The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1993
Filed:
Jul. 08, 1992
Sugatsune Industrial Co., Ltd., Tokyo, JP;
Kotobuki Corporation, Tokyo, JP;
Abstract
A damper device for an automatic folding chair enables the seat of the chair to be turned downward to a ready-for use position without being subjected to any braking force when it is lightly pushed down. When the use leaves the seat in the ready-for-use position, it automatically and slowly returns to an upright position under a braking effort exerted thereto. Said damper device comprises a power unit 2 and a damper unit 1 for raising the seat E slowly from the ready-for-use position to the upright position, said damper unit 1 comprising a casing 3 that rotates around a fixed shaft 4 of the chair in association with the rising movement of the seat E, a movable sleeve 7 rotatably disposed within said casing 3, viscous fluid C filled in the space between the movable sleeve 7 and the casing 3 and a one-way clutch 10 constituted by a coil spring that functionally couples the movable sleeve 7 and the fixed shaft 4 when the seat E is turned upward by the resilient force of the power unit 2 and releases the functional coupling of the movable sleeve 7 and the fixed shaft 4 when the seat E is turned downward.