Dental chair headrest locking device

Details Dental chair headrest locking device Dental chair headrest locking device

1977-07-25

1978-09-05

Mitchell, James C.

Chairs and seats

Headrest

Adjustable rectilinearly vertically

248414, A47C 110

Patent

active

041114841

ABSTRACT:
A headrest mounted above a dental chair backrest can readily be positioned by means of a headrest bar engaging a locking device affixed to the chair backrest. The locking device comprises a pair of resilient rubber surfaces or other high friction material surfaces which grip or contact the headrest bar to positively lock the headrest in position. By merely pushing the headrest to a more vertical position, the headrest bar is caused to lose contact with the gripping surfaces. A spring-loaded block is selectively disposed through each of the high friction surfaces to urge the bar in stronger contacting relation with said high friction surfaces in any operating position of the headrest, the blocks themselves also providing low friction surfaces against which the bar may ride when the headrest is being repositioned by initially pushing it to a more vertical position.

REFERENCES:
patent: 2827110 (1958-03-01), Rising
patent: 3454303 (1969-07-01), Dangauthier
patent: 3635527 (1972-01-01), Weber
patent: 3642321 (1972-02-01), Schwarz
patent: 3698765 (1972-10-01), Olsen

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