Motors: expansible chamber type – With motive fluid valve – Pilot valve
Patent
1993-05-25
1994-10-11
Michalsky, Gerald A.
Motors: expansible chamber type
With motive fluid valve
Pilot valve
91464, 1376256, 1376362, 251297, F15B 1306, F15B 13042
Patent
active
053536860
ABSTRACT:
A hydraulic circuit, having a four-position closed-center valve (6) controlled by a proportional control valve (22), can facilitate the vertical position control and operating speed control of a blade with a simple structure, while providing that the floating condition of the blade can be precisely recognized by the position of a control lever (20a). The spool (41) of the four-position selector valve (6) has a "hold" position which is given by the closed-center position. Opposite ends of the spool (41) receive a pilot pressure from the pressure proportional control valve (22), one position being obtained by applying pilot pressure to a first end of the spool (41), and two positions being obtained by applying pilot pressure to the second end of the spool (41). One of the latter two positions is a "floating" position, while the other two positions are the "up" position and the "down" position. The control lever (20a) for the pressure proportional control valve (22) can have a detent device for fixing the control lever at the "floating" position.
REFERENCES:
patent: 2958233 (1960-11-01), Johnson
patent: 3160174 (1964-12-01), Schmiel et al.
patent: 4342335 (1982-08-01), Reinicker et al.
patent: 4354527 (1982-10-01), McMillan
patent: 4355660 (1982-10-01), Huffman
patent: 4397336 (1983-08-01), Godfrey
patent: 5038825 (1991-08-01), Hilmer et al.
Kabushiki Kaisha Komatsu Seisakusho
Michalsky Gerald A.
LandOfFree
Hydraulic circuit for four-position closed-center selector valve 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 circuit for four-position closed-center selector valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic circuit for four-position closed-center selector valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1651792