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:
Sep. 28, 1976
Filed:
Jul. 31, 1975
Richard P Folkenroth, York, PA (US);
William G Mader, York, PA (US);
Ralph J Williams, New Oxford, PA (US);
Dentsply Research & Development Corporation, Milford, DE (US);
Abstract
An operatory chair, such as a dental chair, having an upper supporting member to which the seat and back unit of an operatory chair may be attached, particularly pertaining to the mechanism by which said supporting member for the seat and back is raised and lowered. The preferred construction comprises a pair of sets of pivotally connected links arranged in lazy tong manner, said links being operated by linkage mechanism actuated by a rotatable screw and follower in such manner that the movement of the supporting member for the seat and back is smooth and relatively slow, particularly at the commencement of elevating movement so as not to include sudden and rapid upward movement as is conventional with typical lazy tong structures used in jacks and the like.