Wiper assembly for vehicles

Claim 2

A wiper assembly for vehicles, having a wiper motor connected to a power source through automatic fixed position stopping contacts, which comprises a coupling mechanism having its driving side connected with the output shaft of said wiper motor and being of such character that the maximum transmitting torque thereof varies in proportion to the rate of rotAtion like that of a fluid coupling mechanism, a helical spring provided on the driven side of said coupling mechanism and wound up by the rotation of said wiper motor, a main contact provided on the driven side of said coupling mechanism and opened by the operation of said wiper motor, and a relay which is excited from the time when said main contact is closed, thereby to form a current supply circuit for said wiper motor and also a selfholding circuit, said current supply circuit for the wiper motor formed by said relay being connected in parallel with said automatic fixed position stopping contacts.

Claim 3

A wiper assembly for vehicles, having a wiper motor connected to a power source through automatic fixed position stopping contacts, which comprises a coupling mechanism having its driving side connected with the output shaft of said wiper motor and being of such character that the maximum transmitting torque thereof varies in proportion to the rate of rotation like that of a fluid coupling mechanism, a helical spring provided on the driven side of said coupling mechanism and wound up by the rotation of said wiper motor, a main contact provided on the driven side of said coupling mechanism and opened by the operation of said wiper motor, and a relay composed of a voltage coil which can be energized through a wiper switch when said main contact is closed, a normally-opened contact which is closed when said voltage coil is energized and a current coil which is connected in series with said normally-opened contact; the series circuit of said voltage coil of said relay and said main contact, the series circuit of said normally-opened contact and said current coil, and said automatic fixed position stopping contacts being connected in parallel.

Claim 4

A wiper assembly for vehicles, having a wiper motor connected to a power source through automatic fixed position stopping contacts, which comprises a coupling mechanism having its driving side connected with the output shaft of said wiper motor and being of such character that the maximum transmitting torque thereof varies in proportion to the rate of rotation like that of a fluid coupling mechanism, a helical spring provided on the driven side of said coupling mechanism and wound up by the rotation of said wiper motor, a main contact provided on the driven side of said coupling mechanism and opened by the operation of said wiper motor, and a relay composed of a voltage coil which can be energized through a wiper switch when said main contact is closed, a normally-opened contact which is closed when said voltage coil is energized and a current coil which is connected in series with said normally-opened contact; the series circuit of said voltage coil of said relay and said main contact, the series circuit of said normally-opened contact and said current coil, and said automatic fixed position stopping contacts being connected in parallel.

Claim 5

A wiper assembly for vehicles, having a permanent magnetic field-type wiper motor connected to a power source through automatic fixed position stopping contacts, which comprises a coupling mechanism having its driving side connected with the output shaft of said wiper motor and being of such character that the maximum transmitting torque thereof varies in proportion to the rate of rotation like that of a fluid coupling mechanism, a helical spring provided on the driven side of said coupling mechanism and wound up by the rotation of said wiper motor, a main contact provided on the driven side of said coupling mechanism and opened by the operation of said wiper motor, and a relay energized from the time when said main contact is closed, thereby to form a current supply circuit for said wiper motor and also a self-holding circuit, said current supply circuit for said wiper motor formed by said relay being connected in parallel with said automatic fixed position stopping contacts and further there being provided a dynamic braking circuit which is closed when said automatic fixed position stopping contacts are opened, to electrically short the opposite ends of said wiper motor, and said relay having a normally-closed contact for opening said dynamic braking circuit.

Claim 6

A wiper assembly for vehicles, having a permanent magnetic field-type wiper motor connected to a power source through automatic fixed position stopping contacts, which comprises a coupling mechanism having its driving side connected with the output shaft of said wiper motor and being of such character that the maximum transmitting torque thereof varies in proportion to the rate of rotation like that of a fluid coupling mechanism, a helical spring provided on the driven side of said coupling mechanism and wound up by the rotation of said wiper motor, a main contact provided on the driven side of said coupling mechanism and opened by the operation of said wiper motor, and a relay energized from the time when said main contact is closed, thereby to form a current supply circuit for said wiper motor and also a self-holding circuit, said current supply circuit for said wiper motor formed by said relay being connected in parallel with said automatic fixed position stopping contacts and further there being provided a dynamic braking circuit which is closed when said automatic fixed position stopping contacts are opened, to electrically short the opposite ends of said wiper motor, and said relay having a normally-closed contact for opening said dynamic braking circuit.