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Патент USA US2406378

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Àug. 27,- 1946.
Filed Mároh 25, 1944
2 sheets-sheet l
Patented Aug. 27, 1946 `
1'italph B. Immel, Wilkinsburg, Pa., assignor to'
VJesting-house Electric Corporation, East Pitts
burgh, Pa., a corporation of `Pennsylvania
Application March 25, 1944, serial No. 52,8;060' -
5 cmims. (ci. >74--527l>
My invention relates to shock-responsive latch
ing devices for preventing failure or faulty oper
ical oscillators may'v have different natural fre
quencies and/ or different damping.
According to a preferred embodiment-of my in
vention, I provide a device of tlïie type> just men;
tioned with a number of independently movable
It has been proposed and undertaken to prevent
weights of substantially equal mass and dimen
electric relays and switches from uncontrolled op
sions and attach thereto‘a corresponding number
erations when exposed to shock or vibrations by
of springs of' different elastici-tyV or stiffness so
providing them with a latching device which, us
that the oscillators have different natural fre
ually inoperative, is placed- into latching condition
by means of a mechanical vibratory system that 10 quencies because of the 'different springs',
ation of apparatus, especially electric contac/tors,
under impact or shock conditions.
responds more readily to shock than the appara
tus to be protected and locks the apparatus in
position as long as the shock of its vibratory ef
According to still another feature of the in
vention, the plurality» of weightsare'all movably
mounted for reducing motion about a common
fect persists.
A general object oi' my invention is to improve
latching devices and shockproof apparatus of the
parallel to one another,l and eachappertaining
type just mentioned so as to increase their’range
of response and render their adjustment less ex
acting than in the known devices.
pivot axis so that their planesof motion are in
spring is a substantially straight rod or strand
shaped body located substantially in _parallel to
the other springs» and of ' similar over-all length
so that the fasteningpointsof the'y springs lie on
The vibratory system in thel known shock-re 20 a line in parallel to the justîmentioned pivot' axis
more speciiicall‘y‘ these springs are fastened to a
sponsive latching devices, usually composed of a
portion of the latching lever located near the
movable Weight and a spring, is ratherrcritical as
fulcrum of the lever.
' to the adjustment necessary for covering a satis
These objects and featuresA will be fully under
factory range of low and high impact forces. It
may occur that a device which works satisfactor 25 stood from the following description of the em
bodiments illustrated in thel drawings. n
ily on low impact forces responds toa lesser de
Figure 1 is a top view of a contactor provided
gree on ‘nigh impact blows and vice versa, such a
with a shock responsive >latching` device according
device may also be exposed to impacts of a fre
quency too different from the natural frequency
to myfinvention;
Fig. 2 is a part-sectional side'el'evation of the
of the weight and spring combination to be'suf
same contacter;
ûciently within the range covered'by the damped
Fig. 3 is another part-sectional side elevation
resonance characteristic of the latching device.
seen from the same viewpoint as_jFig'.` 2, the sec
Hence, it is a more speciiic object of the inven
tional parts of Fig. 3 being’in thevplane denoted
tion to provide a latc‘ning device that responds
more safely to shock frequencies of widely differ ab in by the dot-and-dash line III-III in Fig. 1.
Fig. 4 shows a sectional` view of the latching
ent magnitudes.
device separate' from> the, contactor` with the
Another object of my invention is to provide a
latching lever ininoperative'position.
y y
shock responsive locking or latching device, in
Fig. 5 is an illustration similar to that of Fig. 4
accordance with the foregoing object, that lends
itselic readily for application with different types 40 but' showing the latching device >in operativecon
of electrical apparatus and can be manufactured
or tested as a separate latching unit.
In order to achieve these objects, a shock-re
sponsive latching device according to the inven
Fig. 6 is a‘bottom Viewy ofîïthe'lat‘ching, device '
according to Figs. 4 and 5;
Fig. 7 is a part-sectional and perspective View
tion has a support or frame structure separably
attached to the apparatus to be latched and serv
ing as a holder for a normally inoperative latch
of the same device;` v'
as well as for a plurality of mechanical oscilla
Fig. 9 is a perspective 'View'l of,- one of the 'me
chanical oscillating systems of the deviceaccord
tory systems of difi’erent oscillation characteris
tics which are arranged to operate and control 50
the latch independently of one another so that
y '
Fig. 8 _representszafront View of a different
embodiment of the latching device; and
ing to Fig. 8.
Referring to Figs. l, 2, and’3‘,l the illustrated-
contactor has a magnetic frame structure l which
any of the systems is capable of moving the> latch
carries a magnet core 2 and a coil 3' placed around
into latching or locking position when respond
ing to shock. In order to obtain the desired dif
the core. An abutmentK4 member 4 is mounted on
ference in oscillation characteristics, the mechan 55 the magnetic structurel and hasra‘bracket'por#
tion 5 which extends towards the area in front
of thefmagnet core.
presses against the latching lever 23 so as to hold
The abutment member 4
it in its inoperative position illustrated in F1gs. l,
. 3 and the adjacent end of the structure I form a
‘ corner at 6 which serves as a dihedral pivot
. bearing for the armature 1.
3, and 4. The lever 23 has an opening at 25 for
engagement with the latch 20 ofthe armature 1 '
(Fig. '3) when the armature is in contact closing
position. A third pin 3i) also secured between
The armature is
i beveled so as to form a knife-type edge which
î engages the’pivot bearing. A weight 8 is'ñrmly
the two legs of the U-shaped structure 2l serves -
i secured to thearmature 1, and so is a bracket
as a pivot for four weights denoted by 3l, 32,
§ 9 which forms an abutment'for a coiled compres
33' and 34. TheV pins 23, 21 and 35 are prefer
sion spring whose'other end is braced against an ll) ably riveted to the support 2I at one or both of
` abutment formed by the portion 5 of the member
their ends.
ï 4. A latch member 20 is also rigidly secured to I
; the armature for a purpose to be described here- ;
. Two contact members I I are mounted on an in- '
I sulating carrier I I' secured to the armature 1 and.y , Y
are each connected by a flexible cable I2 with ì
`Each of the weights 3|, 32, 33 and 34 is capable
of oscillation independent of the other weights
and has two projections such as those denoted
by 5I, 52 which face the lever 23 and serve to
move the lever into latching position against the
force of spring 28. Four wire springs 4I, 42, 43
. two terminals I3 respectively.
Each contact II
and'44 are at one end ñrmly secured to the
l cooperates` with one oftwo stationary contacts
weights 3l, 32, 33, andV 34, respectively. The
1 VIllwhich are provided with respective terminals 20 other ends of the springs pass through' an open
‘ I5. Blowout coils I6 serve to quench the inter
ing in an extension 36 of the latching lever 23.
î rupting arcs occurring between eachpair of> con
VThe springs have the tendency to hold each'
, tacts II and I4 during the interrupting opera- `
weight in the inoperative position shown in Figs.
i tion.v The stationary contacts I4, their terminals
4 and 7. Each combination of weight and spring
, I5, the blowout coils I6, and the terminals I3 of 25 thus «forms an oscillatory system which tends to
. the ‘movable contact II are mounted on a'com- ~
vibrate in its natural Afrequency when the latch
i mon base I1 molded of insulating material which
Y ing device and the apparatus on which it is
‘ is ñrmly secured to the magnetic structure I.
mounted are subjected to shock. The springs
¿ The base I1 has a recess or groove I8 in its center
4I through 44 have different diameters and, con
1 portion and a ridge I9 which traverses the recess 30 sequently, diiîerent stiffness. As a result, the
in order to increase the mechanical strength of
natural frequencies of the four oscillatory sys
i the molded body I1.
tems are diiïerent.
The armature assembly, including the arma
ture proper and the elements 9, 28, Il’ and II
These frequencies are so
graduated that they cover the desiredl range
within which the latching device is intended to
1 attached thereto,'is so biased by the spring I0 35 be operative.
that the pivot edge of the armature 1 is held
The operation of each oscillatory system will
` against the dihedral pivot bearing at 6 (Fig. 3).
be understood from the following reference to
1In this manner, the armature assembly is con
Fig. 5 showing the weight 3`I in two different posi
` strained to perform angular movements about the
tions, both occurring 'during an oscillation. One
axis of the pivot bearing towards and away from 40 of these positions-of weight 3| is shown in full
î the magnet'core. The force of spring I5 has also
lines while the other is represented in broken
Í a component which biases the armature assembly
lines. During an oscillation, the' projection 5I
. away from thel magnet core and towards a sta
of the weight 3| will move towards the lever 23
tionary stop formed at 5’ (Fig. 3) by the portion
and push it into the latching position. Upon re
l 5 of the abutment member 4. When the arma
versal of its oscillatory motion, the weight 3| will
ture rests against the stop, the movable contacts
II are separated from the stationary contacts I4
(Fig. 2) so thatr the circuit between each pair of
`terminals `I3 and I5 is opened. When the relay
lcoil 3V is energized, the armature 1 is attracted
by the magnet core. 2 and moves its contacts II '
into circuit closing position.
move its projection 53 towards the lever 23, as
shown in broken lines,v again with the effect of
moving the lever 23 into latching position. C‘on
sequently, as long as any of the four weights
oscillates, the lever 23 will be held in the latch
ing position.
Assuming that the contactor was in the contact
openingv position shown in Fig. 3, the lever 23 ’
when operative will prevent the latch 20 of the
In order to prevent the above described con
tactor _from performing undesired operations
`when subjected to shock and vibration, especially
armature from moving towards the closing po
sition. This is apparent from the full-line show
ing of latch 20 in Fig. 5.
Assuming that the contacter was in the vcon
`as occurring on naval vessels due to the lopera
‘tion of their internal equipment or by contact
`with external objects, a latching device is pro
lvided. This latching device includes a substan
tially U-shaped support or frame structure 2 I con
tact closing position before the occurrence of
60 shock. the latch 2U of the armature will assume
Ísisting, for instance, of a sturdy metal casting
the position shown in broken lines in Fig. v5.
Consequently, the opening 25 of the latching lever
23 will engage the latch 20 and prevent it from
`whose base portion 22 is mounted by means of
screws 22’ on the insulating base I1, the screws
‘22’ serving also to attach the base I1 to the
leaving the contact closing position.
lmagnetic-structure I of thecontactor.
Referring to Figs. 4, 5, and 6, a channel-shaped
latching lever 23 has its flange portions 24 ful- v
Since all four oscillatory systems operate the
latching lever 23 in the manner just described, the
latching device will be eñective upon the occur
Qcrumed about a pin 2B which is mounted between
rence of any shock or vibration condition capable
the two parallel legs of the support 2I and located
of causing anyv of the four systems to oscillate.
relatively close to the base portion y22 of the struc 70
In the embodiment represented by Figs. 8 and
ture. Another pin 21 secured between the `legs
9, only two oscillatory systems are provided while
of the support 2I at a place relatively remote from
the latching device is otherwise designed in ac
the base portion 22 has av projection 29_ which
cordance with the above described embodiment.
serves as an abutment or holder for a wire spring
The contactormay. also have the same construc
28. _'Ifhis Yspring is Wound around the pin 26 and
tion as shown in the foregoing, although it will
be understood that devices according to my in
vention can be used to advantage with other con
tactors or apparatus of any type in which a mov
able member is to be safeguarded against changes
of position due to shock or vibration.
In the embodiment according to Figs. 8 and 9,
the two oscillatory weights are denoted by 35 and
31. Each of these weights is connected with a
wire spring, such as spring 45 shown in Fig. 9.
These springs are in engagement' with an exten
sion of the latching lever similar to extension 36
in Figs- e, 5, and '7. Weight 35 has two projec
tions denoted by 53 and 54 for engaging the latch
ing lever 23 in the manner described in conjunc
tion with the foregoing embodiment. The pro
jection 54, however, is secured to the weight 35
to one of said weights respectively, >said lever hav
ing a projection located near said first shaft and
extending away from said shaft at the side of
said Weights,l and said springs having their re
spective other ends` engaged by said projection,
said Weights and appertaining springs forming ¿
inertia controlled oscillatory systems of different
natural frequencies.v ,~
2'. A device for latching a movable member in
response to the occurrence of sh'ock, comprising
a support, a latching lever fulcrumed on said
support for pivotal motion between a latching
position and an unlatching position, a spring dis
posed between Vsaid support and said lever to bias
the latter towards inoperative position, a pivot
shaft secured to said support, a plurality of os
by means of a screw 55 which permtis adjusting
cillatory systems cf vdifferent natural frequency
scription that since the range of shock or vibra
allel to one another.
tion frequencies to bev covered by the latching
device is embraced by virtue of a multiplicity 0f
oscillatory devices, the damping of each of these
response to the occurrence of shock, comprising
having a *plurality of respective weights> ful
the distance between the projection and they
I crumed on said Apivot shaft vin parallel to one y
Weight 35. The weight 31 has similar projec
tions, one of them being denoted by 54' and pro 20 another so that~each is capable of independent
oscillation for moving said latch means into
vided with an adjusting screw 55'. The opera
latching position, `and a plurality of straight
tion of this modified systemA is similar to the one
strand-shaped springs attached to said Weights
discussed in the foregoing.
respectively and extending substantially in par
It> will _be apparent from the foregoing de
devices need not be as great as is necessary in
3. A device for latching a movable member in
movable latching means normally maintaining
an unlatched position, and a plurality of me
the known vibration responsive devices `with only 30 chanical oscillators of different oscillation char
acteristics arranged for individually controlling
one oscillatory system. The reduction in damp
said latching means to move into a, latching posi
ing thus afforded with respect to each individual
tion upon occurrence of shock, each ofsaid oscil
oscillating system has the effect of increasing the
lators including a movable weight and a substan
sensitivity of response .to my device, and hence
represents a considerable functional improve--‘ tially straight piece of spring wire, saidwires
having substantially th‘e same lengthrand differ
nient over the known latching apparatus of the
ent stiifness to provide for different naturalfre
vibratory type. As a result, my improved device
quencies of said oscillators.
responds more readily to high and loW impact
4. A `device for latching a movable member in
forces and does not require a special adjustment
response to the occurrence of shock,k comprising, '
of its individual oscillating system as regards the
in combination, a support, a lever pivoted on said
determinants of the oscillation characteristics.
Y support and forming a latch at its end remote
Latching devices according Vto my invention
from its pivot axis, said lever being biased to
form a unit separate from the contactor or other
vnormally assume an unlatched position, a plu
apparatus to be protected. Due to this fact, the
latching devices can be separably manufactured 45 rality of Weights pivotally mounted on said sup
port for individually engaging said lever between ’
and assembled and are applicable in connection
said end and said pivot axis, and a plurality of ;
with electric devices of different design and type,
it being only necessary to'provide the movable
springs having one end attached t0 said weights '
respectively and the other end in engagement
corresponding to part 2l) in the above-described 50 with said lever at a point near said pivot axis,
said weights and respective springs forming in
ertia controlled oscillatory systems of different ,
I am aware of the> fact that latching devices
natural frequencies.
according to my invention may be modified in
5. A device for latching a movable member inv
various Ways without departing from the objects
. and'essential features of my invention. There 55 response to shock, comprising a support, a, latch
lever pivoted to said support for motion between
fore, I intend the foregoing description to vbe un
a latching position and an unlatching yposition
derstood as illustrative and not in a limiting
and being normally biased toward said unlatch
ing position, said lever having an end portion
I claim as my invention:
l.. A device for latching a movable member in 60 remote from its pivot axis arranged relative to
said member so as to'prevent movement of said
response to the occurrence of shock, comprising,
member when said lever is in said latchingiposi
combination, a support, two pivot shafts
tion, an inertia weight pivoted to said structure
mounted on said support in parallel to each other,
about an axis extending in parallel to the pivot
a latching lever mounted on one of said-shafts
for angular motion and extending in the general 65 axis of said lever and arranged adjacentto said
lever substantially between ksaid latter pivot axis
direction towards and beyond said other shaft,
and said end portion so that said weight, when
a plurality of weights mounted for individual
oscillating due to shock, causes said levery to
angular motion on said other shaft and having
move into said latching,v position, and an elon
each two projections at opposite sides of said lat
ter shaft for engaging said lever in order to move 70 gated spring having one end attached to said
weight and Ahaving the other end in engagement
it into latching position upon oscillation of any
member or armature of the device with a latch
. with said lever near said pivot axis of said lever.
’ of said weights, a corresponding plurality of
strand-shaped springs having one end attached f Y
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