Piston and driver
AssigneeSenco Products, Inc.
InventorGeorge F. Vornberger
Life of this patent
Estimating the term…
Abstract
An improved piston and driver structure includes a synthetic piston body, a bifurcated piston insert and a driver secured within the insert by means of a pin and by means of frictional engagement of the driver by the piston insert when the insert is assembled to the piston body. The piston insert has an enlarged top for dissipating operating pressures over the piston body.
Claims19
A piston and fastener driver for use in fastener driving apparatus and comprising:
- a piston body having a threaded bore and an outwardly tapering bore extending from said threaded bore;
- a piston insert disposed in said threaded bore and said tapering bore and including a threaded male portion threaded into said threaded bore, and a frusto-conical portion having cooperating surfaces engaging said tapering bore;
- a longitudinal slot in said insert through said threaded male portion and said frusto-conical portion;
- and,
- a driver disposed in said slot, said insert frictionally engaging and holding said driver, with said driver extending from an end of said insert opposite said frusto-conical portion.
A fluid driven piston and fastener driver for use in fastener driving apparatus, said piston and driver including:
- a piston body having an upper side and an underside, an upwardly opening tapered bore extending therethrough and open to the upper side of said piston, a threaded bore beneath and in communication with said bore, and said piston body being movable in one direction from one position to a second position upon application of expanding fluid to said top side;
- an integral piston insert removably disposed and threaded into said threaded bore within said piston body
- a fastener driver interconnected and fixed to said insert and extending away from said piston body and said insert in said one direction;
- said insert comprising a flared top, of greater diameter than the remainder of said insert, engaging said upper side of said piston.
A piston and fastener driver as in claim 14, wherein portions of said flared top, said frusto-conical portion and said threaded male portion of said piston insert each operatively engage respective surfaces of said piston for securing said insert and said driver in and to said piston.
Dependencies are inferred from the claim text.