OpenTechnical
This is a record of a document published elsewhere, first published by the United States Patent and Trademark Office, as US-6308612-B1, on 30 October 2001. OpenTechnical did not first disclose it. The identifier, hashes and timestamps below record what this library served and when, not when the material became public. View the original.

OT-2026-000003087

Hydraulic leveling control system for a loader type vehicle

Published
Permanent URL
Classification
Industrial Motion & Power Transmission › Fluid Power
Inventors
EMANIE FARAIDOON FRED, FREY BRIAN ANDREW
Assignee
DELTA POWER COMPANY
Original source
US-6308612-B1, the United States Patent and Trademark Office, 30 October 2001
Document SHA-256
b2fc4db78d1c827a200c9e575f9da7eb62343efcad056f890e38cb74e38e8695

A control system for a lift boom pivotable with respect to a vehicle by a boom cylinder and material handling unit pivotable with respect to the boom by a unit cylinder when the control of a boom control valve and a unit control valve. The control system includes a flow divider/combiner valve and operative in a boom-raise, unit-leveling mode to pass a preset portion of the fluid displaced from the rod end of the boom cylinder to the base end of the unit cylinder. The flow divider-combiner valve is operative in a boom-lower, unit-leveling mode, to combine the fluid stream displaced from the base end unit cylinder in a preset ratio with pressurized fluid, and pass the combined stream to the rod end of the boom cylinder. The control system can be disengaged from the automatic leveling mode to enable the boom unit to be operated manually under the control of the boom and unit control valves.

Sheet 1
Sheet 1
Sheet 2
Sheet 2
Sheet 3
Sheet 3
Sheet 4
Sheet 4

Abstract

A control system for a lift boom pivotable with respect to a vehicle by a boom cylinder and material handling unit pivotable with respect to the boom by a unit cylinder when the control of a boom control valve and a unit control valve. The control system includes a flow divider/combiner valve and operative in a boom-raise, unit-leveling mode to pass a preset portion of the fluid displaced from the rod end of the boom cylinder to the base end of the unit cylinder. The flow divider-combiner valve is operative in a boom-lower, unit-leveling mode, to combine the fluid stream displaced from the base end unit cylinder in a preset ratio with pressurized fluid, and pass the combined stream to the rod end of the boom cylinder. The control system can be disengaged from the automatic leveling mode to enable the boom unit to be operated manually under the control of the boom and unit control valves.

1. Drawings

[0001]Sheet 1.

[0002]Sheet 2.

[0003]Sheet 3.

[0004]Sheet 4.

Publication information

Plain textMarkdownManifestIntegrity record

Citation

OpenTechnical Publication OT-2026-000003087, “Hydraulic leveling control system for a loader type vehicle,” published September 15, 2026 at 19:25:52 UTC, https://opentechnical.org/p/OT-2026-000003087.

To cite specific content, add the paragraph or figure numbers.

Terms

This record reproduces a document published elsewhere and is provided for reference and study. Rights in the original remain with its owner. See the publication policy.