David W Keck

US Patent:

53528581, Oct 4, 1994

Filed:

Jul 19, 1993

Appl. No.:

8/093767

Inventors:

David W. Keck - Michigan City IN

Assignee:

Dwyer Instruments, Inc. - Michigan City IN

International Classification:

H01H 904

US Classification:

2003021

Abstract:

A hermetically sealed snap switch assembly involving a housing that includes a hermetically sealed snap switch chamber in which a projecting terminal type subminiature snap action switch is mounted in slip fit association with a similar number of depending electrically conductive open ended tubes that are adapted to, prior to use of the switch assembly involved, be respectively hermetically sealed to the switch terminal that is received in same, and be respectively electrically connected in suitable circuitry at the option of the installer, with the arrangement of the assembly being such that optionally a selected one of the depending tubes, prior to such hermetically sealing of same, may be employed for switch chamber purging and backfilling purposes, after which said sealing of same is effected. Also disclosed is a method of backfilling said switch chamber (using such backfilling option) with a switch life enhancing gas.

US Patent:

53570677, Oct 18, 1994

Filed:

May 18, 1993

Appl. No.:

8/063493

Inventors:

David W. Keck - Michigan City IN

Assignee:

Dwyer Instruments, Inc. - Michigan City IN

International Classification:

F16H 5304
H01H 1962

US Classification:

200 30A

Abstract:

A rotary position indicator for use with devices such as valves, electrical switches, and non-contact reed and proximity switches, which rotary position indicator includes a shaft rotatable about its longitudinal axis and includes a single plane adjustable cam bearing an external profile at its margin that is shaped to provide a camming portion for predetermined dwell and a camming portion for actuator of the device controlled thereby, which provides the option of adjusting the position of the cam relative to the shaft by the user manually shifting the cam in its plane to effect release of the cam relative to the shaft for rotation relative to the shaft to its new working position, with automatic releasable locking of said cam in its new working position then being effected.