John D Larson

US Patent:

55393853, Jul 23, 1996

Filed:

Apr 21, 1995

Appl. No.:

8/426830

Inventors:

Paul J. Duff - Lebanon CT
John P. Larson - Burlington CT
Joseph B. Lechtanski - Castle Rock CO

Assignee:

Carrier Corporation - Syracuse NY

International Classification:

G08B 2100

US Classification:

340626

Abstract:

Refrigerant pressure in the condenser unit of a chiller is monitored relative to a real time alarm limit for the refrigerant pressure. The real time alarm limit is computed from time to time by a microprocessor. The value of the computed alarm limit will vary with the cooling load being experienced by the chiller's evaporator unit.

US Patent:

58459987, Dec 8, 1998

Filed:

Nov 27, 1996

Appl. No.:

8/757783

Inventors:

John A. Larson - Collinsville CT
Maksimilijan Godec - Torrington CT
Walter P. Waskiewicz - Bristol CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

F16C 3362

US Classification:

384492

Abstract:

A ball bearing assembly includes a polymer outer bearing ring molded over and partially enclosing a metal annular outer raceway. The metal annular outer raceway may be economically formed from sheet metal or wire. The polymer outer bearing ring may be mounted within a metal housing to provide support and/or self-alignment capability.

US Patent:

47096632, Dec 1, 1987

Filed:

Dec 9, 1986

Appl. No.:

6/939819

Inventors:

John W. Larson - Sturbridge MA
Ronald W. Breault - Paxton MA

Assignee:

Riley Stoker Corporation - Worcester MA

International Classification:

F22B 100

US Classification:

122 4D

Abstract:

A flow control device for solid particulate material such as recycled granular solids utilized in a fluidized bed combustion vessel includes a generally horizontal material feeder conduit having an outlet end in communication with the fluidized bed of the combustion vessel and a receiving end remote therefrom. An upstanding material collector conduit having a lower end in communication with a receiving end of the feeder conduit is provided and an upper end of the collector conduit is adapted to receive a flow of particulate solid material to be fed at a controlled flow rate into the combustion vessel. The upstanding collector conduit forms a standpipe for retaining a quantity of material to establish a pressure sealing head or column of material extending upwardly of the receiving end of the feeder conduit. A gas assisted flow initiator and controller extends into the feeder conduit for directing a flow of pressurized gas into the solid particulate material to fluidize the same for travel into the combustion vessel at a selected flow rate.

US Patent:

56776772, Oct 14, 1997

Filed:

Apr 21, 1995

Appl. No.:

8/426810

Inventors:

Paul J. Duff - Lebanon CT
John P. Larson - Burlington CT
Joseph B. Lechtanski - Castle Rock CO

Assignee:

Carrier Corporation - Syracuse NY

International Classification:

G08B 2100

US Classification:

340585

Abstract:

The difference between the temperature of a heat exchange medium leaving the evaporator unit of a chiller and the temperature of the refrigerant in the evaporator unit is monitored relative to a real time alarm limit for this temperature difference. The real time alarm limit is computed from time to time by a microprocessor. The value of the computed alarm limit will vary with the cooling load being experienced by the chiller's evaporator unit.

US Patent:

54823838, Jan 9, 1996

Filed:

Dec 16, 1994

Appl. No.:

8/357803

Inventors:

Michael A. Gantt - Granby CT
John A. Larson - New Hartford CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

F16C 3358

US Classification:

384513

Abstract:

There is disclosed a bearing for mounting on a multi-sided shaft having an outer race and an inner race coaxial with and rotatable relative to the outer race. The inner race is formed with a central bore having a plurality of internal corners which accommodate a multi-sided shaft. The central bore is preferably adapted to accommodate hexagonal and square shafts. The central bore has at least one circumferential groove in the bore and an elastomeric ring mounted into the groove. The grooves are formed at such depth that the elastomeric ring is exposed at the internal corners of the central bore whereby when the bearing is mounted the elastomeric material will contact the shaft and dampen the relative motion between the bearing and the shaft.

US Patent:

47762616, Oct 11, 1988

Filed:

May 8, 1987

Appl. No.:

7/047770

Inventors:

John W. Larson - Sturbridge MA

International Classification:

F01B 3100

US Classification:

92174

Abstract:

Apparatus for sealing the gap between a piston and engine cyinder wall of either a reciprocating engine or a reciprocating compressor. The apparatus includes a plurality of functionally-identical, gas-bearing-supported seal blocks that locate in a slot running circumferentially around the engine piston. Gases fed from the engine chamber to the gas bearing carrying the load on the seal block in the direction of piston travel. The seal block includes a gas accumulator cavity for gas storage. An orifice feeds gas from the gas accumulator cavity to the gas bearing interfacing between the seal block and the engine cylinder wall. The apparatus also includes a reaction piston having gas communicated thereto from the engine chamber.

US Patent:

54683084, Nov 21, 1995

Filed:

Aug 22, 1994

Appl. No.:

8/294220

Inventors:

Joseph F. Braza - Simsbury CT
John A. Larson - Collinsville CT

Assignee:

The Torrington Company - Torrington CT

International Classification:

C22C 3700
C21D 109

US Classification:

148321

Abstract:

A bearing blank is cast or machined of cast iron to a configuration near a final shape of a desired bearing element. A first surface of the bearing blank, corresponding to a sliding surface of the desired bearing element, is remelted while other portions of the bearing blank remain in a solid state. The remelted first surface is quenched such that fine particles of iron carbide precipitate in a remelted zone having an increased hardness and a decreased presence of graphite particles. A bearing element having a core portion composed of cast iron and an integral first surface portion including a precipitate of fine iron carbide particles, and having greater hardness and lesser incidence of graphite particles than the core portion, is also described.

US Patent:

55393829, Jul 23, 1996

Filed:

Apr 21, 1995

Appl. No.:

8/426827

Inventors:

Paul J. Duff - Lebanon CT
John P. Larson - Burlington CT
Joseph B. Lechtanski - Castle Rock CO

Assignee:

Carrier Corporation - Syracuse NY

International Classification:

G08B 2100

US Classification:

340555

Abstract:

The difference between the temperature of refrigerant leaving the condenser unit of a chiller and the temperature of water leaving the same condenser unit is monitored relative to a real time alarm limit for this temperature difference. The real time alarm limit is computed from time to time by a microprocessor. The value of the computed alarm limit will vary with the cooling load being experienced by the chiller's evaporator unit.