Movable or removable closures – With operator for movably mounted closure – Drive within closure housing
Patent
1996-01-24
1998-04-21
Dorner, Kenneth J.
Movable or removable closures
With operator for movably mounted closure
Drive within closure housing
E05F 1148
Patent
active
057406308
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention concerns a cable window-lift in particular for motor vehicles and comprising a drive for alternatingly winding and unwinding the cable running in at least one loop. the drive is divided into a cable lifting portion and a cable descending portion as regards the movement of the pane, further comprising a pane lifter displaceable up and down along a guide, one spring element and being present in the cable lifting portion and in the cable descending portion to compensate cable slackness.
2. Description of the Prior Art
Illustratively, such a cable-driven window lift is described in the German patent document A-1 33 25 837, which teaches a drive mechanism comprising a cable drum for alternatingly winding and unwinding a cable for instance held in the form of a loop. Starting from the drive with two outputs, the cable runs in each case in a cable sheath or hose to a deflection site between which, when the lift is in the assembled position, the cable runs in an essentially vertical direction parallel to a window-pane guide-rail holding a pane-lifter. The cable is linked to the lifter and as a result a corresponding lifter rotation entails alternating winding and unwinding of the cable on the drum and hence to lifting and lowering the pane. Each of the drive outputs is fitted with a compression spring resting between the drive housing and the end face of the particular cable sheath. These springs assure that any slack in the cable shall be eliminated from the overall system and accordingly the cable shall remain tensioned under all operational conditions at least in the region of the rails holding the lifter. The springs of the known window lifts are designed in such manner that their spring force is less than the force arising at the lifter and displacing the pane. Some play materializes in the known window lifts when drive rotation is reversed, and said play includes the displacement path of the springs. Before there is motion of the lifter, i.e. of the pane when there is reversal of the direction of pane displacement, first the previously relaxed spring will be compressed, while the other spring will be relaxed. However, such an arrangement is disadvantageous with respect to handling because the displacement path of the two compression springs is added to the inherent play of the drive, and consequently the pane will remain in its previous position when there is reversal of motion within an angle of rotation of 20.degree. to 40.degree..
The known window lift incurs another drawback in that when substantial forces are applied to the pane, the spring in the cable lifting portion is totally compressed and the pane may drop, namely by exactly the amount of said spring displacement. This displacement may be 5 to 6 mm and suffices to produce a small gap between the pane and the seal of the door frame. Clattering and undesired wind noises may arise as a result of such displacement.
OBJECT OF THE INVENTION
In the light of the above, the object of the invention is to improve a window lift of the initially cited kind making possible the raising and lowering of the window pane in substantially play-free manner and thereby to avoid clattering and wind noise. Additionally, for vehicle window-lifts driven by electric motors providing a short descending excursion of the pane, a reversed design of the compensating springs is recommended. Such short-excursion descents are used without additional pane guide-frames; in particular, in such vehicles as coupes, the pane in its closed position is pressed against a seal mounted in the vicinity of the vehicle roof. To avert excessive mechanical stresses on the seal, the pane initially is lowered a slight amount by the motor drive during opening and closing and then is displaced in controlled manner while the door is closed into the closed position, i.e. to rest against the roof-side seal. This short stroke of the pane moves by about 10 to 15 mm. If now on account of aging the cable should be slack, then the spring
REFERENCES:
patent: 4442632 (1984-04-01), Greco et al.
patent: 4657523 (1987-04-01), Chevance et al.
patent: 5505022 (1996-04-01), Shibata et al.
Dorner Kenneth J.
Kuster & Co. GmbH
Redman Jerry
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