Chair, in particular work or office chair

Details Chair, in particular work or office chair Chair, in particular work or office chair

1990-08-20

1992-03-31

Aschenbrenner, Peter A.

Chairs and seats

Back movement resiliently opposed in operating position

Back secured to resilient upright bar or rod

297353, 297354, A47C 300

Patent

active

051002000

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
This invention relates to a chair, in particular a work or office chair, with a backrest frame, the tilt of which can be adjusted relative to the seat and with a backrest support member, displaceable thereon by means of a slider or the like, where, when tilting back, the slider is slidable in or on the backrest frame in the direction of the seat by means of a displacement device.
2. Description of Prior Art
Known chairs of this type offer excellent seating comfort because they result in a definite support of the back of the user in the initial or working position, because of the practically vertical position of the backrest and they permit relaxed sitting when the backrest frame is tilted back. When the backrest frame is tilted back, the upper torso of the user does not simply perform a pivot movement, but there is a movement in which several components are superimposed on each other. Because the backrest performs an additional downward movement when the backrest frame is tilted back, relative movement between the back of the user and the backrest is avoided or at least reduced to the point where it is no longer noticeable.
These known chairs have the disadvantage that in the steep initial position the backrest assumes a defined position relative to the seat, which is adapted to the size of the body of the user. Because the backrest has an anatomically adapted shape, optimum seating comfort can only be achieved by a user with an average body size.


SUMMARY OF THE INVENTION

It is the object of the invention to achieve in a chair of the type mentioned above that, besides the compensation of the relative movement between the body of the user and the backrest during tilting back of the backrest rod, there is the additional possibility for bringing the backrest into an initial position which is adapted to the body size of the user.
In accordance with the invention this object is attained in that the backrest is connected with a cradle or the like, which is additionally displaceable over a pre-determined displacement path and fixable in several positions in or on the slider.
By means of the backrest support member or the like, which is displaceable with respect to the slider or the like, without affecting the displacement path of the slider or the like, which takes place automatically via the displacement device, the backrest with the backrest support member or the like can be brought into an initial position, which is adapted to the body size of the user, over a separate displacement path. In this way the anatomical design of the backrest takes full effect for every user regardless of the body size, which is also accomplished with relatively minimal additional effort.
Setting of the backrest support member into several definite positions on its displacement path in or on the slider is accomplished in a simple manner in that a spring with a lock bolt is disposed on the cradle which can engage one or a plurality of bores of the slider. The spring can be disengaged and in this way the locked connection between the lock bolt and the slider can be interrupted with a key disposed in the backrest frame.
After the key has been released, the lock position between the lock bolt and the slider is automatically assumed if the key is fixed on the slider with an elastic element serving as a restoring spring and, by means of extensions, is brought behind the spring in the highest position of the backrest, and thus of the backrest support member.
In a particularly advantageous embodiment of this invention the spring is in the form of a U-shaped leaf spring which laterally encloses the backrest support member with its lateral arms and is supported by its cross arm on the side of the backrest support member facing the seat on the side of the slider facing the backrest. The key is disposed on the side of the backrest, frame facing away from the backrest outside of the displacement path of the backrest. The key is thus always easily accessible and the spring with the lock bo

REFERENCES:
patent: 2992855 (1961-07-01), Mohler
patent: 4452486 (1984-06-01), Zapf et al.
patent: 4456298 (1984-06-01), Gottstein
patent: 4502729 (1985-03-01), Locher
patent: 4536031 (1985-08-01), Latone
patent: 4632458 (1986-12-01), Brown et al.
patent: 4697846 (1987-10-01), Lucci et al.
patent: 4786108 (1988-11-01), Dauphin

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