Section 23.31. Equipment

(a) Each washing machine, drying tumbler, drum, shaker or similar equipment of the double cylinder type shall be provided with an interlocking device to prevent the inside cylinder from moving when the outer door on the case or shell is open. The device shall prevent the outer door from opening while the inside cylinder is in motion. This device may not prevent the movement of the inner cylinder under the action of a hand-operated mechanism or an inching device.

(b) Each washing machine, drying tumbler, drum, shaker or similar equipment of the single cylinder type shall be equipped with an approved device which shall automatically prevent the cylinder from moving while the door is open. The outside of the cylinder shall be smooth-surfaced or so guarded as to prevent contact with employes or other persons while the machine is in operation.