Title:
【発明の名称】ボアホ-ル中で使用するためのハンマ及びそれと共に使用するための装置
Document Type and Number:
Japanese Patent JPS61501640
Kind Code:
A
Abstract:
Apparatus for drilling a bore hole comprises a hammer (3) and a series of dual wall drill tubes (2). The hammer (3) is supplied with compressed air and is for use in applying successive percussive blows to a percussive drill cutting bit for taking core samples from the bottom of the bore hole while drilling same. An upstanding rig (37) is provided at surface level to support the hammer (3) and drill tubes (2) and to transmit push-down or pull-up movement thereto. First means (32) indexes rotationally the bit for drilling purposes and is operable by a portion of the supply of air. Second means conducts from the bottom end of the bore hole that portion of air used by and exhausted from the percussive cutting bit (27) and having core particles entrained therein. Third means comprises an annular flushing jet (7) to direct a portion of air upwardly through a sampling tube (6) co-axial with the drill tube (2) and hammer (3) to induce a venturi to assist in conducting core particle entrained exhaust air upwardly.
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Inventors:
Ennis, Melvin Samuel The Ames
Application Number:
JP50120285A
Publication Date:
August 07, 1986
Filing Date:
March 18, 1985
Export Citation:
Assignee:
Ennis, Melvin Samuel The Ames
International Classes:
E21B4/14; E21B25/00; E21B6/06; E21B21/12; (IPC1-7): E21B25/00
Attorney, Agent or Firm:
Mamoru Suzuki