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Патент USA US2114512

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April~19, 1938.
Filed Apr-i1 15, 1957
1,1 16
PM Apr. 19, 193s
. 2.11am
' ~ " out Weacheha, 8t rm. m
am April 15, m1, we... 1:1,001
(Cl- 200-116)
contact with this plate through a'predetermined
winvention relates toantin’ movement
during which thethermostatic element
tact through a certain period of movement of a
movable member in one direction, and to break
5 contactthroughapredeterminedmovementof
, the movable memberintheoppositedirection.
It is the object of my invention to'provide a
10- in recurrent cycles. This switch readily adapts
is de?ecting in the opposite direction. The means
holding the switch am out of contact with the
contact plate also acts to hold the arm in contact 5
with the plate as it de?ects into extreme position,
thus. creating a snap action when the thermo- ‘
static element de?ects su?iciently. The thermo
static element may act either by a normal rise
and fallintemperature, ormaybe actuated bym'
itself for use in combination with a thermostatic a heating element connected in the circuit con
element for actuation of a circuit breaking means. ' trolled by theswitch arm. When arranged in
when thus arranged, my switch is operable for this latter manner, the switch arm closes the
15 operable in recurrent cycles is desired. For ex
ample, my switch may he'used #0 operate lighting
circuits which should be closed only-during a
certainperio'dofthedayto openthecircuitafter
~ a predetermined interval; My switch may
20 beusedforopeningthedrcuittoanyelectrically
operated device such as a refrigerator, in order
to provide a defrostingperiod during which the
at intervals.
same purpose‘or asimilar'pm-pose to that for
wllch the present switch is
. These for
mer constructions, however, usually have neces
wsitated the provision‘ of a constantly operated
motor which opensand closes a circuit at pre—
determined intervals. Thermostatic motors have
tion of a rotatable member. These motors, how
35 ever, have previously been relatively complicated
and have not been used for operation of a cir
ciuiilt breaker through_ _ an adjmtable period of
is de?ected beyond the means holding the switch
arm in contact with the contact plate. In this
point of the movement, the contact arm snaps
out of contact with the plate and remains out of
contact therewith during the return de?ection of 20
the thermostatic element as this element cools.
?ection, the switch arm again snaps into en
gagement with the contact plate again closing
the circuit to the heating element, whereupon the 25
25 cycles have been provided for accomplishing the
circuit to the heating element throughout its
de?ection in one direction until the switch arm 15
Itis apm'poseofthepresentinventiontopro
foregoing cycle is reputed.
- It is a feature of my invention to provide a
rotary element .used in conjunction‘ with the
switch arm‘ and operated thereby during the re
turn- de?ection of the thermostatic element. It
is obvious that the means holding the switch arm
used to hold the switch ~arm in cooperable rela
tionship with the rotary member during the
rotatable member a predetermined distance dur
ing each actuation of the thermostatic element.
It is a further feature of my invention that
thesnapactionswitchwhichlprovidemay be
used in conjunction with any movable operating 40
operated and which simultaneously operates a member in place of the thermostatic element and
will act in asimilarmannergtomaintain contact
rotatable member.which in turn actuates a re-'
currently operable circuit breaker. By this throughout a certain predetermined movement
4o vide a simple ‘switch which is thermostatically
means, a device for controlling a circuit may be
.45'recurrently actuatedbyadevleewhichisex
tremely simple and
to manufacture
oftheoperatingmembenandtobreakcontact at
a predetermined point of the movement of the 45
operating member in each direction.
It is a further feature of my invention to pro
andwhichcostsanextremelysmallamountto videacircuitbreakingmeansoperablebyaro-'
a circuitduringapre
Itisapurposeofmyinventiontoprovidea tatingmembertoclose
determineddistanceofrotation,andtoopenthe 50
ao’de?ectable thermostatic element which operates
aswitcharm. ,Thisswitcharrnisnormallyslid
circuit during the remaining portion of:the rota- -
ablyin contact with a suitable contact plate.
Upon extreme de?ection of the thermostatic ele
55 contact with the
tion. InthisdeviceIincorporateameansof
may be broken throinhout a longeror shorter
These and other objects and novel features of
my Invention will be more clearly and fully set
forth in the following speci?cation and claims.
In the drawing forming a part of myspeciilca
Figure '1 illustrates a’t'op plan view of my switch
withsthe cover removed therefrom.
Figure 2 illustrates the switch in a view similar
to that of Figure 1, showing the parts in a dif10
insulation block [I and is provided with a turned
down- end 32' adapted to engage the cam II. A
supplementary spring leaf 33 provides additional
spring tension without making the arm I! ex
cessively’ heavy.‘ A bearing strip. 34 is provided
near the end of the spring arm I! to hold a por
tion of the arm 32 rigid.
A spring arm ‘II and a supplementary spring
arm 38 are slidably secured in a slot 81 in the
insulation block I I.’ These spring arms 38 and
Figure 3 is' an elevation view of the switch and 36 are secured to an operating push rod SI having
cover therefor, as it would appear along the line ‘ an operating button ll of insulating material
ferent position.‘
3-4 of Figure 1.
Figure 4 is a perspective view of the thermo
15 static motor showing the operation thereof.
Figure 5 is a side elevation viewof' my switch
with the cover removed.
formed thereon. Vertical notches ll are formed
in‘the block ll adJacent the slot 31, and the arms
35 and 38 are bulged outwardly tosome extent to 15
spring into these notches II when the arms I!
- and It are in extreme positions. The. free end
of the arm II is provided with a bearing member
Figure 6 is a perspective view of a slightly dif
ferent form of switch embodying the snap action
20 for opening and closing a circuit.
42 which engages the bearing strip 34 on the
strip 32.
My switch A comprises a‘ base ll, having
The cam I. normally engages the bearing mem
ber 42 on the arm ll which contacts the bearing
strip 34 on the arm I! to close the contact be
mounted alongone side thereof ablock ll of
insulating material. The shape of this block H
is perhaps best shown in Figure 5 ofthe drawing.
25 A slot I2 is cut intothe block I l near one end
thereof and a strip of bimetallic material it is
inserted in the slot II. The bimetallic strip I3
tween the arms I! and 8!. During therotation
ofthe cam 8., however, the bearing end 42 drops
‘away from a high point 43 of the cam. II. The
is held in position by the bolt ll extending
end 32’ of the am”, however, remains in con
tact with -the high portion 0! the cam. thus act
through a portion of the block il from one’ ‘end .ingtoseparate the arms 32 and ll, andto break
30 thereof, and terminating in a notch I! in the
block ll.
contact therebetween. The contact between the
"' '
A sleeve of insulating material It, such as as- ' end 32" of the arm 32 drops from the 111811 Mt
bestos or the like, envelops a portion of the bi
metallic strip .IS, and a heating element i1 is
woundabout the sleevelli. A spring am it
into contact. By maintaining the arm ‘I! in a
constant positio and by moving the arm II in
having a downwardly extending end 20, is secured
at II to the free end of the strip I3. This down
wardly extending end 20 slides over a block 22
shown in Figure 2, the length oi’ timebetween
the dropping of the arm 38 from the high point
of the cam II and the dropping of the end 82'
I of insulating material partially covered by a con
40 tact plate 23. An upwardly extending cam lug
.24 of insulating material, projects upwardly from
the block 22 adjacent the contact plate 23. The
block" isseeuredto'theba'se lloftheswitchA.
. Upon de?ection of. the ‘strip II, the arm I! is '
carried forwardly, the downwardly extending end‘
II slidably‘contacting the contact plate 2;. The
path of movement of the end 2| is obstructed by
the lug It so that continued de?ection of the
strip It causes the end II of the arm II to slide
along the plate 23 near the edge thereof, tmtil
the end 2| - -
the lug 24; During 'this move
ment, the'arm ll is i'iexedout or normal position"
to some extent. Upon movement past the lug 24',
however, the end 2| movesby force of the resil
-iency of the arm I! snapping out of contact with
the plate 28, and sliding over the-surface of: the
block 22. Asthe strip i3 flexes from the position
illustrated in Figure 2 back to the position illus
trated in Figure 1,v the lug It prevents movement
tact plate 23 until the strip It ?exes a predeter
mined amount. " The
ve'ment of the end 2. of
the arm‘ ll along the ug 24, ?exes thearm‘ll so
that when the end," clears the lug 2!, this end
II will snapinto contact with the'plate l8. _, Thus I
isE E
5‘.3 E.
in bothdirectionsof movement of the'strip It a 1
contact is provided with a snap action‘.
‘Rotatably moimted pponsspindleurpmviaej l,‘ the gear'lllisrotatjed a short distance. Rob
a-pinion?. The
a gear 20 which
gears” and l‘li'ajr‘eiprevented-i'mm rotating in
one direction bythe spring ratchet pawl II. The
_- plnion?engagesthegear?whiehcan-iesthere
_with'a cam II. Thecamll and gear 2! are
mounted upon a suitable spindle 3 I .
A spring arm" is securedin a slot‘lin
Asmaybeseemtheexternalcircuittohe II
controlled extends through the wire l4’, the-arms.
rotatable member thereupon, a bimetal strip
wire 40 to the other supply wire 45. Whether
able therewith by de?ection thereof into contact
with said rotatable member, means guiding said
II and 32, and the wire 41, returning through the » secured at one end to said base, resilient means secured to the other end of said strip and mov
‘ or not this external circuit is broken depends en
the position of the arms 32 and II
and the cam 3|. The movement of the arm I!
' is diagrammatically shown by small arrows in
Figure 4 of the drawing.
resilient means out of its normal path of move
ment and ?exing said resilient means, said guid
ing means permitting said resilient means to
_ In Figure 6 I illustrate a simple switch embody ' snap into contact with said rotatable member 10
when released from said guiding means, said
10 .ing my system of snap action. .This switch ~is guiding mains ?exing said resilient means in the
illustrated as having a longitudinally movable
separating bar “extending through Journals
‘I. Movement of the bar." is limited by stops
II. A ?exible arm I! is secured to the insulating
15 bar I! and is provided with a downwardly ex-.
tending end 53 in slidable contact with the plate
N.‘ The arm 52 slides along the plate 54 until
it engages a lug 55 mounted adjacent the edge
of the plate 54. The lug 55 is angularly disposed
20 with respect to the movement of the arm ‘I, and
acts to de?ect the arm 52 to one side. This de
?ection of the arm 52 continues until the end
II thereof clears the lug II, whereupon the arm
"snaps back behind the lug 55 on to the insulat
25 ing block 56. A circuit between the arm 52 and
> the plate 54 is in this way broken. Upon return
movement, of the insulating arm 49, the arm 52
engages the back surface of the lug 55 and is
de?ected in the opposite ‘direction to its previous
de?ection until moved su?iciently to clear the lug
it, whereupon this arm snaps into engagement
with the contact plate 54, thus closing the cir
cuit between this plate and the arm 52.
It may be seen that the application of \a switch
35 of this type is virtually unlimited, and that my
construction may be applied to many different
types of devices. With this construction, the use
0! relay is avoided, a snap action between the
contacts providing a su?lciently good electrical
40 connection to obviate the necessity thereof for
most purposes.
In accordance with the patent statutes, I have
described the principles of construction and op
eration of my switch and while I have endeavored
45 to set forth the best embodiments thereof, 1 de
sire to have it understood that this is only il
lustrative of a means of carrying out my inven
tion and that ovbious changes may be made
within the scope of the following claims without
departing from the spirit of my invention.
I claim:
l. A thermostatic motor comprising a base, a
rotatable member mounted thereon, a bimetal
strip secured at one end to said base, means se
55 cured to the opposite end of said strip and mov
able by de?ection of said strip in one direction
into engagement with said-rotatable member,
opposite direction, holding said resilient means
into engagement with said rotatable member‘ for
a predetermined distance and releasing said re
silient means to snap said resilient means out 18
into the normal path 'of movement of said re
4. A thermostatic motor comprising a base, a
rotatable member mounted thereupon, a bimetal
strip secured at one end on said base, a dog, se 20
cured to the' otherend of said strip, means pre
venting rotation of said rotatable member in
one direction, de?ection of said strip moving'said
dog into engagement with'said rotatable member
to rotate the same.
5. A thermostatic motor comprising a base, a
rotatable member thereupon, a means laterally
de?ectable by a rise in temperature secured at
one end to said base, a means .for preventing -
rotation of said rotatable member in one direc
tion, lateral de?ection of said de?ectable means
moving said de?ectable means into engagement
with said rotatable member to rotate said rotat
able member.
6. A thermostatic motor comprising a. base, a 35
rotatable member mounted thereupon, a laterally
de?ectable member on said base deflected by a
rise in temperature, a dog engageable withsaid
rotatable member mounted on said de?ectable
member and operable to rotate said rotatable
member, a contact plate, means on said dog 'slid
able over said contact plate during the time said
dog is out of contact with said rotatable member,
a heating element adjacent said de?ectable mem- '
her, and a circuit extending through said con
tact plate, said dog, said heating element and a
suitable source of current supply; to energize said
element when said dog is out of engagement I
with said rotatable member. .
'1. A thermostatic motor comprising a base, a
rotatable member mounted for rotation‘with re
spect thereto, a de?ectable member de?ectable
by heat secured at one end to‘said base, means
on the other end of said de?ectable member en
gageable with said rotatable member to rotate the
same upon de?ection, contact means engageable
with said engageable means during the time said
and means’ engageable with said movable means . engageable means is out of engagement with said
for holding said movable means in contact with rotatable means, a heating element adjacent said
said rotatable member during a predetermined de?ectable means, and a circuit through said en
‘rotation of said rotatable member during de?ec
tion of said strip in the opposite direction.
2. A thermostatic motor-comprising a base, a
rotatable member mounted thereon, a bimetal
strip securedat one end to said base,vmeans se
‘ gageable means, said contact means and said
heating element closed when said. engageable
means is out of contact with" said rotatable
'8. A thermostatic motor comprising a base, a
cured to vthe other end of said strip and movable rotatable member thereupon, a de?ectable tem
upon de?éction of said strip into contact with perature responsive member secured at one end
to said base, means secured to the free end of
said rotatable member, means guiding said mov
de?ectable member. engageable with said ro
able ‘means to delay contact of said movable
tatable member to rotate the same, insulating 70
?ects a predetermined distance, said means means engaged by said engageable means during
holding said movable means in contact with said‘ a portion of its movement, a contact ‘plate ven
rotatable means throughout a predetermined re-. gaged. by said engageable means throughout the
remaining portion of the movement of said on
a turn deflection of said strip.
76 ~ 3. A thermostatic'motor comprising a‘ base, a
gageable means, a heating. element'adjacent said 15
de?ectable member, and a‘ circuit thrcugh'said' said ?exible arm is slidably cnsagcd, said contact
contact plate, said‘ engageable member, and said
heating element to close the circuit to said heat
ing element when said enzageable means is out
. of contact with said rotatable member,
9. A switch comprising a movable element mov
able between two extreme positions, a ‘resilient
plate including a conductive portion and a non
conductive portion and cam means in the path
oisaid arm,saidoamholdingsaidarminen
gagement with said contact portion ?exing said
arm until said arm. isvmoved out oi engagement
with said cam, whereupon said arm ?exes quickly
secured to said movable element, ‘a bearing ‘onto said non-conductive portion.
11. A switch comprising a 'reciprocable mem
ber, a conductive ?exible arm secured. to said re
plate slldabl'y enmeable with said resilient arm
10 including a contact plate and an insulating'por
tion, a'cam lug engageable with said arm to ?ex
clprocable member to move therewith into two
said resil‘i?nt arm, said lug holding said arm in
extreme positions, a plate slidably engageable
mined movement of said movable element in one
portionjon said plate, andvcam means between
th said contact plate for a predeter
direction, and out of contact with said ‘contact
plate for a predetermined movement of said mov
able element in the other direction. -
10. A switch comprising a reciprocable member
movable between two extreme positions, a ?exible
an arm conductive of electricity secured to said ,re
ciprocable member. a contact plate ‘upon which
with said arm, a conductive and non-conductive
said . conductive and non-conductive portions, 15
said cam de?ecting said am in one direction as
said reciprocable member moves in one direc
tion and ?exes said arm in the opposite direction
upon the return movement of said reciprocabie
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