Vehicle door locking system

Machine element or mechanism – Gearing – With brake means for gearing

Patent

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Details

74 50, E05B 6512, E05B 4700

Patent

active

048769096

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a motor vehicle door locking system which may be actuated either manually or by electrical power.
A door locking system of this type is disclosed in U.S. Pat. No. 3,243,216. In contrast to other known devices, the locking device of U.S. Pat. No. 3,243,216 has the advantage that in the end positions the driven element is completely decoupled from the driving motor so that the driven element can easily be adjusted by hand. A further advantage is that relatively little control is required with respect to the driving motor only rotating in one direction. However, this known system according to the U.S. Pat. No. 3,243,216 does not meet all requirements with regard to operational reliability. In case of failure the crank might stop outside its parkingn position so that then the lack actuating slide cannot be adjusted any longer. Especially in case of over-voltage and of a mechanism that can easily adjusted, the crank--in dependence of the moment of inertia of the rotating parts--can go beyond the area of the parking position after switching off the driving motor and it may even shift the slide into the opposite direction. So the effective stroke is reduced and the manual adjustment of the driven element is blocked. On the other hand, in case of under-voltage the adjusting force of the motor is often insufficient to produce the necessary actuating force for the slide and for the adjusting member actuated by the adjusting device respectively. In such a case the motor is blocked, whereby the crank is also stopped outside the normal parking position.
In the prior art the slide is coupled with the push rod via an overload spring which enables the push rod to be adjusted from one oend position to the other even then, when the adjusting movement of the slide is blocked. This requires, however, a considerable amount of power, for the overload spring must be constructed in such a way that it can transfer the adjusting force normally necessary for the driven element. In most cases the push rod is operatively connected with the door lock of the motor vehicle and as it is known by experience, in such a case the door lock cannot be unlocked any longer by key.
Therefore the object of the present invention is to improve an adjusting device of the first-mentioned kindn by simplest means as to operational reliability and function and to simplify the construction.
The present invention is based on the ideaa that the cases of failure mentioned above can efficiently be avoided, if, by means of a brake device, it is ensured that the crank is stopped in a predetermined parking position after each adjusting process. This can be realized in a simple way of construction by a mechanical brake device which is spring biassed with a predetermined brake force against a brake area of an element acting in combination with the driving motor. This brake devise is easily controlled by a brake actuating or releasing is integrally formed with the crank. thus the functional reliability of the adjusting device can essentially be improved by only two additional structual elements, namely by a brake block and a spring element. What matters thereby, is that the brake force is exactly pre-adjusted to a given value by a spring element and that it does not depend on other influencing factors, for instance, on the speed of rotation of the crank.
According to a particularly preferred development this brake device shall fulfill another function. It ensures that the driving motor can drive the crank from its parking position only if the drive motor can overcome the brake force. This assures that if the battery energizing the motor is low, the crank will not be moved through only a partial strokeif there is sufficient power to overcome the brake force, there is sufficient power to drive the crank through a full stroke.
An additional coupling makes sure that in every position of othe crank the slide can easily be adjusted after using a force for only a short time. Thereby a construction is preferred comprising an additional coupling that

REFERENCES:
patent: 3243216 (1966-03-01), Peters
patent: 4461501 (1984-07-01), Dumbser
patent: 4674781 (1987-06-01), Reece et al.
patent: 4685709 (1987-08-01), Kambic

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