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Subchapter 17. Mine Safety Orders
Article 36. Hoisting Equipment
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§7126. First-Class Hoists.

(a) (19-3) Belt, rope, or chains shall not be used to connect driving mechanisms to man hoists.

(b) The hoist shall be provide with ample power to hoist the fully loaded and unbalanced shaft conveyance from the lowest point in the shaft.

(c) (19-4) The hoist shall be equipped with 2 independent and separate braking systems, either of which shall be capable of holding 150 percent of the weight of the fully loaded and unbalanced shaft conveyance at any point in the shaft.

Such brakes shall be so arranged that the failure of one will not interfere with the proper operation of the other. One such braking system shall operate directly on the hoist drum.

(d) Brakes and other control devices shall be arranged and maintained so that they can be easily and safely manipulated by the hoistman at his operating station.

(e) No brake required by this section is acceptable if its operation depends on engaging a jaw clutch, multiple-tooth clutch, or similar device.

(f) (19-5) (19-65) The clutch and one brake on every hoist drum shall be so arranged that the brake must be applied before the drum can be unclutched, and the clutch must be engaged before the brake can be released.

(g) The clutch of every hoist drum shall be provided with means to prevent it being accidentally engaged or released.

(h) (19-9) Every hoist shall be provided with an indicator that will accurately show at any moment the position of the conveyance in the shaft.

It is recommended that the indicator be of a type that is operated by the hoist drum through a system of gears.

Belt-driven indicators are not acceptable because of the danger of the belt slipping or breaking.

(i) The hoist drums shall be provided with flanges that extend at least three diameters of the hoisting rope radially beyond the last layer of rope when all of the rope is coiled on the drum.

(j) Bolts and other fittings of the hoist shall be made secure by suitable locking devices.

(k) (19-120) The hoist shall be maintained in good operating condition. Parts that are defective, broken, cracked, or dangerously worn shall be repaired or replaced without delay.

(l) The hoist drum and head sheave shall be so aligned that the head sheave is at a right angle to the centerline of the hoist drum.

(m) The distance between the hoist drum and the nearest fixed sheave shall be not less than 15 feet for each foot of drum width.

(n) Each hoist drum and head sheave where men are hoisted or lowered shall have a minimum diameter according to the type of rope used, as given below:

6-strand 7-wire rope--42 times rope diameter

6-strand 19-wire rope--30 times rope diameter

6-strand 37-wire rope--18 times rope diameter

8-strand 19-wire rope--21 times rope diameter

(o) The hoistings rope shall be securely fastened to the hoist drum with at least four cable clips, or equivalent, and shall have at least three full wraps of cable on the drum when the hoisting conveyance is at its greatest depth.

(p) Only a first-class hoist shall be used for hoisting or lowering men.

(q) (19-7) Man hoists shall be provided with devices to prevent overtravel and overspeed.

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