Title:
DEVICE FOR PULLING UP CYLINDRICAL BODY
Document Type and Number:
Japanese Patent JP3442457
Kind Code:
B2
Abstract:
PURPOSE: To make it possible to pull up an damaged casing pipe.
CONSTITUTION: Six wedge-like ribs 5, 5,... are fixed to the circumference of a pushing section 2 extended outward of the direction of the axis in the front end of a tube 1. Slits 21, 21,... are formed toward the tube 1 side from the front end of the pushing section 2 between the ribs 5, 5,... adjacent to the circumferential direction of the pushing section 2. A rod 3 is fitted to a ring-shaped bearing member 7 provided to the circumference of the tube 1 in a slidable manner in the direction of the axis. While an approximately truncated cone- shaped cone section 4 gradually narrowed forward is fixed to the front end of the rod 3, a piston 6 is fixed to the rear end of the rod 3. The piston 6 is pushed by high pressure water, and the pushing section 2 is enlarged outward in the direction of the radius by the cone section 4 of the rod 3 through the wedge-like ribs 5, 5,... by pushing out the rod 3 forward.
Inventors:
Koji Matayoshi
Noriyuki Nakamura
Tatsuhiro Furunaga
Kishikawa Hachihiro
Noriyuki Nakamura
Tatsuhiro Furunaga
Kishikawa Hachihiro
Application Number:
JP4079094A
Publication Date:
September 02, 2003
Filing Date:
March 11, 1994
Export Citation:
Assignee:
Okumura Gumi Co., Ltd.
International Classes:
E21B31/20; (IPC1-7): E21B31/20
Domestic Patent References:
| JP2136194U | ||||
| JP6035674Y2 |
Attorney, Agent or Firm:
Aoyama Ryo (1 person outside)