Drive device for adjusting a device between terminal positions

Details Drive device for adjusting a device between terminal positions Drive device for adjusting a device between terminal positions

2000-10-23

2001-11-20

Ip, Paul (Department: 2837)

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

C318S444000, C318S445000, C318SDIG002

Reexamination Certificate

active

06320340

ABSTRACT:

PRIOR ART
The invention is based on a drive device for adjusting a device used in a vehicle between terminal positions.
From German Patent DE 197 12 185 C1, a drive device is known for a part of a vehicle that can be adjusted between terminal positions, especially for a roof panel of a vehicle roof, having an electric motor that is connected via a first step-down gear to a pinion seated on a shaft. The pinion is drivingly connected to the adjustable part. A switch device controls the electric motor, for stopping the electric motor in at least one predetermined position of the adjustable part. A second step-down gear has a rotatable power takeoff element, and a switch body, connected to the power takeoff element, for actuating the switch device, wherein the switch body has at least one north pole and one south pole. The switch device includes a magnetic-field-sensitive sensor that is disposed on a conductor track board of the switch device. To that end, the conductor track board extends to beyond the path of motion of the switch body. In viewing the drawings of DE 197 12 185 C1, the conductor track board, in the region of the magnetic-field-sensitive sensor, has an extension that protrudes for instance from an otherwise rectangular outline of the conductor track board. It can be appreciated that this extension makes for conductor track board waste and thus entails expenses for wasted material and expenses for disposing of the wasted material.
The second gear of this drive device is embodied in the manner of an eccentric gear-wheel system. The power takeoff element is embodied as a gear wheel with teeth on the inside that is supported such that the gear wheel can be rotated concentrically with the shaft of the first step-down gear. Instead of this kind of eccentric gear wheel system, a spur wheel gear with a power takeoff shaft or a worm gear in accordance with German Patent 1 024 373 can naturally be used. In the exemplary embodiment of the German patent, the worm wheel serves as the power takeoff element, and the switch body is embodied as a pin and is secured radially to the worm wheel. The pin actuates electrical contacts.
ADVANTAGES OF THE INVENTION
The drive device has an advantage that a rectangular outline, for instance, can be selected for the conductor track board. To produce this kind of rectangularly bounded conductor track board, all that has to be done, in a technologically simple way, is to cut a platelike starting material apart lengthwise and crosswise. In the production of the magnetic flux guide body, the starting material can be a rod material or a wire material, so that the only waste produced is at the end of rods or wire coils. Metal wire or rod material waste can be re-melted and thus re-used.
The definitive characteristics set forth herein have the advantage that the switch body can be magnetized in a technologically simple way, and furthermore, magnetic flux originating at the switch body can be concentrated readily on the magnetic-field-sensitive sensor.


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