Single break oil circuit breaker structure having dual valve structure

Claim 1

A CHECK-VALVE STRUCTURE FOR THE INTERRUPTER STRUCTURE OF AN OIL CIRCUIT BREAKER; SAID INTERRUPTER STRUCTURE INCLUDING AN INTERRUPTER CONTAINER, STATIONARY CONTACT MEANS SECURED WITHIN SAID INTERRUPTER CONTAINER, MOVABLE CONTACT MEANS MOVABLE INTO AND OUT OF ENGAGEMENT WITH RESPECT TO SAID STATIONARY CONTACT MEANS AND A PUMP MEANS FOR FORCING FLUID UNDER PRESSURE INTO SAID INTERRUPTER CONTAINER RESPONSIVE TO MOVEMENT OF SAID MOVABLE CONTACT TO A DISENGAGED POSITION WITH RESPECT TO SAID STATIONARY CONTACT; SAID PUMP MEANS INCLUDING A PISTON AND A CYLINDER; SAID CYLINDER COMMUNICATING WITH THE INTERIOR OF SAID INTERRUPTER CONTAINER; SAID PISTON HAVING A PLURALITY OF OPENINGS CIRCULARLY DISTRIBUTED AROUND AN END WALL THEREOF; SAID PISTON HAVING AN ANNULAR CHECK-VALVE CONNECTED TO SAID END WALL MOVABLE INTO AND OUT OF SEALING ENGAGEMENT WITH SAID CIRCULARLY DISTRIBUTED OPENINGS; SAID ANNULAR CHECK-VALVE BEING MOVED TO ITS SAID SEALING ENGAGEMENT POSITION RESPONSIVE TO THE OPERATION OF SAID MOVABLE CONTACT TO SAID DISENGAGED POSITION; SAID CIRCULARLY DISTRIBUTED OPENINGS FORMING A CHANNEL FOR THE FLOW OF OIL INTO AND OUT OF SAID INTERRUPTER CONTAINER WHEN SAID MOVABLE CONTACT IS IN ENGAGEMENT WITH SAID STATIONARY CONTACT; AND A PLATE MEMBER FOR ENCLOSING THE TOP OF SAID INTERRUPTER CONTAINER AND THE BOTTOM OF SAID CYLINDER; SAID PLATE HAVING SECOND OPENINGS THEREIN FOR PERMITTING FLUID FLOW FROM SAID INTERRUPTER CHAMBER TO SAID CYLINDER; AND A SECOND CHECK VALVE; SAID SECOND CHECK VALVE BEING MOUNTED WITH RESPECT TO SAID PLATE FOR MOVEMENT INTO AND OUT OF SEALING ENGAGEMENT WITH RESPECT TO SAID SECOND OPENINGS; SAID SECOND CHECK VALVE BEING MOVABLE INTO ITS SAID SEALING ENGAGEMENT POSITION RESPONSIVE TO A HIGHER PRESSURE IN SAID INTERRUPTER CONTAINER THAN IN SAID CYLINDER; AND SAID SECOND CHECK VALVE BEING NORMALLY IN AN OPEN POSITION TO NORMALLY PERMIT CIRCULATION OF OIL THERETHROUGH.