Motors: expansible chamber type – Cyclically operable – Working member controlled motive fluid for distributor motor
Patent
1989-03-03
1990-08-21
Look, Edward K.
Motors: expansible chamber type
Cyclically operable
Working member controlled motive fluid for distributor motor
91303, 91304, 91313, 91420, F01L 2502
Patent
active
049496239
ABSTRACT:
Hydraulic drive mechanism for a machine element with rapid feed movement and under-load feed movement, comprising a double-acting hydrocylinder power drive and a pressure switching valve responding to the pressure at least in a larger operating chamber of the hydrocylinder when the pressure in the operating chamber exceeds a threshold value higher than 1/4 of the operating pressure of the pressure supply source, but lower than half the operating pressure thereof, switches to under-load feed operation and, when the pressure in the drive pressure or operating chamber falls below the threshold value, switches back to rapid feed operation. The pilot valve for the main control valve is equipped with two windings effective in opposite directions. A switching device is included which, in a position- or time-controlled fashion, excites the second control winding, and a return signaling stop is provided which brings about, in the point of reversal of the piston movement of the hydrocylinder on the workpiece side, a mechanical switchover of the pilot valve into the position required for the retraction movement.
REFERENCES:
patent: 2803110 (1957-08-01), Chittenden
patent: 2974639 (1961-03-01), O'Connor et al.
patent: 3951042 (1976-04-01), Weiss
patent: 4184331 (1980-01-01), Bentley
Hartmann & Lammle GmbH & Co. KG
Look Edward K.
LandOfFree
Hydraulic drive mechanism 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 drive mechanism, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic drive mechanism will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1669136