Title:
LIFT OF LIQUID PRESSURE TYPE
Document Type and Number:
Japanese Patent JPH01145999
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.
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Inventors:
ANDORIYUU KORUKE
RENNAATO YOHANSON
RENNAATO YOHANSON
Application Number:
JP27110488A
Publication Date:
June 07, 1989
Filing Date:
October 28, 1988
Export Citation:
Assignee:
BIIT IND AB
International Classes:
B66F9/22; F15B7/00; F15B11/08; (IPC1-7): B66F9/22; F15B11/08
Attorney, Agent or Firm:
Akira Asamura (3 outside)