body frame 4 protruding below the base 1 in the middle part of the two casters C, and passes through the frames f of the two casters C. It is installed between the casters C so as to be rotatable.

  In the lock operating device according to the present invention, the main body frame 4 has a step 3, a lock lever 5, a lock cam 6 and a support cam 7 incorporated therein.

  As shown in FIGS. 4 to 6, the step 3 is fixed to the operation bar B via the return spring 8 so that the operation portion 3 a protrudes from the base 1. The return spring 8 is configured such that the coil portion 8a is wound around the operation bar B, the one end portion 8b is engaged with the main body frame 4, and the other end portion 8c is engaged with step 3, and the step 3 is returned. The spring is biased in the direction.

  As shown in FIGS. 4 and 5, the main body frame 4 is formed such that upper end attachment bodies 4 a and 4 a, both side face bodies 4 b and 4 b and a bottom face body 4 c are formed by folding back a plate-like body, and the front and rear are opened. . The upper end mounting bodies 4 a and 4 a are fixed to the base 1, and the main body frame 4 is projected below the base 1. Further, the step 3, the lock lever 5, the lock cam 6 and the support cam 7 are incorporated into the space S formed by the both side surfaces 4b and 4b and the bottom surface 4c from the front and rear openings.

  As shown in FIGS. 4 to 6, the lock lever 5 is provided with ratchet teeth 5a at the lower end of the plate-like body, and cam return pieces 5b are provided above the ratchet teeth 5a. The tip of step 3 is fixed. In the illustrated lock lever 5, a guide plate 9 is fixed to the side surface of the ratchet teeth 5a, and the cam return piece 5b is provided on the guide plate 9.

  As shown in FIGS. 4, 5, and 7, the lock cam 6 is provided with a slide projection 6b having a shaft hole 6a at a substantially central portion of the plate-like body, and an engaging claw 6c at a position above the shaft hole 6a. 6d, and the base end of the plate-like body is provided with a contact 6d with the stop body 4d provided on the main body frame 4. The shaft hole 6a is pivotally attached to the main body frame 4 and engaged. The claw 6c is engaged with the ratchet teeth 5a of the lock lever 5 in a stepwise manner so as to be freely fixed.

  As shown in FIGS. 4, 5, and 8, the support cam 7 is provided with a contact portion 7a for contact with the cam return piece 5b of the lock lever 5 at a substantially upper center portion of the plate-like body. A guide hole 7b having a long hole is provided below the shaft, and a shaft hole 7c provided at the base end of the plate-like body is pivotally attached to the main body frame 4 so that the lock cam 6 can slide in the guide hole 7b. The protrusion 6b enters, and the guide hole 7b moves along the slide protrusion 6b, so that the abutting portion 7a moves up and down within the range of the guide hole 7b.

  Further, as shown in FIGS. 4 and 5, release springs 10 for these cams are attached between the front end portion 6 e of the lock cam 6 and the front end portion 7 d of the support cam 7. The release spring 10 is configured such that one end 10a is hooked in a small hole 11 provided in the tip 6e of the lock cam 6 and the other end 10b is hooked in a small hole 12 provided in the tip 7d of the support cam 7. The tip portions 6e and 7d are inverted by up and down, and the tip portions 6e and 7d are spring-biased in a repulsive direction regardless of which of the tip portions 6e and 7d is up and down.

  Therefore, in order to place the caster C in the locked state by the lock operating device of the present invention, the operation unit 3a in step 3 is stepped on with the foot from the unlocked state shown in FIG. 3 (a) or FIG. 9 (a). When step 3 is rotated downward, the operation bar B is also rotated simultaneously, and the brake shoe 2 fixed to both ends of the operation bar B is also rotated downward to become the tire t of the caster C. Contact.

  In this case, the engaging claw 6c of the lock cam 6 meshes with the ratchet teeth 5a of the lock lever 5 fixed to the tip of the step 3 in a stepwise manner as shown in FIG. The degree of contact between the brake shoe 2 and the tire t of the caster C is adjusted. That is, if the force to step on the operation portion 3a of the step 3 with the foot is increased in accordance with the degree of wear of the tire t of the caster C and the ratchet teeth 5a and the engaging claws 6c are engaged more deeply, the tire Even when t is worn, the brake shoe 2 comes into contact with the tire t of the caster C. Regardless of the degree of wear of t of the tire, if the operation part 3a of step 3 is stepped strongly with a foot, the degree of contact of the brake shoe 2 with the tire t increases, and the operation part 3a of step 3 is stepped loosely with the foot. In this case, the degree of contact of the brake shoe 2 with the tire t becomes small, so that the strength of the caster C in the locked state can be adjusted according to the strength of the stepping force on the operation portion 3a of the step 3.

  When the brake shoe 2 comes into contact with the tire t of the caster C, the force of stepping on the operation part 3a of step 3 with a foot is loosened. Then, due to the action of the return spring 8, the step 3 is slightly rotated upward, the support cam 7 is rotated upward within the range of the guide hole 7 b, and the guide hole 7 b moves the slide projection 6 b of the lock cam 6. The state where the ratchet teeth 5a and the engaging claws 6c are engaged with each other is maintained, and the locked state is obtained as shown in FIG. 3B or FIG. 9C. When the support cam 7 is rotated upward, the tip 7d of the support cam 7 is above the tip 6e of the lock cam 6. Therefore, as shown in FIG. It will be reversed.

  Next, when the operation bar B is rotated by, for example, stepping on the operation portion 3a of the step 3 again from the locked state shown in FIG. 9C, the contact 6d of the lock cam 6 becomes the stopper 4d of the main body frame 4. The lock cam 6 is rotated until it hits, and the ratchet teeth 5a and the engaging claws 6c are disengaged as shown in FIG. 9 (d).

  Therefore, when stepping on the operating portion 3a in step 3 is stopped, the action of the return spring 8 causes step 3 to gradually return to the original state as shown in FIGS. 9 (e) and 9 (f). Will be. As the step 3 is returned to the original state, the cam return piece 5b of the lock lever 5 presses the contact portion 7a of the support cam 7, whereby the support cam 7 is also returned to the original position. . When the distal end portion 7d of the support cam 7 is below the distal end portion 6e of the lock cam 6, the release spring 10 is also reversed again as shown in FIG. The lock cam 6 also rotates so that the contact 6d of the lock cam 6 is separated from the stopper 4d of the main body frame 4 and returns to the original state as shown in FIG. 3 (a) or FIG. 9 (a). .

  As described above, the lock operating device of the present invention can be easily and reliably operated from the unlocked state to the locked state or from the locked state to the unlocked state.

  Furthermore, the caster lock operating device according to the present invention enables the two casters C to be operated by one lock operating device as described above, so that the lock operating device to be mounted per movable bed or cart is installed. The number of can be reduced.

  In addition, the caster lock operating device according to the present invention reduces the number of parts and facilitates the incorporation of each part, so that the assembling work does not take much time and the assembling work becomes simple.

DESCRIPTION OF SYMBOLS 1 Base 2 Brake shoes 3 Step 3a Operation part 4 Main body frame 5 Lock lever 5a Ratchet tooth 5b Cam return piece 6 Lock cam 6a Shaft hole 6b Slide protrusion 6c Engagement claw 7 Support cam 7a Abutting part 7b Guide hole 8 Return spring 10 Release Spring 11 Small hole 12 Small hole B Operation bar C Caster t Tire

Claims (2)

By rotating an operation bar (B) installed between two casters (C) attached to the base (1), the brake shoe (2) fixed to both ends of the operation bar (B) is By bringing the caster (C) into contact with the tire (t), the locked state is brought about, and the rotated operation bar (B) is returned to the original position so that the brake shoe (2) is moved to the caster (C). The caster lock operating device is brought into an unlocked state by being separated from the tire (t) of
In the middle part of the two casters (C), the operation bar (B) is penetrated through a main body frame (4) protruding below the base (1),
Step (3), lock lever (5), lock cam (6) and support cam (7) are incorporated in the main body frame (4),
The step (3) is fixed to the operation bar (B) via the spring (8) so that the operation part (3a) protrudes from the base (1),
The lock lever (5) is provided with ratchet teeth (5a) at the lower end, and a cam return piece (5b) is provided above the ratchet teeth (5a) at the tip of the step (3). Fixed,
The lock cam (6) is provided with a slide projection (6b) having a shaft hole (6a) at a substantially central portion, an engagement claw (6c) at a position above the shaft hole (6a), and a base end. It is assumed that a stop (4d) provided on the main body frame (4) has a contact (6d) and is rotatably attached to the main body frame (4), and an engaging claw (6c) is attached to the lock lever (5 ) And ratchet teeth (5a) so that they can be fixed in stages,
The support cam (7) is provided with a contact portion (7a) with the cam return piece (5b) of the lock lever (5) at a substantially upper center portion, and a long hole is formed below the contact portion (7a). The guide hole (7b) is provided so as to be pivotably attached to the main body frame (4), and the slide projection (6b) of the lock cam (6) enters the guide hole (7b), and the abutting portion ( 7a) moves up and down,
Furthermore, a release spring (10) is provided between the distal end portion (6e) of the lock cam (6) and the distal end portion (7d) of the support cam (7) to bias the distal end portions (6e, 7d) in a repulsive direction. casters lock operation apparatus characterized by is attached. The release spring (10) has one end (10a) hooked into a small hole (11) provided at the tip (6e) of the lock cam (6) and the other end (10b) of the support cam (7). 2. The caster lock operating device according to claim 1 , wherein the caster is turned upside down by being hooked in a small hole (12) provided in the tip (7d).

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