Movable or removable closures – With operator for movably mounted closure – Drive within closure housing
Patent
1990-04-25
1991-01-15
Kannan, Philip C.
Movable or removable closures
With operator for movably mounted closure
Drive within closure housing
474101, E05F 1148
Patent
active
049843869
ABSTRACT:
The invention concerns a tensioning device for the cable of a cable window lifter which is mounted in a drive bracket pulled up and down along a guide rail by means of a cable wound around an actuation drum. One cable end is solidly joined to the drive bracket whereas the other cable end is connected by a directional lock to the drive bracket. This directional lock compensates any cable elongation taking place within the cable actuation system by means of spring action. The tensioning device of the invention is characterized by providing further compensating means. This further compensation is needed in the event of excessive stresses exerted on the cable actuation system in the closed window position which results in a spurious cable elongation caused thereby. It also eliminates this compensation when this excess stress is no longer present. These further compensation means may consist of a spring additionally inserted between the free cable end and the directional lock; however they may also consist of a tippable and displaceable molded part inside the directional lock. The spring compensates the spurious cable elongation by relaxing before the actual compensation spring becomes effective. In the embodiments with the additionally inserted molded part, the compensation of the spurious elongation takes place by tipping the molded part which slips further by one step (cog) in the directional lock and only upon a real cable elongation.
REFERENCES:
patent: 4235046 (1980-11-01), Hess et al.
patent: 4657523 (1987-04-01), Chevance et al.
patent: 4753124 (1988-06-01), Chevance
patent: 4863417 (1989-09-01), Kimata et al.
patent: 4941286 (1990-07-01), Marscholl et al.
Marscholl Klaus
Medebach Thomas
Kannan Philip C.
Kuester & Co.
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