Wilhelm F Schmitt

US Patent:

40327434, Jun 28, 1977

Filed:

Jun 27, 1975

Appl. No.:

5/590868

Inventors:

Arthur R. Erbach - Des Plaines IL
Allen R. Franck - Glen Ellyn IL
Dennis L. Mulee - Schaumburg IL
Wilhelm E. Schmitt - Schaumburg IL

Assignee:

Marvel Engineering Company - Chicago IL

International Classification:

B23K 2600

US Classification:

219121LM

Abstract:

A method and apparatus for forming rows and columns of closely spaced micron sized holes in a thin foil, including a cylindrical member and means for rotating it. There are means for mounting a plurality of axially extending foil strips on the cylindrical member and means for moving said foil strips axially of the cylinder. There are a plurality of stationary lasers uniformly positioned in a single plane about the periphery of said cylindrical member and means for correlating movement of said cylindrical member, axial movement of the foil strips and the firing of said lasers so as to form holes as described in closely spaced rows and columns.

US Patent:

43852971, May 24, 1983

Filed:

Jan 14, 1980

Appl. No.:

6/111719

Inventors:

Wilhelm E. Schmitt - Elmhurst IL
Robert V. C. Dickinson - Berkely Heights NJ

International Classification:

G08C 1906
G08C 1912
G01B 714

US Classification:

34087031

Abstract:

An eddy current coupled transducer and external electrical circuit are disclosed for use with a fluid actuator for detecting the relative position of the reciprocating member of the actuator. The transducer includes a fitting providing a fluid pressure seal whereby the transducer can be fitted to the actuator and communicate with its interior. The transducer detects the absolute position of the reciprocating member of the actuator by eddy current coupling. A change in the amplitude of the high frequency signal supplied to the transducer by the external electrical circuit occurs when the reciprocating member is in close proximity to the transducer. This change in amplitude is detected by the electrical circuit to provide an on-off switching signal for associated equipment in response to the position of the actuator reciprocating member.