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Патент USA US2112375

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March 29, 1938.
E. D. MEAD
2,112,375
TIMING MECHANISM
Filed March 10, 1936
8 Sheets-Sheet l
INVENTOR
E. D. MEAD
A T TORNE V
March 29,1938.
E, D, MEAD
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2,112,375
TIMING MECHANISM
Filed March 10, 1936
8 Sheets-Sheet 2
BY
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March 29, 1938.
2,112,375
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Filed March 10, 1936
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Filed March 10 ,
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March 29, 1938.
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Filed March 10, I936
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March 29, 1938.
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March 29, 1938.
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2,112,375
TIMING MECHANISM
Filed March 10, 1936
8 Sheets-Sheet 7
INVENTOR
'
By 5.0. MEAD '
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A T TORNEV
March 29, 1938.
E. D. MEAD
2,112,375
TIMING MECHANISM
Filed March 10, 1936
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Patented Mar. 29, 19.38 .
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UNITED STATES PATENT OFFICE
2,112,375 _
TIMING MECHANISM '
Edward D. Mead, Caldwell, N. I, assignor to Bell
' Telephone
Laboratories,
Incorporated,
New
York, N. Y., a corporation of New York
Application March 10, 1936, Serial No. 68,073
11 Claims. (Cl. 161—19)
This invention relates to timing mechanisms form applicable for a telephone connection where
and particularly to devices of this character used the charging rate for the initial period differs
for measuring intervals of conversation in a telephone system to determine thereby the appro5 priate charge for the service rendered. The invention is applicable not only to local calls from
subscribers' lines or coin box lines where the
charges may be uniform for the initial period and
each overtime period but is also applicable where
from the charging rate for an overtime period of
the same duration each. timing unit has one
gear wheel engageable with the constant speed
shaft for measuring the initial period and a sec
0nd gear wheel engageable with said shaft after
the completion of the initial period for measuring
any overtime period and for closing the charging
10 the charges depend upon the zone called as well
as the duration of the call.
circuit in accordance with the number of revolu- 10
tions required to measure the overtime period.
Tensioned spring means may be employed for
An object of the invention is to simplify and
improve devices used for measuring and indieating intervals of time to render them more
15 accurate and reliable in their operation and to
render them capable, with only minor alterations,
of assessing charges according to a variety of requirements with respect to initial and overtime
charges.
‘
The timing mechanism of this invention is particularly applicable for use with the message register circuits disclosed in the copending application of F. J. Scudder Serial No. 68,044, ?led March
10, 1936, issued as United States Patent 2,089,438
~35 on August 10, 1937.’
In its preferred form, the invention utilizes a
common driving shaft which may be rotated at a
constant speed and a number of electromagnetic
devices having timing elements which are argg ranged to be engaged with' and disengaged from
the driving shaft much in the manner disclosed
in my earlier Patent No. 1,993,793 issued March
12, 1935.
Each electromagnet has an armature which is
:35 actuated when a given telephone connection is
established to move a slidable pinion on the
driving shaft into engagement with a gear wheel
of a suitable timing unit. The consequent rotation of the gear wheel controls the timing and
40 charging functions in accordance with the circuit
requirements. In one form of the invention ap-
plicable for a telephone connection where the
charging for the initial period is the same as for
an overtime period of the same duration, the said
45 gear wheel is adapted to rotate as many revolutions as needed to measure a given call, closing
restoring each wheel to normal after the given
connection has been broken. Other features of
the invention will appear in the following de- 15
tailed description.
Referring to the drawings:
Fig. 1 is an assembly view of the timing mech
anism for local telephone calls illustrating the
driving shaft and the manner in which the several 20
timing units are mounted;
Fig. 2 is a top View Of 0116 Of the timing units;
Fig. 3 is a side viewand Fig. 4 an end view
of one of these units;
Fig. 5 is an end view of the armature hinge of 25
3;
Fig- 6 is an enlarged View in perspective of an
arrangement for keeping under Constant ten
sion the restoring spring for thu rotatable mem
her of the timing unit;
30
FigS- 7 and 8 illustrate the apparatus of Fig- 6
in di?‘erent positions;
Fig. 9 is an alternative to the apparatus of
Fig. 6;
Fig. 10 is a diagram illustrating the manner 35
Of Operation 0f the timing unit electrical Contacts
during a COHVBI‘SatiOH period being measured
thereby;
FigS- 11 '00 16, inclusive, are Schematic OiMW"
ingS illustrating the timing device in its Various 40
Stages of Operation;
-
Fig- 17 is an assembly View Of another type of
timing ‘mechanism for zone calls where the
charging for the overtime period is on a different
basis than the initial period;
45
Fig. 18 is a top View. Fig- 19 a Side View and
the charging circuit shortly after the beginning Fig. 20 an end view of one of the timing units of
of each revolution. A tensioned spring serves to -Fig- 17;
restore the gear wheel to its normal position after
Figs. 21 and 22 are bottom views of the timing
to the connection has been broken and special unit of Fig. 18;
a
50
means are provided for maintaining a substanFig. 23 is an "nlarged sectional view of a part
tially constant tension on said spring when said of the timing unit of Fig. 18;
wheel makes more than one complete revolution
Fig. 24 illustrates details’ of the overtime meas
in the measurement or a given connection before uring element ‘of Fig. 18;
55 being returned to its normal position. Inanother
Figs. 25 and 26 are end view: of the gear 55
2,112,873
2
wheel of the initial period charging unit of Fig.
18;
Figs. 27 and 23 illustrate details of the restoring
spring restraining means;
,
Fig. 29 is _a diagram illustrating the manner
33 fastened to the inner face of the gear wheel II.
The purpose of cam 3| is to .maintain a substan
tially constant tension on helical spring I3 in
spite of the number of complete revolutions made
by wheel II in timing a given telephone connec
tion as will be explained later. Also mounted on
of operation of the electrical contacts of the tim
ing unit of Fig. 18 during a conversation period bracket 33 is an annular ring 31 which supports
a ?exible cam 33 for operating certain electrical
being measured thereby;
Figs. 30 to 3'7, inclusive, are schematic drawings contacts to be described later. ‘For the purpose
illustrating the timing device of Fig. 18 in its , of operating still other electrical contacts there 10
is mounted on the inner face of wheel I | a cam 39-.
various stages of operation; and
Each timing unit has an electromagnet 42 best
Fig. 38 shows a portion of a machine switching
seen
in Fig. 3. One end of its armature 43 rests
system of the cross-bar type utilizing a local tim
ing unit assembly of the ‘type of Fig. land a upon the ?attened portion 43 of the magnet core
zone timing unit assembly of the type of Fig. 17. and the armature is hinged by two non-magnetic 15
A detailed description will ?rst be given of the spring strips 44, 43 (Figs. 3 and 5) which are
riveted to the corners of the rear end of the arma
timing device of Figs. 1 to 16, inclusive. This de
vice (Fig. l) comprises a mounting frame I on ture and are clamped to core portion 43. These
which is supported a driving motor 2 and also a
20 shaft 3. The motor 2 is connected to shaft 3 by
means of gear wheels 4 and 3. Motor 2 is ar
ranged to be operated at a constant speed so that
the rotation of shaft 3 may serve to accurately
measure intervals of time. Frame I also sup
25 ports a plurality of timing elements only two of
which are shown as indicated generally by the
reference character 3.
The driving shaft 3 is
I equipped with a series of slidable pinions 1 one
for ‘each timing ‘element, and the pinions are
keyed to the shaft in the longitudinal groove 3.
Each pinion 1 is adapted to be moved into engage
ment with-the gear wheel forming a part of the
corresponding timing element.
knife edge pivot for the armature.
Armature 43 carries a spring member 43 (Fig.
3) having a tongue 41 which rides in the annular 25
groove 43 in its associated pinion 1. When the
electromagnet 42 is energized the movement of
armature 43 to the left as viewed in Fig. 2 is suiii
cient to cause the teeth- on pinion 1 to engage the
teeth on wheel II and start the rotation of wheel 30
II in a counterclockwise direction as viewed in
Fig. 3, wheel || before engagement with pinion 1
being in a de?nite zero position as determined by
comprises a bracket 3 supported by the main
lug |1 against spring stop l3. It is, of course, to
be assumed that electromagnet 42 is energized at 35
the moment the called station has answered and
frame I and supporting a ?xed shaft l3 on which
is rotatably mounted a large gear wheel I I. This
connection is broken so that the amount of ro
The individual timing element, the details of
' which are shown more particularly in Figs. 2 to 6,
gear wheelll is normally disengaged from its
driving pinion but when its driving pinion ‘I 'is
moved a short distance to the left as viewed in
Fig. 1 the teeth of the gear wheel || mesh with
the teeth l2 on its driving pinion, thereby rotat
ing the wheel II as long as it is in engagement
with its pinion.
Gear wheel ii is normally biased to a zero posi
tion by a tensioned helical spring l3 which tends
to keep a lug l1 on the wheel against a spring stop
l3 (Fig. 2), that is, the restoring spring l3 tends
to rotate wheel || clockwise as viewed in Figs. 3
and 6. Referring more particularly to Fig. 6, one
end l3 of this restoring spring is held against a
shoulder 23 of a collar 2| fastened to ?xed shaft
i3. The other end 22 of the helical spring is
suitably fastened to the inner face of wheel I I so
that the counter-clockwise rotation of wheel ||v
(Fig. 6) by its pinion 1 tends to wind up the
helical ‘spring as the rotation continues. At
tached to wheel II and rotatable therewith is an
60 elongated sleeve 23 surrounding the ?xed shaft
l3 and acting as a support or, guide for the turns
of the spring. The ?rst few‘turns of the spring
adjacent wheel II are supported on the collar 24
of sleeve 23 while intermediate turns‘ are 51101‘
65
springs 44, 43 are gim an initial bias so that
when they are clamped to the core they press the 20
rear end of the armature ?rmly against the core
to avoid magnetic leakage while still affording a
mally out of contact with sleeve 23. The outer
turns of the helical spring rest on a sleeve 23
formed as a part of stationary collar 2|. The
outer end of sleeve 23 freely rotates within the
stationary sleeve 23. Located on the outer end of
70 ?xed shaft I3 is a nut 23 having an inner shoulder
33 acting as a bearingfor an annular ring-shaped
cam 3| having two upwardly extending projec
tions 32, 33 and an arcuate slot 34 normally con
taining end l3 of helical spring l3. Cam 3| is
13 driven by a tongue 33 projecting from a bracket
that electromagnet.42 is deenergized when the
tation of wheel || while electromagnet 42 is en
ergized is a measure of the duration of the tele
phone connection and can be utilized in making
the appropriate charges therefor.
The bracket 3 supports a plurality of electrical
spring contacts which will be best explained by
reference to Figs. 2 and 11 both of which show 45
the gear wheel I I in its normal zero position with
lug l1 against spring stop l3. The subsequent
Figs. 12 to 16 show the wheel II and its related
apparatus in other relative positions. With the
electromagnet 42 deenergized its armature 43 is 50
maintained in its outer position by a spring 43
‘acting against the armature. Spring contact 33
is normally biased to make electrical contact with
the stiff contact spring 3|, contacts 33, 3| being
termed the ground contacts D. Spring 33 car 55
ries a lug 32 projecting towards the ?exible cam
33 carried by the bracket 33 on wheel II but the
normal path of movement of cam 33 does not lie
in the pathof lug 32. However, armature 43 car
ries a roller 33 with which the ?exible cam 33
will contact when the wheel I I is rotated counter
clockwise to throw cam 33 into the path of lug 32
to cause spring 33 to break its contact with mem
ber 3| and make contact with the spring 33. Con
tacts 33, 33 are termed the charging contacts C.
05'
The spring pile-up also includes two stlf! springs
31 and 33 and two ?exible springs 33, 33. Flexi
ble spring 33 is normally biased to make contact
with stiff spring 31 but when the wheel II is
in its zero position as in Fig. 11 the cam 33 on 70
wheel || presses against a lug 3| mounted on
spring 33 to keep electrical spring contacts 31,
33 separated as long as wheel H is in its zero
position. Lug 3| also has an' extension 32 which
serves to press the ?exible spring contact 33 13
2,112,375
against spring 60 as long as cam 39 is opposite
lug 6|. Contacts 51, 58 are hereinafter termed
the holding contacts A and contacts 59, 60 the
off-normal contacts B.‘ Therefore, with the
wheel H in its zero position against stop l8, the
63, 64, 65 and 56 represent the condition during
the measured period of the holding contacts A, the
off-normal contacts B, the charging contacts C
and the ground contacts D, respectively. It will
be seen that shortly after the beginning of the
holding contacts A are open, the‘oil-normal con
measured period the holding contacts are closed
and the oif-normal contacts are opened and they
tacts B are closed, the charge contacts C are
open and the ground contacts D are closed. The
functions of these contacts will be described brief
10 ly later but for a more detailed description refer
ence is made to the Scudder application men
tioned above.
4
v
When the electromagnet 42 is energized its
armature 43 acting against retracting spring 49
brings pinion 1 into engagement with the gear
wheel H and also by means of roller 55 bends
?exible cam 38 into the path of lug 52 on spring
50. The armature is shown in its actuated posi
tion in Fig. 12 whereupon the gear wheel H
starts turning in the direction indicated by the
arrow. Shortly after the turning movement has
started, cam 39 rides 01f lug 6| and ?exible spring
58 is then free to follow its natural bias to close
holding contacts A and open the off-normal con
25 tacts B as shown in Fig, 13. Contacts A remain
closed and contacts B remain open‘until cam 39
has again reached lug 6 I. Shortly after the hold
ing contacts A have been closed the ?exible cam
38 contacts momentarily with lug 52 to open the
30 ground contacts D and close the charging con;
tacts C as shown in Fig. 14.
As soon as lug 52
becomes free of ?exible cam 38 the ?exible spring
5!] follows its natural bias to open the charging
contacts C and close the ground contacts D as
shown in Fig. 15. The condition of the contacts
shown in Fig. 15 holds duringv the greater part
of a‘complete revolution of wheel ll.
Fig. 16
shows the condition just before wheel l i has ?n
ished a complete revolution and one complete
revolution will have taken place as soon as wheel
I I has moved far enough from its position of Fig.
16 to allow spring stop it to drop behind the
rear edge of lug [1. It will be apparent from Fig.
16 that just prior to the completion of one revo
lution of wheel ll, lug 6i rides up on cam 39 to
again open holding contacts A and close on
normal contacts B.
It will be apparent that gear wheel ll may
make only a partial revolution or as many com
plete revolutions as are needed for timing the
particular telephone connection for which the
timing unit has been selected. If the telephone
connectionelasts for a time corresponding to less
than one complete revolution of wheel ll it will
55 be apparent that the charging contacts C will be
operated only once but if the telephone connec
tion continues for a fraction of an additional
turn of wheel H the charging contacts will again
be actuated as it will be seen from Fig. 16 that
60 only a small additional movement of ?exible con
tact'38 is needed to cause the second closing of
the charging contacts C,
-
3
'
The diagram of Fig. 10 illustrates the manner
in which the contacts are operated with respect
to time. In Fig. 10 it is assumed that the time
required for a complete revolution of wheel H
is ?ve minutes and that the charging contacts are
to be operated once for each ?ve-minute period
or fraction thereof. The two vertical lines Si
and 58 are intended to represent the duration of
a ?ve-minute period where vertical line 61 rep
vresents the beginning of the period with wheel
I l. in zero position, and vertical line 38 represents
the end of the ?ve-minute period with the wheel
75 having completed exactly one revolution. Lines
continue in their altered position until just prior
to the elapse of the ?ve-minute period when the
holding contacts are opened and the off~norn1al
contacts closed. At the beginning of the initial
period and shortly after the holding contacts and
off-normal contacts are operated the charging
contacts C are momentarily closed, accompanied
by the momentary opening of the ground con—
tacts D. If the measured period extends beyond
the initial ?ve-minute period it will be obvious
that the contacts again are operated in the same
manner as at the beginning of the initial period.
As previously stated, the timing unit of this L
invention as above described contemplates hav
ing gear wheel ll make one complete revolution
for the initial period of a conversation being
measured and to have the wheel make as many
additional revolutions or fractions thereof as are
needed to measure the overtime period. It is,
therefore, necessary to provide means for pre
venting the restoring spring l6 from becoming
wound too tightly. Preferably, automatic means
are provided for unwinding the helical spring l6 30
one turn whenever the wheel II by its rotation
has wound the spring up substantially one turn.
A preferred arrangement is disclosed in Figs. 6,
'7 and 8. As previously described, with reference
to Fig. 6, one end of helical spring is fastened to 1.
wheel ii and the other end lics against the sta—
tionary stop 20 so that as the wheel ll revolves
counter-clockwise the spring is wound up. The
normal position for driving tongue 35 with the
wheel in zero position is adjacent shoulder 32 of 40
cam ring 3i as shown in Fig. 3. Fig. 6 shows
wheel it after it has been rotated about 90 de
grees from its normal position as indicated in
that ?gure by the angular relation of spring
stop 98 to lug ll. When the wheel ll starts re-
.
volving counter-clockwise under the action of
pinion l tongue 35 moves with the wheel and
after the wheel has moved about 90 degrees as
shown in Fig. 6 the tongue 35 contacts with
shoulder 33 and rotates cam ring 3| along with ;
the wheel. Tongue'35 continues to drive cam
ring 3i counter-clockwise and ?nally reaches the
position shown in Fig. 7 where the wheel has
completed one revolution and has also turned
through a small fraction of another revolution.
At this position of big. 7 cam surface ‘ll con
tacts with end iii of the helical spring and with
the further counter-clockwise movement of cam
ring 3! as shown in Fig. 8 raises the spring end i9
over the top of stationary stop 29 thereby freeing 60
that end of the spring and alldwing it to start un
winding.
However, spring end
[9 in ?ying
around the nut 29 enters slot 36 in the cam ring
and pushes cam ring 3| forwardly until the spring
end again comes to rest‘ against stop 20. The
spring, therefore, unwinds only one turn at a
time and will not unwind another turn until the
wheel II has completed another revolution from
its position in Fig. 8. If the wheel H is disen
gaged from its driving pinion 7 prior to the com
pletion of its ?rst revolution it will be obvious
that whatever winding-up of spring l6 took place
will be annulled by the clockwise restoring move
ment of the wheel.
If we assume that the wheel
I1 is disconnected from‘ its driving pinion when 75
:1
4 .
9,112,878
the wheel has reached its position of Fig. '1 it erence character I83. The driving shaft I82 ad
Jacent each timing unit is equipped with two
follows that the wheel will be restored to its nor
slidable pinions I84, I88 keyed to the shaft in
mal position by only a small clockwise move
ment required to bring lug I1 into engagement the longitudinal groove I88. The pinions I84 and
with stop I8 and with such an assumption the I85 are adapted to be selectively engaged with gear
helical spring remains wound by one additional
turn until the wheel is again driven by pinion 1
whereupon the spring end I! will be released from
stop 28 as soon as the wheel has been moved away
ll) from its zero position through an angle indicated
by the difference in the positions of shoulder 33
in Figs. '7 and 8. In order that this unwinding
mechanism may be effective without impairing.
the main function of the spring to supply a re
15 storing force to return the wheel I I to its normal
position, a lost motion connection between driv
ing tongue 35 and cam ring 3| is desirable. The
arcuate slot 34 should'extend far enough towards
shoulder 33 that there will be no danger when
20 tongue 35 is against shoulder 32 that spring end
l3 will contact with the closed end of slot 34 in
stead of stop 28.
An alternative form of the unwinding mecha
nism for the helical spring is shown in Fig. 9.
25 The portion of a timing unit shown in Fig. 9
is identical with that disclosed in the earlier ?g
ures except for the unwinding mechanism. The
gear wheel 1 is shown turned substantially 90
degrees counter-clockwise from its zero position,
30 which is determined by having lug 16 against
spring stop 11. Wheel 15 is suitably mounted
for rotation about a ?xed shaft 18 and the wheel
15 carries a drum 18 about which is wrapped the
helical restoring spring 88 one end of which is
fastened to‘wheel 15 and the other end 8i passes
over a stationary nut 82 and is held against a
shoulder 83 on said nut.
The outer end of drum
1!! is cut away to form a bearing for a cam ring 84
which has a cam surface 85 and an arcuate
40 shaped arm 88 above an elongated slot 81.
The
outer edge of drum 19 which is of reduced diam
eter to support the cam ring 84 also has a radial
wedge-shaped slot de?ned by shoulders 88 and
98 therein into which ?ts loosely a projection 89
45 from the inner side of the cam ring 84. With
wheel 15 in its zero position, projection 88 is nor
mally adjacent shoulder 98. As the wheel begins
rotating counter-clockwise, projection 88 ad
wheels individual to each timing unit.
'
The individual zone timing unit the details of.
which are shown more clearly in Figs. 18 to 28
comprises an L-shaped bracket I81 fastened
to the main frame I88, said bracket supporting 10
a ?xed hollow shaft I88 (Fig. 23) on which is
rotatably mounted a large gear wheel I83. This
gear wheel I88 is normally disengaged from its
driving pinion I84 but when its driving pinion
is moved by means hereinafter- described, the
teeth of gear wheel I88 mesh with teeth II8 on
driving pinion I84 thereby rotating wheel I88
until their engagement is broken. Gear wheel
I89 is utilized for timing the initial period while
another gear wheel H3 is employed for timing 20
any overtime period. Means hereinafter de
scribed are provided responsive to the substantial
completion of a revolution by wheel I88 for mov
ing pinion I85 so that its teeth mesh with the
teeth of gear wheel I I3 whereby wheel I I3 may be 25
rotated as many revolutions as required to mea
sure the length of the overtime period.
Referring more particularly to Fig. 23, the over
time wheel Il3 is fastened to a shaft II4 which
is rotatably mounted within the ?xed hollow 30
shaft I88 and projects beyond it at both ends.
The initial wheel I88 does not bear directly on
?xed shaft I88 but is 'fastened to one end of an
elongated sleeve II5 which is rotatable about
shaft I88. Around sleeve I I5 is a helical restor 85
ing spring I I6 one end I I1 of which (Figs. 23, 24)
is anchored by insertion in a hole in a rotatable
annular disc II8 fastened on sleeve H5, and
therefore, rotatable therewith. Disc II8 may
have projecting lugs II9 (Fig. 24) which fit into 40
slots I28 in. the end of sleeve iii, the disc II8
being held in place by a threaded,collar Hi.
The other end I22 of helical spring H8 is held
stationary by passing through a hole in station
ary arm I23 (Fig. 21). The rotatable sleeve H5 45
is held in place by a nut I24 threaded on the
end of stationary shaft I88 the opposite end of
sleeve II5 bearing against shoulder I25.
The rotatable shaft H4 at one end carries the
overtime wheel I I3 and its other end has fastened
thereto a sleeve I28 which extends beyond the
end of shaft II4. Aligned with the axis of shaft
II4 but supported independently thereof is a sta
tionary pin I21 fastened to a mounting bracket
I28. On stationary pin I21 is mounted a sleeve
spring to unwind one turn in the same manner as
I3I the open end of which overlaps the adjacent
described for Fig. 6. The main difference be
end of rotatable sleeve I26. Sleeve I3I is held
tween Figs. 6 and 9 is in the manner of actu- - in place by a threaded nut I32 having a portion of
Ming the cam which temporarily frees the spring reduced diameter which acts as a bearing for a
end from its retaining stop. Further description cam member I33. Rotatable sleeve I28 and sta 60
60 of Fig. 9 is, therefore, believed unnecessary.
tionary sleeve I3I act as supports for the tensioned
A detailed description will now be given of an helical spring I34 used for biasing the overtime
alternative form of the timing mechanism dis
gear wheel “3 to its normal position. One end
closed in Figs. 1'1 to 3'1. The timing mechanism I35 of the spring is anchored in a hole in a cam
of these ?gures is particularly designed for use member I38 mounted on rotatable sleeve I26
65 in operating message registers where the charge while its other end I31 (Fig. 20.) normally lies
for and the duration of each overtime period against a shoulder I38 on sleeve I3I (similar to
may be different from the charge for and dura
shoulder 28 of Fig. '7).
tion of the initial period.
Since gear wheel H3 is adapted to rotate any
The assemblyof these timing devices for zone
desired
number of revolutions it, therefore, is
70 calls comprises, as shown in Fig. 17, a mounting
necessary to provide means for preventing its
frame I88 on which is supported a constant speed
vances until it strikes shoulder 88 and thereafter
the cam ring is rotated with the wheel 15, which
rotation, if continued more than a complete rev
olution, will cause cam surface 85 to contact with
spring end 8| and raise the end of the spring
over the top of stop 83 thereby allowing ‘~ the
driving motor IN and a shaft I82 connected
therewith by suitable gearing. Frame I88 also
supports a plurality'of timing units only two of
-15 which are shown indicated generally by the ref
restoring spring I34 from becoming wound too
tightly and the means provided is essentially the
same as that of Figs. 6, '1 and 8 in that the spring
is allowed to unwind one turn every time gear 75
5
2,112,375
~A_r;7\—.
teeth I10 on pinion I05 into engagement with
wheel I I3 rotates slightly more than one complete
revolution. Fastened to bracket I36 is- a laterally
extending arm I39 which extends between two
the teeth on gear wheel H3 and start its rota
tion. Overtime wheel H3 is normally biased to
its zero position with lug I1I against spring stop
I12 (Fig. 21) due to its restoring helical spring
, spaced upwardly extending shoulders I40, I4I
(Fig. 19) on cam ring I33 so that the rotation of
bracket I36 also rotates camring I33. This in
sures that cam surface I42 of cam ring I33 once
each revolution will serve to lift spring end I31
over shoulder I38 to permit the spring to un
wind one turn as previously described with re
I34. Wheel I I3 will now begin rotating to meas
ure the overtime period of the telephone connec
tion and will continue rotating as many com
plete revolutions as rare needed. During the
movement of wheel II3 spring I34 will unwind 10
one turn for each complete revolution of the wheel
spect to Figs. 6, 'l and 8.
in the same manner as described in connection
with Figs. 6 to 8.
The unwinding arrangement for spring I34
differs in one respect from that of Figs. 6, 7 and 8
Certain electrical contacts are controlled by
in that a thin metal collar I45 (Figs. 27, 28) is initial wheel I09 and overtime‘wheel H3 and the 15
inserted between stationary sleeve I3I and the operation of these contacts will now be described
last few turns of the spring. This sleeve I45 has . with special reference to Figs. 30 to 3'1.
an upturned edge I46 with a slot I41 into which
Fig. 30 shows the wheels and the contacts con
?ts the end I31 of the restoring spring. When trolled thereby in their normal position before
cam surface I42 lifts spring end I31 over shoulder the timing unit has been seized to measure a
I38 the spring end is still retained in slot I41 so particular connection. Armature I49 has a lat
that collar I45 rides around with the spring end erally extending member I8I having two sepa
in the unwinding process. Collar I45 serves to rated arms I82, I83 (Figs. 22, 30, 31). Arm I82
reduce the velocity with which end I31 travels supports a stud I84, while arm I83 has a stud
around nut I32 and. hence reduces the danger
I85 and a projection I86 acting as a stop as will 2.5
that end I31 will 'be broken by the force with be explained later. Contact spring I81 carries
which it hits against shoulder I38.
a stud I88 which passes through an aperture in
Each timing unit I03 has an .electromagnet contact spring I89 to contact with the stiff con- _
I48 (Fig. 19) which is energized over suitable tact spring I90. Spring I90 is biased to press
circuits when the telephone connection is estab
on stud I81 and normally maintain an extension
lished the duration of which is to be measured of spring I81 against a stationary stop I9I. This
by the timing unit. Its armature I49 has a spring arrangement normally maintains open the charg
extension I50 which rides- in a groove in pinion ing contacts I81, I89 hereinafter called E and
I04 so that the attraction of armature I49 moves
pinion I04 into engagement with initial timing
wheel I09. Restoring spring II6 normally holds
initial wheel I09 in its zero position with lug I53
'agailzst stop I54 (Fig. 20). Pinion I04 causes
the counter-clockwise rotation of initial wheel
I09 as viewed from the right in Fig. 18. Wheel
I09 being used for timing only the initial period,
normally maintains closed the ground contacts‘
I90, I89 hereinafter called F. Intermediate spring .35
I v89 carries angle piece I92 adapted to be moved
into the path of the toothed charging cam I93
driven by initial wheel I09 and into the path
of the toothed charging cam I94 driven by over
time wheel II3.
The stiff contact spring I95 is normally biased
is‘ adapted to make only one revolution. ' Just
against a stationary stop I96 and stiff contact
prior to the time that in the counter-clockwise spring I91 is normally biased against stud I85
movement of wheel I09,-lug I53 would again carried by the armature to bias the armature to
7 hit against stop I54,,the teeth “0 on pinion I04 its non-operated position. Hence the attraction 45
encounter a toothless portion I55 on the wheel of .armature I49 serves to close contacts I95, I91
periphery (Fig. 26) so that the driving pinion hereinafter called locking contacts G. Spring
is no longer effective. This toothless portion, I98 is not an electrical contact spring and its
' however, is bridged by teeth ‘I56 on a separate
purpose will be described later, but it may be
plate I51 attached to the wheel, teeth I58 being noted that spring I98 is normally biased against 50
’ displaced far enough from the main teeth on
wheel I09 that they are not engaged by pinion
I04 but are engaged by the gear I58 attached to
the speed governor I59 (Fig. 18). The initial
timing wheel I09, therefore, ceases rotation as
soon as pinion I04 reaches this toothless region
at. which time wheel I09 has completed substan
tially one revolution.
-
Just prior to the completion of the rotation of
initial wheel I09 the initial wheel sets into rota
tion the overtime‘ wheel H3 in the following
‘manner providing, of course, that the conversa
tion to be measured is still continuing. Initial
wheel I09 carries a lug I62 (Fig. 22) which just
prior to pinion I04 reaching toothless segment
- I55, contacts with a roller I63 carried by’an' arm
I64 hinged towframe I 01 by a spring member I65
which normally biases roller I63 towards wheel
I09 against a stop I66 which is an extension of
frame I01 (Figs. 21 and 22). An extension of
spring . member I85 carries an extension I61
‘which rides in groove‘ I68 in pinion I05.
The
free end of spring I65 is normally biased against
an angle piece I69'formed from arm I64. when
cam I62 comes into contact with roller I63 the
consequent movement of arm I64 serves to‘ bring
stop I86 carried by the armature. Contact spring
200 carries a stud 20I which passes through an
aperture in contact spring 203 and is pressed
against cam 202 mounted on initial wheel I09
so that the‘holding contacts H between springs 55
200, 203 will be closed as soon as cam 202 has
moved away from stud 20I. Stiff contact spring
I99 is also biased towards wheel I09 but is re
strained by spring projection 204 acting against
Contact spring 205 has a stud 206 60
which normally rests on cam 201 mounted on _
stud 20I.
wheel H3 and spring 205 has a second stud 208
which passes through apertures in springs I99,’
.200 to contact with a projection~209 on spring
203. It will also be apparent that as long as 65
cam 201 is opposite stud 206, and cam 202 is
opposite stud 20I, spring
spring I99 to maintain
contacts I. .
205 ispressed against '
closed the . off-normal
As previously stated, Fig. 30 shows the condi 70
tion of the electrical contacts with wheels I09
and H3 in their zero positions. The charging
contacts E are opened, the ground contacts F
closed, the locking contacts G opened, the hold
ing contacts H opened and the cit-normal con 75
6
2,112,875
tacts I closed. when the timing unit is seized
for the measurement of the duration of an estab
lished telephone connection the electromagnet I49
is energized to attract its armature I49 as shown
in Fig. 31. Armature I 49 when attracted closes
the locking contacts G due to the movement to
the left of stud I99 carried by the armature. Stud
I94, also carried by the armature, contacts with
projection H9 and serves to move the three con
10 tact springs I91, I99, I99 to the left to bring pro
jection I92 into the path of the toothed cams
I99, I94 while still preserving the ground con
tacts F closed and the charge b'dntacts E open.
and momentarily close the charging contacts E
three times since there are three teeth on cam.
I94. This means that for each complete revolu
tion of wheel H9 or fraction of a revolution the
calling station's message register will be oper
ated three times, it being assumed that such is
the appropriate charge for each overtime period.
As overtime wheel I I9 nears the completion of
a revolution as shown in Fig. 37 stud 299 is moved
to the rightby cam 291 to momentarily close the 10
off-normal contacts I and momentarily open the
holding contacts H, but as soon as cam 291 has
passed and the wheel II9 has started on its next
revolution the off-normal contacts I will again
The attraction of armature I49 also brings pin
ion I94 into engagement with initial wheel I99 "be opened and the holding contacts H again be
which starts rotating in the direction indicated closed until stud 299 again encounters cam 291.
by the arrow.
‘
.
Shortly after initial wheel I99 starts turning,
cam 292 rides oil’ stud 29I, allowing the biased
20 spring I99 to move to the right to open the on’
normal contacts I and close the holding contacts
H as shown in Fig. 32. Cam I99 which is mount
ed on disc I I9 and which, therefore, rotates with
wheel I99 now comes into contact with projec
25 tion I92 (Fig. 33) and hence moves spring I99
to the right once for each tooth 2| I on the rotat
ing cam I99. This movement serves to tempo
, rarily close the charging contacts E and term
porarily open the ground contacts F and in the
30 particular timing unit disclosed it will be seen
that the charging contacts will thus be closed
six times, it being assumed that for the particu—
lar call being measured the calling station's
When electromagnet I 49 is deenergized re
storing spring II9 will restore initial wheel I99
to its zero position with lug I94 against stop I99
and spring I34 will restore overtime‘wheel II9 20
to its zero position with lug I1I against spring
stop I12 as shown in Fig. 30. The retraction of
armature I49 withdraws pinion I94 and pulls
spring I99 out of .the path of cam 2I2 to allow
restoring spring ll9'to restore wheel I99, while 25
the restoring movement of wheel I99 causes cam
I92 to-ride of! roller I99 (Figs. 21. 23) and per
mits the spring pressed member I94 to disengage
pinion I 99 from wheel I I9.
In the preferred form of the invention, motor 30
2 of the local time unit assembly is continuously
operated while motor I9I for the zone timing
unit assembly is normally idle and operated only
‘message register should be operated six times as ‘
when one of its associated timing units is seized
35 the appropriate charge for the initial period.
but it will be apparent that both motors may be 35
Just prior to the time that pinion I94 reaches normally idle or normally rotating if desired.
the toothless segment on wheel I99 cam 2 I2 comes
into contact with spring I99 and spring I99 is
pressed to the right by the front sloping edge
40 of cam 2I2. The arrangement is such that at the
moment pinion I94 reaches toothless segment
I99 of wheel I99 cam 2I2 has caused the maxi
mum movement to the right of spring I99 and
the spring is starting to ride down the rear slop
45 ing edge 2I9 of the cam. The pressure of spring
I99 on cam- 2I2 is sumcient to move wheel I99
slightly forward as spring I99 slides down slope
2I9 to positively separate the teeth on pinion
I94 from the'last tooth on wheel I99. That is,
50 spring I99 serves to keep wheel I99 in the posi
tion shown in Fig. 26. Fig. 34 shows wheel I99 in
its maximum advanced position where it will re
main until the magnet I49 is deenergized. Just
prior to pinion I 94 reaching toothless segment
55 I99 earn 292 again contacts with stud Hi to
A suitable speed governor is provided for con
trolling the‘retum speed of each gear wheel.
Governor I99 which engages initial wheel I“
has already been referred to while a similar gov
ernor 229 is provided for overtime wheel II9.
In the particular example of zone timing unit
chosen for illustration it has been assumed that
the initial period was five minutes for which the
message register would be operated six times, and
that the duration of each overtime period was
three minutes, for which the message register'
would be operated three times. It will be noted
mm Fig. 17 that gear I19 on pinion I99 is larger
than gear II9 on pinion I94 and that overtime 50
wheel I I9 is smaller than initial wheel I99,
the relation being such that initial wheel I99
makes a complete revolution in ?ve ‘minutes while
overtime wheel II9 makes a complete revolution
in three minutes.
55
close the off-normal contacts I and open the
- Fig. 29 graphically represents the condition of
holding contacts H as shown in Fig. 34. Also just - the various contactsiduring the initial and ?rst
prior to the completion of the movement of wheel overtime period for the zone timing unit. Line
I99 lug I92 on wheel I 99 (Figs. 20, 22) comes into 22I shows that the locking contacts G are closed
contact with roller‘ I99 to cause' projection I91 at the instant the armature I49 is attracted at
to move pinion I99 into engagement with over
time wheel II9. as previously described.‘ Fig. 34,
therefore. shows the overtime wheel II9 about
to begin its movement. =
65
As the rotation of wheel II9 begins (Fig. 35)
cam 291 moves. of! stud 299 to open the oi!
V14:
nornml contacts I and close the holding con
tacts H in a manner previously described. ‘Since
electromagnet I49 is still energized, projection
I92 is’ still in the path of the toothed cam I94
which "as shown in Fig. 23, is a portion of mem
ber I99’ and hence rotatable with wheel I I9. After
wheel ‘II9 has moved an appreciable distance
the toothed cam I94 (Fig. 36) serves to momen
tarily open the ground contacts 1"
times
the beginning of the initial period and that the
locking contacts are not broken in going from the
initial period to the overtime period. Line 229
shows that the holding contacts E are closed
shortly after initial wheel I99 starts rotating. are 65
opened shortly before wheel I99 stops rotating
and are closed again'shortly after overtime wheel
II9 starts rotating. Line 224 shows that the oi!
normal contacts I are opened shortly after the
initial wheel I99 starts rotating, are closed 70
shortly before wheel I99 ceases rotating and are
opened again shortiy=after overtime wheel “9
starts rotating. Line 222 shows that the ground
contacts F are closed except when the charging
contacts E are operated. Line 229 shows that the 79
2,112,375
"
V
7
charging contacts E are operated shortlyafter
closed contacts A, conductor 280, left inner front
completes a revolution once every three minutes
and that gears I09 and H0 are so designed that
its false operation as long. as the ground con
tacts D are closed. When wheel II has opened
the holding and oif-normal contacts have been contact'relay 234, conductor 242, front contact
district trunk relay 238 to ground.
operated, to operate six times the message regis
With relay 234 energized the normally closed
ter associated therewith, and that shortly after ground contacts D are connected. through con
the beginning of ‘each overtime period the charg-v ductor 243, left outer front contact relay 234,
ing contacts vare closed three times.
conductor 244 over the lowest contacts of the
In the disclosed zone timer it has been assumed primary and secondary line switch cross-points,
that gears I10 and H3 are so designed with re
winding message register relay 245, thereby
spect to the speed of shaft I02, that wheel H3 short-circuiting the message register to prevent
the revolution of wheel I09 takes ?ve 'minutes.
These gear combinations, however, may be read
ily altered to give any desired initial period or
15 overtime period for other zone timing mech
anisms which may be required to charge for
calls to the various zones to which the calling
subscriber’s line may be extended. It is also
obvious that other zone timing mechanisms may
20 have any desired number of teeth on the initial
period charging segment I93 and the overtime
ground contacts D and momentarily closed
charging contacts C, it will beobvious that the
message register relay 245 will be operated.
Whenever the calling subscriber places his re
ceiver back on the switch-hook, relay 238 re
leases, in turn releasing relay 234 which opens
the operating and holding circuits for relay mag
net 42. The gear wheel II will thereupon be re
stored to normal by its restoring spring as pre
viously described.
charging segment I94.
‘ .
Fig. 38 is intended to illustrate certain of the
circuits and circuit connections involved in a
25 cross-bar machine switching system in the selec
'
20
>
Itwill' now be assumed that the call initiated by
the calling station 230 is to a station served by
an exchange located outside the local area.
tion of the proper timing unit for timing apar
ticular telephone connection. The complete cir
cuits are not disclosed but are shown in greater
detail in the above-mentioned Scudder applica
tion.
It will ?rst be assumed that the dialed call is
between exchanges within the local area. The
calling subscriber’s station 230 will be connected
through the primary and ‘secondary switches of
the line switch through a district trunk and the
district primary and secondary switches to the
called subscriber’s station 23I. The district
trunk relay 238. will be energized in the usual
manner. The dialed information sent to the de
40 coder marker 232 causes it to connect ground to
conductor 235 thereby energizing relay 234 pro
- viding the local timing unit associated with the
selected district trunk is in its normal position
with its off-normal contacts B closed. The ener
gization of relay 234 takes place over a circuit
from battery, winding of relay 234, conductor
260, closed contacts B, conductor 235, to ground
236. Relay 234, therefore, pulls up its contacts
and is locked up over a circuit from battery,
winding 234, left inner front contact relay 234,
- conductor 242, contact relay 238 to ground.
When the called party answers, the called
station supervisory relay 231 is energized and
after a certain delay indicated by the dotted
character of conductor 240 a circuit is established
for starting the operation of the local timing
unit associated with the particular district trunk
circuit employed in. establishing the connection.
This circuit may be traced from battery, wind
60
10
ing- relay magnet 42, conductors 239, 2“, left
middle front contact relay 234, conductor 24d,
and front contact relay 231 to ground. Magnet
42 pulls the‘ pinion 1- into engagement with gear
wheel I I' and the local timing unit begins to func
The 25
connections between the calling subscriber’s dis
trict trunk and the decoder marker are estab
lished in the manner described in the above-men-r
tioned Scudder application. The marker 232
knowing the o?ice code information transmitted 30
to it by the sender (not shown) operates one of
its zone relays such as relay 246, the particular
zone relay operating being dependent upon the
zone in which the called station exchange is lo—
cated.
It will be assumed that shaft I02 is adapt
ed to operate only one at a time the several zone
timing units associated therewith, each timing
unit being adapted to serve for a different zone,
it further being assumed that there are a num
ber of such shafts H12 available for selection, 40
each shaft controlling its respective zone timing
units. The decoder marker acting under the
dialed oflice code designation supplied to it con
trols apparatus (disclosed in the Scudder appli
cation) which tests for a zone timing unit as
45
sembly which has all of its timing units idle as
indicated by the fact that all of the off-normal
contacts of its timing units are closed. It will
be noted that conductor. 241 is connected to bat
tery through the closed off-normal contacts of all 50
of the timing units associated with the disclosed
zone assembly. Consequently when a test relay
(not shown) is operated when connected to con
ductor 247 it is indicated that the particular zone
assembly under test is idle and hence available
for timing the call. The marker, therefore, con
nects ground to that relay magnet of the zone
assembly which is associated with a timing unit
having the proper charging rate for the called
zone. Thus, it may be assumed that the timing
unit associated with relay magnet I48 is the
desired unit and vhence the marker connects
ground to conductor 248 leading to winding relay
548, battery and ground, causing relay I48 to
operate.
In the meantime the district trunk re
' tion to measure the duration of the connection. " lay 238 has operated but the marker does not
between stations 230 and 23L Motor 2 which
drives pinion 1 is constantly operating as shown
in the ?gure.
Gear wheel II in rotatmg will first open the‘
off-normal contacts B and close the holding con
tacts A and shortly thereafter will open ground
contacts D andamomentarily close charging con
Contacts A in closing establish a holding
circuit for relay magnet 42 which may be traced
75 from battery, winding relay 42, conductor 239,
operate its local relay 249 and hence for a zone
call relay 234 is left unoperated. Also under con
trol of .the marker the cross-bar switch mecha
nism 258 is operated to connect conductors 25I, 70
252 and 253 to the selected idle zone assembly as
will now be described.
Relay magnet I48 when operated serves to en
gage pinion I 04 with the initial wheel I 09 but
shaft I02 is normally idle. Relay magnet I48 in 75
8
2,112,375
operating locks up over a circuit from battery,
winding relay I48, locking contacts G, conductors
255, 256, switch 250 and conductor 25I to ground.
As soon as the called party 23I answers, the called
10
said driving member, a stationary shoulder nor
mally engaging one end of said spring, the other
end of said spring rotating with the rotation of
said driven member tending to wind up said
station supervisory relay 231 is operated and
starts the motor IIII by closing the following cir
cuit from battery, motor IIlI, conductor 2,54,
switch 250, conductor 253, left middle back con
tact relay 234, conductor 24!! and front contact
said shoulder to cause said released end to make
a revolution before coming again to rest against
relay'23'l to ground. Motor IIII, therefore, starts
said shoulder.
spring as said driven member rotates, a cam
member driven by said driven member for
periodically releasing said ?rst spring end from
rotating shaft I02 and hence the initial wheel I09 '
2. A timing device comprising a driving mem
starts rotating to measure the initial time inter
ber, a rotatable driven member normallydisen
val. The movement of wheel I09 first opens the
off-normal contacts I so that no other trunk cir
cuit may seize a timing unit driven byv motor I0 I ,
and also closes the holding contacts H to estab
lish a holding circuit for motor IIII from battery,
motor IllI, conductors 254, 251, closed contacts
H, conductor 256, switch 250 and conductor 25I
20
to ground.
_
,
It will also be noted that switch 250 serves to
connect the ground contacts F to the message
register 245 over a circuit which may be traced
from ground, closed contacts F, conductor 258,
25 switch 250, conductor 252, left outer back con
tact relay 234, and the primary and secondary
line switches to the winding of the message reg
ister relay 245. The continued movement of
wheel I09 and cam I93 will open ground contacts
F and close the charging contacts E to connect
battery to the message register. relay a number
of times, depending upon the number of ‘teeth on
cam I 93. After wheel I09 has made substantially
a complete revolution corresponding to the end
of the initial period, wheel I09 causes overtime
wheel I I3 and cam I94 to start rotating for meas
uring the overtime interval. Wheel H3 will also
operate the charging contacts E a number of
times depending upon the number of teeth on
40
cam I94 as previously described, thereby operat
ing the message register 245 in accordance with
the proper charges for eachovertime interval.
When the calling party 230 hangs up, there
lease of relay 239 serves to open the energizing
circuits for motor IIII and relay magnet I48
whereupon the timing wheels I09 and H3 restore
gaged from said driving member, an electromag
net having an armature which when attracted
controls the engagement of one of said members 15
with the other of said members, electrical con
tacts operated by the advance of said driven mem
ber from its normal position, a tensioned helical
spring for restoring said driven member to its
normal position after disengagement from said 20
driving member, a stationary cylindrical surface
on which one end of said spring rests, the other
end of said spring rotating with said driven mem
ber, a stationary shoulder acting as a stop for
said ?rst end to hold said spring under tension, 25
a cam member driven by said driven member
for periodically releasing said ?rst spring end
from said shoulder to permit said first end to
complete a revolution about said cylinder before
again coming to rest against said shoulder.
3. A timing device comprising a driving mem
80
ber, a rotatable driven member normally disen
gaged from said driving member, an electromag
net having an armature which when attracted
controls the engagement of one of said mem~
bers with the other‘of said members, electrical
contacts operated'by the advance of said driven
member from its normal position, a tensioned
helical spring for restoring said driven member
to its normal position after disengagement from
said driving member, a stationary cylindrical sur
face on which one end of said spring rests, the
other end of said spring rotating with said driven
member, a stationary shoulder acting as a stop
for said ?rst end to hold said spring under ten- ,,
sion, a rotatable cam member for periodically re
to their normal positions under the action of their - leasing said spring end from said shoulder to per
restoring springs and are, therefore, ready to be mit said one end to complete a revolution about
selected for another call.
said cylinder before again coming to rest against
For convenience in simplifying the schematic said shoulder, means rotatable with said wheel for
showing of the zone timing unit of Fig. 38 one set rotating said cam, said means being disengaged 50
of ground and charging contacts have been shown
for the initial wheel and another set of ground
and charging contacts have been shown for the
55 overtime wheel, but it is to be understood as de
scribed in connection with the earlier ?gures that
the preferred arrangement is such that the initial
and overtime wheels actuate the same set of
charging and ground contacts. For purposes of
60 simpli?cation there is also omitted from Fig. 38
the manner in which the overtime wheel I I3 con
trols the holding contacts H and o?-normal con
tacts I as explained in connection with‘Figs. 30
to 37.
-
‘
What is claimed is:
1. A timing device comprising a driving mem
ber, a rotatable driven member normally disen
gaged from said driving member, an electromag
net having an armature which when attracted
70 controls the engagement of one of said members
with the other of said members, electrical con
tacts operated by the advance of‘said driven
member from its normal position, .a tensioned
helical spring for restoring said driven member to‘
75 its normal position after disengagement from
from said cam when said driven member is in its
normal position.
4. A timing device comprising a driving mem
ber, a rotatable driven member normally disen 55
gaged from said driving member, an electromag
net having an armature which when, attracted
controls the engagement of one of said members
with the other of said members, electrical con
tacts operated by the advance of said driven 60
member from its normal position, a tensioned
helical spring for restoring said driven member
to its normal position after disengagement from
said driving member, a stationary cylindrical
surface on which one end of said spring rests, 65
the other end of said spring rotating with said
driven member, a stationary shoulder acting as a
stop for said ?rst end to hold said spring under
tension. a rotatable cam member for periodically
releasing said spring end from said shoulder 70
to permit said one end to complete a revolution
about said cylinder before again coming to rest
against said shoulder, means rotatable with said
wheel for rotating said cam, said cam member
having an elongated arcuate slot for guiding the
9
9,119,875
released end of said spring back again to said
shoulder, said slot when said driven member is in
its ‘normal position preventing said ?rst spring
end from beingreleased from said shoulder;
rotation oi’ said second driven member after said
?rst driven member has reached a de?nite ad
vanced position, and means controlled by said
second driven member for controlling said con~
5. A timing device comprising a driving mem
ber, a gear wheel mounted for rotation about a
fixed axis, an electromagnet for causing the en
tacts.
gagement of said wheel and said member, elec=
' trical contacts actuated by the advance of said
10 wheel from its normal position, a spring stop for
determining the normal position of said wheel,
means rotatable with said wheel normally en
'
8. A timing device for measuring the duration '
of a telephone connection comprising a rotatable
shaft, slidable pinions on said shaft, a rotatable
wheel, electromagnetic means for ‘moving one oi
said pinions into engagement with said wheel, a
second rotatable wheel, cam means rotatable with
said ?rst wheel-for actuating a second of said
gaging said stop, a tensioned helical spring for ,, pinions to move said second pinion into engage
restoring said wheel to its normal position against ment with said second wheel when said ?rst wheel
15 said stop after the disengagement oi‘ said driving has reached a definite advanced position, elec 15
member and said wheel, a stationary cylindrical trical contacts controlled by said wheels and
surface aligned with said axis and on which one
end of said spring rests, the other end oi’ said
spring being rotatable with said wheel, a sleeve
20 mounted on said wheel for supporting a plurality
oi’ the turns of said spring, a stationary shoulder
, normally engaged by said ?rst spring end to hold
_} raid spring under‘tension, a cam member rotst=
25
able about said axis, said cam member having
spaced shoulders, a projection rotatable
said
wheel and located between said spaced- shoulders,
said projection driving said cam member after
said wheel has been moved a substantial distance
from its normal position, said cam member after
making
on said ?rst
a substantially
spring end complete
to releaserevolution
said first spring
end from said shoulder to permit said
spring
again
end tocome
rotate
to around
rest against
said cylindrical
said shoulder,
surlace
said cam
member having an elongated arcnate slot nor—
mally preventing the release oi’ said first spring
end from said shoulder.
6. A timing device-for measuring the duration
of a telephone conversation for which the sub
scriber is charged at a certain rate for a given
initial period or any fraction thereof and is
charged at a certain rate for an overtime period,
said device comprising a driving member, a rotat~
able driven,memberfelectromagnetlc means for
moving one of said members into engagement
with the other of said members to cause salt
driven member to be rotated through a de?nite
angle but not beyond said angle, electrical con
tacts for controlling a subscriber’s charging cirn
cult, said contacts being actuatedby said driven
member when advanced from its normal position,
means for restoring each or’ said wheels to a defi
nite normal position when said electromagnetic
means has disengaged said first wheel from said
first pinion"
20
A timing device for measuring the duration
or? a telephone connection comprising a rotatable
slidable pinions on said shalt, a rotatable
toothed gear wheel, electromagnetic means ~for
moving one oi said pinions into engagement with 25
wheel, said wheel having a toothless seg
ment to render said pinion ine?’ective alter said
wheel has been advanced to a de?nite no time, a
second gear wheel, means controlled by the ad
oi said ?rst wheel for causing a second
pinion to engage said second wheel, electrical con
controlled by said wheels and means for re
storing each oi said wheels to a de?nite normal
position when said electromagnetic means has
disengaged said first pinion from said ?rst wheel. 35
ii).
device for measuring the duration
on? a telephoneiconversation comprising n rotat
able shalt, gears driven by said shaft, a rotatable
driven: member comprising a gear wheel, electro
magnetic means for engaging said wheel with
said wheel has been advanced to a de?nite posi- '
tion, spring means for preventing contact between
the teeth on said wheel and the teeth on said 45
?rst gear when said ?rst gear reaches said tooth
less segment, a second rotatable driven member
comprising a second gear wheel, means controlled
by said ?rst member for engaging said second '
wheel with a second of said gears when said ?rst 50
member has reached a de?nite advanced position,
electrical contacts controlled by said members
a second rotatable driven member, means under
the control of said ?rst driven member for rotate
and means for restoring each of said gear wheels
ing said second driven member, after said ?rst
to a de?nite normal position when said electro
magnetic means hcs disengaged said ?rst gear
-55 driven member has advanced to a de?nite posi
‘tion, said second driven member during its rota
tion also actuating said contacts.
7-. A timing device for measuring the duration
01' a telephone connection for which the sub
40
one of said gears, said wheel having a toothless
segment to render
?rst gear ineffective after
from said ?rst wheel.
-
ll; A timing device for measuring the duration
or a telephone conversation for which a sub;
scriber is charged at a certain rate for a given '
initial period, .11‘ any fraction thereof and is
“initial period ‘or any fraction thereof and is charged at a certain rate for an overtime period,
charged at a di?erent rate for an overtime period, , said device comprising a drivingmember, a rotat
able driven member for measuring said initial
said device comprising a driving member,.a rotat
able driven member, electromagnetic means for ' period, a. rotatable driven member tor measuring
moving said members into engagement with each said overtime period. electromagnetic means 101‘ 65
60 scriber is charged at a certain rate for a given
other to cause said driven member tqbe rotated
through a de?nite angle but not beyond that
angle; electrical contacts for controlling a sub
scriber’s charging circuit and actuated .by the
70
advance of said driven member, a second driven
member, means driven by said driving member
and adapted to engage said second driven member
engaging said driving member and said initial
member, means for disengaging said driving mem
and said initial member after said initial
member has rotated for a time “interval substan
tially equal to said initial period, means con 70
trolled by said initial member ande?ective only
after said initial member has advanced sum
for rotating-the same but normally disengaged . ciently to substantially complete the measure—
- therefrom, cam means rotatable with- said driven ment of said initial period‘ tor ensa?ne said‘
,76 member for actuatmc said means to
driving member and said overtime member, said 75
10
8,112,875
initial member and said overtime member each
being biased to a deiinite normal position, electrical contacts for controlling a subscriber's
charging circuit and actuated both by said initial
member and said overtime member when said
ing member from their normal positions, and
means eii'ective alter the disensagement 0! said
driving member and initial member for holding
said initial member in its advanced position dur
ing the time interval said driving member is in 5
initial member and said overtime member are
advanced a predetermined amount by said drlv-
engagement with said overtime member.
EDWARD D. MEAD.
d
i
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