Gate valve

Claim 1

A GATE VALVE, FOR USE IN A PRESSURE LINE, COMPRISING AN OUTER HOUSING, PROVIDED WITH APERTURES FOR RECEIPT OF SAID LINE; A SECOND HOUSING CONTAINED IN SAID FIRST HOUSING; MOTOR MEANS, SECURED TO ONE END OF SAID OUTER HOUSING; OPERABLY CONNECTED WITH SAID SECOND HOUSING FOR MOVEMENT OF SAID SECOND HOUSING; A MOVABLE GATE VALVE ASSEMBLY, DISPOSED INSIDE SAID SECOND HOUSING, HAVING A GATE PLATE, A RAKE-SHAPED MEMBER POSITIONED ADJACENT SAID GATE PLATE, A PLURALITY OF ROLLERS SECURED TO ONE END OF SAID RAKE-SHAPED MEMBER, AN APERTURED SECTION, AND A PLATE ADJACENT SAID GATE PLATE AND RIGIDLY CONNECTED TO SAID INNER HOUSING, SAID PLATE BEING PROVIDED WITH A CUTOUT PORTION DISPOSED FOR RECEIVING SAID RAKE-SHAPED MEMBER AND SAID ROLLERS; CONNECTOR MEANS, CONNECTING SAID VALVE ASSEMBLY TO SAID MOTOR, FOR MOVING SAID VALVE ASSEMBLY TO A FIRST POSITION WHEREIN SAID GATE PLATE IS POSITIONED FOR REGISTRY WITH AND RESTRICTION OF SAID PRESSURE LINE AND FOR MOVING SAID VALVE ASSEMBLY TO A SECOND POSITION, WHEREIN SAID APERTURED SECTION IS IN CONNECTION WITH SAID PRESSURE LINE; MEANS FOR PREVENTING FRICTIONAL ENGAGEMENT BETWEEN SAID FIRST HOUSING AND SAID SECOND HOUSING DURING MOVEMENT OF SAID SECOND HOUSING; MEANS PROVIDING A FORCE FOR BIASING SAID GATE PLATE AWAY FROM SAID POSITION OF RESTRICTION OF SAID PRESSURE LINE; AND MEANS FOR OVERCOMING THE FORCE OF SAID BIASING MEANS AND THE FORCE IN SAID PRESSURE LINE TO MAINTAIN SAID GATE PLATE IN SAID POSITION OF REGISTRY WITH AND RESTRICTION OF SAID PRESSURE LINE.