Title:
SPIRAL BIT, AND PULLING OUT METHOD OF BURIED ARTICLE USING SPIRAL BIT
Document Type and Number:
Japanese Patent JP2020097857
Kind Code:
A
Abstract:
To easily take out a buried article buried in a burying object such as a concrete wall.SOLUTION: A spiral bit comprises: a spacer 11 including a disk portion and a tube portion constituting a recessed portion having a diameter larger than an outer diameter of an exposed side end portion of a buried object and having a height required to take off the buried object from a burying object; and a spiral shaft portion 12 which is inserted into a center of the disk portion of the spacer 11, which is fixed so as to penetrate the spacer 11, whose recessed portion side is provided with a male screw portion 12a to be screwed with a female screw hole of the buried object is provided, and meanwhile, whose opposing-recessed-portion side is provided with a connection shaft portion 12c to be connected with a rotary chuck portion 72a of an electrically driven driver 72. The male screw portion 12a of the spiral shaft portion 12 protrudes from the tube portion of the spacer 11.SELECTED DRAWING: Figure 2
Inventors:
TAKAGI KOSABURO
Application Number:
JP2018236845A
Publication Date:
June 25, 2020
Filing Date:
December 19, 2018
Export Citation:
Assignee:
BIC CO LTD
International Classes:
E04G17/06
Attorney, Agent or Firm:
Shigeo Nakajima