JP4551441B2 - 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 lever having a parallel-shaped first pin and comprising a dog-shaped arm formed between the stepping member and the first pin and swingably connected about the axis; and the push-up body A second pin provided in parallel with the first pin through a bearing piece at the bottom of the table provided at the upper end of the table, and formed in parallel with the lock pedal lever so as to fit the first pin and the second pin, L shape arranged in parallel with the lock pedal lever The push-up body and the stand extend through the link piece according to the depressing operation of the lock pedal lever, and from this state, the first pin passes on a straight line connecting the second pin and the shaft, and The first pin of the lock pedal lever is brought into contact with the push-up body so as to be in a locked state. When the lock is released, the foot member of the lock release pedal lever is up, and when the lock is released, the foot member of the lock pedal lever Is on top, making it easier for the user to operate.
At this time, the lock release pedal lever is pivotally attached to the first pin and the second pin. During operation, the lock release pedal lever rotates in the forward direction and the reverse direction using the second pin as a fulcrum. Accordingly, the lock release pedal lever is also displaced at the same time.
Here, since the lock pedal lever and the lock release pedal lever are arranged in parallel, at the time of operation, the lock pedal lever and the lock release pedal lever cross each other with their rotation directions reversed.
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 lever is formed with an arc-shaped long hole so as to allow the release pedal to turn in the stepping direction, and the position of the lock release pedal lever is held at substantially the same position. Since the position of the lock release pedal lever is almost constant and the lock pedal lever and the lock release pedal lever partially overlap when releasing the lock, the same problem remains.
In view of this, the present inventor has disclosed a plate-like support in Japanese Patent Laid-Open No. 2006-240504 as a floor lock in which the lock release pedal lever is not directly interlocked with the link piece so that the lock release pedal lever is not strongly pinched when the lock is released. A telescopic stand with an upper end and an upwardly biased portion, and is pivotally attached to the stand by a first pin and extends back and forth beyond the stand, and abuts the stand at the rear end A lock pedal lever to which a possible lock pin is attached and a step portion is attached to the front end side is arranged outside along with the lock pedal lever, and a rear end side is pivotally attached to the back surface of the support portion by a second pin A lock release pedal lever, a link piece spanned and pivoted between the second pin and the lock pin, and the lock release pedal lever contacting the link piece. A floor comprising an actuating portion projecting at a possible position, and an urging means that hangs between the lock pin and the lock release pedal lever and urges the lock release pedal lever in a direction approaching the lock pin. Proposal of locks, with appropriate results.

Refer to Fig. 1 of No. 53-52767 JP 2006-240504 A

  As a result of further research, the inventor has reduced the stroke of the lock release pedal lever and formed the lock pedal lever in a substantially square shape so as to intersect the lock pedal lever when operating the lock release pedal lever. The object of the present invention is to provide a floor lock that prevents a finger or object from being pinched strongly when the lock is released.

In order to solve the above problems, the present invention
In the floor lock of claim 1,
An extendable / retractable stand that urges the movable part having a support part at the upper end upward with respect to the fixed main body part;
The midway part is pivotally attached to the fixed part of the stand part with a first pin, both ends extend forward and backward beyond the stand part, and a lock pin provided at a position above the first pin is provided at the rear end part. A lock pedal lever having a step portion attached to the front end;
A lock release pedal lever having both ends extending forward and backward beyond the stand portion at a position above the lock pedal lever, a rear end portion pivotally attached to the support portion by a second pin, and a step attached to the front end portion;
A pin receiving portion that is formed on the lower surface of the lock release pedal lever, and abuts against the lock pin of the lock pedal lever when unlocked to displace the lock pin in the unlock direction;
A link piece having one end fixed to the second pin and the other end pivoted to the lock pin, and swinging around the second pin;
Biasing means for biasing the lock release pedal lever to an upward standby position;
The lock release pedal lever is provided with a stopper that restricts rotation of the lock release pedal lever in the standby direction by abutting with the back surface of the support portion and a stopper that controls rotation of the lock release pedal lever in the depression direction. The rotation angle of the pedal lever is regulated,
The lock pin is provided so as to be displaced to a lock position in front of a line connecting the first pin and the second pin and a lock release position in the rear.
In the invention of claim 2,
The stand portion includes a movable portion and a main body portion. The main body portion includes a base portion, a support leg portion standing on the base portion, and an inner cylinder portion supported on the support leg portion. ,
The movable part is formed of an outer cylinder part that is externally fitted to the inner cylinder part and is slidable up and down, and a plate-like support part is fixed on the outer cylinder part,
A first spring for urging the stand portion in a shortening direction is spanned between the support portion and a first pin fixed to the inner cylinder portion.
Furthermore, in the invention of claim 3,
The link piece is formed in a substantially U-shaped cross section consisting of a pair of left and right side plates and an upper continuous piece extending in series above the side plates, and the upper portions of the left and right side plates serve as second pins. It is pivotally attached, and the lower part is pivotally attached to the lock pin, and the pivot point of the second pin is disposed inside the pivot point of the lock release pedal lever with respect to the second pin.

In the present invention, the lock pin is displaced from the locked position to the unlocked position by displacing the lock pin from the front to the rear only by slightly tilting the lock release pedal lever. Can do.
In this operation, the lock release pedal lever does not cross the lock pedal lever, so there is no risk of pinching fingers or objects, and the lock release pedal lever does not interlock with the lock pedal lever when unlocked. Is expensive.
In addition, since it is not necessary to use a long hole as in the prior art, there is no backlash of the product and the stability is excellent.

In this invention, when the lock is released, the lock release pedal lever is not interlocked with the lock pedal lever, and when the lock is released, the lock release pedal lever operates the lock pin of the lock pedal lever. The lock lever can be locked or unlocked.
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 its upper end and an extendable stand portion 3 biased upward, and a lock pedal lever 4 pivotally attached to the stand portion 3. A lock release pedal lever 5 that is arranged side by side on the outside of the lock pedal lever 4 and whose rear end is pivotally attached to the back surface of the support portion 2, and the front end of the lock pedal lever 4 and the back surface of the support portion 2 It consists of a link piece 6 that is stretched around and 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 movable part and a non-movable main body part. The main body part includes a base part 31, a support leg part 32 standing on the base part 31, and an inner cylinder part 33 supported by the support leg part 32. It is made up of.
The movable part includes an outer cylinder part 34 that is externally fitted to the inner cylinder part 33 and is slidable up and down, and the plate-like support part 2 is fixed on the outer cylinder part 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 at the lower end of the inner cylinder part 33, and supports the base part 31 so as to be pivotable. It consists of a configuration.

And between the inner cylinder part 33 and the outer cylinder part 34, coil spring S1 as a 1st biasing means is incorporated.
The upper end of the coil spring S1 is hooked on the top wall of the outer cylindrical portion 34 fixed to the support portion 2, and the lower end is hooked on a first pin P1 that penetrates the inner cylindrical portion 33 horizontally. .
Thus, when the inner cylinder part 33 is pushed down, the coil spring S1 is expanded and the repulsive force is increased, the inner cylinder part 33 extends from the outer cylinder part 34, and the stand part 3 extends as shown in FIG.
Further, the outer cylinder part 34 is formed with a semicircular cutout part 34a at the lower edge, and the inner cylinder part 33 is fitted to the first pin P1 projecting from the inner cylinder part 33 when ascending. A predetermined stroke can be increased.

[Lock pedal lever]
Next, a lock pedal lever 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 lever 4 has a substantially rectangular shape, and a bent portion is pivotally attached to the first pin P1 and extends upward, and is disposed in a pair of left and right with the stand portion 3 interposed therebetween. 41, a lock pin P3 that is spanned and attached between the rear ends of the pair of lever main bodies 41, and a step portion 42 that is spanned and attached between the front of the pair of lever main bodies 41.

The lock pin P3 is set so as to be always at a position above the first pin P1 on the rear end side of the lock pedal lever 4.
As 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 lever 4 is depressed to extend the stand portion 3, and the lock pin P3 is locked. The reverse rotation of the pedal lever 4 is locked, and the extended posture of the stand unit 3 is maintained.
Both ends of the first pin P <b> 1 protrude outward from the inner cylinder portion 33 to the stand portion 3, and are pivotally mounted at positions below the central bent portions of the pair of lever bodies 41 of the lock pedal lever 4. Yes.

[Lock release pedal lever]
Next, the lock release pedal lever 5 is arranged side by side on the outside of the lever body 41 on one side of the lock pedal lever 4.
In the case of the illustrated example, the lock release pedal lever 5 includes a single lever-like release pedal body 51 disposed on one side of the stand portion 3 and a step of the lock pedal lever 4 by bending the front of the release pedal body 51. The portion 42 is composed of a step piece portion 52 that extends outward at a spaced position.
Reference numeral 55 is a stopper that restricts the clockwise release of the lock release pedal lever 5 in contact with the back surface of the support portion 2, and 56 is a stopper that restricts the counterclockwise rotation in the figure.
The lock release pedal lever 5 is pivotally attached by a second pin P2 to a bracket 21 whose rear end protrudes from the back surface of the support portion 2.

[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 is formed by connecting a pair of left and right side plates 61 by means of an upper continuous piece (not shown) to form a substantially U-shaped cross section, and the upper portions of the left and right side plates 61 are pivotally attached to the second pin P2. 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.
The pair of left and right upper portions of the link piece 6 is first pivotally attached to the second pin P2 outside the bracket 21, and the distal end side of the lock release pedal lever 5 is coaxially attached to the outside thereof. The pivot point of the link piece 6 with respect to the pin P2 is disposed inside the pivot point of the lock release pedal lever 5.

[Spring]
The lock release pedal lever 5 is provided with a biasing means for biasing to the lock standby position.
In this embodiment, a spiral spring S2 wound around the second pin P2 and having one end hooked on the back surface of the support 2 and the other end hooked on the lock release pedal lever 5 is attached. The pedal lever 5 is urged to a standby position in a substantially horizontal posture.

[Pin position]
Here, the first pin P1 is fixed to the inner cylinder portion 33, and the second pin P2 is fixed below the support portion 2. However, the positions of the first pin P1 and the lock pin P3 by the expansion and contraction of the stand portion 3 are as follows. Change.
The biasing force applied by the coil spring S1 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 line L When it comes to the point, it becomes a thought point, and by exceeding this line L, the biasing force works in the direction beyond it.

Therefore, as described above, when the lock pedal lever 4 reaches the lock position shown in FIG. 2 in which the lock pin P3 is displaced to the forward position beyond the thought point, the lock pedal lever 4 is urged in the lock direction. Therefore, the locked posture can be maintained.
Here, the lock pin P3 is not displaced further forward because the outer cylinder portion 34 serves as a stopper.

Here, the lower surface of the lock release pedal lever 5 is provided with a notch formed in a step shape for receiving a pin that abuts with the lock pin P3 of the lock pedal lever 4 at the time of locking. Yes.
Therefore, when the lock release pedal lever 5 is depressed to the dotted line position in the drawing in the lock posture shown in FIG. 2, the operating portion 13 formed at the lower end of the lock release pedal lever 5 pushes the lock pin P3.
As a result, the link piece 6 rotates counterclockwise in the figure with the second pin P2 as a fulcrum.
By the rotation of the link piece 6, the lock pin P3 moves backward beyond the line L between P1 and P2 (see FIG. 3).
At the same time, the lock pedal lever 4 is rotated clockwise with the first pin P1 as a fulcrum by the operation of the link piece 6 so that the step portion 42 is substantially aligned with the lock release lever 5 or displaced to a high position. The release position is reached (see FIG. 1).

Further, when the step part 42 of the lock pedal lever 4 is stepped down from the lock release position, the link piece 6 is interlocked, and when the lock pin P3 exceeds the line L between P1 and P2, as shown in FIG. The lock pedal lever 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 lever 4.

In this embodiment, the lock release pedal lever 5 has its step portion 52 close to the support portion 2, but the tilt angle for unlocking may be small.
Thereby, when the lock release pedal lever 5 pivots and the lock pedal lever 4 is unlocked, the lock release pedal lever 5 and the lock pedal lever 4 do not cross each other.
Further, when the lock release pedal lever 5 is unlocked, the lock release pedal lever 5 is only urged by the spring S2 at the position of the second pin P2 which is the pivot of the rear end, and the movement is restricted by the lock pedal lever 4. Absent.

Further, in this embodiment, the lock pedal lever 4 is formed in a hollow shape whose center is recessed downward, and is always wide open with the support portion 2, so there is no fear of pinching a finger or the like.
Similarly, as illustrated in FIG. 2, since the tilt angle of the lock release pedal lever 5 is small, it is difficult to pinch a finger or an object with the lock pedal lever 4.
Even when pinched, the lock pedal lever 4 can pivot the link 6 around the second pin P2 to pivot the lever main body 41 away from the lock release pedal lever 5.

As a result, when the step piece 52 of the lock release pedal lever 5 is stepped on and the step portion 42 of the lock pedal lever 4 jumps up in conjunction with this, the finger is placed below the step piece 52 of the lock release pedal lever 5. And the like, the lock release pedal lever 5 and the lock pedal lever 4 are not pinched.
The present invention is not limited to the above-described embodiments, and it is needless to say that various design changes can be made according to the application without changing the gist of the present invention.

It is a fragmentary sectional view of 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 at the time of unlocking by operating a lock release pedal lever from a locked state. It is a side view of a lock release state. It is the same top view. It is the same front view. It is a front view which shows connection with a lock release pedal lever, a link, and a lock pedal lever.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Floor lock 2 Support part 3 Stand part 4 Lock pedal lever 5 Lock release pedal lever 6 Link piece 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 61 Side plate 62 Consecutive piece S1 First spring S2 Spring

Claims (3)

An extendable / retractable stand that urges the movable part having a support part at the upper end upward with respect to the fixed main body part;
The midway part is pivotally attached to the fixed part of the stand part with a first pin, both ends extend forward and backward beyond the stand part, and a lock pin provided at a position above the first pin is provided at the rear end part. A lock pedal lever having a step portion attached to the front end;
A lock release pedal lever having both ends extending forward and backward beyond the stand portion at a position above the lock pedal lever, a rear end portion pivotally attached to the support portion by a second pin, and a step attached to the front end portion;
A pin receiving portion that is formed on the lower surface of the lock release pedal lever, and abuts against the lock pin of the lock pedal lever when unlocked to displace the lock pin in the unlock direction;
A link piece having one end fixed to the second pin and the other end pivoted to the lock pin, and swinging around the second pin;
Biasing means for biasing the lock release pedal lever to an upward standby position;
The lock release pedal lever is provided with a stopper that abuts against the back surface of the support portion to restrict rotation of the lock release pedal lever in the standby direction and a stopper that restricts rotation of the lock release pedal lever in the depression direction to release the lock. The rotation angle of the pedal lever is regulated,
The floor lock, wherein the lock pin is provided so as to be displaced to a lock position in front of a line connecting the first pin and the second pin and a lock release position in the rear. The stand part is composed of a movable part and a main body part,
The main body portion includes a base portion, a support leg portion standing on the base portion, and an inner cylinder portion supported on the support leg portion,
The movable part is formed of an outer cylinder part that is externally fitted to the inner cylinder part and is slidable up and down, and a plate-like support part is fixed on the outer cylinder part,
The floor lock according to claim 1, wherein a first spring that urges the stand portion in a shortening direction is stretched between the support portion and a first pin fixed to 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 an upper continuous piece that is stretched in series above the side plates,
The upper part of the left and right side plates is pivotally attached to the second pin, and the lower part is pivotally attached to the lock pin, and the pivot point of the second pin is located inside the pivot point of the lock release pedal lever for the second pin. The floor lock according to claim 1, wherein the floor lock is disposed.

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