Subchapter D. STAGE, ORCHESTRA, ORGAN CONSOLE
AND LUMBER ELEVATORS
Sec.
7.111. Shaftway construction.
7.112. Lifting capacity.
7.113. Control apparatus.
7.114. Driving mechanism.
7.115. Electrical equipment.
7.116. Platform construction.§ 7.111. Shaftway construction.
(a) The shaftways of orchestra and organ console elevators shall be of fire-resistive construction below the top landing. The inside surface of such shaftways, within the limits of travel, shall have a smooth finish without any projections or recesses except for landing entrances, guides and guide brackets, vertical slots when required for concealed guides, and junction boxes and conduits for wiring. Projections or recesses at landing entrances shall be beveled on the underside or guarded with metal plates. The angle of such bevels or guard plates shall not be less than 60° from the horizontal.
(b) The shaftways of lumber elevators shall be enclosed on all sides not used for loading or unloading with solid partitions not less than 6 feet in height and shall be flush. All points of loading and unloading shall be protected by movable bars or railings. Gates, as specified in § 7.278(c) (relating to landing gates) are required where the travel exceeds 6 feet and there are two or more landings. All shearing points shall be protected by flaring at an angle of not less than 60° from the horizontal.
(c) A pit shall be provided at the bottom of every shaftway of such depth that when the platform is at its lowest limit of travel the distance between the lowest point of the underside of the platform framing and to the floor of the pit shall not be less than 2 feet.
(d) The bottom landing openings of orchestra and organ console shaftways shall be protected by sliding doors of fire-resistive construction. If swinging doors are used they shall open outward.
(e) Railings and toeboards shall be provided at the floor levels of orchestra and organ console elevators.
(f) Steel rails shall be used for guides of stage, orchestra, and organ console elevators. Lumber elevators shall be provided with substantial guides of either wood or steel.
(g) Shaftway landing doors shall be equipped with approved locking devices.
§ 7.112. Lifting capacity.
(a) The lifting capacity of an orchestra or organ console elevator shall be equal to a live load of not less than 25 pounds per square foot of floor area of the platform.
(b) The lifting capacity of a stage elevator shall be equal to a live load of not less than 75 pounds per square foot of floor area of the platform.
(c) Railings, aprons, wiring, conduits, outlets, and the like, are considered as part of the weight of the movable platforms.
§ 7.113. Control apparatus.
(a) Operating switches shall be provided in a suitable location on the platforms of orchestra and organ console elevators. Emergency stop switches shall be provided and placed adjacent to the operating switches in as convenient a location as possible. A manually-operated double-pole disconnecting service switch shall be installed in the main line to cut off power from the operating machinery. When alternating current is used, reverse phase relays shall be provided.
(b) Lumber elevators shall be operated by switches or buttons located at a point where the entire shaftway is visible. Buttons shall be of the constant pressure type. Hand switches shall be of the self-centering type.
§ 7.114. Driving mechanism.
(a) When elevating screws are used they shall be of the direct connected type, either worm or beveled gears, and all gears shall be enclosed in a housing, except that chain drive lumber hoists are permitted when provided with equalizing chains or when approved slack chain switches are installed and enclosed.
(b) When a stage, orchestra, or organ console elevator is not supported or operated by either screws, plungers, or similar means, car safeties shall be provided under the platform capable of stopping and holding the platform with a full-rated load at any point of its travel.
(c) When lumber elevators are so installed that they are not within the intent of this subchapter, they shall be made to comply with the requirements for freight or passenger elevators.
§ 7.115. Electrical equipment.
(a) A suitably lighted room shall be provided outside of the shaftway for the motor controller and brake unless the motor and controller are placed in the pit, in which case stone or masonry piers or columns shall be provided to take sufficiently the impact of a full-loaded car.
(b) When the motor and controller are located in a shaftway pit or in a pit adjacent to the hoist, access to such pit shall be provided by means of a door entirely below the bottom of the platform when the platform is at its lowest limit of travel.
(c) Terminal limit switches located in the shaftway, or a stop motion device on the operating machine, shall be provided and arranged to automatically bring the platform to rest as it approaches either terminal landing.
(d) Final limit switches shall be provided at the top and bottom of the shaftway arranged to cut off the current and stop the platform if it runs by the terminal limit switches.
§ 7.116. Platform construction.
(a) The platforms of stage, orchestra, organ console and lumber elevators shall be of steel frame construction designed with a factor of safety of not less than six based on the rated load, uniformly distributed. Other parts of the equipment shall have a safety factor as required by this chapter.
(b) When orchestra and organ console elevators are installed in the same shaftway, the adjacent sides shall be provided with aprons of substantial construction or railings and toeboards, or all if necessary, to avoid a shearing hazard.
(c) When the travel of a stage, orchestra or organ console elevator extends above the top of the shaftway enclosure, aprons of substantial construction shall be provided on the platform of sufficient depth to enclose the space between the top of the shaftway enclosure and the underside of the platform when the platform is at its limit of travel.
(d) When the travel of a lumber elevator extends above the top of the surrounding floor level, an apron of substantial construction shall be provided on all sides of the platform of a sufficient depth to enclose the space between the floor level and the underside of the platform when the platform is at its limit of travel.
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