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Патент USA US2125684

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Aug. 2,- 1938.
R. A.' MILLERMASTER
2,125,64
‘ELECTRIC SWITCH
Original Filed July 10, 1936
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' 2 Sheets-Sheet I
R. A. MILLERMASTEQ
‘ 2,125,684
ELECTRIC SWITCH
Original Filed July‘ 10, 1936
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2 Sheets-Shem. 2
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Patented Ann. 2, i938
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hlthi?'li‘hl? h‘llt'i'iilh
Match All. ltiilllermaster, lliillwanhee, Win, asslgnor
to hotter-Hammer, line, lliiilwauhee, Wis, a cor
notation of heiaware
original anpiication .lniy no, rose, Shi'l'ldil No.
cases, now Patent No. httih'llit, dated hugnst
2i,-li9tt'. lhivided and this application .lnly 2t,
(ill. WM?)
ll iliainis.
This invention relates to improvements in elect
tric switches, and the invention relates more par
ticularly to electric safety switches oi the snap
his. 51s a fragmentary elevational view, as seen
‘from the right-hand side of the device in Fig. i.
Fla‘. ii is a fragmentary elevational view oi‘ cer-y
hn' object of the invention is to generally im- '
type.
it
ing losing oniitted,-—and certain of the parts heing
hrolren away or in section.
‘
' prove the details of construction and the opera- ' tain oi the switch parts, as seen from the oppo
tion of switches of the aforementioned character.
another object is to provide an arc snu?er'
which is particularly well adapted for use with a
site side of the casing wall in Fig. 5, and
_
Fig. 'i is a side elevational view, on a reduced
‘scale, oi one of the duplicate insulating arc snu?
ing elements, showing the term oi the recess walls,
m switch of the free-end, knife-‘blade type.
which are shown in section in Fig. i.
Another object is to provide improved and sini
Referring to the drawings, the numeral it
pli?edmeans for effecting snap operation of the‘
_ switch to open-circuit or closed-circuit position of
the parts.
.
w _ Another object is to provide an improved tor-in
of operating handle and handle attachingmeans
tor switches of the aforementioned character.
Uther objects and advantages oi’ the invention
2@
will hereinafter appear.
‘
This application is a division’ oi’ my copencling
application, Serial lilo. tilttt, ?ied July it), with,
for improvement in Electric switches, which has
resultedjln Patent iiio. Eilhilflii'i', elated. ring. it,
1937.
-
25
rl‘he,‘accompanying drawings illustrate a pre
ferred embodiment of the invention which will
now he described, ‘it being understood that the
embodiment illustrated is susceptible of modifi
“ cation in respect of certain structural details
‘1%’ thereof without departing from the scope oi the
appended claims.
n
designates a hose molded irons a suitable insulat
ing material to the form illustrated in Figs. 1 and
Base it when positioned within the sheet 15
metal housing ii is rigidly attached to the hottom
wall iia oi the latter, as toy means of three holts
each designated by the numeral it. The switch
herein illustrated is of the denials-hole type,--hut
it is to he understood that my invention is appli
cable to switches having any desired nnn'lher of
poles. Ease it is provided on its upper surface
adjacent to one end thereof with a pair oi’ metal
hiocks or plates it oi’ approximately L-shape
which are attached thereto icy holts iii (Fig. i)
and it) (Figs. 1 and 4). Each bolt it with its
not lie (Fig. i) likewise provides for attachment
oi the post or support it which pivotally carries
one end. of a hnifcuhlade contactor it’. ‘Each
bolt it with its nut lie likewise provides for at»
ll
tachment of a tuhular soldering terminal element ‘
,
in the drawings, Figure l is a top plan view,
hali~size, of an enclosed or safety switch at the
snap type-the hinged cover of the sheet metal
‘W casing of the switch being shown tragmentarily
in open position,--and a portion of the side wall
of the casing which carries the cover latch ‘being
iii ot'well known iorin.
‘
Each contactor' ll preferably has attached to
opposite sides thereof, by rivets i ii, a pair oi rela
tively thin ?at insulating plates it of lilreform. 35
"the projecting lower ends of said plates 2t are -
adapted to engage the rih it“ formed upon the
upper
surface of base it to limit the circuit clo‘s-‘
hrolren away.
~
.
Fig. 2 is a fragmentary vertical sectional view, ing movement of the contactors (see Fig. ll).
"W slightly greater than normal size, on the line Plates it are provided with slots or notches open Aid
. 2-412 of Fig. 1, showing in detail the interlocking. ing in a direction away from the point of pivotal,
connections between the insulating‘ are snuiier support of the contactor, as shown at tilein Fig.
elements and the stationery contact clip, and
illustrating‘ the relative positions of the parts
iii-it
when the switch blade is in circuit closing posi
tion.
-
'
Fig. 3 is a fragmentary vertical sectional view,
on the line i-_-t oiFlg. l,--certain or" the parts
ooloeing shown in-elevation,
,
'
i. ‘ Said notches are adapted to accommodate
the crank portion of a switch actuating element
it, said crank portion preferably having tele-' 45
scoped thereonto prior to bending of element it
an insulating tube it torproperly insulate said
element from the contactors.
'
Arrangedin spaced’ relation to the pivot posts
it are a pair oi one-piece resilient sheet metal 50
-
@Fig. 3a is a fragmentary elevational view of ‘ contacts it oi identical form, as shown in sec~
certain of the parts, looking in the direction of
tion in Fig. 2 and in dotted lines in Fig. i. Con-o‘ "
the arrows 35-3“ of Fig. 3.
tacts- it are of constricted U-shape in vertical "
r
‘
-
Fig. 4 is a side elevational view of certain of
55‘ the switch parts shown in Fig. l,—the switch cas
cross section, (Fig. 2),,the arms it“, it‘) being
biased toward each other and the upper ends 55
2
2,126,684 v
thereof being ?ared as shown at 23¢, 234 to facili
tate insertion of the contactors I‘! therebetween.
Partly sheared and bent outwardly and upwardly
from the arms of each contact." at the enlarged
lower end portion of the latter are a pair of sub
stantially horizontal tongues 23'’ and 23‘. ,Each
contact 23 is rigidly secured to base III as by
means of a bolt 24 the threaded shank of which »
extends upwardly through a passage in base Hi,
10 penetrates an opening provided in the base por
tion of the contact, and takes into a tapped open
ing in a metal plate 25. Plate,“ is further at
tached to base In by a bolt 26 the shank of which
threads into a second tapped opening in said
15 plate. Said shank extends upwardly a su?icient
distance to penetrate a clearance opening pro
vided in the tubular soldering terminal element 21
of well known form,—a nut 215ll cooperating with
said shank to clamp terminal 21 in fixed position.
To‘ minimize arcing between each contact 23
20
and its cooperating contactor l1, and to thereby
increase the life, the current controlling capacity
so
28“ of the latter will be spread apart against
the bias of member 29, and upon continued cir
cuit closing movement of contactor l‘l the mem
bers 28 will assume the positions thereof shown
in Figs. 1 and 2. That'is to say, the forward
edges of said members will be spread apart to the
required degree to accommodate contactor l1
whereas the rear edges thereof will be biased
into engagement-with each other. As herein
after described, I preferably provide means for 10
effecting movement of contactors H to opposite
extreme positions thereof with a snap action, and
the are snui?ng members 28 and members 29 are
so constructed and arranged as. to add only a
negligible amount of resistance to such move 15
ments of the contactors.
.
-
The switch actuating mechanism‘ is preferably
so constructed that in the event of breakage or
disablement of the snap action spring, the con
tactors ll maybe moved to open-circuit posi 20
tion by manual operation of the switch handle,
but in such event the contactors l1 may not be
and the safety characteristics’ of the switch as
moved to circuit-closing position pending repair
a whole, I provide for each contact 23 an arc
or replacement of the snap action spring. It is
to be understood that the snap‘action mecha 25
nism is adapted to become effective upon the con
snu?lng device designated in general by the nu
meral 28. Each of said devices comprises a pair
of members 288‘ of identical form which are pref
erably molded from a suitable heat-resisting in
sulating material. The adjacent faces of mem
bers 28*‘- are complementaliy recessed, as shown
in Figs. 2 and 7 to jointly accommodate all parts
of the stationary contact 23 associated there~
with,-the arrangement being such that in the
open circuit position of contactor I? the adja
35 cent faces of members 28* may be brought into
engagement with each other to completely en
close the contact 23. Members 28“ are normally
biased toward each other by a substantially U—
tactors ill just prior to disengagement of the
latter from the stationary contacts, wherefore
the subsequent rapid movement of said con
tactors between the relatively large ?at surfaces 30
281 on members 28 will tend to cool and extin
guish any arcs formed incident to separation of
the contactors from the contacts. Moreover,
when in the circuit interrupting movement of
contactor-s ii the same are disengaged from
members 28 the entire adjacent ?at faces of the
latter will be snapped into engagement with each
shaped resilient metal clip 29 the respective
other, under the vbias' of the respective members
29, thus completely enclosing the contacts 23
40 arms of which seat in grooves 28“ of correspond“
with which they are associated to further assist
in and insure quenching or snu?ing of any arcs
ing shape upon the outer surfaces of the respective
members 28* between the upperand lower ends
of the latter.
The free ‘ends of the arms of
member 29'are ?ared, as shown-at 25”- in Fig. .4,
to facilitate insertion thereof into said grooves.
'
Members 2i!IL are likewise preferably provided
at the forward and rear sides thereof with com
plementary recesses 28° and 28“, any pair of
which are adapted to accommodate at least parts
of the connecting portion 29b of member 28 (see
Fig. 4). Each arm of member 2! is preferably
provided with an inwardly extending hemi
spherical boss or projection, and each groove It"
' is provided with a pairv of hemispherical depres
sions, located at corresponding distances from
the respective ends thereof ‘to selectively ac
commodate said bosses, whereby accidental sep
aration of clip 29 from members 28* is prevented.
One of said depressions is shown in dotted lines
at 28° in Fig. 4. As will be understood, the mem
ber 29 is so assembled with respect to the mem
bers 28' that the connecting portion 29b is at the
" end of, said members which is remote from the
so forrried.
-
The switch herein described and illustrated’
has a rating'of 100 amperes at 575 volts A. C.
It if it desired to provide a switch of substan
tially lower rating or current controlling ca
pacity, the arc snu?ing devices, including mem
bers 28 and29 may be entirely omitted without
in anywise affecting the construction or assembly
of the other switch parts. Moreover, the arc
snu?ing devices may be readily removed to per
mit inspection, repair or replacement of the re
spective contacts by merely manually withdraw
ing the members 29, whereupon the members 28
are free to be removed laterally from their asso 65
ciated contacts. Or the member 29 of each arc
snumng device may be permitted to remain in
position and the forward edges of members 28
may be spread apart manually to effectv disen
gagement of the lower walls of auxiliary recesses
20x from the tongue 23°, 23!, whereupon the com
plete arc snuf?ng device may be lifted vertically
out of interlocking engagement with its contact
pivot point of contactor IT. The members 28!, ' 23. The reverse of this procedure may, of course,
however, may be" reversed with respect to con
' tact 23 and with respect to clip, 2|.-v
The members 28' of the arc'snuflinz device are
' restrained against substantial sliding movement
relatively to contact 23‘ and with respect to each
70 other as by means of the auxiliary recesses”!
which accommodate with a loose fit the afore
1 mentioned horizontal tongues 2v; 2:1 (Fig. 2).,
The arrangement is such that upon initial en
gagement of each contactor H with the beveled‘
be followed in assembling the arc snu?ing devices 65
with respect to their associated contacts.
The switch operating mechanism includes a
hub member 30 having a relatively large circular
end portion 30“ one flat face of which is adapted
to bear against the adjacent ?at face of a 70
punched and stamped sheet metal member 3!,
the other face of the latter being adapted to bear
against the inner surface of the side wall Nb of
the switch casing (Fig. 3). Member 3! is pro
75 edges 28'. 28" of members 22 the upper ends _ vided with an opening 3i‘, the form of which is 75
. silenced
illustrated in Fig. 3a.‘ "I'hemain portionof the
‘peripheral wall of opening Si‘ is in .the form of
an arc of a circle, to provide a bearing forthe
3 .
33“
d 40“ are respectively provided with per
iorati ns shown, respectively, in dotted lines at
arc-shaped peripheral edge of the reduced por
tion 3t!” of theihub member: " Saidportion 30b
38” and M1” in Fig. 5; and ?ange GM5 is provided
‘is also provided with am?at' edge'30°, “and the
opening (Ha is provided with a pair of‘?a?t, wall
portions 3th, 3i arranged vat a predetermined
angle to each 01;
.
of a bracket membeMiPwhich is rigidly attached
to wall It”, as by means of rivets ti. The lugs
with a perforation 3t” and a notch vtitd (see Figs.
3 and 5), which are selectively registerable with
the aforementionedlug openings 38'’, ?itb to pro
r. By this means a predeter
vide for insertion of the vhasp of va padlock of
mined degree of lost motion is provided between suitable
form, whereby the switch may be locked 10
hub member 30 and member 3!’. Member 3| is‘ in open-circuit
or closed-circuit position.
provided with integral portions 13| e, 3!‘ which are
As best shown in Fig. 3, the handle portion
' slightly oifsetfrom the main body thereof (Figs.
335 is provided‘ with an opening to a?ord clear
ance for the still further reduced and threaded
end portion 30“ of the‘hub member, a nut 42 15
3. and 3a) to minimize friction between said mem
ber and the inner surface of casing. wall it”. The
portion Me is provided with an integral lug 3ig
being engaged with portion till! to clamp the
aforedescribed parts in assembled relation. Por
\which is bent inwardly at substantially a right
angle with respect to said casing wall, and the
tion 38'! is preferably provided with one or more
portion 3i! is similarly provided with an integral
lug ii“. The lugs tit, ti“ are spaced a predeter
mined distance apart and in overlapping rela
Fionship to one arm of crank member 2i, as best
drilled passages (seeFigs. 3 and 3a) extending
diametrically therethrough adjacent to the outer 20
end thereof, and nut M is provided with a. plu
rality of kerfs extending from the outer end
thereof to provide for insertion of a cotter pin
433, in the manner illustrated in Figs. 3 and 5,
llustrated in Fig. 1,-—to provide a predetermined
degree of lost motion between member 3! and
‘ said crank: member. Casing wall lib is pro
whereby loosening of‘ nut M is positively pre
videdgwith a 'circular opening "lid (Fig; 3) rand . vented.
25
ll/prefer to position within said'opening'in ~bear- 7 -To limit ' the degree of circuit-interrupting
ing relationship to the wall thereof a circular movement of contactors it’, I prefer to pro
washer (i2,—said washer being of slightly greater
vide a stud M projecting inwardly from the V
30 thickness than wall it”, for a purpose to be
described.
"
"
Hub member 30 is provided with a. further '
reduced portion 30d of the contour best illus
trated in’Fig. 3a,-the same having parallel ?at
35 sides We and 30‘. Washer 32 is provided with
an opening of a shape corresponding to the
cross sectional-contour of portion 30d, whereby
these parts are constrained to rotate with each
other.
40
~
'
ner: A stamped sheet metal member having a
[contour is adapted to seat against the outer sur
face of washer 32 (Fig. 3), and said portion is
provided with an opening to non-rotatably ac
commodate the portion 30“ of the hub member.
The handle 33 is provided with a portion 33“
of inverted channel-shape which overlies said
50 body portion 34 in the relationship best illus
trated in Fig. 5,—it being understood that the
longitudinal center line of handle 33 is parallel
with the ?at sides db” and 30’ of hub portion
3W1. Interposed between handle portion 33“ and
body portion 34 is a. pair of spaced metal mem
bars 35 and 36, all of said elements being rigidly
attached to each other, as by means of four rivets
til, the tapered heads of which (not shown) are
positioned in counterslnks in the surface of por
60
30v
opening provided in wall Nb and a washer t5
and is upset over the latter, as shown in Figs.
1 and 5.
'
‘
.
35
Referring to Figs. '1, 3a and 6, it will be noted
that the portion die of member iii is provided I
with an integral offset lug 3B‘ which is provided
with an opening to register with openings pro
The operating handle 33 is non-'rotatably at-, vided in the enlarged and shouldered ends of
di)
tached to hub member dd in the following man
main body portion 3d of substantially circular
45
casing wallv H” to be engaged by the right-hand
‘arm of crank member iii (see Figs. 1 and 6).
The reduced and Me of stud (it penetrates an
tion tit adjacent to casing wall ii”.
Formed integrally with the portion 3t and sur
rounding the major portion of the periphery
‘ thereof is a ?ange Me. Also formed integrally
with portion M is a projection or lug iidb’which
65 is angled away from casing wall it? to a slight
degree, as shown in Fig. l. The shoulder pro
vided at one end of projection 34th is adapted
I to abut against the edge of a' right-angled lug
tile forming part of a bracket member‘ M which
70 is rigidly attached to wall i lb, as by means of
rivets 39 (see Fig. 5), to positively limit the
degree of rotary'movement of handle it in one
direction.v The shoulder provided at the other
end of projection 34‘) is adapted to abut‘ against
75 the edge of a righteangied lug 40" forming part‘
a pair of metal members fit and 4W arranged
on opposite sides thereof,—a headed rivet #8
being inserted through said openings-and upset
as shown to provide a pivotal connection bee
tween said parts‘. Members at and M are off 45
set into engagement with each other throughout
the major ‘portion of the length thereof from a
point adjacent to the pivot end thereof,—the 7
free ends of said members being reciprocable
through an opening provided in the lug the form 50
ing a- part of bracket M which is attached to
casing wall lib as by means of rivets 5i). Lug
tan is formed to provide a pair of surfaces angled
toward each other to provide a sort of knife
edge bearing for one end of a coiled compres
sion spring 5|! which surrounds members 46 and
ti'i,-the other end of said spring being engaged
55
with the aforementioned shoulders vat the en- _
larged ends of members ‘it and M.
“A latch member 52 is pivotally supported in
spaced relation to casing wall it“, as by means
of pin 53 (Fig. 6),-—a bracket M being attached
to said wall, as by means of rivets 55. The hori
zontal portion M“ of said bracket has an opening
to provide clearance for latch 52 and to insure 65
proper alinement thereof with an opening or slot
(not shown) provided in the casing cover Me.
Member 52 is provided on the portion 5?!“ there
of with an abutment to accommodate and retain
one end of a coiled compression spring-the 70
other end of which engages a boss or abutment
formed upon the lower face of the horizontal por
tion 5d“ of said bracket. Latch 52 is also pref
erably provided with an opening 52'’ to accom
modate the has'p of a suitable padlock, to pro M
4
' 2,125,684
vide for locking cover He in closed position, or to‘
prevent complete closure thereof, if desired.
‘The handle 33 vwhich is formed of sheet metal
has the grip portion 33" thereof drawn or swaged
V tothe hollow form illustrated, and in a manner
‘to avoid exposure of any out edges;
It is thought that the operation of the snap
switch mechanism will be obvious from the fore
going description. It may be pointed out, how
10 ever, that with the various parts in the respec
tive closed-circuit positions shown in Figs. 1
portion extending through said opening, and a
nut engaging said threaded end and having
clamping engagement with said handle portion
to retain the latter and‘ said hub member inv
assembled relation to said casing.
l
2. In an electric safety switch, in combination,
a sheet metal casing having an openable cover,
a metal bracket secured to the inner surface of
one side wall of said casing, said bracket hav
ing a pivot opening formed therein, a crank 10
member having one end thereof pivotally sup
and 5, upon initial downward movement of han- , ported within said bracket opening, the opposite
dle 33, the lost motion between the hub member
_ 30 and member I“ is ?rst taken up.
That is to ‘
15 say (see Fig. 3c), the hub 30 is permitted to
move rather freelyuntil the ?at edge 30° of hub
' portion 30“ engages the ?at wall portion 3“) of
opening 3!“. Thereupon member 3! rotates along
with hub member 30 to e?ect compression of
20 spring 5!.
Before the toggle (represented by
the pivot pin 48) reaches dead center the lug
ll‘ (Figs. 1 and 6) will engage the right-hand
arm of crank .member H to positively initiate
disengagement of contactors H from their asso
ciated stationary contacts 23. As heretofore
pointed out, said contactors ll may be disengaged
by the operating means independently of spring
5|,but under normal conditions spring 5! will
become effective prior to complete disengagement
of said contactors to effect snap movement there
of to circuit interrupting position. Such move
ment of contactors i1 is limited by engagement
of crank member 2| with stop pin 44, as afore
described. .The are snu?ing devices will act in
the manner aforedescribed to minimize the de-'
gree of ‘arc ‘formation and to e?ectually extin
guish or snuff any arcs formed incident to the
operation. »
'
What I claim as new and desire to secure by
40 Letters Patent is:
1. In an electric safety switch, in combination,
a sheet metal casing having‘ an openable cover,
a metal bracket secured to the inner surface of
one side wall of said casing, said bracket hav
45 ing a pivot opening formed therein, a crank
member having one end thereof pivotally sup
ported within said bracket opening, the opposite
side wall of said casing having a relativelyllarge
opening formed‘ therein in alinement with said
bracket opening, an annular washer adapted to
bear within said last mentioned opening, a ‘hub
member having a relatively large end portion 10
cated within said casing, said end portion having
a recess adapted to provide a bearing for the
other end of said crank member, a switch actu 20
ating element having a portion thereof interposed
between said-hub end and the last mentioned side
wall of the casing, said element and said hub
member being ‘cooperatively formed to provide
a predetermined degree of lost motion therebe
tween, said element having spaced lugs-formed
integrally therewith to provide a predetermined
25
degree of lost motion between the same and
said crank member, said hub member having a
portion of non-circular cross section projecting 30
from said casingpa stamped sheet metal mem
ber having an opening therein corresponding in
shape to said last mentioned hub portion to pro
vide' a positive driving connection .therebetween,
a sheet metal handle member having a portion 35
of inverted channel-shape superimposed upon
said stamped sheet metal member andlrigidly at
tached thereto, said portion of the handle mem
ber having anfopening formed therein, said hub
member having a reduced and threaded end por 40
tion extending through saidvopening, a nut en
gaging said threaded end and having clamping
engagement with said handle portion to retain
the latter and said hub member in assembled
relation to said casing, said threaded end hav 45
ing a diametrical passage formed therein, said
nut having a plurality of slots formed therein
to selectively register ‘with said passage, and a
side wall of said casing having a relatively large cotter pin cooperating with saidslotsand said
opening formed therein in alinement with said passage to‘ restrain said nut against separation
50 bracket opening, a washer adapted to bear with . from said hub member.
in said last mentioned opening, a hub member
3. In an electric safety switch, in combination,
having a. relatively large end portion located. a sheet metal casing having an openable cover,
within said casing, said end portion having a re
a‘metal bracket secured to the inner surface of
cess adapted to provide a bearing for the other one side wall of said casing, said bracket hav
ing a pivot opening formed therein, a crank mem
55 end of said crank member, a switch actuating
element having a portion thereof interposed be? ber having one end thereof pivotally supported
tween said hub end and. the last mentioned --within said bracket opening, the opposite side
side wall of the casing, said element and said wall of said casing having a relatively large open
hub member being cooperatively formed to pro
ing formed therein in alinement with said brack
60 vide a predetermined degree of lost motion there
et opening, a washer adapted to bear within said
between, said element having spaced lugs formed last mentioned opening, a hub member having
integrally therewith to provide a predetermined a relatively large end portion located within said
degree of lost motion between the same and said casing, said end portion having a recess adapted
crank‘ member, said hub member having a por
to provide a bearing for the other end of said
tion of non-circular cross section projecting crank member, a switch actuating element hav
from said casing, a stamped sheet metal mem
ing a portion thereof interposed between said
ber having an opening therein corresponding in hub end and the last mentioned side wall of‘
shape to said last mentioned hub portion to pro
the casing, said element and said hub member
vide a positive driving connection therebetween, being cooperatively formed to provide a predeter
70
70 a sheet metal handle member having a portion mined degree of lost motion therebetween, said
of inverted channel-shape superimposed upon element having spaced lugs formed integrally
said stamped sheet metal member and rigidly therewith to provide a predetermined degree of
attached thereto, said portion of the handle lost motion between the same and said crank
member having an opening formed therein, said member,
said hub member having a portion of 75
75 hub member having a reduced and threaded end
aiaaesa.
‘ non-circular cross section projecting from
said '
casing, a stamped sheet metal member having
an opening therein corresponding in shape to said
,last mentioned hub portion to provide a positive
5 driving connection therebetween, a sheet metal
handle member having a portion of inverted
channel-shape superimposed upon said stamped
sheetrnetal member and,rigidly attached thereto,
said portion of the handle member having an
10 opening formed therein, said hubrnember hav
ing a reduced and threaded end portion extend
ing through said opening, a nut engaging said
threaded end and having clamping engagement
with said handle portion to retain the latter
15 and said hub member in assembled relation "to
said casing, said switch actuating element hav
ing a lug formed integrally therewith and ‘located
in'a plane parallel to and offset from the main
body thereof, a pair of sheet metal rods pivotally
20 attached at one end thereof to said lug, said
rods having shoulders formed thereon adjacent
to the pivot point thereof, a bracket member se
v cured to said'casing wall and having’ an opening
to receive and guide said rods, and a coiled com
25 pression spring interposed between said bracket
bear within said last‘ mentioned opening, a hub
member having a relatively large end portion
located within said casing, said end portion hav
ing a recess adapted to provide a bearing for the
other end of said crank member, a switch ac
tuating element having ‘a portion thereof inter
posed between'said hub end and the last men
tioned side wall of the casing, said element and
said hub member being cooperatively formed to
provide‘ a‘ predetermined degree of lost motion
therebetween, said element having spaced lugs
i’ormed integrally therewith to provide a prede
termined degree of lost motion between the same
andsaid crank member, said hub member hav
ing a portion of non~circular cross section pro
jecting from said casing, a stamped sheet metal 15
member‘having an opening therein correspond
ing in shape to said last mentioned hub portion
to provide a positive driving connection therebe
tween, said stamped sheet metal member having 20
an extension formed integrally therewith and
adapted to provide a pair of spaced substantially
radial shoulders arranged at a slight angle to
the outer surface of said casing wall, a pair of
lug members rigidly attached to said outer sur 25
and said shoulders to insure snap movement of face of the casing wall and respectively adapted
said element to each of its extreme" positions.
for engagement by said shoulders to positively
4. In an electric safety switch, in combination, ‘ limit movement of said member in opposite di
a sheet metal casing having an openable cover, rections, ‘said lug members having openings
30 a metal bracket secured to the'inner surface of
formed therein, said member having an upstand
one side wall of said casing, said bracket having ing ?ange formed integrally therewith between 30
a pivot opening formed therein, a crank mem- '
her having one end thereof pivotally supported
within said bracket opening, the opposite side
35 Wall of said casing having a -relatively large
' opening-formed therein in alinement with said
said shoulders, and said ?ange having openings
formed therein» forMcooperation with said lug
openings to provide for attachment of a padlock
or the like.
,
‘
6. In an electric safety switch, in combination,
a metal‘ enclosing casing, a crank member piv
otally supported within said casing, said casing
bracket opening, a washer adapted to bear with
in said last mentioned opening, a hub member
having a relatively large end portion located having a circular opening formed in one side
'40 within said casing, said‘ end portion having a wall
thereof, a metal member of circular contour
recess adapted to provide a bearing for the other adapted
to bear within said opening, a hub
end of said crank member, a switch actuating member having a relatively large end portion
element having a portion thereof interposed be
located within said casing ‘and an intermediate
tween said hub end and the last mentioned side - portion of non-circular cross section adapted to
45 wall of the casing, said element and said hub
penetrate said metal member and projecting
‘member being cooperatively formed to provide a from said casing, a switch actuating element 45
predetermined ‘degree of lost motion therebe
tween, said element having spaced lugs ‘formed
integrally therewith to ‘provide a predetermined
50 degree of lost motion between the same and
said crank member, said hub member having a
portion of non-circular cross section projecting
from said casing, a stamped sheet metal member
having an opening therein corresponding in shape
55 to said last mentioned hub portion to provide
a positive driving connection therebetween, said
stamped sheet metal member having an exten
sion formed integrally therewith and adapted
to provide a pair of spaced substantially radial
60 shoulders arranged at a slight angle to the outer
surface of said casing wall, and a pair of lug
members rigidly attached to said outer surface
of the casing wall and respectively adapted for
engagement by said shoulders to positively limit
65 movement of said member in opposite directions.
5. In an electric safety switch, in combination,
a sheet metal casing having an openable cover,
a metal bracket secured to the inner surface of
one side wall of said casing, said bracket hav
70 ing a pivot opening formed therein, a crank
member having one end thereof pivotally sup
ported within said bracket opening, the opposite
side wall of said casing having a relatively large
opening formed ther'ein in alinement with said
75 bracket openingpan annular washer adapted to
having a portion thereof interposed between said
hub end and the inner surface of said side wall
of the casing, said element and said hub member
being cooperatively formed to provide a prede
termined degree of ‘lost motion therebetween,
‘said element having spaced lugs formedintegral
ly therewith to provide a predetermined degree
of lost motion between the same and said ‘crank
member, a stamped sheet metal member having
an opening therein corresponding in shape‘ to 55
said projecting hub portion to provide a positive
driving connection therebetween, a metal handle
member having a portion of inverted channel
shape superimposed upon said stamped sheet
metal member and rigidly attached thereto, said 60
portion of the handle member having" an open
ing formed therein, said hub member having a
reduced and threaded end portion extending
through said opening, and a nut engaging said
threaded end and having clamping engagement
with said handle portion to retain the latter and
said hub member in assembled relation to each
other.
>
7. In a snap make and break electric safety
switch, in combination, a metal enclosing cas
ing, a crank member pivotally supported within
said casing, one side wall of said casing having a
relatively large opening formed therein in aline
ment with the pivotal center of said crank mem
75
6
2,126,684,
‘ ber, a metal member of ‘circular contour adapted
to bear within said opening, a machined metal
hub member having a relatively large end por
tion located within said casing and an intermedi
ate portion of non-circular cross section adapted
thereof interposed between said hub ?ange and
the inner surface of said side wall of the casing,
said element and said hub having shoulders
formed thereon, to provide a predetermined de
gree of lost motion therebetween, said element
to penetrate said metal member and projecting
having a pair of angularly spaced lugs formed
same and said crank member, a stamped sheet
sheet metal member having an extension formedv
integrally therewith to 'provide a predetermined
from said casing, a switch actuating element hav
ing a portion thereof interposed between said , degree of lost motion between the. same and said
hub end and the inner surface of said side wall crank member, said hub member having a por
10 of the casing, said element and said projecting A‘ tion of non-circular cross section projecting from it
portion of the hub member being cooperatively said casing, a punched and stamped sheet metal
formed to provide a predetermined degree of lost member having an opening formed therein cor
motion therebetween, said element having spaced responding in shape to said last mentioned hub
portion to provide a ‘rigid and positive driving
lugs formed integrally therewith to provide a pre
connection therebetween, said last mentioned 15
determined
degree
‘of
lost
motion
between
the
15
‘ metal member having an opening therein corre
spending in shape to said projecting hub portion
to provide a positive driving connection therebe
20 tween, a metal handle member having a portion
of inverted channel-shape superimposedupon said
stamped sheet metal member and rigidly attached
thereto, said hub member having a reduced end
portion penetrating said, portion of the handle
25 member and projecting therebeyond, means as
sociated with said reduced end portion of the
hub member to retain said handle member in
assembled relation to the latter, said switch ac
tuating element having an additional lug formed
30 integrally therewith, a metal rod‘ member pivot
ally connected at one end thereof to said last
mentioned lug, said rod member-‘having shoulders
_ formed thereon adjacent to the pivot point there
of, a bracket member secured to said casing wall
35 and having an opening to receive and guide said
rod member, and a coiledcompressidn spring in
terposed between said bracket and said shoulders
to eifect snap movement of said element and said
crank member to the respective extreme posi
40
tions thereof.
»
8. In an electric safety switch of the snap ac
' tion type, in combination, a metal enclosing cas
ing‘, a bail-shaped crank member pivotally sup-_
ported within said casing, one side wall of said
45 casing having a relatively large circular opening
formed therein, a ?at metal member of corre
- sponding contour adapted to bear edgewise with— v
in said opening, a machined metal hub member
having a relatively large end ?ange located with
50 in said ‘casing, a punched and stamped sheet
metal switch actuating element having a portion
integrally therewith and adapted to provide a
pair of spaced angular shoulders, and a pair of
lug members rigidly attached to said casing wall
and-adapted for engagement by said shoulders
respectively to limit movement of said member
in-opposite directions.
,
9. In actuating means for ‘electric switches, in
combination, a metal enclosing casing having an
opening, formed in one side wall thereof, a ma
chined metal hub member penetrating said open
ing and having a relatively large end ?ange lo
cated within said housing, a bail-shaped crank
member one end of which is pivotally supported ‘
by said hub member, a. switch actuating element 80
having a portion thereof interposed between said
end ?ange of the hub member and said side wall,
said element and said hub being cooperatively
formed to provide a, predetermined degree of lost
motion therebetween, said elementhaving spaced
lugs formed integrally therewith to ‘provide a
predetermined degree of lostrnotion between the
same and said crankmember, said hub member
having a portion of non-circular cross section
projecting from said casing, a metal member hav
ing an opening therein corresponding in shape
to said last mentioned'hub portion to. provide a
rigid and positive driving connection therebe
tween, said lastmentioned metal member having‘
an extension formed integrally therewith to pro 45
vide. a'pair of, spaced angularly arranged shoul
ders, and meansncarried by said side wall of the
casing" to‘ be engaged'by‘said shoulders to posi
tively limit movement of said member in opposite
directions.
RALPH A. MIILERMAS'I'ER.
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