Two-piece fastener air hammer

Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path

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Details

7245317, 85 84, B21J 1534

Patent

active

041832396

ABSTRACT:
A power impacting device includes two driving pistons, an inner piston, and an outer piston concentric with the inner piston. Pressurized fluid is supplied first to the outer piston and then to the inner piston to drive a two-piece fastener through material which it is to fasten together. The fastener includes an outer component which is driven by the outer piston, and an inner component which is driven by the inner piston to cam tip portions of the outer component radially outwardly to tightly hold two or more workpieces together. The fasteners may be automatically fed to the impacting device, and frangible links provided therewith for engaging riflings in the barrel of the impacting device to impart a rotational velocity component to the fasteners when they are driven. The impacting device is inoperative unless it is pressed into contact with the surface into which fasteners are to be driven and a handle safety mechanism is operated, and a loading gate allowing the feed of fasteners to the device is closed.

REFERENCES:
patent: 1587317 (1926-06-01), Horton
patent: 3032771 (1962-05-01), Bisbing
patent: 3042244 (1962-07-01), Van Hecke
patent: 3487745 (1970-01-01), Brunelle
patent: 3691924 (1972-09-01), Baker
patent: 3724738 (1973-04-01), Hurst
patent: 3924509 (1975-12-01), Alexandrer
patent: 4036309 (1977-07-01), Petreev

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