mobile cranes hoist safety（移动起重机起重安全）.doc

Mobile Cranes Hoist Safety Applicable OSHA Standards: 29 CFR 1910.180, 1926.251, 1926.550 PURPOSE SCOPE This program is intended to provide Total Maintenance Services, Inc. personnel with a guideline for the safe operation, use and inspection of mobile cranes and hoists. This policy applies to wheel mounted cranes of both truck and self-propelled wheel type, and any variations thereof that retain the same fundamental characteristics used at company-controlled work locations where company employees are performing work. DEFINITIONS Accessory -- A secondary part or assembly of parts which contributes to the overall function and usefulness of a machine. Axis of Rotation -- The vertical axis around which the crane superstructure rotates. Base -- The traveling base or carrier on which the rotating superstructure is mounted such as a car, truck, crawlers, or wheel platform. Boom Angle -- The angle between the horizontal and longitudinal centerline of the boom. The boom longitudinal centerline is a straight line between the boom foot pin (heel pin) centerline and boom point sheave pin centerline. Boom Hoist -- A hoist drum and rope reeving system used to raise and lower the boom. The rope system may be all live reeving or a combination of live reeving and pendants. Boom -- Member hinged to the front of the rotating superstructure with the outer end supported by ropes leading to a gantry or A-frame and used for supporting the hoisting tackle. Boom Stop -- A device used to limit the angle of the boom at the highest position. Brake -- A device used for retarding or stopping motion by friction or power means. Cab -- A housing which covers the rotating superstructure machinery and/or operators station. On truck-crane trucks a separate cab covers the drivers station. Clutch -- A friction, electromagnetic, hydraulic, pneumatic, or positive mechanical device for engagement or disengagement of power. Counterweight -- A weight used to supplement the weight of the machine