Motor crane lift
the distance between the two wall mounting points).īrake: A device for slowing or, stopping motion by friction or by electrical means.īrake, Mechanical Load: An automatic type of friction brake in the hoist that is used for controlling loads in a lowering direction. The “jib” of the jib crane.īracket Center: The distance, center line to center line, between two supporting brackets of a wall mounted jib crane (i.e. The weight of these devices is to be considered part of the load to be lifted.īoom: The horizontal beam (track) upon which a hoist trolley travels. The boom is mounted on a trolley.īoom (Gantry Crane): A trolley runway extension often used to obtain clearance for gantry travel by retracting or raising.īox Section: The rectangular cross section of girders, end trucks or other members enclosed on four sides.īrake: A device, other than a motor, on a hoist or crane that stops or pauses motion by power or friction.īranch Circuit: The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s).īridge: The part of an overhead crane consisting of girders, end trucks, end ties, walkway and drive mechanism which carries the trolley and travels in a direction parallel to the runway.īridge Conductors: The electrical conductors located along the bridge structure of a crane to provide power to the trolley and hoisting machineries.īridge Rail: The rail supported by the bridge girders on which the trolley travels.īumper (Buffer): An energy absorbing device for reducing impact when a moving crane or trolley reaches the end of its permitted travel, or when two moving cranes or trolleys come into contact.īay: The space between the building frames measured parallel to the crest of the building.īelow-the-hook Lifting Devices: Devices that are not normally reeved onto the hoist rope or chain, such as hook-on buckets, magnets, grabs, and other supplemental devices used for ease of handling certain types of loads. The average expected life of the bearing is approximately five times the L-10 life.īHN: Brinell hardness number, which is a measurement of material hardness.īoom (Overhead Crane): A horizontal member used to permit hoisting as well as lowering the load at a point other than directly under the hoist drum or trolley. Formula: Axial load= (overall weight of the crane) + (design factor x weight of load)Īuxiliary Girder (Outrigger): A girder arranged parallel to the main girder for supporting the platform, motor base, operator’s cab, control panels, etc., to reduce the torsional forces such a load would otherwise impose on the main girder.īearing Life Expectancy: The L-10 life of an anti-friction bearing is the minimum expected life, hours of 90% of a group of bearings which are operating at a given speed and loading. Abnormal Operating Conditions: Environmental conditions that are unfavorable, harmful or detrimental to or for the operation of a crane or hoist conditions such as excessively high or low temperatures, corrosive fumes, dust laden or moisture laden atmospheres and hazardous locations.Īdjustable or Variable Voltage: A method of control by which the motor supply voltage can be adjusted.Īnchor Bolt : A bolt used with its head embedded in masonry or concrete and its threaded part protruding to hold a jib crane in place.Īnchor Bolt Load: The total amount of force that is applied to each supporting anchor bolt in a jib crane usually measured in kips.ĪNSI: American National Standards InstituteĪppointed: Assigned specific responsibilities by the employer or the employer’s representative.ĪSCE Rail : The runway rails on top running cranes that the bridge travels on.Īutomatic Crane : A crane which when activated operates through a preset cycle or cycles.Īuxiliary Hoist: A supplemental hoisting unit of lighter capacity and usually higher speed than provided for the main hoist.Īxial load : The total vertical force applied to the supporting structure in a jib crane.