Douglas Mcarthur Williams

US Patent:

6895748, May 24, 2005

Filed:

Mar 20, 2003

Appl. No.:

10/392684

Inventors:

Douglas G. Williams - Bedford IN, US
C. Paul Cox - Sellersburg IN, US
Kevin L. Johnson - Douglas GA, US

Assignee:

Tecumseh Products Company - Tecumseh MI

International Classification:

F16D031/02

US Classification:

60494

Abstract:

A hydrostatic transmission including a pump, a motor, and a center section provided with a conduit through which the pump and motor are in fluid communication and a valve. The pump, motor and center section are disposed in a housing having a plurality of walls which at least partially define a sump, the conduit being in fluid communication with the sump through the valve when the valve is open. A hydraulic disconnect mechanism is provided which includes a substantially rigid first portion, and a second portion operatively engaged with the first portion and being at least partially resilient. The valve is operably engaged with and opened by the second portion in response to the first portion being in an engaged position, and the valve is not operably engaged with the second portion when the first portion is in a disengaged position.

US Patent:

20020178708, Dec 5, 2002

Filed:

May 14, 2002

Appl. No.:

10/145864

Inventors:

Douglas Williams - Bedford IN, US
Kevin Johnson - Douglas GA, US

International Classification:

A01D069/00

US Classification:

056/010800

Abstract:

A self-propelled, walk-behind implement including a body, an engine attached to the body and having an output shaft, ground-engaging drive wheels, and a transaxle. The transaxle includes a housing, a input shaft extending into the housing and selectively operatively engaged with the output shaft, an axle having an axis of rotation and extending through the housing, the drive wheels coupled to the axle, a rotatable driving member disposed within the housing and engaged with the input shaft, and a driven member disposed within the housing and driven by the driving member. The driven member has a first axial position along the axle in which the driven member is not engaging the axle and the axle is freely rotatable, and a second axial position in which the driven member is in operative engagement with the driving member and the axle and the input and output shafts are operatively engaged.

US Patent:

20040123594, Jul 1, 2004

Filed:

Dec 30, 2002

Appl. No.:

10/331717

Inventors:

Douglas Williams - Bedford IN, US
C. Cox - Sellersburg IN, US

International Classification:

F16D031/02

US Classification:

060/468000

Abstract:

A hydrostatic transmission including a fluid motor in communication with a variable displacement fluid pump having a first displacement rate and a second greater displacement rate, a pump block having at least one fluid conduit through which fluid flows from the pump to the motor, an external fluid sump, a cylindrical pintle fixed to the block having a first bleed hole and a second bleed hole in communication with the first bleed hole, and a ring in sliding engagement with the pintle and having a slot in selective communication with the second bleed hole. The conduit and the sump are in communication through the bleed holes and the slot at the first displacement rate, and the fluid conduit and the sump are out of fluid communication at the second displacement rate.