Patent ID: 6698495
Filing Date: 2004-03-02
Classification: B22C

Abstract:
A rotational drive system that is capable of rotating an object in clockwise and/or counterclockwise directions up to two hundred seventy degrees of rotation; said rotational drive system having a dual piston drive and an oil between air drive component; said rotational drive system comprising:an object that is to be rotated a double ended lever; said double ended lever having a central pivot and a first lever arm and a second lever arm; said first lever arm extending from said central pivot to a first lever arm tip; said first lever arm tip having a pivoting connection thereon; said second lever arm extending from said central pivot to a second lever arm tip; said second lever arm tip having a pivoting connection thereon; a shaft having a first shaft end and a second shaft end; said first shaft end securely fastened to said object and said second shaft end securely fastened to said central pivot of said double ended lever; a first drive piston and cylinder assembly having a first drive cylinder, a first drive piston and a first drive shaft; said first drive cylinder having a closed end; said closed end of said first drive cylinder having a pivoting connection thereon; said pivoting connection of said closed end of said first drive cylinder being connected to said pivoting connection of said end of said first lever arm; a flow restricting device located near said closed end of said first drive cylinder; said first drive cylinder having said first drive piston therein; said first drive shaft being connected on one end to said first drive piston; said first drive shaft having a shaft pivoting connection on the opposite end of said first drive shaft; a control valve; a first fluid line that is connected at one end near said shaft end of said first drive cylinder and connected at the other end to said control valve; a second drive piston and cylinder assembly having a second drive cylinder, a second drive piston and a second drive shaft; said second drive cylinder having a closed end; said closed end of said second drive cylinder having a pivoting connection thereon; said second drive cylinder having said second drive piston therein; said second drive shaft being connected on one end to said second drive piston; said second drive shaft having a shaft pivoting connection on the opposite end of said second drive shaft; said shaft pivoting connection of said second drive shaft being connected to said pivoting connection of said tip of said second lever arm of said double ended lever; a second fluid line that is coupled on one end to said control valve and connects on the other end near said shaft end of said second drive cylinder; a fluid pressure transfer device that has a liquid chamber and air chamber; said fluid pressure transfer device configured to automatically transfer fluid pressure from one chamber to the other chamber when one chamber has a higher pressure than the other; said liquid chamber having oil therein; a third fluid line having oil therein that connects on one end to said liquid chamber of said fluid pressure transfer device, and connects on the other end near said closed end of said second drive cylinder; said second drive cylinder having oil therein; a fourth fluid line that connects on one end to said air chamber of said fluid pressure transfer device, and connects on the other end to said control valve.