Chairs and seats – Back movement resiliently opposed in operating position – Back and seat adjust simultaneously
Patent
1994-12-12
1996-12-17
Cuomo, Peter M.
Chairs and seats
Back movement resiliently opposed in operating position
Back and seat adjust simultaneously
2973006, 2973005, 2973004, A47C 3025
Patent
active
055845339
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to a seat arrangement with a seat pivotable around a horizontal pivot axis in its front region and with variable inclination and with a backrest whose inclination can be changed compulsorily more than proportionally (super proportionally) in relationship to or as a function of the inclination change of the seat; herein the seat is pivotally connected to rocking levers. The rocking levers support the backrest with their respective ends. The respective ends of the rocking levers, opposite to the respective backrest supporting ends, are pivotally attached to the bearing block of the seat frame, wherein the rocking levers are articulated at the seat with spacing from the rear end of said seat; herein the segments of the rocking levers rotatably supported at the bearing block and the segments of the rocking levers adjacent to the articulation axis of the seat form an obtuse angle with the base; a return spring is also provided for automatic return of the seat surface and backrest from the neutral position into the working position when the load is removed.
Such seating facilities, in particular swiveling office chairs or professional work chairs of other types, are known in many embodiment forms, whereas one respectively always strives to achieve a synchronous movement of the seating surface and the backrest when pivoting the seat from the working position with a substantially horizontal seating surface and vertical backrest into the position of rest or the neutral position, for which purpose appropriate synchronization arrangements, for instance in the form of rocking levers are used. Herein the synchronization arrangement is laid out in such a way, that, when the seating surface is pivoted, a more than proportional (super proportional) pivoting of the backrest occurs, in order to attain a ergonomically favorable position of rest and to avoid the so-called "effect of removing one's shirt".
A seat of the generic type is known from the DE 39 16 474-A1. In this known seating chair the pivoting from the working position into the neutral position occurs by displacement of the weight of the user against a restoring or return device, which for instance is formed by a spring. Herein during the lowering motion the pivot axis of the seat at the bearing block is simultaneously guided to be falling-off in the rearward direction, for which purpose suitable elongated hole guides are provided in the bearing block.
In the first place it is disadvantageous in this known seat, that the displaceability of the pivot axis of the seat in the front region of the chair requires a relatively complicated or expensive design configuration, which requires a correspondingly space-consuming enclosure, which impairs the visual aspect of the chair. In the second place it is a considerable disadvantage, that the restoring or return-arrangement cannot be adapted to different weights of the user of the chair.
Basically it is for instance known from the DE 39 30 983-A1 to use a restoring arrangement consisting of at least one spherical spring effective in the pivoting mechanism. In this known seating arrangement, an arrangement for varying the prestress is provided for adaptation to different user weights and thus for adjustment of differing return or restoring forces.
An adjustment of the restoring device can be achieved indeed by this variation of the spring prestress, however it was seen that when the spring prestress is varied only an inadequate adjustment range within the limit ranges (for users with low or high body weights) is achieved. In addition either a very large adjustment travel or a considerable expenditure of force is required in the limit regions, which complicates the handling.
Therefore it is the task of the invention to create a solution where the handling of the restoring device is considerably improved and an adjustment with a low expenditure of force is made possible in a simple manner also in the limit regions, while at the same time providing as simple a design layout as possible and a small con
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Cuomo Peter M.
Mauser Waldeck AG
White Rodney B.
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