Office chair with a guidable seat back
AssigneeDrabert GmbH
InventorDirk Husemann
Life of this patent
Estimating the term…
Abstract
An office chair is provided. The office chair includes a seat back that can follow the motions of the upper body of a person seated in the seat. The seat back of the office chair includes a restoring spring in the form of a mechanical screw pressure spring. A piston is coaxially disposed in the screw pressure spring. The piston inserts in a piston sleeve, whereby the piston has locking pieces that can be extended radially to the outside, which are placed on the peripheral edge of the piston sleeve in the hooked-out state and in a largely extended position of the piston.
Claims9
An office chair with a chair back, whose chair back carrier is mounted on a chair carrier that is held stationary so that it can turn around a horizontal axis such that the seat back carrier can be turned backward against the pressure of a restoring force, and that follows a frontward-directed motion of the upper body of the person seated on the seat, said chair comprising:
- a restoring spring constructed and arranged to apply the restoring force and shaped in the form of a mechanical screw pressure spring, which is arranged between a thrust bearing assigned to the seat back carrier and a thrust bearing assigned to the chair carrier,
- a piston attached to one of the thrust bearings coaxially in the screw pressure spring, and insertable into a piston sleeve attached to the other thrust bearing;
- and
- first and second locking pieces that are extendable radially outward from the piston and which are placed on a peripheral edge of piston sleeve in a hooked-out state in a substantially extended position of the piston;
- wherein the seat back carrier can be locked into a frontward turned position by engagement of the locking pieces.
An office chair with a chair back, whose chair back carrier is mounted on a chair carrier that is held stationary so that it can tun around a horizontal axis such that the seat back carrier can be turned backward against the pressure of a restoring force, and that follows a frontward-directed motion of the upper body of the person seated on the seat, said chair comprising:
- a restoring spring constructed and arranged to apply the restoring force and shaped in the form of a mechanical screw pressure spring, which is arranged between a thrust bearing assigned to the seat back carrier and a thrust bearing assigned to the chair carrier,
- a piston attached to one of the thrust bearings coaxially in the screw pressure spring, and insertable into a piston sleeve attached to the other thrust bearing;
- and
- wherein first and second locking pieces are provided at first and second end pieces of a spring-apart scissors, which is mounted in a piston and whose end pieces extend out from a peripheral surface of the piston when first and second manipulation ends of the spring-apart scissors are pressed together, the first and second locking pieces being extendable radially outward from the piston and placed on a peripheral edge of the piston sleeve in a hooked-out state in a substantially extended position of the piston;
- wherein the pressing together of the first and second manipulation ends of the spring-apart scissors is permanently produced by a spring force and the first and second manipulation ends of the spring-apart scissors are pressed apart by means of a feed wedge to retract the fist and second end pieces of the spring-apart scissors into the piston;
- wherein the seat back carrier can be locked into a frontward turned position by engagement of the locking pieces.
Dependencies are inferred from the claim text.