JP6985744B2 - Caster lock operation device - Google Patents

Description

The present invention relates to a caster lock operation device used by being attached to the bottom of a bed or a trolley.

Conventionally, as shown in FIG. 13, for example, as shown in FIG. 13, this type of caster lock operation device B is mounted on casters C attached to both ends of a pair of longitudinal frames 41a of a base frame 41 such as a bed. It is attached to at least one end of the operation bar 42 of the casters C, and the wheels 45 of the casters C are locked and unlocked by the rotation of the operation bars 42.

The operation bar 42 is provided between the casters C and C facing each other at both ends of the pair of longitudinal frames 41a of the base frame 41, and the operation bar 42 has a step S for rotating the operation bar 42. Is provided, and an interlocking rod 44 is hung between the operation bar 42 and the other operation bar 42 so that the rotation of one operation bar 42 is interlocked with the other operation bar 42.

As shown in FIG. 14, the conventional caster lock operation device B has the operation bar 42 penetrated through the through hole 46a formed in the upper part of the base plate 46 fixed to the caster C or the base frame 41. The cam 48 is fixed by returning to 42 and interposing a spring 47a.

Then, a switching gear 50 having a meshing tooth 50a with the tip claw 49a of the ratchet 49 and a pressing portion 50b with the uneven portion 51a of the lock / unlock lever 51 is provided at the lower portion of the base plate 46, and the fixing bolt 52 is provided. It is attached as rotatable by.

Further, the lock / unlock lever 51 is attached so as to be swingable by interposing a return spring 47c at the lower end of the base plate 46. The lock / unlock lever 51 has a substantially U-shape, one end of which is pivotally supported by the lower end of the base plate 46, and the other end of which the lock portion 51c is projected so as to be swingable on the base plate 46. It is assumed that it is attached, and that the concave-convex teeth 51a with the pressing portion 50b of the switching gear 50 are provided inside the center (Patent Document 1).

Japanese Patent No. 4103048

However, the conventional caster lock operation device B has a structure in which the switching gear 50 rotatably attached to the lower part of the base plate 46 is surrounded by a substantially U-shaped lock / unlock lever 51 from below. Therefore, the lock / unlock lever 51 becomes large, and the device itself becomes bulky, which makes it unattractive when used by attaching it to the bottom of a bed or a trolley, or the bottom of a bed or a trolley. In, there was a problem that it interfered with the turning of the caster C.

Therefore, the present invention has an object of solving the above-mentioned conventional problems, and by making the device itself low in bulk, it is unsightly when used by being attached to the bottom of a bed or a trolley. It does not become an obstacle, does not interfere with the turning of caster C at the bottom of the bed or trolley, and in some cases it can be incorporated into the frame of the bed or trolley, so that the device itself does not appear in the appearance, and more. It is made for the purpose of providing a lock operation device for casters that can be made more aesthetically pleasing.

Therefore, the caster lock operation device of the present invention is mounted on the caster C in which the wheels 5 are locked and unlocked by the rotation of the operation bar 2, and the base plate 6 fixed to the caster C or the base frame 1 is attached. The operation bar 2 is passed through the upper part of the cam 8, the return spring 7a is interposed in the operation bar 2 to fix the cam 8, and the return spring 7b is interposed in one end of the cam 8 to rotatably attach the ratchet 9. A lock portion 8c is provided at the other end of the cam 8, and a pressing portion between the meshing tooth 10a with the tip claw 9b of the ratchet 9 and the uneven portion 11a of the lock / unlock lever 11 is provided at the lower portion of the base plate 6. The switching gear 10 provided with the 10b is attached as rotatable, and the lock / unlock lever 11 is attached as swingable by interposing a return spring 7c in the vicinity of the switching gear 10 attached to the base plate 6. A lock portion 11d with the lock portion 8c of the cam 8 is projected from one end of the lock / unlock lever 11, and an uneven portion 11a with the pressing portion 10b of the switching gear 10 is provided at the other end. It is supposed to be.

Then, in the lock operation device of the caster of the present invention, the gear stopper 12 is swingably attached together with the lock / unlock lever 11 by interposing a return spring 7c in the vicinity of the switching gear 10 attached to the base plate 6. It is assumed that the gear stopper 12 is provided with a meshing portion 12c with the meshing teeth 10a of the switching gear 10.

Further, in the lock operation device of the caster of the present invention, the lock / unlock lever 11 has an abbreviated shape in a plan view.

Further, in the caster lock operation device of the present invention, a guide hole 13 is formed in a substantially central portion of the base plate 6, and a slide protrusion 8f projecting from the cam 8 is aligned with the guide hole 13. , The cam 8 is designed to rotate smoothly.

The caster lock operation device of the present invention is configured as described above, and the lock / unlock lever 11 can be made small, and the device itself becomes low in bulk, so that the bed or the trolley can be used. When attached to the bottom or the like, the appearance does not deteriorate, and the caster C does not interfere with the turning of the bed or the bottom of the trolley.

The caster lock operation device of the present invention can be incorporated into the frame of a bed or a trolley because the device itself is low in volume, and the device itself does not appear in the appearance, and the appearance is further improved. Can be good

It is a perspective view which shows the embodiment which attached the lock operation device of the caster of this invention to a caster attached to the base frame such as a bed. It is a perspective view of the lock operation device of the caster of this invention. It is an exploded perspective view of the lock operation device of the caster of this invention. It is a front view of the lock operation device of the caster of this invention. It is explanatory drawing which shows the operating state of the lock operation device of the caster of this invention. It is explanatory drawing which shows the operating state of the lock operation device of the caster of this invention. It is explanatory drawing which shows the operating state of the lock operation device of the caster of this invention. It is explanatory drawing which shows the stepping state of the step of the lock operation device of the caster of this invention shown in FIG. It is explanatory drawing which shows the operating state of the lock operation device of the caster of this invention. It is a partial fracture explanatory view of the caster in which the lock operation device of the caster of this invention is used. It is sectional drawing of the wheel of the caster shown in FIG. 10 in the unlocked state. It is sectional drawing of the wheel of the caster shown in FIG. 10 in the locked state. It is a perspective view which shows the form in which the lock operation device of the conventional caster is attached to the caster attached to the base frame such as a bed. It is a front view of the lock operation device of a conventional caster.

Hereinafter, embodiments of the caster lock operation device of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment in which the caster lock operation device A of the present invention is mounted on casters C attached to both ends of a pair of longitudinal frames 1a of a base frame 1 such as a bed, and at least one of these casters C. It is attached to one end of the operation bar 2.

The operation bar 2 is provided between casters C and C facing each other at both ends of a pair of longitudinal frames 1a of the base frame 1, and step S for rotating the operation bar 2 on one of the operation bars 2. Is provided, and an interlocking rod 4 is hung between the operation bar 2 and the other operation bar 2, so that the rotation of one operation bar 2 is interlocked with the other operation bar 2. The step S is provided at a position slightly closer to one side than the center of the operation bar 2, but is provided at a position significantly closer to any one side of the operation bar 2 even if it is just at the center of the operation bar 2. Alternatively, a plurality of operation bars 2 may be provided.

The caster lock operation device A of the present invention is mounted on the caster C in which the wheels 5 are locked and unlocked by the rotation of the operation bar 2, and as shown in FIGS. 2 to 4, the caster C is equipped. Alternatively, the operation bar 2 is passed through a through hole 6a formed in the upper part of the base plate 6 fixed to the base frame 1, and a return spring 7a is interposed in the operation bar 2 to fix the cam 8. The return spring 7a holds the winding portion on the tubular body 8a projecting from the upper part of the cam 8, one end thereof is locked to the protrusion 8b provided on the lower portion of the cam 8, and the other end portion is on the upper portion of the base plate 6. It is locked to the provided protrusion 6b. The illustrated operation bar 2 is a hexagonal bar, and the tubular body 8a of the cam 8 is easily fixed to the operation bar 2 by a bug screw (not shown), but the operation bar 2 is not limited to the hexagonal bar. No. A ratchet 9 is rotatably attached to one end of the cam 8 with a return spring 7b interposed therebetween, and a lock portion 8c is provided at the other end of the cam 8. The return spring 7b has a winding portion held by a shaft portion 8d projecting from the cam 8, one end thereof is locked to a protrusion 8e provided on the side portion of the cam 8, and the other end is provided on the upper portion of the ratchet 9. It is locked to the protrusion 9a.

Further, a shaft portion 6c projecting from the lower portion of the base plate 6 is provided with a meshing tooth 10a with the tip claw 9b of the ratchet 9 and a pressing portion 10b with an uneven portion 11a of the lock / unlock lever 11 described later. The switching gear 10 is rotatably attached. The meshing teeth 10a of the switching gear 10 have eight teeth, and the pressing portion 10b of the switching gear 10 has a cross shape and is projected in all directions. The meshing teeth 10a and the pressing portion 10b are switched. It is formed on the front and back of the gear 10.

Further, a return spring 7c is interposed in a shaft portion 6d projecting from the vicinity of the switching gear 10 attached to the base plate 6, and the lock / unlock lever 11 and the gear stop 12 are swung together with the lock / unlock lever 11. It is attached freely. The return spring 7c holds the winding portion on the shaft portion 6d, locks one end portion to the side end portion 11b of the lock / unlock lever 11, and engages the other end portion with the lower end portion 12a of the gear stopper 12. I'm stopping it. The lock / unlock lever 11 has an abbreviated shape in a plan view, and is attached so as to be swingable by inserting the shaft portion 6d into a through hole 11c formed in the intermediate portion, and the lock / unlock lever 11 is attached to one end thereof. It is assumed that the lock portion 11d with the lock portion 8c of the cam 8 is projected, and the concave-convex portion 11a with the pressing portion 10b of the switching gear 10 is provided at the other end portion. Further, the gear stopper 12 has a substantially key hole shape in which a part of a square is overlapped under the circle in a plan view, and the shaft portion 6d is inserted into the through hole 12b formed in the circular portion. It is attached so as to be swingable, and a meshing portion 12c with the meshing tooth 10a of the switching gear 10 is provided at the corner end of the square portion.

Further, a guide hole 13 is formed in a substantially central portion of the base plate 6, and a slide protrusion 8f projecting from the vicinity of the shaft portion 8d of the cam 8 is aligned with the guide hole 13 so that the cam is formed. 8 is designed to rotate smoothly.

Reference numeral 14 in the drawing is a washer for preventing each member from coming off or loosening from each shaft portion. Further, reference numeral 15 is a screw hole for attaching the base plate 6 to the longitudinal frame 1a or the like of the base frame 1.

As shown in FIGS. 10 to 12, the casters C rotatably attach wheels 5 to a frame 22 rotatably attached to the lower portion of a support shaft portion 21. The support shaft portion 21 is provided with an operation pin 24 that can be moved up and down in the vertical direction so that the operation bar 2 is horizontally arranged above the operation pin 24 and the lower portion of the support shaft portion 21. The engagement gear 26 is fixed to the. A braking arm 27 is pivotally supported inside the frame 22. Further, an engaging gear 28 is fixed to the outer periphery of the support pin 5a of the wheel 5.

The operation bar 2 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 constantly pressed upward by the spring 30 mounted on the spring chamber 21b 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 the adjusting bolt 31 screwed into the braking arm 27. The tip of the support shaft braking body 33 that rotates coaxially with the braking arm 27 via the return spring 32 is freely engaged and disengaged with the engaging teeth 26a of the engaging gear 26. Further, the engaging end 34a of the wheel braking body 34 attached to the lower part of the braking arm 27 is freely engaged and disengaged with the engaging teeth 28a of the engaging gear 28.

Therefore, in order to lock the wheels 5 of the caster C by the lock operation device A of the present invention, as shown in FIG. 1, a step S provided on one of the operation bars 2 is stepped on with a foot or the like. When the operation bar 2 is rotated, the other operation bar 2 is rotated by the interlocking rod 4.

Then, the cam 8 fixed to the operation bar 2 rotates, and as shown in FIG. 5, the tip claw 9b of the ratchet 9 rotatably attached to the cam 8 from the state shown in FIG. 4 is the base plate. It corresponds to the meshing teeth 10a of the switching gear 10 attached to the lower part of No. 6 so as to be rotatable. Further, as shown in FIG. 6, from the state shown in FIG. 5, the switching gear 10 rotates, the tip claw 9b of the ratchet 9 and the meshing tooth 10a of the switching gear 10 mesh with each other, and the switching gear 10 rotates. By fitting the uneven portion 11a of the lock / unlock lever 11 swingably attached to the lower end of the base plate 6 into the pressing portion 10b of the gear, the lock portion 11d at one end of the lock / unlock lever 11 is fitted. Rotates inward. At this time, the tooth portion 12c of the gear stopper 12 is meshed with the meshing tooth 10a of the switching gear 10 by the return spring 7c, and the rotation of the switching gear 10 is prevented.

In this state, when the foot is released from step S, the cam 8 is returned by the return spring 7a as shown in FIG. 7 from the state shown in FIG. 6, and the lock portion 8c of the cam 8 is unlocked. By hitting the lock portion 11d of the lock lever 11 and stopping, the operation bar 2 also stops at the rotation position.

Then, in the caster C, as shown in FIG. 12, the contact between the cam 29 and the upper end of the operation pin 24 is on the major axis side of the cam 29, and the operation pin 24 overcomes the pressing force of the spring 30 and is pushed down. do. Then, as the operation pin 24 is lowered, the lower end of the operation pin 24 pushes down the adjustment bolt 31, so that the braking arm 27 overcomes the pressing force of the return spring 32 and rotates, and rotates coaxially with the braking arm 27. The tip of the support shaft braking body 33 engages with the engagement teeth 26a of the engagement gear 26 fixed to the lower part of the support shaft portion 21, and the turning of the frame 22 is locked. Further, due to the rotation of the braking arm 27, the engaging end 34a of the wheel braking body 34 attached to the braking arm 27 engages with the engaging teeth 28a of the engaging gear 28 fixed to the support pin 5a of the wheel 5, and the wheel. 5 is locked.

Further, in order to change the wheel 5 from the locked state to the unlocked state, as shown in FIG. 8, the operation bar is stepped on by stepping the step S provided on one of the operation bars 2 again. When 2 is rotated, the other operation bar 2 is also rotated by the interlocking rod 4.

Then, the cam 8 fixed to the operation bar 2 rotates, the lock portion 8c of the cam 8 rises, and the tip claw 9a of the ratchet 9 hits the meshing teeth 10a of the switching gear 10. The switching gear 10 rotates, the pressing portion 10b of the switching gear 10 is disengaged from the uneven portion 11a of the lock / unlock lever 11 and pushed up, and the lock portion 11d of the lock / unlock lever 11 rotates outward.

In this state, when the foot is released from step S, the lock portion 8c of the cam 8 passes through the lock portion 11d as shown in FIG. 4 from the state shown in FIG. 9, and the cam 8 returns the spring 7a. By returning by, the operation bar 2 rotates in the reverse direction and stops at that position.

Then, in the caster C, as shown in FIGS. 10 and 11, the contact between the cam 29 and the upper end of the operation pin 24 is on the short diameter side of the cam 29, and the operation pin 24 is pushed by the spring 30 and rises. .. Then, as the operation pin 24 rises, the braking arm 27 and the support shaft braking body 33 rotate due to the pressing force of the return spring 32 to return to the original state, and the tip of the support shaft braking body 33 is the support shaft portion 21. The engagement gear 26 is disengaged from the engagement tooth 26a fixed to the lower portion of the frame 22, and the rotation of the frame 22 is released. Further, since the braking arm 27 rotates and returns to the original state, the engaging end 34a of the wheel braking body 34 attached to the braking arm 27 engages with the engaging gear 28 fixed to the support pin 5a of the wheel 5. The wheel 5 is unlocked after being separated from the tooth 28a.

1 Base frame 2 Operation bar 5 Wheels 6 Base plate 7a Return spring 7b Return spring 7c Return spring 8 Cam 8c Lock part 8f Slide protrusion 9 Ratchet 9b Tip claw 10 Switching gear 10a Meshing tooth 10b Pushing part 11 Lock unlock lever 11a Uneven part 11d Lock part 12 Gear stop 12c Mating part 13 Guide hole C Caster

Claims (4)

It is a lock operation device equipped on the caster (C) that locks and unlocks the wheel (5) by the rotation of the operation bar (2).
The operation bar (2) is passed through the upper part of the base plate (6) fixed to the caster (C) or the base frame (1), and the return spring (7a) is interposed in the operation bar (2) to intervene the cam (8). Stick,
A ratchet (9) is rotatably attached to one end of the cam (8) with a return spring (7b) interposed therebetween, and a lock portion (8c) is provided at the other end of the cam (8).
A pressing portion (10b) between the meshing tooth (10a) with the tip claw (9b) of the ratchet (9) and the uneven portion (11a) of the lock / unlock lever (11) on the lower portion of the base plate (6). The switching gear (10), which is installed side by side with, is attached so that it can rotate.
A return spring (7c) is interposed in the vicinity of the switching gear (10) attached to the base plate (6) to allow the lock / unlock lever (11) to swing freely, and the lock / unlock lever (11) is attached. It is assumed that the lock portion (11d) with the lock portion (8c) of the cam (8) is projected from one end portion, and the uneven portion (10b) with the pressing portion (10b) of the switching gear (10) is provided at the other end portion. A caster lock operation device characterized in that 11a) is provided. A return spring (7c) is interposed near the switching gear (10) attached to the base plate (6), and a gear stopper (12) is attached together with the lock / unlock lever (11) so as to be swingable. The caster lock operation device according to claim 1, wherein the (12) is provided with a meshing portion (12c) with the meshing teeth (10a) of the switching gear (10). The caster lock operation device according to claim 1 or 2, wherein the lock / unlock lever (11) has an abbreviated shape in a plan view. A guide hole (13) is formed in a substantially central portion of the base plate (6), and the slide protrusion (8f) projecting from the cam (8) is aligned with the guide hole (13). The caster lock operation device according to any one of claims 1 to 3, wherein the cam (8) is made to rotate smoothly.

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