Apparatus and method for precision metering and deposit of viscous materials

Claim 1

IN AN INJECTOR FOR ONE-HAND PRECISION METERING AND DEPOSIT OF VARIABLE QUANTITIES OF VISCOUS MATERIAL, THE COMBINATION WITH AN AIR PRESSURE VALVE UNIT HAVING AN AIR INLET CONNECTED TO A SOURCE OF AIR UNDER PRESSURE, AN OUTLET, AND MEANS FOR CONTROLLING FLOW OF AIR UNDER PRESSURE FROM SAID AIR INLET TO SAID AIR OUTLET; OF A CARTRIDGE OF A SIZE AND SHAPE SUITABLE FOR ENGAGEMENT AND MANEUVER BY HAND AND INCLUDING A HOUSING PORTION PROVIDING A RESERVOIR FOR RECEIVING A CHARGE OF VISCOUS MATERIAL AND A VALVELESS NOZZLE PORTION RIGIDLY CARRIED ON SAID HOUSING PORTION AND PROVIDING AN ORIFICE DISCHARGE PASSAGE FOR SAID RESERVOIR, MEANS INCLUDING AN ELONGATED FLEXIBLE AIR SUPPLY TUBE HAVING ONE END CONNECTED IN SEALED AIR OUTLET AND HAVING THE OTHER END CONNECTED IN SEALED RELATION TO SAID HOUSING PORTION FOR SUPPLYING AIR UNDER PRESSURE INTO A REGION OF SAID RESERVOIR REMOTE FROM SAID NOZZLE PORTION TO EFFECT APPLICATION OF PRESSURE ON SAID CHARGE, AND TREADLE ACTUATED MECHANISM CONNECTED TO SAID CONTROLLING MEANS FOR CONTROLLING THE SUPPLY OF AIR UNDER PRESSURE TO SAID TUBE.