Telescopic piston-cylinder assembly for hydraulic machines and machine components

Claim 1

A telescopic piston-cylinder assembly for use with a pressure fluid, comprising: a telescopic unit having first and second bearing surfaces formed on the opposite ends thereof; first and second reaction-force absorbing seat means respectively engaging said first and second bearing surfaces for supporting said unit; said first and second seat means having first and second seating surfaces, respectively, disposed in slidable bearing engagement with said first and second bearing surfaces, respectively, for permitting angular movement of said unit relative to at least one of said seating surfaces; said telescopic unit having a maximum cross-sectional pressure area defined by a predetermined diameter, and including a sleeve-like cylinder and a sleeve-like piston slidably received in said cylinder, the opposed ends of said cylinder and sleeve being axially overlapped, the other end of said cylinder and sleeve respectively having said first and second bearing surfaces thereon; passage means communicating with the interior of said unit for permitting pressure fluid to be supplied to the interior of said cylinder; and said one seating surface being provided with a convex spherical slide surface, and the corresponding one of said first and second bearing surfaces as disposed in engagement with said one seating surface having an internal conical configuration whereby it engages said slide surface substantially along a circular line of contact, said circular line of contact between said slide surface and the corresponding bearing surface having a diameter substantially equal to or only slightly smaller than said predetermined diameter.