Marlin W Ritchie

US Patent:

20040154290, Aug 12, 2004

Filed:

Feb 12, 2003

Appl. No.:

10/365588

Inventors:

Leonard Kruppa - Temple TX, US
Scott Jones - Temple TX, US
Marlin Ritchie - Temple TX, US
Mark Kosel - Temple TX, US

Assignee:

Texas Hydraulics, Inc.

International Classification:

F16D031/00

US Classification:

060/325000

Abstract:

A serial, multi-unit hydraulic system which utilizing a single hydraulic fluid circuit each for extending and retracting all constituent hydraulic units. The fluid circuit for retraction of a remote hydraulic unit extends through intervening, primary hydraulic unit(s), and, after retraction of the remote hydraulic unit, provides retraction oil flow to primary hydraulic unit(s). Control valves effect a prescribed sequence of extension and retraction of the constituent hydraulic units, without involving separate, external control apparatuses.