Anthony J Clark

US Patent:

40614425, Dec 6, 1977

Filed:

Oct 6, 1975

Appl. No.:

5/619901

Inventors:

Anthony W. Clark - Carrollton TX
Rex G. Stubbs - Garland TX

Assignee:

Beckett Corporation - Dallas TX

International Classification:

F04B 4900
F25D 1702
G08B 2100

US Classification:

417 36

Abstract:

The specification discloses a technique for controlling a pump to maintain a body of liquid below a maximum liquid level. A low voltage high frequency signal is applied to a conductive first probe which extends to a desired maximum liquid level. The high frequency signal is also applied to an electronic detector and switching circuit in order to maintain the switching circuit in a first state when the liquid level does not contact the first probe. The effect of the application of the high frequency signal to the switching circuit is reduced when the liquid level contacts the first probe, thereby changing the switching circuit to a second state. A pump is then energized to lower the liquid level in response to the second state of the switching circuit. A second probe is then coupled to receive the high frequency signal. The second probe extends to a lower level than does the first probe, thereby maintaining the pump in an energized state until the liquid level falls below the second probe.

US Patent:

44847025, Nov 27, 1984

Filed:

Mar 25, 1983

Appl. No.:

6/478950

Inventors:

Charles J. Sabonis - Plano TX
Anthony W. Clark - Dallas TX

Assignee:

Xerox Corporation - Stamford CT

International Classification:

G03B 130

US Classification:

226 74

Abstract:

A tractor feed assembly for an automatic printer. A manually operated tension bar is provided between the tractor feeder and the printer platen. The bar is locked in place by a spring that biases a knob attached to the bar into locking contact with a member formed on or attached to the tractor feed frame.