Patent ID: 6351898
Filing Date: 2002-03-05
Classification: A46B,E01H

Abstract:
A height adjustment control system for a vehicle designed to remove unwanted materials from a road or a runway comprising:means for removing unwanted materials from a road or runway constructed and arranged to be mounted to the vehicle; means for moving said means for removing unwanted materials from a road or runway with respect to the surface of the road or the runway; an electrical signal to the means for moving said means for removing unwanted materials from a road or runway with respect to the surface of the road or the runway; a shaft having a first end, a second end and a central portion; said first end of said shaft connected to said means for removing unwanted materials from the road or the runway; a ratchet assembly threadably connected to said second end of said shaft; a threadable collar movably attached to said central portion of said shaft; a proximity sensor constructed and arranged to produce and monitor a magnetic field adjacent to said central portion of said shaft; whereby the position of said means for removing unwanted materials with respect to the surface of the road or the runway as caused by said means for moving may be set by the position of said ratchet assembly on said second end of said shaft; and whereby the movement of said shaft moves said threadable collar past said proximity sensor, thereby distorting said magnetic field, and stopping said electrical signal to said means for moving said means for removing unwanted materials from the road or the runway.