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Патент USA US2408107

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Sept. 24, 1946.» .
»
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"F, A. sTEARN
DROP SIGNAL WITH VIBRATION LOCK
Filed »hay 26, 1944
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2,408,106
2,408,106
Patented Sept. 24, 1946
UNITED STATES PATENT OFFICE
DROP SIGNAL lWITH VIBRATION LOCK
Franklin A. Stearn, Westfield, N. .1.,4assîgnor to
Federal Telephone & Radio Corporation
» Application May-26, 1944, Serial No. 537,518
ï
eolaims. (o1. 177-329)
2
i. as herein disclosed the features thereof are shown
incorporated in an improved combined magnet
drop signal device of the type customarily em
controlled drop and jack construction wherein
ployed in conjunction with manually operated
the latch or drop retaining hook, as customarily
switchboards of telephone systems. It comprises
employed is moved by an armature fulcrumed
an improved design and structural arrangement
iorwardlyvof the magnet structure with the lat
including a special provision operating to pre
ter providing a double pole piece arrangement
vent non-impulse releasing of the signal drop
coacting uniedirectionally with the armature on
due to Vibration. Asa result it eliminates danger
the opposite sides of its fulcrum. In the struc
of and the annoyance of rimpropersignalling to
the operator.
'
V10 ture as shown a indicates the usual magnet sup
porting frame of open sided channel formation
The improved features _of the invention lare de
having they upper and lower ywalls I and 2, a Ver
sirably incorporated in a combined magnet con
tical side wall 3 and inturned walls 5 and 6.
trolled drop and restoring jack arrangement
Within the rearward portion of the frame there
wherein the signal drop is restored to its rnon
is supported the usual magnet coil 'I provided
busy line position by the insertion of the usual
line plug connection in- theJ usua1 arrangementV with the central core 8 and having the rearwardly
extended connectors 9 for the signal circuit leads.
wherein the plug restores the drop, completes the
The magnet is supported by the insulating wash
line extension circuit and disconnects the magnet
This invention relates to improvements in a
ers I0 and I! and as shown the core is forwardlyY
or signal circuit as it is moved into position.
As
is well known, in the equipment of this type as
customarily employed and particularly after an
extended period of use the delicate adjustment
extended to provide the pole piece I2 in suitable
forwardly extended relation to the magnet.
The _
frame'has a portion of its upper wallsevered and
downwardly deflected to provide a lip llange and
forward pole piece I4. This pole piece I4 pro
of the latch, as a result of Wear and resulting
changes in alignment, tends to become insecure
in the holding arrangements of the drops with
the result that certain of the drops may release
vides a support for a ilat body, bearing Ypiece I6 ~
assembled therewith from the open side of the
frame and resiliently securing the bearing piece
in response to vibration as a result ofwhichim
proper signals are conveyed. In accordance with
in position while allowing horizontal adjustment .
thereof. The bearing ,piece I5 at its rearward
the present invention this objectionable factor is
overcome by the provision ofa supplemental lock 30 portion is formed with downturned ears I'I aper
tured to receive a bearing pin IG. The pin I8 is
ing means having a retaining ringer engagement
positioned intermediate of the pole pieces I2 and
with the latch hook in a manner to prevent Vibra
I4 and the armature b is fulcrumed thereon to
tion from raising the hook to such elevation that
extend forwardly and rearwardly for coaction
the shutter will be released. >It is further ar
ranged that the locking feature or detent shall be 35 with the pole pieces I4 and I2 to have normal,
de-energized air gap relation. The armature has
Linder the control of and released by the signal
integrally formed Ytherewith the foIfWard latch
ling current for which purpose it is provided with
or hook extension 20, which in the standard ar
a supplemental armature to be moved thereby
rangement projects forwardly through an open
into non-locking position responsive to energizing
40 ing in the frame and in the supporting panel 2|
of the magnet coil of the signal circuit.
and is formed with the detent 22 for retaining
The described and other features and advan
engagement with the usual hinged drop shutter
tages of the present improvements will be more
24. As will be noted the armature arrangement
fully understood by reference to the accompany
provides a double air gap at opposite sides of its
ing drawing wherein like reference characters
are applied to the corresponding parts in the sev 45 fulcrum for imparting a uni-directional rotative
eral views;
I
In the drawing:
Y* .
,
Y
force or magnetic attraction.
.
cien'cy, the features thereof being more fully eX
plained in a, copending application Serial Num
Fig. 1 is a View in side elevation showing the
parts in signal position with the magnet ener
gized.
'
i
Fig. 2 is a similarview showing the parts in the
restored position with the magnet de-energized.
Fig. 3 is a Vertical sectional View taken on line
There results an
improved modevof operation having high eili
.
50
ber 537,510, filed May 26, 1944.
.
l
Y
Y
With the described magnet and armature con
trolled latching arrangement rthere is employed
Ythe customary hinged shutter 24 pivotally
mounted at 25 upon a bearing pin carried `by the
I
In the preferred embodiment of the invention 55 mounting plate 26 attached to the panel 2| by
3-3 of Fig. 1.
2,408,106
3
4
screws likewise retaining the frame unit in posi
tion. The shutter is formed with the usual open
ing to receive the latching detent 22 with the
lower Iwall of the opening formed in the usual
manner for cooperative latehing engagement.
To the underside of the frame member I there is
gizing of the magnet and to lock the shutter
when the magnet is cie-energized and supplemen
tal locking means operative normally to lock the
movable armature and to elîect release thereof
responsive to energizing of the magnet.
2. A drop signal comprising a pivotally sup
attached the jack assembly c. as customarily
ported drop shutter, a magnet, a movable arma
ture latch element coacting with the shutter to
employed, composed of the horizontally extending
release the shutter on energizing of the magnet
extension contacts 29-29' and the usual drop re 10 and to retain the shutter when the magnet is de
energized, a supplemental armature operatively
storing spring 3i forwardly extended to engage
associated with the magnet and a locking ele
with the shutter as shown. The restoring spring
ment normally engaging the armature latch ele
is engaged by an insulating button 30 on the
ment and connected to the supplemental arma
upper extension line contact 29 to be elevated
for closing of the shutter upon insertion of the 15 ture to 'be moved thereby for release of the ar
mature latch element on energizing of the mag
line extension plug in the manner well known.
net.
The referred to contacts and restoring spring are
3. A drop signal comprising a pivotally sup
as shown supported by insulating plates and the
jack assembly is secured to the frame I by means
ported drop shutter, a magnet, a movable arma
20 ture latch element coacting with the shutter and
of the inverted U bolt 32.
operative to release the shutter on energizing of
In accordance with the present invention there
the magnet and to retain the shutter when the
is associated with the foregoing structure, which
magnet is (ie-energized, a movably supported
in its general mode of operation conforms to
locking element normally engaging the arma
standard construction, a special and cooperating
locking detent arrangement operating in an im 25 ture latch element to prevent release movement
thereof and a supplemental armature carried by
proved manner to prevent the release of the shut
the locking element and associated with the mag
ter responsive to vibrations and otherwise than
net whereby on energizing of the magnet said sup
by proper signal current reception. To this end
plemental armature will retract the locking ele
the armature latch element 20 is formed on its
under side with a shoulder portion 34 having its 30 ment for release of the armature latch element.
4. A drop signal comprising a pivotally sup
rear face formed with a horizontal cross slot or
spring contacts of the signal circuit 28-28', line
recess 35 for the reception of a ñat metal detent
ported drop shutter, a magnet, a movable arma
or locking piece 36 secured to a supplemental ar
ture latch element coacting with the shutter to
mature 38 vertically positioned in alignment with
release the shutter on energizing of the magnet
and in normal close spaced relation to the central 35 and to retain the shutter when the magnet is de
pole piece I2.
This supplemental armature is
energized, said latch element being provided with
a recessed shoulder, a supplemental armature op
mounted upon a flat spring metal support 39 se
eratively associated with the magnet and. a lock
cured to the lower wall 2 of the frame. In its
ing element normally engaging the armature
structural arrangement the detent piece 36 and
the resilient support 39 may be formed integrally 40 latch within the recess and connected to the
supplemental armature to be Withdrawn from the
of angular formation and secured within a groove
recess for release of the armature latch element
-in the armature 38 by being welded thereto.
on energizing of the magnet.
The relative position of the detent 36 and the
5.`A drop signal comprising a pivotally sup
recess 35 is such that they will register and the
detent end portion will be received within the 45 ported drop shutter, a magnet having a forwardly
extending pole pivoted to be movable relative to
a side face of the pole piece and. an armature
retaining position. It will when in this position,
latch element operatively coacting with the shut
as shown in Fig. 2 and with the magnet de-ener
gized, retain the hook yfrom elevating responsive
ter to release the shutter on energizing of the
magnet and to retain the shutter when the mag
to vibration. Upon energizing of the magnet re
net is de-energized and a supplemental armature
sponsive to line signal, the supplemental armature
movable relative to the end rof the pole pieces and
38 will be attracted to pole piece I2 thereby to
locking means connected therewith to operate
withdraw the detent from the recess 35 and to
normally to lock the movalble armature and to
permit release of the drop as will be readily un
effect release thereof responsive to magnet ener
The proportioning of the spring ,
derstood.
gizing.
mounting 39 for the armature 38 is such as to
6. A drop signal comprising a pivotally sup
permit this releasing operation to occur by its
ported drop shutter, a magnet, a movable arma
yielding responsive to the pull of the magnet as
ture latch element pivotally supported for
is shown in Fig. l.
The improved arrangement as thus provided, 60 wardly of the magnet and coacting with the shut
ter to be operative to release the shutter on ener
is simple vand effective in insuring against im
gizing of the magnet and to retain the shutter
proper release of the drops such as may be caused
when the magnet is de-energized, said armature
by vibration of the housing or accidental brush
ing against the panel face. Its arrangement,
latch element being formed with a depending
whereby it is electro-responsive in its releasing to 65 shoulder having a rearwardly open recess, a re
siliently supported locking element normally en
the signal ilmpulse further provides for its re
lated operation in a manner to avoid maintenance
gaging the armature latch element within the re
adjustments as might otherwise be required for
cess to prevent release movement thereof and a
correct operation.
supplemental armature carried by the locking ele
What is claimed is:
70 ment and associated with the magnet end where
1. A drop signal comprising a pivotally sup
by on energizing of the magnet said armature will
ported drop shutter, a magnet, a movable arma
retract the locking element from the recess for
ture latch element operatively coacting with the
release of the armature latch element.
shutter to effect release of the shutter on ener
FRANKLIN A. STEARN.
recess when the hook or latch is in its lowered or
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