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Bridge Crane
Electrical
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An electrical
conductor system employing flexible cables. (ANSI MH 27.1-1981)
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Technical lifting device
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Below hook
device
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A mechanism
composed of two or more rigid parts which move with respect to
each other for attaching a load to a hoisting device.
(ASME B30.20-1985)
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TENC
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Bridge Crane
Control
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Totally enclosed
fan cooled. (CMAA Spec. 70)
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TENV
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Bridge Crane
Control
|
Totally enclosed
non ventilated. (CMAA Spec. 70)
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Test, application breakaway force
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Below hook
device
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A test that is carried out in accordance
with instructions from the manufacturer of the lifting magnet
in order to establish the application breakaway force.
(ASME B30.20-1985)
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Test, rated breakaway force
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Below hook
device
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A test that is carried out per para.
20-3.3.2(b)(2) in order to establish the rated breakaway force.
(ASME B30.20-1985)
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Tongue switch.
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Monorail
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A switch
that contains one straight section of track, pivoted at one end,
which can be swung to various positions to connect with other
tracks for transfer of carriers from
one to the other. (ANSI MH 27.1-1981)
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Top running crane
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Bridge Crane
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An electric
overhead traveling crane having the end trucks supported on rails
attached to the top of the crane runway.(CMAA Spec. 74)
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Torque, full load (motor)
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Bridge Crane
Control
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The torque
produced by a motor operating at its rated horsepower and speed.
(CMAA Spec. 70)
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Torque, locked rotor
|
Bridge Crane
Control
|
The minimum
torque which a squirrel- cage motor will develop at rest, for
all angular positions of the rotor, with rated voltage applied
at rated frequency. Not applicable to
wound-rotor (slip-ring) motors. (WCH)
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Torque, motor breakdown
|
Bridge Crane
Control
|
The maximum
torque which a squirrel-cage or wound-rotor (slip-ring) motor
will develop with rated voltage applied at rated frequency, without
an abrupt drop in speed. (WCH)
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Torque, motor full load
|
Bridge Crane
Control
|
The torque
developed by an electric motor (A.C. or D.C.) to produce its
rated horsepower at rated full load speed. (WCH)
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Torque, motor pull up
|
Bridge Crane
Control
|
The minimum
torque developed by a squirrel cage or wound rotor (slip-ring)
motor during the period of acceleration from rest to the speed
at which breakdown torque occurs. For squirrel cage motors with
8% or greater slip, the pull up torque, the breakdown torque,
and the starting torque are all equal and occur at zero speed.
(WCH)
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Torsional box girder
|
Bridge Crane
|
Girder in
which the trolley rail is located over one web. (CMAA Spec. 70)
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Torsional forces
|
Bridge Crane
|
Forces which
can cause twisting of a member. (CMAA Spec. 70)
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Track
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Monorail
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The structural
member that supports the carrier or crane wheels.
(ASME B30.11-1993)
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Track capacity.
|
Bridge Crane
&
Monorail
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The design
load which consists of the rated load, impact allowance and load
imposed by the weight of the equipment.(ANSI MH 27.1-1981)
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Track curves
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Monorail
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Curved sections
of monorail track used to change the direction of carrier travel.
(ASME B30.11-1993)
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Track hangers
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Monorail
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Fittings
used to suspend the track from the supporting structure.
(ASME B30.11-1993)
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Track joint
|
Monorail
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The point
at which two sections of track are joined together. (ASME
B30.11-1993)
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Track joint
|
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The point
at which two sections of track are joined together. (ANSI MH
27.1-1981)
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Track opener
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Monorail
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A section
of monorail track arranged to lift or swing out of line to make
an opening through which a door may pass.
(ASME B30.11-1993)
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Tractor drive
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Bridge Crane
&
Monorail
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A motordriven
unit supported from wheels and propelled by drive wheel or wheels
bearing on the underside of the track. (ANSI MH 27.1-1981)
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Trolley
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Hoist
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A wheeled
mechanism from which a hoist is suspended to provide horizontal
motion of the hoist along a beam.
(ASME HST-4M-1991)
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Trolley
|
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See Carrier.
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Trolley (carrier)
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Hoist
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The unit
which travels on the bottom flange of the bridge girder and carries
the hoist.
(ASME B30-17)
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Trolley frame
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Hoist
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The basic
structure of the trolley on which are mounted the hoisting and
traversing mechanisms. (CMAA Spec. 70)
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Trolley speed
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Hoist
|
Trolley speed
is the rate of motion that a motor operated trolley (and hoist)
attains while traveling along a beam.
(ASME HST-4M-1991)
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Trolley suspended
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Hoist
|
Suspension
of hoist from a trolley. Hoist can be connected to trolley by
hook, clevis, or lug suspension, or the hoist can be integral
with trolley.
(ASME HST-4M-1991)
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Trolley travel
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Hoist
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The trolley
movement in directions at right angles to the crane runway.
(ASME B30-17)
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Truck
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Bridge Crane
|
A unit consisting
of a frame, wheels, bearings, and axles that supports the bridge
girders, the end ties of an overhead crane, or the sill of a
gantry crane unattended a condition in which the operator of
a crane is not at the operating Bridge Crane Control devices.
However, on a floor-operated crane, if the operating Bridge
Crane Control devices are within sight of the operator and within
a distance equal to the span of the crane, the crane. e should
be considered attended. (ASME B30.2-1990)
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True vertical lift
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Hoist
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In true vertical
lift, the load hook travels in a true vertical path between the
lower limit of lift and the upper limit of lift.
(ASME HST-4M-1991)
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Turntable
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Monorail
|
A track device
with a movable inner frame containing a straight section of track
which can be rotated with a loaded carrier on it to align the
section of track with other
tracks for the transfer of carriers from one track to another.
(ASME B30.11-1993)
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Two blocking
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Hoist
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Condition
under which the load block or load suspended from the hook becomes
jammed against the crane structure preventing further winding
up of the hoist drum. (CMAA Spec.
70)
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Under running crane
|
Bridge Crane
|
An electric
overhead traveling crane having the end trucks supported on track
attached to the bottom flanges of the beams; or supported on
bottom flanges of beams. These
beams make up the crane runway. (CMAA Spec. 74)
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Undervoltage protection
|
Bridge Crane
Control
|
A device
operative on the reduction or failure of voltage to cause and
maintain the interruption of power in the main circuit. (CMAA
Spec. 70)
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Upper block
|
Hoist
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A fixed block
located on a trolley that, through a system of sheaves, bearings,
pins, and frame, supports the load block and its load.
(ASME B30.2-1990)
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Vacuum
|
Below hook
device
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— pressure
less than ambient atmospheric pressure.
(ASME B30.20-1985)
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Vacuum lifter
|
Below hook
device
|
— a below-the-hook
lifting device for lifting and transporting loads in a fixed
attitude using a holding force by means of vacuum.
(ASME B30.20-1985)
|
Vacuum manipulator
|
Below hook
device
|
A vacuum lifter capable of repositioning
the load while suspended.
(ASME B30.20-1985)
|
Vacuum pad
|
Below hook
device
|
A device
which applies a holding force on the load by means of vacuum.
(ASME B30.20-1985)
|
Vacuum reservoir
|
Below hook
device
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The evacuated
portion of the vacuum system whose function is to compensate
for leakage into the vacuum system or to provide a vacuum reserve
in event of vacuum generator failure.
(ASME B30.20-1985)
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Variable frequency
|
Bridge Crane
Control
|
A method
of Bridge Crane Control by which the motor supply voltage and
frequency can be adjusted. (CMAA Spec. 70)
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Vertical lift
|
Below hook
device
|
A condition where the surface to which
a vacuum pad is attached is in a vertical plane.
(ASME B30.20-1985)
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Voltage drop
|
Bridge Crane
Control
|
The loss
of voltage in an electric conductor between supply tap and load
tap. (CMAA Spec. 70)
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W section
|
Bridge Crane
&
Runway
|
A wide flange
beam shape as defined by the American Institute of Steel Construction.
(CMAA Spec. 74)
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Wall mounted
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Hoist
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A type of
hoist mounting in which the hoist is mounted to a vertical surface. (ASME
HST-4M-1991)
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Web plate
|
Bridge Crane
|
The vertical
plate connecting the upper and lower flanges or cover plates
of a girder. (CMAA Spec. 70)
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Wheel load
|
Bridge Crane
&
Runway
|
The load
without impact on any wheel with the trolley and lifted load
(rated capacity) positioned on the bridge to give maximum loading.
(CMAA Spec. 70)
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Wheel yoke
|
Bridge Crane
&
Monorail
|
A frame on
which a pair of carrier (trolley) wheels are mounted. (ANSI MH
27.1-1981)
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Wheelbase
|
Bridge Crane
|
Distance
from center-to-center of outermost wheels. (CMAA Spec. 70)
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