Crane

abnormal operating conditions: 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 adverseweather,
corrosive fumes, dust-laden or moisture-laden atmospheres,
and hazardous locations.
administrative or regulatory authority: governmental
agency or, in the absence of governmental jurisdiction,
the employer.
appointed: assigned specific responsibilities by the
employer or the employer’s representative.
authorized: appointed by a duly constituted administrative
or regulatory authority.


auxiliary hoist: supplemental hoisting unit usually of
lower load rating and higher speed than the main hoist.

boom (of gantry cranes): an extension of the trolley runway
that may be raised or retracted to obtain clearance for
gantry travel.
boom (of overhead cranes): 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.

brake: a device, other than a motor, used for retardingor stopping motion by friction or power means.
brake, holding: a friction brake for a hoist that is automatically
applied and prevents motion when power to the
brake is off.
brake, mechanical load: an automatic type of friction brake
used for controlling loads in a lowering direction. This
unidirectional device requires torque from the motor to
lower a load but does not impose any additional load
on the motor when lifting a load.
braking means: a method or device used for stopping/
holding motion by friction or power.
braking, control: a method of controlling speed by removing
energy from the moving body or by imparting
energy in the opposite direction.
braking, countertorque (plugging): a method of controlling
speed by reversing the motor line voltage polarity or
phase sequence to develop torque in the direction opposite
the rotation of the motor.
braking, dynamic: a method of controlling speed by using
the motor as a generator, with the energy being dissipated
in resistors.
braking, eddy current: a method of controlling or reducing
speed by means of an electrical induction load brake.
braking, emergency: a method of decelerating a drive
when power is not available. The braking effort maybe established as a result of action by the operator, or
automatically when power to the drive is interrupted.braking,

hydraulic: a method of controlling or reducing
speed by means of displacement of a liquid.
braking, mechanical: a method of controlling or reducing
speed by friction.
braking, pneumatic: a method of controlling or reducing
speed by means of compressed gas.
braking, regenerative: a method of controlling speed in
which the electrical energy generated by the motor is
fed back into the power system.
braking, service: a method to decelerate crane motion
during normal operation.
bridge: that part of a crane consisting of one or more
girders, trucks, end ties, footwalks, and drive mechanism,
which carries the trolley or trolleys.bridge travel: the crane movement in a direction parallel
to the crane runway.
bumper (buffer): a 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. This device may be attached to the bridge,
trolley, or runway stop.


cab: the operator’s compartment on a crane.
cab, normal: operator’s compartment used for controlling
a cab-operated crane.
cab, skeleton: operator’s compartment used for occasional
cab operation of a normally floor- or remote-operated
crane.
cantilever frame: a structural member that supports the
trolley of a wall crane.
clearance: distance from any part of the crane to the
nearest obstruction.
collectors, current: contacting devices for collecting current
from runway or bridge conductors.
conductors, bridge: the electrical conductors located along
the bridge structure of a crane that transmit control signals
and power to the trolley(s).bridge travel: the crane movement in a direction parallel
to the crane runway.
bumper (buffer): a 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. This device may be attached to the bridge,
trolley, or runway stop.
cab: the operator’s compartment on a crane.
cab, normal: operator’s compartment used for controlling
a cab-operated crane.
cab, skeleton: operator’s compartment used for occasional
cab operation of a normally floor- or remote-operated
crane.
cantilever frame: a structural member that supports the
trolley of a wall crane.
clearance: distance from any part of the crane to the
nearest obstruction.
collectors, current: contacting devices for collecting current
from runway or bridge conductors.
conductors, bridge: the electrical conductors located along
the bridge structure of a crane that transmit control signals
and power to the trolley(s).

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