AU427688B2 - Windscreen wiping systems for road vehicles - Google Patents

Description

S11.050pI This invention relates to windscreer wiing systems ror

road vehicles, of the kind including a wiper motor, a manually operable switch for controlling the motor, and a parking switch oparablein.synchronism with the motor and serving when the

manually operable switch is moved to its off position to complete a circuit to the viper motor until the wipers reach a parking

position.

The invention resides in a system of the kind specified incorporating also a washer motor which when operated causes

liquid to be supplied to the windscreen of a road vehicle, the washer motor being connected in the circuit in such a way that when a switch in series with the washer motor is closed, the circuit to the washer motor is completed each time the parking switch moves to its parking position.

The accompanying drawing is a circuit diagram illustrating one example of the invention.

Referring to the drawing, there are provided negative

and positive supply lines 11, 12 which in use are connected to the vehicle battery. Connected to the line 11 is one side of a permanent magnet windscreen wiper motor 13, the other side of which is connected to the movable contact 14 of a manually operable switch having an on position illustrated in which the contact 14 connects the motor 13 to the line 12, and an off position in which the contact 14 connects the motor 13 to a

further line 15. The line 15 is connected to the movable contact 16 of a parking switch which is operable by the motor 13, the arrangement being such that for the greater part of each cycle of operation of the motor 11.05 O0/7 £3 he contact 16 connects the line to the line 12, but once in each cycle at a point when the windscreen vipers are in a parking position, the contact 16 moves to its alternative position in which it connects the line to the line 11.

The arrangement thus far described is known, and in operation with the contact 14 in its on position, a circuit

is completed to a permanent magnet motor 13, which operates

the wipers. Movements of the contact 16 between its two

positions play no part in the operation of the circuit at

this stage. When-it is desired to stop wiping the windscreen

the contact 14 is moved to its off position, but assuming the

wipers are not in their parking position, a circuit is still completed to the motor 13 through the contacts 16 and 14. As soon as the vipers reach their parking position, the contact 16 moves to its alternative position, breaking the circuit to

motor 13, and at the same time short-circuiting the motor 13,

so that the vipers stop quickly.

In order to incorporate a windscreen washing system in

the system thus far described, all that is necessary is to connect a permanent magnet motor 21 in series with a manually operable switch 22 between the line 12 and the line 15. The motor 21 operates a pump for supplying cleansing liquid to the

windscreen, and the arrangement is such that when the windscreen

viper motor 13 is operating and the switch 22 is closed, the motor 21 will be energised each time the contact 16 moves to its

alternative position in which it connects the line 15 to the line 11. Thus, water will be supplied to the windscreen in squirts.-

11.05 0 synchronised with the movements of the (7 windscreen wipers. The extreme simplicity of the system compares very favourably with many other far more complicated arrangements which have been proposed in the past for incorporating automatic windscreen washers in a windscreen wiping system.

In a modification suitable for wound field wiper motor systems, the parking switch when closed, energises a relay the contact of which completes a circuit to the wiper motor. When the vipers reach their parking position, the parking switch opens, the relay is de-energised and the relay contact moves to its alternative position, completIng a circuit through an on-off switch to the washer motor.

Rt05 0pM The claims defining the invention ate as follows:-

1. A windscreen wiping -system of the kind specified including also a washer motor which when operated causes liquid to be supplied to the windscreen of a road vehicle, the washer motor being connected in the circuit in such a way that when a switch in series with the washer motor is closed, the circuit to the washer motor Is completed each time the parking switch moves to its parking position.'

2. A windscreen wiping system comprising the combination and arrangement of parts substantially as described with reference to the accompanying drawing.

DATED this 3rd day of February 1970.

JOSEI'H LUCAS (IN~DUSTRES) LIMITED. By their Patent Attamey:

of GRIFFITH, HA&.EL FRAZER.

4276 88

11.050/70

11.05 OR~O