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Патент USA US2131590

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sept. 27, r1938.
C. JHATAÓ‘RN'
_ Patented sept. 27, 193s
* - 2,131,590 ;
i
4 V>Clarence John llathorn, St. Ma’?yafl’a.,
__
_ ' to`The StackpolejCarbon'(lornpanyfst.v Marys',
y Pa., a corporation of Pennsylvania`
‘ `f^
`
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"
` Appueanen Jànuarym, 1937,y sel-MN». 121,529
_ »n
_
`
"'*fs
(0_1. zot-U67) jf
My invention relates to the-control of anelec- Y
tric circuit and relates particularly to a snap
_ switch for completing or> interrupting the circuit
~ _ Fig. 31s an exploded >partofthe. elements com- '
prising my improved _"snap=switch‘.~4
6 . at
~ Myv
the invention
option ofthe
is. >particularly
operator.- ’ adapted
»
‘
for
_
use
.
»
‘ Fig; 4 is e-pianviewvof-.the _msu1etedfíbese 5
' ~ Fig.- 5 is a'plan Vviewíol! my snap switchand its j
as a switch combined with. a volumer‘control
.wherein both the switch and thevolumecontrol
are. actuated bya single controlî.s_haft. yAn ex
actuator.
A
"
l.
_
_g
_
-
y.;
_
y
_
f yI‘ig. G'isa. lsideviewmffthe device'shown _in _
‘ ample-of a combined unitis shown'in my_prior
Patent No. 2,057,829, granted October. 20, 1936.
Fig. 'l is a plan view ofafmodincationzof my l10 '
The particular switch .under consideration is as -~ invention, _theswitch being shown rvin anïopen’cir
sembled within. a housing whose external diam
eter _is approximately one inch and- the _thickness _ .Fig-„B_is'a plan-_.»viewcf
with a dielectric
_cuitfposition._
3of which is approximatelyfone-quarter inch.
_ 15‘
duce the number of partswhich have heretofore
_
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v
I
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f
.shield positioned _fbetween the; actuating» spring
Itis an object ofnmy present invention -tore- '
been' used in a snap switch.
f
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_and -thestationary terminal-
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..
_
.
_
.
l5
_` Fig.;9 is a sectionalview taken. onf-the line
_
Y.
._
- ._ It is a further object> of my inventionto Lelimi
' ofFlg«.'8.~
«Figlio-_ris a pianyiewof
v e
the.dielectric'yshieldl
_
.nate undue'sparking or the freezingof: th'e _sta
_alone._«~
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_.
__.
_
._
._
y,
`20 tionary terminals Aand the movable bridging g ' :Fig-111s arfragmentary enlarged lview of the 20
vswitchfshown infFig. 7;;A
member.,
Itis another~ object oi' Y»
vmy invention
'_
._to have
a'combined rolling and Irictional contact "tbe
tween the fixed contacts and the movable bridg
25 ing memberv whereby the. main'contact surfaces
will always be kept clean.
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_
_
_
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_ Fig.. 12 ’is a vfragmentary view _of
l
the switch partlyfin` closed ` circuit. position. f '
in-closedf-circuit. positiomfÁ Y
»
f
-25
-. Fig. :14 is -a view ‘similarv toFigrll- but‘ywith ,thek [_ e l’
_ _ ‘
switch beingiin partial open’circuit _îpositioniV
YAnother object of my'invention is to provide
a switch wherein the arcing occurs on auxiliary
or arcing portions of _the contacts, and the main
-~ Fig; :15’ is a. .view_ïsimilar 12o-„Fig 11 k*but lthe
switch is in partial _open circuitpositionm
30 contact is made. _between surfacesV other than _». Fig.116.is a planyiew ofthe modified electrical 30 Ü
those
wherearcing
occurs.
e
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f
f
.
_
bridging
member.
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Another objectof my invention isto reduce _ Referring now in greater detail-to
the size of the movable electricalbridging mem _in Fig. 1 is vshown _afmidget type of.> snap `switch
ber so that it may be manufactured -in quantity
35 lots at a _low cost.
_
I 'I
wherein .the overall diameter of the switchis, ap- e
«
proximatelyone` inch, and thecverall-_thickness 35 _.
Another object of my invention isto provide
'oithebase is one-quarter inch.>
-a compact snap switch of sturdy construction
--
e
'I'he switch mechanism hereinafter further de
scribed is mounted Within_a_-__cl_iamberv of an in
V which may be utilized in „combination with a
~ volume control wherein a single control actuates
sulated base;generallyfdesignated-¿as A, _which- is- _
40 both the switch and the volume control but
preferably _composed of a molded vphenolic con- 40
'
.wherein actuation of the switch to closed circuit
densation product.
'
f
’
A bodyportion Ill of." the baseis'tsubstantially n - y
position -is eiïected by a relatively small‘movc
ñat, and'i’ro'm the base’s peripheryi whichis sub
ment of theicontrol in one direction and 'pf’erxnit-`
stantially „perpendicular to 1» the Vflat surface, yex
ting a relatively large movement in the samedi
45 rection without effecting the operation olfV the tends a.- flange I2 which is-circular o'nitsfputer 45°
curvedsurface. Thexflangel .I2 _has 9; »plurality _
switch or the switch may be utilized alone.
`With the above'and related objects in view, ' of recesses or notchesll- and I 5 on the inner
curved portion. of the iiange,„and,_the¿recesses
' my invention consists in the details of construc
communicate ’with> ¿the central -chamber'of the .
Ul o tion and the combination of parts that will here
base. The `central chamber ls'= in communication» 50
luefter be fully described when the description is - with a bridging member4 and terminal chamber I6;
» 'read in _conjunction with the accompanying draw- _ ~
ings, in which:'-"`
g
__*
_ _ .
Fig. 1 is a plan view of a snap switch kembodying
ß
my invention.
_
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_
_
_
_
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__* _
The'notch I4 and opening llAreceivearpintle l
I 1, and the converging wallsV .18», .I9 partiallydee _ _
:lining-.the notch I4 serve as complementary stop
_ members for a switch trigger, generallyqdesig-"Bö
2,131,590
nated as B. The trigger B 'pivotally mounted
Aon pintle I1 comprises a flat body portion 20,
which has openings 22,23 located atits respective
ends. One opening 22 receives a portion of the
>pintle l1, and the other opening 23 receives a
portion 24 of a torsional spring, generally desig
nated asC. ISpacedäparallel ears 25, 26 are
The flexible stationary electrical terminal E
which is made of suitable electrical conducting
material is rigidly held in thebase A in a manner
similar to that by which .ñxecl terminal D is held.
.The terminal has an eye in its outside extending
portion 50 to which an >electrical lead wire may be
attached, as by soldering. .- .The eye-portion 56"
integrallyformed fromfthe side edges of the base `merges- with a central fiat portion 52, v„the latter
and extend at right angles to the base of the
10 trigger. Each of the spaced ears 24 or 25 is en
gaged by an eccentrically mounted stud 21 which
interiits lwith "a complementary opening 54 in the
Vbase A. The central portion 52 is integrally con
nected with a widened portion 56 that provides V
oscillates the trigger, hence actuating the switch.- two :shoulders 51, 58 that abut against the base
'I'he notch I5 enablesthe coiled portion`28 of
`Shoulders, 60,.,6l extendingon the outside of
the torsional spring C‘to freely fmove without ~ thebasaare expanded to overlap the outside por
15 engaging any portion of the flangem§|2 or the, ftion 4of _ the baseso that the terminal cannot 15
base A.
`
move in either a longitudinal or transverse di
`
‘I'he bridging member and terminalrecess >I6 " rection. . Extending" at right` angles to the
receives the contact portions of each of >the widened portion 56 and integrally formed there
terminals D and E, and the recess I6 also're
20 ceives an electrical bridging memben'disc, or
roller, generally designated‘as F.
witlris an intermediate springllke portion 62
whichisrlimited by the wall 64 lofthe'recess I6
The afore
in moving to the left;` as Fig. 1' is-viewed, but may
mentioned elements» will 'be `hereinafter ‘ further f freely move to the right;v From the intermediate.
described in considerable detail. ‘
.
portion 62 is the contact disc engaging portion .
.
'.The torsional springChas a central coiled or
25 closed portion 28.»and from the coiled portion
extend diverging legs 24 and 28. 'I'he spring C
has a .tendency to expand/as well asto rapidly
move the electrical bridging disc F from one-po
sition to another position.r
" 4
1.> 1
»66 which has a4 lower extension ißsthat abuts the
insulating base in the groove 69, and the ex 25v
tension 68 serves toy support the end of the
flexible extension“ 66.1 'I‘he disc'engaging portion
-of thefñexible terminal 1E is curved to` comple- j
mentarily engage a portionfof the curved-bound-r
bridging-disc F until the medial axis ofrtheclosed
ing surface of the bridging‘disc
c
. It should be noted lthat in the`position illus
Aend »of the` spring ' C `passes ' slightly beyond dead
. trated in Fig. 1, the flexibler arm 66- is spaced
` Movement ofthe trigger B‘does not actuate the
center as the trigger compresses the Íspring-arms
of the torsional spring` C together. 1 The' energy'`
35 stored in thespring rapidly` moves the contact,
either closing the> electrical circuit 4when the
terminals D‘and E are >bridged' „or breaking the
circuit when the electrical contact ismoved away
“from the terminals. The tip 36.,of leg v2!! >enters
40 a bore 3-2 of the cylindrical'end >34. of ’ani insu
lating 'bushing 'G,- which .cylindrical end'34 inter
fits with a. central opening `36 of theelectrical
`disc'lF.>` However, the end 34 terminates‘short of
the lower surface of the disc F so that it pro
45 ‘vides no obstacle' to the movementof the roller.,
30
from a» wa1l10,.and the connecting portion 62 is
also spaced .ffromits limiting` wall' 64.` However, "ï
' when the triggerisoscillatedto Aclosed circuit po
35
sition, the roller bridging disc F ñrst‘engages
the fixed terminal D beforeit engages the flexible .
4terminaL’and the arc created when the electrical . '
Acircuit is opened occurs- on a portion of the con- .ß
tact 66 which is not the final surface engaged be 40
cause-fthe‘fdisc F pushes the contact 66 against
the "wal1f10.’ In rvotherwords, arcing occurs 'be
tween "auxiliary portions of each terminal which
are lnot the flnal or main contact surface.
.1
, Repeating the above in other terms, when-` the
The ïleg 24 of spring C has anrofl'set therein `-circuit is to be broken, it is to be'noticed that
so that a portion of the spring'engages -an'upper ‘g theflexible vterminal Àcontact '66`»will follow in "
portion `of the flat body 20,)an`d a portion of- the directcontactïwith bridging` disc'F'for -a short
same leg` engages a lower portionY of the trigger distance, -and the breaking-arc will take place
50 body so that the leg 24 cannot jump fromL-the " near the end 45 of the fixed terminal D.
trigger;>
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~
“
«
, " It is to be particularly observed thatthe lower
>
` `It is -to be noted that the ‘electricalbridging
disc F is pressed downwardly on the base and is
moved into engagement or >away from'engage
Amost flat portion 13 of disc-F adjacent the curved
»bounding surface'rolls upon va narrow' ledge' 15,
thus minimizing the friction A¿between vkthe base
and the disc
However', the disc F both rolls
55 ment with the electrical‘terniinals D andïE solely
by the ‘spring C.'~
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. y
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e The rigidlstationary electrical terminal D made
'and frictionally engages orwipes thev stationary
`rigid -and flexible’terminals D and E. This fric
of a single piece of electrical >conducting metal has „ tional action smooths or erases any irregularities
an externaleye portion 38 to which an electrical orf' obstructions due to oxidation,` pitting, or dirt
60 lead wire may be attached. The leye portion- so ,the ,contact resistance is kept low; Oxidation,
pitting,- or dirt .generally results in high contact
merges with a central fiat portion`40 which'inter
ñts with a-"complementary opening f 42 in the
resistance between the terminals and the bn'dg.
baseA, and the main contactv surface 44 of the
terminal 'is of a 'greateriwidth than the width of
the intermediate portion’40. " The aforementioned
ing memben
y,
l
.
‘
In order to avoid any ñashovers between the
spring C andtheiiexible terminal E, a thin piece
structure enables -the terminal D to be readily of insulationlmay A_be placed between ksuch ele
inserted in the opening 42 so that shoulders :.45 >ïnents in a manner _not to obstruct the operation
and 46 abut against the base, and then the- out
of the switch.
'
side ends 41 and 48 on the intermediate portion
When the disc F is .in open' electrical circuit~ <
position, it >rests Von the ledge 15 vand against the
70 40 are expanded into engagement with an out
side portion of the base. Hence,~the terminal is wall` 18.- ' The >Wall 18 is formed vinïlalignment
held in position. `The main contact portion 44'of 'with the contact surface of the fixed terminalD, ~
the terminal abuts a portion of the. vertically and the »wall‘is-turned'at right -angles toilirnit the
extending side wall so that the force .exerted by .movement of Vthe disc F in its open circuit Aposi- f5.1
the bridging disc F cannot move the terminal.
75
tion.
" 2,131,590
, .- A metal cover 'il-may be placed over the switch
and a control shaft 16 may be suitably journaled
to the cover. The cover may be groundedror
connected toA a point of zero- potential in order ,
._
nt Abetween the flexible terminator th'efnxed teg."
minal, and it'lies within themainsurfaceof the
«base chamber. The shield
has» an-"elongated
fopenin‘gï 80 therein .which Aenableslfthe' insulating
-to reduce any stray electrostatic linesof‘force _f bushing «Gtow'freely slidei'back'and' forth;
`
or any stray electromagnetic lines >of force. The - Thus, Vit is seen that the above-detailed de-V
eccentric 21 which engages .oneY or the~ other »of -fscription particularly applies to theillustration
-~>the spaced or bifurcated members 25, >26 issuit ' vofrFig.ïß‘where‘the dielectriczor'insulatlng shield
ably‘ attached -to shaft 16 andactuates the trig - -H-ls disposedbetween theliverflexible terminals
ger B uponactuation ofthe shaft 16. »
Y «
fHowever.. the ‘switch may be inserted on a
E and the metallic spring C. This dielectric shield
reduces anyy danger' of -a flashover occurring ~be
' volume control as shown in my prior `Patent No. ~ .tween the live >terminalsE and the metallic spring,
2,057,829where a single vcontrolactuates both the particularlysince the distance between the spring - '
- switch andthe volume control but -wherein actu - and thenexible memberïis comparatively small.i f Ü
15 ation of the swi‘ch to closed circuit positionis „ and if.V a" iiashover- should>- occur,'_¿theY -îpotential
16A
V¿effected by a relatively small movement of "the
control in one >direction and permittinga rela
tively-large'movement of the control inthe same
y
î
-« direction without affectingvthevoperationfoffthe
lswitch.
ï
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_
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.,
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.r
If it should be desired to have the bridging»
î25
difference `between thefcoil portionV oi’l the :spring
» and the fixed terminal must `berelativelyY large. 11
stractureeut1med;in rigs;k '1 toV mythe stampedout electrical bridging member is shaped‘lto pro#
duce both a rolling- and‘1 a 'sliding action ~ whereby
Vdisc slid into'positlon'instead of rolled, la’ notch `- the wiping-»of the, 'contactfwill 'always'keep -the
may be- cut into'the flange ofthe insulating bush main: contactsurfaces` vclean and free fronij dust
ing; G so that ar‘mv 28 of spring C lies `w'l-‘h"-the` or dirt’fand-»free from corrosion, andthe Parcing ¿i
notch. This will lock the electrical bridging disc ' takes place upon auxiliaryl contact.terminals»so>V
and the leg of the torsional spring'together.'> ~
vthat/the vmain contact surfaces will be free from
` Referring now in greater detail to the 'ni'odi-i pitting -or-- excessive burning'.> `The clean >contact
. ñcation illustrated -in Figs. `7 to 14, I disclose a surfaces "lare" features _ whichl fmust >be present " in »
movable electrical bridging> member, generally -the ‘switch so‘ that 'the effective life ~of the -switch . I
30 designated as F1, which has an irregular curved
is» long; and ‘the clean1»¿main`~ surfaces 'also reduce 30
thecont'act `resistance between'the "ßstationary’ ..
Y 'I‘he electrical >conducting bridging member- has terminals and the movable bridging ¿member con
bounding
surface.
_
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l
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.
lan irregular bounding surface, which is arcuate
from the points b to c and e to f. The arcuate
35 surface b, c has a radius whichis of equal radius
. Although my _invention has been Ídesc?ibed fin
considerable" detail,` such.' description I is intended] `
to the arcuate surface e,-f. From the point' bis ~ as"-i_llust'rative 'E _1 rather „than l"lirn`iting,"~` since the '
a tangent which> extends to the left as Fig. I16> invention may? be- ,variously ` embodied, and’ thev
is viewed and which defines a portion» of the scope off»theinvention‘ïis K-toy‘befdetermined _aS-»_rk i f _ .
>fiat’ bounding surfacev a, b. A similar arrange
40
ment is made from the point cwhich defines
the fiat surface d, c. Tangent surfaces fr_om'the
ends of the arcuate surface result in thefiat sur
a stationary, electrical terminal and -a flexible, '1
faces f, a and e, d. Hence, the bounding surface y electrical » terminal, l»an electrical> bridging vdisc
of the disc is as follows:
_
'I'he fiat surface a, b and the arcuate surface
b, c, ñat surface c, d, fiat surface d, e which is
almost at right angles to the surface c', d, and the
arcuate surface e, f is the same radius as b, c,
50
55
60
65
adapted .to'engage said terminals whereby ythe- _ - ,
electrical circuitwill be closed and -to move away ,'45
from saidv terminals whereby the'electrical circuit
in, a small cylindrical insulating -bushinginter
and a flat surface f, a which is substantially at` -ñtting with the opening/in said disc, a flange on
right angles to the surface a, b.
‘ said insulating bushing adapted to engage the>
The bridging member F1 functions as follows: upper surface of said bridging disc, a forked _actu-5 '
When the circuit is partly closed from the initial , ating trigger pivotally mounted, a', torsional spring
>'position of Fig. 1l, it will be seen thatfthe bridg
having one end connected ¿,to said trigger, _and the _
ing member F1 is rotated slightly so that the flat other end bent at an angle whereby the Abent end 55
;
surface c, d engages and wipes the ñxed contact extends into the insulatingbushing, a portion `of
D, andthe arcuate surface e, f fits into the _said spring pressingupon the. insulating bushing,I
bowed portion of the flexible terminal E (see flange therebyfpressing said bridging member- in- f
Fig. 12). In the closed circuit position, as illus
a >direction jtowazjds ‘the base, and said-spring ‘
trated in Fig. 13, the curved surface e, f of lfhe adapted to directly move _said bridging disc in ._
bridging member F1 is still yin contact with’the one direction or the reverse direction depending
flexible terminal E, and the ifiat surface c, `d has upon the movement _offsaid springbéyond its y*
wiped along the fixed contact D.
dead center position.' ¿
.
`
1
,
_
._
It is .+o be noted, however, that the roller or
A2. A snapswitch comprising a base, a,> plurality
bridging member F1 is partly rolled into posi
of spaced electrical terminals mounted thereon,
tion, and in Fig. 13 the bridging member slides , a rotatable disc-likemetal bridging member free@l
into position. When the switch is actuatedïto. 1y movable across said base intoand out of en?
open the circuit, then the arc is broken so that
portions of the bridging member which are not
gagement withys'aidterminals, said bridging mem- _’
>ber being provided with an axial opening per- .Y >
used as the main contact surfaces take the arc. pendicular to said base, a pivoted 'trigger connect-f '
The are will be taken by point c and a portion _ ed to said base,_and a torsional spring having one
of the iiat surface e, d as the bridging member fend connected tothe triggerl and the other end
reaches the curved wall stop portion of the basev
and adjusts itself as rolling into its nest so that
it is in a position of Fig. '7 or 11.
75
"
will be opened, said disc having an openingtherê- "
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»
»
In Fig. 10 I show a shield of a conñguration t0
bent to project- loosely into 'said' opening, said
spring being adapted to rapidly roll said bridging
member into and out of bridging contactv with
said terminals as said trigger `is moved back `and
‘j `
-forth, said spring -being the only means forr hold-`
ing thev bridging member in position on the base
andfor actuating it.
e
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, ,
`
3. A-snap switch comprising a base, a plurality
, of spaced electrical terminalsmounted thereon,
a rotatable disc-like metal bridging member free- _
ly movable across said base into and out of- en
. gagement with said terminals, said bridging mem
vnais as said'trigger is moved back and forth, said f
spring being the only means for holding the bridg- t
ing member _in position on the base and for actu
, 5. Asnap switch Acomprising a base, a plurality
of spaced electrical terminals mounted thereon, ‘
.a rotatablediscàlike metal bridging member free»lymovable across saidÁ base into and out oi’y en
ber being provided-with an Vïaxial‘ïopening per Y gagement with said terminals, said bridging mem-4
10 pendicular =to said base, an insulatingbushing ber being. provided withan axial 'opening per
_disposed in said opening and projecting .above pendicular to'said base, a pivoted trigger con- ; c
the bridging member, said bushing being provided nectedvto said >base,»and a _torsional spring ,hav
`jwith an axial opening, a pivotedrtrigger/connected . ing one end connected to the trigger’and the other
,tol saidbase, and a torsional; spring having one - end bentito project looselyy into said-opening,
' bent to >project loosely into saidbushing opening,
said spring> being adapted to rapidly roll- said
>bridging member intocand out of bridging `con-`
saidspringïbeing adapted »to-„rapidly roll said
~ tact with said terminals as said trigger is moved
endlconnected. to the triggerand the other Yend
back and forth, said spring being the onlymeans '
bridging memberinto and out of bridgingrcon
`tact with-said terminalsas said trigger is moved- for holding thefbridging memberlriposition` on
`back and forth, said'spring beingtheionly means `
for holding-the bridging member4 imposition on
the >base and for actuatingit.v y
»
,
i Y.
, 4. A snap switch comprising a-baSe, a plurality
thek base andjfor actuating it, andl said >base 20
land terminals defining a guideway for the bridging i "
„memben
Y.
l
u
-~
'
-,
‘
‘
.
6." A snap switch comprising a molded insulated
of spaced velectrical¿terminals mounted ',the'reon,V base provided withl a¿-_recess, a-"pairof ,spaced
n ta’rotatable disc-likemetal bridging member. free
lyv movable across said ‘base> into and'out or en
gagement with said terminals,; _said bridging mem
ber- being'provided with an vaxial.,openingper
lelectrical terminals mounted insaidvbase >at', one
„end-_ ofA said recess, a. rotatable disc-like lr„1`u_eta.l-¿_.-
bridging member disposed in said recess and Iree
ly-.movable .thereacross into ¿and out of engage
4pendicular >to said _»base, anginsulatingbushing .K ment with said terminals,;_said bridging member.
>¿being provided withvan axlal'opening perpen -30
im'. disposed in saidopening and provided.at«its .outer
end - with a flange -extendingc radially-v outwardly dicular to said base, a 4trigger pivoted to said base
across the Abridging» member.; saidV bushing being " at one side of said recess, and a 4torsional spring
provided with an `opening perpendicular Y,to saidy :having ,one end. connected `to the triggerl and the
base, a pivoted trigger connected to said base, a other end projecting `loosely into said opening,
substantiallyv VU-shaped torsional, spr'ing«lying in saidA spring being adapted to rapidly roll said
,_a‘vplane substantially parallel ltoÍ saidf" base, ,one bridging member back and forth in said recess and
end of said spring'being plvotally vconnected to intorand out of bridging contact with said ter
.the trigger andthe other end ’being bent ¿sub-v minals as said triggergis oscillated, said vspring
‘stantially at _right 'angles-,and projecting loosely
into said bushingr opening: said spring being
adapted to rapidly >roll said bridging member
’ e into and outof bridgingcontact with said termi
being the only means -for` holding lthebridging
member in positionin the recess> and for actuating
ittherein._-`V
~
.Y
c
»
f
»
¿
\ _CLARENCE JOHN HATHORN.
40
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