Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Patent
1990-09-10
1992-05-19
Cranmer, Laurie K.
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
297301, A47C 300
Patent
active
051142104
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to tilting chairs
BACKGROUND ART
Hitherto, tilting chairs have generally incorporated a tilt mechanism independent of the frame, the tilt axis of which was located approximately midway along and underneath the seat, or otherwise substantially distant from the anterior end of the seat These chairs respond to the backward leaning of the seated occupant by simultaneous movement of both the seat portion and the back portion This often causes the occupants knees (bent over the anterior end of the seat) to rise upwardly to a height where they collide with an accompanying desk, and the lower trunk of the occupants body to sink into the posterior part of the seat, so restricting the further stretching out of the occupant. Furthermore, the leaning back of the seated occupant on such chairs causes additional pressure to the underside of the thighs of the occupant, so restricting blood circulation.
It would therefore be advantageous to develop a chair that would allow the back, and particularly the region of the back above the lumbar, of the seated occupant to be stretched or arched backwards comfortably without causing simultaneous lifting of the legs and feet of the user.
It is an object of the present invention to overcome or substantially ameliorate the abovementioned disadvantages of the prior art.
DISCLOSURE OF INVENTION
In accordance with the present invention, there is provided a chair comprising:
(i) a frame having a seat portion and a back portion adapted to support the trunk of the body of an occupant, said frame being supported on a base, and
(ii) means for allowing that part of the back portion supporting the upper trunk of the body of the occupant to tilt relative to that part of the back portion supporting the lower trunk of the body of the occupant and seat portion.
Preferably, the chair further comprises means for allowing the seat portion to tilt relative to the base, wherein the tilt axis is located underneath and substantially adjacent to the anterior end of the seat portion.
According to another aspect of the invention there is provided a chair having a seat mounted on a base and including means for allowing the seat portion to tilt relative to the base, wherein the tilt axis is located underneath and substantially adjacent to the anterior end of the seat portion.
Preferably, the seat tilting means includes a pair of vertically spaced apart substantially U-shaped support members, the upper support member supporting the anterior end of the seat portion, the lower support member being supported by the base, each free arm of the upper support member being connected to its corresponding free arm of the lower support member by a flexible U-shaped connecting member, the arrangement being such that with the application of weight by the seated occupant, the upper support member will move through an arc relative to the fixed position of the lower support member by bending of both of the connecting members.
BRIEF DESCRIPTION OF THE DRAWINGS
In order that the invention may be more readily understood and put into practical effect, reference will now be made to the accompanying drawings in which:
FIG. 1 is a perspective view of the frame and base of a chair according to a preferred embodiment of the invention.
FIG. 2 is an isometric side view of the frame and base of the chair of FIG. 1 with the seat portion partially cut-away to show the seat tilting means and showing the means for tilting of the back portion.
FIG. 3 is a perspective view of two adjoining chair frames, each chair frame operating according to the embodiment of FIG. 2.
FIG. 4 is a partly cross-sectional side view of the joining assembly for the adjoining chair frames of FIG. 3.
DESCRIPTION OF PREFERRED EMBODIMENTS
The frame and base of FIG. 1 has a main frame 10 mounted on a base 11 upon which the main frame 10 is adapted to swivel about shaft 12. The main frame 10 supports the backing fabric 13 by way of pins 14 which are hooked at both ends. The site of attachment of each pin
REFERENCES:
patent: 4084850 (1978-04-01), Ambasz
patent: 4451085 (1984-05-01), Franck et al.
patent: 4529247 (1985-07-01), Stumpf et al.
patent: 4711491 (1987-12-01), Ginat
patent: 4744600 (1988-05-01), Inoue
patent: 4889385 (1989-12-01), Chadwick et al.
Cranmer Laurie K.
Maxton Fox Commercial Furniture Pty. Ltd.
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