Tool driving or impacting – Convertible
Patent
1982-02-12
1984-12-11
Yost, Frank T.
Tool driving or impacting
Convertible
144 35A, 173 46, 173 57, 408 20, B27B 1700
Patent
active
044872712
ABSTRACT:
A portable core drill adapted for sampling dense mineral specimens or the like by urging a fluid cooled/lubricated tubular drill bit into a dense mineral mass from which a sample is to be extracted is comprised of a drive member for imparting a drilling-effective rotary motion to a tubular drill bit about a longitudinal drill axis and a spindle member for coupling the drill bit to the drive member, which spindle member includes a bit fastening member for receiving and retaining the drill bit concentrically in respect of the drill axis. The bit fastening member, in turn, is comprised of a bit-engaging collet member, received in a collet housing having tapered sidewalls and an end wall, and a rotatable compression member (i) for constricting the collet member about the outer sidewall of the drill bit at or near the proximal end thereof upon rotation and (ii) for engaging an element on the collet member and urging the collet member outwardly of the collet housing upon counter-rotation; whereby the drill bit may be operatively engaged with and disengaged from the bit fastening member by hand rotation and counter-rotation of the compression member, respectively.
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patent: 4227840 (1980-10-01), Thivierge
patent: 4331883 (1982-05-01), Vitaloni
Burmester Russell F.
Pomeroy Dan M.
Phan Hien H.
Yost Frank T.
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