Chairs and seats – Movable bottom – Interconnected with back for relative concurrent movement
Reexamination Certificate
2000-01-11
2001-10-16
Nelson, Jr., Milton (Department: 3636)
Chairs and seats
Movable bottom
Interconnected with back for relative concurrent movement
C297S353000, C297S339000
Reexamination Certificate
active
06302482
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a chair, more particularly for children and young persons, comprising a seat adapted to be adjusted in height and depth, a back rest arranged above the seat, a chair body adapted to be stood on the ground, on which at least one rack rail extending in the vertical direction is arranged and on which furthermore a holding means, associated with the seat, is adapted to run for adjustment in height, said holding means having a guide portion formed on it, a gear wheel arranged in a rotatable manner on the holding means, said gear wheel being in engagement with the rack rail, and drive means adapted to be caused to perform rotary movement by said gear wheel during vertical adjustment, said drive means being arranged on said holding means, said holding means constituting a seat holding part extending from its guide portion, on which holding portion a seat carrying part, connected with the seat is adapted to run in the direction of depth adjustment, said seat carrying part being drivingly connected with the drive means in such a manner that on resetting the holding means the seat is not only reset in height but automatically also in depth so that during its displacement upward or downward it simultaneously moves further forward or, respectively, rearward.
THE PRIOR ART.
In the case of a chair of this type described in the German patent publication 19,504,542 A1 the drive means are constituted by a drive pinion in mesh with a rack arranged on the seat carrying part so that rotation, occurring on displacement of the holding means in the height direction, of the drive pinion displaces the seat carrying part to the rear or to the front. In the case of this chair, the depth of the seat automatically adapts itself to the respective vertical position of the seat. This therefore renders the chair suitable for both children and also tall young persons and adults. In the case of a child the seat is lowered, it being simultaneously shifted to the rear so that the child may use the back rest. As the child grows he or she can use the seat after raising the seat, the seat being simultaneously so displaced forward that there is a comfortable sitting position leaning against the back rest.
In the case of the known chair the rack, and with it the seat carrying part, extends a comparatively great distance to the rear from the chair body. This leads to a bulky design, which impairs the appearance of the chair and involves the danger of injury to anyone moving past the chair and knocking against the rearwardly projecting rack rail.
SHORT SUMMARY OF THE INVENTION
One object of the invention is consequently to provide a chair of the type initially mentioned, in the case of which the resetting mechanism is designed in a compact manner.
In order to achieve these and/or other objects appearing from the present specification, claims and drawings, in the present invention the drive means is connected with the seat carrying part via flexible tension force transmitting means, as for instance a cord or a belt, to provide a driving connection, such driving means running on the holding means on the one hand free of slip around the drive means and on the other hand around direction changing means and comprise a section of the flexible tension force transmitting means extending along the seat holding part in the direction of depth adjustment, on which section of the flexible tension force transmitting means the seat carrying part is attached.
This means that the resetting of the seat carrying part is performed with the aid of flexible tension force transmitting means for instance a cable or the like. Such a flexible tension force transmitting means does not project to an unnecessary extent, since it may be redirected on either side of its section extending in the direction of the seat holding part.
A further advantage in comparison with the known rack is that the guide means seat carrying part does not have to be linear and may assume a curved path so that on resetting the position of the of the seat there is also a change in the slope of the seat.
The design in accordance with the invention is furthermore comparatively inexpensive.
The back rest is to be arranged at different distances above the seat for tall and short persons. Consequently in the case of known chairs the back rest has been designed to be adjusted in height. However frequently there is no possibility of such back rest adjustment, either because the designer forgot about it or because its use would be too inconvenient of the user.
In this connection there is a provision in accordance with a preferred embodiment of the novel chair such that the holding means is associated with the back rest as well, and forms a rest holding portion, which is borne by its guide portion, and is arranged above the seat holding portion, and on which a rest carrying part (which is connected the back rest) runs in a sliding manner in a vertical rest resetting direction, which carrying part which is drivingly connected with the drive or other drive means on the holding means (which during resetting of the height of the holding means is driven by the gear wheel or by another gear wheel on the holding means, which gear wheel is in engagement with the rack rail or another rack rail on the chair body) is driven via flexible tension transmitting means as for example a cord or a belt, which flexible tension force transmitting means are trained at the holding means on the one hand free of slip around the drive means or the other drive means and on the other hand are trained around further direction changing means and the flexible tension force transmitting means possess a section extending at the rest holding means in the direction of rest resetting in, on which section the rest carrying part is locked in such a manner that on displacement of the holding means upward or downward the vertical distance apart between the seat and the back rest becomes larger and, respectively, smaller.
This means that the vertical distance between the seat and the back rest is automatically reset, when the seat height is changed by displacement of the holding means. The back rest thus also takes part on the one hand in the displacement of the holding means with the seat in the height reset direction of the holding means and on the other hand is shifted in relation to the holding means so that with an increase in the height of the seat there will be a greater distance between the rest and the seat.
If the rest is provided with an gear wheel and/or another drive means, then by selection of suitable diameters the displacements performed on resetting the holding means, of the seat and of the rest in the depth direction and, respectively, in the vertical reset direction of the rest, may be separately set by the designer independently of one another. On the contrary in the case of equal reset displacements of the seat and of the rest there will be—ignoring a few exceptions—a seat design which is suitable for most persons so that both reset displacements may be controlled and driven by a single gear wheel and such movements may be driven by the same drive means, something which is particularly simple and economic.
Further advantageous developments of the invention are defined in the claims.
Convenient developments and forms of the invention will be understood from the following detailed descriptive disclosure of one embodiment thereof in conjunction with the accompanying drawings.
REFERENCES:
patent: 252169 (1882-01-01), Archer
patent: 2310366 (1943-02-01), Harman
patent: 5193880 (1993-03-01), Keusch et al.
patent: 5303982 (1994-04-01), Johnston
patent: 6095606 (2000-08-01), Opsvik
patent: 514 316 (1971-12-01), None
patent: 2 032 464 (1972-01-01), None
patent: 27 10 926 (1978-09-01), None
Looser Hans
Moll Hellmuth
Browdy and Neimark
Jr. Milton Nelson
Moll System-und Funktions-Möbel GmbH
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