Chairs and seats – Movable bottom – Movable independently of back
Patent
1997-07-22
1999-09-14
Cuomo, Peter M.
Chairs and seats
Movable bottom
Movable independently of back
29742338, 29742326, A47C 106
Patent
active
059511052
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a chair having an adjustable seat and an ergonomically cooperating foot support to be used at high tables, especially in schools.
Within the school, tall pupil tables are tried out in order to avoid load damages affecting teachers bending forwardly during guidance, together with tall chairs to prevent back problems affecting pupils, giving them the possibility of changing between usual "passive" sitting position (90.degree. between calf (lower leg) and thigh on the one hand and between thigh and body on the other hand) and a more open "active" sitting position (120.degree. between calf and thigh respectively between thigh and body).
Such a work-place has been developed by DR. A. C. Mandal, Denmark, and is produced i.a. by MK Stalm.o slashed.obler a.s., DK-5500 Middelfart. Disadvantages consist in that many chair variants are required; the foot support of the chair for "passive" sitting position must be adjusted separately; the table must be adjusted vertically separately; the various levels of the tables differ, and the foot support of the table for "active" sitting position must be adjusted separately.
The same favourable working position is achieved by teacher and pupil if all adjustments are gathered on the chair, using tables positioned at one fixed level. Tables without adjustments are labour-saving and prevent risks for errors. Equal table level is necessary upon grouping.
Such a chair is disclosed in Norwegian patent specifications Nos. 135,118 and 150,743, now cancelled. The disadvantage of this chair is that the vertical distance from seat to tabletop as well as the vertical distance from foot support to seat must be adjusted separately; the chair does not offer any possibility of sitting in an open "active" position, and it is only intended for usual dining table levels.
SUMMARY OF THE INVENTION
The invention is based on the above-mentioned, known solutions, but it has the advantage that when the seat is set at a correct level beneath the tabletop, it is automatically positioned at a correct distance from the back of the chair as well as at a correct level above foot supports for active and passive working positions, gathered in one and the same hand grip. A simple adjustment saves work and prevents risks for errors; the chair offers possibilities for varied sitting positions; the same chair may be used for persons having a difference of 70 cm in body length, simplifying both purchase and storage.
According to the invention, synchronous adjustment is achieved in that, when the seat, as known, is displaced along the guidance portion extending obliquely upwardly and rearwardly, to a desired level below the tabletop at a correct level and distance from the back of the chair, a strut attached to the seat lifts with it the foot support for passive sitting position to a correct distance from the seat. Simultaneously, a strut from foot support for passive sitting position carries another foot support for active sitting position to correct height level in relation to the seat. Seat level and, thus, all other adjustments, are locked in a desired position, the part carrying the seat in a correct angle relative to the underframe (the guidance portion) being attached thereto as known: the user, locks the seat infinitely variable in correct position on the guidance portion; the user, locks the seat infinitely variable in correct position on the guidance portion, with the addition of a clamp device of known structure, preventing the seat from being displaced due to a mishap; the seat, said pin engaging a hole in an opposing part and, thus, locking the two parts together in fixed steps at a desired level; of the chair, in an infinitely variably chosen position.
The alternatives B, C and D are adapted to be controlled by the user without tools, but the chair should also be available in an embodiment which must be controlled and adjusted by means of special tools, e.g. by a caretaker.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING
A method for the
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Cuomo Peter M.
White Rodney B.
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