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Gas supply mechanism

  • US 4,694,850 A
  • Filed: 10/07/1986
  • Issued: 09/22/1987
  • Est. Priority Date: 10/11/1985
  • Status: Expired due to Term
First Claim
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1. A gas supply mechanism comprising a main body which has a hole therethrough on the axial line thereof containing a socket for a pressure cartridge on one end thereof and a second pressure chamber with a pressure modulating mechanism on the other end thereof, a nut screwed into said socket and around a top portion of said pressure cartridge to settle a packing disposed between the main body and said cartridge top portion, said packing having an O-ring part and a flat ringlike flange part on the periphery thereof, a piercing body having a needle projecting downwardly and into engagement with said packing at said cartridge top portion, said needle having a gas passage therethrough on the axial line thereof, a valve housing having a gas passage therethrough on the axial line thereof and having a cavity in which a sealing member is settled and an outer periphery on which communicates with said gas passage through a bypass at one end of and around said gas passage;

  • said hole in said body comprising midway therethrough a first portion which communicates with the second pressure chamber and through which a valve pin moves, a second portion which communicates with said first portion and which receives said valve housing, and a third portion which communicates with said second portion and into which said piercing body screws;

    said valve pin co-operating with said sealing member to make and cut off connections between said gas passage and said second pressure chamber, said packing being settled in said main body by said nut with its flange part on said piercing body and with its O-ring part being deformed around said needle and into engagement with said cartridge top portion when said needle pierces said cartridge top portion, to thereby provide an effective seal between said needle and said cartridge top portion.

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