Apparatus for elimination play in gear wheel transmissions

Chairs and seats – Movable back – Tiltable

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Details

74440, 74804, A47C 1025

Patent

active

044075448

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

This invention relates to apparatus for eliminating play between two interengaged gear wheels of a gear wheel transmission which is self-locking in relation to a moment of rotation acting on the output side. Apparatuses of this kind can be used in particular in eccentric transmission systems in hinge fittings of motor vehicle seats with an adjustable backrest, but they can also be used in drafting machines and in other applications.
Eccentric transmission systems are known from DE No. 2 734 568A. They are used in many situations. In many cases it is desirable to eliminate the play which is present in known eccentric transmission systems.
Previously known apparatuses for eliminating the play between interengaging gear wheels of a gear wheel transmission are expensive and are therefore unsuitable for many purposes, for example for use in a gear wheel transmission system for adjusting the inclination of the backrest of a motor vehicle seat.


SUMMARY OF THE INVENTION

It is an object of the invention to eliminate the play in a gear wheel transmission by simple means which can be comparatively simple produced in a compact design, and can thus be used in many cases in which the previously known apparatuses cannot be employed.
According to the present invention there is provided apparatus for eliminating play between two interengaged gear wheels of a gear wheel transmission which is self-locking in relation to a moment of rotation acting on the output side, characterised by the combination of the following features:
(a) the central axis of one disc-like transmission element is concentric with respect to the axis of rotation of one gear wheel;
(b) the spacing of the axes of rotation of the two gear wheels is a function of the rotation of the disc-like transmission elements relative to each other;
(c) a spring is connected to both disc-like transmission elements in such a way that the two disc-like transmission elements are pivoted relative to each other by the spring force in a direction, such that the displacement of the central axes of the disc-like transmission elements relative to each other in radial direction increases and thus play between the gear wheels, which are connected to the disc-like transmission elements, is removed; and
(d) a handle is connected to a gear wheel by way of an adjusting shaft and the disc-like transmission elements in such a way that, upon rotary movement in either of the two directions of rotation, said gear wheel is rotated relative to the other gear wheel and at the same time a disc-like transmission element is moved in the direction of slightly increasing the play between the two gear wheels.
This arrangement ensures that, in the event of possible incipient jamming of the gear wheels, by taking advantage of the friction between parts which are moved, a small amount of play can be produced between the gear wheels and thus any jamming can be avoided.
In many cases it is advantageous to employ in embodiment of the invention in which the disc-like transmission elements are in the form of two single eccentrics which are arranged movably relative to each other and which are arranged as a double eccentric, means are provided which cause the spacing of the axes of rotation of the two gear wheels to be a function of the respective resulting eccentricity of the double eccentric, and the force of the spring element causes the two eccentrics to be pivoted relative to each other in such a direction that the total eccentricity increases and thus the play between the gear wheels, which are connected to the two eccentrics, is removed. However, to simplify production, it may be useful not to provide a double eccentric but to employ an embodiment in which the disc-like transmission elements are in the form of a first guide disc which is displaceable on the adjusting shaft, which shaft is concentric with respect to the central axis of the one gear wheel, in a radial direction relative to said adjusting shaft, and a second guide disc which is connected to the first gui

REFERENCES:
patent: 4025109 (1977-05-01), Klingelhofer et al.
patent: 4227741 (1980-10-01), Gross et al.

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