Abrasive blasting apparatus

• US 3,089,285 A
• Filed: 04/19/1962
• Issued: 05/14/1963
• Est. Priority Date: 04/19/1962
• Status: Expired due to Term

• Current Assignee: Ralph W. Moore
• Original Assignee: Ralph W. Moore
• Inventors: Moore, Ralph W.
• Application Number:
  US04/188,744
• Time in Patent Office: 390 Days
• US Class Current: 451/2
• CPC Class Codes: B24C 7/0046 the abrasive material being fed in a gaseous carrier

Claims

1. A PRESSURE-RESPONSIVE MIXING DEVICE FOR CONTROLLING THE FLOW OF A STREAM OF PARTICLES FROM A SUPPLY TANK, SAID DEVICE INCLUDING A FLOW CONDUIT, A TUBULAR MEMBER HAVING ITS UPPER PORTION PROJECTING INTO THE CONDUIT AND PROVIDING A DISCHARGE PATH FOR THE CONDUIT, A RUBBER VALVE SEAT IN SAID CONDUIT ABOVE THE UPPER PORTION OF THE TUBULAR MEMBER, A SPRING FOR UPWARDLY BIASING THE TUBULAR MEMBER AGAINST THE VALVE SEAT, TWO SPACED PRESSURE-RESPONSIVE DIAPHRAGMS HOLDING THE TUBULAR MEMBER IN PLACE, AND A PRESSURE APPLYING CONNECTION FOR CAUSING CHANGES IN PRESSURE TO RAISE AND LOWER THE TUBULAR MEMBER AGAINST AND AWAY FROM THE VALVE SEAT, ONE OF SAID DIAPHRAGMS HAVING ONE FACE EXPOSED TO THE CONDUIT WHILE THE SECOND DIAPHRAGM HAS THE OPPOSITE FACE EXPOSED TO THE PRESSUREAPPLYING CONNECTION, THE TOTAL MOVING AREA OF THE SECOND