Multifunction and multiposition chair

Details Multifunction and multiposition chair Multifunction and multiposition chair

1989-09-27

1992-07-07

Chen, Jose V.

Chairs and seats

Legrest or footrest interconnected to move relative to...

297 69, A47C 102

Patent

active

051277050

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a multifunction and multiposition chair which can be transformed automatically under the action of a jack into any intermediate position between a totally recumbent position and an orthostatic position for the user, of the type comprising a back, a seat and a footrest, the movements of displacement from one position to another being provided by a rod assembly which links the various elements to one another and forms a plurality of chains of the back, the seat and the footrest respectively.
A chair of this type has already formed the subject, by way of a nonlimiting example, of patent application Ser. No. EP 0,183,630.
This device is entirely satisfactory but it has been found that its operation can be improved still further.
The object of the present invention is to remedy this while preserving the practical usability of the previous embodiment.
According to the invention, this result is achieved with a multifunction and multiposition chair which can be transformed automatically under the action of a jack into any intermediate position between a totally recumbent position and an orthostatic position for the user, of the type comprising a back, a seat and a footrest, the movements of displacement from one position to another being provided by a rod assembly which links the various elements to one another and forms a plurality of kinematic chains sequentially providing the various movements of the back, the seat and the footrest respectively, which comprises respectively:
an assembly for controlling the footrest;
an assembly for controlling the seat;
an assembly for controlling the mechanism for positioning the back and for maintaining said back in the vertical position, which acts on an underframe complementary to said seat, it being possible for the footrest to be totally retracted in the intermediate sitting and vertical position and to form the extension of the seat and the back in the horizontal position.
The invention will be better understood with the aid of the following description of a preferred embodiment, with reference to the accompanying schematic drawings which illstrate the various kinematic chains in side views in which:
FIG. 1 is a view in the totally recumbent position;
FIG. 2 is an intermediate view between the recumbent position and the sitting position;
FIG. 3 is a subsequent intermediate view between the recumbent position and the sitting position;
FIG. 4 is a view in the sitting position;
FIG. 5 is a general view in the upright position with
FIG. 5A illustrating the mechanism which provides the positioning of the back and of the seat and from which the footrest mechanism has been omitted; and
FIG. 5B illustrating the mechanism which provides the positioning of the footrest.
In the text which follows, reference will be made to the figures collectively, without this being expressly mentioned.
The chair according to the invention is composed essentially of:
These various elements are shown more particularly in FIGS. 5A and 5B.
It is designed to be displaced between a plurality of positions between the recumbent position shown in FIG. 1 and the orthostatic position shown in FIG. 5, through all the intermediate positions and in particular the sitting position shown in FIG. 4.
All these displacements and the maintaining in the fixed position are provided by a single control jack (6), the strap (7) of which is fixed and articulated on the supporting structure (5) at a point (8) situated towards the front of the chair and the slide (9) of which is linked by a distal articulation at (10) to a brace (11) of the back (1).
The jack is controlled by a control box operated by the user, or a third party, and provides all the various displacements.
The mechanism for controlling the footrest consists essentially of two small connecting rods (12, 13) and a spring (14).
As shown in FIG. 3, it will be noted that the small connecting rods (12, 13) are articulated to one another at a point (15). Moreover, the small connecting rod (12) for receiving the footrest is articulat

REFERENCES:
patent: 2322683 (1943-06-01), Costa et al.
patent: 3095235 (1963-06-01), Babcock et al.
patent: 3284126 (1966-11-01), Piazza
patent: 3406772 (1968-10-01), Ahrent et al.
patent: 3640566 (1972-02-01), Hodge
patent: 4267490 (1981-05-01), Thione
patent: 4492407 (1985-01-01), Broadhead
Allen S. Hall, Jr. "Kinematics and Linkage Design" 1961 pp. 1-10.

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