Patent ID: 6492604
Filing Date: 2002-12-10
Classification: H01H

Abstract:
A device for detecting passage of vehicle wheels over a roadway, comprising:a hollow rubber section having a low electrical resistance, mated with a U-shaped support which is partially closed along an upper part of the support, so that the hollow rubber section slightly projects from the U-shaped support; wherein the hollow rubber section includes a metal strip with insulation on a lower face of the strip, on sides of the strip, and on portions of the upper face of the strip; wherein the metal strip with the insulation is received in the hollow rubber section opposite an inner surface of the hollow rubber section; wherein the inner surface is separated from the metal strip by an air gap so that when unstressed, a high resistance is established between the strip and the hollow rubber section, and so that a low resistance is established between the strip and the hollow rubber section when a mechanical force is applied to an outer surface of the hollow rubber section; and wherein the hollow rubber section is formed of a deformable rubber so that the mechanical force deforms the hollow rubber section and produces the low resistance between the hollow rubber section and the metal strip, and so that the high resistance between the hollow rubber section and the metal strip is produced after the mechanical force is removed; and a transmission cable communicating with the device, wherein the transmission cable is a two-conductor cable having a first conductor which is mechanically connected to the metal strip and which is overmolded by an insulating rubber component, and a second conductor having an uninsulated portion which is embedded in an electrically slightly resistive rubber component, and a rubber component overmolded on an end of the device which is opposite to the transmission cable to close the device.