A fastener driving apparatus comprises a gas spring or spring, a drive mechanism, an anvil assembly, and an anvil. The drive mechanism permits transition from engagement with the gas spring, spring or anvil assembly to disengagement from the gas spring, spring or anvil assembly. The anvil and/or anv
A fastener driving apparatus comprises a gas spring or spring, a drive mechanism, an anvil assembly, and an anvil. The drive mechanism permits transition from engagement with the gas spring, spring or anvil assembly to disengagement from the gas spring, spring or anvil assembly. The anvil and/or anvil assembly are operatively coupled to the gas spring or spring such that after the drive mechanism disengages them, the gas spring piston or the spring moves to imparts a force on the anvil to cause the anvil to move and drive a fastener. The mass of the anvil assembly is preferably greater than 50% of the total mass of the anvil assembly and gas spring moving mass. The gas spring is configured such that the pressure increase during the movement of the gas spring piston by the drive mechanism is less than 30% of the initial pressure in the gas spring.
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1. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a gas spring, said gas spring comprising a chamber and a piston disposed within said chamber,a drive mechanism capable of selectively engaging and disengaging said gas spring, said gas spring capable o
1. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a gas spring, said gas spring comprising a chamber and a piston disposed within said chamber,a drive mechanism capable of selectively engaging and disengaging said gas spring, said gas spring capable of moving to an energized position, upon being engaged by said drive mechanism,and an anvil assembly, said anvil assembly comprising an anvil,wherein said drive mechanism selectively engages said gas spring to apply a force on said gas spring to move said piston of said gas spring and thereafter disengages from and ceases applying a force on said gas spring,wherein when said drive mechanism engages said gas spring, potential energy is stored by said movement, and after said drive mechanism thereafter disengages said gas spring, said gas spring releases its potential energy and accelerates at least one of said anvil and said anvil assembly, at least one of said accelerated anvil and said accelerated anvil assembly then separating from said gas spring for a portion of the stroke to drive a fastener. 2. The fastener driving apparatus of claim 1, wherein the total stroke of said gas spring piston is no more than 70% of the total stroke of at least one of said anvil and said anvil assembly. 3. The fastener driving apparatus of claim 1, wherein the pressure change within the gas spring caused by movement of said gas spring piston is less than 50%. 4. The fastener driving apparatus of claim 1, wherein said control circuit further comprises at least one sensor, wherein said at least one sensor may determine at least one of the position of said anvil, the position of said anvil assembly, and the position of said drive mechanism. 5. The fastener driving apparatus of claim 1, wherein said drive mechanism comprises one of an interrupted friction wheel, a rack-and-pinion arrangement, and a cam. 6. The fastener driving apparatus of claim 1, wherein the moving mass within said gas spring is less than 80% of the moving mass of at least one of said anvil and said anvil assembly. 7. The fastener driving apparatus of claim 1, said apparatus further comprising at least one bumper for absorbing the impact of the gas spring moving mass. 8. The fastener driving apparatus of claim 1, wherein said anvil assembly further comprises a return mechanism for biasing said anvil to a position where said gas spring is proximate to said anvil. 9. The fastener driving apparatus of claim 1, wherein said gas spring further comprises a flange for retaining said piston of said gas spring, and said flange comprising an opening, wherein the area of said opening of said flange is at least 5% of the internal cross-sectional area of said gas spring. 10. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a gas spring, said gas spring comprising a chamber and a piston disposed within said chamber,a drive mechanism capable of selectively engaging and disengaging said gas spring, said gas spring capable of moving to an energized position, upon being engaged by said drive mechanism,and an anvil assembly, said anvil assembly comprising an anvil,wherein said drive mechanism comprises an engagement region for engaging and causing said gas spring to move said piston of said gas spring chamber and a non-engagement region for cause said drive mechanism to cease causing said gas spring to so move,wherein potential energy is stored by said movement of said piston, and after said drive mechanism thereafter disengages said gas spring, said gas spring accelerates at least one of said anvil and said anvil assembly, at least one of said accelerated anvil and said accelerated anvil assembly then separating from said gas spring to drive a fastener. 11. The fastener driving apparatus of claim 10, wherein the total stroke of said gas spring piston is no more than 70% of the total stroke of at least one of said anvil and said anvil assembly. 12. The fastener driving apparatus of claim 10, wherein the pressure change within the gas spring caused by movement of said gas spring piston is less than 50%. 13. The fastener driving apparatus of claim 10, wherein said control circuit further comprises at least one sensor, wherein said at least one sensor may determine at least one of the position of said anvil, the position of said anvil assembly, and the position of said drive mechanism. 14. The fastener driving apparatus of claim 10, wherein the moving mass within said gas spring is less than 80% of the moving mass of at least one of said anvil and said anvil assembly. 15. The fastener driving apparatus of claim 10, said apparatus further comprising at least one bumper for absorbing the impact of the gas spring moving mass. 16. The fastener driving apparatus of claim 10, wherein the pressure within the gas spring before the drive mechanism engages the gas spring is at least 200 psi. 17. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a spring,a drive mechanism capable of selectively engaging and disengaging said spring, said spring capable of moving to an energized position, upon being engaged by said drive mechanism,and an anvil assembly, said anvil assembly comprising an anvil,wherein said drive mechanism selectively engages said spring to apply a force on said spring to move said piston of said spring and thereafter disengages from and ceases applying a force on said spring,wherein when said drive mechanism engages said spring, potential energy is stored by said movement, and after said drive mechanism thereafter disengages said spring, said spring releases its potential energy and accelerates said anvil, said anvil then separating from said spring for a portion of the stroke to drive a fastener. 18. The fastener driving apparatus of claim 17, wherein said spring is one of a mechanical spring, a metal spring, a gas spring, an elastomer spring, and an elastomer. 19. The fastener driving apparatus of claim 17, wherein the total stroke of said spring is no more than 50% of the total stroke of at least one of said anvil and said anvil assembly. 20. The fastener driving apparatus of claim 16, said apparatus further comprising at least one bumper for absorbing the impact of the spring moving mass.
Leimbach, Richard L.; McCardle, Thomas A.; Bolender, Danny L.; Dickinson, Steve; Knueven, Joseph R.; Lance, Jr., Robert L.; Stoltz, Dan; Petrocelli, Michael V., Fastener driving tool using a gas spring.
Leimbach, Richard L.; Adams, Shane; Clark, Thomas W.; Petrocelli, Michael V.; Petrocelli, legal representative, Teresa, Method for controlling a fastener driving tool using a gas spring.
Sollberger Roger W. (5614 Beechmont Ave. Cincinnati OH 45230) Webb Walter J. (5117 Colerain Ave. Cincinnati OH 45223), Portable electric fastener driving apparatus.
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