Hydraulic powered arm system with float control

Details Hydraulic powered arm system with float control Hydraulic powered arm system with float control

2005-09-06

2005-09-06

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

C060S494000, C060S464000

Reexamination Certificate

active

06938414

ABSTRACT:
The present invention relates to a hydraulically powered arm system with a hydraulic circuit, which hydraulic circuit (L) comprises a pressure source (6) and a lifting cylinder (1) arranged to an arm which is intended for handling a tool, said hydraulic circuit (L) comprising a partial circuit (45A,45B), which can be connected into communication with said pressure cource (6) by means of a first valve element (44) and said lifting cyliner (1) by means of a second valve element (43), characterised in that said partial circuit (45A,45B) comprises a pressure reducing/relieving unit (4) whichis arranged between said valve elements (43, 44), and that said pressure reducing/relieving unit (4) is controlled by a pressure controlling unit (62A) in order to facilitate float control of the tool attached to the arm system, whereby a controlled ground pressure is obtained during the a floating motion.

REFERENCES:
patent: 4646518 (1987-03-01), Hochsattel
patent: 5560733 (1996-10-01), Dickinson
patent: 6584769 (2003-07-01), Bruun
patent: 6789387 (2004-09-01), Brinkman
patent: 6804957 (2004-10-01), Bruun
patent: WO 00/00748 (2000-01-01), None
patent: WO 01/48387 (2001-07-01), None
Copy of International Search Report.

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