JP4478044B2 - Floor lock - Google Patents

Description

  The present invention relates to an improvement in a floor lock used for fixing a carriage or the like equipped with a suspension such as a caster at a desired position.

Conventionally, as shown in, for example, Japanese Utility Model Publication No. 53-52767, a floor lock has a cylindrical stand, a push-up body that can be moved up and down on the same axis with respect to the stand, and an interposition between the stand and the push-up body. And a compression spring that urges the push-up body upward, a shaft that is provided in a horizontal axis with respect to the stand and that has a shaft end protruding outside, a foot member at one end, and the shaft at the other end A lock pedal having a parallel-shaped first pin and having a U-shaped arm formed between the stepping member and the first pin and swingably connected about the axis; and A second pin provided in parallel to the first pin through a bearing piece on a bottom portion of a table provided at an upper end; and the lock pedal formed in parallel with the lock pedal so as to be fitted to the first pin and the second pin. L-shaped unlocking pedal arranged in parallel The push-up body and the stand extend through the link piece according to the stepping operation of the lock pedal. From this state, the first pin passes on a straight line connecting the second pin and the shaft, and the lock pedal is moved to the push-up body side. The first pin is in contact with the lock and the lock is released. When the lock is released, the release member of the lock release pedal is up. When the lock is released, the lock pedal is up. Easy to do.
At this time, the lock release pedal is pivotally attached by two places, the first pin and the second pin. During operation, the lock is released in the forward and reverse directions with the second pin as a fulcrum. As a result, the lock release pedal is also displaced simultaneously.
Here, since the lock pedal and the lock release pedal are arranged in parallel, the lock pedal and the lock release pedal cross each other with their rotation directions being reversed at the time of operation.
In particular, when the lock is released, the pedals may suddenly cross each other due to the repulsive force of the compressed spring.
In the above device, the lock release pedal is formed with an arc-shaped long hole so as to allow the release pedal to turn in the stepping direction, and the lock release pedal is held at substantially the same position. Since the position of the pedal is almost constant and the lock pedal and the lock release pedal partially overlap when the lock is released, the same problem remains.

Refer to Fig. 1 of No. 53-52767

  The present invention was devised in view of the above circumstances, and the main problem thereof is a floor lock in which the lock release pedal is not directly interlocked with the link piece so that the object is not pinched strongly when the lock is released. Is to provide.

In order to solve the above problems, the present invention provides a floor lock according to claim 1,
An extendable stand that has a plate-like support at the upper end and is biased upward;
A lock pedal pivotally attached to the stand portion by a first pin, extending forward and backward beyond the stand portion, and having a lock pin capable of abutting with the stand portion on the rear end side and a step portion attached to the front end side When,
A lock release pedal that is arranged on the outside along with the lock pedal, and whose rear end is pivotally attached to the back surface of the support portion by a second pin;
A link piece spanned between the second pin and the lock pin and pivotally attached;
It is characterized by comprising urging means that is stretched between the lock pin and the lock release pedal and between the upper position of the lock pin and urges the lock release pedal in a direction approaching the lock pin.
In the invention of claim 2,
One end of the biasing means is hooked on the operating portion, and the other end is hooked on a lock pin.
In the invention of claim 3,
The stand part includes a base part, a support leg part standing on the base part, an inner cylinder part supported on the support leg part, and an outer cylinder that is externally fitted to the inner cylinder part and slidable up and down. A plate-like support part is fixed on the outer cylinder part.
The lock pedal is attached to a lever body that extends in a pair on the left and right sides with a stand part, a lock pin that is attached to be attached between the rear ends of the pair of lever bodies, and a front portion of the pair of lever bodies. It consists of a step part 42,
A middle position of the lever main body is pivotally attached to a first pin penetrating the inner cylinder portion.
Furthermore, in the invention of claim 4,
The link piece is formed in a substantially U-shaped cross section consisting of a pair of left and right side plates and a lower continuous piece extending in series below the side plates, and the upper portions of the left and right side plates are connected to the second pin. It is pivotally attached, and the lower part is pivotally attached to the lock pin.
The pivot point of the second pin is disposed inside the pivot point of the unlocking pedal with respect to the second pin.

In the present invention, the lock release pedal is merely pivotally attached to the second pin, and the lock pin is connected to the lock pin via an urging means such as a coil spring. Therefore, when the lock release pedal is operated, the lock release pedal is connected. Even if a finger or an object enters under the release pedal, the lock release pedal does not intersect with the jumping up lock pedal, and instead it is displaced upward against the biasing force. There is no risk of pinching, and safety is high.
Moreover, since it is not necessary to use a long hole, there is no backlash of a product and it is excellent in stability.

In this invention, the lock release lever is pivotally attached to the stand portion by the second pin, and the lock pin is connected to the lock pin via an urging means such as a coil spring, thereby improving the safety of the product.
Hereinafter, preferred embodiments of the floor lock of the present invention will be described with reference to the drawings.

A floor lock 1 shown in FIGS. 1 and 2 includes a plate-like support portion 2 at an upper end and an extendable stand portion 3 biased upward, and a lock pedal 4 pivotally attached to the stand portion 3. The lock release pedal 5 is arranged side by side on the outside of the lock pedal 4 and the rear end of the lock pedal 4 is pivotally attached to the back surface of the support portion 2, and spans between the front end of the lock pedal 4 and the back surface of the support portion 2. The link piece 6 is pivotally attached.
In this embodiment, the left side in the figure is the front and the right side is the rear.

[Stand]
The stand part 3 includes a base part 31, a support leg part 32 standing on the base part 31, an inner cylinder part 33 supported by the support leg part 32, and an outer cylinder that is fitted on the inner cylinder part 33 and is slidable up and down. The plate-like support portion 2 is fixed on the outer cylinder portion 34.
The base part 31 has a ball seat 35 on its upper surface, and a compression spring 37 is built in between the base part 31 and a spring receiver 36 provided above, and has a known structure that supports the support leg part 32 in a pivotable manner. .

And between the inner cylinder part 33 and the outer cylinder part 34, 1st biasing means (not shown), such as a coil spring, is incorporated, and the outer cylinder part 34 is urged | biased so that it can protrude upwards, When the inner cylinder part 33 is pushed down, the first urging means is compressed to increase the urging force, the outer cylinder part 34 is fitted onto the inner cylinder part 33, and the stand part 3 becomes longer as shown in FIG.
Further, the outer cylinder part 34 is formed with a semicircular cutout part 34a at the lower edge, and is fitted to a pin P1 projecting from the inner cylinder part 33 when ascending, so that the inner cylinder part 33 has a predetermined stroke. Can be raised.

[Rock pedal]
Next, a lock pedal 4 is attached to a middle position of the stand portion 3 so that an intermediate portion is pivotally attached by a first pin P1 and extends back and forth beyond the stand portion 3.
In the case of the present embodiment, the lock pedal 4 includes a lever body 41 that extends in a pair on the left and right sides with the stand portion 3 interposed therebetween, a lock pin P3 that is attached between the rear ends of the pair of lever bodies 41, and a pair of levers. It consists of a step portion 42 that is stretched over and attached to the front of the main body 41.

As will be described later, the lock pin P3 collides with the outer peripheral wall of the outer cylindrical portion 34 of the stand portion 3 when the step portion 42 of the lock pedal 4 is depressed to extend the stand portion 3, and the lock pedal 4 The reverse rotation is locked, and the extended posture of the stand unit 3 is maintained.
On the other hand, a first pin P <b> 1 extending horizontally is fixed to the stand part 3 so as to penetrate the lower part of the inner cylinder part 33, and both ends thereof protrude outward from the inner cylinder part 33.
An intermediate portion of the pair of lever bodies 41 of the lock pedal 4 is pivotally attached to the protruding portion of the first pin P1.

[Lock release pedal]
The lock release pedal 5 is arranged side by side on the outside of the lock pedal 4.
In the case of the illustrated example, the lock release pedal 5 includes one lever-like release pedal body 51 disposed on one side of the stand portion 3 and a step piece portion 52 that bends forward of the release pedal body 51 and extends forward. It is made up of.

However, in the present invention, a U-shaped member including a pair of left and right lever pieces and a step portion spanned between the pair of lever pieces so as to cover the outside of the lock pedal 4 may be used.
The lock release pedal 5 is pivotally attached to a bracket 21 whose rear end protrudes from the back surface of the support portion 2 by a second pin P2.

[Link fragment]
Next, both ends of the link piece 6 are pivotally attached to the lock pin P3 and the second pin P2.
The link piece 6 has a substantially U-shaped cross section formed of a pair of left and right side plates 61 and a lower continuous piece 62 that is stretched in series below the side plates 61. Is pivotally attached to the second pin P2, and the lower part is pivotally attached to the lock pin P3.

Here, the second pin P2 extends horizontally between a pair of left and right brackets 21 depending on the back surface of the support portion 2 and protrudes outward.
Then, outside the bracket 21, first, a pair of left and right upper portions of the link piece 6 is pivotally attached to the second pin P2, and the distal end side of the lock release pedal 5 is pivotally attached coaxially, and the link to the second pin P2 The pivot point of the piece 6 is arranged inside the pivot point of the lock release pedal 5.

[coil spring]
The lock release pedal 5 is provided with a hook-like hooking portion 53 that protrudes inwardly beyond one side plate 61 of the link member 6 above the pivoting position with the second pin P2.
An upper end of a coil spring 54, which is an example of a second urging means, is hooked on the hook portion 53, and a lower end of the coil spring 54 is hooked on the lock pin P3.
The lock release pedal 5 is provided with a pin-like actuating portion 13 projecting inwardly below the latching portion 53 and arranged so as to contact the link piece 6.
In this embodiment, the operating part 13 is provided separately, but the position of the latching part 53 may be lowered so as to be combined with the operating part.

The actuating portion 13 is biased in the direction approaching the lock pin P3 by the biasing force of the coil spring 54.
Thereby, the said operation part 13 is in contact with the edge part of the one side plate 61 of the link member 6, when a load is not applied from the outside.

[Pin position]
Here, the first pin P <b> 1 is fixed to the inner cylinder portion 33, and the second pin P <b> 2 is fixed below the support portion 2, but its position changes due to the expansion and contraction of the stand portion 3.
The biasing force applied by the first biasing means built in the stand portion 3 is such that the lock pin P3 is displaced with respect to the line L connecting the first pin P1 and the second pin P2, and the above When it is on the line L, it becomes a thought point, and when the line L is crossed, the urging force works in the direction beyond it.

  Accordingly, as described above, when the lock pedal 4 reaches the lock position of FIG. 2 where the lock pin P3 exceeds the thought point and abuts the outer cylinder portion 34, the lock pedal 4 is urged in the lock direction. Therefore, the locked posture can be maintained.

Therefore, when the lock release pedal 5 is depressed, the actuating portion 13 pushes down the side plate 61 of the link piece 6 and rotates the link piece 6 counterclockwise in the figure with the second pin P2 as a fulcrum.
Due to the rotation of the link piece 6, the lock pin P <b> 3 is separated from the abutting position of the outer cylinder portion and pulled down beyond the line L between P <b> 1 and P <b> 2.
At the same time, the lock pedal 4 is rotated clockwise with the first pin P1 as a fulcrum by the operation of the link piece 6 to reach the lock release position where the step portion 42 is displaced higher than the lock release lever 5 ( (See FIG. 1).

Further, when the step portion 42 of the lock pedal 4 is stepped down from this unlocked position, the link piece 6 is interlocked, and when the lock pin P3 exceeds the line L between P1 and P2, the lock piece is locked as shown in FIG. The pedal 4 is urged counterclockwise in the figure.
Then, the lock pin P3 can abut the outer cylinder portion and lock the position of the lock pedal 4.

In the present embodiment, when the lock pedal 4 is in the unlocked position, the step portion 42 is set to have a certain interval S at which the finger or the like enters the support portion 2.
On the other hand, the lock release lever 5 is interlocked with the lock pin P3 via a coil spring 54. However, when a finger or the like enters between the lock pedal 4 and the lock release lever 5 as shown in FIG. The coil spring 54 can be extended to displace the lock release pedal 5 to the uppermost position where it comes into contact with the back surface of the support portion 2, and the interval S 'is substantially the same as the interval S (the interval obtained by subtracting the thickness of the step piece portion 52). Can be opened at any time.

  Thus, when the step piece 52 of the lock release pedal 5 is stepped on and the step part 42 of the lock pedal 4 jumps up in conjunction with this, a finger or the like enters under the step piece 52 of the lock release pedal 5. However, since the lock release pedal 5 is rotated upward (clockwise in the figure) with the second pin P2 as a fulcrum against the urging force of the coil spring 54, the finger or the like is placed during the interval S ′. It is not caught between the lock release pedal 5 and the lock pedal 4.

When the finger or the like is removed, the lock release pedal 5 rotates counterclockwise from the position shown in FIG. 3 about the second pin P2 as a fulcrum by the urging force of the coil spring 54, and the lock pedal shown in FIG. 4 can be displaced to the lock release position with the stepped portion as the upper level.
In the above embodiment, the extension structure of the stand part is the structure of the inner cylinder part fixed on the support leg part and the outer cylinder part that can be extended and contracted with respect to the inner cylinder part. It may be formed integrally.

Moreover, the attachment position of a 1st pin should just be a position where the stand part was fixed, and may be a support leg part.
In addition, it goes without saying that various design changes can be made in accordance with the application without departing from the gist of the present invention.

It is a side view which shows the lock release state of the Example of a floor lock. It is a side view which shows the locked state. It is a side view explaining the state where a lock release lever escapes when a finger etc. enter under a lock release pedal at the time of lock release. It is a rear view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor lock 2 Support part 3 Stand part 4 Lock pedal 5 Lock release pedal 6 Link piece 13 Actuator part 21 Bracket 31 Base part 32 Support leg part 33 Inner cylinder part 34 Outer cylinder part 35 Ball seat 36 Spring support 37 Compression spring
41 Lever main body 42 Step part 51 Release pedal main body 52 Step piece part 53 Hook part 54 Coil spring 61 Side plate 62 Connection piece

Claims (4)

An extendable stand that has a plate-like support at the upper end and is biased upward;
A lock pedal pivotally attached to the stand portion by a first pin, extending forward and backward beyond the stand portion, and having a lock pin capable of abutting with the stand portion on the rear end side and a step portion attached to the front end side When,
A lock release pedal that is arranged on the outside along with the lock pedal, and whose rear end is pivotally attached to the back surface of the support portion by a second pin;
A link piece spanned between the second pin and the lock pin and pivotally attached;
An operating part projecting at a position where the lock release pedal can contact the link piece;
A floor lock comprising: an urging means that is stretched between the lock pin and the lock release pedal and urges the lock release pedal in a direction approaching the lock pin.   The floor lock according to claim 1, wherein one end of the urging means is hooked on the operating portion, and the other end is hooked on the lock pin. The stand part is a base part, a support leg part standing on the base part, an inner cylinder part supported on the support leg part, and an outer cylinder part that is externally fitted to the inner cylinder part and slidable up and down. A plate-like support part is fixed on the outer cylinder part,
A step in which the lock pedal is spanned and attached between the lever body extending in a pair on the left and right sides of the stand portion, a lock pin spanned between the rear ends of the pair of lever bodies, and the front of the pair of lever bodies. Part 42,
2. The floor lock according to claim 1, wherein a middle position of the lever main body is pivotally attached to a first pin that penetrates the inner cylinder portion. The link piece is formed in a substantially U-shaped cross section consisting of a pair of left and right side plates and a lower continuous piece that extends in series between the side plates, and the upper portions of the left and right side plates are pivoted to the second pin. Worn, the lower part is pivotally attached to the lock pin,
The floor lock according to any one of claims 1, 2 and 3, wherein the pivot point of the second pin is disposed inside the pivot point of the unlocking pedal with respect to the second pin.

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