JP2984975B2 - Folding desk - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[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 legs, one of which is a folding desk as shown in FIG. .

[0003] Fig. 1 is a view of the back surface 2 side of a top plate 1, in which a leg 3 is formed in a U-shape, and its base is turned on a back surface 2 of the top plate 1 by a mounting bracket 4. A support arm 6 that is movably attached and that is foldable by a connection fitting 5 is provided between the leg 3 and the top plate 1.

[0004] A connecting metal fitting 5 is provided with a first V-shaped first fitting.
Of the second support arm 6a and the second support arm 6b formed in a substantially U-shape are connected to each other and can be folded.

That is, this connecting metal fitting 5 is fitted into the V-shaped apex portion of one end of the first support arm 6a and is connected so as to be integrated with the claw 5a, and the second support arm 6b is U-shaped. The open end 6c is bent outward and is elastically engaged with the engagement hole 5b formed in the side of the connection fitting 5.

[0006] The other end of the first support arm 6a is fitted into the engaging hole 3a of the leg 3, and is engaged so as not to be detachable and rotatable. The other end of the second support arm 6b is rotatably attached to the back surface of the top plate 1 by an attachment 7.

The connecting member 5 is formed to have a U-shaped cross section, and an open portion 5c has an arc-shaped upper plate 5f extending parallel to the bottom plate 5e from the open end of the side wall 5d.
Extends 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 an end surface of the upper plate 5f.

In such a configuration, when the leg 3 is folded, the parallel portions 6d and 6d of the second support arm 6b are
d inward in the direction of arrow A, and the parallel portions 6d, 6d
Is disengaged inward from the lock portion 5g, and when the connecting metal part 5 is pushed toward the back side of the top plate 1 (in the 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 parts 5h, 5h, the leg 3 rotates in the direction of the arrow C accordingly, and the second support arm 6b
At the time when abuts on the back surface 2 of the top plate 1, the leg portion 3 also abuts on the back surface of the top plate 1, and the leg portion 3 is folded.

On the other hand, when the leg 3 is to be erected, the operation is reversed. When the leg 3 is raised from the back surface 2 of the top plate 1 and turned in the direction of arrow D, the connection fitting 5 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, 6d of the second support arm 6b slide along the sliding portion 5h of the connection fitting 5 while reducing the interval. And the parallel parts 6d, 6d
Pass through the most protruding portion of the sliding portion 5h, the parallel rest portions 6d, 6d are opened by the elastic restoring force, and finally fit into the lock portion 5g, and the first support arm 6d
a, the connecting member 5 and the second support arm 6b are aligned, and the leg 3 is locked in the standing position.

[0010]

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

Also, when folding with the leg 3, the parallel portions 6d, 6d are not shrunk in the direction of arrow A as described above,
In some cases, the leg 3 is folded in a single step by hitting the connecting member 5 from above, which causes damage.

[0012] The present invention has been made in view of the drawbacks inherent in the related folding desk, the purpose, PL (manufactured
As a measure against legal liability, there are no protrusions that catch on clothes or skin, minimizing danger during use, and the folding operation can be easily performed without requiring much force. An object of the present invention is to provide a simple folding desk.

[0013]

In order to achieve the above object, the present invention has a leg portion rotatably attached to the back surface of a top plate, and the leg portion is attached to the top plate as necessary. in folding desk substantially right angle caused by using the back surface, one end of which it is pivotally supported on the legs, and the support arm slide member is provided on the other side and is fixed to the rear surface of the top plate, the slide and a C-shaped section rail member for holding the member slidably, the support arm, the
Bone with one end branched into two and the other end integrated
It includes a rating, the slide member, the other end of the support arm as the axis is orthogonal to the sliding direction of the slide member
A cylindrical body integrally connected to the side, a pair of engaging projections provided at both ends of the cylindrical body so as to be able to protrude and retract, and each of the engaging projections in the cylindrical body is urged outward. The rail member has a leg portion fitted with the engaging projection at a standing position where the leg portion is raised substantially at a right angle from the rear surface of the top plate, and the leg portion is moved to the standing position. An engagement hole that locks to prevent rotation, and the slide portion
The material moves to the leg side from the position of the engagement hole.
And a stopper for preventing the engagement.
The projection is formed of an engagement surface parallel to the inner surface of the engagement hole.
And a hemispherical fitting guide connected to the engaging surface.
And a door portion .

According to the above configuration, when the legs are to be erected to use 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 projection faces the engagement hole, the engagement projection is fitted into the engagement hole by the spring means, whereby the leg is locked in its standing position.

[0015] Incidentally, the slide member in this state is in a position to substantially contact with the stopper, when folding the legs of the engaging projection in a state where died from engaging hole with a finger, that spread the legs at least 90 degrees Never .

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

Further , according to the present invention, the support arm has a Y-shape.
Or it is a simple T-shaped skeleton,
However, the cylindrical body, including the connection with the support arm,
It is housed in a housing, which is dangerous for use as a whole.
It is also safe because there are no projections such as wire rods.

[0018]

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

This folding desk has a support arm 10 having a substantially Y-shaped skeleton. One end of the support arm 10 at the forked side is rotatably engaged with the leg 3 and the other end is at the other end. the slide member 11 are provided one body manner is. The slide member 11 has a cylindrical body 11a.
Are provided at both ends thereof with a pair of engaging projections 13, 13 elastically urged in directions (outside) away from each other by a spring 12 inserted into the cylindrical body 11a. In addition,
The support arm 10 may be T-shaped.

Each of the engagement projections 13 has a base 13a formed in a columnar shape having a diameter larger than that of an engagement hole 14a, which will be described later. And a hemispherical fitting guide portion 13c is provided at the tip end 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 is placed on the rail member 14 with its axis perpendicular to the sliding direction of the slide member 11.
Is inserted into.

The rail member 14 has a substantially C-shaped cross section, and has inverted L-shaped guides 14b on both sides thereof.
Prevents the slide member 11 from coming off, and the slide member 11 is reliably slid by the guides 14b, 14b.

The rail member 14 has its back plate 14 c fixed to the back surface 2 of the top plate 1 by screws 15. On the side of the rail member 14 on which the leg 3 is attached, an engagement hole 14a is provided in which the engagement portion 13b of the engagement protrusion 13 fits in a position (standing position) when the leg 3 is set up. A stopper 14d is formed on the back plate 14c of the rail member 14 to prevent the slide member 11 from being detached, corresponding to the fitting position.

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

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

For releasing the lock, since the fitting guide portion 13c is formed in a hemispherical shape, if the fitting protrusion 13c is pushed in by a dimension substantially corresponding to the plate thickness of the rail member 14, the engaging projection 1c is released.
3 is released, and can be operated with relatively small force.

[0027]

As described above, according to the present invention,
The following effects are obtained. That is , the slide member slides in the rail member in relation to the operation of raising the leg from the back surface of the top plate, the engaging protrusion automatically fits into the engaging hole in the standing position, and the engaging member is folded when folded. Since the locking state of the support arm can be released only by pressing the mating projection against the elastic force of the spring means, the handling can be performed extremely easily.

[0028] Moreover, there is also a safe because there is no projection such as a wire serving as the used like a conventional hazard. Further, the number of parts is small and the structure is simple as compared with the conventional example, so that the cost can be reduced including the number of assembling steps.

Further, the slide member to the rail member is a stopper for preventing the movement of the leg side of a position of the engaging hole
Since it is provided , when the leg is folded, an erroneous operation in which the leg is erroneously expanded by 90 degrees or more is prevented.

Furthermore, the engagement portion consisting of parallel engagement surfaces relative to the inner surface of the engaging hole in the engaging projection, and a continuously provided hemisphere surface shape fitting guide portion is provided in the engaging surface because there can be released the engagement just pushing slightly engaging portion of the engaging protrusion to a position opposed to the inner wall of the engaging hole. I
Thus , for example, it can be easily operated even by children or women and women without power.

[Brief description of the drawings]

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

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

DESCRIPTION OF SYMBOLS 1 Top plate 2 Back surface 3 Leg 10 Support arm 11 Slide member 11a Cylindrical body 12 Spring 13 Engagement projection 13a Base 13b Engagement portion 13c Fitting guide portion 14 Rail member 14a Engagement hole 14b Guide 14c Back plate Part 14d stopper

Claims (1)

(57) [Claims] 1. A has a leg portion pivotally attached to the rear surface of the top plate, if necessary in the folded desk using the legs causing substantially perpendicularly from the rear surface of the top plate, one end side It is pivotally supported on the legs, and the support arm slide member is provided on the other side and is fixed to the rear surface of the top plate, C-shaped section rail member for holding the slide member slidably wherein the door, the support arm, the one end
Side is branched into two, and the other end side is integrated into a single skeleton.
Provided, the slide member, as the axis is orthogonal to the sliding direction of the slide member on the other end of the support arm
A cylindrical body integrally connected, a pair of engaging projections provided at both ends of the cylindrical body so as to be able to protrude and retract, and a spring in the cylindrical body for urging each of the engaging projections outward; with a means, in the rail member, the leg portion is fitted with the engaging protrusions at the standing position caused almost perpendicularly from the rear surface of the top plate, rotating the leg in its stance position The engagement hole that locks impossible and the slide member
Prevents movement to the leg side from the position of the engagement hole
And a stopper for the engagement protrusion
Has an engagement surface parallel to the inner surface of the engagement hole.
A mating portion and a hemispherical fitting guide portion continuously provided on the engaging surface.
And a folding desk.