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US 4,235,046 AGranted
Window operating mechanism
AssigneeMetallwerk Max Brose GmbH & Co.
InventorsHans-Peter Hess, Wolfgang Schultheiss
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AssigneeMetallwerk Max Brose GmbH & Co.
InventorsHans-Peter Hess, Wolfgang Schultheiss
Estimating the term…
An operating mechanism for the window in a motorcar door and the like includes guiding devices, including at least one deflecting element, which engage a wire, cable or other elongated tension member and guide the tension member on the door in a loop-shaped path when the tension member is driven in the path alternatively in two opposite, longitudinal directions. The motion of the tension member is transmitted to the window. The tension member stretches under the longitudinal stresses exerted thereon by the drive and the window and needs to be tensioned. According to the invention, a spring in a permanently stressed condition biases the deflecting element in a direction to lengthen the path of the tension member and for thereby compensating for slack in the engaged portion of the tension member when the tension member moves in one longitudinal direction, whereby the spring reaches a partly relaxed condition. A protecting mechanism protects the spring against return from the partly relaxed condition toward the stressed condition when the tension member moves in the opposite direction.
In a motor vehicle window lifting mechanism including a cable drum, a cable wound about said drum, a Bowden cable sheath for guiding cable provided from said drum over a looped path, means for driving said drum so that said cable can be moved in either direction through said looped path, a drive member fixed to said cable for transmitting movement to a window to be operated, and a guide rail for guiding said drive member, the improvement comprising tensioning means for compensating for variations produced in the length of said cable when said cable is stressed, said tensioning means including a deflecting element which directly engages said cable and is mounted for movement relative to said sheath for applying compensating tension to said cable, and blocking means associated with said tensioning means for countering movement of said deflecting element in a direction in which tension applied to said cable by said tensioning means is released.
Dependencies are inferred from the claim text.