US 4,309,646 AGranted

Control arrangement for windshield wiper apparatus

AssigneeITT Industries, Inc.

InventorsKarl-Heinz Liedtke, Horst Rachner

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Abstract

In a windshield wiper system of the type using a reversible electric motor, and controlled by a reversing switch, at least one of the reversing points is variable in dependence on the switching position of an operating switch. The range of angular rotation of the motor armature is thereby increased when the operating switch is moved to the "off" position to in turn assure that the wiper blades will be moved to a concealed parking position.

Claims3

Dependent claims

Windshield wiper apparatus comprising:

a voltage source;
a reversible wiper motor means adapted to drive a drive shaft means for oscillating a windshield wiper;
reversing switch means for coupling said motor to said voltage source, said switch means having first and second conductive states and being responsive to first and second control signals for switching between said first and second conductive states, said reversing switch means in said first conductive state coupling said motor to said voltage source such that said drive shaft means rotates in a first direction, said reversing switch means in said second conductive state coupling said motor to said voltage source such that said drive shaft means rotates in a second direction;
control means for generating said control signals such that said reversing switch means is switched to said first conductive state when said drive shaft means is at a first angular position and is switched to said second conductive state when said drive shaft means is at a selected one of two second angular positions and;
said control means comprising:
operating switch means having a plurality of operating switch positions for determining a corresponding plurality of modes of operation of said apparatus, means for selecting one of a plurality of modes of operations of said apparatus;
first position means for generating a first indicating signal when said drive shaft is at a first anglar position;
second position means for generating a second indicating signal when said drive shaft is at a first one of said two second angular positions;
third position means for generating a third indicating signal when said drive shaft is at a second one of said two second angular positions;
first store means for storing a first signal indicating that said selecting means has selected a first one of said plurality of modes of operations and for coupling said voltage source to said switch means when said first signal is stored;
a reversing store means for storing a first control signal each time said first position means generates said first indicating signal, and for storing a second control signal when said second position means generates said second indicating signal and said selecting means is selecting said first mode of operation or when said third position means generates said third indicating signal and said selecting means is selecting a second one of said plurality of modes of operation, and for supplying said first or second stored control signal to said reversing switch means.

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Dependencies are inferred from the claim text.

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Abstract

Windshield wiper apparatus comprising:

a voltage source;
a reversible wiper motor means adapted to drive a drive shaft means for oscillating a windshield wiper;
reversing switch means for coupling said motor to said voltage source, said switch means having first and second conductive states and being responsive to first and second control signals for switching between said first and second conductive states, said reversing switch means in said first conductive state coupling said motor to said voltage source such that said drive shaft means rotates in a first direction, said reversing switch means in said second conductive state coupling said motor to said voltage source such that said drive shaft means rotates in a second direction;
control means for generating said control signals such that said reversing switch means is switched to said first conductive state when said drive shaft means is at a first angular position and is switched to said second conductive state when said drive shaft means is at a selected one of two second angular positions and;
said control means comprising:
operating switch means having a plurality of operating switch positions for determining a corresponding plurality of modes of operation of said apparatus, means for selecting one of a plurality of modes of operations of said apparatus;
first position means for generating a first indicating signal when said drive shaft is at a first anglar position;
second position means for generating a second indicating signal when said drive shaft is at a first one of said two second angular positions;
third position means for generating a third indicating signal when said drive shaft is at a second one of said two second angular positions;
first store means for storing a first signal indicating that said selecting means has selected a first one of said plurality of modes of operations and for coupling said voltage source to said switch means when said first signal is stored;
a reversing store means for storing a first control signal each time said first position means generates said first indicating signal, and for storing a second control signal when said second position means generates said second indicating signal and said selecting means is selecting said first mode of operation or when said third position means generates said third indicating signal and said selecting means is selecting a second one of said plurality of modes of operation, and for supplying said first or second stored control signal to said reversing switch means.

8 more elements