JP2002186523A - Desk - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a desk capable of preventing the collapse of legs. SOLUTION: When each leg 15 is rotated to stand upright, a crank 21 and a crank arm 27 are arranged in a linear position and the lock protrusion 26 of the crank 21 is engaged with the lock groove 33 of the crank arm 27. Accordingly, when an external force in the direction shown by an arrow A is exerted on the leg 15, the crank 21 and the crank arm 27 are maintained in the linear state, so that the leg 15 is prevented from opening in the direction shown by the arrow A. When an external force in the direction opposite to the direction shown by the arrow A, the crank 1 and the crank arm 27 are maintained in the linear state due to an engagement between the lock protrusion 26 and the lock groove 33, so that the leg 15 is prevented from closing. Each leg 15 is generally prevented from collapsing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a desk provided with a holding mechanism for holding a leg in an upright state.

[0002]

The conventional construction of the desk will be described with reference to FIG. One end of a top plate side arm 2 is connected to the lower surface of the top plate 1 so as to be rotatable about a shaft 3. One end of a leg side arm 4 is connected to the other end of the top plate side arm 2 so as to be rotatable about a shaft 5, and the other end of the leg side arm 4 is centered on a leg 6 around a shaft 7. Are rotatably connected to the The leg 6 is rotatably connected to the top 1 so as to be rotatable about a shaft 8. When the leg 6 is turned upright, the arm 2 between the top 2 and the leg 4 is in a straight line. become.

In the case of the above configuration, the leg 6 is opened in the opening direction (arrow A).
Direction), the top plate-side arm 2 and the leg-side arm 4 are held in a straight line, so that the leg 6 is prevented from opening in the direction of arrow A. However, when an external force acting in the closing direction (counter-arrow A direction) acts on the leg 6, the top plate-side arm 2 and the leg-side arm 4 bend in a “C” shape, so that the leg 6 is turned in the counter-arrow A direction Will close.

[0004] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a desk that can prevent the legs from falling down.

[0005]

According to a first aspect of the present invention, there is provided a desk, comprising: a leg rotatably connected to a top plate; a top plate-side arm rotatably connected to the top plate; A leg-side arm rotatably connected to both the top-side arm and being in a linear state with respect to the top-side arm in a standing state of the leg;
A lock groove provided on one of the top plate-side arm and the leg-side arm, and the leg provided on the other of the top plate-side arm and the leg-side arm being operated to be turned upright. And a lock projection that engages in the lock groove based on the above. According to the above-described means, when the leg is rotated to the upright state, the top plate side arm and the leg side arm are in a linear state, and the lock projection is engaged in the lock groove. Therefore, when an external force in the opening direction acts on the leg, the top plate-side arm and the leg-side arm are held in a straight line, so that the leg is prevented from opening. In addition, when an external force acts on the leg in the closing direction, the top plate-side arm and the leg-side arm are held in a linear state by the engaging force between the lock groove and the lock projection, so that the leg is prevented from closing.

[0006] The desk according to the second aspect is characterized in that the length of the top plate side arm is shorter than that of the leg side arm.
According to the above means, when the leg is rotated in the upright state, the relative movement distance of the lock projection with respect to the lock groove can be reduced. For this reason, variation in the movement locus of the lock projection relative to the lock groove is reduced, so that an engagement error between the lock projection and the lock groove is less likely to occur, and reliability is improved.

According to a third aspect of the present invention, there is provided the desk, wherein the operation portion for releasing the locking between the lock projection and the lock groove based on the rotational operation of the top plate side arm or the leg side arm is provided. It is characterized by being provided on the side arm. According to the above-described means, the leg-side arm and the top-plate-side arm relatively rotate by a one-touch operation of the operation unit, and the engagement between the lock projection and the lock groove is released, so that the leg folding operation can be performed. It's easy.

In the desk according to the fourth aspect, the lock protrusion enters the entrance of the lock groove immediately before the leg pivots to the upright state, and the lock protrusion engages the lock groove at the time when the leg pivots to the upright state. The feature is that it engages with the back. According to the above means, the operation of the leg can be weighted immediately before the leg rotates to the standing state. For this reason, the subsequent operation of the leg is performed against the weight, so that the operator can feel the response of operating the leg in the upright state, and the operation feeling of the leg is enhanced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the present invention is applied to a table. First, in (c) of FIG. 4, the top plate 11 has a horizontally long rectangular shape, and a top plate receiver 12 is screwed to the lower surface of the top plate 11 at both front and rear sides. Each of these top supports 12 is elongated along the front and rear sides of the top board 11, and each top support 12 is covered with an edge cap 13 at both left and right ends.
The leg bracket 14 is located near the edge cap 13.
Has been fixed.

As shown in FIG. 4A, a leg 15 is attached to each leg bracket 14 so as to be rotatable about a shaft 16, and a pair of legs 15 is provided at the left end of the top plate receiver 12. Leg 1
5 and a pair of legs 1 located at the right end of the top plate receiver 12.
As shown in FIG. 4C, the portions 5 are connected via a cylindrical connection bar 17. An edge cover 18 is fixed to a lower end surface of each pair of legs 15. Each of these edge covers 18 is formed in an elongated flat plate shape, and prevents the floor surface such as a folded surface from being damaged by the lower end surface of the leg 15.

Two arm brackets 19 are screwed to the lower surface of the top plate 11 at both left and right ends. As shown in FIG. 5, each of the arm brackets 19 has a substantially L-shape, and each of the arm brackets 19 has a circular through hole 20 formed therein.

[0012] Between each pair of arm brackets 19, FIG.
(A), the crank 21 corresponding to the top plate side arm is inserted. Each of the cranks 21 is formed of a synthetic resin containing a glass filler as a material, and a circular through hole 22 is formed at one end of each of the cranks 21 as shown in FIG. The inside of the through hole 22 of each of the cranks 21 and the arm bracket 19
As shown in FIG. 9A, a pin 23 is inserted into the through hole 20, and each crank 21 is rotatable around the pin 23.

As shown in FIG. 6B, a cutout 24 is formed in each crank 21 at the opposite end of the through-hole 22. As shown in FIGS. 6A and 6B, two circular through holes 25 are formed. Lock projections 26 are formed on both front and rear sides of each crank 21. Each of these lock projections 26 is located at the center in the longitudinal direction of the crank 21 and has a columnar shape.

As shown in FIG. 1, a recess 28 of a crank arm 27 corresponding to a leg-side arm is fitted on the outer peripheral surface of each connecting bar 17. Each of these crank arms 27
Is made of a synthetic resin containing a glass filler, and the length of each crank arm 27 is set to be larger than that of the crank 21. As shown in FIG. 4 located in the periphery of
Each cap nut 29 is insert-molded.

As shown in FIG. 1, a cover 30 is mounted on each crank arm 27. Each of these covers 3
Numeral 0 is formed of a synthetic resin containing a glass filler, and is detachably attached to the crank arm 27 based on tightening a screw (not shown) into each cap nut 29 through the cover 30. The lower surface of the recess 28 is closed. FIG. 8 shows the cover 30.

As shown in FIG. 7, each of the crank arms 27 is integrally formed with plate-like ribs 31 located on both front and rear sides, and each of the ribs 31 is formed with a circular through hole 32. ing. A lock groove 33 is formed in each rib 31 in the vicinity of the through hole 32, and a curved surface portion 34 is formed on the inner peripheral surface of each lock groove 33, which is inclined toward the concave portion 28 as it goes upward. Have been.

Each of the crank arms 27 has a structure shown in FIG.
As shown in the figure, a crank 21 is mounted. The crank arm 27 and the crank 21 of each set are rotatably connected based on inserting a pin 35 into the through hole 32 of the crank arm 27 and the through hole 22 of the crank 21. When the pair of legs 15 are folded, as shown in FIG. 3, each of the cranks 21 and each of the crank arms 27 are stored so as to face the top plate receiver 12 in the front-rear direction, and the lock projection 26 of each of the cranks 21 is connected to the crank arm. 27 escapes from the inside of the lock groove 33. In this state, each edge cover 18 comes into contact with the top plate receiver 12,
The rotation of the leg 15 due to its own weight is prevented by the contact pressure between the edge cover 18 and the top plate receiver 12.

As shown in FIG. 7, an operation plate 36 is formed integrally with each crank arm 27 so as to be located on the pin 35 side. Each of these operation plates 36 has both ribs 31.
Each of the operation plates 36
Has one end protruding from the end faces of both ribs 31. Each of these operation plates 36 has a concave adhesive surface 3.
7, and a seal 38 marked “PULL” is attached to each adhesive surface 37 as shown in FIG. 9. The operation plate 36 corresponds to an operation unit.

Next, the operation of the above configuration will be described. <Regarding the use of the table> In order to use the table, the legs 15 of each set are raised in the direction of arrow A in FIG. Then
Since each crank arm 27 moves with respect to the crank 21 together with the leg 15, the lock projection 26 of each crank 21 approaches the lock groove 33 of the crank arm 27. Thereafter, when the legs 15 of each set approach a standing state perpendicular to the top plate 11, the lock projections 26 of the respective cranks 21 are fitted into the entrances of the lock grooves 33 of the crank arm 27 as shown in FIG. Combine.

When each pair of legs 15 reaches the upright state, FIG.
As shown in (1), the lock projection 26 of each crank 21 reaches the deepest position in the lock groove 33 of the crank arm 27 so that the engagement state is reached. Each of the cranks 21 is housed between the two ribs 31 of the crank arm 27,
And the crank arm 27 is in a linear state.

In this state, when an external force in the direction of arrow A (opening direction) acts on each pair of legs 15, the connecting bar 17
An attempt is made to rotate along the rotation trajectory R1 about the shaft 16 of the fifth. Then, since each crank arm 27 attempts to move along the rotation locus R2 around the pin 23 of the crank 21, the crank 21 and the crank arm 27 are held in a straight line, and the legs 15 of each set Fall is prevented.

When an external force in the direction opposite to arrow A (closing direction) acts on each pair of legs 15, each of the crank arms 27
Is about to rotate about the pin 35 in the direction of arrow B. However, since the lock projection 26 of each crank 21 is engaged in the lock groove 33 of the crank arm 27, the crank 21 and the crank arm 27 are held in a straight line, and the legs 15 of each pair Fall is prevented.

<Regarding the storage of the table> To store the table, the operator puts his hand on the operation plate 36 of each crank arm 27 (see FIG. 9B) and pulls it in the direction of arrow C. Then, each crank arm 27 rotates about the pin 35, and the lock projection 26 of each crank 21 escapes from the inside of the lock groove 33 of the crank arm 27. In this state, since each set of legs 15 is allowed to rotate in the direction opposite to arrow A, the legs 15 of each set are folded based on the operation of turning each leg 15 in the direction opposite to arrow A.

According to the above embodiment, when the leg 15 is turned to the upright state, the crank 21 and the crank arm 2
7 are arranged in a straight line, and the lock projection 26 of the crank 21 is engaged with the lock groove 33 of the crank arm 27. For this reason, when an external force in the direction of arrow A is applied to the leg 15, the crank 21 and the crank arm 27 are held in a linear state, so that the leg 15 is prevented from opening in the direction of arrow A. Moreover, when an external force in the direction indicated by the arrow A acts on the leg 15, the crank 21 and the crank arm 27 are held in a linear state by the engaging force between the lock projection 16 and the lock groove 33, so that the leg 15 is prevented from closing. Thus, the leg 15 is prevented from falling down as a whole.

Further, since the length of the crank 21 is set shorter than that of the crank arm 27, when the leg 15 is rotated in the upright state, the moving distance of the lock projection 26 about the pin 35 is short. . For this reason, since the variation in the movement locus of the lock projection 26 is reduced, an engagement error between the lock projection 26 and the lock groove 33 is less likely to occur.
Increases reliability. In addition, since the shape of the lock groove 33 can be easily determined according to the movement locus of the lock projection 26, the design of the lock groove 33 is simplified.

An operation plate 36 is provided on the crank arm 27. Accordingly, the crank arm 27 rotates with respect to the crank 21 by one-touch operation of the operation plate 36, and the engagement between the lock projection 26 and the lock groove 33 is released, so that the folding operation of the leg 15 is simplified. .

Further, since the lock projection 26 is made to enter the entrance of the lock groove 33 immediately before the leg 15 is turned upright, the operation of the leg 15 is weighted just before the leg 15 is turned upright. it can. For this reason, the subsequent operation of the leg 15 is performed against the weight, so that the operator can feel the response of operating the leg 15 in the standing state, and
Operation feeling is increased.

In the above embodiment, the crank 21
The lock projection 26 is formed on the crank arm 27 and the lock groove 33 is formed on the crank arm 27. However, the invention is not limited to this. For example, the lock groove 33 is formed on the crank 21 and the lock projection 26 is formed on the crank arm 27. It may be formed. In the above-described embodiment, the length of the crank 21 is set shorter than the length of the crank arm 27. However, the length is not limited to this, and for example, the length of the crank 21 is The length may be set to be longer than the length, or the length of the crank 21 and the length of the crank arm 27 may be set to be the same.

In the above embodiment, the crank 2
Although 1 is rotatably supported by the two arm brackets 19, the invention is not limited to this. For example, it may be rotatably supported by one arm bracket. Further, in the above embodiment, the lock projection 26 is arranged at the center in the longitudinal direction of the crank 21. However, the present invention is not limited to this. May be. In particular, when the lock protrusion 26 is eccentric to the pin 35 side, the movement distance of the lock protrusion 26 is further shortened, so that the movement locus of the lock protrusion 26 is further reduced, and the lock protrusion 26 and the lock groove 3 are moved.
Mis-engagement with 3 becomes more difficult to occur. Further, in the above embodiment, the present invention is applied to a sitting table. However, the present invention is not limited to this. For example, the present invention may be applied to a standing desk which requires a combination of chairs.

[0030]

According to the desk of the present invention, when the legs are turned to the upright state, the top plate side arm and the leg side arm are aligned in a straight line, and the lock projection is engaged with the lock groove. Configured. For this reason, the top plate-side arm and the leg-side arm are held in a linear state regardless of whether the external force in the opening direction or the external force in the closing direction acts on the leg, and the leg is prevented from falling down.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of the present invention (a front view showing a main part of a sitting table in a standing state of legs).

FIG. 2 is a view showing a state immediately before a leg is raised in an upright state;
Equivalent figure

FIG. 3 is a view corresponding to FIG. 1 showing a state in which the legs are folded down in a folded state;

FIG. 4 is a view showing the appearance of a sitting table (a is a front view, and b is an arrow X).
b view, c is an arrow Xc view showing the legs in a folded state)

FIG. 5 is a view showing an arm bracket (a is a front view, b is a view from arrow Xb, and c is a view from arrow Xc).

FIG. 6 shows a crank (a is a front view, b is an arrow Xb
View)

FIG. 7 is a view showing a crank arm (a is a front view, b is a view from arrow Xb, and c is a view from arrow Xc).

FIG. 8 is a view showing a cover (a is a front view, b is a view from arrow Xb, and c is a view from arrow Xc).

9A is a perspective view showing a state immediately before the leg is raised, and FIG. 9B is a perspective view showing a state where the leg is raised.

FIG. 10 shows a conventional example.

[Explanation of symbols]

11 is a top plate, 15 is a leg, 21 is a crank (top arm), 26 is a lock projection, 27 is a crank arm (leg arm), 33 is a lock groove, and 36 is an operation plate (operation section). .

Claims (4)

[Claims] 1. A leg rotatably connected to a top plate, a top arm rotatably connected to the top plate, and a rotatable connection to both the leg and the top arm. A leg-side arm that is connected to be linear with respect to the top-plate-side arm when the leg stands up; a lock groove provided in one of the top-plate-side arm and the leg-side arm; A desk provided on the other of the side arm and the leg-side arm, the lock protrusion engaging with the lock groove based on the rotation operation of the leg in an upright state. . 2. The desk according to claim 1, wherein the top plate side arm has a shorter length than the leg side arm. 3. An operation unit for releasing the locking between the lock projection and the lock groove based on a rotational operation of the top plate side arm or the leg side arm, provided on the top plate side arm or the leg side arm. The desk according to claim 1, wherein the desk is provided. 4. The lock projection intrudes into the entrance of the lock groove immediately before the leg pivots upright and engages with the back of the lock groove when the leg pivots upright. The desk according to any one of claims 1 to 3, wherein