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Patent Searching and Data


Title:
HYDRAULIC LIFTING ARRANGEMENT
Document Type and Number:
Japanese Patent JP01145999
Kind Code:
A
Abstract:

PURPOSE: To improve a fast speed and positioning accuracy of a lifting arrangement by arranging a double-acting piston cylinder device driven by two hydraulic pumps, and setting a delivery of the hydraulic pumps constant but mutually different.

CONSTITUTION: A double-acting piston cylinder device 17 driven by two hydraulic pumps 41, 42 is arranged in a lifting arrangement to thereby directly vertically move a lift assembly. A delivery of the hydraulic pumps is selected so as to keep the constant relationship to the ascending and descending side respectively different piston areas of the piston cylinder device 17. A constant delivery reversible hydraulic pump 41 and similarly a constant delivery hydraulic pump 42 are arranged in a hydraulic device system, the pumps 41, 42 are installed on a common shaft 43, and are driven by an electric motor 44 so that the speed and the rotational direction are controlled by a control device 45.


Inventors:
Corke, Andrew
Johansson, Lennart
Application Number:
JP1988000271104
Publication Date:
June 07, 1989
Filing Date:
October 28, 1988
Export Citation:
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Assignee:
BT IND AB
International Classes:
F15B11/08; B66F9/22; F15B7/00; F15B11/00; B66F9/20; F15B7/00; (IPC1-7): B66F9/22; F15B11/08