United States Patent Number 5,264,997

United States Patent 5,264,997
United States Patent 5,264,997
Hutchisson, et. al.Nov. 23, 1993

Sealed, inductively powered lamp assembly

Inventors: Hutchisson; James T. (Bellevue, WA); Anderson; Craig A. (Seattle, WA).
Assignee: Dominion Automotive Industries Corp. (Kent, WA).
Appl. No.: 846,200
Filed: Mar. 4, 1992
Intl. Cl.:F21V 23/02
U.S. Cl.:362/226; 362/265; 362/458; 313/493; 315/276; 315/283; 439/ 11
Current U.S. Class:362/226
Field of Search:

References Cited

U.S. Patent Documents
1,533,613Apr., 1925Rubin 439/ 11
2,462,336Feb., 1949Ruff 315/283
3,909,670Sept., 1975Wakamatsu et al. 315/276
3,980,921Sept., 1976Izawa 315/283
4,176,310Nov., 1979Elenga et al. 315/283
4,852,648Aug., 1989Akkerman et al. 439/ 11
4,977,354Dec., 1990Bergervoet et al. 315/248
5,034,658Jul., 1991Hiering et al. 315/248

Primary Examiner: Cole; Richard R.
Attorney, Agent or Firm: Christensen, O'Connor, Johnson & Kindness


A lamp assembly (10) for use with equipment such as construction vehicles and heavy trucks that are subjected to prolonged, intense vibrations. The lamp assembly of this invention includes a socket (14) formed by a shell (42). A sealed enclosure, in the form of a lamp housing (12), is releasably secured in the shell. The light source, such as a gas-discharge tube (16) or a set of LEDs (72) is located inside the lamp housing. A transformer primary winding (20), which is attached to a power source (56), is attached to the outside of the shell. A transformer secondary winding (22) connected across the light source is located inside the lamp housing. The secondary winding is located so that the lamp housing is seated in the socket, adjacent the primary winding. When a voltage is applied across the primary winding, an inductive voltage develops across the secondary winding. The voltage developed across the secondary winding is applied to the light source, which results in its energization and the emission of light thereby.

31 Claims, 6 Drawing Figures

For more information on this patent, contact Craig Anderson -- craig@the4cs.com
For more information on patents in general, visit the United States Patent and Trademark Office

Return to Craig's Home Page