Chairs and seats – Movable bottom – Interconnected with back for relative concurrent movement
Patent
1977-10-11
1979-11-06
Zugel, Francis K.
Chairs and seats
Movable bottom
Interconnected with back for relative concurrent movement
248421, 297330, A61G 1500
Patent
active
041733720
ABSTRACT:
A dental chair comprising a pedestal, a lifting assembly mounted on the pedestal, a parallelogram assembly supported by the lifting assembly, a seat assembly pivotally mounted on the parallelogram assembly, and a backrest assembly pivotally mounted to the seat assembly. The lifting assembly is capable of moving the parallelogram assembly horizontally while simultaneously raising or lowering it, thereby causing the seat and backrest assemblies to move vertically without substantial horizontal motion. The seat assembly is hingedly mounted to the parallelogram assembly and includes a transverse shaft and drive means therefor. Means separately link said shaft to the parallelogram and backrest assemblies, such that rotation of said shaft by its drive means causes simultaneous pivotal motion of the seat and backrest assemblies, thereby permitting adjustment of the seat and backrest of the chair to their most convenient inclinations for a given dental treatment. The entire chair is rotatable on the pedestal, and a locking means including an eccentric linking means is provided for locking the chair in any rotational position.
REFERENCES:
patent: 521256 (1894-06-01), Browne
patent: 2792873 (1957-05-01), Herider et al.
patent: 3083055 (1963-03-01), Davis
patent: 3479086 (1969-11-01), Sheridan
patent: 3596982 (1971-08-01), Grams
patent: 3698673 (1972-10-01), Olsen
patent: 3982718 (1976-09-01), Folkenroth et al.
Reynolds Gary
Tai Harold Y.
Zugel Francis K.
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