JPH0773555B2 - Elasticity adjustment device for seat in chair - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a structure of an elasticity adjusting device for a seat body with a backrest in an office or work chair.

[Conventional technology]

In the office or work chair, as a chair in which the degree of bending of the seat body can be changed in accordance with the weight of the seated person and the load when leaning on the backrest, the actual Kaihei 1-86838
Japanese Patent Publication No. 37-12526 and Japanese Utility Model Publication No. 38-10427 all have a backrest and a seat formed integrally from a synthetic resin plate. It was a seat body, and on the back surface of this seat body, the front part of the seating part and the upper and lower midway parts of the backrest part were interspersed and supported by the legs made of metal pipes. .

[Problems to be Solved by the Invention]

According to these configurations of the prior art, the seat body itself is integrally formed of a plate made of a synthetic resin that is easily elastically deformed as much as possible, but the engagement support position of the seat body by the leg does not move greatly. Since it is impossible, the curved shape of the seat body and the degree of rearward tilting of the backrest cannot be greatly changed according to the weight of the seated person, and the chair is insufficient as a so-called weight-sensitive chair.

Moreover, since the legs made of metal pipes are directly attached to the back of the seat body, the chair does not have a solid feeling or a luxurious feeling.

In view of the conventional drawbacks, the present invention intends to provide a chair with a profound feeling and a high class feeling, which enables the shape of the seat body and the cushion performance to be changed according to the weight of the seated person and the degree of the backrest. It is a thing.

[Means for Solving the Problems]

To achieve this object, the present invention integrally forms a seat body having a substantially L-shape in a side view, which is composed of a seating portion and a backrest portion, with an elastic plate, while an outer shell body fixed to a leg body. And an elastically deformable movable shell body disposed in the gap between the seat body and the back surface of the seat body are integrated so that the upper support piece and the lower support piece having a downward convex curved cross section form a bearing part at the connecting point in the middle. Of the upper and lower supporting pieces of the movable shell body are slidably abutted on the lower shell surface of the outer shell body, and the bearing portions of the movable shell body and the upper end surfaces of the upper supporting pieces are formed. Also, the seat body is slidably supported on the lower end surface of the lower support piece.

[Operation and effect of the invention]

In the present invention, both the seat body and the movable shell body are elastically deformable by an external force.

The movable shell body is formed by connecting two downward convex curved support pieces, an upper support piece and a lower support piece,
The connecting portion of the upper and lower support pieces serves as a support portion that projects in a direction opposite to the convex curve direction (a direction in which the back surface of the seat body contacts).

Therefore, the movable shell body is supported on the surface of the outer shell body at two points in the side view of the chair, such as the downward convex curved portions of the upper support piece and the lower support piece, while the outer shell body is supported. The position where the back surface of the seat body is supported by the movable shell body disposed in the gap between the seat body and the seat is the bearing portion of the movable shell body, the upper end surface of the upper support piece, and the lower end surface of the lower support piece. In the side view of the chair, so-called three-point support is provided, and the seat body elastically deforms in accordance with the load of the person sitting on the seat body, and the movable shell body also elastically deforms. Proportional to the size of.

Moreover, since the movable shell body is slidable at both the portions abutting and supporting the seat body and the outer shell body, the supporting portions of the movable shell body and the outer shell body are displaced due to elastic deformation, and The movable shell body and the seat body can be displaced with respect to each other, and due to the displaced movement and the elastic deformation of the movable shell body and the seat body, the body shape (weight) of the occupant
The seat body can be deformed in response to.

Further, when the load leaning on the left and right backrests becomes large, a large force is applied to the upper end portion of the upper support piece supporting the back surface of the backrest portion, and the radius of curvature of the downward convex curved portion of the upper support piece. It becomes elastically deformed so that it becomes larger, and it becomes possible to take a backward tilted posture so that the backrest part of the seat body and the upper end part of the upper support piece move backward, and this backrest part can be protected from external force. Therefore, it is possible to provide a sensitive chair with good fitness in which the degree of curvature of the seat body can automatically change according to the weight of the seated person and the degree of leaning back such that the chair can return to its original posture. is there.

As described above, according to the present invention, the cushioning performance of the seat body can be automatically adjusted to be optimum according to the weight of the person sitting on the chair, and the chair having excellent ergonomics is provided. You can do it.

Since the configuration can be achieved with a small number of parts including the outer shell body, the movable shell body, and the seat body, the degree of curvature of the seat body and the like change depending on the weight of the seated person and the degree of leaning back. The effect is that a highly sensitive chair can be constructed with a simple structure.

Further, in the chair of the present invention, since the seat body is supported on the front surface side of the outer shell body via the movable shell body, the back surface of the seat body is not directly visible in a side view and a rear view of the chair,
In addition, it is possible to give a solid feeling when the chair is viewed from the side.

〔Example〕

The chair 1 has a leg support 2 having casters on its lower end, and a support base 3 fixed to the upper end of the chair 1, and a seat receiving portion 4a and an upper end of the support base 3 extending upward. The outer shell body 4, which is integrally formed with the backrest receiving portion 4b and is substantially L-shaped in side view, is fixed.

The seat body 5 is integrally formed in a substantially L-shape in a side view, which is composed of a seating portion 5a and a backrest portion 5b, and is arranged on the front surface side of the outer shell body 4 with an appropriate gap.

Reference numeral 6 denotes a movable shell body that is inserted into a gap between the outer shell body 4 and the seat body 5, and the movable shell body 6 is composed of two upper and lower support pieces 6a and 6b having a downward convex curve, The upper end of the support piece 6b and the lower end of the upper support piece 6a are integrally formed so as to form a support portion 7 protruding upward.

The movable shell body 6 and the seat body 5 are integrally formed of an elastic material such as a reinforced plastic plate or a metal plate made of synthetic resin or impregnated with synthetic resin with glass fiber.

On the upper part of the backrest receiving portion 4b of the outer shell body 4, a bending portion 8 which is elastically deformable by an external force is formed, while the backrest receiving portion 4b is formed.
The upper end of the backrest portion 5b of the seat body 5 is attached to the fitting portion 9 at the end portion of 4b so as not to come off.

Reference numeral 10 denotes a sliding member that is stretched on the surface of the movable shell body 6 that abuts the lower surface of the seating portion 5a and the back surface of the backrest portion 5b in the seat body. The sliding member 10 has a friction coefficient. Use a fluororesin with a small value. Further, a concave groove 11 is formed on the back surface of the seat body 5 so that the movable shell body 6 does not laterally shift when sliding on the seat body 5 (see FIGS. 4 and 5).

Further, the movable shell body 6 is fixed so that the outer shell body 4 and the movable shell body 6 do not come off in the vicinity of a sliding position between the seat receiving portion 4a of the outer shell body 4 and the lower support piece 6b of the movable shell body 6. A projection pin 13 protruding from the outer shell body 4 is slidably and immovably engaged with a guide groove 12 formed in the longitudinal direction on the side.

Further, a cushion material 14 such as foamed polyurethane resin is stretched on the surface side of the seating portion 5a and the backrest portion 5b of the seat body 5.

With this configuration, when a load is applied on the seat body 5, the degree of bending of the seating portion 5a of the seat body 5 changes depending on the weight F1 of the seat body 5, and at the same time, the lower support piece of the movable shell body 6 is changed.
A force is exerted on the forward free end of 6b, the bearing 7 and the upward free end of the upper support piece 6a, and the curved state of the lower support piece 6b and the upper support piece 6a of the movable shell body 6 also changes. While the downward convex curved portions of the upper support piece 6b and the upper support piece 6a are displaced from each other with respect to the surface of the outer shell body 4,
Moreover, the lower support pieces 6b, the upper support pieces 6a, and the support portions 7 for supporting the seat body 5 are also displaced.

In this way, the curved shape of the seat body 5 of the chair changes according to the weight.

Further, when a person leans against the backrest 5b of the seat body 5, the backrest 5b is curved rearward according to the magnitude of the external force F2 directed rearward, and the upper support of the movable shell body 6 on the rear surface of the location is supported. The degree of curvature of the upper support piece 6a also changes while the support location with the upward free end of the piece 6a shifts. Lower support piece 6b at the same time
The displacement of the support portion 7, which is a connecting portion between the upper support piece 6a and the upper support piece 6a, also occurs.

As described above, since the seat body 5 and the movable shell body 6 are both elastic members, the bending resistance also increases according to the magnitude of the external force F2 (see the alternate long and short dash line in FIG. 2).

Further, as shown in FIG. 3, when a large amount of weight is applied to the front side of the seat body 5, a large load is applied to the front side of the seating portion a of the seat body 5 and the seat body 5 is bent downward and accordingly, The forward free end portion of the lower support piece 6b in the lower movable shell body 6 is also curved downward, and at the same time, the displacement of the support portion 7, which is the connecting portion between the lower support piece 6b and the upper support piece 6a, occurs.

Therefore, the elastic deformation resistance force of the seat body 5 and the movable shell body 6 (and thus the sensitivity of the cushion) also changes according to the magnitude of the backrest force.

In this way, the cushion performance that resists this is automatically performed in proportion to the weight of the person sitting on the seat of the chair and the leaning force to the backrest, so that the weight of the person It is possible to provide a chair with optimum cushioning properties regardless of whether it is light or heavy.

[Brief description of drawings]

Drawing shows an embodiment of the present invention, Fig. 1 is a perspective view of a chair,
2 is a transverse sectional view, FIG. 3 is an explanatory view of the action in a forward tilted state, FIG. 4 is a sectional view taken along line IV-IV in FIG. 3, and FIG. 5 is V- in FIG.
FIG. 6 is a sectional view taken along line V, and FIG. 6 is a sectional view taken along line VI-VI of FIG. 1 ... Chair, 2 ... Leg support, 3 ... Supporting base, 4 ... Outer shell body, 4a ... Seat receiving part, 4b ... Back support part, 5 ... Seating part, 5a ... Seating part , 5b ... backrest part, 6 ... movable shell body, 6a ... upper support piece, 6b ... lower support piece, 7 ... supporting part, 8 ... bending part, 9 ... fitting part, 10 ... ... Sliding members, 11
...... Concave groove, 12 ...... guide groove, 13 ...... projection pin, 14 ...... cushion material.

Claims (1)

[Claims] 1. A seat body having a substantially L-shape in a side view, which is composed of a seating portion and a backrest portion, is integrally formed by a plate having elasticity, while an outer shell body fixed to a leg body and the seat body. An elastically deformable movable shell body arranged in the gap with the back surface is integrally molded so that the upper support piece and the lower support piece having a downward convex curved cross section, and the connecting point in the middle thereof is a bearing section, Lower surfaces of the downward convex curved portions of the upper and lower support pieces of the movable shell body are slidably abutted on the surface of the outer shell body, and the support portion of the movable shell body and the upper end surface of the upper support piece and the lower support piece are supported. A seat body elasticity adjusting device in a chair, wherein the seat body is slidably supported on a lower end surface.