JPH0537775Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a locking device for a folding table.

[Conventional technology]

Conventionally, as shown in FIGS. 6 and 7, in a folding table having a top plate 3 that can be raised and lowered at the upper ends of supporting legs 1 and 2, a locking device has been used to lock the top plate 3 in a horizontal use state. Both supporting legs 1, 2
An interlocking rod 4 is rotatably inserted between the interlocking rods 4 and 4.
A pair of locking means 5, 6 consisting of a locking plate and a locking pin are provided on both sides of the lever, and operating handles 7, 8 for operating the locking means 5, 6 are fixedly attached to both ends of the interlocking rod 4.

[Problem to be solved by the invention] In the conventional locking device, a pair of locking plates constituting the locking means are provided so as to be slightly freely rotatable with respect to the interlocking rod 4, and when the top plate 3 is in a horizontal state, the locking plates cannot be operated. When the handles 7 and 8 are locked, safety is ensured by ensuring that even if one of the lock plates of the lock means 5 and 6 is in the unlocked state, the other lock plate is locked. Therefore, when one of the locking means 5, 6 is in the unlocked state, the operating handles 7, 8 are in a half-locked position. Therefore, when the operating handles 7 and 8 take a vertical position as shown in Fig. 7 when in the fully locked state, when the operating handles 7 and 8 are in the half-locked state as described above, they take an inclined position as shown by the chain line. Even though they are locked, the appearance of the operating handles 7 and 8 deteriorates, resulting in a problem that the product value is diminished.

Therefore, in the present invention, when one of the pair of locking means is locked, the operating handle is placed in a vertical position so as not to damage its appearance, thereby increasing its commercial value.

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention has an interlocking rod 4 rotatably installed between the left and right support legs 1 and 2, and a pair of locks at both ends of the interlocking rod 4 to lock the usage pattern of the top plate 3. A handle shaft 9 is extended and connected to the end of the interlocking rod 4 so that the plate 13 can rotate slightly freely relative to the interlocking rod 4,
The operating handle 7 is fixed to the outer end of the handle shaft 9, and the operating handle 7 and the supporting leg 1 are provided with posture control means for always urging the operating handle 7 into a vertical posture. .

[Effect]

When locking the usage pattern of the top plate 3,
Even when one of the pair of lock plates 13 is in the unlocked state and the interlocking rod 4 does not completely return to the locked state, the handle shaft 9 can rotate slightly with respect to the interlocking rod 4, so the attitude control means The operating handle 7 automatically returns to the vertical position together with the handle shaft 9.

〔Example〕

Next, an embodiment of the present invention shown in the drawings will be described.

The present invention is used in the folding table shown in FIGS. 6 and 7. That is, a top plate 3 is provided between the supporting legs 1 and 2 so that it can be raised and lowered into a folded form shown by a chain line in FIG. Operating handles 7 and 8 are provided at both ends of the interlocking rod 4, which is rotatably inserted therethrough.

Next, the locking device of the present invention will be explained in detail with reference to FIGS. 1 to 5.

In FIG. 1, a handle shaft 9 is rotatably inserted through a leg cover 2a fixed to the upper part of the support leg 2, and an operating handle 7 is fixed to the outer end of the handle shaft 9.
The shaft 10 is fitted to the inner end side. As shown in FIG. 4, the handle shaft 9 is formed of a circular pipe.
The shaft 10 is formed with an oval cross section so that it can rotate slightly relative to the shaft 10. A pin 11 is fixedly provided through the shaft 10 so that both ends thereof protrude.
The shaft 10 is loosely fitted into a circumferentially long engaging hole 12 formed in the handle shaft 9. The right end of the shaft 10 protrudes from the inner end of the handle shaft 9.
The lock plate 13 is fitted into the mounting hole 13a formed in the base of the shaft 10. As shown in Fig. 3, the cross section of the shaft 10 is oval as described above, and the mounting hole 13a of the lock plate 13 is oval with both vertical faces slightly larger in diameter than both vertical faces of the shaft 10, so that the shaft 10 and the lock plate 13 can rotate slightly relative to each other.
The end of the interlocking rod 4 shown in the figure is fitted and fixed to the shaft 10 so as to rotate integrally with it. 14 denotes a seat plate. A hook 13b for locking is integrally formed on the upper end of the lock plate 13, and this hook is adapted to be hooked onto a lock pin 3b protruding from a frame material 3a fixed to the lower part of the top plate 3. 15 denotes a guide pin protruding from a hanging fitting 16, which is loosely fitted into a long guide hole 17 formed in the lock plate 13.
Reference numeral 8 denotes a spring, one end of which is engaged with the lock plate 13 and the other end of which is engaged with the guide pin 15, and which constantly urges the lock plate 13 in the direction of the lock pin 3b (the direction of the arrow A in Fig. 3). Next, the attitude control means for the operating handle 7 will be described. In Figs. 1 and 2, reference numeral 19 denotes a positioning pin that protrudes from the outer surface of the leg cover 2a. A recess 7a is formed on the rear surface of the operating handle 7, into which the positioning pin 19 protrudes. The relationship between the recess 7a and the positioning pin 19 is as follows:
As shown in Fig. 2, when the operating handle 7 is in a vertical position, the positioning pin 19 abuts against the side wall 7b of the recess 7a, and when the operating handle 7 is rotated in a direction in which the hook 13b of the lock plate 13 disengages from the lock pin 3b (direction B in Fig. 2), the positioning pin 19 moves within the recess 7a, allowing the operating handle 7 to rotate. Reference numeral 20 denotes a spring that returns the operating handle 7, one end of which is fixed to the back surface of the operating handle 7 and the other end is fixed to the positioning pin 19, and it constantly urges the operating handle 7 in the direction opposite to the arrow B.

Note that the lock device consisting of the above-mentioned parts is
They are provided on the left and right support legs 1 and 2 shown in the figure, respectively.

Next, the operation will be explained.

FIGS. 1 and 2 show that the hook 13b of the lock plate 13 is in a state of use in which the top plate 3 is laid down.
The figure shows the state in which it is engaged with the lock pin 3b and locked.

To fold the top plate 3 from this state to an upright state, first tilt the operating handle 7 in the direction of arrow B in FIG. As a result, the handle shaft 9 rotates integrally in the same direction, and the circumferential end of the elongated hole 12 hits the pin 11, causing the pin 11 to rotate in the same direction.
This rotation causes the shaft 10 to rotate in the same direction,
The lock plate 13 is rotated in the same direction to release the hook 13b from the lock pin 3b. As a result, the frame member 3a and lock pin 3b fixed to the top plate 3 can be moved upward (in the direction of the arrow C in FIG. 1), and the top plate 3 can be folded as shown by the chain line in FIG.

Next, the operation of changing the top plate 3 from the folded state to the usage state and locking it will be explained.

The operating handle 7 is returned to the locked position by a spring 20. When the top plate 3 is rotated in the horizontal direction in this state, the lock pin 3b descends and hits the upper surface of the hook 13b which has returned as shown in the figure. 13 is rotated and retracted in the direction of arrow B in FIG. When the lock pin 3b passes through the hook 13b, the lock plate 13 is rotated in the direction A in FIG. 3 by the spring 18, and the hook 13b is engaged with the lock pin 3b as shown in the figure and locked. At this time, both supporting legs 1 and 2
A pair of lock plates 13, 13 provided in the section
If both are properly engaged with the lock pins 3b, 3b, the operating handle 7 will also return to the vertical position as shown in FIG.

At this time, among the pair of lock plates 13, 13, one lock plate 13 was locked normally, but for some reason the tip of the hook 13b on the other lock plate 13 was stuck in the lock pin 3b as shown in FIG. may apply. In this case, as shown in FIG. 5, the other lock plate 13 does not return completely, and once the shaft 10 is caught in its mounting hole 13a, the shaft 10 and the interlocking rod 4 do not completely return to rotation and are rotated vertically. It stops in an attitude tilted by α from line 0. However, since the handle shaft 9 can rotate slightly with respect to the pin 11, that is, the shaft 10, due to the circumferentially elongated engagement hole 12 formed in the handle shaft 9, the spring 19 causes the operating handle 7 to rotate as shown in FIG. It can be rotated slightly in the direction opposite to the direction of arrow B. When the operating handle 7 reaches the vertical position, its side wall 7b hits the positioning pin 19, the rotation of the operating handle is stopped, and the vertical position is maintained.

[Effect of idea]

As described above, according to the present invention, even if one of the pair of lock plates is in the non-locked state during lock operation, the operating handle automatically assumes the vertical position, and the operating handle does not move as usual. The product does not stop at an inclined position and spoil the appearance, and the product value can be increased.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a front sectional view of the main part, FIG. 2 is a partially cutaway side view of the same, and FIGS. 3 and 4 are taken along line A-A in FIG. 1. 5 is a side view showing the lock plate and the unlocked state, FIG. 6 is a front view of a folding table to which the present invention is applied, and FIG. 7 is a side view of the same. 1, 2... Support leg, 3... Top plate, 3a... Lock pin, 4... Interlocking rod, 7... Operating handle, 7a
... recess, 9 ... handle shaft, 10 ... shaft, 11 ... pin, 11 ... engagement hole, 13 ...
...Lock plate, 19...Positioning pin, 20
……spring.

Claims (1)

[Scope of utility model registration request] An interlocking rod 4 is rotatably installed between the left and right supporting legs 1 and 2, and a pair of lock plates 13 for locking the usage pattern of the top plate 3 are attached to both ends of the interlocking rod 4.
A handle shaft 9 is provided at the end of the interlocking rod 4.
is extended and connected to the interlocking rod 4 so that it can rotate slightly freely, and the operating handle 7 is fixed to the outer end of the handle shaft 9. A locking device for a folding table, characterized in that it is provided with posture control means for biasing.