A safety appliance that transfers the weight of the cage onto the guides
if the winding rope breaks. Nelson
A chain used across openings to mantrips and personnel carriers to prevent
miners from falling out of a moving vehicle. Syn:breakaway chain
A check valve to slow the excessive travel speed of a piston in a
hydraulic cylinder. Long
Any of several types of rod clamps used at the collar of a borehole to
hold the drill rods while they are being pulled or lowered. Also called
alligator; automatic spider; floor clamp; foot clamp. Long
A department that deals with all aspects of mine safety and safety
training. See also:safety engineer
A device that releases automatically the hoisting rope from a cage in the
event of an overwind. See also:detaching hook
A spare or extra door fixed ready for use in a roadway in the event of
damage to the existing ventilation door. The safety door is also
positioned so that it can be employed in any emergency, for example,
explosions or fires. The door may be of steel construction. Nelson
An employee whose job is to inspect all possible danger spots in the mine
and plant; to cooperate with safety committees in various parts of the
organization; to keep informed upon safety literature and to carry on a
perpetual educational campaign among workers; to cooperate with agencies
such as the U.S. Mine Safety and Health Administration, the U.S. Bureau of
Mines, the National Safety Council, and State bureaus and inspectors; to
head all rescue work, first-aid instruction courses, and safety-first
meetings; and to draw up and enforce a written code of minimum safety
requirements for all work at the mine and plant.
Explosive that requires a powerful initial impulse and therefore may be
handled safely under ordinary conditions. Bennett
a. The ratio of breakage resistance to load. Nichols, 1
b. See:factor of safety
c. Ratio of breaking stress to working stress. Obert
A train of powder enclosed in cotton, jute yarn, and waterproofing
compounds; used for firing a cap containing the detonating compound, which
in turn sets off the explosive charge. The fuse burns at the rate of 2
ft/min (0.6 m/min). Used mainly for small-scale blasting in quarries and
metal mines. See also:blasting fuse; capped fuse; premature blast.
Nelson
An automatically operated gate placed at the top of a mine shaft, or at
landings, to guard the entrance, to prevent anyone from falling into the
shaft. Fay
Most commonly a sandwich of plastic between two sheets of glass; i.e.,
laminated safety glass. Also called tempered safety glass; wire safety
glass. See also:Triplex glass
a. A cap or hat with a hard crown worn by miners, will resist blows
against it. BCI
b. A hat or cap made of rigid material, designed for the protection of the
heads of workers. If worn in a mine equipped with electricity, the
material should be electrically nonconducting. Also called safety cap.
c. See:tin hat
a. A hoisting hook with a spring-loaded latch that prevents a load from
accidentally slipping off the hook. Long
b. A self-acting detachable hook on a mine cage, which acts in the event
of an overwind. See:safety detaching hook
c. A safety catch in a mine hoist. Standard, 2
See:mine inspector
A coarse-threaded joint in the head of a double-tube core barrel. If the
core barrel becomes lodged in the borehole, the safety joint, inner tube,
and core can be removed by backing off at the safety joint, thereby
facilitating the subsequent fishing job. Long
In gassy mines, a lamp of an approved type, which is relatively safe to
use in atmospheres that may contain flammable gas. Latterly, the term
tends to be restricted to naptha-fueled safety lamps, which are issued to
mine inspection personnel and used for combustible gas tests.
See also:bonnet; cap lamp; Davy lamp; flame safety lamp;
electric cap lamp. Nelson
See:lampman
In Great Britain, a coal mine in no part of which below ground is the use
of lamps or lights other than permitted lights lawful. Nelson
A latch provided on a hook or elevator to prevent it from becoming
detached prematurely. CF:safety hook