Patent ID: 7717025
Filing Date: 2010-05-18
Classification: F15B

Abstract:
1. A fluid actuator with adjustable limits comprising: a. a cylinder, b. a main piston inside said cylinder, c. a means of transferring mechanical load to said main piston extending out of one or both ends of said cylinder, d. one or more additional pistons, e. fluid between said additional pistons and said main piston, and f. a means of using said fluid with one or more said additional pistons to adjust the extension and/or retraction limits of said main piston and/or resisting force applied on said main piston, whereby the extension and/or retraction limits of said main piston inside said cylinder are adjustable by the amount of incompressible said fluid between one or more said additional pistons and said main piston, whereby as said main piston inside said cylinder approaches the extension limit, its extension speed and/or applied force is controlled by an adjustable amount according to the amount of compressibility of said fluid between one or more said additional pistons and said main piston inside said cylinder, whereby as said main piston inside said cylinder approaches the retraction limit, its retraction speed and/or applied force is controlled by an adjustable amount according to the amount of compressibility of said fluid between one or more said additional pistons and said main piston inside said cylinder.