Riveting gun with piston expels air to air chamber at piston travel ends to compress chamber air and return piston fast.

摘要

Two ports (120,121) at the ends of the valve chamber (10) connecting to the air chamber (12) bleed into this chamber to compress the chamber air and in so doing forcibly reciprocate the piston (3) in the air chamber. A seal (4) overlying the piston seals the air chamber off from the main air channel (11) when the seal is pressed to the chamber walls by channel (21) air and the included spring (24). Main channel (11) air is bled to the outside from the gun body (1). In a variant, the two bleed ports are linked by a connecting pipe, itself linked back to the valve chamber (10), in this case using the recurrent air compression in this pipe to reciprocate the piston (3).