Section 7.7 Automatic Transfer Devices
A flashing light and an audible signal shall be actuated on the start of the door opening prior to transfer. Where used in nonrestricted areas, the automatic transfer device shall be designed so that the kinetic energy of the load during discharge shall not exceed 40 J (30 ft-lbf) and the speed shall not exceed 0.5 m/s (1.5 ft/s). The automatic transfer device shall stop the load at the completion of a discharge operation.
Where the transfer of load is in a nonrestricted area, there shall be a clearance of not less than 1220 mm (48 in.) between the end of the transferred load and any fixed obstruction in line with the end of the load. Where the automatic transfer device is designed to carry out multiple cart transfers, the 1220 mm (48 in.) clearance space shall be measured from the leading edge of the first cart to be ejected, once the multiple transfer operation has been completed.
In nonrestricted areas, discharge shall not take place unless the area is clear or a protective device or suitable guarding is provided. Guarding shall be by one of the following methods:
(a) railings or suitable barriers to prevent persons from entering the path of the transferring load.
(b) mechanical or electrical devices designed to prevent or stop transfer if a person or object is in the path of the transferring load.
(c) providing a table or a raised section not less than 460 mm (18 in.) above the floor and of such dimensions that the load does not overhang the table or raised section. The distance between the car platform sill and the nearest edge of the table shall not exceed 150 mm (6 in.).