JP2002282077A - Chair - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a chair in which an auxiliary leg can be easily and reliably held in a use position and a storage position and malfunction of the auxiliary leg can be prevented. SOLUTION: In this chair in which a backrest 3 can be raised into a raised state and laid into a nearly horizontal state, and an auxiliary leg 6 which becomes a leg when the backrest 3 is put into a horizontal state is mounted in the upper portion of the rear of the backrest 3 so that it may be rotated into the use position nearly perpendicular to the rear of the backrest 3 and the storage position following the rear side, and an engagement means (stopper) 13 capable of engaging the auxiliary leg 6 in the use position and the storage position is provided in the rear side of the backrest 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chair in which a backrest can be raised and lowered between an upright state and a substantially horizontal state.
In particular, the present invention relates to a chair that can prevent a malfunction of an auxiliary leg supporting a rear end portion when a backrest is in a horizontal state.

[0002]

2. Description of the Related Art Heretofore, this kind of chair is known as a so-called bed chair, and is widely used for attending and nursing at hospitals and the like. Such chairs often have auxiliary legs pivotally mounted on the upper back of the backrest. In general, these chairs, when switching the backrest from a standing state to a horizontal state, lift this auxiliary leg,
A structure is employed in which a wire interlocking with the release releases the reclining mechanism so that the backrest can fall down.

[0003]

However, in this structure, when the backrest is in the upright state, if the auxiliary leg is lifted by mistake, the backrest may fall down unexpectedly. Also, if the auxiliary leg is accidentally kicked in a horizontal state, the auxiliary leg may be folded and the entire chair may fall.
However, heretofore, there has been no simple and effective method that can solve the above-mentioned problems.

The present invention has been made in view of the above-mentioned problems of the prior art, and has been made so as to be able to easily and surely hold an auxiliary leg between a use position and a storage position, thereby preventing a malfunction of the auxiliary leg. It is intended to provide.

[0005]

According to the present invention, the above-mentioned problems are solved as follows. (1) The backrest can be turned upright and almost horizontally,
And, on the upper part of the back of the backrest, the auxiliary leg which is a leg when the backrest is in a horizontal state, is rotatable between a use position substantially perpendicular to the back of the backrest and a storage position along the back. In the mounted chair, a locking means capable of locking the auxiliary leg between the use position and the storage position is provided on the back surface of the backrest.

(2) In the above item (1), the locking means is
The auxiliary leg is attached to the back of the backrest so as to be movable in the vertical direction, and is engaged with and disengaged from a part of the auxiliary leg in the use position, so that the auxiliary leg can be locked in the use position or released. A first engagement portion, and a second engagement portion capable of engaging and disengaging the other portion of the auxiliary leg at the storage position to lock the auxiliary leg at the storage position or release the locked state. And a stopper having

(3) In the above item (2), the stopper is
The backrest is sandwiched from the front and rear by a middle portion of a pressing plate that is fixed to the back and has both ends fixed to both ends in the left-right direction, so that the backrest can slide vertically.

(4) In the above item (3), a bent piece for retaining is provided at the lower end of the stopper so as to face backward.

(5) In any one of the above items (2) to (4), the auxiliary leg is pivotally attached to the backrest with a left-right pivot, and a bent piece facing rearward is provided at the upper end. Left and right 1
A pair of leg rods and a connecting rod pointing in the left-right direction connecting the rear ends of the bent pieces of both leg rods are formed, and the first engagement portion is formed by folding the upper end of the stopper backward. And a substantially U-shaped folded portion in a side view that fits over the connecting rod of the auxiliary leg when in the use position, and the second engaging portion is continuously suspended from the free end of the folded portion. ,
In addition, it is a hanging piece that contacts the edge of the auxiliary leg on the backrest side of the auxiliary leg when in the storage position.

(6) In any one of the above items (2) to (5), the stopper is provided with a hole for hooking.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a chair according to the present invention will be described with reference to the drawings.

As shown in FIG. 1, in this chair, a rectangular seat (2) in plan view is provided between the upper ends of a pair of left and right side legs (1), and behind the seat (2), A backrest (3) is provided by a reclining mechanism (not shown) provided between both legs (1) so that the backrest can be turned up and down between a standing position shown by a solid line and a substantially horizontal position shown by an imaginary line. A footrest (4) is provided below the seat (2) between the legs (1) so that it can be pulled out forward.

An upper portion of an auxiliary leg (6) is pivotally mounted on a pair of left and right brackets (5) protruding from an upper portion of the back of the backrest (3) with a screw shaft (7) facing left and right.

The auxiliary leg (6) has a bent piece facing rearward at the upper end.
A pair of left and right leg rods (8) with (8a) connected vertically
And a connecting rod 9 in the form of a flat plate extending in the left-right direction for connecting the rear ends of the bent pieces 8a of the two leg rods 8, as shown by solid lines in FIGS. 1, 2 and 5. Thus, the storage position along the back of the backrest (3) and the backrest when the backrest (3) is in a substantially horizontal position as shown by the imaginary line in FIG. 1 and the solid line in FIG.
In order to be a leg supporting the free end of (3), it can be rotated about the screw shaft (7) to a use position substantially perpendicular to the back of the backrest (3). The wire (not shown) is pulled while being turned from the storage position to the use position, and is linked to the reclining mechanism so that the locked state of the reclining mechanism is released.

At the center of the upper part of the back of the backrest (3), both sides of a flat fixing plate (10) and a left-right-direction pressing plate (11) whose central part is shallowly recessed rearward are formed. , Set screw (1
2) They are fastened together and fixed.

In a thin space formed between the fixed plate (10) and the holding plate (11), a base piece (a stopper) (13) as a locking means formed by bending a flat steel plate is formed. 14) are fitted so as to be slidable up and down with a required resistance.

The stopper (13) is formed by bending the above-mentioned base piece (14) facing in the vertical direction and the upper end of the base piece (14) backward and downward in a U-shape. Become folded part (15)
And a hanging piece (17) that continuously hangs from the rear lower end of the folded portion (15) via the step (16) and becomes a second engaging portion;
The base piece (14) is formed so as to be bent rearward from the lower end thereof, and includes a stopper piece (18) for preventing the stopper (13) from coming out upward.

The hanging piece (17) has an elongated hole (19) pointing in the left-right direction which is used as a handle for moving the stopper (13) in the up-down direction.
Is provided.

As shown in FIG. 3, the front-back distance (D1) inside the folded portion (15), which is the first engaging portion, is substantially the same as the plate thickness of the connecting rod (9) in the auxiliary leg (6). As shown in FIG. 4, the auxiliary leg (6) is brought into the use position by straddling the center of the connecting rod (9) of the auxiliary leg (6) in the use position from above from above. Can be restrained.

As shown in FIG. 3, the distance (D2) between the rear surface of the hanging piece (17), which is the second engaging portion, and the front surface of the base piece (14).
Is the connecting rod on the auxiliary leg (6) when in the storage position.
The distance between the front edge of the central portion of (9) and the rear surface of the fixing plate (10) is substantially the same as shown in FIG. By engaging with the front edge of the central portion of (9), the rotation of the auxiliary leg (6) in the direction of the use position can be prevented.

The rotation of the auxiliary leg (6) in the direction opposite to the direction of use in the storage position is prevented by the contact of the leg rods (8) with the back of the backrest (3). You.

Next, the operation procedure of this embodiment will be described. To lower the backrest (3) from the standing position to the horizontal position, first raise the stopper (13) upward, and
Remove (17) above the front edge of the connecting rod (9) in the auxiliary leg (6).

Next, the auxiliary leg (6) is rotated to the use position. At this time, the locked state of the reclining mechanism is released, and the backrest (3) can be tilted rearward.
While holding the backrest (3) almost in the upright position, the auxiliary leg (6)
Is turned to the use position, and then the stopper (13) is lowered, so that the folded-back portion (15) is the auxiliary leg in the use position.
(6) The auxiliary leg (6) fits over the center of the connecting rod (9)
After completely locking the backrest (3), the backrest (3) is lowered to a substantially horizontal position, and the lower ends of both leg rods (8) of the auxiliary leg (6) are preferably brought into contact with the floor.

The footrest (4) is provided with a seat if necessary.
(2) It is only necessary to put in and out from the bottom from the front.

To return the backrest (3) from the horizontal position to the upright position, the operation may be performed in the reverse order of the above.

The present invention is not limited to only the above-described embodiment, and various modifications are possible.

For example, by appropriately adjusting the dimensions of each part, the interval (D1) and the interval (D2) shown in FIG. 3 are the same (D1 = D2).
By eliminating the step (16), the hanging piece (17) may be continued from the folded part (15) as it is, or the lower part of the hanging piece (17) may be inclined toward the base piece (14). And the hanging piece (1
7) can easily enter the front of the connecting rod in the auxiliary leg (6) when the storage position is set.

[0028]

According to the present invention, the following effects can be obtained. (a) According to the first aspect of the present invention, the auxiliary leg can be locked to the back of the backrest in both the use position and the storage position, so that the auxiliary leg is erroneously operated due to mischief or malfunction of a child. When the backrest suddenly falls down from the standing position to the horizontal position, or when the backrest is used in the horizontal position, the auxiliary leg is kicked or another object collides, the storage position It is possible to prevent the chair from being folded to the side so that the balance of the whole chair is lost and the chair itself falls down.

(B) According to the second aspect of the invention, the locking when the auxiliary leg is in the use position with only a single stopper;
Since it can perform both of the locking at the storage position, the structure can be simplified and the operation can be simplified.

(C) According to the third aspect of the invention, the stopper can be easily supported.

(D) According to the invention of claim 4, it is possible to easily prevent the stopper from coming off upward.

(E) According to the fifth aspect of the present invention, the structures of the auxiliary leg and the stopper can be simplified and can be manufactured at low cost.

(F) According to the invention of claim 6, the operability of the stopper can be improved with a simple structure.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the upper portion of the backrest as viewed from the rear.

FIG. 3 is a side view of the stopper.

FIG. 4 is a rear perspective view showing a state where the auxiliary leg is locked at a use position by a stopper.

FIG. 5 is a rear perspective view showing a state where the auxiliary leg is set in a storage position and locked by a stopper.

[Explanation of symbols]

 (1) Side legs (2) Seat (3) Backrest (4) Footrest (5) Bracket (6) Auxiliary leg (7) Screw shaft (8) Leg rod (8a) Folding piece (9) Connecting rod (10 ) Fixing plate (11) Holding plate (12) Set screw (13) Stopper (locking means) (14) Base piece (15) Pushed back part (first engaging part) (16) Step part (17) Hanging piece (Second engaging part) (18) Retaining piece (19) Slot (hole for handling)

Claims (6)

[Claims] An auxiliary leg which can be turned up and down between an upright state and a substantially horizontal state, and which is a leg when the backrest is in a horizontal state, is provided on an upper part of the back of the backrest. In a chair that is rotatably mounted between a use position making a substantially right angle and a storage position along the back, locking means capable of locking an auxiliary leg between the use position and the storage position is provided on the back of the backrest. A chair characterized by being provided. 2. The method according to claim 1, wherein the locking means is attached to the back of the backrest so as to be movable in the vertical direction, and is engaged with and disengaged from a part of the auxiliary leg in the use position to lock the auxiliary leg in the use position. The first engaging portion capable of releasing or releasing the locked state is engaged with the other portion of the auxiliary leg when the storage position is set, and the auxiliary leg is locked in the storage position or the locked state is released. The chair according to claim 1, wherein the chair has a stopper having a second engaging portion that can be moved. 3. The stopper is slidable in the vertical direction with the stopper being sandwiched from the front and rear by a back surface of the backrest and an intermediate portion of a pressing plate having both ends fixed to the back surface and facing in the left-right direction. The described chair. 4. The chair according to claim 3, wherein a bent piece for retaining is provided at a lower end of the stopper so as to face backward. 5. A pair of left and right leg rods, each of which has an auxiliary leg pivotally attached to a backrest with a left-right pivot and a rearwardly bent portion at the upper end thereof, and a bent portion of both leg rods. And a connecting rod pointing in the left-right direction for connecting the rear ends thereof.
A substantially U-shaped folded portion which is formed by folding back the upper end portion of the stopper rearward and which is fitted over the connecting rod of the auxiliary leg when in the use position; 5. The engaging piece is a hanging piece that hangs continuously from the free end of the turn-back part and abuts on the backrest side edge of the connecting rod of the auxiliary leg when in the storage position.
Chair according to any of the above. 6. The chair according to claim 2, wherein a hole for a hand is provided in the stopper.