Hydraulic cyliner systems with safeguarded float action

Details Hydraulic cyliner systems with safeguarded float action Hydraulic cyliner systems with safeguarded float action

1975-03-17

1977-04-19

Spar, Robert J.

91447, E02F 370

Patent

active

040183505

ABSTRACT:
The invention may be used with a boom or the like which is raised and lowered by double-acting hydraulic cylinder means provided with a pilot-actuated safety valve at its bottom such that the boom can only go down when pilot pressure (normally from the downthrust line) is applied to this safety valve. The main manual valve has a four-position spool which provides a float position reached by moving through the lowering position. As the main valve is moved to the float position, its manual actuation mechanism actuates an auxiliary valve to supply pilot pressure to the safety valve to open the safety valve to allow the cylinder to achieve the desired floating action. This pilot pressure supply is through a shuttle valve which alternatively lets pilot pressure be applied to this safety valve as here stated or, from the downthrust, without ever connecting the two sources.

REFERENCES:
patent: 3381587 (1968-05-01), Parquet
patent: 3454176 (1969-07-01), Landeborg et al.
patent: 3613508 (1971-10-01), Krehbiel et al.
patent: 3788401 (1974-01-01), Scheidt et al.
patent: 3908515 (1975-09-01), Johnson

Affiliated with

Also associated with

Rating

Hydraulic cyliner systems with safeguarded float action does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Hydraulic cyliner systems with safeguarded float action, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic cyliner systems with safeguarded float action will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-98746