Toy air gun

1. A toy gun, comprising:

a body;

a piston adapted to move relative to the body between an extended position and a retracted position and to be moved rapidly toward the retracted position during a firing stroke;

a plurality of firing chambers in a circular array and each adapted to receive a projectile and to receive air compressed by the piston during a said firing stroke to fire the projectile from the toy gun;

an air delivery mechanism adapted to convey the compressed air to one of the firing chambers and co-operating with the piston to advance as a result of piston movement to a configuration whereat it can convey compressed air to another of the chambers;

a pressure chamber situated between the firing chambers and the piston and via which the compressed air is conveyed to the firing chambers; and

the air delivery mechanism comprises a disc rotatable within the pressure chamber, the disc having a port with a check valve across it, the port aligned with one of the firing chambers, and means for rotatably indexing the disc to align the port with another one of the firing chambers.

2. The toy gun of claim 1 , further comprising a first handle extending from the body to be grasped by one hand and a second handle extending from the piston to be grasped by another hand.

3. The toy gun of claim 2 , further comprising a trigger associated with the first handle for releasing the piston.

4. The toy gun of claim 1 , wherein each firing chamber further comprises an ejection nozzle via which air compressed by the piston is delivered to a projectile during the firing stroke.

5. The toy gun of claim 1 , wherein the air delivery mechanism comprises a conduit extending from the pressure chamber to one of the firing chambers, and means for rotatably advancing the conduit to align the conduit with another one of the firing chambers.

6. A toy gun, comprising:

a body;

a piston adapted to move relative to the body between an extended position and a retracted position and to be moved rapidly toward the retracted position during a firing stroke;

a plurality of firing chambers in a circular array and each adapted to receive a projectile and to receive air compressed by the piston during a said firing stroke to fire the projectile from the toy gun,

an air delivery mechanism adapted to convey the compressed air to one of the firing chambers and co-operating with the piston to advance as a result of piston movement to a configuration whereat it can convey compressed air to another of the chambers;

a pressure chamber situated between the firing chambers and the piston and via which the compressed air is conveyed to the firing chambers; and

wherein the port includes a tube extending into the pressure chamber.

7. The toy gun of claim 6 , further comprising a seal for sealing the port against each firing chamber.

8. A toy gun, comprising:

a body;

a piston adapted to move relative to the body between an extended position and a retracted position and to be moved rapidly toward the retracted position during a firing stroke;

a plurality of firing chambers in a circular array and each adapted to receive a projectile and to receive air compressed by the piston during a said firing stroke to fire the projectile from the toy gun;

an air delivery mechanism adapted to convey the compressed air to one of the firing chambers and co-operating with the piston to advance as a result of piston movement to a configuration whereat it can convey compressed air to another of the chambers;

a pressure chamber situated between the firing chambers and the piston and via which the compressed air is conveyed to the firing chambers; and

wherein the air delivery mechanism comprises a disc adapted to move linearly within the pressure chamber and rotatable within the pressure chamber, the disc having a port aligned with one of the firing chambers, and means for rotatably indexing the disc to align the port with another one of the firing chambers.

9. The toy gun of claim 8 , wherein said means for rotatably indexing the disc comprises a substantially cylindrical hub fixed with respect to the body and a ring attached to or formed integrally with the disc and surrounding the hub, the hub having an array of indexing fingers, the ring having one or more cams which engage upon linear movement of the disc with one or more of the fingers to rotate the disc.

10. The toy gun of claim 8 , wherein the disc is biased by a spring toward the firing chambers.

11. A toy gun, comprising:

a body;

a piston adapted to move relative to the body between an extended position and a retracted position and to be moved rapidly toward the retracted position during a firing stroke;

a plurality of firing chambers each adapted to receive a projectile and to receive air compressed by the piston during a said firing stroke to fire the projectile from the toy gun;

an air delivery mechanism adapted to convey the compressed air to one of the firing chambers and co-operating with the piston to advance as a result of piston movement to a configuration whereat it can convey compressed air to another of the chambers;

a pressure chamber situated between the firing chambers and the piston and via which the compressed air is conveyed to the firing chambers;

the air delivery mechanism comprises a conduit extending from the pressure chamber to one of the firing chambers, and means for rotatably advancing the conduit to align the conduit with another one of the firing chambers; and

wherein said means for rotatably advancing the conduit comprises a substantially cylindrical hub fixed with respect to the conduit and a cam attached to the piston, the hub having an array of indexing fingers, the cam engaging upon movement of the piston with one or more of the indexing fingers to rotate the hub and conduit.