Automatic Arm Restraints 

Automatic arm restraints are needed to keep the arm locked into a position relative to the carriage. When the arms are at rest in the lowest position, the arm restraint pin (which extends below the carriage) is pressed up and the lock (teeth) mechanism is disengaged.
The operator On the 2 Post Hoist can then move the arms so that the lift pads can be properly positioned under the Car Hoist points. Once the carriage is raised (approximately 50 MM ) the lock is re-engaged and the arms cannot be moved. However, the operator may pull the knob or metal ring to manually unlock the arms. Lock restraints do not guarantee that a Car cannot be moved off of the Hoist pads.

Automatic Arm Restraints C