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A linear actuator uses one of a variety of mechanisms to produce motion in a straight line. The range of motion is called the stroke and can be measured in foot pounds of torque and inches of travel. A high speed linear actuator would also be rated by the amount of time required to complete its linear travel, such as inches per second. Linear actuators may be mechanical, hydraulic, pneumatic, or electro-mechanical. The power source for these devices may be low or high voltage electric circuits, compressed air, or hydraulic fluid under pressure. Parts for linear systems may include brackets, bearings, shafts and glides, controls, wiring, and relays and other switches. Applications include openers and closers for doors, door locks, positioners for chairs and beds, linear motion material handlers for machining operations and other manufacturing tasks. A heavy duty linear actuator may be used for applications such as multi-level car park equipment or a conveyor system lift.