Clarence M Asbill

US Patent:

40748553, Feb 21, 1978

Filed:

May 26, 1976

Appl. No.:

5/690070

Inventors:

Harold G. Brakebill - Richmond VA
Jay L. Lewis - Knoxville TN
Clarence M. Asbill - Knoxville TN

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

G01K 562

US Classification:

236 87

Abstract:

An adjustable bimetal construction adapted to provide an adjustable throttling range and having a first bimetal member and a second bimetal member, one opposed end of the first bimetal member being operatively interconnected to the frame while the other end thereof is movable relative to the frame and one opposed end of the second bimetal member also being operatively interconnected to the frame while the other end thereof is movable relative to the frame. A device operatively interconnects the other ends of the bimetal members together to provide a combined bimetal action at the other ends thereof which can be adjusted through different positions of the device.

US Patent:

49968858, Mar 5, 1991

Filed:

Feb 27, 1990

Appl. No.:

7/485454

Inventors:

Clarence M. Asbill - Richmond VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

G01F 100

US Classification:

7386148

Abstract:

A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter comprising a unit for producing an output pneumatic signal from a pneumatic source in relation to the air velocity pressure of air flowing in a passage, a unit that senses the difference between the total pressure and the static pressure of the air flowing in the passage, and a unit for extracting the square root of the air velocity pressure of the air from the pneumatic output signal as the pneumatic output signal is being produced so that the pneumatic output signal is substantially linear with respect to the air velocity of the air flow in the passage whereby the transmitter comprises a linear air velocity transmitter, the unit for extracting the square root comprising a cam having a cam face that defines at least part of the involute of a circle.

US Patent:

48339245, May 30, 1989

Filed:

Oct 30, 1987

Appl. No.:

7/114789

Inventors:

Clarence M. Asbill - Richmond VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

G01F 146

US Classification:

7386148

Abstract:

A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter comprising a unit for producing an output pneumatic signal from a pneumatic source in relation to the air velocity pressure of air flowing in a passage, a unit that senses the difference between the total pressure and the static pressure of the air flowing in the passage, and a unit for extracting the square root of the air velocity pressure of the air from the pneumatic output signal as the pneumatic output signal is being produced so that the pneumatic output signal is substantially linear with respect to the air velocity of the air flow in the passage whereby the transmitter comprises a linear air velocity transmitter, the unit for extracting the square root comprising a cam having a cam face that defines at least part of the involute of a circle.

US Patent:

41651391, Aug 21, 1979

Filed:

Feb 7, 1978

Appl. No.:

5/875950

Inventors:

Clarence M. Asbill - Richmond VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

H01R 304

US Classification:

339 15

Abstract:

A manifold adapted to detachably carry on one side thereof a plurality of pneumatically and electrically operated control units each of which is adapted to be fluidly and electrically interconnected to pneumatic structure and electrical structure of the manifold. That one side of the manifold has external interconnecting structure for the pneumatic structure and the electrical structure whereby external pneumatic and electrical lines can be interconnected to the same side of the manifold that the units are adapted to be interconnected thereto.

US Patent:

49227602, May 8, 1990

Filed:

Mar 28, 1989

Appl. No.:

7/329756

Inventors:

Clarence M. Asbill - Richmond VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

G01F 146

US Classification:

7386148

Abstract:

A differential pressure transmitter, a pneumatically operated square root extracting device therefor and methods of making the same are provided, the transmitter comprising a unit for producing an output pneumatic signal from a pneumatic source in relation to the air velocity pressure of air flowing in a passage, a unit that senses the difference between the total pressure and the static pressure of the air flowing in the passage, and a unit for extracting the square root of the air velocity pressure of the air from the pneumatic output signal as the peneumatic output signal is being produced so that the pneumatic output signal is substantially linear with respect to the air velocity of the air flow in the passage whereby the transmitter comprises a linear air velocity transmitter, the unit for extracting the square root comprising a cam having a cam face that defines at least part of the involute of a circle.

US Patent:

45761949, Mar 18, 1986

Filed:

Apr 19, 1984

Appl. No.:

6/602018

Inventors:

William L. Lucas - Henrico County VA
Clarence M. Asbill - Richmond VA
Gerald L. Frank - Henrico County VA
David M. Miller - Henrico County VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

G05D 1600

US Classification:

137 84

Abstract:

A pneumatic control system, control unit and method of making the same are provided, the system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control unit for interconnecting the source to the device. The control unit has an input interconnected to the source and an output interconnected to the device, the control unit having a set point for selecting a desired output of the device. The control unit has a valve unit for controlling the interconnection between the input and the output thereof so as to regulate the pressure value in the output of the control unit. The control unit has a regulating unit for operating the valve unit to tend to produce an output of the device that corresponds to the selected output of the set point. The regulating unit senses the pressure value in the output of the control unit and operates the valve unit so as to produce a pressure value in the output of the control unit that is substantially equal to the pressure value that will cause the device to produce the selected output.

US Patent:

46795839, Jul 14, 1987

Filed:

Dec 23, 1985

Appl. No.:

6/812367

Inventors:

William L. Lucas - Henrico County VA
Clarence M. Asbill - Richmond VA
Gerald L. Frank - Henrico County VA
David M. Miller - Henrico County VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

G05D 1600

US Classification:

137 84

Abstract:

A pneumatic control system, control unit and method of making the same are provided, the system comprising a pneumatic source, a pneumatically operated device that produces an output, and a control unit for interconnecting the source to the device. The control unit has an input interconnected to the source and an output interconnected to the device, the control unit having a set point for selecting a desired output of the device. The control unit has a valve unit for controlling the interconnection between the input and the output thereof so as to regulate the pressure value in the output of the control unit. The control unit has a regulating unit for operating the valve unit to tend to produce an output of the device that corresponds to the selected output of the set point. The regulating unit senses the pressure value in the output of the control unit and operates the valve unit so as to produce a pressure value in the output of the control unit that is substantially equal to the pressure value that will cause the device to produce the selected output.

US Patent:

40933296, Jun 6, 1978

Filed:

Mar 22, 1977

Appl. No.:

5/780038

Inventors:

Clarence M. Asbill - Richmond VA

Assignee:

Robertshaw Controls Company - Richmond VA

International Classification:

H01R 304

US Classification:

339 16R

Abstract:

A manifold adapted to detachably carry on one side thereof a plurality of pneumatically and electrically operated control units each of which is adapted to be fluidly and electrically interconnected to pneumatic structure and electrical structure of the manifold. That one side of the manifold has external interconnecting structure for the pneumatic structure and the electrical structure whereby external pneumatic and electrical lines can be interconnected to the same side of the manifold that the units are adapted to be interconnected thereto.