Joseph E Dezelan

US Patent:

45151814, May 7, 1985

Filed:

May 25, 1983

Appl. No.:

6/497985

Inventors:

Joseph E. Dezelan - Western Springs IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

F15B 1302

US Classification:

137596

Abstract:

A valve assembly (16) for use in a fluid system (10) includes a flow control valve (82) which controls fluid flow between a fluid inlet port (34) and a fluid supply passage (36) in response to the load requirements. A main control spool (96) is selectively movable between a neutral position and first and second actuated positions. A load sensing passage (78) communicates a load signal from an actuator (26) to the spring chamber (50) of the flow control valve (82). A drain passage (80) communicates the load sensing passage (78) with the reservoir (14) when the main control spool (96) is in the neutral position. A blocking mechanism (138) blocks the load sensing passage (78) when the main control spool (96) is in the neutral position and opens one of the inlet port (34) and the supply passage (36) to the spring chamber (50) so that the flow control spool (82) is held in an open position. Upon moving the main control spool (96) to one of its actuated positions, the drain passage is blocked from the reservoir (14) and a load pressure signal in the load sensing passage (78) moves the blocking mechanism from the blocking position to an open position and simultaneously closes the communication between the spring chamber (50) and one of the inlet port (34) and supply passage (36). This arrangement provides a system in which the actuator (26) responds more rapidly upon the main valve spool being moved to an actuated position since communication between the inlet port and supply passage is initially unrestricted.

US Patent:

40698866, Jan 24, 1978

Filed:

Jul 15, 1976

Appl. No.:

5/705728

Inventors:

John J. Campbell - Decatur IL
Joseph E. Dezelan - Joliet IL
Cullen P. Hart - Tokyo, JA

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

B60K 2500

US Classification:

180 44F

Abstract:

A vehicle such as a motor grader includes a hydrostatic auxiliary front wheel drive system which utilizes implement system pressurized fluid flow to drive a pair of fixed displacement hydraulic motors, such motors being drivingly connected to cause rotation of the front wheels. A pilot operated series-parallel valve in combination with a flow divider allows the motors to be driven in series or in parallel. A directional control valve is selectively responsive to operator control, and clutch actuation is accomplished automatically by directing a controlled portion of system fluid to such clutches to overcome the normal spring bias thereof.

US Patent:

40711064, Jan 31, 1978

Filed:

Sep 27, 1976

Appl. No.:

5/727187

Inventors:

John A. Junck - Joliet IL
Joseph A. Dezelan - Western Springs IL
Donald J. Larson - Joliet IL
Robert W. White - Joliet IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

B60K 2500

US Classification:

180 44F

Abstract:

A supplementary hydrostatic front wheel drive for a motor grader or the like utilizes pump flow from an already existing implement system as the source of supply to operate the drive wheel motors. The drive wheel motors are of the variable displacement over center type, and the system provides equal flow to both drive wheel motors to establish a synchronized rotational speed of both drive wheel motors. The displacements of the drive wheel motors are responsive to vehicle ground speed. The drive wheel components may include friction driving means which are responsive to the primary vehicle drive system.

US Patent:

43412807, Jul 27, 1982

Filed:

Feb 4, 1980

Appl. No.:

6/149354

Inventors:

Joseph E. Dezelan - Western Springs IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

B60K 2500

US Classification:

180243

Abstract:

A variable displacement auxiliary front wheel drive system (10) is provided which includes a variable displacement fluid motor (12, 14, 16) for driving at least one vehicle wheel. The fluid motor (12, 14, 16) receives fluid under pressure from a supply source (30, 32) connected to a variable displacement pressure compensated pump which supplies fluid to a hydraulic system for the vehicle accessories. To render the variable displacement fluid motor (12, 14, 16) inoperative, a fluid control system (34, 36, 40) may be selectively operated to block fluid flow from the supply source (30, 32) to the variable displacement fluid motor (12, 14, 16) and to a pressure compensating system (44) for the fluid motor (12, 14, 16). With fluid from the supply source (30, 32) blocked, a plurality of spool valves (46, 48, 50) in the pressure compensating system (44) are drained. When the fluid control system (34, 36, 40) is activated to again permit fluid to flow from the supply source (30, 32), a delay unit insures that fluid reaches a fluid clutch (96) before the variable displacement fluid motor (12, 14, 16) is activated.

US Patent:

39703274, Jul 20, 1976

Filed:

Jun 4, 1975

Appl. No.:

5/583365

Inventors:

Joseph E. Dezelan - Joliet IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

B06G 1700

US Classification:

280683

Abstract:

A tandem axle suspension assembly for a vehicle includes a pair of axles pivotally supported to the vehicle frame and including resilient means supporting the frame above each of the axles. The resilient means includes fluid cylinders for each of the axles and a source of fluid in open communication with both sets of cylinders and an accumulator to maintain an even load distribution on the respective axles. The fluid system includes a valve responsive to the position of one of the axles with respect to the frame to maintain the frame and axles at a predetermined distance apart. Means are also provided for raising one of the axles from contact with the supporting ground.

US Patent:

43543510, Oct 19, 1982

Filed:

Sep 29, 1980

Appl. No.:

6/250754

Inventors:

Joseph E. Dezelan - Western Springs IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

F15B 1304

US Classification:

60456

Abstract:

Fluid in the relatively long lines (22, 24) between a control valve (16) and a fluid actuator (14) can become overly viscous in cold weather. Herein, fluid is circulated through such lines (22, 24), at least during cold weather, even when the fluid actuator (14) is not being used. This flowing is discontinued in response to shifting of the control valve (16) to a position where it motivates the actuator (14) and in response to pressure in the circulating path (20) exceeding a selected level.

US Patent:

40172210, Apr 12, 1977

Filed:

Feb 27, 1976

Appl. No.:

5/661881

Inventors:

Joseph E. Dezelan - Indian Head Park IL

Assignee:

Caterpillar Tractor Co. - Peoria IL

International Classification:

F04B 4902
F16K 3114

US Classification:

417305

Abstract:

A hydraulic fluid circuit comprises an engine-driven pump for communicating pressurized fluid through a combined unloading and relief valve and to an implement control circuit of a construction vehicle. Actuating means are provided for selectively opening the valve during engine start-up to reduce fluid pressure in the valve and implement control circuit to a first predetermined level. An override means is operatively connected to the actuating means for preventing the valve from opening when the fluid pressure exceeds a second predetermined and operating level which is higher than the first predetermined level.

US Patent:

52263487, Jul 13, 1993

Filed:

Dec 14, 1992

Appl. No.:

7/990317

Inventors:

Joseph E. Dezelan - Joliet IL
Stephen J. Tlachac - Naperville IL

Assignee:

Caterpillar Inc. - Peoria IL

International Classification:

F15B 1108

US Classification:

91436

Abstract:

Quick drop valves are useful in directing fluid expelled from a contracting chamber of a hydraulic actuator to its expanding chamber under gravity load conditions. The present electro-hydraulic quick drop circuit improves the efficiency of the quick drop valve by energizing a solenoid valve to direct load generated pressure from the rod end chamber of the hydraulic actuators to an end of a quick drop valve for moving the quick drop valve to the quick drop position when a control valve is at or between a preselected intermediate operating position and its fully open position. The quick drop valve is moved to the quick drop position immediately upon the control valve reaching the preselected operating position so that the fluid expelled from the rod end chamber is directed to the head end chamber almost immediately after the blade begins to freefall. Also the quick drop valve totally blocks the rod end chambers from the control valve so that all the fluid expelled from the rod end chambers is directed to the head end chambers at the quick drop position of the quick drop valve.