A-A-52535
2.6.1 Safety. Means shall be provided to insure that the drill rod is retained in the drill under all operating conditions.
2.6.1.1 Noise limits. The drill shall be muffled to limit the perceived noise to 95 decibels (dB) at the operators ear when drilling at the performance levels of 2.4. If the noise level at the operator’s ear is above 85 dB (A), a warning decal will be placed on the drill stating that hearing protection is required during operation.
2.6.2 Handles. Rubber-covered handles shall be incorporated to provide the operator with insulation against cold, heat, vibration and shock.
2.6.3 Drop-forged components. Highly stressed components such as the handles, backhead cylinder and fronthead shall utilize drop forged, alloy steel construction to ensure long operating life and impact resistance.
2.6.4 Swivel hose connection. The air hose inlet connection shall utilize a swivel to avoid hose kinking.
2.6.5 Air-cushioned stroke. The drill design shall provide for automatic air cushioning at the top and bottom of the piston stroke.
2.6.5.1 Throttle valve. The throttle valve shall be conveniently located so as to be operable during drilling without the operator losing control of the drill. The throttle shall have not less than three positive, self-locking positions: off, hole collaring, and full throttle.
2.6.6 Blower valve. Blowing shall be accomplished by an automatic continuous blowing arrangement which functions while the drill is operating, supplemented by a manually positioned blower valve. The automatic continuous blowing arrangement shall function to keep the drill cuttings away from beneath the face of the bit. The blower valve shall function to direct air through the drill to the chuck and hollow drill rod.
2.6.7 Exhaust ports. The exhaust air shall vent away from the operator, through an orifice sufficiently large to prevent condensation and freezing.
2.6.8 Cushioned retainer. A spring-cushioned retainer shall be provided to absorb shock from the drill rod.
2.6.9 Replacerable chuck bushing. The chuck bushing shall be easily replaceable and act as a “weak link” to protect the piston.
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