Requisite Characteristics of Guards:
The Twelve Characteristics of Guards, specifications or basic requirements of a guard are:
- With its primary purpose of protection, it should also facilitate the work i.e. Should be convenient, reliable and not hampering the work or production
- It should fully satisfy the legal provisions and IS prescribed i.e. Should a complete guard and not incomplete or giving any access to the part to protected
- It should be as close as possible. It should be suitable and effective to the job and the machine. Should not weaken the machine.
- It should allow for oiling, inspection, adjustment and repair. If it requires opening for this purpose, it should be easily and quickly replaceable should withstand wear, shock, vibration and long use with minimum main tenancy.
- If it requires frequent opening and closing, this factor becomes more important. It should be of proper material and construction.
- Fire and corrosion resistant material is preferable h should be free from self-hazard such as sharp or rough edges, nails, splinters etc.
- If visual watch of operation is necessary, it should be transparent and yet durable. If dusting is possible as in case of machining of wood, rubber, brass, cast iron etc. Apart from the guard dust suction device should also be fitted as a special guarding it should be failsafe i.e.
- If it fails or breaks it should stop the machine or at least it should give warning (alarm) to stop the machine.
- It should interlocking type i.e. the machine will not start till it not closed and will stop soon if it opened.
- It should fulfil special requirement depending upon its purpose viz. distance guard should provide sufficient protective distance; trip guard must immediately trip the machine etc.
- It may be difficult to fulfil all these requirements but is desirable that safety engineers must design guards by keeping above points in mind.
- If it is not possible to provide guard without interfering with production, safety should be preceded over production.