Grade exceeds 10 percent; therefore, length of dock
leveler should be increased until grade is 10
percent or less. Use 3000 mm (120 inch); that way
grade equals 300 mm (12 inch) divided by 3000 mm
(120 inch) times 100 which equals 10 percent.
If dimensions for width and length of dock leveler
ramp platform surface vary from that specified, so
indicate.
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The live load carrying surface of the ramp shall be [1825] [_____] mm [6]
[_____] feet plus or minus 75 mm 3 inch wide and [3050] [_____] mm [10]
[_____] feet plus or minus 225 mm 9 inch long with the dock leveler lip
retracted.
2.2
OPERATION
2.2.1
Mechanical Control
Mechanical chain-activated, with extension-spring operation and
counter-balance non-manual, raising and lowering system. Once the freight
carrier has departed, manually return the platform to the stored, level
position. Ensure the ramp, in its stored position capable of being lowered
below dock platform level without extending the lip of the ramp.
2.2.2
Electro-Hydraulic Control
Provide each dock leveler with a pushbutton station to activate motor,
pump, and valves.
2.2.2.1
Pushbutton
Heavy-duty dust tight and oil tight type rated in accordance with NEMA ICS 2,
Part ICS2-216 for alternating current. To prevent accidental operation and
damage, ensure each button to be recessed in its station or be protected by
a peripheral collar (ring) or shroud. Indelibly identify each pushbutton
by means of cast or etched letters on the station. Provide emergency
"STOP" button of momentary type with manual reset or continuous pressing
(constant pressure) type. This stop button shall stop all dock leveler
movement, regardless of the position of the ramp or lip at the time the
"STOP" button is depressed.
2.2.2.2
Hinged Lip Ramp Movement
Apply continuous pressure on the "UP" button to raise the loading ramp,
descend the lip onto the bed of the freight carrier. Once the freight
carrier has departed, the lip shall automatically fall or retract to its
down position, and the ramp shall return to its stored dock level position.
The ramp, in its stored position, shall have the capability of being
lowered below dock level without extending the lip of the ramp to service
truck end loads which may be lower than loading dock surface position.
Allow 4 to 6 seconds to fully extend or retract the lip.
2.3
CONSTRUCTION AND MATERIALS
Construct all load carrying parts of forged or welded steel.
SECTION 11161
Page 11
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