Chair

Details Chair Chair

1986-05-21

1987-08-11

McCall, James T.

Chairs and seats

Bottom or back with means to alter contour

297301, 297353, A47C 300

Patent

active

046857338

ABSTRACT:
A chair having a seat member rotatably supported about a swivel point in the region of its front edge relative to a seat carrier. The chair also has a back member connected to at least one lever which is pivotally supported on the seat carrier. The lever is connected so that in the case of an inclination of the back member there simultaneously occurs in a predetermined relationship an inclination of the seat member so that the area of the seat back in the region of the user's lumbar vertebra is changed in such a way that the support is at an optimum during each inclined position of the seat back. A control member is hingedly connected at one end to the back member below the point of its engagement with the lever. The control member is hingedly connected to the seat carrier or to the seat at its other end in a first pivot axle spaced from a second pivot axle of the lever on the seat carrier. The lever and the control member are hingedly connected with one another by means of a connecting element, so that a relative movement between the lever and the control member in the coupling point or between the control member and its connecting point on the seat carrier or on the seat can occur.

REFERENCES:
patent: 488992 (1893-01-01), Forney
patent: 3588172 (1971-06-01), McGregor
patent: 4380352 (1983-04-01), Diffrient
patent: 4560199 (1985-12-01), Sapper

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