JPH08126527A - Folding desk - Google Patents

Abstract

PURPOSE: To provide a folding desk, which has no projection on which clothes are hooked so as to use safely and has such a structure as to facilitate a folding operation. CONSTITUTION: One end of a Y-shaped support arm 10 is engaged with leg part 3 fitted to the back 2 of a top plate 1 by fittings in such a manner as to freely rotate, a slide member 11 is formed on the other end of the support arm 10, and the slide member 11 is held on a rail member 14 disposed on the back 2 of the top plate 1 in such a manner as to freely slide. Engaging projections are held in the state of being elastically energized outward on both end parts of the slide member 11, and with the pull-out operation of the leg parts 3, the engaging projections are engaged with engagement holes 14a bored in the rail member, whereby the support arm 10 is locked so that the leg parts 3 are held in the footing state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foldable desk, and more particularly to a foldable desk having a characteristic folding structure of its legs.

[0002]

2. Description of the Related Art There are known various types of folding desks intended to save space when not in use by folding a leg portion, and one of them is a folding desk as shown in FIG. .

FIG. 1 is a view of the back surface 2 side of the top plate 1. In this case, the legs 3 are formed in a U-shape, and the base thereof is attached to the back surface 2 of the top plate 1 by a mounting bracket 4. A support arm 6 that is movably attached and is foldable by a connecting fitting 5 is provided between the leg portion 3 and the top plate 1.

The connecting fitting 5 is a first V-shaped member.
The support arm 6a and the second support arm 6b formed in a substantially U-shape can be connected to each other at their ends to be folded.

That is, the connecting fitting 5 is fitted into the V-shaped apex of one end of the first supporting arm 6a and is integrally connected by the claw 5a, and the second supporting arm 6b is U-shaped. The open end 6c is bent outward and is elastically engaged with the engaging hole 5b formed at the side of the connecting fitting 5 in a fitted state.

The other end portion of the first support arm 6a is fitted into the engagement hole 3a of the leg portion 3 and is rotatably engaged with it. Further, the other end of the second support arm 6b is rotatably attached to the back surface of the top plate 1 by a mounting member 7.

The connecting fitting 5 has a U-shaped cross section, and the open portion 5c has an arc-shaped upper plate 5f parallel to the bottom plate 5e from the open end of the side wall 5d.
Extend between the top plate 5f and the bottom plate 5e
A lock portion 5g for holding the wire portion of the support arm 6b is formed. A sliding portion 5h on which the second support arm 6b slides is formed on the end surface of the upper plate 5f.

In such a structure, when the leg portion 3 is folded, the parallel portions 6d, 6 of the second support arm 6b.
Press d inward in the direction of arrow A to make the parallel parts 6d, 6d
When the connection part 5 is pushed inward from the lock part 5g and the connecting metal part 5 part is pushed toward the back surface side of the top plate 1 (direction of arrow B), the outer parts of the parallel parts 6d, 6d of the second support arm 6b are elastically deformed. While moving along the sliding portions 5h and 5h, the leg portion 3 rotates in the direction of arrow C accordingly, and the second supporting arm 6b
When touches the back surface 2 of the top plate 1, the leg portions 3 also touch the back surface of the top plate 1, and the leg portions 3 are folded.

On the other hand, when the leg portion 3 is erected, the reverse operation is performed. If the leg portion 3 is raised from the back surface 2 of the top plate 1 and rotated in the direction of arrow D, the connecting metal fitting 5 portion is accompanied. Also moves in the direction of arrow E and is separated from the back surface 2 of the top plate 1. In this process, the parallel portions 6d and 6d of the second support arm 6b slide along the sliding portion 5h of the connecting fitting 5 while the distance between them is reduced. And the parallel portions 6d, 6d
When the sliding portion 5h passes through the most protruding portion of the sliding portion 5h, the elastic restoring force opens the parallel portions 6d, 6d, and finally fits in the lock portion 5g and the first support arm 6
a, the connecting member 5, and the second support arm 6b are aligned, and the leg portion 3 is locked at the standing position.

[0010]

By the way, in this conventional example, as shown in FIG. 3, the end portion 6c of the second support arm 6b is engaged with the engagement hole 5b of the connecting fitting 5. Since it projects from the hole of the engagement hole 5d, for example, in a kindergarten or the like, when a kindergarten enters the back side of the top plate 1 and plays, there is a possibility that clothes or skin may be caught on the end 6c. There was a dangerous side.

When folded with the leg portion 3, the parallel portions 6d, 6d are not contracted in the direction of arrow A as described above,
There is a case where the connecting member 5 is hit from above to forcibly fold the leg portion 3 in one step, which is a cause of damage.

The present invention has been made in view of the actual situation of such a conventional folding desk, and its object is to minimize the danger during use because there is no protrusion that catches clothes or skin. (EN) It is possible to provide a folding desk that can be easily folded and can be easily folded without requiring a large amount of force.

[0013]

To achieve the above object, the present invention has a leg portion rotatably attached to the back surface of the top plate, and the leg portion is attached to the top plate of the top plate as needed. In a folding machine which is used by raising it from the back surface at a substantially right angle, one end is pivotally supported by the leg portion and a support arm is provided with a slide member at the other end, and the slide member is fixed to the back surface of the top plate. And a rail member having a C-shaped cross section for slidably holding the slide member, wherein the slide member has a cylindrical body whose axis is oriented in a direction orthogonal to the sliding direction of the slide member, and which appears at both ends of the cylindrical body. The rail member includes a pair of engagement projections that can be provided and spring means that urges the engagement projections in the cylindrical body toward the outside. Raised almost right from the back of the plate Fitted with the engaging protrusions in standing position, it is characterized in that the engagement hole for locking the disabling rotation of the leg in its standing position is formed.

In this case, it is preferable that the rail member is provided with a stopper that prevents the slide member from moving to the leg side from the position of the engaging hole. Also,
While obtaining a reliable engagement state between the engagement protrusion and the engagement hole,
In order to easily disengage the engagement, an engaging portion formed of an engaging surface parallel to the inner surface of the engaging hole in the engaging protrusion and a hemispherical surface continuous to the engaging surface. It is preferable to form an insertion guide part having a shape.

[0015]

According to the above construction, when the legs are to be set up for use with the desk, if the legs are raised from the back side of the top plate, the slide member slides along the rail member, and When the mating protrusion faces the engaging hole, the engaging protrusion is fitted into the engaging hole by the spring means, whereby the leg portion is locked in its standing position.

In this state, the slide member is almost in contact with the stopper, and when the leg portion is folded with the engaging projection being depressed from the engaging hole by the finger, the leg portion cannot be expanded more than 90 degrees. It is like this.

On the other hand, when the leg portion is folded from its standing position, if the engaging projection exposed from the engaging hole is slightly pushed and the slide member is moved in the original direction, the leg portion is gradually moved to the top plate. It falls on the back side and is finally brought into close contact with the back side and folded. At that time, if the tip side of the engaging projection is formed in a spherical shape, the inner edge of the engaging hole comes into contact with the spherical surface only by slightly pushing the engaging projection, and the engaging projection is engaged with a light force. The state is released.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing the back surface of a folding desk according to this embodiment, and FIG. 2 is an enlarged cross-sectional view of a main part showing a mounting state of a slide member and a rail member on a top plate.
In these figures, the same reference numerals are given to the respective parts equivalent to those of the conventional example shown in FIG. 3, and duplicated description will be omitted.

This folding machine has a support arm 10 formed in a substantially Y-shape. One end of the support arm 10 on the bifurcated side is rotatably engaged with the leg portion 3, and the other end is provided. The slide member 11 is integrally provided. The slide member 11 has a cylindrical body 11a, and the spring 1 inserted into the cylindrical body 11a is provided at both ends of the cylindrical body 11a.
A pair of engagement protrusions 13 and 13 elastically biased in a direction (outside) away from each other by 2 are provided.

Each engaging projection 13 has a base portion 13a formed in a cylindrical shape having a diameter larger than that of an engaging hole 14a described later, and an engaging portion 13b engaging with the engaging hole 14a has an engaging hole 14a. It is formed in a cylindrical shape having a diameter slightly smaller than the inner diameter of, and a hemispherical fitting guide portion 13c is provided on the tip side thereof.

The slide member 11 is slidably held in a rail member 14 attached to the back surface of the top plate 1. In this case, the slide member 11 has its axis line orthogonal to the sliding direction of the slide member 11, and the rail member 14
Is inserted into.

The rail member 14 is formed to have a substantially C-shaped cross section, and guides 14b, 14b having opposite L-shapes on both sides thereof.
The slide member 11 is prevented from coming off, and the slide member 11 is surely slid by the guides 14b and 14b.

The back plate portion 14c of the rail member 14 is fixed to the back surface 2 of the top plate 1 by screws 15. Further, on the side of the rail member 14 on which the leg portion 3 is attached, there is provided an engaging hole 14a into which the engaging portion 13b of the engaging protrusion 13 is fitted, corresponding to the position (standing position) when the leg portion 3 is erected. A stopper 14d for preventing the slide member 11 from coming off is cut and raised at the back plate portion 14c of the rail member 14 corresponding to this fitting position.

Next, the operation of this folding desk will be described. When the leg portion 3 is raised from the back side of the top plate 1 in the direction of the arrow J, the slide member 1 is moved according to the movement.
1 moves in the direction of arrow F in the rail member 14, and when the fitting guide portion 13c of the engaging projection 13 reaches the position facing the engaging hole 14a, the fitting force of the spring 12 causes the fitting guide portion 13c to engage. The engaging portion 1 is fitted in the dowel hole 14a
3b is fitted into the inner surface of the engagement hole 14a and is in a locked state. As a result, the leg portion 3 is reliably supported by the support arm 10 in its standing position, and stably supports the top plate 1.

When the legs 3 are folded from this state,
The insertion guide portion 13c at the tip of the engaging projection 13 is slightly pushed in against the elastic force of the spring 12 (direction of arrow H), and then,
When the leg portion 3 is folded in the direction of the arrow G, the engagement state of the engagement portion 13b of the engagement protrusion 13 is released, the slide member 11 slides in the direction of the arrow I, and finally the leg portion 3 is moved to the top plate 1. It is folded up to the position along the back surface 2.

When the lock is released, since the fitting guide portion 13c is formed in a hemispherical shape, the engaging projection 1 can be obtained by pushing in by a dimension substantially corresponding to the plate thickness of the rail member 14.
The engagement state of 3 is released, and it can be operated with a relatively small force.

Although the slide member 11 is formed of the cylindrical body 11a in the above-mentioned embodiment, it may be a rectangular cylindrical body depending on the case. Also, the support arm 10 may be T-shaped.

[0028]

As described above, according to the present invention,
The following effects are obtained. That is, according to the invention as set forth in claim 1, the slide member slides in the rail member in association with the operation of causing the leg portion to be caused from the back surface of the top plate, and the engagement protrusion automatically moves into the engagement hole at the standing position. The lock state of the support arm can be released simply by pressing the engagement protrusion against the elastic force of the spring means when the support arm is folded, so that the support arm can be handled very easily. It is also safe because there are no wire rods and other protrusions that are dangerous in use as in the past. Further, the number of parts is smaller than that of the conventional example and the structure is simple. Therefore, the cost can be reduced including the number of assembling steps.

According to the invention as set forth in claim 2, wherein the rail member is provided with a stopper for preventing the slide member from moving to the leg portion side from the position of the engaging hole, when the leg portion is folded,
It is possible to prevent an erroneous operation in which the legs are erroneously opened by 90 degrees or more.

3. An engaging projection, which is provided with an engaging portion formed of an engaging surface parallel to the inner surface of the engaging hole, and a hemispherical fitting guide portion connected to the engaging surface. According to the invention described in (1), since the engagement state can be released by merely pushing the engagement portion of the engagement projection to a position facing the inner wall of the engagement hole, for example, by a child or a woman who has no strength. Can also be easily operated.

[Brief description of drawings]

FIG. 1 is a perspective view showing a back surface of a folding desk according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part showing a relationship between a support arm, a slide member, and a rail member of the folding desk according to the above embodiment.

FIG. 3 is a perspective view showing a back surface of a folding desk according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Top plate 2 Back surface 3 Leg part 10 Support arm 11 Sliding member 11a Cylindrical body 12 Spring 13 Engaging protrusion 13a Base part 13b Engaging part 13c Fitting guide part 14 Rail member 14a Engaging hole 14b Guide 14c Back plate part 14d Stopper

Claims (3)

[Claims] 1. A folding desk which has leg portions rotatably attached to the back surface of a top plate and which is used by raising the leg portions from the back surface of the top plate at a substantially right angle, if necessary. A support arm having one end pivotally supported by the section and a slide member provided at the other end; and a rail member fixed to the back surface of the top plate and having a C-shaped cross section for slidably holding the slide member. The slide member includes a cylindrical body whose axis is oriented in a direction orthogonal to a sliding direction of the slide member, a pair of engaging projections provided at both ends of the cylindrical body so as to be retractable, and the cylindrical body. In addition, the rail member has spring means for urging the engaging projections outwardly, and the rail member has the leg portion at a standing position in which the leg portion is raised substantially at right angles from the back surface of the top plate. Fit the mating protrusion, A folding desk characterized in that an engaging hole for non-rotatably locking is formed at a standing position. 2. The rail member is provided with a stopper for preventing the slide member from moving to the leg portion side from the position of the engagement hole. Folding desk. 3. The engagement protrusion comprises an engagement portion formed of an engagement surface parallel to the inner surface of the engagement hole, and a hemispherical fitting guide portion continuous with the engagement surface. The folding desk according to claim 1, wherein the folding desk is provided.