Title:
【発明の名称】デリックにおけるピストンシリンダ装置のピストンの昇降装置及び方法
Document Type and Number:
Japanese Patent JP2000502765
Kind Code:
A
Abstract:
An apparatus for a derrick, comprising two or more hydraulic piston/cylinder arrangements (10, 11) for raising and lowering a yoke (8) which travels on guide rails (7) in the derrick itself and a hydraulic system (30) for the operation of piston/cylinder arrangements (10, 11), where the hydraulic system has various modes of operation, normal raising or lowering of the yoke (i), use of the differential area of the piston (21) for rapid lowering or raising of the yoke (8) and, optionally, a combination of these with extra pressure provided from the accumulators (39).
Inventors:
Vatone, pair
Application Number:
JP52353297A
Publication Date:
March 07, 2000
Filing Date:
December 18, 1996
Export Citation:
Assignee:
Maritime Hydrolith Axiecel Scap
International Classes:
E21B15/00; E21B19/02; E21B19/086; (IPC1-7): E21B19/02
Attorney, Agent or Firm:
Shigeru Yagita (2 outside)