High efficiency pneumatic impacting mechanism with a plunger val

Details High efficiency pneumatic impacting mechanism with a plunger val High efficiency pneumatic impacting mechanism with a plunger val

1991-09-03

1993-04-06

Yost, Frank T.

Tool driving or impacting

Drive controlled by relative axial movement of tool

Drive motor controlled

173206, 91297, 92 85A, B23Q 5033, F01B 2502

Patent

active

051995042

ABSTRACT:
A pneumatic impacting mechanism comprising a first cylinder and a piston with a rear air distributing bar and a front air distributing bar which simultaneously acts as an impacting head of the same, said rear distributing bar having an axially extending air inlet channel, which in turn can be connected, through a radial air channel in the piston, alternatively with a pair of air inlet channels leading to a second cylinder of a plunger valve, said plunger valve being provided with two annular grooves at both ends for alternatively controlling two air inlet channels and two air exhaust channels. In this manner, the quantities of compressed air entering into the first cylinder during forward and backward strokes are determined by the lengths of the two distributing bars. Moreover, two air buffer chambers are provided at both ends of the first cylinder so that the compressed air doing work within said first cylinder can expand to approximately atmosphere. With the back pressure of the piston reduced considerably, the energy of compressed air can be made full use of.

REFERENCES:
patent: 428672 (1890-05-01), Frost
patent: 816021 (1906-03-01), Leyner
patent: 909923 (1909-01-01), Mitchell
patent: 1740713 (1929-12-01), Rundqvist
patent: 2228338 (1941-01-01), Bennett
patent: 2831933 (1958-04-01), Schrameck et al.
patent: 4179983 (1979-12-01), Wallace
patent: 4240332 (1980-12-01), Deutsch
patent: 5056606 (1991-10-01), Barthomeuf

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