Headlamp levelling system
First Claim
1. A headlamp levelling system for a road vehicle, comprising a two terminal d.c. electric motor operable to drive a linearly movable member coupled to a headlamp for adjusting the headlamp in a manner to vary the direction of the light beam emitted by the headlamp;
- an electrical supply across the terminals of which the motor is connected by way of an electrical circuit including a plurality of spaced pairs of fixed electrical contacts and first and second switch means operated by a common operating member; and
a rotatably mounted conductive bridging member associated with said pairs of fixed electrical contacts, the conductive bridging member undergoing rotational movement relative to said pairs of fixed electrical contacts in response to linear movement of said driven member so that, in each of a plurality of discrete positions of the driven member and hence said headlamp, the bridging member electrically connects all but a respective pair of said fixed contacts;
the first switch means including a plurality of normally open switches, one for each of said pairs of contacts, and being movable between a plurality of switch positions in each of which one of said normally open switches is closed to supply current to the motor to move said driven member until it reaches the discrete position in which the pair of contacts associated with said closed switch are not electrically connected by the bridging member, whereupon the supply of current to the motor is terminated; and
said second switch means being operable to reverse the connections between the motor and the terminals of the electrical supply when the first switch means is moved from one switch position to a further switch position after its preceding movement had been from said further position to said one position.
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Accused Products
Abstract
A headlamp levelling system for a road vehicle, comprises an electric motor which, in use, drives a member coupled to the headlamp so as to allow the headlamp to be adjusted in a manner to vary the direction of the light beam emitted, in use, by the headlamp. The motor is connected across the terminals of an electrical supply by way of an electrical circuit including switch means and a plurality of spaced pairs of electrical contacts. The switch means has a plurality of switch positions, one for each of said pairs of contacts, and a bridging member is associated with said pairs of contacts. The contacts and the briding member undergo relative movement in response to movement of said driven member so that the bridging member bridges said pairs of contacts, in turn, in respective discrete positions of the driven member and hence of said headlamp. The electrical circuit is arranged so that when said switch means is moved from one switch position to a further switch position, current is fed from said supply to said motor to move said driven member until said bridging member bridges the pair of contacts associated with said further switch position, whereupon the supply of current to the motor is terminated.
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Citations
8 Claims
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1. A headlamp levelling system for a road vehicle, comprising a two terminal d.c. electric motor operable to drive a linearly movable member coupled to a headlamp for adjusting the headlamp in a manner to vary the direction of the light beam emitted by the headlamp;
- an electrical supply across the terminals of which the motor is connected by way of an electrical circuit including a plurality of spaced pairs of fixed electrical contacts and first and second switch means operated by a common operating member; and
a rotatably mounted conductive bridging member associated with said pairs of fixed electrical contacts, the conductive bridging member undergoing rotational movement relative to said pairs of fixed electrical contacts in response to linear movement of said driven member so that, in each of a plurality of discrete positions of the driven member and hence said headlamp, the bridging member electrically connects all but a respective pair of said fixed contacts;
the first switch means including a plurality of normally open switches, one for each of said pairs of contacts, and being movable between a plurality of switch positions in each of which one of said normally open switches is closed to supply current to the motor to move said driven member until it reaches the discrete position in which the pair of contacts associated with said closed switch are not electrically connected by the bridging member, whereupon the supply of current to the motor is terminated; and
said second switch means being operable to reverse the connections between the motor and the terminals of the electrical supply when the first switch means is moved from one switch position to a further switch position after its preceding movement had been from said further position to said one position. - View Dependent Claims (2, 3, 4, 5, 6)
- an electrical supply across the terminals of which the motor is connected by way of an electrical circuit including a plurality of spaced pairs of fixed electrical contacts and first and second switch means operated by a common operating member; and
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7. A headlamp levelling system for a road vehicle, comprising a two terminal d.c. electric motor operable to drive a linearly movable member coupled to a headlamp for adjusting the headlamp in a manner to vary the direction of the light beam emitted by the headlamp;
- an electrical supply across the terminals of which the motor is connected by way of an electrical circuit including switch means and a plurality of spaced pairs of fixed electrical contacts; and
a rotatably mounted conductive bridging member associated with said pairs of contacts, the bridging member undergoing rotational movement relative to said contacts in response to linear movement of said driven member so that, in each of a plurality of discrete positions of the driven member and hence the headlamp, the bridging member electrically connects a single, different pair of said electrical contacts;
said switch means including a plurality of normally closed switches, one for each of said pairs of contacts, and being movable between a plurality of switch positions in each of which one of said normally closed switches is open so that when the switch means is moved to open one of said switches, current can flow to the motor to move the driven member until the bridging member electrically connects the pair of contacts associated with said open switch, whereupon the supply of current is terminated. - View Dependent Claims (8)
- an electrical supply across the terminals of which the motor is connected by way of an electrical circuit including switch means and a plurality of spaced pairs of fixed electrical contacts; and
Specification