Impact buffer for impact drive tools

Details Impact buffer for impact drive tools Impact buffer for impact drive tools

1974-07-24

1976-07-20

Schwadron, Martin P.

Expansible chamber devices

With cushioning means effective over a portion only of stroke

92212, 92249, 227130, F01B 1102

Patent

active

039699897

ABSTRACT:
An impact drive tool has a cylinder within which a percussive piston is mounted for actuating a ram to drive a nail into a workpiece. Valve means are provided for introducing compressed air to one side of the piston to cause the impact stroke, and an air storage chamber is provided for returning the piston to its rest position. A truncated cone shaped first buffer element of a cellular polyurethane is affixed to the bottom of the percussive piston. A second buffer element of a harder material, such as a cross-linked polyurethane is mounted in the bottom of the cylinder. The second buffer element has a recess facing the first buffer element and shaped to receive the first element. The buffer elements are positioned so that, at the end of an impact stroke, the first buffer element is initially deformed, followed by the striking of a bottom portion of the piston on the second buffer element to absorb the impact energy.

REFERENCES:
patent: 2821170 (1958-01-01), Jacobus
patent: 2983922 (1961-05-01), Juilfs
patent: 3146459 (1964-09-01), Bade
patent: 3205787 (1965-09-01), Volkmann
patent: 3231255 (1966-01-01), Olson
patent: 3320860 (1967-05-01), Bade
patent: 3387541 (1968-06-01), Bade
patent: 3403600 (1968-10-01), Bade
patent: 3465650 (1969-09-01), Gluck
patent: 3494530 (1970-02-01), Bade
patent: 3512454 (1970-05-01), Perkins

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