Machinery Safety - Types of Guards

In this topic discussed about the Machinery Guarding Types. Machinery should be guarded to protect employees from Machinery hazards. To know about machinery hazards, click on this link MACHINERY HAZARDS.

TYPES OF GUARDS:

1. FIXED GUARD

Guard affixed in such a manner (e.g. by screws, nuts or welding) that it can only be opened or removed by the use of tools or destruction of the affixing means.

2. ADJUSTABLE GUARD

Fixed guard which is adjustable as a whole or which incorporates adjustable part(s). The adjustment remains fixed during a particular operation.

3. INTERLOCKED GUARD

Guard associated with an interlocking device so that, together with the control system of the machine, the following functions are performed:

• The hazardous machine function "covered" by the guard cannot operate until the guard is closed

• If the guard is opened while hazardous machine functions are operating, a stop command is given.

• When the guard is closed, the hazardous machine functions covered by the guard can operate. The closure of the guard does  not by itself start the hazardous machine functions.

4. HOLD TO RUN CONTROL DEVICE

Control device that initiates and maintains operation of machine elements only as long as the manual control (actuator) is actuated. The manual control returns automatically to the stop position when released.

5. TWO HAND CONTROL DEVICE

Control device that requires at least simultaneous actuation with both hands in order to trigger and to maintain hazardous machine functions, providing a protective measure only for the person who actuates it.

6. TRIP DEVICE

Device that causes a machine or machine elements to stop (or ensures an otherwise safe condition) when a person or a part of his body goes beyond a safe limit.

Trip devices may be:

Mechanically actuated, e.g. trip wires, telescopic probes, pressure sensitive devices, etc.

Non-mechanically actuated, e.g. photo-electric devices, devices using capacitive, ultra-sonic, etc. means to achieve detection.

7. MECHANICAL RESTRAINT DEVICE

Device that introduces into a mechanism a mechanical obstacle (wedge, spindle, strut, scotch, etc.) which, by virtue of its own strength, can prevent any hazardous movement. This could include, for example, the fall of a ramp due to the failure of the normal retaining system.

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