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Oct. 29, 1946.
2,410,055
P. G. FRERER`
~
SNAP SWITCH.
Filed July 28,1944
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29
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ATTORNEYS
Patented Óci. 29, 1946
2,410,055
¿UNITED STATES PATENT OFFICE
2,410,055
‘ ‘
SNAP SWITCH
Paul G. Frerer, Milwaukee,- Wis., assignor `to
.Perfex Corporation, Milwaukee, Wis., a corpo
ration of Wisconsin
Application July 28, 1944, Serial No. 547,020
11 claims. (c1. 20o-67)>
1
2
This invention relates in general to switching
mechanisms, and more particularly to snap ac
tion switches of the self-contained or enclosed
type. The primary object ofthis invention is to
2D which extends upwardly through the base and
which is threadedinto the base portion I5 of the
provide a snap switch construction which is sim
ple and dependable and which may be manufac
bracket I4 is a pivot pin 22. This pivot pin sup
ports a rocker member generally indicated as 23.
This'rocker member is formed with a pair of
tured economically.
A further object of the invention is the provi
sion of a snap switch mechanism which is readily
adjustable after assembly so as to obtain opti
mum switching action.
\
Other objects will appear from the following
description and appended claims.
¿For a full disclosure of the invention, reference
is made to the following detailed description and
to the accompanying drawing, in which, y
. Fig. 1 is a top View, with the cover` removed, of
one form of snap switch embodying the inven
tion;
y
‘
bracket.;`
i
‘
.
Extending between the ears I6 and I1 of the
downwardly extending ears 24 and with outward
ly-extending arms 25 and 26. Attached to the
mid-portion of the rockermember between the
ears 24 is a spring blade 21 which carries movable
contacts 28 and 29 at its two free ends. The
arms 25 and 2S of the rocker member are ofi-set
adjacent the movable contacts so as to provide
portions 30 and 3l which are adapted to engage
the rear of movable contacts 28 and 29. These
off-set portions are formed with openings 33 and
34 (Fig. 1) through which the spring blade 21
l
extends. These openings are wider than the
VFig. 2 is a side view, partly in section; and
20 thickness of the spring blade 21 and permit'l a
_ Fig. 3 is a view similar to Fig. 2 of a modifica
limited amount of motion of the ends of the
tion.
»
spring blade relative to the arms 25 and 26.
Referring to the drawing, reference character I
The bracket I4 also supports a second pivot pin
indicates a base member forlthe snap switch unit.
36. This pivot pin carries a leaf spring 31 which
This base -member is of `elongated rectangular 25 bears against an upward extension 38 on the
shape andV is provided with transverse holes 2
rocker member 23. This leaf spring 31 is actu
andl 3 which are adapted to receive mounting
atedk by a plunger 39 which extends through. the
screws. Preferablymoulded in the base member
cover 40 of the switching mechanism.
is a terminal bushing 4 which is screw-threaded
The left hand leg 26 of the rocker member is ~
to receive a terminal screw 5. This bushing ex 30 formed to provide an armature which cooperates
tendsthrough the base member and at its upper
with a U-shaped permanent magnet 42 which is
end supports a contact stud 6 which carries a
received in a `cavity formed in the base member
stationary contact 1. The contact stud 6 is screw
I. - This permanent magnet is held in place by
threaded in the terminal bushing and is formed
an extension of the base portion I5 of bracket I4.
with a hexagonal socket 8 which is adapted to
I . When no pressure is applied to the plunger 39,
receive a Wrench which may be inserted through
the permanent magnet 42 causes the parts to
the open end of the bushing 4 when the contact
assume the> positions shown in Fig. 2. Thus the
screw 5 is removed.
'_
Y
magnet has pulled the rocker member 23 in a
Located on the other end of the base member
counterclockwise direction which causes the mov
is a second terminal bushing 9~ which may be 40 able contact 28 to engage contact 1. At this time
identical with the bushing 4.- This bushing 9 re
the right ,hand end of the leaf spring 21 is en
ceives a terminal screw I0 at its lower end and a
gaged by the bottom of the opening 34 in the
contact stud II at its upper end. The contact
rocker member, which insures that the movable
stud II is identical with the contact stud 6 and
contact 29 is disengaged from its corresponding
may be adjusted by a wrench inserted through
the terminal bushing 9.
`
ì
._
i
Suppßrted .on the upper face of the base I is a
U-shaped‘bracket I4. This bracket consists of
a base portion I5.and >a pair of ears |16 and I1
(Fig. 1) which extend outwardly from the base.
The base portion of the bracket I4_may be secured
to the base I by means of staking to a central
terminal bushing I8. This terminal bushing re
ceives a terminal screw I9. The bracket I4 may
stationary contact.
`
> `When pressure is applied to the plunger 39 it
bows the leaf spring 31 and applies a downward
force to the right hand end of the rocker mem
ber 23. This force acts in opposition to the at
tractive force _of the permanent magnet 42. As
the force on the plunger 39 is increased, a point .
will be reached at which the spring 31 overcomes
the attractive force of the armature 42. The
rocker member 2,3 will now snap to its clockwise
b_eadditionally secured `to ¿the basel by ascrew 55 position in which the contact 29 engageslcontact
4
3
ber which is added to the clockwise attractive
Il. At this time the contact 28 is positively dis
force of the magnet 5 I . Finally a point is reached
engaged from contact 1 due to the bottom of
in which the clockwise forces are greater than
the opening 33 in the rocker member engaging
the contact spring 21 adjacent contact 28.
As the plunger 39 is permitted to move out
wardly the spring tension on the spring 31 will
the counteràclockwisel force of magnet 42 and
the rocker member 23 snaps to its clockwise posi
tion.
When the inward force of plunger Á50 is removed
the rocker member 23 Vwill vremain in its clock
be decreased to a point at which it is vovercome
by the attractive force of the magnet 42. 'When
wise position due to the fact thatv the attraction
this point is reached the rocker member 23 will
of magnet 5I on armature portion 25 will now
be greater than the attraction of magnet 42 on
armature portion 26. When an outward force
snap in the counterclockwise direction, thereby „
disengaging contact 29 from contact Il and en- "
gaging contact 23 with contact 1.
.
It will be noted that when the contact _28 is in
engagement with the contact ‘1 the -portion 39
_is applied to the plunger 50, this will be trans
rear face of contact 28. By this arrangement
stationary contact 1 acts as a positive stop to
23. When this force, coupled with the attrac
tive' force of magnet 42, becomes suñicient to
overcome the attractive force of magnet 5l, the
inittcd ,through the spring 31, thereby applying
of the rocker member is in engagement with the 15 'a cpuriterfclockwi‘sfe force to the rocker member
the counterclockwise rotation of the rocker mem
ber. Thus adjusting of the contact stud ‘6 in the
terminal bushing 8 provides an adjustment for
rocker member will snap to its counter-clockwise
_
20 position as shown.
` In Fig, 3 it wiil ‘be apparent »that adjustment
the lspacing between the armature portion 26
of the contact stud-6 will determine the degree
and the permanent magnet 42. As this spacing
ture increases. This attractive ¿force determines
of inward force required on plunger‘Eß in order
to operate the> switch in one direction, `and that
adjustment of the contact stud II will determine
plunger 39 in order to operate the switch. »This
the outward force required on plunger 50 to oper
is decreased, the attractive force of the arma
the’ïamount of force that must be -applied to 25
ate the switch in the opposite direction.
From the foregoing it will be apparent that
the present >invention'provides a simple and pos
attractive vforce may be adjusted so as to obtain
the desired degree of snap action by turning the
contact stud 6V in bushing 4. This may be done
by removing thelterminal _screw 5 and Vinserting
itive snap switch construction. It -will also'be
30
apparent that the present invention provides a
construction which-may be 'readily assembled.
a' ‘hexagpnal Wrench through the terminal bush
ing;
It will be further Aapparent vthat the invention
‘ VIt is also desirable to provide an adjustment for
provides _easily accessible 'adjusting means by
_the gap between the contacts when open. It is
necessary for this gap to be Wide enough to in 35 which the switch may be calibrated -fo'r securing
optimum switching action.
'
sure _a positive _separation of the contacts. At the
’While Iihave shown and described only »two
same time itis desirable to limit this gap as much
forms of the invention, the construction may be
as possible, as this reduces the amount >of work
varied considerably Without departing from the
required toïoperate _the switch. This contact gap
scope of Ythe invention. I therefore desire »to be
maybe adjusted by rotating the contact stud Il
limited only by the scope of the appended claims.
in the terminal bushing 9. This is preferably
What is claimed is:
« "_ '
done by inserting a tool through the outer end
of the terminal bushing.
¿In the arrangement shown in Fig. 2 the‘switch
is pperated in one directionk by pushing plunger
ëil‘in, and is >_operated in the other direction by
fl. In _a switch unit, _a base, »a switch arm on
one side ofthe »base and pivoted thereto, a mov
. able ‘contact operated by said switch arm, a sta
tionary contact cooperating with said movable
contact, »adjusting means for 'the stationary con--`
permitting the plunger'ßä to move outwardly. In
sorne applications vit is desirable to have »the switch
tact', a terminal member having a ¿screw hole for.
operate with'a push-pull action. In other words,
it is desirable ¿t0 `have the switch remain in actu
ated position until the plunger _is actually pulled
50
mounting 'a terminal screwon >the other vside of
the base7 the screw hole forthe terminal screw
being iin alignment with the adjusting means for
ou-t.' instead of simply being allowed to move _out
wardlyt This action may be obtained by the> ar
the stationary contact whereby the >stationary
rangement shown in Fig. 3. In this figure the
construction is substantially identical with the
construction of Fig. 2, except for the plunger 50
a'- d Ithe‘inclusion of an extra permanent magnet
51.*" The permanent magnet 5I is -held in place by
through said screw hole.
an _extension 5_¿2 of the bracket base l5 which is
secured to the -base I by means of a screw 53. The
plunger 5i! is formed »with an enlarged head 54
which» is attached by a link 55 to the spring
blade 31.
With the parts in the positions shown, the
plunger 50 has been pulled to its'outermost »posi
tion. The armature portion 25 is now closer to
the permanent magnet 42 than the armature por
tion 2dV is to magnet 5I. The attractive force of
magnet 42 is therefore greater than the attrac
tive force of magnet 5I, and the rocker member
23 is therefore held in its counter-clockwise posi
tion in which the movable contact 28 engages sta
tiqnary contact 1.v
'
'Whenthe plunger 50 is pushed inwardly, it ap
plies a counter-clockwise force to the rocker mem
Contact mayl Abe _ `_adj-usted by a tool inserted
v
'
2. In »a's'witch unit, a base! a switch arm on one
side of the base and pivoted thereto, a movable
contact operated ‘by Ysaid switch arm, a hollow
terminal bushing extending throughY-t’heÍbase for
mounting a terminal screw on the other side of
the base, a stationary `contact screw threaded in
the terminal bushing on said one_'side of the base,
said stationary contact cooperating with» said
movable contact Aand Vbeing adjustable by means
of a tool inserted through said hollow bushing..
`3. In-a-n' enclosed snap switch unit, a fbase,1a
switch arm o_n one side of the base and pivoted
thereto, »a cover for the snap switch unit, means
extending through the ycover for actuating said
switch arm, a movable contactactuat'ed b_y said
switch armg a permanent magnet secured tothe
base, an armature coçperating’rwith said mag-net
for causing vnflovement of the movable contact
with ysnap action, _astationary contact-,cooperat
ing with said `movable vcontact ‘and »forming a
75 stop for limiting movement ofïsaid armature with
respect; to the-magna, adjusting means for the»
stationary contacta terminal member havìnga
screw hole forA mounting a terminal screw onthe
tacts and >being 'formed with òpeningsthrough"
which the spring blade means extends, the edges
of said openings determiningthe limits of`lost
other side »ofthe Ibase,` the Vscrew hole for thel
motion between the ends ofthe spring blade
terminal >screw being in alignmentfwith the- ad-` 5 means and the rocker‘member, vsaid rocker mem
justin'gmeafns for the stationary contact'whereby
ber being formed with an arma-ture portion `be
the stationary contact may be adjusted by a tool
tween the spring blade means and the base„al
inserted through said screw hole.
f
permanent magnet secured to the base‘ adjacent
4.~In an’ enclosed-snap switch unit, a base, a
said ‘armaturelportiom and .a resilient actuator
switch arm on one side of the base and pivoted 10 for applying force to saidV rocker member,
thereto, a cover for the snap switch unit, means
extending through the cover for actuating said
switch arm, a movable contact actuated by said
8. In a snap switch unit, a base, a pair of spaced
stationary contacts secured to the base on one
side thereof, a rocker member pivotally secured
switch arm, a permanent magnet secured to the
to the base at a point between said stationary
base, an armature cooperating with said magnet 15 contacts, spring blade means attached interme
for causing movement of the movable contact
diate its ends to the rocker member adjacent its
with snap action, a stationary contact cooperat
pivot, said spring blade means extending general
ing with said movable contact and forming a stop
ly parallel with the base and having a movable
for limiting movement of said armature portion
contact adjacent each end thereof cooperating
with respect to the magnet, a hollow terminal 20 with a corresponding stationary contact, the
bushing extending through the base for mount
rocker member comprising oppositely extending
ing a terminal screw on the other side of the base,
arms located between the spring blade means and
said stationary contact being screw-threaded in
the base, said arms extending perpendicular to
the terminal bushing on said one side of the
the base adjacent the movable contacts and being
base and being adjustable by means of a tool in 25 formed with openings through which the spring
serted through the hollow bushing.
blade means extends, the edges of said'openings
5. In a snap switch unit, a base, a pair of
determining the limits of lost motion between
spaced stationary contacts secured to the base on
~ the ends of the spring blade means and the rocker
one side thereof, a pair of movable contacts co
member, said rocker member being formed with
operating with said stationary contacts, a switch 30 an armature portion on each side of its pivot, a
actuating member pivotally secured to the base
ñrst permanent magnet secured to the Ybase adja
at a point between the stationary contacts and
cent -one armature portion, a second permanent
adapted selectively to cause one of said movable
magnet secured to the base adjacent the other
contacts or the other to disengage its correspond
armature portion, and a resilient actuator for
ing stationary contact, a permanent magnet se
applying force to said rocker member.
cured to the base, an armature carried by said
9. In a snap switch unit, a base, a pair of
switch actuating member adjacent said perma
spaced stationary contacts secured to the base on
nent magnet, a pair of terminals mounted oppo
one side thereof, a rocker member pivotally se
site the stationary contacts on the other side of
cured to the base at a point between said station
the base, and independent adjusting means for 40 ary contacts, spring blade means attached inter
each of said stationary contacts, said adjusting
mediate its ends to the rocker member adjacent
means being accessible through said terminals.
its pivot, said spring blade means extending gen
6. In a snap switch unit, a base, a pair of
erally parallel with the base and having a mov
spaced stationary contacts secured to the base on
able contact adjacent each end thereof cooper
one side thereof, a rocker member pivotally se
ating with a corresponding stationary contact,
cured to the base at a point between said sta
the rocker member comprising oppositely extend
tionary contacts, spring blade means attached at
ing arms located between the spring blade and
a point between its ends to the rocker member
the base, said arms extending perpendicular to
adjacent its pivot, said spring blade means ex
the base adjacent the movable contacts and be
tending generally parallel with the base and hav 50 ing formed with openings through which the
ing a movable contact adjacent each end thereof
spring blade means extends, the edges of said
cooperating with a corresponding stationary con
openings determining the limits of lost motion
tact, the rocker member comprising oppositely
between the ends of the spring blade means and
extending arms located between the spring blade
the rocker member, said rocker member being
means and the base, said arms extending perpen 55 formed with an armature portion between the
dicular to the base adjacent the movable con
spring blade means and the base, a permanent
tacts and being formed with openings through
magnet secured to the base adjacent said arma
which the spring blade means extends, the edges
ture portion, a resilient actuator for applying
of said openings determining the limits of lost
force to said rocker member, and means for in
motion between the ends of the spring blade 60 dependently adjusting said stationary contacts.
means and the rocker member.
7. In a snap switch unit, a base, Ia pair of spaced
stationary contacts secured to the base on one
10. In a snap switch unit, a base, a stationaryT
contact secured to the base, a rocker member
pivoted to the base, ya spring blade carried by said
side thereof, Ia rocker member pivotally secured
rocker member and extending generally parallel
to the base at a point between said stationary 65 with the base, said spring blade carrying a mov
contacts, spring blade means attached at a point
able contact adapted to engage the stationary
intermediate its ends to the rocker member ad
contact, the rocker member including an arma
jacent its pivot, said spring blade means extend
ture portion extending generally parallel with
ing generally parallel with the base and having a
the base between the spring blade and the base,
movable contact adjacent each end thereof co 70 the rocker member also including a portion ex
operating with a corresponding stationary con
tending perpendicular of' the base adjacent the
tact, the rocker member comprising oppositely
movable contact and being formed with an open
extending arms located between the spring blade
ing through which the spring blade extends, the
means and the base, said arms eXtending per
edges of the opening determining the limits of
pendicular to .the base -adjacent the movable con 75 lost motion between the free end of .the spring
2,410,0ëëî l
7
8
blgde :and the. rQçker member, a. permanent, magg-¿
nefqlseeured to Lthe base ¿adjfacentvV-saiq @rmgisgre
eperetine with eaìd. stetieeary @meet and e, 1.11
portiqn, and e ,resilient lfe.«.ela_1:240,01*.íexteeníldmaker `
ated hy `‘seid reeker member. Sleep
Y,
meen?
.associated withy seid rocker member, answered
11. In a snap switßh unit, .e baise, <a ,stetimery 5 @webv pm earned. by Seid, bracket, e lee@> Spring
pìveted on seid second pivot pin. end enges-ine
Contact secured ,'to the basefa braçliet «mounted
seid rocker member, and en eetueter bearing
on the base and having ears extending outwardly
against said leaf SPI'lÍllg»
,
fmmthe base, .a ñrst pivot pin extending between
PAUL Cr.
the ears of said braçket, a I‘Qçker .member @2S
membeç.
tending generally parallel @f_-the hase and pivoted 10
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