Fastener driving device

14:

• The fastener driving device of claim 13, wherein the pressure chamber comprises an exhaust configured to release pressurized gas after the fastener has been driven from the fastener driving device, and wherein when force of the compressed gas in the sleeve acting upon the second piston exceeds force of the gas in the pressure chamber acting upon the first piston, the second piston acts against the first piston to slide the first piston towards the first position.

15:

• The fastener driving device of claim 14, which comprises an additional chamber fluidically linked to the sleeve, the additional chamber configured to house compressed gas from the sleeve.

16:

• The fastener driving device of claim 15, wherein the additional chamber is parallel to or surrounds the sleeve.

17:

• The fastener driving device of claim 16, wherein gas within the sleeve or the additional chamber is pressurized above atmospheric pressure when the first piston is in the second position.

18:

• The fastener driving device of claim 17, which includes a nose portion and wherein the second piston and sleeve are positioned on the nose portion.

19:

• The fastener driving device of claim 18, wherein the second piston and sleeve are mounted on or parallel to the fastener channel.

20:

• The fastener driving device of claim 19, wherein the sleeve defines a rebalancing hole, wherein the first piston is configured to occlude the rebalancing hole when in the second position, and wherein the rebalancing hole is open when the first piston is in the first position to couple the sleeve to outside of the fastener driving device.

21:

• The fastener driving device of claim 20, wherein the pressure chamber is coupled to a pressurized gas reservoir configured to selectively pressurize the pressure chamber to drive the first piston from the first position to the second position.

22:

• The fastener driving device of claim 21, which is a combustion fastener driving device, and wherein combustion gas expansion within the pressure chamber drives the first piston from the first position to the second position.

23:

• The fastener driving device of claim 22, wherein the pressure chamber is coupled to the sleeve such that expanded combustion gas can be supplied to the sleeve to increase the gas pressure in the sleeve.

24:

• The fastener driving device of claim 23, wherein the pressure chamber is coupled to the sleeve via a one-way valve.

25:

• The fastener driving device of claim 13, which comprises an additional chamber fluidically linked to the sleeve, the additional chamber configured to house compressed gas from the sleeve.

26:

• The fastener driving device of claim 25, wherein the additional chamber is parallel to or surrounds the sleeve.

27:

• The fastener driving device of claim 26, wherein gas within the additional chamber is pressurized above atmospheric pressure when the first piston is in the second position.

28:

• The fastener driving device of claim 13, wherein gas within the sleeve is pressurized above atmospheric pressure when the first piston is in the second position.

29:

• The fastener driving device of claim 13, which includes a nose portion and wherein the second piston and sleeve are positioned on the nose portion.

30:

• The fastener driving device according to claim 29, wherein the second piston and sleeve are mounted on or parallel to the fastener channel.

31:

• The fastener driving device of claim 13, wherein the sleeve defines a rebalancing hole, wherein the first piston is configured to occlude the rebalancing hole when in the second position, and wherein the rebalancing hole is open when the first piston is in the first position to couple the sleeve to outside of the fastener driving device.

32:

• The fastener driving device of claim 13, wherein the pressure chamber is coupled to a pressurized gas reservoir configured to selectively pressurize the pressure chamber to drive the first piston from the first position to the second position.