David N Tesh

US Patent:

54898544, Feb 6, 1996

Filed:

Apr 1, 1993

Appl. No.:

8/041496

Inventors:

Roy V. Buck - Oak Ridge NC
David N. Tesh - Randleman NC

Assignee:

Analog Devices, Inc. - Norwood MA

International Classification:

G01R 1512

US Classification:

324761

Abstract:

A test socket for a surface mount IC chip includes an array of double-ended spring contacts that extend out from opposite sides of a substrate, with a positioning frame on top of the substrate for aligning a chip and its leads with the upper contact heads. The spring contacts preferably have hollow elongate bodies with contact heads extending out from opposite sides under an internal spring bias. The socket can be formed from two laminates which have a series of aligned openings for the spring contacts, with expanded midsections on the spring contacts press-fit into the laminate openings and thereby securing holding the laminates together. A standoff on the upper socket surface vertically positions the IC chip, and provides the proper contact pressure between its leads and the spring contacts. The test socket can be removably mounted to a PC test board, with a releasable clamping device such as an air cylinder used to hold a chip to be tested in place within the socket.

US Patent:

48939463, Jan 16, 1990

Filed:

May 15, 1989

Appl. No.:

7/352001

Inventors:

David W. Tesh - Greensboro NC
David D. Wesner - Greensboro NC

Assignee:

Amkor Industries, Inc. - Greensboro NC

International Classification:

F16C 1920

US Classification:

384549

Abstract:

A spinning frame roller comprising a core body on an outer peripheral surface of which is provided a circumferentially continuous, radially reentrant dovetail channel, with a correspondingly configured peripheral annular ring having a radially inwardly extending dovetail protrusion on its inner face matably engaging the dovetail channel and outer peripheral surface. The peripheral annular ring has an aspect ratio (radial thickness/axial thickness) of from about 0. 25 to about 0. 65, and is formed of a material having a durometer value of from about 55 to about 90. The roller in use is mounted on a shaft in a spinning frame for textile processing applications, and achieves extended wear and reduced tendency to "throwing" of the peripheral annular ring, relative to prior art rollers characterized by low durometer, high aspect ratio peripheral annular rings.