Retractable legrest for dental chair

Details Retractable legrest for dental chair Retractable legrest for dental chair

1988-01-27

1989-11-07

Aschenbrenner, Peter A.

Chairs and seats

Legrest or footrest interconnected to move relative to...

297429, 297436, A47C 750

Patent

active

048787094

ABSTRACT:
An air cylinder 8, pivotally carried at 7 proximate the front end of a dental chair, when extended moves a legrest frame 4 and an extension frame 11 to an extended position through a linkage mechanism including three pairs of linkage arms 21, 23, and 26. Each linkage arm 21 is pivotally connected to seat 1 at one end, and to a linkage arm 23 at the other. Linkage arms 23 are pivotally carried by a sub-frame 6, connected to and movable by cylinder 8, and are each pivotally connected at their other ends to linkage arm 26 pivotally carried by frame 11. The arrangement and sizing of linkage arms 21, 23 and 26 and their pivotal connection to each other and frames 6 and 11 is such that extension frame 11 when extended moves slowly at first and then more rapidly. A spring roller 16, tension belt 17 and sheet 18 cooperate with extension 11 to retract same.

REFERENCES:
patent: 2919746 (1960-01-01), Fidel
patent: 3858938 (1975-01-01), Kristensson et al.
patent: 3964786 (1976-06-01), Mashuda
patent: 4509795 (1985-04-01), Brennan et al.

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