Patent ID: 7614394

Claim:
A pneumatic toy gun, comprising a pneumatic assembly and an air valve, wherein the pneumatic assembly includes: an air intake duct to receive high pressure gas; a first duct which has an open end, an air outlet communicating with exterior and a detent block located inside; a rear push rod located in the first duct to form a first gas chamber between the first duct and thereof, the first gas chamber having a first thrust surface, the first gas chamber and the air intake duct communicating with each other through control of an air valve; a front push rod which is located in front of the rear push rod and coupled with a first sealing element on the periphery thereof, and has a recess and an air discharge passage inside communicating with the open end of the first duct, the air discharge passage having a rear end sealed by the rear push rod, the first duct and the front push rod forming a second gas chamber communicating with the air intake duct, the second gas chamber having a second thrust surface which is smaller than the first thrust surface; and a harness element to confine two sides of the first sealing element; wherein the second gas chamber communicates with the air outlet through the recess when the front push rod is moved relative to the first sealing element such that the recess is located beneath the first sealing element and an instant pressure loss occurs while the detent block interferes with the rear push rod, wherein the air valve includes: a valve body which has a first connection port, a second connection port and a first slide flute, the first connection port communicating with the air intake duct, the valve body having a first valve seat located inside; a first valve disc which is connectable to the first valve seat to block communication between the first connection port and the second connection port, and has a rear end extended to form a second duct which has a tail end with a first slide element located thereon, the first slide element being in contact with the first slide flute by sliding and coupled with a second sealing element on the periphery thereof, the first sliding flute being divided by the first slide element to form a third gas chamber and a fourth gas chamber; and a valve stem which runs through the second duct and has a tail end partly exposed outside the valve body, and an outer diameter smaller than the inner diameter of the second duct, and a head having an outer diameter greater than the inner diameter of the second duct, the head pressing the first valve disc such that when the valve stem is moved forwards the head is separated from the first valve and high pressure gas flown through the first connection port flows through the second duct into the third gas chamber.