ASME B30.18:2021 pdf free download – Stacker Cranes
emergency braking: a method of decelerating a drive when power is not available. The braking effort may be estab- ished as a result of action by the operator or automatically when power to the drive is interrupted. end tie: a structural member that connects the ends of the bridge girders to maintain squareness of the bridge. equalizer: a device that compensates for unequal length or stretch of a rope. exposed: applies to hazardous objects not guarded or isolated, and capable of being contacted inadvertently. footwalk: a walkway with handraill on or attached to the bridge or trolley for access purposes. forks: a load-bearing means mounted on the carriage. free fall stop: a mechanism used to prevent or stop down- ward vertical travel of the carriage or cab in the event of loss of support. heavy service: service that involves operating at 85% to 100% of rated load or in excess of 10 lift cycles/hr as a regular specifed procedure. hoist: a machinery unit that is used for lifting and lowering. hoist chain: the chain in a hoist that supports the carriage and is calibrated to mate with sprockets, idlers, and pocket wheels. hoisting mechanism: the means provided for lifting and lowering portions of the stacker and the rated load. holding brake: a frction brake for a hoist that is automat- ically applied and prevents motion when power to the brake is off. . home position: the position that is both an originating point and terminating point of the stacker crane cycle. hydraulic braking: a method of controlling or reducing speed by means of displacement of a liquid. limit switch: a device that is operated by some part or motion of a power-driven machine or equipment t alter a circuit associated with the machine or equipment load center: a point on the forks, measured from the heel of the forks, that establishes the limiting distance on the forks for positioning the center of gravity of the load to be lifted.
normal operating conditions (of cab-operated cranes): conditions during which the equipment is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices, and there is no other person on the equip- ment. normal operating conditions (of floor-operated cranes): conditions during which the equipment is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices that are attached to the equipment but operated with the operator off the equipment and there is no person on the equipment. normal operating conditions (of remote-operated cranes): conditions during which the equipment is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices that are not attached to any part of the equipment and with no other person on the equipment. normal. service: service that averages operating at less than 85% of rated load and not more than 10 lift cycles per hour for isolated instances. original language(s): language(s) used by the manufac- turer to develop product instructions and manual(s). parking brake: a brake for bridges and trolleys that may be automatically or manually applied in an attempt to prevent horizontal motion by restraining wheel rotation. qualified person: a person, who by possession of a recog- nized degree in an applicable field, certificate of profes- sional standing, or who by extensive knowledge, training, and experience, has sucessfully demonstrated the ability to solve or resolve problems relating to the subject matter and work.