Chair with adjustable seat and back rest
OwnerGunther Kunh, Ullrich Kuhninventors
Life of this patent
Estimating the term…
Abstract
A chair wherein the leg contains a gas spring which can be actuated to raise or lower a carrier for the seat and back rest. The seat is rigid wtih the carrier but the back rest is pivotally connected with the seat by hinge which contains a torque bar tending to pivot the back rest forwardly. Such pivoting of the back rest is normally prevented by a damper which operates between the carrier and a support at the lower end of the back rest and can be blocked to maintain the back rest in a selected angular position. The damper can be unblocked by a first mechanism at one side of and beneath the seat, and the gas spring can be activated by a mechanism beneath the other side of the seat.
Claims20
A chair having a total of three fulcral pivots and comprising a leg having an upper portion;
- a seat having a profiled first base element;
- a first cushion provided on and following the profile of said first base element;
- a back rest having a second profiled base element, said base elements having adjacent edge faces;
- a second cushion provided on and following the profile of said second base element;
- a carrier connecting said seat to the upper portion of said leg, said carrier being rigid with said upper portion and with said seat;
- a first fulcral pivot including a hinge disposed between said edge faces and pivotally mounting said back rest on said carrier and including means for biasing said back rest forwardly;
- and means for movably coupling said back rest to said carrier, said coupling means consisting of a support rigid with said back rest, hydraulic damper means disposed between said support and said carrier and spaced apart from said back rest a second fulcral pivot connecting said damper means to said support, and a third fulcral pivot connecting said damper means to said carrier.
A chair comprising a leg having an upper portion;
- a seat having a first side and a second side and including a first base element;
- a back rest having a second base element, said base elements having adjacent edge faces;
- a carrier connecting said seat to the upper portion of said leg, said carrier being rigid with said upper portion and with said seat;
- a hinge disposed between said edge faces and pivotally mounting said back rest on said carrier and including means for biasing said back rest forwardly;
- means for movably coupling said back rest to said carrier, said coupling means consisting of a support rigid with said back rest and hydraulic damper means connected between said support and said carrier and spaced apart from said back rest, said damper means including a first portion remote from said hinge and connected with said support, and a second portion remote from said hinge and connected with said carrier, said first and second portions being movably relative to each other to permit pivoting of said back rest relative to said seat, said damper means further including means for releasably blocking the movements of said first and second portions relative to each other to thus maintain the back rest in a selected angular position with reference to said seat;
- means for articulately connecting said second portion to said carrier, said blocking means including a protuberance movably mounted on said second portion;
- means for moving said protuberance relative to said second portion to thereby release said first and second portions for movement relative to each other, said moving means being disposed beneath and adjacent one side of said seat and including a shaft rotatably mounted on said carrier and having a handle at said one side of said seat, and a cam provided on said shaft adjacent said protuberance and movable by said shaft between at least one first position in which said blocking means releases said first and second portions for movement relative to each other and at least one second position in which said blocking means prevents movements of said first and second portions relative to each other;
- and means for biasing said cam to said at least one second position, said means for biasing said cam including a leaf spring and said cam including a flat which is engaged by said spring in the at least one second position of the cam.
Dependencies are inferred from the claim text.