Chair

Claim 2

A chair in which the seat is free to be simultaneously moved linearly backwardly from a forward position of rest and rotated about its support leg, and designed for automatic restoration to its rest position, comprising a movable frame member for the chair seat in the form of a rectangular frame, a support member slidably fitted in said frame, a plurality of rollers slidably supporting said frame member in a fixed plane on said support member, at least one resilient cable placed intermediate said support member and said movable frame member and constantly urging said frame member linearly to rest position, a plate secured to the upper part of the support leg, means mounting said support member on said plate to rotate about the axis of said leg, and at least one other resilient cable placed intermediate said plate and said support member and constantly urging said support member angularly about said axis to an angular rest position.

Claim 3

A swivel chair, comprising a seat, a stationary leg, an elongate frame member fixed to the underside of said seat, a first support member fixed on said leg, a second support member rotatably mounted on said first support member and secured against axial movement relative thereto, means slidably mounting said frame member on said second support member for rotation therewith and for longitudinal reciprocation thereon in a fixed plane that extends transverse to said leg, first elongate resilient means normally biasing said frame member forwardly to a first limit position on said second support member, and permitting said frame member to be slid rearwardly on said second support member upon exertion of a backward force through said seat to said frame member, and second elongate resilient means connecting said second support member to said leg and normally resiliently resisting the rotation of the last-named member out of a position of rest on said first support member, and permitting rotation of said last-named member upon execution thereon of a turning moment through said seat, said mounting means including mEans permitting simultaneous linear movement of said frame member and angular movement of said second support, wherein said support member comprises a pair of circular plates having a plurality of ball bearings interposed therebetween, and said second resilient means comprises a resilient cable seated intermediate its ends in a circumferential groove formed between the confronting, marginal peripheral surfaces of said plates, and fastened at opposite ends to one of said plates and intermediate its ends to the other of said plates.

Claim 4

A swivel chair, comprising a seat, a stationary leg, an elongate frame member fixed to the underside of said seat, a first support member fixed on said leg, a second support member rotatably mounted on said first support member and secured against axial movement relative thereto, means slidably mounting said frame member on said second support member for rotation therewith and for longitudinal reciprocation thereon in a fixed plane that extends transverse to said leg, first elongate resilient means normally biasing said frame member forwardly to a first limit position on said second support member, and permitting said frame member to be slid rearwardly on said second support member upon exertion of a backward force through said seat to said frame member, and second elongate resilient means connecting said second support member to said leg and normally resiliently resisting the rotation of the last-named member out of a position of rest on said first support member, and permitting rotation of said last-named member upon execution thereon of a turning moment through said seat, said mounting means including mEans permitting simultaneous linear movement of said frame member and angular movement of said second support, wherein said support member comprises a pair of circular plates having a plurality of ball bearings interposed therebetween, and said second resilient means comprises a resilient cable seated intermediate its ends in a circumferential groove formed between the confronting, marginal peripheral surfaces of said plates, and fastened at opposite ends to one of said plates and intermediate its ends to the other of said plates.