Chairs and seats – Movable bottom – Tiltable
Patent
1989-03-14
1990-05-29
Aschenbrenner, Peter A.
Chairs and seats
Movable bottom
Tiltable
297354, 403162, A47C 100
Patent
active
049290231
ABSTRACT:
An improved reclining chair particularly for dental and medical patients utilizes structure and mechanism of a prior conversion unit for mounting such a chair on a pedestal base. Novel features that improve stability of the chair during use are provided. The conversion unit includes an elongate chassis frame having respective chair back and chair seat frame sections that are pivotally interconnected end-to-end and provided with a mounting plate adpated to fasten the unit to a pedestal base and on which the chassis frame is cradled for back or forth rocking movement under the control of the dentist, doctor, or other operator. The novel features are the mounting of a leaf spring to serve as a shock absorber for the chair seat frame section as it aproaches its lowermost position in the rocking movement of the chassis frame, the provision of a resilient interconnection between the two chassis frame sections for stabilizing the chair back frame section in its pivotal connection with the chair seat frame section, particularly as the chair back frame section moves into its lowermost position in the rocking movement of the chassis frame, and an especially rigid yet smooth working "hinge" arrangement between chair seat chassis frame section and chair back chassis frame section.
REFERENCES:
patent: 3637186 (1972-01-01), Greenfield
patent: 4318568 (1982-03-01), Ericsson
patent: 4441835 (1984-03-01), Davis
patent: 4572573 (1986-02-01), Yosikawa et al.
patent: 4722566 (1988-02-01), Castellini
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