Gregory Alan Cheatham

US Patent:

50034413, Mar 26, 1991

Filed:

Jun 30, 1989

Appl. No.:

7/374526

Inventors:

John R. Crowe - Solana Beach CA
Gregory A. Cheatham - Oceanside CA

International Classification:

F21L 700

US Classification:

362183

Abstract:

A terrain light fixture has a hollow body that is normally sunk within the ground, and a movable member disposed to telescope between a position retracted within the body and substantially flush with the ground surface and a position extended above the ground surface. The moveable member carries a light source, typically a 12 v. d. c. high intensity light bulb, that is energized in the extended position of the moveable member. The motive force to move the member is provided by an electrical lift mechanism, preferably either an electric motor or a shape-memory alloy. The motor-based lift mechanism operates equivalently to the power antenna of an automobile. The shape-memory alloy is typically configured as a spring. The application of electrical energization to both the light source and to the lift mechanism is preferably enabled by a switch that is responsive to sensed ambient light conditions. The energizing power may be external, or may be provided by an internal battery which is rechargeable from a solar array.