Patent ID: 7029253
Filing Date: 2006-04-18
Classification: F01C,F04C

Abstract:
1. A pneumatic cylinder of a pneumatic tool comprising: a) a cylinder body having: b) two end caps, one of the two end caps is located on each of two opposing ends of the cylindrical body, each of the two end caps having: c) a rotor located in the cylindrical chamber and having a rotary shaft being fixed thereto, one of two ends of the rotary shaft being inserted through the first central through hole of each of the two end caps; d) two bearings, one of the two bearings being located in the circular cavity of each of the two end caps; and e) two airtight rings, one of the two airtight rings being located in each circular dent between one of the two bearings and the bottom of the circular cavity of each of the two end caps, each of the two airtight rings having a second central through hole, one of two ends of the rotary shaft being inserted through the second central through hole of each of the two airtight rings.