Window lifter installation

Details Window lifter installation Window lifter installation

1979-04-23

1981-06-09

Witkowski, Stanley J.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318466, 318286, H02P 122

Patent

active

042727081

ABSTRACT:
This invention refers to a circuit arrangement for a motor for the purpose of driving a window in motor vehicles comprising a motor current supervising stage for switching the motor in case of blocking, wherein the motor current supervising stage responds to a change in time of the motor current. The dynamic supervising of the motor current offers a greater reliability than the known static supervising of the motor current. The circuit senses a rapid change in motor current to indicate that the window has met an undesired (e.g a human) obstacle.

REFERENCES:
patent: 3513374 (1970-05-01), Koment
patent: 3581174 (1971-05-01), Hammer
patent: 3624473 (1971-11-01), Robbins
patent: 3644811 (1972-02-01), Robbins
patent: 3675101 (1972-07-01), Robbins
patent: 3891909 (1975-06-01), Newson

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