Title:
WATER STOP JIG FOR ROTARY PERCUSSION DRILL DEVICE
Document Type and Number:
Japanese Patent JP2022189397
Kind Code:
A
Abstract:
To provide a water stop jig for a rotary percussion drill device capable of suppressing the flow of water at a predetermined position inside a drill tube or inside an outer tube even if the water contained in the soil suddenly flows in through the drill tube when the inner tube is retrieved.SOLUTION: A water stop jig for rotary percussion drill device comprises a cylindrical main body 10 having a stepped portion 11 on its outer periphery and through which an inner tube is inserted so as to freely move back and forth, and a pair of open/close doors 21 and 22 that are pushed open by the inner tube passing through the main body 10 and advancing forward, maintain this state and start a closing operation for closing the opening of the main body when the inner tube passes through the main body 10 and retreats rearward. The pair of open/close doors 21 and 22 are provided with elastic members 21b and 22b that are elastically deformed when the open/close doors 21 and 22 are pushed open through the inner tube and urge the open/close doors 21 and 22 in a closing direction.SELECTED DRAWING: Figure 1
Inventors:
KIMURA MITSUHIRO
YAMASHITA YOSHIHIKO
YAMASHITA YOSHIHIKO
Application Number:
JP2021097952A
Publication Date:
December 22, 2022
Filing Date:
June 11, 2021
Export Citation:
Assignee:
SBC CO LTD
International Classes:
E21B6/00
Attorney, Agent or Firm:
Yosuke Koreeda
Hiroyuki Kusuya
Takuji Hashiba
Hiroyuki Kusuya
Takuji Hashiba