A percussion mechanism for a gene gun comprising:
- a gun body having
- two sides;
- a rear;
- an outside surface;
- a trigger chamber being defined in the gun body and having an inner surface;
- a trigger hole being defined through the outside surface of the gun body and communicating with the trigger chamber;
- a tubular channel being defined longitudinally in the gun body above the trigger chamber and having
- a front end;
- a rear end;
- an inner surface;
- a valve seat being formed on and protruding radially in from the inner surface of the tubular channel near the front end of the tubular channel and having a central through hole defined coaxially through the valve seat;
- and
- an internal thread being formed on the inner surface of the tubular channel near the rear end of the tubular channel;
- a pivot hole being formed in the gun body, communicating with the tubular channel and the trigger chamber and having an inner surface;
- and
- a gas inlet port being formed through the outside surface of the gun body, communicating with the tubular channel;
- a percussion assembly being mounted in the tubular channel in the gun body and having
- a sleeve being mounted with an airtight fit in the tubular channel in the gun body and having a central guide hole defined axially through the sleeve;
- a pressure chamber being formed in the tubular channel between the valve seat and the sleeve and communicating with the gas inlet port;
- an adjusting plug being mounted adjustable in the rear end of the tubular channel and having
- an inner end;
- and
- an outer thread being formed around the adjusting plug at the inner end and screwing onto the internal thread in the tubular channel;
- an actuating chamber being formed in the tubular chamber between the sleeve and the adjusting plug and communicating with the pivot hole;
- a drive shaft mounted coaxially in the tubular channel to selectively close the valve seat and slidably through the central guide hole in the sleeve with an airtight fit and having
- a front end;
- a rear end;
- an annular flange being formed around and protruding radially out from the drive shaft near the rear end;
- and
- a valve disk being formed around and protruding out from the front end of the drive shaft, corresponding to the central through hole in the valve seat, selectively closing the central through hole and having an outer edge;
- a drive lever being mounted pivotally in and protruding from the pivot hole in the gun body and having
- an inner end extending into the actuating chamber and abutting the annular flange;
- and
- an outer end extending into the trigger chamber in the gun body;
- and
- a drive shaft spring being mounted between the rear end of the drive shaft and the adjusting plug and having
- a resilient force;
- a front end;
- and
- a rear end;
- and
- a trigger assembly being mounted in the trigger chamber and having
- a trigger being mounted pivotally in the trigger chamber, protruding from the trigger hole, activating the percussion mechanism when the trigger is squeezed and having
- an outer end protruding through the trigger hole and being squeezed to activate the percussion mechanism;
- and
- an inner end being mounted pivotally in the trigger chamber;
- a trigger spring being mounted integrally with the trigger in trigger chamber, biasing the outer end of the trigger forward and repositioning the trigger when the trigger is released;
- a hammer being mounted pivotally in the trigger chamber, pivoting the drive lever to pull the drive shaft away from the valve seat and having
- a distal end abutting the outer end of the drive panel in a default situation;
- and
- a proximal end being mounted pivotally in the trigger chamber near the inner end of the trigger, being pressed by the inner end of the trigger to pivot and cock the hammer when the trigger is pulled and driving forward and striking and pivoting the outer end of the drive lever;
- and
- a hammer spring being mounted integrally with the hammer in the trigger chamber and pivoting the hammer when the hammer is cocked and released by the trigger.