JPH0228757Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a locking mechanism for a movable shelf that can be moved by rotating a handle provided on the side wall of the shelf.

[Conventional technology]

In handle-type movable shelves, each shelf can be freely moved by rotating the handle, so a locking mechanism is provided for safety reasons.

This is because, for example, when a worker is between the shelves to take in and take out stored items, it is dangerous if the shelf is moved by another worker. For this reason, various types of locking mechanisms have been proposed and put into practical use as locking mechanisms, but in principle, the locking mechanism consists of a rotating member that forms a transmission mechanism for transmitting the rotation of the steering wheel to the running wheels. For example, in most cases, a lock rod is engaged with a handle shaft sprocket, an intermediate sprocket, a wheel axle sprocket, etc., or an equal lock rod is fitted into a lock hole of a separate rotating member coaxially with each of the above-mentioned sprockets. It is.

The above method uses, for example, a mechanism that swings or rotates the operating lever or knob of the lock mechanism, and converts this swing (angular rotation) or rotational movement into forward and backward (linear) movement of the rod through an interlocking link made of a rigid body. Many things are now being done.

[Problem that the invention attempts to solve]

However, in the conventional locking mechanism, the locking rod engages with the tooth groove of the rotating member of the transmission mechanism for moving the shelf, such as the sprocket, so while it has the advantage of providing a reliable locking function, If the advancing rod does not fit between the teeth of the sprocket, there is a problem that the operating lever or knob will not move.

Also, in such a case, the rod cannot be locked unless it gets between the teeth, so move the shelf slightly by pushing it forward a little, rotate the teeth of the sprocket a little, and move the operating lever or handle. There is also the hassle of having to operate it.

[Means for solving problems]

The present invention was made with the purpose of providing a locking mechanism that can solve the problems of the conventional locking mechanism as described above, and also takes into account the convenience of assembly. A locking rod is provided in a position where the tip side can move up and down against the teeth at the center of the lower half of the handle shaft sprocket on which the handle shaft sprocket is hung, and the locking rod is placed on the same axis as the locking rod and is urged upward when the locking rod is locked. A spring that biases downward when the lock is released and a spring located below the spring that biases the lock lock only downward are provided, and a locking operation knob or lever is provided on the lower end side of the lock lock. The present invention is characterized in that a transmission mechanism is connected to store the momentum of rotational motion in both springs and convert it into linear motion of the lock rod.

[Effect of invention]

The rotational angular movement of the operating knob or lever is stored as compressive force in the spring and converted into linear movement of the rod, so even if the tip of the rod hits the teeth of the sprocket and does not fit between the teeth, The rotational movement of the operating knob lever itself is not blocked. Furthermore, since the compressive force of this spring automatically advances the rod, it is possible to lock the sprocket by slightly moving the teeth of the sprocket without having to operate a knob or the like again.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Figures 1 and 2 show an example of the present invention.
The locking mechanism is mounted below the sprocket of the handle shaft on the side wall (not shown) of the mobile shelf.

Therefore, 1 is the mounting plate of the lock mechanism of the present invention,
It is attached below the sprocket DS on the side wall of the movable shelf. Reference numeral 2 is a lock rod receiving plate with a U-shaped side surface attached to the upper part of the mounting plate 1, and sleeves 2a are inserted into holes provided in the upper and lower protruding pieces.
The lock rod 3 is loosely inserted into the sleeve 2a.

The lock rod 3 is shaped so that its upper end 3a can easily fit between the teeth of the sprocket DS.

Further, a locking ring 3b for locking a connecting spring 6, which will be described later, is fixedly attached to the lower end side of the rod 3.

Reference numeral 4 denotes an intermediate bearing plate with a substantially U-shaped side surface provided below the lower end of the lock rod 3 on the mounting plate 1; 5 an intermediate shaft fitted into a hole formed in a protruding piece of the support plate 4; A locking ring 5 similar to the one provided at the lower end of the lock rod 3 above is provided on the upper part of the shaft 5.
a is installed.

The lower end of the rod 3 and the upper end of the shaft 5 are elastically connected to each other via the spring 6 by fixing both ends of the spring 6 to the locking rings 3b and 5b of the rod 3 and the upper end of the shaft 5. ing.

Reference numeral 7 designates a camshaft mounting plate in the form of a flat opening mounted below the mounting plate 1. A cam plate 8 is mounted on the tip of the camshaft mounting plate 7, and an operating knob or handle (not shown) for the locking mechanism is mounted on the rear end. ) is attached to the camshaft 9, which is rotatably mounted in a horizontal position.

The tip of the cam plate 8 is connected to the lower end of the intermediate shaft 5 by a connecting rod 10, so that the cam plate 8 assumes a horizontal position when not locked.

Therefore, in the intermediate shaft 5, a spring 11 is provided between the lower surface of the receiving plate 4 and the upper surface of the connecting rod 10.
is inserted. This spring 11 has the role of maintaining and ensuring the posture (substantially vertical) of the cam plate 8 when the lock is locked, and also of promoting the downward movement of the rod 3 and the shaft 5 when the lock is released.

Next, the operation of an example of the locking mechanism of the present invention constructed as described above will be explained.

When the lock is released, the rod 3 and the intermediate shaft 5 are in the position shown by the solid line in the figure, the cam plate 8 is tilted 90 degrees, and the springs 6 and 11 are also in an expanded state.

To lock the camshaft 9, turn a "knob" or "lever" (not shown) clockwise in FIG. 1 to rotate the camshaft 9 approximately 90 degrees.

The rotation of the shaft 9 causes the cam plate 8 to stand up and move the intermediate shaft 5 upward via the connecting rod 10. Note that the spring 11 is compressed at this time.

When the intermediate shaft 5 moves upward, this stroke motion is transmitted to the lock rod 3 via the spring 6, and the tip 3a of the rod 3 is connected to the sprocket DS.
Fits between the teeth of the sprocket DS and prevents rotation of the sprocket DS.

When the rod 3 moves upward, even if its tip 3a hits the teeth of the sprocket and its upward movement is blocked, the upward movement of the intermediate shaft 5 is not blocked.

In such a case, the spring 6 is attached to the intermediate shaft 5.
This is because it is compressed with the upward movement of .

Therefore, even if the intermediate shaft 5 reaches the upper moving end, the repulsive force of the compressed spring 6 acts on the locking rod 3, so the sprocket DS only moves slightly due to this repulsive force. Or, if the rod 3 is loose with the sleeve 2a,
The rod 3 enters between the teeth of the sprocket. Therefore, this locking mechanism can perform a reliable locking operation.

A locking mechanism that performs a reliable locking operation as described above can also be obtained by another embodiment of the present invention shown in FIGS. 3 and 4.

In the mechanism of this embodiment, a lock rod receiving plate 2 is formed in a slightly larger size, and a lock rod 31 is inserted therein, in which the lock rod 3 and intermediate shaft 5 of the previous embodiment are formed into one rod.

Further, a spring receiving pin 12 is provided in the middle of the lower half of the rod 31, and a longitudinal groove 13 is formed at the lower end, and a retaining pin 14 is fixed to the lower end of the groove 13. A spring seat 15 is loosely inserted above the pin 14 so as to be slidable along the rod 31.

Therefore, on the lower half side of the rod 31,
Between the lower surface of the lower protruding piece of the receiving plate 2 and the upper surface of the spring receiving pin 12, there is a spring 11a that acts on the retreating side (downward side) of the rod 3.
A buffer spring 6a is inserted between the lower surface of the pin and the upper surface of the catch seat 15 to constitute another embodiment of the locking mechanism of the present invention.

In addition, in these figures 3 and 4, figures 1 and 2
The same reference numerals as in the figures indicate the same members.

In FIGS. 3 and 4, the position of the locking rod 31 indicated by a solid line indicates an unlocked state in which the tip 31a thereof is not fitted between the teeth of the sprocket DS.

Now, turn the control knob etc. (not shown) clockwise.
When rotated 90 degrees, the plate cam 8 stands up at the position indicated by the chain line in FIG.

When the plate cam 8 stands up, the leading end of the connecting rod 10 slides upward within the groove 13 at the lower end of the rod 31 and acts to compress the spring 6a via the seat 15.

The spring 6a that receives the compressed force acts to push the spring receiving pin 12 upward at its upper end, so the locking rod 31 that holds this pin 12 overcomes the repulsive force of the spring 11a and rises. However, the tip of this rod 31 fits between the teeth of the sprocket DS, resulting in a locked state.

In the above-mentioned lifting operation of the lock rod 31, even if its tip 31a does not fit between the teeth of the sprocket DS and hits the tooth surface etc., preventing the rod from rising, the shaft 9 of the operating knob etc. can always be rotated 90 degrees, which means a lock operation has been performed. This is a connecting rod 10 that converts this rotational motion into linear motion when the plate cam 8 rotates 90 degrees and stands up.
The tip of the spring 6a is inserted into the groove 13 of the rod.
This is because it slips while being compressed.

In such a case, the repulsive force of the compressed and stored spring 6a acts as a force to move the rod 31 upward, so if the sprocket DS moves slightly or the tip side of the rod 31 shakes a little, the relevant Rod 31 can now fit between the teeth of sprocket DS.

The present invention is as described above, and converts the rotational movement of the operating knob or lever of the lock mechanism into linear movement through a connecting structure that has a buffering and force storage function.
Since the rod as a locking member is operated, even if the tip of the rod hits the tooth surface of the sprocket and cannot advance, the locking operation of the operation knob etc. can be completed completely, and this movement is stored in the spring, and even a stopped lock rod can be instantly inserted between the teeth by the action of the slight movement of the sprocket, etc., the slight movement of the rod itself, and the stored repulsive force, resulting in moderate locking operation and reliable locking. It has the unique effect of being able to perform its functions. In particular, if the rod tip does not fit between the teeth, even if the shelf tries to move due to an earthquake, etc., the rod tip will move upward due to the repulsive force stored in the spring and enter between the teeth, causing the shelf to move. It is safe because it prevents

[Brief explanation of the drawing]

FIG. 1 is a front view of an example of the mechanism of the present invention, FIG. 2 is a right side view, FIG. 3 is a front view of another example, and FIG. 4 is a right side view. DESCRIPTION OF SYMBOLS 1... Mounting plate of the lock mechanism, 2... Lock rod receiving plate, 3... Lock rod, 4... Intermediate bearing plate, 5... Intermediate shaft, 6... Connection spring, 7...
...Camshaft mounting plate, 8...Plate cam, 9...Camshaft,
10...Connecting rod, 11...Spring.

Claims (1)

[Scope of utility model registration request] A locking rod is provided in a position in which the tip side can move up and down against the teeth at the center of the lower half of the handle shaft sprocket on which the chain is wound around on the upper half, and the locking rod is locked on the same axis as the locking rod. A spring that is biased upward when the lock is released and a spring that biases the lock lock downward when the lock is released, and a spring that is located below the spring and biases the lock rod only downward. 1. A locking mechanism for a handle-type movable shelf, characterized in that a transmission mechanism is connected to the spring for storing the momentum of the rotational movement of the operating knob or lever and converting it into the linear movement of the locking rod.