[54] HEAT SINK AND PROCESS OF MANUFACTURE
[76] Inventors: Ronald D. Bargman, 31821 Carlelder, Beverly Hills, Mich. 48025; Ioslav Umanskly, 29356 Breezewood, Farmington Hills, Mich. 48331
[21] Appl. No.: 09/182,730 [22] Filed: Oct. 29, 1998
Related U.S. Application Data
[60] Provisional application No. 60/063,718, Oct. 29, 1997.
[51] Int. C I. 1281 7/00
[52] U.S. CI 29/890.03; 165/80.3; 165/185;
361/704; 176/16.3
[58] Field of Search 165/80.3, 185;
29/890.03, 890.045, 890.053, 505, 509,
557, 558
[56] References Cited
U.S. PATENT DOCUMENTS
3,763,681 10/1973 Flintoft 29/890.03
4,733,453 3/1988 Jacoby 29/890.03
5,052,481 10/1991 Horvath et al 165/185
5,351,748 10/1994 Dagan 165/80.3
5,369,301 11/1994 Hayashi et al. .
5,421,406 6/1995 Furasawa et al 165/185
5,447,189 9/1995 Mclntyre 165/185
5,519,938 5/1996 Kojima et al 29/890.03
5,533,257 7/1996 Romero et al 29/890.03
5,542,176 8/1996 Serizawa et al 29/890.03
5,771,966 6/1998 Jacoby 165/185
5,781,411 7/1998 Feenstra 361/704
FOREIGN PATENT DOCUMENTS
528606 8/1992 European Pat. Off 165/185
Primary Examiner—Ira S. Lazarus
Assistant Examiner—-Terrell McKinnon
Attorney, Agent, or Firm—-John R. Benefiel
[57] ABSTRACT
A heat sink and method ol manulacture is described. In the prelerred embodiment, an array ol tubes are extruded Irom a block ol conductive metal, such as aluminum. A series ol plugs or pins are extruded in a first stage, and the plugs are reverse extruded by tooling pins to form tubes ol considerable or varying length, integral with the base plate. The tube closed ends are punched so as to form holes through the base plate which has a groove crossing pattern aligned with the holes to provide an air convection flow path. The tubes may be assembled to a base plate as separate elements, and a channel member can also be utilized to provide flow passages extending to each tube.
10 Claims, 16 Drawing Sheets
