Donald H Nelson

US Patent:

41012356, Jul 18, 1978

Filed:

Jun 27, 1977

Appl. No.:

5/810174

Inventors:

Donald F. Nelson - Van Nuys CA

International Classification:

E01F 1300

US Classification:

404 6

Abstract:

An improved parking lot traffic control means comprising an elongate series of tire engaging spikes extending transverse an entering and exit lane; said spikes are carried by an elongate shaft rotatably supported below the surface of the lane to project upwardly therefrom and from the surface of the lane when the shaft is in a normal rotative position; drive means including a reversible electric motor is provided to rotate the shaft to an actuated rotative position where said spikes project horizontally and below the surface of the lane; control means is provided to operate the drive means and includes manually operable actuating switch means at one end of the lane to cause the motor to rotate the shaft from its normal to its actuated position and automobile operated actuating switch means at the other end of the lane to cause the motor to rotate the shaft from its actuated to its normal position.