Elongate pressure actuated electrical switch
First Claim
1. An elongate pressure actuated electrical switch comprising a central elongate electric conductor;
- a flexible elongate element of electrically insulating material helically wound around the central conductor;
a flexible tubular body of electrically conductive material which is coaxial with and surrounds the central conductor;
at least one outer electric conductor in electrical contact with the outer surface of said flexible electrically conductive tubular body; and
an overall outer sheath of electrically insulating material, wherein the outer conductor is of elongate form and extends lengthwise alongside the flexible electrically conductive tubular body, the overall outer electrically insulating sheath has at least one substantially flat surface for supporting the elongate electrical switch on the ground and the elongate outer conductor is embedded in the overall outer sheath at a position intermediate of said substantially flat surface of the sheath and the central longitudinal axis of the central conductor.
1 Assignment
0 Petitions
Accused Products
Abstract
A rugged pressure actuated cable switch especially suitable for use in road vehicle detection comprises a central elongate conductor; a flexible insulating element helically wound around central conductor; a flexible tubular body of electrically conductive plastics material surrounding the central conductor; two elongate conductors in electrical contact with the outer surface of the flexible tubular body, and an overall insulating sheath of a transverse cross-section of approximately semi-circular shape having a flat surface for supporting the cable switch on the ground. Each outer conductor is embedded in the sheath alongside the flexible electrically conductive tubular body at a position intermediate of the flat surface and the longitudinal axis of the central conductor. When a pressure is applied to a part of the overall outer sheath remote from its flat surface, the central conductor is urged in a direction towards the flat surface to effect electrical contact with the two outer conductors via the flexible electrically conductive tubular body.
34 Citations
9 Claims
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1. An elongate pressure actuated electrical switch comprising a central elongate electric conductor;
- a flexible elongate element of electrically insulating material helically wound around the central conductor;
a flexible tubular body of electrically conductive material which is coaxial with and surrounds the central conductor;
at least one outer electric conductor in electrical contact with the outer surface of said flexible electrically conductive tubular body; and
an overall outer sheath of electrically insulating material, wherein the outer conductor is of elongate form and extends lengthwise alongside the flexible electrically conductive tubular body, the overall outer electrically insulating sheath has at least one substantially flat surface for supporting the elongate electrical switch on the ground and the elongate outer conductor is embedded in the overall outer sheath at a position intermediate of said substantially flat surface of the sheath and the central longitudinal axis of the central conductor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- a flexible elongate element of electrically insulating material helically wound around the central conductor;
Specification