Jeffrey HansellMarshalltown, IA

5307731, May 3, 1994

Nov 19, 1992

7/979185

Patric N. Chamberlain - Ankeny IA
Jeffrey C. Hansell - Ames IA

Sauer Inc. - Ames IA

F01G 2100

92147

A housing for hydraulic units includes a single cast unitary hollow housing having a continuous side wall extending between opposing forward and rearward walls to form an enclosed housing. Preferably, the continuous side wall includes opposing top and bottom walls, and opposing right and left side walls. A rotary axis is located between the forward and rearward walls, and is generally centered in an opening formed in the forward wall. Access openings are provided in the continuous side wall, transverse to the rotary axis, for installation of components within the housing during assembly.

5374156, Dec 20, 1994

Jul 5, 1994

8/270529

Clark C. Simpson - Lexington KY
Jeffrey C. Hansell - Ames IA
Jack L. Shafe - Paris KY

Clark Material Handling Company - Lexington KY

B66B 920

414667

A carriage assembly, 20h for a lift truck upright assembly, 12, has pivotally mounted forks, 30, controlled by hydraulic cylinders, 36, that are operated by side shifter circuit, 110, having a single operator control, 124, for manipulating the forks in unison, opening or closing the forks, or shifting them right or left in a coordinated fashion.

5271722, Dec 21, 1993

Jan 11, 1993

8/002814

Jeffrey C. Hansell - Ames IA

Sauer Inc. - Ames IA

F04B 4900

417278

An automotive control system for hydrostatic pumps includes a hydraulic circuit with an automotive orifice located upstream of the main hydrostatic loop with replenishing check valves and downstream of the fill pump. The location of the automotive orifice upstream of the check valves isolates system leakage from affecting flow to the automotive orifice. A hydrostatic unit displacement control valve has a drain side connected to the hydraulic circuit downstream of the fill pump and in parallel with the automotive orifice, and has a supply side connected downstream of the automotive control orifice. The input logic of the control valve is reversed to compensate for the greater pressure available to the drain side of the control valve as compared to the supply side. Reversing the input logic of the control valve provides servo control pressures without the need to isolate the control supply from the hydrostatic loop supply.

5983776, Nov 16, 1999

Nov 23, 1998

9/198664

Jeffrey C. Hansell - Ames IA

Sauer Inc. - Ames IA

F01B 1304

92 122

A hydraulic slipper includes a slipper body having first and second ends and a central portion therebetween. The first end terminates in a spherical-shaped head. The second end terminates in a round base portion with a hub protruding outwardly therefrom in the direction away from the head. The hub terminates in a planar surface and has a diameter less than the diameter of the round base portion. The slipper includes a washer element having a center opening extending around the hub and having first and second opposite planar surfaces. The first surface engages the base portion, and the second surface extends beyond the planar surface of the hub to create a running face for the slipper. The washer element can be a bi-metal ring formed of steel and bronze.

5540563, Jul 30, 1996

Sep 16, 1994

8/307177

Jeffrey C. Hansell - Ames IA

Sauer Inc. - Ames IA

F04B 2708

417269

A unitary housing for a hydraulic unit such as tandem pump, having a plurality of rotating groups driven in one direction about a common axis by a source of rotary power having a pair of opposite end walls generally transverse to the common axis, a continuous side wall connecting the end walls, and at least two apertures in the side wall which allow the insertion of a rotating group into the housing. The housing can also include a first flange on one of the end walls for mounting the housing to a source of rotary power. A second flange can be included on the other end wall for mounting an auxiliary pump to the main hydraulic unit. Alternatively, if the second flange is the same size as the first flange, the housing allows the user to change the rotation of the tandem pump by spinning the housing end-for-end and without changing any internal components.

5941159, Aug 24, 1999

Jan 9, 1998

9/005253

Jeffrey C. Hansell - Ames IA
Charles M. Pohar - Roland IA

Sauer Inc. - Ames IA

F01B 1304

92 71

A holddown pin mechanism for hydraulic power units has a cylindrical flat base washer having a central opening and opposite sides, a plurality of spaced elongated holddown pins have one end rigidly secured to one side of said base washer and an outer end. The pins extend outwardly at right angles from the side of said washer to which they are secured. The holddown pin mechanism is placed in a hydraulic cylinder block having a center bore, with the pins extending into holes in the block. A guide member on a shaft extending through the block engages the free ends of the pins.

2020004, Feb 6, 2020

Jul 31, 2018

16/050001

- Ames IA, US
Stephen Frantz - Ames IA, US
Jeffrey C. Hansell - Boone IA, US

F03C 1/06
F03C 1/00
F03C 1/08
F04B 1/20
F04B 1/32
F04B 1/12

A hydraulic piston unit including a rotational group for driving or being driven by a driving shaft, and having a tiltable displacement element for adjusting the displacement volume of the rotational group between a minimum or a maximum displacement, wherein, on t valve segment between a kidney-shaped inlet port and a kidney-shaped outlet port at respective dead end positions of reciprocally moveable working pistons first and second control ports are located in fluid connection with cylinder bores in the cylinder block, for controlling the position of the displacement element. The hydraulic piston unit further includes a control valve with a shiftable control valve spool fluidly connected via a high pressure port to a high pressure side of the hydraulic piston unit. The control valve spool is configured to conduct hydraulic fluid from the high pressure side to one of the first or the second control port.