Title:
SUPER-SLOW ELEVATIGN DEVICE
Document Type and Number:
Japanese Patent JP2002332790
Kind Code:
A
Abstract:
To provide a super-slow elevating device capable of continuously elevating a working device at a super-slow speed.
This super-slow elevating device 1 for elevating a working device 120 mounted elevatingly along a leader 113 of a pile driver has a first elevating means 10 for elevating the working device 120 by the output of a hydraulic motor, and a second elevating means 20 connecting the first elevating means 10 to the working device 120 and comprising a hydraulic cylinder for elevating the working device 120 in relation to the first elevating means 10.
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Inventors:
TOMITA YASUKIMI
Application Number:
JP2001136798A
Publication Date:
November 22, 2002
Filing Date:
May 08, 2001
Export Citation:
Assignee:
NIPPON SHARYO SEIZO KK
International Classes:
E21B7/00; E02D7/00; E21B3/02; E21B3/035; (IPC1-7): E21B7/00; E21B3/02
Attorney, Agent or Firm:
Takashi Tomizawa (3 others)