22.214.171.124 Driving Machines, Sheaves, and Their Supports
(a) Securing of Machinery Beams and Types of Supports. All machinery and sheaves shall be supported and secured to prevent any part from becoming loose or displaced.
Beams supporting machinery shall be steel, sound timber, or reinforced concrete.
(b) Overhead Beams and Their Supports. Overhead beams and their supports shall be designed for not less than the sum of the following:
(1) the load resting on the beams and their supports, which shall include the complete weight of the machine, sheaves, controller, and any other equipment supported thereon
(2) the sum of the tension on all suspension ropes or chains times 2
(c) Factor of Safety for Overhead Beams and Supports. The factor of safety for overhead beams and supports based on ultimate strength of material shall be not less than 5 for steel and 6 for timber and reinforced concrete.
(a) Types of Driving Means. The driving means shall be one of the following types:
(2) winding drum (see 126.96.36.199.3)
(4) roped-hydraulic (see 5.3.2)
(5) screw machine (see 188.8.131.52.4)
(6) chain drive
(7) chain-hydraulic (see 5.3.2)
(b) Material for Sheaves and Drums and Minimum Diameter
(1) Winding drums, traction sheaves, and overhead and deflecting sheaves shall be metal and the pitch diameter shall be not less than one of the following:
(-a) 30 times the diameter of the wire suspension means
(c) Fastening of Driving Machines and Sheaves to the Underside of Overhead Beams
(1) Overhead driving machines or sheaves shall not be fastened to the underside of the supporting beams, except for idlers or deflecting sheaves including their guards and frames.
(2) Cast iron in tension shall not be used for supporting idler and deflecting sheaves where they are hung beneath the beams.
(d) Fastenings Transmitting Load. Fasteners transmitting load shall conform to 2.24.4.
(e) Friction Gearing, Clutch Mechanisms, or Couplings. Friction gearings or clutch mechanisms shall not be used for connecting the drum or drive sheave to the main drive gear. Couplings shall not be used for connecting the output shaft to the main drive gear.
(f) Use of Cast Iron in Gears. Worm gearing having cast iron teeth shall not be used.
(h) Driving-Machine Brakes. Driving machines, except hydraulic driving machines, shall be equipped with electrically released, mechanically applied brakes conforming to 2.24.8. The operation of the brake shall conform to 2.26.8.
(1) It shall not be accessible from inside the car.
(2) It shall not release the brake.
(3) Upon removal of the device, the car shall not move.
(4) The device shall be actuated by mechanical means only.
(j) Car-Top-Mounted Machine or Controller. Where the machine or its controls are located on top of the car
(1) they shall be protected by a solid, noncombustible enclosure.
(a) Suspension Means Retainers. Suspension means retainers shall be continuous over not less than two-thirds of the arc of contact between the suspension means and its sheave or drum and shall be located so that not more than one-sixth of the arc of contact is exposed at each end of the retainer. For double-wrap traction applications, the arc of contact for sheaves or drums shall be the length of arc that is uninterrupted by the entry/exit of the suspension means leading to/from the car or counterweight.
(b) Suspension Means Restraints. One suspension means restraint, where the arc of contact is 30 deg or less, shall be located at the midpoint of the arc of contact; where the arc of contact exceeds 30 deg, suspension means restraints shall be provided at intervals not exceeding 30 deg of arc along the arc of contact and at each end of the arc of contact.