Title:
PILE DRIVER
Document Type and Number:
Japanese Patent JP3853027
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain such a pile driver as a steady rest platform is not made to interfere with the rising and falling of an auger screw.
SOLUTION: A steady rest platform for stopping vibration of an auger screw is borne on a leader in a liftable manner, at the same time, a winch 32 is mounted on an auger mechanism, and the steady rest platform is hung down by the winch 32. The winch 32 is driven with a hydraulic motor 36, and a low pressure relief valve 68 set in operating fluid pressure eliminating the slack of a wire 34 and an opening and closing valve 70 are provided to a low pressure relief channel 66 connecting a winding side supply channel 44 to the hydraulic motor 36 in the case of winding to a returning channel 58.
Inventors:
Yoichi Shibayama
Application Number:
JP16447697A
Publication Date:
December 06, 2006
Filing Date:
June 20, 1997
Export Citation:
Assignee:
Nippon Vehicle Manufacturing Co., Ltd.
International Classes:
E21B3/02; E21B7/00; (IPC1-7): E21B3/02; E21B7/00
Domestic Patent References:
| JP63001095U | ||||
| JP8210074A | ||||
| JP6030294U | ||||
| JP6063695U | ||||
| JP9112178A | ||||
| JP59192980U | ||||
| JP2058627A |
Attorney, Agent or Firm:
Tsutomu Adachi
Toshihiro Tanaka
Toshihiro Tanaka