JP3039995U - Folding desk - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED: To provide a folding desk in which a supporting leg can be erected or tilted down by a simple operation, and there is no fear of the supporting leg unexpectedly falling. SOLUTION: The folding desk is composed of a top plate 10 and support legs 20 which are attached to a lower surface of the top plate 10 so as to be able to move up and down. The side plate 11 that contacts the upper side surface of the support leg 20 on the lower surface of the top plate 10.
10, the positioning protrusion 23 is provided on the outer surface of the upper portion of the support leg 20.
Is provided so as to be retractable, and the side plate 1110 is provided with a locking hole 1140 with which the positioning projection 23 is detachably engaged.
The locking plug 33 is slidably housed inside the side plate 140, and the side plate 1
The operation dial 32 is rotatably attached to a position where the locking hole 1140 on the outer surface of the 110 is closed, and the inner surface of the operation dial 32 is formed with a concave portion to which the tip of the locking plug 33 is detachably engaged.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a folding desk suitable for a study desk, a dining table, a conference desk, and the like.

[0002]

[Prior art]

 Conventionally, a large number of folding desks in which a plurality of support legs are rotatably attached to the lower surface of a top plate are known. In such a folding desk, each support leg is composed of a U-shaped spring, and when the support leg is erected, its upper end opens and moves along the groove of the receiver attached to the top plate. The one that maintains the upright state, or the protrusion that is provided on the upper end of the support leg when it is erected is pushed out by the spring and engages with the receiver on the top plate side to maintain that state. There is something.

However, when these desks are folded, operations such as compressing the support leg against the force of the spring and compressing the support leg or pushing the operation lever must be continued until the support leg falls down by a certain angle. However, it is not only troublesome to perform such an operation while supporting a heavy desk, and to defeat the supporting legs, but it requires a considerable amount of force. Further, since the protrusions and the like projected by the spring are exposed on the outer surface, there is a possibility that the support leg may unexpectedly fall down if an object hits the protrusion and accidentally pushes the protrusion.

[0004]

[Problems to be solved by the device]

 It is an object of the present invention to provide a folding desk that allows the support legs to be erected or tilted by a simple operation and does not have the risk of the support legs accidentally falling.

[0005]

[Means for Solving the Problems]

 The folding machine of the present invention comprises a top plate and supporting legs mounted on the lower surface of the top plate so that the supporting legs can be tilted up and down. Side plates contacting the upper side surfaces of the supporting legs are provided on the lower surface of the top plate. A positioning projection is provided on the outer surface so that the positioning projection is retractable, and at the position corresponding to the positioning projection when the support leg stands up, a locking hole is formed in the side plate so that the positioning projection is detachably engaged. The locking plug is slidably housed inside, and the operation dial is rotatably attached to the outer surface of the side plate at a position where it closes the locking hole, and the tip of the locking plug is removable on the inner surface of the operation dial. Form a mating recess.

When the support leg is raised with the concave portion of the operation dial facing the locking hole of the side plate and the positioning protrusion of the support leg is engaged with the locking hole of the side plate, the locking plug is pushed out by the positioning protrusion. Then, the tip of the locking plug protrudes to the outside of the side plate and engages with the concave portion of the operation dial, and as a result, the rotation of the support leg is restricted. Also, at this time, the tip of the locking plug is hidden by the operation dial, so that even if an object hits, it will not sink into the side plate.

When the operation dial is rotated, the positions of the concave portion and the locking plug are displaced so that the locking plug is pushed into the locking hole, and further, the positioning protrusion is formed on the support leg by the base end portion of the locking plug. It is pushed inside. Then, the engagement between the positioning protrusion and the locking hole is released, and the support leg is rotatable with respect to the side plate. In addition, this state is maintained even if you release your hand from the operation dial.

In some cases, a spring for urging the positioning protrusion in the protruding direction is fixed to the positioning protrusion and the spring is housed in the support leg. With this arrangement, the positioning projection is automatically engaged with the locking hole only by aligning the recess of the operation dial with the locking hole and raising the support leg. Further, it is desirable that the support leg has its upright rod curved outwardly in a convex shape. Further, it is desirable to form reinforcing ribs on the lower surface of the top plate.

[0009]

[Embodiment of the invention]

 As shown in FIG. 1, the folding desk of the present invention comprises a top plate 10 having an appropriate shape (rectangular shape in the example shown in the figure) and a plurality of support legs 20 which are mounted on the lower surface of the top plate 10 so as to be able to move up and down. Become. Reinforcing ribs 1010 are formed along the outer periphery of the lower surface of the top plate 10 so that deformation such as warpage does not occur. Further, the receiving members 11 are attached to the four corners of the lower surface of the top plate 10, respectively. Each receiving member 11 has a pair of parallel side plates 1110 that hang down with a space therebetween, and a through hole 1120 is formed in an upper portion of the opposing side plates 1110. A positioning piece 1150 is provided between the outer edges of the pair of side plates 1110 to contact the supporting leg 20 when the supporting leg 20 stands up to the normal position.

The support leg 20 is formed by bending a hollow pipe, and a standing rod 21 is erected at both ends of a bottom rod 26 to have a substantially U-shape. Further, the upper part of the standing rod 21 is slightly curved outwardly in a direction intersecting with the bottom rod 26 so that the supporting leg 20 is inclined downward and outward when the support leg 20 is erected. While the upper part of the upright rod 21 is inserted between the side plates 1110 of the respective receiving members 11, the through shaft 1120 of the side plate 1110 and the attachment hole 22 formed near the upper end of the upright rod 21 are pivotally supported. The support leg 20 is rotatably attached to the top plate 10 by inserting a bolt serving as 31.

Between the support leg 20 and the one side plate 1110 that contacts the upper side surface of the support leg 20, the following upright holding device for the support leg 20 is provided. As shown in FIG. 2, the upright rod 21 of the support leg 20 is provided with an insertion hole 25 that communicates the inside and outside of the upright rod 21 with the insertion hole 25 slightly below the mounting hole 22. Fit freely. One end of a V-shaped spring 24 is fixed to the base end portion of the positioning protrusion 23, and this spring 24 is built in the upright rod 21 and the other end is fixed to the inner surface of the upright rod 21. Then, the positioning protrusion 23 is biased outward by the spring 24, and the tip of the positioning protrusion 23 projects outward of the upright rod 21 in a normal state.

As shown in FIGS. 3 and 4, a locking hole 1140 is formed in a lower portion of one side plate 1110 at a position corresponding to the positioning protrusion 23 when the support leg 20 is erected. The inner portion of the locking hole 1140 is a neck portion 1141 having a slightly smaller diameter than the outer portion, and the diameter of the neck portion 1141 is formed to be slightly larger than the diameter of the positioning protrusion 23. Further, the locking hole 1140 slidably accommodates a locking plug 33 having the same shape as the shape of the locking hole 1140 in which the small diameter portion is provided inside the large diameter portion. The large diameter portion of the locking plug 33 is caught by the neck portion 1141 of the locking hole 1140 and is prevented from falling inside the side plate 1110. The peripheral edge of the large diameter portion of the locking plug 33 is smoothly chamfered.

On the outer surface of the side plate 1110, a pivot metal fitting 1130 is provided so as to project between the locking hole 1140 and the through hole 1120, and the operation dial 32 is rotatably mounted via the pivot metal fitting 1130. A shaft hole 3210 is formed along the central axis of the operation dial 32, and a locking rib 3211 and a concave groove 1131 are formed on the inner circumference of the shaft hole 3210 and the outer circumference of the pivot fitting 1130, respectively. The operation dial 32 is attached to the outer surface of the side plate 1110 so as to close the locking hole 1140 by inserting the shaft into the shaft hole 3210 and engaging the locking rib 3211 with the groove 1131.

A knob projection 3221 is provided on the surface of the operation dial 32 along the diameter thereof, and behind the knob projection 3221, a position corresponding to the locking hole 1140 on the inner surface of the operation dial 32. A recess 3220 is formed in The diameter of the recess 3220 is formed to be slightly larger than the large diameter portion of the locking plug 33, and when the recess 3220 and the locking hole 1140 match, the tip of the locking plug 33 is engaged with the recess 3220. ing.

When using the folding desk, as shown in FIG. 5, the supporting leg 20 is raised and brought into contact with the positioning piece 1150 of the receiving tool 11. Then, as shown in FIG. 3, the positioning projection 23 of the upright rod 21 automatically matches with the locking hole 1140 of the side plate 1110. Next, when the operating dial 32 is turned to bring the knob projection 3221 along the upright rod 21, the recess 3220 of the operating dial 32 is aligned with the locking hole 1140.

Since the positioning projection 23 is biased by the spring 24, the positioning projection 23 enters into the locking hole 1140, whereby the locking plug 33 is pushed outward, and the tip thereof is the recess 3220 of the operation dial 32. Engage with. As a result, the rotation of the standing rod 21 and the side plate 1110 is restricted, and the supporting leg 20 cannot be tilted. It should be noted that the operating dial 32 and the side plate 1110 may be provided with a matching scale, and the recess 3220 of the operating dial 32 and the locking hole 1140 may be aligned in advance to raise the supporting leg 20.

When folding the folding desk, as shown in FIG. 4, when the operation dial 32 is rotated, the positions of the recess 3220 and the engagement hole 1140 are displaced, so that the tip of the engagement plug 33 is located on the inner surface of the operation dial 32. It is pushed by and sinks inside the locking hole 1140. At this time, since the periphery of the tip of the locking plug 33 is chamfered, the operation dial 32 rotates smoothly without being caught by the locking plug 33. Then, the positioning projection 23 is pushed out by the locking plug 33 and comes out from the locking hole 1140, and the engagement between the support leg 20 and the side plate 1110 is released. As a result, as shown in FIG. 6, the support leg 20 can be rotated about the pivot 31 and tilted parallel to the top 10.

When the support leg 20 is U-shaped, the upright holding device including the operation dial 32, the locking plug 33, the positioning projection 23, and the like is provided only on the receiver 11 to which the upper end of the upright rod 21 is attached. Can be provided.

[0019]

[Effect of the invention]

 According to the configuration of claim 1, if the operation dial is rotated to align the concave portion with the locking hole of the side plate and raise the support leg to project the positioning protrusion, the support leg and the side plate are separated. Since the rotation is restricted, the support leg can be held in an upright state. Also, at this time, since the locking plug protruding to the outer surface of the side plate is hidden by the operation dial, even if an object is bumped or kicked inadvertently, there is no risk of the support leg accidentally falling.

Further, the engagement between the support leg and the side plate is released only by rotating the operation dial to shift the positions of the recess and the locking hole, and this state is maintained even if the hand is released from the operation dial. Therefore, it is not necessary to perform the disengagement operation and the work of tilting the support legs at the same time, which reduces the labor required for folding.

According to the second aspect of the invention, the positioning protrusion is automatically engaged with the locking hole only by aligning the concave portion of the operation dial with the locking hole and raising the support leg. Therefore, the operation becomes easier. According to the configuration described in claim 3, it is possible to widen the width between the raised support legs. According to the structure of claim 4, deformation such as warpage of the top plate is prevented.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a folding desk showing an embodiment of the present invention.

FIG. 2 is a perspective view of a main part of a support leg.

FIG. 3 is a cross-sectional view of the main parts of the folding desk when the support legs are raised.

FIG. 4 is a cross-sectional view of the main parts of the folding desk when the support legs are tilted down.

FIG. 5: Side view of the folding desk in use

FIG. 6 is a side view of the folding desk in a folded state.

[Explanation of symbols]

 10 Top Plate 11 Receiving Tool 20 Support Leg 21 Standing Rod 22 Mounting Hole 23 Positioning Protrusion 24 Spring 25 Insertion Hole 26 Bottom Rod 31 Pivot Shaft 32 Operation Dial 33 Locking Plug 1010 Reinforcing Rib 1110 Side Plate 1120 Through Hole 1130 Pivot Fitting 1131 Recess Groove 1140 Locking hole 1141 Neck part 1150 Positioning piece 3210 Shaft hole 3211 Locking rib 3220 Recessed part 3221 Knob

Claims (4)

[Utility model registration claims] 1. A top plate and a support leg which is attached to a lower surface of the top plate so as to be able to move up and down. A side plate which comes into contact with an upper side surface of the support leg is provided on the lower surface of the top plate, A positioning protrusion is provided on the outer surface of the upper portion so as to be retractable, and a locking hole for detachably engaging the positioning protrusion is formed in the side plate at a position corresponding to the positioning protrusion when the support leg stands upright. The locking plug is slidably stored inside the stop hole,
On the outer surface of the side plate, an operation dial is rotatably attached to a position that closes the locking hole, and a concave portion is formed on the inner surface of the operation dial to detachably engage the tip of the locking plug. Folding desk. 2. The folding machine according to claim 1, wherein a spring for urging the positioning projection in the projecting direction is fixed to the positioning projection, and the spring is built in the support leg. 3. The folding desk according to claim 1, wherein the support leg has a rising rod curved outwardly in a convex shape. 4. The folding machine according to claim 1, wherein a reinforcing rib is formed on a peripheral edge of a lower surface of the top plate.