Articulated headrest mechanism

Details Articulated headrest mechanism Articulated headrest mechanism

1989-01-12

1989-09-05

McCall, James T.

Chairs and seats

Collapsible chair; i.e., relatively folding bottom, back,...

With folding armrest

297 61, 297408, 297409, A47C 710

Patent

active

048632180

ABSTRACT:
A headrest tilting mechanism includes a bar having first and second ends, with a headrest mounting portion proximate the first end and a substantially straight portion proximate the second end. A support means includes a curved cam surface and a pin having ends rotatably coupled to the support means. The pin has a cross-slot therethrough and a portion of the bar which is intermediate the first and second ends passes through the cross-slot. A cam following means attached to the bar proximate the second end causes the second end to follow the cam surface of the 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.

REFERENCES:
patent: 3057657 (1962-10-01), Fletcher
patent: 3817576 (1974-06-01), Ciavattoni et al.
patent: 4353595 (1982-10-01), Kaneko et al.
patent: 4413858 (1983-11-01), Beach
patent: 4511180 (1985-04-01), Klaus
patent: 4515406 (1985-05-01), Fujiyama et al.
patent: 4647108 (1987-03-01), Hayashi
patent: 4674797 (1987-01-01), Tateyama
patent: 4761034 (1988-08-01), Saito

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