Powered fastener driver and operating method thereof
A powered fastener driver includes a cylinder and a drive piston within the cylinder being acted on by a driving force resulting from a pressure differential. The powered fastener further includes a drive blade coupled to the drive piston and operable to drive a fastener, and an adjustable valve for selectively introducing air from ambient atmosphere into the cylinder, thereby changing the pressure differential acting on the drive piston. By adopting a self-contained vacuum generating means as described above, the present invention does not rely on any external vacuum source and powered fastener driver can be used and carried with conveniently.
1. A powered fastener driver comprising:
a cylinder;
a reciprocating piston within the cylinder;
a drive blade;
a drive piston coupled to the drive blade;
a latch holding the drive blade stationary relative to the cylinder while being acted on by a driving force; and
a trip member carried by the reciprocating piston for disengaging the latch from the drive blade, thereby allowing the drive blade to move under the influence of the driving force;
wherein the driving force results from a pressure differential acting on the drive piston, and wherein the pressure differential is created by a vacuum developed between the drive piston and the reciprocating piston.
2. The powered fastener driver according to claim 1 , wherein the vacuum is developed by moving the reciprocating piston away from the drive piston.
3. The powered fastener driver according to claim 1 , wherein the reciprocating piston includes a first side facing the drive piston and a second side opposite the first side; and wherein the trip member is coupled to the second side.
4. The powered fastener driver according to claim 1 , wherein the drive blade includes a notch.
5. The powered fastener driver according to claim 4 , wherein the latch includes a pin that is receivable in the notch.
6. The powered fastener driver according to claim 1 , further comprising a spring biasing the latch towards the drive blade.
7. The powered fastener driver according to claim 6 , wherein the spring biases the latch to pivot towards the drive blade about a pivot pin.
8. The powered fastener driver according to claim 1 , wherein the latch is formed with investment casting.
9. The powered fastener driver according to claim 1 , wherein the pressure differential increases as the reciprocating piston approaches the latch.
10. A powered fastener driver comprising:
a cylinder;
a reciprocating piston within the cylinder;
a drive blade;
a drive piston coupled to the drive blade;
a latch engaged with the drive blade and holding the drive blade and drive piston stationary relative to the cylinder while the reciprocating piston is moved away from the drive piston; and
a trip member carried on the reciprocating piston for disengaging the latch from the drive blade;
wherein the latch is disengaged from the drive blade when the reciprocating piston reaches a predetermined position, thereby allowing the drive blade and drive piston to move.
11. The powered fastener driver according to claim 10 , wherein once the latch is disengaged from the drive blade, the drive blade and the drive piston move under the influence of a pressure differential acting on the drive piston.
12. The powered fastener driver according to claim 11 , wherein the pressure differential is created by a vacuum developed between the drive piston and the reciprocating piston.
13. The powered fastener driver according to claim 10 , wherein the reciprocating piston includes a first side facing the drive piston and a second side opposite the first side; and wherein the trip member is coupled to the second side.
14. The powered fastener driver according to claim 10 , wherein the drive blade includes a notch and the latch includes a pin that is receivable in the notch.
15. The powered fastener driver according to claim 10 , further comprising a spring biasing the latch towards the drive blade.
16. The powered fastener driver according to claim 10 , wherein the predetermined position of the reciprocating piston is a bottom dead center position.