2.1.2
Dock Leveler Height Adjustment
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NOTE: Maximum vertical adjustment could be 900 mm
(36 inches), if needed.
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Provide a ramp whose incline can be adjusted to suit the height of the
freight carrier. Allow the loading ramp a minimum of [0] [610] mm [0] [24]
inches of vertical adjustment. Divide height adjustments [0] [305] mm [0]
[12] inch above and [0] [305] mm [0] [12] inch below the dock level to
provide coverage between [760] [685] [_____] mm [30] [27] [_____] inch and
[1370] [1295] [_____] mm [54] [51] [_____] inch above grade.
2.1.3
Dock Leveler Extension and Retraction
Extend non-fixed end of the dock leveler from a retracted position behind
the line of the loading dock platform bumpers to at least 300 mm 12 inch
beyond the forward edge of the dock platform bumpers so as to rest on the
bed of the freight carrier. The difference in length of the platform from
its fully retracted position to its fully extended position shall be
practically constant throughout the ramp, including the ramp extension.
2.1.4
Loading Ramp Compensation
Provide automatic compensation with ramp platform loaded or unloaded for:
2.1.4.1
Freight Carrier Out of Level
Out of level freight carrier bed condition (difference in elevation from
side to side at the rear of the carrier bed): Allow a minimum correction
of 25 mm one inch for each 450 mm 18 inch and maximum 100 mm 4 inch
correction of ramp width over the width of the ramp. Ensure the rear edge
of the ramp parallel with the rear of the frame in order to prevent
tripping or be a pinching hazard.
2.1.4.2
Loading and Unloading of the Freight Carrier
Provide mechanical type dock levelers with manual load compensation for
truck beds lowered below dock height. Provide [semi automatic] [manual]
air powered dock levelers for trailer movement. When the lip is extended
so as to rest on the bed of motor truck or trailer, provide compensation of
100 mm 4 inch for carrier spring deflection so that contact will be
maintained between lip and carrier bed.
2.1.5
Safety Devices
2.1.5.1
Electro-Hydraulic System
Provide velocity fuse, ballcheck valve, or other device to automatically
prevent a drop of more than 100 mm 4 inch of the lip, should the freight
carrier move away from the dock leaving the lip unsupported. Activate this
device with a static, dynamic, or impact load exceeding 10 percent of the
rated load on the lip and ramp.
2.1.5.2
Mechanical System
Include a three-position safety system to limit platform fall to dock level
SECTION 11161
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