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P a g e
angle, and stop crank for correct position.
If the offset bearing has an adjustable crank, it is
sometime necessary to add ¼” to ½” to the trial
radius given on the control drawing to get
required travel to switch blades. This additional
length allows for lost motion and clearances in
pin holes and will also provide a definite audible
sound accompanied by a reasonable amount of
deflection in the structural members when the
crank crosses the dead canter position. This
serves as a signal to the operator that the switch
is either fully open or closed.
Step 8—Adjust the Multi-Angle Crank
The crank is identified in Fig. 6. This crank is
supplied in the operation pole unit connected to
the offset bearing. It permits 330˚ angular
adjustments with crank location every 10˚ which
allows adjustments to within 5˚ of desired
position. In some adjustments, the adjustable
crank may be in such a position to interfere with
the stop projection on the switch crank. If this is
the case, remove this projection. The other two
poles will regulate the blade travel on this unit.
The multi-angle crank should be set so that it
forms an angle of approximately 45 degrees with
an offset link in either switch position, closed or
open. On 5” base circle switches the multi-angle
crank is installed on the top of the switch crank,
on 3” base circle switches it is installed on the
bottom.
Step 9—Install Interphase Rods
With all blades in the closed position, install the
interphase rods and offset crank rod as follows:
a.
Lengthen the interphase rods that are in
compression during opening, as much as
possible, yet allowing for the pins to be
inserted.
b.
On the rods that are in tension during
opening, shorten them as much as possible,
yet allowing for the pins to be inserted.
c.
The offset crank rod between the outboard
bearing and the driven switch should be
handled the same way
d.
For lubrication of pins and bearing areas, see
Table 2.
Adjustable Clevis
Connecting Link
Offset Bearing Rod
Rotor Bearing
Coupling
Operating
Pipe
Flexible Ground
Strap
Manual
Worm-Gear
Operator
Pipe Splice
and Pipe
Guide Plate
Supplied Only
When Required
Vertical
Operating Pipe
Handle Clamp
Telescopic
Handle
Length 3
to 5 Feet
Kirk Key
Interlocking
Interlocking Plate
( Optional)
Provision
for
Padlocking
Adjustable Lock
Plate with Position
Indication
Fig. 8 Standard Offset-Torsional Mechanism on Standard
Support Structure
Fig. 7 Manual Worm Gear Operating Mechanism
Summary of Contents for DR7
Page 1: ...IB DR7 A May 2012 ...
