Title:
POWER LIFT
Document Type and Number:
WIPO Patent Application WO/2018/044871
Kind Code:
A8
Abstract:
Power machines (300) and control systems (360, 400) used thereon include a lift cylinder (333), a tilt cylinder (335), and a slave cylinder (337) mechanically connected to assist the lift cylinder with raising a boom (330). With a lift control valve (405) controlled to cause extension of the lift cylinder to raise the boom, pressure from a hydraulic source (362) is provided to the slave cylinder to aid in raising the boom. Resulting increased pressure on a side of the slave cylinder opens load holding valves (370, 460), allowing hydraulic pressure from the tilt cylinder to be communicated to the slave cylinder such that tilt cylinder pressure due to a heavy load on an implement aids in raising the boom.
Inventors:
GALES NICOLAS (FR)
Application Number:
PCT/US2017/049090
Publication Date:
April 05, 2018
Filing Date:
August 29, 2017
Export Citation:
Assignee:
CLARK EQUIPMENT CO (US)
International Classes:
E02F3/43; B66F7/22; B66F9/04; E02F9/20; E21B7/00
Attorney, Agent or Firm:
VELDHUIS-KROEZE, John et al. (US)
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