Autoquip FREIGHTLIFT FLH - Manual (Page 14)

14
There are several primary active safety features and devices to help protect personnel,
property, and the equipment.
MECHANICAL LOCKING SAFETY CAMS
Each wire rope is terminated at the platform carriage in a clevis, which is attached to a
tension spring loaded steel safety cam. This safety cam pivots on a high strength steel
pin which is chrome plated. The safety cam has serrated teeth cut into one of its faces
that are adjacent to the guideway flange.
Should the wire rope become slack for any reason, the spring tension would cause the
serrated teeth of the safety cam to engage the guideway. The teeth bite into the
guideway and a wedging effect takes place between the safety cam and the guideway.
The result is a positive halt to downward movement.
The only way to release the safety cam is to correct the malfunction that caused the
slack rope and exert upward tension on the rope through the hydraulic cylinder and
cable sheaves. Either of the two cams will support the loaded platform carriage at any
point in the vertical travel.
WARNING !
Slack ropes require factory help! Do not attempt to repair slack wire rope
conditions alone! Always contact the local representative or call the
Autoquip Service Department.
ZERO DRIFT FEATURE
A zero drift feature has been incorporated into the hydraulic FREIGHTLIFT. The zero
drift utilizes a pressure switch in the electrical circuit. If the pressure switch closes due
to a pressure drop or leak, the motor will start momentarily to build pressure until the
pressure switch shuts the motor off. This keeps the platform from drifting downward
from the upper level. When the operator closes all gates and energizes the down
pushbutton, the zero drift circuit is disabled and the carriage will lower.
SAFETY FEATURES