Patent ID: 8398934
Filing Date: 2013-03-19
Classification: F04B,H02K

Abstract:
1. A fluid displacement apparatus comprising: a linear actuator; a drive shaft coupled to the linear actuator, the drive shaft including a first magnetic coupler at one end of the drive shaft; a piston magnetically coupled to the drive shaft of the linear actuator, the piston including a second magnetic coupler at one end of the piston, the second magnetic coupler configured to magnetically engage the first magnetic coupler and configured to mechanically engage the first magnetic coupler if the couplers disengage magnetically, and wherein at least one bearing is positioned between the first magnetic coupler and the second magnetic coupler, and wherein the first magnetic coupler includes at least a first magnetic portion and tangs extending axially relative to the first magnetic coupler and radially inwardly toward a longitudinal axis of the first magnetic coupler, the tangs defining a coupling region; and a cylinder defining a displacement chamber for receiving the piston.