Trigger mechanism for toy blowgun

1. A trigger mechanism for a toy blowgun wherein the toy blowgun comprises:

a launching mechanism for launching a projectile from the toy blowgun; and

a locking mechanism for locking the launching mechanism in a primed configuration, the locking mechanism being releasable to launch the projectile from the toy blowgun;

and wherein the trigger mechanism comprises:

a trigger chamber having an inlet configured as a mouthpiece to receive a flow of air blown by a user; and

a shuttle movable from a start position to a launching position in the trigger chamber by the received flow of air blown by the user, wherein the shuttle engages the locking mechanism when the shuttle arrives at the launching position in order to release the locking mechanism.

2. A trigger mechanism according to claim 1 wherein the trigger chamber has one or more vents adjacent the launching position to facilitate the escape of air from the trigger chamber as the shuttle moves from the start position to the launching position.

3. A trigger mechanism according to claim 1 wherein the trigger chamber is a tube, the shuttle movable in a longitudinal direction along the tube, the tube having a transverse tube cross-section, and the shuttle having a transverse shuttle cross-section closely fitting within the transverse tube cross-section.

4. A toy blowgun comprising:

a launching mechanism for launching a projectile from the toy blowgun;

a locking mechanism for locking the launching mechanism in a primed configuration, the locking mechanism being releasable to launch the projectile from the toy blowgun;

a trigger mechanism comprising:

a trigger chamber having an inlet configured as a mouthpiece to receive a flow of air blown by a user; and

a shuttle movable from a start position to a launching position in the trigger chamber by the received flow of air blown by the user, wherein the shuttle engages the locking mechanism when the shuttle arrives at the launching position in order to release the locking mechanism.

5. A toy blowgun according to claim 4 comprising a projectile chamber for holding the projectile to be launched, wherein the launching mechanism comprises a pressurized air chamber having an exhaust port for exhausting pressurized air from the pressurized air chamber into the projectile chamber to allow the pressurized air to launch the projectile, and wherein the locking mechanism comprises an exhaust valve closeable to seal the exhaust port in the primed configuration, the trigger mechanism releasing the locking mechanism by opening the exhaust valve to unseal the exhaust port thereby allowing the exhaust port to exhaust pressurized air from the pressurized air chamber into the projectile chamber to allow the pressurized air to launch the projectile.

6. A toy blowgun according to claim 4 wherein the exhaust valve is connected to a piston inside the pressurized air chamber, the piston having a first side and a second side, the pressurized air chamber having a trigger port for exhausting pressurized air from the pressurized air chamber adjacent the second side, the locking mechanism comprising a trigger valve closeable to seal the trigger port in the primed configuration, the shuttle opening the trigger valve in the launching position to unseal the trigger port thereby allowing the trigger port to exhaust pressurized air from the pressurized air chamber adjacent the second side resulting in a higher pressure on the first side which moves the piston into the second side thereby opening the exhaust valve.

7. A toy blowgun according to claim 5 wherein the pressurized air chamber is sleeved into the trigger chamber such that sliding the pressurized air chamber into the trigger chamber forces air into the pressurized air chamber, thereby pressurizing air inside the pressurized air chamber.

8. A toy blowgun according to claim 7 wherein the pressurized air chamber comprises a priming port for receiving air from the trigger chamber into the pressurized air chamber, and a priming valve closeable to seal the priming port in the primed configuration and openable as air is forced against the priming valve when the pressurized air chamber is slid into the trigger chamber.

9. A toy blowgun according to claim 8 wherein the trigger port is also the priming port and the trigger valve is also the priming valve, the trigger valve openable as air is forced against the trigger valve when the pressurized air chamber is slid into the trigger chamber.

10. A toy blowgun according to claim 7 wherein the shuttle seals the inlet when in the start position.

11. A toy blowgun according to claim 5 wherein the exhaust valve is closed by the pressurized air.

12. A toy blowgun according to claim 4 comprising a projectile chamber for holding the projectile to be launched, wherein the launching mechanism comprises a pressurized air chamber having an exhaust port for exhausting air from the pressurized air chamber into the projectile chamber to allow the air to launch the projectile, an air ram movable from a first end of the pressurized air chamber opposite the exhaust port towards the exhaust port to force air through the exhaust port from the pressurized air chamber into the projectile chamber to allow the air to launch the projectile, a resilient biasing means biasing the air ram towards the exhaust port, and wherein the locking mechanism holds the air ram against the resilient biasing means at the first end of the pressurized air chamber in the primed configuration.

13. A toy blowgun according to claim 12 wherein the locking mechanism comprises a catch to hold the air ram against the resilient biasing means at the first end, the shuttle releasing the catch in the launching position.

14. A toy blowgun according to claim 12 wherein the launching mechanism comprises a manual actuator sleeved over the pressurized air chamber and connectable to the air ram such that applying a sliding force to slide the manual actuator away from the exhaust port moves the air ram away from the exhaust port against the resilient biasing means to the first end to be held by the locking mechanism in the primed configuration.

15. A toy blowgun according to claim 14 wherein the launching mechanism comprises a second resilient biasing means to move the manual actuator back towards the exhaust port once the sliding force is removed.