JP2015037907A - Caster with rotation lock mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a caster with a rotation lock mechanism having a double lock function capable of simultaneously performing rotation stop of a caster body and brake (rotation stop) of a wheel.SOLUTION: The caster, in which a wheel is attached to the caster body pivoted by a caster bracket, includes a rotation lock mechanism composed of: a disk-shaped lock plate which is attached integrally with the caster bracket and has a recess for lock; a rotation lock pin held by a spring for wheel lock so as to be recess/projection-engaged with the recess for lock; a spring for caster lock for making the rotation lock pin recess/projection-engaged with the lock plate; and an operation lever energized with a rotation force in the constant direction by the spring for wheel lock. In the rotation lock mechanism, when the operation lever is rotated to the lower side, the rotation lock pin is recess/projection-engaged with the lock plate to stop the rotation of the caster body, and simultaneously the spring for wheel lock presses the wheel to stop the rotation of the wheel.

Description

  The present invention relates to a caster with a rotation lock mechanism, and more particularly to an improvement of a caster with a rotation lock mechanism having a double lock function capable of simultaneously stopping turning of a caster body and braking (rotation stop) of a wheel. is there.

  As is well known, a wheel is rotatably supported on a caster body via an axle, and a support shaft that is vertically provided at a position eccentric to the axle of the caster body is pivotally attached to a caster bracket or the like. In general, the caster body is used as a free wheel that can freely rotate around the support shaft and rotate in the arbitrary direction as the wheels rotate. This type of caster is already known in which a locking device that performs both braking (rotation stop) of the wheel and rotation stop of the caster body in consideration of safety and the like is provided (for example, Patent Documents). 1, see Patent Document 2).

  The caster described in Patent Document 1 is interposed between the caster body and the mounted body, and is fixed to the mounted body side and fixed to the mounted body, and is supported by the positioning fixed member so as to be movable up and down. One of the operating means for moving the first engaging means up and down, and the second engaging means that can be engaged with the first engaging means that is provided on the caster body and supported by the positioning fixing member, And an elastic body that supports the engaging means so as to be retractable, and includes a turning lock device that restricts the turning of the caster body in the horizontal direction when the engaging means are engaged with each other.

  The caster described in Patent Document 2 includes a turning lock member that is supported by the caster body so as to be movable up and down, a spring that constantly biases the turning lock member downward, and an operation member that raises the turning lock member. And a lock plate that is fixed to the mounted body side and that is formed with an engagement portion for turning lock that engages when the turning lock member is lifted, and is detachably attached to the turning lock member, and is integrated with the turning lock member. A wheel lock member that moves up and down automatically, and a wheel side brake portion that is formed on the wheel and engages with a brake portion provided on the wheel lock member when the wheel lock member is lifted to stop the traveling of the wheel Provided with a locking device.

Japanese Patent Laid-Open No. 7-69002 JP-A-7-132704

  However, in each of the above conventional casters with a lock device, there is a problem that not only the lock device has a complicated mechanism and the cost is high, but also the entire caster is enlarged.

  The present invention has been made in order to solve the above-described problems. The rotation lock mechanism has a simple structure and is inexpensive, and can always obtain a stable operation and is excellent in performance. An object of the present invention is to provide a caster with a rotation lock mechanism having a double lock function capable of simultaneously stopping turning of a caster body and braking (rotation stop) of a wheel.

  A caster with a rotation lock mechanism according to the present invention is a caster in which a caster main body is pivotally supported by a caster bracket fixed to an attached body, and a wheel is rotatably supported by the caster main body. A disc-shaped lock plate that is attached integrally with the caster bracket between the caster bracket and the caster main body and has a large number of locking recesses on the circumferential end surface facing the caster main body, and the lock plate A swivel lock pin that is located below the lock recess and has a convex portion that can be engaged with the concave and convex portions, and that is vertically supported by a wheel lock spring mounted on the caster body, and a vertical movement on the caster body. It is pivotally mounted in the direction of rotation and is clamped and fixed by the wheel locking spring so that it is always rotated upward. An operation lever (lock lever) provided with a caster lock spring that is energized and raises the swivel lock pin against the wheel lock spring. When the operation lever is rotated downward, The turning lock pin is raised to engage with the lock plate to stop the turning of the caster body, and at the same time, the wheel locking spring presses the wheel to stop the turning of the wheel. A rotation lock mechanism is provided.

  According to the present invention, it is possible to simultaneously stop and release the rotation of the caster body and stop and release the rotation of the wheel by only rotating the operation lever (lock lever) up and down. Locking and unlocking can be performed easily and quickly, and the main components of the locking mechanism are disc-shaped lock plates and lock pins, two types of springs for caster locks and wheel locks, and an operating lever ( By adopting the lock lever), not only stable operation is always obtained with a simple configuration, but also the rotation lock mechanism can be made compact without increasing the size of the caster body, so a high-performance rotation lock mechanism The caster with a rotation lock mechanism according to the present invention can be provided at a low cost. Because structure and the wheel lock mechanism is in the removable, it or remove the lock pin and the lock spring if necessary, it is possible or assembled, excellent effects and the like.

It is a side view which shows a caster with a rotation lock mechanism concerning a 1 embodiment of the present invention, and shows a caster main part and a stationary release state of a wheel. It is a front view of a caster same as the above. It is a reverse view which expands and shows the lock plate of a caster same as the above. It is a figure which expands and shows the rotation lock pin of a caster same as the above, (A) is a perspective view, (B) is a longitudinal cross-sectional view. It is a figure which expands and shows the operation lever (lock lever) of a caster same as the above, (A) is a perspective view, (B) is a longitudinal cross-sectional view. It is a perspective view which expands and shows the wheel lock spring which clamps and locks a wheel lock and an operation lever (lock lever) of the same caster. It is operation | movement explanatory drawing of a caster same as the above, and is a partially broken side view which shows the stationary state of a caster main body and a wheel.

  1 to 7, the caster with a rotation lock mechanism according to the present invention has a caster main body 1 mounted on a caster bracket 10 fixed to an attached body (not shown). And a caster bracket 10 and a caster body in a configuration in which the wheel 3 is pivotally supported by the caster body 1 via an axle 4 while being pivotally supported by the caster body 1 in a horizontal direction via a fastening nut 2-1. 1, a disc-shaped lock plate 5, a swivel lock pin 6 provided on the caster body 1 so as to be movable up and down, an operation lever (lock lever) 7, a caster lock spring 8, and a wheel lock spring 9. A rotation lock mechanism is provided.

  As shown in FIGS. 1 and 3, the disc-shaped lock plate 5 provided between the caster bracket 10 and the caster main body 1 is one of the main components of the rotation lock mechanism of this embodiment. A circle having a plurality of recesses 5-3 for locking at equal intervals in the circumferential direction on the circumference end surface of the back surface facing the caster body 1 and concentric with the shaft hole 5-2. A shaft hole 5-2 is formed in a vertical shaft (spinning shaft pin) 2 projecting from the upper surface of the caster body 1 and comprising a plate portion 5-1 and a mounting plate portion 5-4 projecting from the disk portion. And the mounting plate portion 5-4 is fixed to the caster bracket 10 with screws 5-5 so as to rotate integrally with the caster bracket 10 about the vertical shaft 2. ing. 5-6 is a screw hole.

  A turning lock pin 6 that engages with the lock plate 5 to stop and release the turning of the caster in the horizontal direction is an arc shape concentric with the locking recess 5-3 of the lock plate 5 as shown in FIGS. A convex portion 6-3 is formed on the upper portion of the wide width portion 6-1 to be engaged with the locking concave portion 5-3 of the lock plate 5, and below the narrow width portion 6-2. A spring hole 6-4 through which a caster lock spring 8 attached to the operation lever (lock lever) 7 passes is provided, and the turning lock pin 6 is placed at the boundary between the wide portion 6-1 and the narrow portion 6-2. A locking portion 6-5 of a wheel locking spring 9 that is held at a predetermined height position of the caster body 1 is formed. In addition, although the case where the three convex parts 6-3 formed in the turning lock pin 6 were formed here was shown, it cannot be overemphasized that this convex part 6-3 may be one piece instead of a plurality.

  The wheel lock spring 9 is made of a plate-like metal plate bent in a substantially V shape as shown in FIGS. 1 and 6, and the swivel lock pin 6 is moved up and down on the upper surface portion 9-1 of the metal plate. A window hole 9-3 for penetrating and supporting is possible, a window hole 9-4 for penetrating the lower part of the turning lock pin 6 on the lower surface portion 9-2, and a lower end portion of the lower surface portion for bending a wheel. It has a wheel pressing part 9-5. As shown in FIG. 1, the wheel locking spring 9 is attached to the caster body 1 with a screw pin 9-6 so that the upper surface portion 9-1 and the lower surface portion 9-2 are biased inward in the inner direction. It is attached in the vertical direction. In the turning lock pin 6, the upper surface portion 9-1 of the wheel locking spring 9 is engaged with the engaging portion 6-5 of the turning lock pin, and the three convex portions 6-3 are used to lock the lock plate 5. The concave portion 5-3 is supported so as to be vertically movable at the position where the concave and convex portions are fitted.

As shown in FIGS. 1 and 5, the operation lever (lock lever) 7 has a hollow inside, and has a protruding portion 7-1 at the lower end portion on the caster body side and a spring locking hole 7- in the vicinity of the protruding portion. The caster lock spring 8 is mounted inside a lever body made of a rectangular body having the same width as that of the wheel lock spring 9 and has a mounting portion 7-3 formed on the upper end of the caster body. The caster body 1 is attached to the caster body 1 so as to be pivotable in the vertical direction by a screw pin 7-4, and the protruding portion 7-1 and the mounting portion 7-3 are clamped by the wheel lock spring 9. Therefore, the turning force in the upward direction (counter-hour hand direction) is always energized. The caster lock spring 8 housed in the operation lever 7 has a tip 8-1 that fits into a spring hole 6-4 provided in a lower portion of the narrow width portion 6-2 of the turning lock pin 6. It protrudes from the inner side end, and the rear end is fitted and fixed in a locking hole 7-2 provided on the bottom side of the lever body. 7-5 is a screw hole.
In other words, the operating lever 7 is attached so as to be pivotable in the vertical direction with the screw pin 7-4 as a fulcrum, and is usually clamped and fixed by the wheel lock spring 9 as shown in FIG. When the operation lever 7 is rotated downward from this state, the turning lock pin 6 is lifted by the tip 8-1 of the caster lock spring 8 mounted inside the lever body. At the same time that the caster main body 1 stops turning by engaging the lock plate 5 with the concave and convex portions, the wheel pressing portion 9-5 of the wheel locking spring 9 is pressed by the projecting portion 7-1 formed on the operation lever 7. This is a mechanism for stopping (braking) the rotation of the wheel 3. When the operation lever 7 is rotated downward, the caster is held such that the turning of the caster and the rotation of the wheel are locked by the caster lock spring 8 and the wheel lock spring 9, respectively. Needless to say, the main body 1 is pivotally attached.

  In the caster with the rotation lock mechanism having the above-described configuration, when the caster can be freely turned and the wheel 3 is used in a free state, the operation lever 7 is moved upward as shown in FIG. Let me. At this time, the turning lock pin 6 supported by the tip 8-1 of the caster lock spring 8 is lowered into the caster body 1, and the convex portion 6-3 of the turn lock pin 6 is integrated with the caster bracket 10. Since the caster body 1 and the caster bracket 10 are free from each other because they are separated from the lock recess 5-3 of the lock plate 5, the operation lever 7 is provided on the lower surface 9-2 of the wheel lock spring 9. Therefore, the wheel pressing portion 9-5 is separated from the wheel 3 and the wheel 3 is also free.

  On the other hand, when the rotation of the caster body 1 and the rotation of the wheel 3 are locked, the operation lever 7 positioned above is pushed downward against the wheel lock spring 9 as shown in FIG. At this time, the turning lock pin 6 is lifted by the tip 8-1 of the caster lock spring 8 mounted inside the operation lever, and the three protrusions 6-3 of the lock pin are the lock recesses of the lock plate 5. 5-3 to immediately stop the turning of the caster body 1 and at the same time, the wheel pressing portion 9-5 of the wheel lock spring 9 is pressed by the protruding portion 7-1 formed on the operation lever 7, and the wheel 3 Stop (brake) the rotation. In this way, regardless of the position of the caster body 1 during turning, the turning of the caster body 1 and the rotation of the wheels 3 are securely locked while rotating the maximum 360 degrees by simply depressing the operation lever 7 downward. be able to. When the caster body 1 and the wheels 3 are brought into a free state from the state in which the turning of the caster body 1 and the rotation of the wheels 3 are locked, the operation lever 7 is pushed upward. At this time, as the operation lever 7 is instantaneously turned upward by the urging force of the wheel lock spring 9, the turning lock pin 6 held at the rising position by the tip 8-1 of the caster lock spring 8. Is lowered, and the convex portion 6-3 of the turning lock pin 6 is detached from the locking concave portion 5-3 of the lock plate 5 and is immersed in the caster main body 1 and supported by the wheel lock spring 9, whereby the caster main body 1 becomes free, and at the same time, the wheel pressing portion 9-5 of the wheel locking spring 9 is separated from the wheel 3, and the wheel 3 is also free (FIG. 1).

As described above, the caster with the rotation lock mechanism according to the present embodiment can lock and release the caster body 1 and the wheel 3 at the same time only by rotating the operation lever (lock lever) 7 up and down. The caster body 1 and the wheel 3 can be locked and released easily and quickly, and the main components of the lock mechanism are the disk-shaped lock plate 5 and the turning lock pin 6, for the caster lock and for the wheel lock. By adopting the two types of springs 8 and 9 and the operation lever 7, not only stable operation is always obtained with a simple configuration, but the size of the caster is increased by making the rotation lock mechanism compact. Can be prevented.
In the present embodiment, the caster main body 1 is pivotally supported on the caster bracket 10, but the caster main body 1 may be directly attached to an attachment body such as furniture without the caster bracket 10. Needless to say, it is good.

DESCRIPTION OF SYMBOLS 1 Caster body 2 Vertical shaft 2-1 Tightening nut 3 Wheel 4 Axle 5 Lock plate 5-1 Disc part 5-2 Shaft hole
5-3 Recessed part for locking 5-4 Mounting plate part 5-5 Screw 5-6, 7-5 Screw hole 6 Rotating lock pin 6-1 Wide part 6-2 Narrow part 6-3 Convex part 6-4 Spring hole 6-5 Locking part 7 Operation lever (lock lever)
7-1 Protruding part 7-2 Spring locking hole 7-3 Mounting part 7-4 Screw pin 8 Caster lock spring 8-1 Tip part 9 Wheel lock spring 9-1 Top face part 9-2 Bottom face part 9-3 , 9-4 Window hole 9-5 Wheel pressing part 9-6 Screw pin 10 Caster bracket

Claims (1)

  In a caster in which a caster main body is pivotally supported by a caster bracket fixed to an attached body and a wheel is rotatably supported by the caster main body, between the caster bracket and the caster main body, A disk-shaped lock plate attached to the caster bracket and having a large number of locking recesses on the circumferential end surface of the back surface facing the caster body, and positioned below the lock plate, A swivel lock pin having a convex part that can be engaged with the concave and convex parts and supported so as to be vertically movable by a wheel locking spring mounted on the caster body; It is clamped and fixed by a wheel lock spring, and the turning force in the upward direction is always urged. It is composed of an operation lever with a caster lock spring that is lifted against the lock spring, and when the operation lever is rotated downward, the swivel lock pin is raised to engage with the lock plate. And the rotation of the caster body is stopped, and at the same time, the wheel lock spring presses the wheel to stop the rotation of the wheel. .

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