Patent ID: 6782800
Filing Date: 2004-08-31
Classification: F15B

Abstract:
A fluid powered linkage, comprising:(a) four sides of substantially equal width and length joined by hinges to form a diamond of variable cross sectional area; (b) side plates to enclose a variable volume within the linkage, the variable volume bounded by inner surfaces of the sides and side plates; (c) at least one port to allow fluid to enter into or leave from the enclosed variable volume in a controllable manner; (d) one or more seals to prevent fluid from entering or leaving the enclosed variable volume other than through the one or more ports; and, (e) two abutments or connectors located substantially at the obtuse angles of the diamond on the sides or hinges, wherein the distance between the two abutments or connectors varies non-linearly with the variable cross-sectional area, and wherein at least one side rotates relative to another side as the cross-sectional area of the linkage varies.