Driver for power tools

1. A power tool driver comprising;

a receiving chamber;

a number of barrels, each barrel containing a plurality of discrete propellant charges for selective detonation whereby gases generated by the detonation of the propellant charge expand into the receiving chamber;

a reactive closure positioned in the receiving chamber which dynamically responds to the pressure changes in the receiving chamber; and

a linkage associated with the reactive closure for transmitting energy from the dynamic response of the reactive closure to the power tool.

2. The driver according to claim 1 , wherein the discrete propellant charges are contained in one of more cartridges including a tubular shell, a plurality of separator projectiles axially disposed within the shell for operative sealing engagement with the bore of the tubular shell.

3. The driver to claim 1 , wherein the propellant charge is in the form of a solid block.

4. The driver according to claim 1 , wherein the detonation is electronically controlled with respective propellant charges being associated with primers which are triggered by distinctive ignition signals.

5. The driver according to claim 1 , wherein the reactive closure is a diaphragm or a piston sealably engaged with the receiving chamber.

6. The driver according to claim 5 , wherein the diaphragm or piston is biased to a datum position.

7. The driver according to claim 1 , wherein the receiving chamber is detachably secured to a cartridge of barrel assemblies containing propellant charges.

8. The driver according to claim 1 , wherein the linking means is selected from the group consisting of a plunger, a rocker, a fluid pump and a transducer.

9. The driver according to claim 1 , wherein the propellant charge is encased in a rigid case.

10. The driver according to claim 7 , wherein the cartridge contains a cluster of barrel assemblies each containing a plurality of spaced charges separated by a respective projectile.

11. The driver according to claim 10 , wherein the projectiles each comprise two-part separator projectile containing a primer.

12. A driver according to claim 1 , the detonation of propellant being adapted to move the reactive closure from a retracted position to an extended position.

13. A driver according to claim 12 , the receiving chamber including a number of exhaust ports which allow gases to be expelled from the receiving chamber when the reactive closure is in the extended position.

14. A driver according to claim 12 , the driver including a spring for urging the reactive closure from the extended position to the retracted position.

15. A driver according to claim 1 , each barrel defining a barrel axis, and each barrel including a number of axially aligned projectiles.

16. A driver according to claim 1 , the driver including a control mechanism, the control mechanism being electrically coupled to a primer associated with each propellant charge, the control mechanism selectively igniting the primers to thereby selectively detonate the propellant charges.

17. A driver according to claim 16 , the control mechanism igniting the primers with distinctive electronic signals.

18. A driver according to claim 16 , the control mechanism simultaneously firing propellant charges from a number of barrels.

19. A driver according to claim 1 , the propellent charges being spaced by spacer projectiles, the spacer projectiles including complimentary wedge shaped portions adapted to form a seal with the barrel in response to the firing of a preceding propellant charge.

20. A driver according to claim 1 , the receiving chamber being adapted to receive debris from the detonation of the propellant charges.

21. A driver according to claim 20 , the receiving chamber including a collection chamber and a gate valve arranged such that debris in the receiving chamber passes through the gate valve into the collection chamber.