Hydraulic type brake apparatus

Details Hydraulic type brake apparatus Hydraulic type brake apparatus

2005-03-29

2005-03-29

Lopez, F. Daniel (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C060S466000

Reexamination Certificate

active

06871494

ABSTRACT:
The present invention relates to a hydraulic type brake system which includes a unit for adjusting a back pressure in a turn driving hydraulic circuit mounted in a construction heavy equipment such as an excavator, etc., and in particular to a hydraulic type brake apparatus which is used together with a relief valve installed various actuator driving hydraulic circuits for adjusting a back pressure in a lower flow side of a relief valve for thereby adjusting an opening pressure of a relief valve. There is provided a back pressure adjusting unit adapted to adjust an opening pressure of the relief valve by adjusting a back pressure of the hydraulic circuit in a lower flow portion of the relief valve based on a co-operation with the actuator.

REFERENCES:
patent: 5197284 (1993-03-01), Cartner
patent: 5325944 (1994-07-01), Livingston, Sr.
patent: 5566795 (1996-10-01), Barefoot
patent: 2526154 (1976-12-01), None
patent: 19713592 (1998-10-01), None
patent: 2 112 910 (1983-07-01), None
patent: 2000130403 (2000-05-01), None
English Abstract of DE 19713592 dated Oct. 8, 1998.
English Abstract of DE 2526154 dated Dec. 16, 1976.
English Abstract of JP 2000-130403 dated May 12, 2000.

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