AT&T Bell System Plant Series Adjustment Procedure page 8

SECTION 032-709-701
INNER FOLLOW
SP~NG------~--------~11
Fig. 17 - Key Equipped With Crimp
Plunger Spring
*
2.20 Contact Follow: Fig. 17(B) - There
shall be a cohtact follow on all
contacts of:
Min 0.010 in.
Gauge by eye.
In make-before-break spring
combinations~
where the long, thin spring makes contact
with the
short~
heavy spring that acta as
a stop spring, this requirement does not
apply.
Note: See notefollowing Rq 2.16(a).
*
2.21 Contact Sequence
{a) Fig. 19A(A) -Normal Contact Sequence-
Break-make Combinations: Unless other-
wise specified, the normally closedcontacts
operated directly by a plunger spring of
an individual spring assembly shall break
before the normally open contacts of the
same assembly directly associated with the
plunger spring make by:
Min 0.006 in.
Gauge by eye.
Page 8
Fig. 18 - Key With Lever Operated
to One Side
(b) Fig. 19B(A) - Cross Sequence - Break-
make Spring Combinations on Ringing
Spring Assemblies or When Specified on
Circuit Drawing: Unless otherwise speci-
fied, all normally closed contacts oper-
ated by the throw of the lever shall break
before any of the normally open contacts
make by:
Min
o.oo6
in.
Gauge by eye.
(c) Other Contact Sequences: When speci-
fied on the circuit drawing.
2.22 Nonclick: Unless otherwise specified,
this requirement shall apply where the
lever unit is equipped with talking and ring-
ing spring combinations on the same unit and
shall apply to both combinations.
(a) Keys With Straight Levers: When the
lever is restored unrestrained from
the operated to the normal position, no
normally closed contacts of the opposite
side shall break and no normally open
contact~ of the opposite side shall make.