John Wesley Ellison

US Patent:

46790292, Jul 7, 1987

Filed:

Sep 4, 1984

Appl. No.:

6/647031

Inventors:

David A. Krohn - Hamden CT
David R. Maack - Madison CT
Edmond I. Vinarub - Cheshire CT
John R. Ellison - Bethany CT

Assignee:

Eotec Corporation - West Haven CT

International Classification:

H03K 1302

US Classification:

340347P

Abstract:

An apparatus is disclosed for sensing rotational or angular position of a shaft. The apparatus incorporates two light transmission paths, each having a separate photodetector providing an electrical signal in response to the intensity of received light. The electrical signals from the photodetectors are differentially processed to obtain a signal representative of rotational position. Devices are provided in each of the light transmission paths to vary the intensity of light transmitted in the path, and these devices are mechanically coupled to the shaft so that the variations in the respective light paths are opposite. The differentially processed photodetector signals are therefore unaffected by the absolute position of the shaft but are responsive only to deviations from a reference position. Futhermore, this differentially processed signal exhibits a higher degree of linearity was heretofor obtainable. Various embodiments are disclosed for achieving this opposite variation in the respective light paths.

US Patent:

40518612, Oct 4, 1977

Filed:

Nov 3, 1975

Appl. No.:

5/628379

Inventors:

John E. Ellison - Newington CT
Herbert M. Flink - East Hartford CT

Assignee:

Skinner Precision Industries, Inc. - New Britain CT

International Classification:

F15B 1308

US Classification:

137315

Abstract:

An arrangement which connects a pair of valve mounting manifold blocks in end-to-end abutment includes each block having an opening in oneend thereof, the respective end openings in the pair of blocks being in registry with one another when the respective ends of the pair of blocks are aligned and abut one another. A fastener extends from the opening in one block into the opening in the other block, and the opposite ends of the fastener are respectively fixed to the blocks such that the fastener is contained substantially entirely within the blocks. The openings may be defined by slots in the bottom of each block and the fastener may be a screw extending within the slots in threaded engagement with a nut.

US Patent:

46986162, Oct 6, 1987

Filed:

Nov 26, 1986

Appl. No.:

6/935344

Inventors:

David A. Krohn - Hamden CT
David R. Maack - Madison CT
Edmond I. Vinarub - Cheshire CT
John R. Ellison - Bethany CT

Assignee:

Eotec Corp - New Haven CT

International Classification:

H03K 1302

US Classification:

340347P

Abstract:

An apparatus is disclosed for sensing rotational or angular position of a shaft. The apparatus incorporates two light transmission paths, each having a separate photodetector providing an electrical signal in response to the intensity of received light. The electrical signals from the photodetectors are differentially processed to obtain a signal representative of rotational position. Devices are provided in each of the light transmission paths to vary the intensity of light transmitted in the path, and these devices are mechanically coupled to the shaft so that the variations in the respective light paths are opposite. The differentially processed photodetector signals are therefore unaffected by the absolute position of the shaft but are responsive only to deviations from a reference position. Furthermore, this differentially processed signal exhibits a higher degree of linearity was heretofore obtainable. Various embodiments are disclosed for achieving this opposite variation in the respective light paths.