Double piston welding cylinder

Claim 1

FLUID MOTOR APPARATUS COMPRISING A FLUID MOTOR AND FLUID CONDUIT MEANS; SAID MOTOR COMPRISING A CYLINDRICAL HOUSING; A FIRST RECIPROCABLE PISTON IN SAID HOUSING; A FIRST FLUID INLET BEHIND SAID PISTON TO ALLOW FLUID CONTACT WITH THE REAR FACE THEREOF; THE FRONT PORTION OF SAID PISTON FORMING A SECOND CYLINDER; A SECOND PISTON IN SAID SECOND CYLINDER AND RECIPROCABLE THEREIN; A SECOND FLUID INLET MEANS BEHIND SAID FIRST PISTON, SAID SECOND INLET MEANS INCLUDING A SECTION OF TUBING AFFIXED TO SAID HOUSING AND EXTENDING AXIALLY THROUGH SAID FIRST PISTON TO ALLOW FLUID CONTACT WITH THE REAR OF SAID SECOND PISTON; AND A RIGID FLOATING GLAND BETWEEN SAID PISTON AND SAID CONDUIT; SAID GLAND CONTAINING A RESILIENT RADIALLY POSITIONED ANNULAR SEAL TO SEAL SAID GLAND TO SAID CONDUIT, AND A RESILIENT AXIALLY POSITIONED ANNULAR SEAL TO SEAL SAID GLAND TO SAID PISTON; SAID SEALS BEING IN SLIDING CONTACT WITH THE ADJACENT SURFACE TO ASSURE A LEAKPROOF SEAL EVEN THROUGH SAID PISTON IS MISALIGNED WITH RESPECT TO SAID CONDUIT; SAID CONDUIT MEANS COMPRISING A PRIMARY FLUID SUPPLY LINE; A FIRST SECONDARY SUPPLY LINE BETWEEN SAID PRIMARY LINE AND SAID FIRST FLUID INLET; A SECOND SECONDARY SUPPLY LINE EXTENDING BETWEEN SAID PRIMARY LINE AND SAID SECOND INLET MEANS, AND VALVE IN EACH OF SAID SECONDARY LINES TO CONTROL THE PRESENCE OF A FLUID UNDER ONE PREDETERMINED PRESSURE ADJACENT SAID PISTONS.