Abstract: A dental chair headrest which may be positioned and locked in a predetermined angular orientation relative to the seat back. A support base allows height adjustment and has a headrest frame pivotally connected thereto. The locking mechanism includes a locking shaft pivotally connected to the support base and extending through a bore within a locking block pivotally connected to the headrest frame. Alignment of the locking shaft and bore allows the adjustment of the headrest angle, and pivoting the locking block engages the edges of the bore with the surface of the locking shaft to retain the locking shaft in a predetermined position within the bore. The headrest is covered by a resilient material, and a positioning lever extends from the locking block to a location where the positioning lever may be actuated by pressure on the resilient material to disengage the locking block from the locking shaft.

Abstract: A dental chair comprising a pedestal, a lifting assembly mounted on the pedestal, a parallelogram assembly supported by the lifting assembly, a seat assembly pivotally mounted on the parallelogram assembly, and a backrest assembly pivotally mounted to the seat assembly. The lifting assembly is capable of moving the parallelogram assembly horizontally while simultaneously raising or lowering it, thereby causing the seat and backrest assemblies to move vertically without substantial horizontal motion. The seat assembly is hingedly mounted to the parallelogram assembly and includes a transverse shaft and drive means therefor. Means separately link said shaft to the parallelogram and backrest assemblies, such that rotation of said shaft by its drive means causes simultaneous pivotal motion of the seat and backrest assemblies, thereby permitting adjustment of the seat and backrest of the chair to their most convenient inclinations for a given dental treatment.

Abstract: A dental chair is disclosed which has an adjustable headrest incorporating a flush mounted adjustment mechanism allowing (1) adjustment about a central pivot, (2) vertical adjustment or (3) forward and rear adjustment. The dental chair also incorporates deflectable "wing" portions adjacent each of the arm supports which do not need adjustment and which allow the dentist more ready access to the patient.