JPH0721136Y2 - Armchair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention In the present invention, the bottom end surface of the leg is provided with means for horizontal movement and rotation so that both horizontal movement and rotation can be freely performed on the floor surface. The armchair that can do.

2. Description of the Related Art Usually, an armchair has four legs fixed to the lower surface of the seat, and the bottom end surfaces of the legs are all formed to come into contact with the same plane. Therefore, the armchair can be stably placed on the floor. There are advantages. In addition, since a required number of legs can be extended to serve also as a member constituting a back handle (back) or a backrest, there is an advantage that the entire structure is simple and the manufacturing is simple.

On the other hand, in a normal office swivel chair, a rotating shaft made of a metal material is fixed to the center of the lower surface of the seat, and a bearing for holding the rotating shaft has a cross shape or the center of a leg portion composed of five radial bars. It has a structure in which a normal caster, which is a free wheel, is mounted near each of the tip ends of the casters. Since all the wheels of the casters are arranged so as to be in contact with the ground on the same plane, the office swivel chair can be stably and freely moved in the horizontal direction such as front, rear, left, and right while sitting on the floor. However, it has the advantage that it can independently rotate in either the left or right direction.

Problems to be Solved by the Invention On the other hand, in the former armchair, friction occurs between the bottom end surfaces of the four legs and the floor surface. Therefore, for example, when trying to bring the entire chair closer to the table, There has been a problem that a person who sits on the chair needs to manipulate the chair by leaning over it or pushing the chair from the assistant or from behind.

In addition, in the latter office swivel chair, in addition to a rotating mechanism portion consisting of a pair of rotating shafts and bearings, a plurality of crosspieces to legs and fasteners for attaching each are indispensable. There was a problem. In addition, there is a problem that the weight and the manufacturing cost are increased because it is necessary to use a member for maintaining a sufficient strength against a load received through the seat by one set of rotating mechanism parts. In addition, there is a problem in that it takes time and labor for work such as assembling to attach them. Further, a group of 4 to 5 casters arranged so as to be grounded on the same plane is, for example, one on one convex floor when used on an uneven floor surface.
If one caster gets on, the other two or three casters may float up from the floor and become unstable without touching the ground.

Therefore, the present invention uses a relatively simple member such as an ordinary caster or a fulcrum that is a free wheel on the leg of an armchair having a simple structure, and thus has a complicated structure such as a rotating mechanism in an office swivel chair. It is an object of the present invention to allow the entire chair to freely move horizontally and easily rotate without using any means.

Means for Solving the Problems In order to achieve the above object, the armchair of the present invention has rear legs near the rear edge on the center line facing the front-rear direction on the lower surface of the seat having armrests and having rigidity. Further, the three legs are fixed to the rear legs at a distance, and casters are attached to the lower end faces of the three legs, respectively, and the lower leg faces of the rear legs are centered around the axis of the rear legs. A rotatable fulcrum board is provided, and the lower surface of the fulcrum board is formed slightly higher than the lower surfaces of the casters.

In some cases, the front half and the rear half of the above configuration are reversed, and a plurality of legs are provided toward the rear, and a fulcrum board is attached to the lower end faces of the front legs and casters are attached to the lower end faces of the three legs.

Action When the weight of the seated person is leaning toward the side opposite to the leg on which the fulcrum board is attached, rather than the center of the seat, the wheels of the casters arranged on the three legs come into contact with the seated person. By operating the legs of the armchair, the armchair can be horizontally moved in the front, rear, left and right directions.

Also, when the weight of the seated person is leaned closer to the leg with the fulcrum board attached than to the center of the seat, the fulcrum board contacts the ground contact surface of the casters of the two legs as the fulcrum, so the armchair As the horizontal movement is braked, both casters placed on each of the legs move using the fulcrum board as a fulcrum due to the movement of the seated person's waist and legs or the operation of the hand, and the armchair has a circular arc seat. You will be able to rotate as you draw.

First Embodiment A first embodiment of the present invention will be described below with reference to FIGS.

The seat 1 is a molded plywood that has rigidity that does not easily bend in the front-back direction due to the movement of the weight of the seated person.
It is formed in either an oval shape or a rhombus shape.
In the case of an ellipse, the minor axis is arranged in the front and rear, and the major axis is arranged in the left and right.

On the center line of the lower surface of the seat 1 facing the front-rear direction, the rear leg 2 is fixed near the rear edge, and the front leg 3 is fixed near the front edge. Also, 30 to 50 mm from the center line that faces to the left and right
The left leg 4 and the right leg 5 are fixed near the left and right edges, respectively, which are rearward. The three legs including the front leg 3, the left leg 4, and the right leg 5 are spaced apart from the rear leg 2. Furthermore, the three legs 3, 4 and 5 can either be embedded with the caster insertion portion 10 on the bottom end face thereof, and have a thickness sufficient to withstand the load, and can be made of either a wood / metal pipe or a synthetic resin. Composed of materials. Front leg 3
Is the height to the bottom of the seat 1, but the rear leg 2 and the left leg 4
In addition, the right leg 5 has a seat support portion 6 formed by cutting out so as to bite the edge of the seat 1 at an appropriate height.
Further, the back handle 7 is formed by projecting upward from the seat 1 toward the seat 1. In addition, a head tree 8 is installed on the top of the spine 7.

The tree 8 is curved in a substantially arcuate shape so that the front is concave, and the backrest is in the vicinity of its center, and either wood or metal pipe or synthetic resin is used as the main material so that the left and right ends are armrests. Has been done.

As the caster, an ordinary caster having a caster insertion portion 10 having a core rod for insertion is provided on the upper portion thereof and having a free wheel. And three casters 9a, 9b, for convenience
9c inserts the front, left, and right legs 3, 4, through the caster insertion part 10.
One is attached to the lower end surface of each one.

On the other hand, the lower end surface of the rear leg 2 is a fulcrum plate made of a disk with a diameter of about 30 mm so that friction occurs when the bottom surface of the rear leg 2 comes in contact with the ground.
11 is installed. On the upper part of the fulcrum board 11, the rear legs 2
Is provided with a fulcrum rotation shaft portion 13 along the axis of
The fulcrum board insertion portion 12 engaged with the lower end portion of the rear leg 2 is connected to the upper part of the rear leg 2, and the rear leg 2 rotates about its axis with respect to the fulcrum rotation shaft portion 13 provided with the fulcrum board 11. You can move. And the length from the lower surface of the seat 1 to the lower surface of the fulcrum board 11 is determined from the length from the lower surface of the seat 1 to the lower surface of each of the casters 9a, 9b, 9c of the other three legs 3, 4 and 3. The fulcrum board 11 is formed so that the height gap 14 is formed between the lower surface of the fulcrum board 11 and the floor surface so that the lower surface of the fulcrum board 11 is slightly higher.

In addition, the following will be described a second embodiment of the present invention with reference to the 3-4 Figure, wherein the first bottom end surface of the embodiment similarly to forming the front leg 3 _2, to produce a height gap 14 ₂ fulcrum plate 11 ₂ forms it is rotatably mounted via a fulcrum pivot shaft portion 13 _2.

And the bottom end surface of the rear leg 2 _2, left leg 4 ₂ and both caster 9b in the right leg 5 _{2 2,} 9c ₂ similar caster 9a ₂ is provided. Also, each of the left leg 4 ₂ and the right leg 5 ₂ is seated 1 ₂
It is bitten by the seat 1 ₂ through the seat support portion 6 ₂ near the left and right edges on the front side about 30 to 50 mm from the center line in the front-back direction. As described above, the second embodiment has the same configuration as that of the first embodiment except the points described above.

Effect of the Invention Since the present invention has the above-mentioned configuration, since no load is applied to the fulcrum board, when the load is applied so that the height gap generated below the fulcrum is maintained, the horizontal movement is performed by the three casters. It can be freely set.

Even when the person sitting on the armchair is not loaded, that is, even when the armchair is in a stand-alone state, its weight is light because it has a relatively simple structure, and when the armchair is moved by applying external force. Has the effect of reducing its labor.

Further, when a load is applied so that the fulcrum board comes into contact with the ground, the fulcrum board stops on the floor surface due to the frictional effect and brakes the horizontal movement of the armchair, and furthermore, the fulcrum board is attached to the fulcrum board. The legs rotate around their axes, and the two casters inserted into the two legs move with the fulcrum board as a fulcrum, whereby the armchair can be easily rotated.

Also, when the armchair is used near the edge of the deck of a desk, the points near the front edge of the seat and the joints of both knees of the sitting person are close to the fulcrum board. Since the locus drawn by the rotation of the chair is smaller when the distance between the desk position and the fulcrum panel is smaller in the comparison in which the position of the chair close to the desk is the same. When sitting and standing only by turning without moving backward, the second embodiment in which the fulcrum board is attached to the lower end surface of the front leg makes the radius of action of both legs of the person smaller, that is, the chair. This has the effect of reducing the operational burden on the user.

[Brief description of drawings]

FIG. 1 is a perspective view of a first embodiment of an armchair according to the present invention,
2 is a side view thereof, FIG. 3 is a perspective view of the second embodiment thereof, and FIG. 4 is a side view thereof. 1,1 ₂ …… Seat, 2,2 ₂ …… Rear leg, 3,3 ₂ …… Front leg 4,4 ₂ …… Left leg, 5,5 ₂ …… Right leg, 6,6 ₂ …… Seat support Part 7 ... Stalk, 8 ... Kasaki 9a, 9b, 9c, 9a ₂ , 9b ₂ , 9c ₂ ...... Caster 10 …… Caster insertion part, 11,11 ₂ …… Support point board 12 …… Support point board insertion Fitting part, 13,13 ₂ …… Supporting shaft part 14,14 ₂ …… Height gap

Claims (2)

[Scope of utility model registration request] 1. A lower leg of a seat having an armrest and having rigidity, a rear leg is fixed near a rear edge on a center line facing the front-rear direction, and further, three legs are fixed at a distance from the rear leg. , Casters are attached to the lower end surfaces of the three legs, respectively, and a fulcrum plate that is rotatable about the axis of the rear leg is provided on the lower end surfaces of the rear legs. An armchair characterized by being slightly higher than the underside of the armchair. 2. A front leg is fixed near a front edge on a center line facing the front-rear direction on a lower surface of a seat having an armrest and having rigidity, and three legs are fixed at a distance from the front leg. Casters are attached to the lower end faces of the three legs, respectively, and a fulcrum plate rotatable about the axis of the front leg is provided on the lower end face of the front leg. The lower surface of the fulcrum plate is slightly smaller than the lower surface of each caster. An armchair characterized by a high price.