Title:
SONIC BORING SYSTEM USING SPHERICAL DRILL BIT
Document Type and Number:
Japanese Patent JPS61282588
Kind Code:
A
Abstract:
Sonic energy in a cycloidal or quadrature vibration action pattern is generated in a main vibratory drill assembly by means of a sonic oscillator employing an eccentrically weighted rotor. The sonic energy is transmitted down the drill assembly to the drill bit to cause precession of the bit around the bottom of the drill bore in a cycloidal fashion. The drill assembly is coupled to the drill bit through a spherical ball and socket bearing which enables universal rotation of the bit so that it is not constrained along any particular axis. Thus, the bit is free to tip and to rotate on the sonic drill assembly in an orbiting cycloidal fashion in response to the energy transmitted thereto.
Inventors:
ARUBAATO JIYOOJI BOODEIN
Application Number:
JP9318486A
Publication Date:
December 12, 1986
Filing Date:
April 21, 1986
Export Citation:
Assignee:
ARUBAATO JIYOOJI BOODEIN
International Classes:
E02D7/18; E02D7/22; E02D11/00; E21B4/00; E21B4/02; E21B7/24; E21B10/16; E21B10/22; (IPC1-7): E21B7/24; E21B10/00
Attorney, Agent or Firm:
Kenro Shinmi