Vehicle window wiper with dual pause

Details Vehicle window wiper with dual pause Vehicle window wiper with dual pause

1988-07-21

1989-04-18

Ro, Bentsu

Electricity: motive power systems

Periodic, repetitious or successive operations control of...

1525017, 318DIG2, B60S 108

Patent

active

048230588

ABSTRACT:
A vehicle window wiper control activates an electric motor to drive the wiper through repeating cycles of a wipe pattern on a vehicle window. In the pause mode, a first wiper position responsive switch provides a pause at both inner and outer wipe positions, one at each end of the wipe pattern. In the off mode, however, the final wipe cycle is completed through a second wiper position responsive switch which is open only in the inner wipe position and is connected in parallel with the first wiper position responsive switch to shunt it at the outer wipe position, so that the wiper is parked only in the inner wipe position. The wiper position responsive switches are multiple stationary contacts tracing circular paths of differing radii on a conducting plate with non-conducting portions which rotates with wiper movement. The division of total pause time into two pauses per wipe cycle allows a halving of the RC time constant in the pause timer, with cost and/or reliability benefits.

REFERENCES:
patent: 4271381 (1981-06-01), Munz et al.
patent: 4336482 (1982-06-01), Goertler et al.
patent: 4559484 (1985-12-01), Hirano
patent: 4663575 (1987-05-01), Juzswik et al.

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