Interlocked Guards
When this type of guard is opened or removed, the tripping mechanism and/or power automatically shut off or disengage, and the machine cannot cycle or be started until the guard is back in place.
Refer to the image. The interlocked guard cannot be raised while the machine is running, nor can the machine be restarted with the guard in the raised position.
An interlocked guard may use electrical, mechanical, hydraulic, or pneumatic power, or any combination of these. Interlocks should not prevent "inching" by remote control if required. Replacing the guard should not automatically restart the machine. To be effective, all movable guards should be interlocked to prevent occupational hazards.
| Safeguarding Action | Advantages | Limitations |
|
Shuts off or disengages power, stops the moving parts and prevents starting of the machine when the guard is open; should require the machine to be stopped before the worker can reach into the danger area |
Can provide maximum protection Allows access to the machine for removing jams without time consuming removal of the fixed guards |
Requires careful adjustment and maintenance May be easy to disengage |
Knowledge Check Choose the best answer for the question.
2-3. Which type of guard automatically shuts off or disengages when it is opened or removed?
You forgot to answer the question!