Agricultural implement end frames lift means

Claim 1

In combination with an agricultural implement having a central frame and a first oil hydraulic piston and cylinder operative to hydraulically lift said central frame, and having a pair of end frames pivotally connected to said central frame to pivot relative to said central frame, means for raising and lowering said end frames, comprising: a. flexible tension member means connected to said end frames in a manner whereby said end frames can be pivoted and raised relative to said central frame by a pulling force from said flexible tension member means, b. a second oil hydraulic piston and cylinder mounted on said implement and connected to said flexible tension member means and operative thereby to raise and lower said end frames relative to said central frame upon extension and retraction of said second piston, c. a source of oil hydraulic fluid under pressure, first and second fluid connecting means between said source and said hydraulic cylinders on first and second sides respectively of said hydraulic pistons, said first sides of said pistons being the sides operative when pressurized to lift said central frame and to raise said end frames relative to said central frame, and valve means in said first fluid connecting means operative by implement operator operation upon his election to block application of hydraulic pressure from said source to said first side of said second hydraulic piston whereby said central frame can be lifted when desired without raising said end frames relative to said central frame, and d. said second cylinder being disposed upright and having an upwardly directed piston rod, said second cylinder being generally cylindrical in shape and an upright tube with an open upper end removable receiving said second cylinder and closely fitting the same whereby said tube serves the function of a housing and is not itself a hydraulic cylinder.