JPH09294633A - Lock device of top board in foldable type table - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve a locking function for keeping a top board horizontal or upright in a foldable type table in which the top board is rotated by springing it up. SOLUTION: A lock member 8 sticking out in the direction of the rear of a table is fastened on a horizontal beam 4 linked between upper ends of right and left leg bodies and a top board 5 is pivoted on the lock member 8 by a support shaft 9. First and second engaging grooves 10 and 11 radially extending from the center of the support shaft 9 is cut open and formed on the lock member 8. A lock pin 12 attached on a reinforced member 6 of the top board 5 is selectively engaged with both the engaging grooves 10 and 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folding table in which a top plate can be flipped up and rotated from a horizontal state to a standing state in a side view, and the top plate is selectively placed in the horizontal state and the standing state. The present invention relates to a lock device for holding.

[0002]

2. Description of the Related Art A locking device for a folding table having a top plate which can be tilted up and down is, for example, as disclosed in Japanese Utility Model Laid-Open No. 57-12942.
No. 8 gazette, Jpn.
No. 826, Japanese Utility Model Publication No. 5-37775, and the like. Of these, in Japanese Utility Model Publication No. 57-129428, Japanese Utility Model Publication No. 1-16419, and Japanese Utility Model Publication No. 7-1826, a horizontal lock is provided in the vicinity of the center of rotation of the top plate of the legs. While the pins are provided, a lever provided with a pair of engagement grooves into which the lock pins are selectively fitted in a horizontal state and an upright state is rotatably provided on the lower surface of the top plate,
This lever is configured to be biased by a spring in a direction to engage with the lock pin, and the lever is rotated against the spring to release the engagement between the lock pin and the engagement groove. The top plate is rotated.

On the other hand, in the lock device disclosed in Japanese Utility Model Publication No. 5-37775, one lock pin is provided on the lower surface of the top plate, while the leg is provided with the lock pin when the top plate is tilted. A lever provided with an engaging groove that selectively fits is rotatably pivotally attached, and this lever is biased by a spring so that the locking pin is held in the engaging groove.
When the lever is rotated against the spring to release the engagement between the lock pin and the engagement groove, the top plate can be rotated.

[0004]

By the way, in the folding table of this kind, the center of rotation of the top plate is located closer to the back surface (the part on the opposite side to the user) of the top plate so that the top plate can be moved. In a horizontal posture, the top plate is supported by legs, etc., the lock device holds the horizontal state, and the top plate is flipped up and rotated with its back face facing downward. ing.

In each of the above-mentioned prior arts, the engaging groove of the lever is formed into a hook shape, and by fitting this into the lock pin, the horizontal state and the standing state are maintained.
In Japanese Utility Model Publication No. 1-16419, Japanese Utility Model Publication No. 7-1826, and Japanese Utility Model Publication No. 5-37775, when the top plate is tilted horizontally, the engaging groove causes the top plate to rotate upright. Since it opens in a direction that allows it to escape from the lock pin, if a large downward force is applied to the edge near the back of the horizontally tilted top plate, the lock pin will disengage from the engagement groove and There is a problem that the plate may rotate in the standing direction.

On the other hand, in Japanese Utility Model Publication No. 5-37775, the above problem does not occur, but since the engagement between the lever and the lock pin is shallow in the standing state, there is a problem in the reliability of holding the top plate in the standing state. was there. It is an object of the present invention to provide a lock device that can reliably hold a top plate in a horizontal state and a standing state.

[0007]

In order to achieve this object, the present invention provides that "the left and right legs are integrally connected by a lateral beam, and the top plate is flipped up and rotated with respect to the lateral beam or the legs. In a foldable table that is freely pivoted, a lock member is provided on the transverse beam or leg so that the outer peripheral surface thereof extends around the rotation center of the top plate, and the lock member is attached to the outer peripheral portion of the lock member. At least a pair of engaging grooves extending in the radial direction from the center of rotation of the plate are provided at a rotation angle of the top plate, while the top plate is tilted up and down near the lock member on the lower surface of the top plate. A lock pin that selectively fits in a pair of engagement grooves in the lock member in relation to the movement is movably provided so as to be disengaged from the engagement groove by a lever operation, and the lock pin is engaged in the engagement. Provided with spring means for urging to fit in the groove It was in the configuration.

[0008]

As described above, when the engagement groove of the lock member is formed so as to extend in the radial direction from the center of rotation of the top plate, the direction in which the lock pin is disengaged from the engagement groove and the rotation of the lock pin. Since the directions are substantially orthogonal to each other, the top plate cannot be rotated unless the lock pin is operated to disengage the lock pin from the engagement groove against the spring means. In other words,
Even if a large load is applied to any part of the tabletop in the horizontal state, the tabletop does not rotate in the standing direction, and the tabletop in the standing state does not unexpectedly fall and rotate due to an external force,
The lock function of the top plate can be greatly improved.

[0009]

Next, embodiments of the present invention will be described with reference to the drawings. 1 (A) is a partial perspective view of the table 1, FIG. 1 (B) is a horizontal sectional view taken along the line BB of FIG. 1 (A), FIG. A sectional view taken along line III-III and FIGS. 4 and 5 are views showing the operation.

The table 1 includes a pair of left and right legs 2 provided with casters 3 at the front and rear, a hollow cross beam 4 connected between the upper portions of the left and right legs 2, and a top plate 5 supported by the legs 2. Is equipped with. Reinforcing members 6 extending in the front-rear direction are fixed to the lower surfaces of the top plate 5 near the left and right ends. As shown in FIG. 2, the reinforcing member 6 is formed in a gutter shape having an upward opening in cross section, and a wing-shaped flange is provided on the upper surface.

As shown in FIGS. 2 and 3, the reinforcing member 6 is used.
A bracket 7 extending along the back surface of the horizontal beam 4 is fixed to the side surface of the horizontal beam 4 by welding or the like, while a lock member 8 having a shape that fits the horizontal beam 4 from above is fixed to the horizontal beam 4 by welding. The member 8 and the bracket 7 are pivotally attached to each other by a pivot 9 extending parallel to the cross beam 4. Therefore, the top plate 5 can be rotated about the pivot 9 from a horizontal state to a standing state. When the top plate 5 is horizontal, the reinforcing member 6 is supported on the upper surface of the cross beam 4.

A U-shaped first engaging groove 10 which is opened upward and a U-shaped second engaging hole which is horizontally opened are provided in a portion of the lock member 8 projecting toward the back surface of the table 1. The groove 11 and the groove 11 are cut open. Both of these engaging grooves 1
Numerals 0 and 11 are set so as to open in the radial direction from the axis of the pivot 9, and the distances from the axis of the pivot 9 to the centers of both engagement grooves 10 and 11 are set to be the same. are doing.

Further, in the lock member 8, both engaging grooves 10,
11 is an arc-shaped guide surface 8 centered on the pivot 9.
It is formed in a. The bracket 7 and the side plate of the reinforcing member 6 to which the bracket 7 is attached have a vertically elongated slot 13 into which a lock pin 12 is vertically movably fitted. When the top plate 5 is laid horizontally, the lower part of the slot 13 and the first engaging groove 10 are
Are overlapped with each other, and the lower portion of the elongated hole 13 and the second engaging groove 11 are set to overlap with each other when the top plate 5 is erected.
Therefore, the lock pin 12 is inserted into the engagement groove 1 through the slot 13.
0 and 11 can be selectively fitted and engaged.

The lock pin 12 is fixed to the tip of a lever 14 built in the reinforcing member 6 by welding or the like. Further, the lever 14 is formed in a U-shaped cross section with an upward opening, and the base end portion on the opposite side of the lock pin 12 is provided with a reinforcing member 6.
It is pivotally attached by a pin 15 penetrating both side plates. Further, a torsion spring 16 fitted to the pin 15 is arranged inside the lever 14, and the torsion spring 16 allows the lever 1 to move.
4 is urged in a posture in which it is in close contact with the bottom surface of the reinforcing member 6.

Further, one end of the connecting rod 17 arranged inside the reinforcing member 6 is locked to the upper end of the base end portion of the lever 14, and the other end of the connecting rod 17 is exposed from the end portion of the reinforcing member 6. The handle 18 is locked. The handle 18 is slidably mounted inside the reinforcing member 6. Therefore, if the handle 18 is pulled from the direction of the front end of the top plate, as shown in FIG.
The lever 14 rotates against the spring 16 as shown in FIG. Then, the lock pin 12 escapes and rotates so as to be disengaged from the engagement grooves 10 and 11. As shown in FIG. 1B and FIG. 3, the lock member 8 is covered with a cover 19.

In the above-described structure, when the top plate 5 is in a horizontally tilted position, as shown in FIG. 3, the lock pin 12 is inserted into the first engaging groove 10 while the top plate 5 is supported by the lateral beam 4. The top plate 5 is held in such a manner that it cannot be flipped up and rotated because it is fitted and engaged. Then, when the handle 18 is pulled, the lock pin 12 is disengaged from the first engagement groove 10 as shown in FIG. 4 (A), and the top plate 5 is unlocked.

When the top plate 5 is unlocked and then the top plate 5 is slightly raised and the hand is released from the handle 18, the lock pin 12 contacts the guide surface of the lock member 8 and the top plate 5 is released.
When the elongated hole 13 and the second engagement groove 11 are aligned by rotating to the upright position, the lock pin 12 automatically fits and engages with the second engagement groove 11 by the elastic restoring force of the torsion spring 16.
As a result, the top plate 5 is locked in the upright state.

Since the engagement grooves 10 and 11 extend in the radial direction from the center of rotation of the top plate 5, the lock pin 1 is provided.
The direction in which 5 is pulled out and the direction in which the top plate 3 is rotated are substantially perpendicular to each other. Therefore, the lock pin 12 has the engagement grooves 10, 11
The top plate 5 is prevented from rotating in any direction in the state of being fitted in the position, and as a result, the top plate 5 can be reliably locked in the upright state in the horizontal state.

When the arc-shaped guide surface 8a of the lock member 8 is provided as in this embodiment, when the top plate 5 is tilted, the lock pin 12 is engaged with the engagement grooves 10 and 11 by so-called kicking engagement. This is more preferable because it can be automatically and reliably engaged with each other. The locking device may be provided only at one of the reinforcing members 6,
You may provide in the place of both reinforcement members. Further, the reinforcing member 6 may be provided in the central portion on the left and right of the top plate 5, and one locking device may be provided at that portion. When installing lock devices on both left and right sides of the top plate 5, one lever can be used to handle two levers 1.
4 may be configured to be rotated simultaneously.

By the way, it is preferable that the table 1 is held so as not to move on the floor surface during use, and it is desirable that it can be easily moved when moving to a storage place or the like. So Table 1 above
Is to selectively ground one of the casters 3 and the grounding body 21 on the floor in conjunction with the operation of raising and lowering the top 5.
The table 1 is fixed on the floor or movable. This point will be described below with reference to FIGS.

As shown in the separated perspective view of FIG.
Is formed in a substantially T-shape by a hollow pillar 2a having an oval cross section and a horizontal rod 2b having a downward opening fixed to the lower end thereof by welding or the like. Inside the horizontal rod 2b, the entire length thereof is formed. The extending bottom plate 22 is fixed by welding or the like. Inside the horizontal rod 2b, a seesaw body 23 extending from a lower portion of the column 2a toward a rear end of the horizontal rod 2b is arranged, and a front and rear midway portion of the seesaw body 23 is provided on the bottom plate 22 in a protruding manner. A pin 25 is pivotally attached to the bracket piece 24. Further, a torsion spring 26 is fitted on the pin 25, as shown in FIG.
As shown in (B), the seesaw body 23 is biased by the torsion spring 26 so that the rear end thereof faces downward.

Then, the rear caster 3 is attached to the rear end of the seesaw body 23 through the through hole 27 formed at the front end of the bottom plate 22. Therefore, seesaw body 23
When is rotated against the torsion spring 26, the rear caster 3 moves up and down. The front caster 3 is fixed to the front end of the bottom plate 22 so as not to move vertically. Further, the grounding body 21 is fixed to a portion of the bottom plate 22 near the rear end that does not come into contact with the casters 3. The grounding body 21 is set so as to be grounded to the floor surface A when the caster 3 at the rear part moves up.

Further, a rod 28 having a lower end engaged with the tip of the seesaw body 23 is arranged on the column 2a of the leg, and the rod 28 is projected above the column 2a. The rod 28 is slidably held by a cap 29 attached to the upper end of the column 2a. Then, as shown in FIG. 6 and as shown by the alternate long and short dash line in FIG. 8B, when the top plate 5 is laid horizontally, the rod 28 is pressed downward and the seesaw body 2 is pressed.
3 is rotated against the torsion spring 26, the caster 3 at the rear part is raised, and the grounding body 21 is set on the floor surface A.

As described above, when the top plate 5 is tilted horizontally, the grounding body 21 comes into contact with the ground, so that the displacement movement of the table 1 is prevented, and when the top plate 5 is raised, the torsion spring 2
Since the caster 3 at the rear portion is grounded by 6, the table 1 can be easily moved. The grounding body 21
The height may be adjustable. In the present invention, the lock member may be attached to the leg.

[Brief description of drawings]

FIG. 1A is a partial perspective view of a table according to the present invention,
(B) is a BB sectional view of (A).

FIG. 2 is an exploded perspective view of a main part.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a diagram showing an operation.

FIG. 5 is a diagram showing an operation.

FIG. 6 is a partial front view of the table.

FIG. 7 is an exploded perspective view of the inside of a leg.

FIG. 8A is an exploded perspective view of an upper portion of the leg body, and FIG. 8B is a partially cutaway left side view of the leg body.

[Explanation of symbols]

 1 Table 2 Leg 4 Horizontal Beam 5 Top Plate 6 Reinforcement Member 8 Lock Member 9 Support Shaft 10, 11 Engagement Groove 12 Lock Pin 14 Lever 16 Torsion Spring 18 Handle

Claims (1)

[Claims] 1. A foldable table in which left and right leg bodies are integrally connected by a horizontal beam, and a top plate is pivotally attached to the horizontal beam or the leg body so as to be pivotable so as to be rotatable. A lock member is provided on the leg body such that an outer peripheral surface thereof extends around a rotation center of the top plate, and at least a pair of engagement members extending in a radial direction from the rotation center of the top plate is provided on an outer peripheral portion of the lock member. The mating grooves are provided at a rotation angle of the top plate, and on the lower surface of the top plate in the vicinity of the lock member, in the pair of engagement grooves in the lock member in relation to the up and down movement of the top plate. A lock pin that selectively fits is movably provided so that it can be disengaged from the engagement groove by lever operation, and spring means that urges the lock pin to fit in the engagement groove is provided. , A top plate in a folding table characterized by Locking device.