AT&T Bell System Plant Series Adjustment Procedure page 3

(
(
PLUNGER
RETAINING
SCREW - - - - k f l l l
SPRING ASSEMBLY
Fig. 3 - Method of Checking Contact Sepa-
ration, Contact Follow,and Con-
tact Sequence
(b) No. 406A Key: The pressure shall be:
Test - Min 155 grams
Rea'd.lust - Min 170 grams
Use the No. 62B gauge.
*
2.07 Flexible Contact S ri Position: The
flexible contact springs springs
which are made of two parts riveted together)
shall rest on their respective stop springs
when the plunger is in the unoperated posi-
tion for normally open contacts and in the
operated position for normally closed con-
tacts. It is not necessary for the spring
to rest on the stop spring for its entire
length, but it must rest on the end of the
stop spring nearest the contact.
Gauge by eye.
*
2 .o8 Plunger Spring Position
(a) Fig. 6(A) - Both plunger springs shall
rest against the plunger in the un-
operated position.
Gauge by eye.
(b) Fig. 5(A) - No. 406A Key:
There shall
be a clearance between the plunger
and the plunger springs in the unoperated
position of the key.
Gauge by eye.
ISS 5-D, SECTION 032-709-701
TWO WAY THROW
PLUNGER---------
~..-+-.-'"+"'!
Fig.
4 -
498-type Key
*
2.09 Contact Follow
(a) Fig. 6(B) - Unless otherwise specified,
there shall be a follow on all outside
contacts of:
Min 0.010 in.
Gauge by eye.
This requirement need not apply to the
normally closed contacts on the No. 406J
key.
(A)
Fig. 5 - 406-type Key
(b) Fig. 6{C) - The follow on the inside
contacts shall be sufficient to
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