F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/71
F15B 11/16 (2006.01) B66C 23/00 (2006.01) E02F 3/70 (1980.01)
Patent
CA 1050395
ABSTRACT OF THE DISCLOSURE Greater overall speed of crane operation is made possible by using a plurality of hydraulic piston-cylinder sets together with valving which can direct the pumped hydraulic fluid selectively to either of the cylinder sets or to both of them. Preferably the two cylinder sets are of different speed-load characteristics so that the same supply of prepared oil will raise the boom faster when supplied to one than when supplied to the other. When the boom must be raised with maximum load, the same oil supply will be directed to both cylinder sets, thereby giving the maximum lifting power with a given available oil pressure and the slowest raising speed. The overall time required to accomplish a given task is reduced because most of the time the boom can be raised of lowered at a faster speed than that slow speed which must be provided for handling heaviest loads. Speeds are selected by operating one or both of two handles to the up or down position, each handle controlling its own valve spool. When only one handle is m wed to supply fluid under pressure, the other is moved to a "float" position. Each valve spool must therefore have a float position, but for safety an interlock prevents moving both spools to the float position simultaneously.
256014
LandOfFree
Hydraulic boom-lift system with selective speeds 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 boom-lift system with selective speeds, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulic boom-lift system with selective speeds will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1019957