JP3803642B2 - Retractable chair - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a retractable chair provided in a lecture room or a conference hall such as a school where a backrest is tilted forward when not in use.
[0002]
[Prior art]
Chairs used in lecture halls are arranged in parallel, and a person can pass by storing the chairs.
The applicant has developed a retractable chair that separates the seat and the backrest and can be stored compactly when not in use (Patent Document 1).
[0003]
As shown in FIG. 8, this is because the backrest support portion 21 fixed to the backrest is fixed to the fixed portion 20 provided on the floor so as to be pivotable in the front-rear direction, and the upper end is connected to the front portion of the seat receiver 22. The link 25 is connected to the rotating portion at the lower end of the backrest support portion 21, and the rear portion of the seat receiver 22 and the center portion of the backrest support portion 21 are connected by the auxiliary link 23.
[0004]
According to this, when the backrest support part is rotated backward, the seat becomes almost horizontal and can be seated, and when it is rotated forward, the seat is folded in a substantially vertical state and the person behind the backrest is folded. It is designed to form a space that can pass through.
As another type of the prior art, as shown in FIG. 9, a seating portion 30 in which a seat and a backrest are integrated is mounted on a support block 27 fixed to the floor, and a front leg 28 and a rear leg 29 are used in the front-rear direction. Some are supported so as to be swingable (for example, Patent Document 2).
[0005]
[Patent Document 1]
Japanese Patent No. 2927712.
[Patent Document 2]
JP 2002-28043 A.
[0006]
[Problems to be solved by the invention]
The retractable chair of Patent Literature 1 is stored compactly when not in use, and the front end side of the seat is inclined downward, so that it is easy to sit or leave. However, if a person passes behind the chair while seated, as shown in Fig. 8, the seated person stands up with his hands so that he can stand up and lift his hips slightly. Must be tilted.
[0007]
On the other hand, the retractable chair of Patent Document 2 can be moved forward without lifting the waist as in Patent Document 1. However, this move is not easy. That is, as shown in FIG. 9, the leg that is tilted backward is rotated to the vertical side during use, and the seat is moved so as to be lifted, so that it is difficult to move. This retractable chair is simple because the seat and the backrest are integrated, but there is a drawback that the front end of the seat does not easily hit the back of the knee when standing up or down on the seat.
[0008]
Accordingly, an object of the present invention is to provide a retractable chair that can be easily taken off and seated and is compactly stored when not in use, and can smoothly move forward when a person passes behind while sitting.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention adopts the following means. That is, as described in claim 1,
One end of the seat that extends in the front-rear direction is attached to the upper surface of the seat receiver and two lower mounting positions spaced apart in the front-rear direction of the lower surface of the seat receiver. Columnar front legs and rear legs that are movably attached, biasing means attached to one end side of the rear legs and biasing in the direction of raising the seat, and installed on the floor, spaced in the front-rear direction A leg seat in which the other end of each of the front leg and the rear leg is rotatably attached to each of the two attachment positions with a gap between them, and a direction attached to the rear leg along the direction in which the rear leg extends. A backrest having an inclined surface, wherein the front leg and the rear leg are swung forward and the rear of the seat is raised, and the front leg and the rear leg are lifted from the stowed state. Each of the rear legs is swung backward, and the rear of the seat is lowered to a surface along the floor surface so that the seat can be seated on the seat. It is a feature .
[0010]
The front and rear legs need not be parallel. It is convenient to restrict the swing range by contacting a stopper provided on the leg seat during storage and use.
In addition, in order to connect the upper ends of the front legs and the rear legs to the seat support so that the chair can be easily moved forward when a person passes behind while sitting, the state when the chair is in use is claimed. As described in 2 , it is desirable that the straight line connecting the connection point between the seat receiver and the leg seat on the front leg is perpendicular or forwardly inclined with respect to the horizontal plane. In addition, it is desirable that the straight line connecting the seat receiver on the rear leg and the connecting point with each of the leg seats is not so inclined to the vertical line.
[0011]
In addition to being compact when stored, it is necessary to take care not to impair the aesthetics of the chair in use and storage, and the inclination of the rear legs should be almost the same as the inclination of the backrest. Is desirable.
In the present invention, as described in claim 3 , the other end of the rear leg is attached to the leg seat via an attachment portion extending rearward from the lower end of the leg in the rear leg from the center line of the leg. It has a feature. Therefore, the front legs and rear legs in use are easy to rotate forward, and the front part of the seat acts to tilt slightly forward, and there is no feeling of raising the seat, so it moves very smoothly.
[0012]
Note that the lower end of the front leg does not necessarily have to be in front of the rear leg. For example, as described in claim 4 , the front leg has a connection position between the lower end and the leg seat and the lower leg of the rear leg is connected to the leg seat. It may be located above the position.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 3 is a perspective view showing an overall appearance when the retractable chair according to the embodiment is used, FIG. 1 is a side view, and FIG. 4 is an exploded perspective view.
[0014]
As shown in each of the above figures, this stowable chair has a seat receiver 2 having a seat 1 fixed on the upper surface, and is connected to a leg seat 10 fixed on the floor with bolts or the like by a front leg 3 and a rear leg 4. ing. An inverted U-shaped back column 8 having a backrest 9 fixed thereto is fixed to the rear leg 4.
[0015]
The upper end of the front leg 3 is pivotally attached to the front side of the seat receiver 2 by a horizontal shaft 3a, and the lower end is pivotally attached to the leg seat 10 by a horizontal shaft 3b. It is attached in a slightly forward tilted state.
The rear leg 4 is slidably mounted on a cylindrical leg body with a support cylinder 5 extending upward, and an attachment member 7 is fixed to the lower end. A gas spring 6 is provided as an urging means having an upper end attached to the support cylinder 5 with a pin 6b and a lower end attached to the leg with a pin 6a.
[0016]
The upper end of the rear leg 4, that is, the upper end of the support cylinder 5 is pivotally attached to the rear part of the seat receiver 2 by a horizontal shaft 5 a, and the lower end of the rear leg 4, that is, the attachment member 7 is horizontal to the leg seat 10. It is rotatably attached by a oscillating shaft 7a.
The swinging shaft 7a is positioned considerably rearward from the axis of the rear leg 4 (the center line of the leg body and the support cylinder 5), and swings between the shaft 5a connecting the upper end of the rear leg 4 and the lower end. The straight line connecting the axes 7a is close to a vertical line.
[0017]
That is, the rear leg 4 has substantially the same inclination as the backrest 9, and the straight line connecting the shaft 5a and the rocking shaft 7a is inclined backward at a small angle with respect to a vertical line when in use.
As shown in detail in FIG. 2, the leg seat 10 is attached to the floor with bolts, and stores the lower part of the front leg 3 and the lower part of the rear leg 4 to regulate the front-rear direction when the chair is used and stored.
[0018]
That is, a receiving member 12 with which a lower end abuts when the front leg 3 tilts forward is fixed to the front of the leg seat 10, and a rear abutting member 7 c of the mounting member 7 of the rear leg 4 is fixed to the rear. The stopper 11 with which is in contact is fixed.
In addition, 13 is rubber | gum, 14 is a baseplate, 10a is a cover, 15 is an attachment hole.
[0019]
Next, the operation of the retractable chair configured as described above will be described.
When the retractable chair is not used, as shown in FIG. 5 (a), the backrest 9 is tilted forward and stored as a whole tilted forward. In this state, the support cylinder 5 of the rear leg 4 is lifted by being biased by the gas spring 6, the seat receiver 2 is rotated about the shaft 3 a at the upper end of the front leg 3, and the stopper 2 a of the seat receiver 2 is attached to the front leg 3. It is in contact with the upper front end. Note that the biasing force of the gas spring 6 is also in a state of biasing the seat receiver 2 even in this state, and the seat receiver 2 is in an inclined state in which the rear portion is greatly raised and is folded compactly.
[0020]
As shown in FIG. 6A, the lower ends of the front leg 3 and the rear leg 4 at this time are in contact with the receiving member 12, and the lower end portion 7b of the mounting member 7 of the rear leg 4 is in contact with the bottom plate 14. ing.
When sitting on a retractable chair, first, as shown in FIG. 5 (b), the backrest 9 is tilted backward. As a result, the front leg 3 tilts backward with the lower shaft 3b as a fulcrum, and the lower end is separated from the receiving member 12 as shown in FIG. Further, the rear leg 4 tilts rearward with the swing shaft 7 a as a fulcrum, the lower end portion is separated from the bottom plate 14, and the rear end contact member 7 c contacts the stopper 11 of the leg seat 10.
[0021]
In this state, the seat 1 is tilted forward and is easy to put in because the space with the desk is wide.
When seated, as shown in FIG. 5C, the support tube 5 of the rear leg 4 is reduced, and the seat 1 is almost flat. The lower end portions of the front leg 3 and the rear leg 4 at this time are the same as the state of FIG. 6B in which the abutting member 7c at the rear end is in contact with the stopper 11 of the leg seat 10 as shown in FIG. However, the front leg 3 is positioned in a substantially vertical state by being seated.
[0022]
When a person passes behind when sitting, as shown in FIG. 5D, the seat 1 is moved forward while the seated person is seated.
The seat 1 can be moved smoothly because the front leg 3 is in the forward tilt direction and the rear leg 4 is also rotated in the vertical state with a slight forward tilt. And as shown in FIG.6 (c), if the lower end of the front leg 3 latches to the receiving member 12, it will stop. Therefore, a seated person is not caught between the desks.
[0023]
After the person passes, if the seated person moves the seat 1 backward, the state shown in FIG. 5C can be restored. That is, a person can pass behind without taking a lame posture such as a person who is seated stands or floats. Further, when leaving the seat from the seated state, if the hip is lifted from the state of FIG. 5 (c), the rear leg 4 extends upward and becomes the state of FIG. 5 (b). Therefore, it is possible to easily leave the seat.
[0024]
In the above-described embodiment, the front leg 3 is described as being positioned at the front portion of the leg seat 10, but the attachment position of the lower end of the front leg 3 does not necessarily have to be in front of the rear leg 4. For example, as shown in FIGS. 7A and 7B, the shaft 3 b at the lower end of the front leg 3 may be provided above the swing shaft 7 a at the lower end of the rear leg 4. FIG.7 (b) shows the case where it installs on the inclined floor surface or a step-like floor surface. However, in the case of FIG. 7, since the front leg 3 and the rear leg 4 intersect when stored, for example, two front legs 3 are provided at intervals and one rear leg 4 is provided between them so as not to interfere. To.
[0025]
【The invention's effect】
As described above, the retractable chair of the present invention has a front leg connected to a substantially vertical or forward tilted state when used, a backrest fixed to the back leg and a biasing means for raising the seat when not in use, In addition, the connecting position with the leg seat is located rearward from the axial direction of the rear leg, so it is easy to sit and leave, compactly stored when not in use, and when a person passes behind when seated, However, the seat can be moved forward easily.
[Brief description of the drawings]
FIG. 1 is a side view showing the whole of a stowable chair according to an embodiment of the present invention in use.
FIG. 2 is a cross-sectional view showing details of a leg seat 10 of FIG.
FIG. 3 is a perspective view of the retractable chair.
FIG. 4 is an exploded perspective view of the same.
FIGS. 5A and 5B are views showing the state of the retractable chair, wherein FIG. 5A is a storage state when not in use, FIG. 5B is a state where the backrest is tilted backward for use, and FIG. d) A state in which the seat is moved forward so that a person passes behind the chair.
6 is a view showing the state of the front legs 3 and the rear legs 4 corresponding to FIG. 5, wherein (a) is a storage state when not in use, and (b) is a state in which the backrest is tilted backward and seated use. A state, (c) a state in which the seat is moved forward because a person passes behind the chair.
FIG. 7 is a side view showing a skeleton of a front leg and a rear leg of a retractable chair showing another embodiment.
FIG. 8 is an explanatory view showing an operating state of a conventional retractable chair.
FIG. 9 is an explanatory view showing an operating state of another conventional example.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Seat 2 ... Seat receiver 2a ... Stopper 3 ... Front leg 3a, 3b ... Shaft 4 ... Rear leg 5 ... Supporting cylinder 5a ... Shaft 5b ... Sliding member 6 ... Gas spring 6a, 6b ... Pin 7 ... Mounting member 7a ... Swing Moving shaft 7b ... Lower end 7c ... Contact member 8 ... Back column 9 ... Backrest 10 ... Leg seat 10a ... Cover 11 ... Stopper 11a ... Contact surface 12 ... Receiving member 13 ... Rubber 14 ... Bottom plate 15 ... Mounting hole 20 ... Fixed Part 21 ... Back support part 22 ... Seat receiver 23 ... Auxiliary link 25 ... Main link 27 ... Support block 28 ... Front leg 29 ... Rear leg 30 ... Seating part

Claims (4)

A seat receiver with a seat extending in the front-rear direction attached to the upper surface;
Columnar front legs and rear legs, one end of which is rotatably attached to the seat receiver at each of two attachment positions spaced apart in the front-rear direction in the lower surface side region of the seat receiver,
An urging means attached to one end of the rear leg and urging the seat in the direction of raising the seat;
A leg seat that is installed on the floor and is attached to each of two attachment positions spaced apart in the front-rear direction so that the other end of each of the front legs and the rear legs is rotatably attached;
A backrest attached to the rear leg and having an inclined surface along a direction in which the rear leg extends;
The front leg and the rear leg are swung forward and the seat is raised by raising the back of the seat, and the front leg and the rear leg are swung backward from the stowed state. A stowable chair configured to be in a usable state in which a user can sit on the seat by lowering the rear of the seat to a surface along the floor surface. The front legs are attached in such a positional relationship that, when the retractable chair is in use, a straight line connecting the connection points of the seat receiver and the leg seats is either perpendicular or forward inclined with respect to a horizontal plane. The retractable chair according to claim 1 , wherein: The other end of the rear leg according to claim 1, characterized in that attached to the leg seat via an attachment portion extending rearward from the center line of the leg from the lower end of the leg in the rear leg or The retractable chair according to claim 2 . Said front legs, the consolidated position between the leg seat and the lower end thereof, according to claim 1 to 3 or, characterized in that located above the connecting position between the leg seat at the lower end of the rear leg Storage chairs.

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