Curved articulating headrest support bar

Details Curved articulating headrest support bar Curved articulating headrest support bar

1988-12-15

1989-07-18

McCall, James T.

Chairs and seats

Headrest

297 61, 297408, 297409, A47C 710

Patent

active

048488380

ABSTRACT:
A headrest tilting mechanism includes a curved bar having first and second ends, with a headrest mounting portion proximate the first end and a cam following means proximate the second end. A support means includes a curved cam surface which is engaged by said cam following means, and a pin. The pin slidably engages a portion of the bar which is intermediate the first and second ends so as to allow said bar to be slidable with respect to said support means. The cam following means causes the second end to follow the cam surface of the support means when said bar is slid with respect to said support means. With this arrangement, the curved cam surface is not located at the very top of the chair back and therefore the head of the patient can be significantly closer to the lap of the dentist than prior art arrangements. Furthermore, due to the curvature of the bar, the degree of curvature of the cam following surface can be reduced.

REFERENCES:
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Thesis of Albrecht Baumann entitled "Entwurf einer motorisch bewegten . . . " presented to the Institut Fur Arbeitswissenschaft Technische Hochschule Darmstadt on Aug. 4, 1986.

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