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Патент USA US2117171

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May 10» 1933~
2,117,171
G. A. JoVHNsoN
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UNIT TYPE TUMBLER SWITCH
Filed May l1'?,v 1955
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iranl STATES
UNIT ma 'rUMBLr-:n s
George A. Johnson, Trumbull, Genn.,
ignor to
The Bryant Electric Company, Bridgeport,
Conn., a corporations! Connecticut
Appunuon _May 1v, lets, sei-iai No. 22,090
7Claims.
as my invention is described in connection with
This invention relates to electric switches.
More particularly it relates to electric snap
the accompanying drawing.
switches of the unit type. Switches of the type
to which this invention relates are commonly used
In the drawing:---
`
Figure 1.
Figure
a solid back.
‘
Another object of my invention is to Aprovide
a unit type flush snap switch with a, solid back
s0 casing and a cover which engages with the cas
ing and is held in‘ position upon the casing with
out the use of screws, rivets or other metallic se
curing members.
2.
s
_
.
Figure 4 is a detail view in elevation of one
of the stationary contact assembly plates.
1I
Figure 5 is an elevation ‘viewof the opposite
side oi' the plate shown in Figure 4.'
Figure 6 is a side elevation view of my inven
tion.
likelihood that the back plate might be pushed
It is an object of my invention to provide a unit
type flush snap switch with a casing which has
:o
invention with the section taken on line 1_4 of
Figure 'ï is an end elevation view oi' my inven- go
20 away from the casing or might be loosened sum
25
v
- Figure 3 is a transverse section view oi’ my
was exerted upon the switch handle there was
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..
Figure ilA is a longitudinal~ section view of my
invention with the section taken on line 2--2'01
upon a supporting bridge of length just suiiicient
to bridge across the opening of a single gang
10 switch box. Heretofore switches of this type
have had their mechanism inserted in the switch
casing from the rear, and the mechanism has
been held in place by a iibre or metal back plate
which in turn is held by a metallic securing mem
15 ber engaging with the sides or _top of the casing.
These prior constructions have been disadvanta
geous for the reason that when undue pressure
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tacts in place but with the movable parts of the
i The switches are mounted usually in openings ` switch mechanism removed.
operation of the switch.
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‘of the switch casing’with the stationary con- g
switch box behind a single gang flush or wall plate.
contacts or other parts and of the switch mecha
nism and inthat way interfere with the proper`
.
Flgurel is a plan view looking into the interior
` 5 singly or in pairs or in threes in a single gang
ciently to permit undesirable movement of the
.
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tion.'
.
Referring to the drawing it will be noted that
the switch mechanism of my invention ishoused'
within a one-piece-hollow casing il oi’ insulating
material which has plane side walls Ils and a solid g5
back wall Nb, and end walls lle which are each
provided with lower and upper apertures for bind- i
ing screws of wire terminals I2a, l2b, |2c, and l2d. ,
In the side walls los adjacent the end walls there
are provided pairs of opposed slots I I and Il into 30
which may slide from the front of the casing sta_-
tionary contact assembly plates il, Il oi' insulat
« ing material such as nbre. "These assembly plates
,
I8, i9 are or may be substantially alike for each
end. The plate I8 has upper and lower metallic 35
the switch mechanism is held-in the casing by _ terminal plates 22 and 20 respectively, secured to
one face thereof, with terminal screws |2a> and I2b
engagement of the cover therewith.
Another object of 'my invention is to provide a respectively screwed therein. Mounted on the
insulating plate I8 are spaced stationary contacts
snap switch of the above type with a switch mech
40 anism that may quickly and easilybe assembled 24 and 26 of U-shape with lateral extensions from 40
their arms passing through the insulating plate Il
in the casing by insertion from the front.
Another object of my invention is to provide a adjacent the top corners and into and through
extensions or branches of the terminal. plates 2l
switch of the above type in which the switch mech
anism and contacts are insertable in the front and 22 respectively. To secure these contacts to
45 and are held in position by the engagement of their-respective terminal plates the ends of their 45
Another object oi my invention is to provide a
35 snap switch of the above mentioned type in which
the cover which in addition to its function of se
curing the switch parts in position also shields
them from any metallic or current carrying party
at the front of the switch.
.
extensions may be peened over.
The stationary `
contact assembly plate I9, although of similar
construction to the assembly I8, has the sta
tionary contacts 28 and It at the bottom of the
Another object of my invention is to- provide a ' plate instead of at the top in order that the blades 50
snap switch of the above type in which the cover of the mutually insulated movable contact mein
automatically secures itself to the base when the bers 32, 34 may engage with contacts 26, 30, and
24, 28 respectively in closed circuit position loi! the
cover is seated in its assembled position.
Other objects and advantages of my invention
55 will become apparent to those skilled in the art i -These movable bridging contact members 32. 55
50
switch.
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2,117,171
34 may be made up from thin sheet metal stamp
therefore I do not nmit myself to the specific
ings so as to possess resilience and engage the
iorm oi the'invention as- disclosed in the accom
stationary contacts with spring pressure. These
movable bridging. contacts are mounted upon
lateral ~outward extensions "e from the arms of a
-panying drawing.
‘
1. In a snap switch, an insulating casing, hav- `
U-shaped switching member ll which may be ing integral bottom and side walls,'a swinging
1 oscillated by a switch spring, 38 one end of which U-shaped switching member, a pair of parallel
is engaged with the transverse portion oi' the ' plate-like formations of insulating material ex
switching member while the other end is engaged tending up from said bottom wall and providing
with a manually movable lever Il oi shape as
shown in Fig. 2, which is pivotally mounted upon a
transverse pin 42 passing through >the cover 44
bearings for the ends oi' the legs of said switch
ing member and supporting said switch member
in inverted position. a cover for said casing, an
for the switch casing.
operating member pivotally mounted in said cov
'This cover may be made of insulating material
er and extending therethrough, and snapping
mechanism between the legs of said switch mem 16
ber for actuating said switching membei.
and may have a portion “a iitting within the top
:of the switch casing Il to completely close the
upper end of the casing except for an aperture pro
vided for the insulating handle Il of the manually
2. In a snap switch', an insulating casing hav- .
ing integral bottom and side walls, stationary
switch contacts at opposite ends of said casing
movable lever lll. This handle and the cover
form a completely closed front for the switch to
prevent access oi any tool through the cover to
having wire terminals with screws extending into «
'said casing, a swinging switching member, a pair
' the switch mechanism or current carrying parts. of parallel plate-like formations of insulating ma
'I'hus the cover and handle provide a "dead” terial extending up from said bottom wall and
iront for the switch. The cover also has a cen
having V-notch bearings for said switching mem
tral upstanding rectangular neck 44h which is‘ ber, the edges of said formation being spaced
adapted to iit` in a complementary aperture in a from the ends of said casing to provide roomiîorV
conventional ilush or wall plate (not shown) .Y
said screws, a cover for said casing, an operating
For rockably supporting the switching member
member pivotally mounted in said cover and ex
36, there are formed in the bottom of the switch tending therethrough, and snapping mechanism
casing a pair of parallel platelike hearing mem
for actuating said switching member.
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bers 5U which are provided with V notches 52
3. In a snap switch, an insulating casing hav
into which the legs of the switching member bear. ing integral bottom and side walls, ‘a‘ pair of
By reference to the drawing it will be noted spaced plate-like insulating members parallel
that the lower end of the actuating lever 40 to one side wall, a swinging U-shaped 'switching
moves in the lower Dart of the switch casing. It member supported in inverted position by the
may now be observed that by movement oi'the ends of its legs engaging in notches in said plate
switch handle 4i and the actuating lever 40 like members, an insulating cover i'or said cas
about the pivot 42 of the handle-and lever, the _ ing, snapping mechanism for actuating said con
line of action of the switch spring 38 will be tacts,- and insulated operating means pivotally
40 carried through the piane of the switching mem
mounted in said cover and having :a portion mov
ber 36 and thereby cause movement of lthe switch
ing below said switching member, ïsaid cover and
ing. member from one side of its V notch bear ’ operating means forming a "dead‘r’ front for the
, ings to the other, and corresponding movement
oi the movable switch contacts with a snap ac
4. In a snap switch, an insulating >casing with
tion.
=
integral- back and side walls, a cover fitting vwith
One of the novel features of my invention is in the. front oi said casing, operating mîeans piv
the means ior securing the cover to the switch otally mounted in -said cover, notched bearing
casing. 'I'his means will now be described. In members integrally formed with the bottom of
the side walls ills oi _the switch casing adjacent said casing, a U-shaped swinging switching mem
i the top thereof and centrally positioned are co
ber supported by said bearings in inverted posi
axial apertures ,54 vwhich are adapted toreceive tion by the ends- of its legs engaging in Asaid bear
coaxial lugs 56 formed integrally and extending ings, and a spring connected to said operating»
laterally from the sides of the cover M. These means and said switching member, the travel of
lugs or extensions may be- substantially circular said switching member under the iniiuence of
55 but beveled downwardly as illustrated in Figure 3. said spring being limited by its legs abutting the
When applying the cover to the casing there is sides of said bearing notches.
suflicient resiliency of the walls- its to permit the
A5. In a snap switch, an insulating casinglhav- '
beveled surfaces of the projections to act as ing integral back and side walls, a cover iitting
wedges to force the walls apart until the lugs are within the iront of said casing, switching mech
seated in the apertures il. Thus upon applying - anism' within said casing, an «iper-ating member
the cover to 'the casing. the cover will snap into
placeA and be maintainedïthere permanently or
of said switching mechanism extending through
' until special tools are used to'. permit the remov
said cover, notched bearing members formed in
tegrally with the bottom of said casing. and a
. al »oi the cover.
AU-shaped switching member of' said switching
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-. I have found that insulating materiels suen es mechanism supported by said bearing members,
condensation products of phenols and formalde-- _the travel of said switching member'under the
hyde,~ and phenolic resins, although‘substantially inñuence ot said spring being limited by its legs
rigid for most purposes
~suiiicient resil
abutting the sides o! said bearing. notches,- the
iency4 for use in making the cover and the casing edgesV of said bearing member being spaced from
of my invention. Obviously any other insulating the ends of the casing to 4provide room. for ter
material
u l t . »cui
l 1
-
_characteristics
be used for making .the-casing
invention.
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V-
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could
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screws extending in i'rom the .ends of said
andcoverof my 4casing
6. In'a snap
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_Many modiiications within the _scope oi my in
751 vention will .occur to those. skilled in the' art,
an »insulating casing hav
ing integral bottom and side walls, stationary
switchcontacts at .opposte ends of said casing
70.
9,117371
in the front of said casing, operating means piv
having wire terminals with screws extending into
said casing. a swinsinil switching member,V a pair
oi parallel plate-like formations of insulating
extending therethrough. snapping mechanism for
said casing. a >U-sl'iaped swiniiing switchinß
member supported by said bearings in inverted
position by the ends o! its legs engaging in said
bearings, a spring connected to said operating
means and said switching member, the travel oi
said switching member under the influence oi
said springs being limited by its legs abutting _the
actuating said switching member, and means on
said cover and casing to automatically lock said
casing and cover together when said cover is in
ing and cover together when said cover is in
material extending up from said bottom wall and
V.having V`-'notch bearings for saidv switching mem
5 ber, the edges of said formation being spaced
from the ends of said casing to provide room tor
said screws, a cover tor said casing, an operating
member pivotally mounted in , said cover and
10
otaiiy mounted in said cover. notched bearing
members integrally formed with the bottom oi
serted in the front of said casing.
7. In a snap switch. an insulating casing with
integral back and side walls, a cover ntting with
sides of said bearing notches, and means on said
cover and casing to automatically lock said cas- _
serted in tlm iront oi said casing.
GEORGE A. JOHNSON.
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