公开(公告)号：US06510780B1

公开(公告)日：2003-01-28

申请号：US09857507

申请日：2001-08-03

申请人： Bruce Eden ,  David Mantle ,  David Williams ,  Paul Britton

发明人： Bruce Eden ,  David Mantle ,  David Williams ,  Paul Britton

IPC分类号： F04B902

CPC分类号： F04B9/02 ,  F04B11/0083 ,  F15B7/005 ,  F15B7/08

摘要： 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.

摘要翻译： 描述了用于液压驱动的电梯中的可逆驱动的液压泵。 该泵包括一气缸和一活塞，可通过设置在主轴上并与活塞连接的滚珠丝杠，在气缸内可直线致动。 当活塞沿着主轴沿着座圈的运动而被拉动时，活塞的轴是中空的以容纳主轴，并且密封件设置在活塞的自由端处，密封地与气缸壁相接合， 并且在与活塞的轴密封地接合的气缸上。 本发明的另一个特征是在气缸的端部和活塞的端部之间提供可压缩气体，使得其膨胀减小了将活塞移出气缸所需的工作，而当系统松弛时， 可压缩气体提供额外的阻力，从而提供更平滑的运动。