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    A type of mounting where the hoist is mounted to the top side of a horizontal supporting surface. (ASME HST-4M-1991)

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    Batteries used to guard against inadvertent load release due to loss of primary power to magnet system. (ASME B30.20-1985)

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    Rolled structural steel member typically used as a bridge girder for short span or low capacity cranes.

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    Flanges are the top and bottom flat portions of an I or W shaped beam. The flange width describes the horizontal dimension of an I or W shaped beam when it’s cross-section is seen standing upright.

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    The L10 life of an anti-friction bearing is the minimum expected life, hours, of 90 percent of a group of bearings which are operating at a given speed and loading. The average expected life of the bearings is approximately five times the L10 life.

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    An antifriction bearing which is provided with seals and a high-stability oxidation-resistant grease to permit operation of the bearing without re-lubrication for not less than the specified B-10 life.

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    BHN

    Brinell hardness number, measurement of material hardness. (CMAA Spec. 70)

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    The assembly of hook, swivel, bearings, sheaves, pins and frame suspended from the hoisting ropes. In a “short type” block, the hook and the sheaves are mounted on the same member, called the swivel. In a “long type” block, the hook and the sheaves are mounted on separate members. (The supporting member for the sheaves is called the sheave pin and the supporting member for the hook is called the trunnion. (WCH)

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    A fixed assembly of sheaves, bearings, pins and frame, located on the trolley cross members, and which supports the load block and its load by means of the ropes. (WCH)

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    A type of short end truck, used to allow greater distribution of crane wheel loads, by placing multiple wheels at each corner of the crane.

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    A short end truck which is flexibly connected to one girder (or connecting member) by means of a pin upon which the truck can oscillate to equalize the loading on the two truck wheels. This construction uses a very rigid end tie between the girders. (WCH)

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    A short end truck which is rigidly connected to one girder. A flexible end tie is used between the girders to permit equalization of the wheel loads by torsional deflection of the girders and flexing of the end tie. (WCH)

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    The rectangular cross section of girders, trucks or other members, comprised of 2 rolled steel side plates, a top plate, and a bottom plate.

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    A device, other than a motor, used for retarding or stopping motion by friction or power means.

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    A device, other than a motor, used for retarding or stopping motion by friction or power means. (CMAA Spec. 70)

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    A method of Bridge Crane Control by which the power to the motor is reversed to de-velop torque in the direction opposite to the rotation of the motor using the motor as a generator, with the energy being dissipated by resistance. (ASME B30-16-1993)

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    A friction brake that provides a continuous retarding force having no external Bridge Crane Control. (ASME B30-17)

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    A method of Bridge Crane Controlling speed by block, load the assembly of hook or shackle, swivel. bearing, sheaves, sprockets. pins, and frame suspended by the hoisting rope or load chain. This shall include any appurtenances reeved in the hoisting rope or load chain. (ASME B30-16-1993)

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    A method of Bridge Crane Controlling or reducing speed by means of an Bridge Crane Electrical induction load brake. (ASME B30-17)

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    A method of decelerating a drive when power is not available. The braking effort may be established as a result of action by the operator, or auto¬matically when power to the drive is interrupted. (ASME B30-17)

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    A friction brake for a hoist that is automatically applied and prevents motion when power to the brake is off. (ASME B30.2-1990)

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    A method of Bridge Crane Controlling or reducing speed by means of displacement of a liquid. (ASME B30-17)

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    A method of Bridge Crane Controlling or reduc¬ing speed by friction. (ASME B30-17)

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    An automatic type of friction brake used for Bridge Crane Controlling loads in a lowering direction. This unidirectional device requires torque from the mo¬tor or hand chain wheel to lower a load but does not impose any additional load on the motor or hand chain wheel when lifting a load. (ASME B30-16-1993)

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    A brake for bridge and trolley that may be automatically or manually applied to impede horizon¬tal motion by restraining wheel rotation. (ASME B30-17)

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    A brake for bridge and trolley that may be automatically or manually applied to impede horizon¬tal motion by restraining wheel rotation. (ASME B30-17)

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    A method of Bridge Crane Controlling speed in which the electrical energy generated by the motor is fed back into the power system. (ASME B30-17)

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    A brake for bridge or trolley used by the operator, during normal operation, to apply a retarding force. (ASME B30.2-1990)

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    The circuit conductors between the final over current device protecting the circuit and the outlet(s).

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    The external force that is required to separate the vacuum pad or vacuum lifting device from the load when applied perpendicular to the attachment surface. (ASME B30.20-1985)

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    That part of an overhead crane consisting of girders, trucks, end ties, walkway and drive mechanism which carries the trolley and travels in a direction parallel to the runway.

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    Crane movement in a direction parallel to the crane runway. (ASME B30.11-1993)

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    The electrical conductors located along the bridge structure of a crane to provide power to the trolley.

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    A manual means at the operating station by which hoist Bridge Crane Controls are energized. (ASME HST-4M-1991)

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    A method of Bridge Crane Controlling speed by removing energy from the moving body or by imparting energy in the opposite direction. (ASME HST-4M-1991)

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    The housing containing the elec¬trical Bridge Crane Control component. (ASME HST-4M-1991)

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    The voltage impressed on the Bridge Crane Control devices. (ANSI MH 27.1-1981)

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    A drive Bridge Crane Control system pro¬viding more than one speed operation in either direction using multi-speed squirrel cage. motors. (ANSI MH 27.1-1981)

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    A drive Bridge Crane Control system providing one speed operation in either direction. (ANSI MH 27.1-1981)

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    A drive Bridge Crane Control system providing more than one speed operation in either direction using wound-rotor motors.

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    A device for regulating in a pre-determined way the power delivered to the motor or other equipment. (CMAA Spec. 70)

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    A Bridge Crane Controller having all of its basic functions performed by devices which are operated by hand. (ASME B30-17)

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    A Bridge Crane Controller that, when re-leased, will return automatically to a neutral (off) positioning, static, hydraulic, pneumatic, etc.) that governs the flow of power to or from a motor or other equip¬ment in response to signals from a master switch, push-button station, remote Bridge Crane Control, automatic pro¬gram Bridge Crane Control, or other similar device. (ASME B30.2-1990)

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    The motor and gear reduction unit designed to propel the bridge.

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    The electrical cable that brings power to the hoist and trolley, and control signals to entire crane. This wiring runs the full span of the crane and moves with the trolley and hoist.

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    The main horizontal structural member(s) of the crane bridge supported by the end trucks.

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    The rail supported by the bridge girders on which the trolley travels.

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    Also called BRIDGE MAINTENANCE TRAVELERS. Self-propelled, under-running platforms specifically designed to allow personnel access to underside of bridge structures.

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    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.