Device for relative angular setting of two units, preferably the

Details Device for relative angular setting of two units, preferably the Device for relative angular setting of two units, preferably the

1993-12-20

1995-10-31

Wright, Dirk

Planetary gear transmission systems or components

Planetary gearing or element

Coaxial teeth around planet pinion engage axially spaced...

475347, 297362, B60N 222

Patent

active

054624983

DESCRIPTION:

BRIEF SUMMARY
The subject invention concerns a device for relative angular setting of two units, preferably the inclination of the back rest of a seat, and particularly a vehicle seat, comprising components that are interconnected in pairs for mutual rotational movement, said components preferably being separate fitting components which are arranged to be be associated with the back rest and the seat face, respectively, of the vehicle seat.
The main purpose of the invention is to provide a constructionally simple and reliable adjustment device for continuous, i.e. stepless, setting of the inclination of the back rest.
This purpose is achieved by means of a device in accordance with the invention which is essentially characterized in that each component of said pair of integrated seat components is formed with a gear rim, each with a different number of teeth, said rims being positioned adjacent one another in mutual concentric relationship, with the rim teeth meshing wtih a number of planet wheel pairs, wherein each pair comprises two planet wheels, said wheels likewise being positioned adjacent one another in mutual concentric relationship and being non-rotationally interconnected, whereby the rolling of the planet wheel/wheels in mesh with the associated gear rim causes the two gear rims and the associated components of the joint to turn with respect to one another and consequently the back rest of the vehicle seat to pivot with respect to the seat face.
In accordance with a preferred embodiment, the device comprises at least two pairs of planet wheels which are supported by a common support member, and an actuator arranged to move the planet wheels along their respective gear rim.
Preferably, the actuator is a hand wheel which is non-rotationally connected to the planet-wheel support member.
In accordance with a suitable development the planet wheels also mesh with a central sun wheel which is drivingly connected with an actuator, the latter preferably being a hand wheel.
Preferably, the actuators associated with the planet wheel support members and with the sun wheel, respectively, may be made as two coaxial hand wheels, the one connected with the sun wheel preferably being of smaller-diameter size with respect to and located externally of, the hand wheel connected with the planet wheel support member. In this manner, the two hand wheel could be manipulated in a convenient manner optionally by one hand, depending on whether rough or fine adjustment of the back rest position is desired.
The actuator could also be an electric motor and in accordance with one alternative embodiment, the motor could mesh with a gear rim which is non-rotationally connected with the planet wheel support member. It should be understood that in accordance with the embodiments mentioned previously and including sun wheels, the latter could with advantage be driven by an electric motor.
Preferably, all planet wheels have the same number of teeth and the toothed wheels of the same pair have a different cog tooth module whereas the cog tooth module of the two gear rims corresponds to the module of the planet wheel meshingly cooperating therewith while on the other hand they have a mutually different number of teeth.
Preferably, the two components of the joint as well as the planetary wheel support member are configured as disk-shaped members in abutting relationship, with the planet wheel support member forming a cap covering the individual gear tracks. In this manner it becomes possible to provide a construction that is very thin and which in addition is well protected from external impurities that may cause mal-functioning of the device.
Some embodiments of the invention will be described in the following in closer detail with reference to the accompanying drawings, wherein
FIG. 1 is a sectional view through a fitting of a joint in accordance with the invention, and
FIG. 2 is a sectional view along line II--II of FIG. 1 through the same fitting,
FIG. 3 is a sectional view with the section taken at different levels, through a fitting of a join

REFERENCES:
patent: 3792629 (1974-02-01), Applebury
patent: 4211451 (1980-07-01), Shephard
patent: 4345792 (1982-08-01), Shephard
patent: 4882943 (1989-11-01), Pipon et al.
patent: 5098359 (1992-03-01), Chales et al.
patent: 5127286 (1992-07-01), Wittig

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