Firing apparatus for an airsoft gun

An apparatus for controlling the firing of an airsoft gun comprising, in combination:

• a butt (1) including a chamber (10);
• a first line (13) including a first port (12) communicating with a high pressure air canister (60) releasably secured to an underside of the butt (1), and a second port (14) communicating with a rear section (15) of the chamber (10);
• a valve (4) disposed under the butt (1) and including a stem (41) and a third port (40);
• a second line (16) communicating with the first port (12) and the third port (40);
• a third line (42) communicating with the third port (40) and a fourth port (17) in the butt (1);
• a firing mechanism (2) disposed in the chamber (10) and including a sleeve (20) and a plunger (30);
• a trigger (3) operatively connected to the stem (41);
• an annular intermediate member (32) of the plunger (30) positioned in the intermediate cylinder (50);
• a stop member (5) disposed on an intermediate portion of the plunger (30);
• an annular fourth flange (33) disposed in a rear portion of the plunger (30);
• a rear annular first flange (21) of the sleeve (20) disposed on an intermediate cylinder (50) in the chamber (10);
• a first portion (191) and a second portion (192) adjacent to the first portion (191) disposed in the rear section (15) of the chamber (10);
• a push rod (24) disposed in a front portion of the chamber (10);
• and
• a circular member (23) formed at a forward end of the sleeve (20) and releasably secured to the push rod (24);
• wherein in a pressurized air supplying operation:
• pressurized air leaving the high pressure air canister (60) flows to the rear section (15) of the chamber (10) via the first line (14) and a forward section (18) of the chamber (10) via the second line (16), the third port (40), the third line (42), and the fourth port (17) respectively;
• the rear annular first flange (21) of the sleeve (20) is pushed rearward by the pressurized air in the forward section (18) until being stopped by an annular second flange (51) in a rear end of the intermediate cylinder (50);
• the pressurized air flows to an annular third flange (31) of the plunger (30) to push the plunger (30) rearward via a fifth port (22) of the sleeve (20) and an orifice (52) of the intermediate cylinder (50);
• the pressurized air leaving the rear section (15) of the chamber (10) flows to an adjacent reservoir (150);
• the plunger (30) is stopped from moving rearward when the pressurized air reaches the intermediate member (32) of the plunger (30);
• and
• a plastic pellet (6) brought to a front end of the chamber (10);
• and
• wherein in a firing operation:
• a pressing of the trigger (3) pushes the stem (41) rearward to close the valve (4) and block the second line (16) so that a portion of the pressurized air in the chamber (10) and the pressurized air in the third line (42) exit the valve (4) via the third port (40);
• the pressurized air in the rear section (15) of the chamber (10) pushes the plunger (30) forward until the second port (14) is blocked by the first portion (191);
• the pressurized air in the reservoir (150) passes through a plurality of orifices (34) in the fourth flange (33) to reach a tunnel (35) in front of the plunger (30);
• the pressurized air enters a tunnel (53) in the intermediate cylinder (50);
• the pressurized air pushes both the push rod (24) and the sleeve (20) forward;
• the plastic pellet (6) is pushed to a ready to fire position in front of the chamber (10) by the pressurized air passing through a space (25) around the push rod (24) and a plurality of holes (26) through the circular member (23);
• and
• the pressurized air propels the plastic pellet (6) out of the butt (1) to fire.