JPH061002Y2 - Chair - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a chair in which a occupant can greatly tilt backward.

Conventional technology and its problems There are various types of chairs for office work, learning, comfort, various work, body correction, etc., but in any application, if the body simply supports the body. Instead, it is often desired that the user can move the body when necessary. In particular, in order to release the body when sitting for a long time, it is often desired to tilt the upper body backward from the sitting posture by the force of the seated person. As such a chair that can be tilted backward, a chair in which a backrest plate is mounted so as to be rotatable about a horizontal axis with respect to frames extending on both sides of the chair, and a frame supporting the backrest plate is centered around the lower end in the front-back direction. There is something that can be rotated. However, a chair that does not have a frame for supporting the backrest and is difficult to provide a rotating portion, such as a chair such as a sofa, cannot be a chair that can take such a backward leaning posture. There wasn't.

The present invention solves such a problem and enables a large backward leaning of a seated person even in a structure where it is difficult to provide a rotating portion without a frame for supporting a backrest portion such as a sofa. The purpose is to provide a chair that can.

Means for Solving the Problems The above object of the present invention comprises a seat portion, a leg portion below the seat portion, and a backrest device provided at a rear portion of the seat portion and the leg portion, and the backrest. The device includes a guide portion extending vertically from a lower portion of the chair, a sliding rod extending upward from inside the guide portion and capable of sliding vertically by being guided by the guide portion, and fixed to the sliding rod upper end portion, The backrest member, which can be moved downward together with the sliding rod by being guided by the guide portion from the elevated position supporting the back of the occupant, and the guide portion and the sliding rod, is mounted between the occupant and the seat occupant. Accordingly, a spring device that biases the sliding rod upward so that the backrest member and the sliding rod can move downward against a spring force, and the guide portion that is stretched between the seat portion and the backrest member. And a hanging cloth covering the sliding rod. This is achieved by a chair characterized by that.

Embodiments Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a sofa type chair according to an embodiment of the present invention. The chair comprises a seat (3), legs (2) below the chair, and a backrest device (1) provided at the rear of these. The backrest device (1) has a second
As shown in the figure, a pair of vertically extending cylindrical guide portions (10) fixed to the supporting member (20) at the rear portion of the leg portion, and a pair capable of sliding up and down guided by the guide portions (10). Sliding rod (11) and sliding rod (1
1) A backrest member (12) which is attached to an upper end portion and can move in parallel with the sliding rod in a vertical direction along a guide portion (10), and a compression coil spring (which is mounted in a cylindrical guide portion (10) ( 13) and. The guide part (10) is closed at the lower end and the sliding rod (1
It is narrowed to guide 1). Sliding rod (1
1) has a flange (11) for supporting springs and retaining at the lower end.
0). The backrest member (12) has a columnar outer shape extending in the horizontal direction, and the upper end of the sliding rod (11) is inserted into the core of the cushioning outer cover and fixed to the sliding rod. Backrest member (12) and seat (3)
The space between the leg and the leg (2) is covered with a drape (120) so that the guide (10) and the sliding rod (11) cannot be seen from the outside. The compression coil spring (13) has its upper end abutting on the flange (110) and its lower end abutting on the bottom of the guide portion (10), and biases the sliding rod (11) upward. In this example, the guide portion (10) is inclined in a direction in which the upper portion thereof faces forward, and accordingly, the sliding rod (1
The sliding direction of 1) is inclined so as to be slightly rearward when descending. The sliding range of the sliding rod (11) is such that the backrest member (12) can take a raised position for supporting the back of the chair occupant and a lowered position near the seat portion (3). And the length of the sliding rod (11). The strength of the spring (13) is selected so that the backrest member (12) and the sliding rod (11) move downward while giving a proper supporting reaction force to the occupant by the load when the occupant is tilted backward.

With the above structure, this chair operates as follows. When the occupant takes a normal sitting posture on the chair, the backrest member (12) is in the raised position, and the chair can be used as a normal chair. When the occupant leans backward from the posture, the backrest member (12) and the sliding rod (1) are loaded by the occupant's load.
1) descends against the force of the spring (13). Since the sliding rod (11) descends slightly rearward due to the inclination of the guide portion (10), the sliding rod (11) conforms to the load direction of the occupant and operates smoothly. Therefore, the inclination is 3 with respect to the vertical direction.
It is desirable that the angle is not less than 30 °, and it is desirable that the angle is not more than 30 ° in order to avoid unnecessary protrusion to the rear of the chair. When descending, the spring (13) provides the seating person with a moderate supporting force,
The occupant can lean back at a suitable speed. When the backrest member (12) reaches the lowered position, as shown in FIG. 3, the occupant is supported by the back at a position slightly above the seat (3) and greatly leans backward and warps. When returning to the original posture, the occupant can easily raise his / her upper body by receiving the pushing force of the spring (13). In this way, it is possible to obtain a large range of backward tilt of the chair occupant.

In the above example, the pair of guide portions and the sliding rod are provided, but by supporting the central portion of the backrest member,
It is also possible to provide one guide part and a sliding rod. As the spring device, in addition to the compression coil spring in the above example, various springs such as tension springs, air springs, and combinations thereof that are used for reciprocating motion with ordinary biasing force can be used. The guide portion can adopt various structures capable of guiding the sliding rod while applying the spring force of the spring device to the sliding rod. For example, two rod members extending in parallel with the sliding rod interposed therebetween. Can be provided.

Effects of the Invention As is clear from the above, according to the present invention, it is possible to provide a chair having the following effects. That is, with the backrest member fixed to the upper end portion of the rod, the rod is supported slidably by the vertically extending guide portion and the spring device in the guide portion, and is supported by an upward biasing force. It is assumed that no rotating structure is required in the backrest. As a result, even in a chair, such as a sofa, which does not have a frame for supporting the backrest portion and in which it is difficult to provide the rotating structure, the seated person can be largely tilted backward.

Further, the backrest member is attached to the upper end portion of the sliding rod and is guided by the guide portion together with the sliding rod so that the backrest member can move in parallel in the vertical direction, so that expansion and contraction of the spring mounted between the sliding rod and the guide portion. The direction and the moving direction of the backrest member always match. As a result, the upward biasing force of the spring is substantially proportional to the vertical displacement of the backrest member. Therefore, when the backrest member largely descends due to the rearward leaning of the occupant, a large supporting force is obtained along with this, and a stable backward leaning posture and a returning operation from the posture can be obtained.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view of an example of a chair, and FIG. 2 is a vertical sectional side view of a main portion of a backrest device in the chair of FIG. 3 is a side view showing one use state of the chair shown in FIG. (1) ... Backrest device (2) ... Leg (3) ... Seat (10) ... Guide (11) ... Sliding rod (12) ... Backrest member (13) ... Compression coil spring

Claims (1)

[Scope of utility model registration request] 1. A seat portion, a leg portion below the seat portion, and a backrest device provided at a rear portion of the seat portion and the leg portion,
The backrest device includes a guide portion that extends vertically from a lower portion of the chair, a sliding rod that extends upward from inside the guide portion and can slide up and down guided by the guide portion, and is fixed to an upper end portion of the sliding rod. Is mounted between the guide portion and the sliding rod and a backrest member that can be moved downward together with the sliding rod by being guided by the guide portion from a raised position that supports the back of the occupant. A spring device for urging the sliding rod upward so that the backrest member and the sliding rod can be lowered against the spring force with inclination, and the guide which is stretched between the seat portion and the backrest member. A chair having a section and a drape covering the sliding rod.