§ 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.
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