Devices
Pullback Devices
Pullback devices use a series of cables attached to the operator's hands, wrists, and/or arms. This type of device is primarily used on machines with stroking action. When the slide/ram is up between cycles, the operator is allowed access to the point of operation. When the slide/ram begins to cycle by starting its descent, a mechanical linkage automatically assures withdrawal of the hands from the point of operation.
Restraint Devices
The restraint (holdout) device in the figure below uses cables or straps that are attached to the operator's hands at a fixed point. The cables or straps must be adjusted to let the operator's hands travel only within a predetermined safe area. There is no extending or retracting action required because the hands are never allowed to extend into the danger area. Consequently, hand-feeding tools are often necessary if the operation involves placing material into the danger area.
Safety Trip Controls
Safety trip controls provide a quick means for deactivating the machine in an emergency situation. A pressure-sensitive body bar, when depressed, will deactivate the machine. If the operator or anyone trips, loses balance, or is drawn toward the machine, applying pressure to the bar will stop the operation. The positioning of the bar, therefore, is critical. It must stop the machine before a part of the employee's body reaches the danger area. Unfortunately, it may be easy to defeat the body bar by going under it into the danger zone. The figure below shows a pressure-sensitive body bar located on the front of a rubber mill.
Restraint Device
Safety Trip controls
Knowledge Check Choose the best answer for the question.
2-4. Which of the following devices requires the operator to use hand-feeding tools if the operation involves placing material into the danger area?
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