Abnormal operating conditions

General

Environmental con­ditions that are unfavorable, harmful, or detrimental to or for the operation of a crane, such as excessively high or low ambient temperatures, exposure to  ad­verse weather, corrosive fumes, dust-laden or mois­ture-laden atmospheres, and hazardous locations.  (ASME B30.2-1990)

Access platform

Overhead Crane

A limited length platform, located on the idler girder to access to the endtruck wheels only.

Adjustable or variable voltage

Bridge Crane Control

A method of Bridge Crane Control by which the motor supply voltage can be adjusted. (CMAA Spec. 70)

Administrative or regulatory authority

Regulatory

Governmental agency or, in the absence of governmental jurisdic­tion, the employer.  (ASME B30.2-1990)

Ambient temperature

General

The temperature of the at­mosphere surrounding the hoist.  (ASME HST-4M-1991)

Ampacity

Bridge Crane Bridge Crane Electrical

The current carrying capacity expressed in amperes. (ANSI MH 27.1-1981)

Appointed

Regulatory

Assigned specific responsibilities by the employer or the employer’s representative.  (ASME B30-17)

Authorized

Regulatory

Appointed by a duly constituted adminis­trative or regulatory authority. (ASME B30-17)

Automatic crane

Overhead Crane

A crane which when activated operates through a preset cycle or cycles. (ANSI MH 27.1-1981)

Automatic dispatch carrier

Monorail

A carrier which when activated operates through a preset cycle or cycles. (ANSI MH 27.1-1981)

Auxiliary hoist

Hoist

A supplemental hoisting unit, usually designed to handle lighter loads at a higher sped than the main host. (CMAA Spec. 70)

Axle, fixed

Drive

A shaft which is fixed in the end truck and about which the wheel revolves. (WCH)

Axle, rotating

Drive

A shaft which is fixed in the wheel and which rotates on bearings fixed in the end truck. (WCH)

B-10 bearing life

General

The B-lO bearing life of an anti-friction bearing is the minimum expected life, in hours, of 9O~7o of a group of bearings which are operated at a given speed and loading. (ANSI MH 27.1-1981)

Base or deck mounted (hoist)

Hoist

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

Battery system (backup)

Below Hook Device

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

Beam

Overhead Crane & Hoist

An overhead standard structural or spe­cially fabricated shape on which the trolley operates.  (ASME HST-4M-1991)

Bearing life

General

The L-10 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 L-10 life. (CMAA Spec. 70)

Bearing, lifetime lubricated

General

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.

Below the hook device

BHN

General

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

Block, load

Hoist

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)

Block, upper

Hoist

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)

Bogie

Overhead Crane

A short end truck attached to the end of one girder (or to a connecting member if more than one bogie is used per girder). This type of end truck is used when more than four wheels are required on a crane due to the design of the runway. (WCH)

Bogie, equalizing

Hoist

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)

Bogie, fixed

Overhead Crane

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)

Boom (of gantry cranes)

Overhead Crane

An extension of the trolley runway that may be raised or retracted to obtain clearance for gantry travel.  (ASME B30.2-1990)

Boom (of overhead cranes)

Overhead Crane

A horizontal member mounted on the trolley to permit hoisting and low­ering the load at a point other than directly under the hoist drum or trolley. (ASME B30.2-1990)

Box section

Overhead Crane

The rectangular cross section of girders, trucks or other members enclosed on four sides. (CMAA Spec. 70)

Brake

Overhead Crane & Hoist

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

Brake, Bridge Crane Control

Overhead Crane & Hoist

A method of Bridge Crane Controlling speed by re­moving energy from the moving body or by imparting energy in the opposite direction.  (ASME B30-16-1993)

Brake, countertorque (plugging)

Hoist

A method of Bridge Crane Control by which the power to the motor is reversed to de­velop 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)

Brake, drag

Overhead Crane & Hoist

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

Brake, dynamic

Hoist

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)

Brake, eddy current

Overhead Crane & Hoist

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

Brake, emergency

Overhead Crane

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 auto­matically when power to the drive is interrupted.(ASME B30-17)

Brake, holding

Overhead Crane & Hoist

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

Brake, hydraulic

Overhead Crane

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

Brake, mechanical

Overhead Crane & Hoist

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

Brake, mechanical load

Hoist

An automatic type of friction brake used for Bridge Crane Controlling loads in a lowering direction. This unidirectional device requires torque from the mo­tor 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)

Brake, parking

Overhead Crane

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

Brake, pneumatic

Overhead Crane

A method of Bridge Crane Controlling or pow­ering a drive or brake by means of compressed gas. (ASME B30-17)

Brake, regenerative

Hoist

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)

Brake, service

Overhead Crane

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

Branch circuit

Bridge Crane Control

The circuit conductors between the final overcurrent device protecting the circuit and the outlet(s). (CMAA Spec. 70)

Breakaway force

Below Hook Device

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)

Bridge

Overhead Crane

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. (CMAA Spec. 70)

Bridge (crane) travel 

Overhead Crane

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

Bridge conductors

Overhead Crane

The electrical conductors located along the bridge structure of a crane to provide power to the trolley. (CMAA Spec. 70)

Bridge crane, top running

Overhead Crane

Bridge Crane, Under running

Overhead Crane

Bridge girder (crane girder)

Overhead Crane

Crane member on which carriers or trolleys travel, horizontally mounted between and supported by the end trucks. Building Structure. The structural members of a building  which support the building loads and on which the loads of crane or monorail equipment, and the material to be moved, will be imposed. (ANSI MH 27.1-1981)

Bridge rail

Overhead Crane

The rail supported by the bridge girders on which the trolley travels. (CMAA Spec. 70)

Bridge travel

Overhead Crane

The crane movement in a direction parallel to the crane runway.  (ASME B30.2-1990)

Bumper (buffer)

Overhead Crane

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. (CMAA Spec. 70)

Cab

Overhead Crane

The operator’s compartment on a crane.  (ASME B30-17)

Cab Bridge Crane Controlled

Equipment Bridge Crane Controlled from an operator’s cab. (ANSI MH 27.1-1981)

Cab, normal

Overhead Crane

Operator’s compartment used for Bridge Crane Controlling a cab-operated crane.  (ASME B30.2-1990)

Cab, skeleton 

Overhead Crane

Operator’s compartment used for oc­casional cab operation of, normally, a floor- or remote-operated crane or carrier.  (ASME B30.11-1993)

Cab-operated crane

Overhead Crane

A crane Bridge Crane Controlled by an operator in a cab located on the bridge or trolley. (CMAA Spec. 70)

Camber

Overhead Crane

The slight upward vertical curve given to girders to compensate partially for deflection due to hook load and weight of the Crane. (CMAA Spec. 70)

Cantilever frame

Overhead Crane

A structural member that supports the trolley of a wall crane.  (ASME B30.2-1990)

Capacity

General

The maximum rated load (in tons) which a cranes designed. to handle. (CMAA Spec. 70)

Carrier (also known as trolley)

Hoist

A unit that travels on the bottom flange of a monorail track, jib boom, or bridge girder to transport a load.  (ASME B30.11-1993)