Title:
【発明の名称】ボール・スクリュー駆動ポンプ
Document Type and Number:
Japanese Patent JP2002531754
Kind Code:
A
Abstract:
A reversibly actuatable fluid hydraulic pump is described for use in a hydraulically driven elevator. The pump comprises a cylinder and a piston linearly actuatable within the cylinder by a ball screw race disposed over a spindle and connected to the piston. The shaft of the piston is hollow to receive the spindle as the piston is drawn along by virtue of the motion of the race along the spindle, and seals are provided at the free end of the piston which sealingly engage against the walls of the cylinder, and on the cylinder which sealingly engage with the shaft of the piston. A further feature of the invention is the provision of a compressible gas between the end of the cylinder and the end of the piston so that the expansion thereof reduces the work required to move the piston out of the cylinder, whereas when the system is relaxing, the compressible gas provides extra resistance and thus a smoother motion.
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Inventors:
Eden, Bruce
Mantor, David
Williams, David
Brighton, Paul
Mantor, David
Williams, David
Brighton, Paul
Application Number:
JP2000585548A
Publication Date:
September 24, 2002
Filing Date:
December 03, 1999
Export Citation:
Assignee:
Brighton Price Limited
Hydrax Limited
Hydrax Limited
International Classes:
F04B23/00; F04B9/02; F04B9/107; F04B9/115; F04B9/123; F04B11/00; F04B53/00; F04B53/02; F04B53/14; F04B53/16; F15B7/00; F15B7/08; (IPC1-7): F04B9/02; F04B9/107; F04B9/115; F04B9/123; F04B23/00; F04B53/00; F04B53/02; F04B53/14; F04B53/16
Attorney, Agent or Firm:
Mitsuo Chonan (2 outside)