Motors: expansible chamber type – Working member position responsive motive fluid control – Venting expanding chamber
Patent
1974-12-05
1976-11-09
Schwadron, Martin P.
Motors: expansible chamber type
Working member position responsive motive fluid control
Venting expanding chamber
83580, 83617, 83639, 91 5, 91394, 91410, 91471, 92 85B, 92129, F15B 1522
Patent
active
039903516
ABSTRACT:
A pneumatic impact device comprising a housing, a drive piston and a piston rod. At the forward end of the piston rod there is attached a tool intended for metal working like punching, cropping or forging. The housing contains a drive chamber, an air charge chamber, a reverse chamber and a retard chamber. The piston rod is provided with two forward-facing, annular shoulders one of which constitutes a reverse piston for working in the reverse chamber and the other a retard piston for working in the retard chamber. For being protected from impact strains, the drive piston is longitudinally displaceable relative to the piston rod. During the working strokes, the drive piston cooperates with a backwardly facing shoulder on the piston rod, but just before the latter reaches the point where the tool hits the billet to be worked, the drive piston is stopped in the drive chamber and is thereby separated from the piston rod shoulder.
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Atlas Copco Aktiebolag
Hershkovitz Abraham
Schwadron Martin P.
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