Sonic drill employing orbiting crank mechanism
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United States of America Patent
Stats
-
Sep 15, 1987
Issued Date -
N/A
app pub date -
Apr 7, 1986
filing date -
Apr 22, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drive shaft is rotatably mounted in a housing having a predetermined mass. This drive shaft has an eccentric portion at the output end thereof, this eccentric portion forming a crank arm. A drill bit is mounted on suitable bearings on the output end of the shaft adjacent to the eccentric crank arm portion. The drive shaft is rotatably driven causing the crank arm to generate sonic energy which is limited in amplitude by the crank throw reacting against the inductive inertia of the housing mass. The sonic energy thus generated causes the drill bit to orbit around at a sonic frequency to effect drilling action so as to produce a bore hole having a somewhat oversize diameter limited however in accordance with the housing's mass reactance and the throw of the crank arm.
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