Master cylinder construction affording automatic re-phasing of master and slavecylinders

Abstract

6. A hydraulic actuator assembly comprising: An elongated cylinder; First and second longitudinally spaced fluid inlet and outlet fittings in the cylinder wall; First and second longitudinally spaced fluid inlet and outlet ports through the cylinder wall communicating respectively with the first and second inlet and outlet fittings; First and second longitudinally spaced fluid escape orifices through the cylinder wall communicating respectively with the first and second inlet and outlet fittings, one orifice adjacent each of said ports, the longitudinal spacing between the orifices being less than the longitudinal spacing between said ports, and the fittings, ports and orifices being in substantial longitudinal alignment along the cylinder wall; A piston having limited reciprocable movement in the cylinder; and An annular seal or packing carried by the piston for sealing between the piston and the internal wall of the cylinder, and for thus dividing the cylinder into first and second fluid pressure chambers, The location of the piston at each end of its permitted stroke and the spacing between and location of the ports and the orifices being so related, each to the other, that: A. when the piston is at one end of its stroke the piston seal is located between the first port and the adjacent first orifice, the first cylinder chamber is in open communication with the first fitting through the first port, and the second cylinder chamber is in restricted communication with the first fitting through said first orifice; and B. when the piston is at the other end of its permitted stroke the piston seal is located between the second port and the adjacent second orifice, the second cylinder chamber is in open communication with the second fitting through the second port, and the first cylinder chamber is in restricted communication with the second fitting through the second orifice.

Having described the invention with sufficient clarity to enable those familiar with this art to construct and use it, I claim: .[.1. A hydraulic actuator assembly comprising: 
     
        outward only through the respective orifices..].  6. A hydraulic actuator assembly comprising: an elongated cylinder;   first and second longitudinally spaced fluid inlet and outlet fittings in the cylinder wall;   first and second longitudinally spaced fluid inlet and outlet ports through the cylinder wall communicating respectively with the first and second inlet and outlet fittings;   first and second longitudinally spaced fluid escape orifices through the cylinder wall communicating respectively with the first and second inlet and outlet fittings, one orifice adjacent each of said ports, the longitudinal spacing between the orifices being less than the longitudinal spacing between said ports, and the fittings, ports and orifices being in substantial longitudinal alignment along the cylinder wall;   a piston having limited reciprocable movement in the cylinder; and   an annular seal or packing carried by the piston for sealing between the piston and the internal wall of the cylinder, and for thus dividing the cylinder into first and second fluid pressure chambers,   the location of the piston at each end of its permitted stroke and the spacing between and location of the ports and the orifices being so related, each to the other, that: (a) when the piston is at one end of its stroke the piston seal is located between the first port and the adjacent first orifice, the first cylinder chamber is in open communication with the first fitting through the first port, and the second cylinder chamber is in restricted communication with the first fitting through said first orifice; and   (b) when the piston is at the other end of its permitted stroke the piston seal is located between the second port and the adjacent second orifice, the second cylinder chamber is in open communication with the second fitting through the second port, and the first cylinder chamber is in restricted communication with the second fitting through the second orifice. .Iadd. 7. The actuator described in claim 6, wherein the inlet and outlet fittings have an inside diameter overlapping its associated port and escape orifice which are in fluid communication..Iaddend..Iadd. 8. The actuator described in claim 6 wherein the inlet and outlet fittings each comprise a cylindrical sleeve having an inside diameter overlapping its associated port and escape orifice which are in fluid communication. .Iaddend. .Iadd. 9. The actuator described in claim 6 wherein the inlet and outlet fittings each comprise a cylindrical sleeve welded to the cylinder wall having an inside diameter overlapping its associated port and escape orifice which are in fluid communication. .Iaddend. .Iadd. 10. The actuator described in claim 6, wherein the escape orifices are of a diameter less than the width of the annular seal. .Iaddend. .Iadd. 11. The actuator described in claim 6, wherein the distance between each of said ports and its associated escape orifice is greater than the width of the annular seal. .Iaddend.