Title:
EXCAVATOR OF VERTICAL EXCAVATION SYSTEM
Document Type and Number:
Japanese Patent JP3780490
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve troubles and inefficiencies in works by the conventional method in which an excavation rod is elevated/lowered by the winch operation by a worker.
SOLUTION: A sheave block 5 is suspended by a support member in an elevating/lowering manner through a wire 4, and a rotary part 9 located below the sheave block is connected to the sheave block 5 through a hydraulic cylinder 14 for vertical movement in a vertically movable manner. An excavation rod 16 is connected to an output shaft of the rotary part 9 and suspended, and a hydraulic circuit having an automatic switching device to automatically and alternately expand/contract the hydraulic cylinder 14 for vertical movement is provided.
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Inventors:
Masaru Adachi
Kazuo Yamasaki
Kazuo Yamasaki
Application Number:
JP28289696A
Publication Date:
May 31, 2006
Filing Date:
October 07, 1996
Export Citation:
Assignee:
Yamato Kikko Co., Ltd.
Sanwa Equipment Co., Ltd.
Sanwa Equipment Co., Ltd.
International Classes:
E21B3/02; E21B7/00; E21B3/035; (IPC1-7): E21B3/02; E21B7/00
Domestic Patent References:
| JP7113389A | ||||
| JP7026868A | ||||
| JP9217581A | ||||
| JP3079339U | ||||
| JP9041861A | ||||
| JP7293180A |
Attorney, Agent or Firm:
Takefumi Tanaka
Chiaki Shinseki
Chiaki Shinseki