Chairs and seats – Movable bottom – Tiltable
Patent
1997-04-08
1998-07-28
Nelson, Jr., Milton
Chairs and seats
Movable bottom
Tiltable
297DIG4, A47C 102
Patent
active
057853843
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a device for an adjustable chair, where the back of the adjustable chair at a first mounting site on each side thereof is pivotally connected to respective side members of the chair, and at a second mounting site forms a hinged connection with a rear part of the chair seat frame, where the chair seat frame, at a front mounting site on each side thereof, slidably connected to one of the to respective side members along a front guide which forms a part of the side member, wherein said first mounting site on the chair back is designed to slide along forward and downward inclining rear guide in the side member, and wherein the seat frame on each side has a rear mounting site between said front mounting site and said second mounting site for the chair back, said rear mounting site forming a slidable connection with a central guide in each respective side member, which is located between the front guide and the rear guide when seen in the longitudinal direction of the side member.
From the prior art, reference shall be made to GB Patent No. 1278501, DE Patent No. 3822877, U.S. Pat. No. 4,759,561, and also a chair marketed under the trade mark STRESSLESS.RTM.. The last-mentioned chair type is also characterised, inter alia. in that the centre of gravity of the body in relation to the chair is kept virtually constant, usually near or above the central frame of the chair, if the chair is of the swivel type. A major aspect of the known chair type is, however, that when the back tips backward the lower end of the chair back remains at the same level as the back edge of the chair seat. This is due to the seat back and the chair seat being connected to one another at the lower edge of the chair back and the rear edge of the chair seat, respectively. When the chair user leans backwards in the chair, he may experience the sensation of the chair back apparently "climbing" up his back a little. On leaning back it is, of course, important that the head rest and similar are felt to be approximately in the same place irrespective of the sitting position.
This problem is nonetheless important in connection with adjustable wheelchairs, where being able to adjust the back in relation to a fixed seat or having the seat and back then rigidly connected to one another and be tiltable or adjustable as a unit are typical configurations. Furthermore, it has been known in connection with adjustable wheelchairs that these require at least one support leg which projects out behind the large wheelchair wheels to prevent the chair from tipping backward when the chair user leans back in the chair.
SUMMARY OF THE INVENTION
It has thus been one of the objects of the present invention to provide a device for an adjustable chair of the aforementioned type, wherein the aforementioned drawbacks both in normal adjustable chairs of this kind and especially in wheelchairs can be remedied. The invention seeks in the first place to provide good sitting comfort in an adjustable chair of this kind, and in the event of the invention being applied for use in a manual wheelchair, the otherwise good sitting comfort of the comfort wheelchair will be capable of being combined with the driving and transport properties of the active wheelchair. The object of the present invention, especially in connection with a wheelchair, is to be able to combine an "active driving position" with a "passive resting position" in one and the same wheelchair.
According to the invention, the device mentioned by way of introduction is characterized in that the front guide is inclined forward and upward and forms an angle with the horizontal in the range of 10.degree.-45.degree., that the central guide forms an angle with the horizontal in the range of 0.degree.-15.degree., and that the rear guide is slightly curved, and forms an angle with the horizontal in the range of 15.degree.-45.degree..
In a preferred embodiment, the central guide is inclined forward and upward with an angle not exceeding 15.degree. relative to
REFERENCES:
patent: 809944 (1906-01-01), Hanger
patent: 3572829 (1971-03-01), Malitte
patent: 4759561 (1988-07-01), Janssen
patent: 4865384 (1989-09-01), Desanta
Handicare Industri A/S
Jr. Milton Nelson
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