A fastener driving apparatus includes a drive mechanism, a drive piston disposed with in a cylinder and operatively coupled to the drive mechanism, and an anvil coupled to the drive piston. The apparatus also preferably comprises a biasing element for temporarily holding the drive piston at BDC of t
A fastener driving apparatus includes a drive mechanism, a drive piston disposed with in a cylinder and operatively coupled to the drive mechanism, and an anvil coupled to the drive piston. The apparatus also preferably comprises a biasing element for temporarily holding the drive piston at BDC of the piston cylinder. The drive mechanism is capable of selectively applying force on the drive piston to move the drive piston away from BDC of the piston cylinder. When the drive mechanism engages the drive piston to move the drive piston away from BDC, a vacuum is generated in the cylinder, which vacuum, after the drive mechanism disengages the drive piston, acts on the drive piston to cause the piston to move toward BDC and the anvil to drive a fastener. A sealed air chamber on the side of the piston opposite the vacuum may assist in generating force.
대표청구항▼
1. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a cylinder,a drive mechanism capable of selectively engaging and disengaging a drive piston, said drive piston disposed within said cylinder, said drive piston capable of moving to and from at least a
1. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a cylinder,a drive mechanism capable of selectively engaging and disengaging a drive piston, said drive piston disposed within said cylinder, said drive piston capable of moving to and from at least a top dead center position and a bottom dead center position in said cylinder, upon being engaged by said drive mechanism,and an anvil, wherein said anvil is operatively coupled to said drive piston,wherein said drive mechanism selectively engages said drive piston to apply a force on said drive piston to move said drive piston within said cylinder and thereafter disengages from and ceases applying a force on said drive piston,wherein when said drive mechanism engages said drive piston to move said drive piston away from said bottom dead center position of said cylinder, a vacuum is generated in the cylinder, which vacuum, after said drive mechanism thereafter disengages said drive piston, acts on said drive piston to cause the said piston to move toward said bottom dead center position of said cylinder, said anvil driving a fastener upon said movement of said drive piston. 2. The fastener driving apparatus of claim 1, wherein said apparatus further comprises one of a mechanical spring and an elastomer disposed about said anvil, which spring or elastomer biases said drive piston at said bottom dead center position within said cylinder. 3. The fastener driving apparatus of claim 1, in which the dead volume of said cylinder does not exceed 20% of the maximum vacuum volume of said cylinder. 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 drive piston, the position of said drive mechanism, whether said apparatus has driven a fastener, and a fault condition in said apparatus. 5. The fastener driving apparatus of claim 1, wherein said drive mechanism comprises one of an interrupted friction wheel and a rack-and-pinion arrangement, and wherein said interrupted friction wheel has a coefficient of friction of at least 0.1. 6. The fastener driving apparatus of claim 1, wherein said drive mechanism further comprises a clutch for holding said drive piston in a position away from bottom dead center before one of ceasing to impart a force on said drive piston and said vacuum acts on said drive piston, and wherein said clutch allows for latency of less than 100 milliseconds upon a user-initiated event. 7. The fastener driving apparatus of claim 1, wherein said drive piston further comprises a floating seal, which floating seal is disposed between said drive piston and said bottom dead center of said cylinder, wherein when said drive piston moves away from said bottom dead center position of said cylinder, a vacuum is generated between said floating seal and said drive piston, andsaid floating seal has a stroke that is no more than 50% of the stroke of said drive piston. 8. The fastener driving apparatus of claim 7, wherein said apparatus further comprises at least one bumper disposed adjacent said floating seal. 9. The fastener driving apparatus of claim 1, wherein the ratio of the force across said drive piston results in a drive piston acceleration of at least 500 feet per second squared. 10. The fastener driving apparatus of claim 1, wherein the ratio of the maximum vacuum volume to the minimum vacuum volume is at least 3:1. 11. The fastener driving apparatus, wherein said apparatus further comprises a valve operatively coupled to a portion of said cylinder in which a vacuum is formed. 12. The fastener driving apparatus of claim 1, further comprising a sealed air chamber on the side of the drive piston opposite the region of the cylinder in which the vacuum is generated. 13. A fastener driving apparatus, the apparatus comprising a power source,a control circuit,a motor,a cylinder,a drive mechanism capable of selectively engaging and disengaging a drive piston, said drive piston disposed within said cylinder, said drive piston capable of moving to and from at least a top dead center position and a bottom dead center position in said cylinder, upon being engaged by said drive mechanism,an anvil, wherein said anvil is operatively coupled to said drive piston,and a sealed air chamber on the side of the drive piston opposite the region of the cylinder in which the vacuum is generated.wherein said drive mechanism comprises an engagement region for engaging and causing said drive piston to move within said cylinder and a non-engagement region for ceasing to cause said drive mechanism to cease causing said drive piston to so move,wherein when said drive mechanism engages said drive piston to move said drive piston away from said bottom dead center position of said cylinder, a vacuum is generated in a region of the cylinder and air is compressed in the sealed air chamber, which vacuum and compressed air, after said drive mechanism thereafter disengages said drive piston, act on said drive piston to cause the said piston to move toward said bottom dead center position of said cylinder, said anvil driving a fastener upon said movement of said drive piston. 14. The fastener driving apparatus of claim 13, wherein said apparatus further comprises one of a mechanical spring and an elastomer disposed about said anvil, which spring or elastomer biases said drive piston at said bottom dead center position within said cylinder. 15. The fastener driving apparatus of claim 13, in which the dead volume of said cylinder does not exceed 20% of the maximum vacuum volume of said cylinder. 16. The fastener driving apparatus of claim 13, wherein said drive mechanism further comprises a clutch for holding said drive piston in a position away from bottom dead center before one of ceasing to impart a force on said drive piston and said vacuum acts on said drive piston, and wherein said clutch allows for latency of less than 100 milliseconds upon a user-initiated event. 17. The fastener driving apparatus of claim 13, wherein said drive piston further comprises a floating seal, which floating seal is disposed between said drive piston and said bottom dead center of said cylinder, wherein when said drive piston moves away from said bottom dead center position of said cylinder, a vacuum is generated between said floating seal and said drive piston, and said floating seal has a stroke that is no more than 50% of the stroke of said drive piston. 18. The fastener driving apparatus of claim 13, wherein the ratio of the force across said drive piston results in a drive piston acceleration of at least 500 feet per second squared. 19. The fastener driving apparatus of claim 13, wherein the ratio of the maximum vacuum volume to the minimum vacuum volume is at least 3:1. 20. The fastener driving apparatus of claim 13, wherein said drive mechanism comprises one of an interrupted friction wheel and a rack-and-pinion arrangement, and wherein said interrupted friction wheel has a coefficient of friction of at least 0.1.
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.; McCardle, Thomas A.; Bolender, Danny L.; Dickinson, Steve; Knueven, Joseph R.; Lance, Jr., Robert L.; Stolz, Dan; Petrocelli, Michael V.; Petrocelli, legal representative, Teresa, Fastener driving tool using a gas spring.
Leimbach, Richard L.; McCardle, Thomas A.; Bolender, Danny L.; Dickinson, Steve; Knueven, Joseph R.; Lance, Jr., Robert L.; Stolz, Dan; Petrocelli, Michael V.; Petrocelli, legal representative, Teresa, 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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