Method for introducing blowing air into glass container forming machine molds

Abstract

A method for intermittently delivering counterblow air to a gob glass at a formable temperature in a blank mold of an I.S. glass container forming machine being operated on the blow and blow process. The method utilizes a plunger having a fixed annular member with an enlarged recess at an inlet end and a valve seat at an upper end. The plunger has a sliding valve member with an annulus of the annular member, and the valve member has a stem portion and an enlarged vale seat portion at a free end thereof. Pressurized air is intermittently delivered to the recess of the annular member to urge a collar secured to the stem of a sliding valve of the plunger upwardly to unseat the valve portion from the seat of the annular member.

1 - 10 . (canceled)  
   
   
       11 . The method of introducing counterblow air into a gob of glass at a formable temperature in a blank mold of an I.S. glass container forming machine after the gob has settled in the blank mold, the method comprising: 
 providing a non-reciprocatable annular member, the annular member having a seat at an uppermost end thereof and an enlarged recess in a lowermost end thereof;    providing a sliding valve member with an enlarged valve portion at an uppermost end thereof and a stem extending downwardly from the valve portion, the sliding member being reciprocatable with respect to the annular member to move between a first position, where the valve portion seats against the seat of the annular member to block fluid flow through the annular member, and a second position, where the valve portion is unseated from the seat of the annular member to permit fluid flow through the annular member;    providing a collar on the stem of said sliding valve member to be reciprocatable with the sliding valve member with respect to the annular member, the collar being slidable within the recess of the annular member and having at least one fluid flow passage extending therethrough;    pressurizing the recess of the annular member with a fluid that acts on an underside of the collar to urge the collar upwardly, and thereby move the sliding valve member from the first position to the second position; and then    depressurizing the recess of the annular member to cause the sliding valve member to return, by gravity, to the first position.    
   
   
       12 . The method according to  claim 11  wherein the fluid is compressed air.