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Patent Searching and Data


Title:
KELLY-BAR BRACING DEVICE
Document Type and Number:
Japanese Patent JPH10317868
Kind Code:
A
Abstract:

To prevent an interference in a bracing base at the time of excavation and extraction.

A kelly-bar 26 is suspended from a main wire 14 from a main winch 12 loaded on a construction equipment body 1, and an excavating tool 28 is installed at the front end of the kelly-bar 26. A sheave is supported rotatably to a bracing base 34 supported to a leader 2 in a manner that the bracing base 34 can be lifted and lowered. A wire 66 from a winch 64 is wound on the sheave while the tip of the wire 66 is connected to a connecting member 68 mounted on the front end side of the kelly-bar 26, and the bracing base 34 is hung dot. A lower-section bracing base 70 stopping the shaking of the kelly-bar 26 is supported on the lower end side of the leader 2 in a manner that the lower-section bracing base 70 can be elevated and brought down.


Inventors:
YOSHIDA SHIGEMITSU
Application Number:
JP13390697A
Publication Date:
December 02, 1998
Filing Date:
May 23, 1997
Export Citation:
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Assignee:
NIPPON SHARYO SEIZO KK
International Classes:
E21B3/00; E21B17/07; E21B19/02; (IPC1-7): E21B19/02; E21B3/00; E21B17/07
Attorney, Agent or Firm:
Tsutomu Adachi (1 person outside)