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1. (US5531278) Power drill with drill bit unit capable of providing intermittent axial impact

Office : United States of America
Application Number: 08499173 Application Date: 07.07.1995
Publication Number: 5531278 Publication Date: 02.07.1996
Grant Number: 5531278 Grant Date: 02.07.1996
Publication Kind : A
IPC:
E21C 1/12
B25D 16/00
E21B 3/00
E21B 3/035
E21B 6/00
E21B 44/00
(Deprecated)
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
C
MINING OR QUARRYING
1
Rotary-drilling machines
12
with percussive action superimposed on a continuously-rotating tool always in contact with the working face
B PERFORMING OPERATIONS; TRANSPORTING
25
HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; HANDLES FOR HAND IMPLEMENTS; WORKSHOP EQUIPMENT; MANIPULATORS
D
PERCUSSIVE TOOLS
16
Portable percussive machines with superimposed rotation
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
3
Rotary drilling
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
3
Rotary drilling
02
Surface drives for rotary drilling
035
with slipping or elastic transmission
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
6
Drives for drilling with combined rotary and percussive action
E FIXED CONSTRUCTIONS
21
EARTH OR ROCK DRILLING; MINING
B
EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
44
Automatic control systems specially adapted for drilling operations, i.e. self-operating systems which function to carry out or modify a drilling operation without intervention of a human operator, e.g. computer-controlled drilling systems; Systems specially adapted for monitoring a plurality of drilling variables or conditions
Applicants: LIN; PI-CHU
Inventors: Lin Pi-Chu
Agents: Nixon & Vanderhye
Priority Data:
Title: (EN) Power drill with drill bit unit capable of providing intermittent axial impact
Abstract: front page image
(EN)

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.