US 12,252,853 B2
Cylinder sequencing for a dual stage lift system for a snow wing
Benjamin J. Kovalick, Chillicothe, IL (US); Bruce Raymond Vahling, Urbana, IL (US); and Ernest Everett Stoops, Mt. Zion, IL (US)
Assigned to Caterpillar Inc., Peoria, IL (US)
Filed by Caterpillar Inc., Peoria, IL (US)
Filed on Feb. 16, 2022, as Appl. No. 17/651,333.
Prior Publication US 2023/0257951 A1, Aug. 17, 2023
Int. Cl. E01H 5/06 (2006.01); E02F 3/84 (2006.01); E02F 3/96 (2006.01)
CPC E01H 5/067 (2013.01) [E02F 3/844 (2013.01); E02F 3/961 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A lift assembly for a snow wing assembly of a motor grader, comprising:
a first lifting mechanism coupled to an undercarriage assembly of the motor grader, wherein the first lifting mechanism is configured to lift a moldboard of the snow wing assembly a first portion of a bench height associated with the moldboard via a first hydraulic cylinder;
a second lifting mechanism coupled to the first lifting mechanism and the moldboard, wherein the second lifting mechanism is configured to lift the moldboard of the snow wing assembly a second portion of the bench height via a second hydraulic cylinder, wherein the first hydraulic cylinder and the second hydraulic cylinder are included in a hydraulic circuit; and
one or more valves included in the hydraulic circuit, configured to divert a flow of hydraulic fluid in the hydraulic circuit away from a first stage hydraulic cylinder, wherein the first stage hydraulic cylinder is one of the first hydraulic cylinder or the second hydraulic cylinder, and to a second stage hydraulic cylinder, wherein the second stage hydraulic cylinder is the other one of the first hydraulic cylinder or the second hydraulic cylinder, based on a pressure value associated with the first stage hydraulic cylinder satisfying a threshold.