The Public Works Departments at that activity may be
able to provide additional information pertaining to
these units. If paragraph "Power-Operated Switch
Throw Mechanism," is used, then paragraph
"Manually-Operated Switch Throw Mechanisms and
Housings," must be used.
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a.
Provide switch points in a single crane track turnout (including
turnouts containing shared railroad tracks) to operate
simultaneously by a single throw mechanism.
b.
Provide each switch with a manually operated throw mechanism.
[Provide switch throw as indicated.] [Provide switch throw
designed and fabricated by the manufacturer of the switch point.]
Base the design on a [bell crank] [lever] operator principle so
that the switch can be readily and easily operated by one person
without causing damage to the linkage or component parts.
c.
Provide throw mechanism to automatically lock into place at the
end of the throw in both operating positions.
d.
Provide throw handles which indicate the position of the switch,
easily accessible, and visible to the crane operator
e.
[Provide visible indicators capable of being seen by the crane
operator to indicate position of switch.]
f.
Provide throw mechanism of a heavy-duty type for specific use with
double-flange wheel crane rail fittings.
g.
Provide linkage oriented 90 degrees to the switch tongue.
h.
All component parts shall be readily accessible to allow for
inspection, cleaning, maintenance and easy removal and replacement
of parts.
i.
Turn buckles shall be of the open type to permit inspection to
ensure engagement of ends of threaded rods.
j.
Provide rods and throw linkage components adequately sized and
laterally supported to prevent bending and buckling during
operation.
k.
Provide box housing frames bolted to base plates and equipped with
heavy-duty cover plates designed to fit neatly over the housing
frame.
l.
[When an unequal throw is required for crane track switch points,
it shall be achieved by the use of mechanical bar linkage and not
by use of lost motion spring action.]
m.
[Lost motion utilizing a spring system action may be employed to
facilitate the operation of a railroad switch used in conjunction
with the throw of a crane rail switch.]
[2.2.2.8
Power-Operated Switch Throw Mechanism
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SECTION 14606N
Page 19
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