Leonard Joseph Cook

US Patent:

6872048, Mar 29, 2005

Filed:

Nov 26, 2001

Appl. No.:

09/994294

Inventors:

Robert B. Uselton - Plano TX, US
Leonard J. Cook - Lewisville TX, US
Terry Wright - Panama City Beach FL, US

Assignee:

Lennox Industries, Inc. - Richardson TX

International Classification:

F01D005/16
F04D029/68

US Classification:

415119, 416228, 416235, 416236 R

Abstract:

Axial flow fan propellers are provided with a roughened portion along the trailing edge of the fan blades on the pressure side of the blade to minimize tonal acoustic emissions generated by laminar boundary layer vortex shedding. The roughened portion may be provided by trip surfaces formed in the blades, by strips of abrasive material adhered to the blades along the trailing edges, respectively, by parallel or cross-hatched serrations in the blades or by upturned or offset trailing edges of the blades. The height of the roughened portion should be about equal to the boundary layer thickness of air flowing over the blade surfaces during operation of the fan. The fan propellers are particularly advantageous in heat exchanger applications, such as residential air conditioning system condenser units.

US Patent:

7137268, Nov 21, 2006

Filed:

Nov 17, 2004

Appl. No.:

10/990566

Inventors:

Leonard J. Cook - Lewisville TX, US
Kevin R. Keoppel - Frisco TX, US
Adam C. Bunnell - Ames IA, US

Assignee:

Lennox Manufacturing Inc. - Marshalltown IA

International Classification:

F25D 19/00

US Classification:

62296, 165 69, 181207, 248638

Abstract:

A device is provided for dampening compressor-induced vibration in an air conditioning system of the type having an indoor unit, an outdoor unit and a refrigerant conduit therebetween. The outdoor unit includes a compressor that is operable to circulate a vapor compression refrigerant through the conduit between the indoor and outdoor units. The device is comprised of a support member containing a section of refrigerant line. The support member is located beneath the outdoor unit and the refrigerant line section is interposed in a portion of the refrigerant conduit between said compressor and said indoor unit, such that the refrigerant flowing between the indoor unit and the compressor is routed through the line section in the outdoor unit support member.

US Patent:

7351041, Apr 1, 2008

Filed:

Feb 10, 2005

Appl. No.:

11/055469

Inventors:

Robert B. Uselton - Plano TX, US
Leonard J. Cook - Lewisville TX, US
Terry Wright - Panama City Beach FL, US

Assignee:

Lennox Industries Inc. - Richardson TX

International Classification:

F04D 29/68

US Classification:

416236R, 416DIG 3, 415119

Abstract:

Axial flow fan propellers are provided with a roughened portion along the trailing edge of the fan blades on the pressure side of the blade to minimize tonal acoustic emissions generated by laminar boundary layer vortex shedding. The roughened portion may be provided by trip surfaces formed in the blades, by strips of abrasive material adhered to the blades along the trailing edges, respectively, by parallel or cross-hatched serrations in the blades or by upturned or offset trailing edges of the blades. The height of the roughened portion should be about equal to the boundary layer thickness of air flowing over the blade surfaces during operation of the fan. The fan propellers are particularly advantageous in heat exchanger applications, such as residential air conditioning system condenser units.

US Patent:

20190178493, Jun 13, 2019

Filed:

Dec 11, 2017

Appl. No.:

15/837364

Inventors:

- Richardson TX, US
Leonard J. COOK - Lewisville TX, US
David CHILSON - Lewisville TX, US

Assignee:

Lennox Industries Inc. - Richardson TX

International Classification:

F23M 20/00
F24D 5/04

Abstract:

A sound level reducing apparatus and method for reducing the outdoor sound level produced by a high efficiency gas furnace. The apparatus comprising a muffler having an internal length determined by an identified target pure tone frequency producing an undesirable sound level. The internal length may be optimized to reduce the sound level across a range of operational frequencies.