Power drill with drill bit unit capable of providing intermitten

Details Power drill with drill bit unit capable of providing intermitten Power drill with drill bit unit capable of providing intermitten

1995-07-07

1996-07-02

Smith, Scott A.

Tool driving or impacting

Automatic control of power operated means

Drive means responsive to torque or speed condition

173 13, 173 48, 173178, 173216, E21C 112

Patent

active

055312780

ABSTRACT:
A power drill includes a casing, a bit-carrying shaft provided with a front toothed member, a rear toothed member fixed on the casing, a driving unit, and a speed reduction device which interconnects the driving unit and the shaft so as to rotate the shaft at a speed smaller than that of the driving unit. The speed reduction device includes a planetary gear train provided with an internal gear mounted in the casing, and a coiled compression spring which presses the internal gear against an inner wall of the casing so as to fix the internal gear in the casing. An adjustment member is mounted rotatably on the casing and cannot move axially on the casing. The compression spring is located between the internal gear and the stepped portion of the adjustment member. The adjustment member is rotatable relative to the casing so as to compress the compression spring, thereby increasing the push force of the compression spring toward the internal gear, and so as to interengage the front and rear toothed members, thereby urging the front toothed member and the shaft to move forward away from the rear toothed member and providing an impact to an object to be drilled. In use, when the drill unit rotates and when the shaft cannot rotate, the internal gear can rotate.

REFERENCES:
patent: 3710873 (1973-01-01), Allen
patent: 3741313 (1973-06-01), States
patent: 5209308 (1993-05-01), Sasaki
patent: 5289885 (1994-03-01), Sakoh
patent: 5343961 (1994-09-01), Ichikawa
patent: 5372206 (1994-12-01), Sasaki et al.
patent: 5385512 (1995-01-01), Moolenaar et al.

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