Chairs and seats – Back movement resiliently opposed in operating position – Back adjusts independent of seat
Patent
1996-10-15
1998-01-06
Nelson, Jr., Milton
Chairs and seats
Back movement resiliently opposed in operating position
Back adjusts independent of seat
2973035, A47C 300
Patent
active
057046891
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a comfortable chair for a chair occupant even though seated in the chair for long time periods. The chair includes a back support divided into a separate and independently controlled waist support and shoulder support. The waist support supports the waist and the shoulder support supports the shoulders simultaneously and individually.
2. Description of the Related Art
In general, in order to provide a comfortable chair, it is necessary to support a person's backbone inclination or adjust the back support inclination to a person's posture. Typically, there are two methods of adjusting a back support's inclination, one is that a back support is moved back while maintaining elasticity or resilient resistance as one who is seated puts force upon it and the other is that one seated manually controls the inclination of the back support.
However, there is a problem of controlling the inclination of a portion supporting a waist and shoulder respectively because the back support is composed of one body.
Backbone inclinations and seat postures vary substantially. If the back support is composed of one body, if a waist is to be supported against a chair back, a shoulder is not supported, or if a shoulder is to be supported against a chair back, a waist is not supported. Therefore, there is a problem of decreasing the efficiency of work because of feeling fatigued from using a chair during long hours.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a chair having a back support which includes a separate waist support and shoulder support which can be used without feeling fatigued during long hours because the waist and shoulders of one seated are simultaneously and individually supported without respect to the backbone inclination and seat posture of one seated.
To achieve the above object, the present invention provides a back support of a chair divided into a waist support for supporting a waist, a shoulder support for supporting a shoulder, a waist support member and a shoulder support member constructed so that the waist support and shoulder support can be separately moved.
In a conventional chair in which the back support is moved back against resilient resistance as one seated applies force against the back support, the conventional back support is constructed of one body. The back support is connected to a hinge shaft under a chair seat plate by means of support members composed of one or two coil springs coupled to the support members. Therefore, the back support is moved back against resilient resistance of the support members which can be adjusted by control knobs engaging the coil spring or springs.
However, in one embodiment of the present invention, a back support is divided into a waist support and shoulder support, which are directly coupled to a seat plate by means of respective different support members and a hinge shaft. The waist support and shoulder support are pivotally movable about the hinge shaft with such movement being controlled by a resilient structure in the form of a coil spring adjustably connecting the seat plate and the respective support members. Therefore, the respective support members are independently resiliently controlled and a control knob is installed to control the elastic force exerted by each coil spring.
In a second embodiment of a chair having a back support separated in accordance with the present invention, a back support is divided into a waist support and shoulder support, the waist support is coupled to a hinge shaft under a chair seat plate by waist support members, a shoulder support is coupled to a hinge shaft installed at the upper end of the waist support by shoulder support members, an elastic material of springs is installed so that the waist and shoulder support members can have elasticity. Therefore, the waist and shoulder support are pulled back against the elastic force respectively. In this embodiment of the invention, the b
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