US 11,052,878 B2
Manually-operable hydraulic stabilizing system
Mark Kinder, Clarks Hill, IN (US); Robert L. Tiedge, Granger, IN (US); and Nicholas Cornett, Granger, IN (US)
Assigned to Lippert Components, Inc., Elkhart, IN (US)
Filed by Lippert Components, Inc., Elkhart, IN (US)
Filed on Aug. 15, 2019, as Appl. No. 16/541,220.
Application 16/541,220 is a continuation in part of application No. 16/196,949, filed on Nov. 20, 2018, granted, now 10,442,411.
Application 16/196,949 is a continuation in part of application No. 15/912,030, filed on Mar. 5, 2018, granted, now 10,688,972.
Claims priority of provisional application 62/478,271, filed on Mar. 29, 2017.
Claims priority of provisional application 62/513,766, filed on Jun. 1, 2017.
Prior Publication US 2019/0366985 A1, Dec. 5, 2019
Int. Cl. B60S 9/10 (2006.01); F15B 7/00 (2006.01)
CPC B60S 9/10 (2013.01) [F15B 7/003 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A hydraulic stabilizing system comprising:
a plurality of hydraulic stabilizing jacks, each of said jacks having an actuator comprising:
an actuator cylinder;
an actuator piston slidingly engaged with said actuator cylinder, said actuator piston cooperating with said actuator cylinder to define an actuator extend chamber and an actuator retract chamber;
an actuator piston rod connected to said actuator piston and selectively extendable from and retractable into said jack cylinder; and
one of a pilot-operated check valve and a pilot-operated directional valve having a first flow port connected to said actuator retract chamber in fluid communication therewith;
a fluid reservoir;
a fluid transfer pump having an input in fluid communication with said fluid reservoir, wherein said fluid transfer pump is one of a reciprocating pump and a gear pump;
a hydraulic line connecting an output of said pump with said one of said actuator retract chamber and said actuator extend chamber of at least one of said actuators and with a second flow port of said one of pilot-operated check valve and a pilot-operated directional valve of said at least one of said actuators; and
a control valve operable to selectively establish fluid communication between said first hydraulic line and said fluid reservoir.