Power plants – Pressure fluid source and motor – Pulsator
Patent
1990-10-26
1992-11-03
Look, Edward K.
Power plants
Pressure fluid source and motor
Pulsator
60537, 91276, 92 85B, 277165, F15B 702, F01L 1700
Patent
active
051598140
ABSTRACT:
An impulse motor for a hand held hammer machine comprises a housing (10) with a cylinder (11) therein, in which a reciprocating drive piston (40) via a gas cushion in a working chamber (44) of said cylinder (11) repeatedly drives a hammer piston (15) to impact on and to return from a tool (20) carried by the machine housing (10). The drive piston (40) has an axially protruding reduced diameter damping piston (50) thereon adapted to prevent piston encounter collision by arresting the return movement of said hammer piston (15) towards the drive piston (40) in a cooperating damping cylinder (51) provided on the hammer piston (15). The damping piston (50) has two diameterical steps (64,65) formed thereon, of which an outer step (64) is long and has a clearance relative to said damping cylinder (51) enabling during arresting a braking action therebetween by gas friction in said clearance. The inner diametrical step (65) at the root of said damping piston (50) is short and with a fit relative to said damping cylinder (51) sufficient to brake said hammer piston (15) resiliently to halt due to gas trapped in said damping cylinder (51).
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Berema Aktiebolag
Look Edward K.
Munson Eric Y.
Ryznic John
Stone Mark P.
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