JP2003000351A - Locking device for table with collapsible top board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking device to lock a posture of the top board which cannot be viewed from outside so as not to harm the appearance and can be easily structured. SOLUTION: The top board 3 is equipped rotatble around a support shaft 4. An engaging pin 13 equipped to the top board 3 is projected into the support shaft 4. An operating rod 18 is rotatably equipped in the support shaft 4. An operating member 23 is equipped on the tip end part of the operating rod 18. A locking pin 21 is equipped on the operating rod 18. The locking pin 21 is moved shifted off the rotation track of the engaging pin 13 by pushing the operating member 23 force of an energizing means 27 and positioned on the rotation track of the engaging pin 13 by returning the operating rod 18 so as to block rotation of the engaging pin 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device for a folding table, and more particularly to a table which can displace the top plate between a horizontal use state and a substantially vertical folding state when the supporting leg is upright. The present invention relates to a lock device that locks the posture of a plate.

[0002]

2. Description of the Related Art As shown in FIGS.
Is fixed in a standing state, and the top plate 3 is attached to the upper portions of the supporting legs 1 and 2.
Is rotatably provided by a horizontal spindle 4 and the top plate 3 is shown in FIG.
There is known a so-called folding table which is displaced between a substantially vertical folded state and a horizontally used state shown in FIG.

In such a folding table, as shown in FIG.
Conventionally, as a method of holding the top plate 3 in a substantially vertical state so as not to fall down, conventionally, an operation lever is provided on the back side of the top plate 3, and a lock mechanism is provided on the support shaft 4 part. There is one in which the lock mechanisms are connected by an interlocking mechanism and the lock mechanism is operated by an operation lever.

[0004]

In the conventional locking device described above, the interlocking mechanism between the operation lever provided on the top plate 3 which is tilted up and down and the lock mechanism provided on the support shaft 4 is complicated. Since the large operation lever and the interlocking mechanism are installed on the outer peripheral portion of the support shaft 4, there is a problem that they impair the appearance of the table.

Therefore, an object of the present invention is to provide a locking device for a folding table which solves the above problems.

[0006]

In order to solve the above-mentioned problems, the first invention of claim 1 is to fix a support shaft horizontally to the upper end of a support leg, and to attach a top plate to the support shaft. In a rotatably provided substantially vertical posture and a horizontal posture as a center, the support shaft is formed of a hollow tube, and a locking pin protruding into the support shaft is provided on the top plate side, and the locking pin is provided. Together with the top plate so as to rotate in the circumferential direction of the support shaft, and an operating rod is slidably provided in the support shaft in the axial direction of the support shaft. A protruding operating member is provided, and a biasing means for biasing the operating rod in a direction in which the operating portion projects from the support shaft is provided in the support shaft. A lock pin that locks to the locking pin that has rushed in, and when the operating member is pushed and moved toward the support shaft, the lock pin is the locking pin. When deviating from the rotation locus and returning the operating member to the side opposite to the pushing movement direction by the biasing means, the lock pin is positioned on the rotation locus of the locking pin and It is characterized in that rotation is prevented.

According to a second aspect of the present invention, in the first aspect of the present invention, a pair of the lock pins are provided, and the pair of lock pins are arranged in a rotation direction of the locking pin in a substantially vertical posture of a top plate. The top plate is locked on both sides to lock the top plate in a substantially vertical posture.

According to a third aspect of the present invention, in the second aspect of the present invention, one of the pair of lock pins is turned upward in the state in which the top plate is in a horizontal posture. It is provided to lock the movement.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention shown in FIGS. 1 to 6 will be described.

The upper ends of the front support leg 1 and the rear support leg 2 are fixed to a single horizontal support shaft 4 formed of a hollow pipe made of a metal pipe, and these support legs 1 and 2 are non-foldable. It is provided. In addition, casters 5 are provided at the lower ends of the two supporting legs 1 and 2.

On the rear surface of the top plate 3, synthetic resin receiving plates 6 and 6a are located on the left and right of the top plate 3 (left and right in the rear view of FIG. 3) by means of screws or the like in the front-back direction (left side of FIG. 2). Is the front side)
Is stuck to. One of the receiving plates 6 is provided with
As shown in FIGS. 4 to 6, a fitting hole 7 that fits into the support shaft 4 is formed so as to penetrate in the left-right direction. The fitting hole 7 is formed by sandwiching pieces 8 and 9 formed on the outer periphery thereof, and space portions 10 and 11 are formed on the outer periphery of both sandwiching pieces 8 and 9 so that both sandwiching pieces 8 and 9 are inside and outside. It has elasticity in the direction. Further, the top plate 3 side of the fitting hole 7 is opened, and the facing distance D ₁ (see FIG. 5) between the tip portions 8a and 9a of the both holding pieces 8 and 9 in the opening 12 is set to the spindle 4
The diameter is smaller than the outer diameter of.

At the time of assembly, first, in FIG. 6, the support plate 6 is positioned below the support shaft 4, and the support shaft 4 is positioned in the opening 12 of the support plate 6, so that the support plate 6 is supported. Push to the 4 side. As a result, the support shaft 4 presses and deforms both the sandwiching pieces 8 and 9 of the receiving plate 6 to the outside and fits into the fitting hole 7. At this time, by setting the inner diameter of the fitting hole 7 to be substantially the same as the outer diameter of the support shaft 4, the receiving plate 6 can be rotatably supported with respect to the support shaft 4.

A locking pin 13 is fixedly mounted on the receiving plate 6 so as to project into the fitting hole 7. When the receiving plate 6 is assembled as described above, the pin 13 serves as a guide described later. It is designed to project into the support shaft 4 through the elongated hole 14.

After the support plate 6 is fitted to the support shaft 4 as described above, the support plate 6 is fixed to the lower surface of the top plate 3 through the mounting holes 15 with screws or the like. Due to this fixing, the top plate 3 is brought into a substantially vertical folded state shown in FIG.
It can be rotated (raised) to the horizontal use state shown in FIG.

Further, the guide slot 14 is provided in the top plate 3 described above.
The locking pin 13 is formed to be long in the circumferential direction over the range in which the locking pin 13 can be rotated by tilting.

Further, on the lower surface of the receiving plate 6, when the top plate 3 is in a horizontal state as shown in FIG.
A hanging hole 17 that fits into the horizontal rod 16 fixed to the horizontal rod 16 is formed, and the bottom surface of the hanging hole 17 contacts the horizontal rod 16 so that the top plate 3 does not rotate downward from its horizontal state. It has become.

Next, the lock mechanism provided in the support shaft 4 will be described.

In FIGS. 4 to 6, reference numeral 18 denotes an operating rod,
Small-diameter shaft portion 18a and large-diameter intermediate collar 1 provided in the middle thereof
8b and 8b are integrally molded by a synthetic resin.
A guide hole 18c penetrating in the up-down direction is formed in the shaft portion 18a that is ahead of the intermediate brim 18b so as to be long in the axial direction. A rear collar 20 is fitted and fixed to the rear end of the shaft portion 18a. The outer diameters of the flanges 18a, 20 are set to be substantially the same as the inner diameter of the support shaft 4, and the flanges 18a, 20 are supported by the support shaft 4a.
It can be slidably fitted inside.

A first lock pin 21 and a second lock pin 22 are provided on the front side surface 20a of the rear collar 20 at a predetermined interval in the circumferential direction and project at a predetermined position. That is, when the top plate 3 is placed in a substantially vertical posture, the locking pin 13 has both lock pins 21, 2 as shown by the solid line in FIG.
The lock pin 13 is located between the two lock pins 13
When the top plate 3 is in a horizontal posture, the locking pin 13 is located below the second lock pin 22 as shown by a chain line 13a in FIG. At the same time, both lock pins 21 and 22 are set so that the lock pin 13 can be locked to the lower surface of the second lock pin 22.

At the tip of the operating rod 18, an operating member 23 consisting of an operating button is fixed by a screw 24 coaxially with the operating rod 18.

In order to assemble the operating rod 18, first, the spring fixing pin 25 is inserted and fixed in the rear of the support shaft 4 through the hole 26, and then the biasing means 27 formed of a coil spring is opened in the support shaft 4. The operation rod 18 having the rear flange 18b and the operating member 23 fixed thereto is inserted into the support shaft 4 from the opening end side of the support shaft 4 after being inserted into the support shaft 4 from the end side. A cover 28 made of synthetic resin is attached to the opening end side of the support shaft 4. Then, the guide pin 3 is passed through the hole 29 in the support shaft 4.
0 and insert the guide pin 30 into the guide hole 18 of the operating rod 18.
Insert into c. In this state, as shown in FIG. 4, the urging means 27 causes the spring stop pin 25 and the rear collar 20 to move.
The operating rod 18 is biased slightly forward (to the left in FIG. 4) by being interposed in a slightly compressed state, and the rear end surface 18d of the guide hole 18c abuts the guide pin 30 and the front of the rear collar 20. The side surface 20a contacts the rear end of the locking pin 13. The tip of the operating member 23 is the tip of the support shaft 4, more specifically the cover 2
It projects from the tip of 8 for a predetermined length.

The receiving plate 6 is fitted to the support shaft 4 as described above after the operating rod 18 and the like are assembled in the support shaft 4 as described above.

The other receiving plate 6a is only rotatably fitted to the support shaft 4, and the lock mechanism is not provided.

Reference numeral 31 in the drawing denotes a shelf, and the shelf 3
1 is erected and fixed between the two receiving plates 6 and 6a.

An operation of raising and lowering the top plate 3 in the assembled state will be described.

As shown in FIGS. 1, 4 and 5, the top plate 3
Is folded almost vertically, the locking pin 13
As shown in FIGS. 4 and 5, both lock pins 21, 22
A forward direction A which is interposed between and is centered on the spindle 4 of the top plate 3.
The rotation of the locking pin 13 is blocked by contacting the first lock pin 21 with the locking pin 13 positioned on the rotation path of the first lock pin 21, and the rotation of the locking pin 13 in the backward direction B causes the locking pin 13 to move to the first position. The second lock pin 21 is positioned on the rotation locus and abuts against the second lock pin 21 to be blocked, so that the folded state of the top plate 3 is locked.

From this state, when the top plate 3 is brought into a horizontal use state, first, the operating member 23 is pushed manually against the urging force of the urging member 27 and the operating rod 18 is moved to the position shown in FIG.
Move to the right at. As a result, both the lock pins 21 and 22 also move in the same direction, deviate to the right of the locking pin 13, that is, from the turning locus of the lock pins 21 and 22, and the locked state is released.

Next, when the top plate 3 is rotated in the rearward direction B in FIG. 5 while the operation member 23 is kept pressed as described above, the locking pin 13 is also rotated in the same direction, and the top plate 3 is rotated. When is substantially horizontal, the hanging hole 17 is locked on the horizontal rod 16 and the locking pin 13 is positioned below the second lock pin 22 as shown by a chain line 13a in FIG. When the operator releases the operating member 23 in this state, the operating rod 18 is pushed to the left in FIG. 4 by the urging force (returning force) of the urging means 27,
The second lock pin 22 moves on the upward trajectory of the locking pin 13, that is, to a position that blocks the second lock pin 22. Therefore, the top plate 3 is prevented from rotating upward, and the horizontal state of the top plate 3 is locked.

Next, from the horizontal state of the top plate 3, the top plate 3 is
In the case of a substantially vertical folded state, the operating member 23 is pushed in as described above, and the operating rod 18 is pushed and moved rightward in FIG. As a result, both the lock pins 21 and 22 move to the right, and the lock is released as described above.

In this unlocked state, the top plate 3 is rotated in a substantially vertical state as shown in FIGS. 1, 4 and 5, and the locking pin 13 is positioned between the lock pins 21 and 22. Then, release the hand from the operation member 23. As a result, the operating rod 18 is moved forward (leftward in FIG. 4) by the biasing means 27, and both lock pins 21 and 22 are also moved forward, so that the locking pin 13 is placed between the lock pins 21 and 22. Intervenes,
As described above, the top plate 3 is locked so as not to rotate.

[0031]

As described above, according to the present invention, since the lock mechanism for preventing the rotation of the locking pin provided on the top plate side is housed in the support shaft, the lock mechanism cannot be seen from the outside and the table is Does not spoil the appearance.

Further, an operating member and a lock pin are provided on one operating rod, and the locking operation and the unlocking operation can be performed by the axial movement of the operating rod, so that the locking mechanism can be formed with a simple structure and assembled. The attaching work is easy and can be formed at low cost.

According to the second aspect of the invention, the top plate can be locked in a substantially vertical posture.

Further, according to the invention of claim 3, a lock pin for locking the top plate in a substantially vertical posture as described above is provided.
Can also be used as a pin to lock the horizontal position of the top plate.

[Brief description of drawings]

FIG. 1 is a side view of a table showing an embodiment of the present invention in which a top plate is in a substantially vertical state.

FIG. 2 is a side view showing the top plate in a horizontal state from the state shown in FIG.

FIG. 3 is a rear view of FIG.

4 is an enlarged vertical cross-sectional view of the lock mechanism portion in the state of FIG. 1, which is a cross-sectional view taken along the line CC of FIG.

5 is a cross-sectional view taken along the line DD of FIG.

FIG. 6 is a perspective view showing components of essential parts in the present invention.

[Explanation of symbols]

1, 2 support legs 3 Top plate 4 spindles 13 Locking pin 18 Operation rod 21,22 Lock pin 27 Biasing means

Claims (3)

[Claims] 1. A support shaft is horizontally fixed to the upper end of the support leg,
A top plate rotatably about the support shaft in a substantially vertical posture and a horizontal posture, wherein the support shaft is formed of a hollow tube, and a locking pin protruding into the support shaft is provided on the top plate side. Is provided so as to rotate the locking pin together with the top plate in the circumferential direction of the support shaft, and an operating rod is provided in the support shaft so as to be slidable in the axial direction of the support shaft, and the tip of the operating rod is provided. The portion is provided with an operating member projecting from one end of the supporting shaft, and the operating shaft is provided with a biasing means for biasing the operating rod in a direction in which the operating portion projects from the supporting shaft. The rod is provided with a lock pin that is locked to a locking pin that protrudes into the support shaft, and when the operating member is pushed and moved toward the support shaft, the lock pin moves on the rotation path of the locking pin. And the operating member is moved back to the side opposite to the pushing movement direction by the biasing means, Locking device of the top folding table, characterized in that so as to prevent rotation of the locking pin located on rotational locus of stop pins. 2. A pair of the lock pins are provided, and the pair of lock pins are locked to both sides in the rotation direction of the locking pin in the substantially vertical posture of the top plate so that the top plate has a substantially vertical posture. The locking device for a folding table according to claim 1, wherein the locking device is locked. 3. One of the pair of lock pins,
The locking device for a folding table according to claim 2, wherein the locking device is provided so as to lock the upward rotation of the locking pin when the top plate is in a horizontal posture.