Anti-skid Devices Patents (Class 152/208)
  • Patent number: 3934632
    Abstract: A device for inserting or moulding into a tire tread to increase traction and stabilize the tread comprising an elongated body having an end surface and installed in the tire so that the end surface is spaced inwardly of the tread surface in a manner defining a recess. As the tire moves along a supporting surface such as a road, the portion containing the device is brought into and out of maximum stress thereby varying the volume of the recess in a manner creating suction therein which increases traction between the tire and road. The device is formed of material having wear characteristics substantially similar to the tire material, for example thermosetting plastic material which preferably is filled with iron powder. The device has a frusto-conical body terminating in the end surface and having a relatively larger diameter base portion at the opposite end for proper securement in the tire.
    Type: Grant
    Filed: April 15, 1974
    Date of Patent: January 27, 1976
    Inventors: Thomas G. Kalpin, Howard J. Ross