Electric impact tool

Details Electric impact tool Electric impact tool

1975-05-23

1977-08-16

Purser, Ernest R.

Tool driving or impacting

Drive controlled by relative axial movement of tool

741255, 124 10, 173121, 173124, 173170, 226154, 226186, 227131, 227146, 227147, B25C 106

Patent

active

040420361

ABSTRACT:
This invention relates to an electric impact tool characterized by a pair of electric motor-driven counterrotating flywheels, at least one of which is movable relative to the other from a retracted inoperative position into an extended operative one closely adjacent the other flywheel whereby a ram is squeezed therebetween and impelled forward at high speed against a workpiece. The nosepiece of the tool frame is retractable although normally extended due to the spring bias urging it and the movable flywheel to which it is mechanically linked into disengaged position. These elements cooperate with one another and with a manually-actuated trigger such that the latter must be depressed and the nosepiece retracted in order to engage the high energy friction clutch defined by the flywheels so as to operate the ram. A flywheel speed control is provided for matching the ram impact to the workload. The nosepiece also includes an energy absorbing cushion effective to dissipate the excess energy carried by the ram at the end of its work stroke so as to prevent damage to the structure against which the nosepiece is pressed.

REFERENCES:
patent: 1823644 (1931-09-01), Cossock
patent: 2487530 (1949-11-01), Dirksen
patent: 2627849 (1953-02-01), Carlson
patent: 2869824 (1959-01-01), Hazak
patent: 3486569 (1969-12-01), Sieber
patent: 3583497 (1971-06-01), Kossowski
patent: 3661217 (1972-05-01), Maurer
patent: 3766901 (1973-10-01), Cleary et al.
patent: 3770322 (1973-11-01), Cobb et al.

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