US 4,375,902 A · Locking headrest for dental chair

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.

Claims21

Dependent claims

A headrest for a chair, comprising:

support means for attaching said headrest to a chair;
a headrest frame pivotally connected to said support means;
a locking block pivotally connected to said headrest frame, said locking block having a bore extending therethrough;
a locking shaft having one end thereof pivotally connected to said support means and the other end thereof extending through said bore, said locking shaft having a diameter smaller than the diameter of said bore, said locking shaft being slidable within said bore when aligned therewith;
and
means for engaging an edge of said locking of block adjacent said bore against the surface of said locking shaft to lock said locking shaft in a predetermined position within said bore.

3 more elements

A headrest for a chair, comprising:

support means for attaching said headrest to a chair;
a headrest frame pivotally connected to said support means;
a locking shaft having one end thereof pivotally connected to said support means;
locking means connected to said headrest frame for receiving said locking shaft, said locking means including means forming a bore therein for receiving said locking shaft;
said locking shaft having a diameter smaller than the diameter of said bore and being slidable therein when aligned therewith;
and
means for engaging an edge of said bore forming means against the surface of said locking shaft to lock the locking shaft in a predetermined position within said bore.

4 more elements

Dependencies are inferred from the claim text.

Locking headrest for dental chair

Life of this patent

Locking headrest for dental chair

Life of this patent

Abstract

Claims21