close

Вход

Забыли?

вход по аккаунту

?

Патент USA US2405869

код для вставки
Aug. 13, 1946.
2,405,869
A. WILD
THERMOSTATIC SWITCH
Filed Jan. 24, 1944'
'
32
.I
’
INVENTOR.
2,405,869
Patented Aug. 13, 1946
UNITED STATES PATENT OFFICE
2,405,869
THEBMOSTATIC SWITCH
Alfred Wild, Milwaukee, Wis.
Application January 24, 1944, Serial No. 519,481
11 Claims. (01. 200—139)
1
The present invention relates in general to im
provements in the art of temperature control,
and relates more particularly to improvements in
the construction and operation of thermostatic
switches for controlling the actuation of electric
2
An additional speci?c object of my invention
is to provide a simple, compact and strong switch
assembly which may be manufactured at
moderate cost from metal stampings or the like,
ER and which may also be readily assembled, dis
mantled, or associated with the device or system
with which it is to be normally associated.
A further speci?c object of this invention is to
provide an e?icient electric switch which may be
operation, and ?exible in its adaptations and 10 adjusted throughout a considerable range, and
the actuation of which is controllable by means
heaters or the like.
The primary object of this invention is to pro
vide an improved thermostatic switch which is
simple and durable in construction, reliable in
uses.
of a sturdy and reliable lei-metallic element.
These and other objects and advantages of the
present
invention should be more readily ap
and especially in conjunction with electrically
parent from the following detailed description.
heated ?at irons, to have available a durable and
A clear conception of the several features con~
reliable thermostatic control which is readily ad
stituting the present invention, and of the con
justable so as to vary the degree of heating.
struction and operation of my improved thermo
While many different types of such thermostats
static switch, may be had by referring to the
or thermostatic switches have heretofore been
drawing accompanying and forming a part of
proposed and used with varying degrees of suc 20
this speci?cation wherein like reference char
cess, most of these prior devices are either rela
acters designate the same or similar parts in the
tively complicated in construction, or frail in
various views.
structure, or not accurately adjustable, or insuf?
Fig. 1 is a part sectional side elevation of the
ciently sensitive and reliable in operation, or un
switch, showing the normally ?xed upper con
adapted for diverse uses and especially inplaces
tact in its uppermost and inactive position of
where they are subject to jarring and jolting, or
adjustment and the contacts open;
relatively costly to manufacture. Many of the
Fig. 2 is a full side elevation of the same switch,
prior thermostatic controls are therefore objec
with the upper contact moved downwardly to
tionable for one or more of the above reasons and
an active position, and showing the contacts
It is extremely desirable in connection with the
operation of electric heaters for diverse purposes,
have been a source of considerable annoyance to
users thereof.
It is a more speci?c object of my invention to
provide a new and useful thermostatic control
device which obviates all of the above mentioned
objections and annoyances, and which is simple,
sturdy, dependable, and relatively inexpensive.
Another speci?c object of this invention is to
provide an improved thermostat which is adapted
for many uses, and especially in portable devices
such as ?at irons which are subject to jarring
and jolting, Without detrimentally affecting the
operation of the thermostat.
A further speci?c object of the invention is to
provide an improved thermostatic switch which
closed;
Fig. 3 is another elevation similar to that of
Fig. 2, but showing the contacts moved down
wardly to an extreme inactive position and closed,
in order to reveal the available wiping action;
and
Fig. 4 is a transverse vertical section through
the switch assemblage, taken along the line 4-5
of Fig. 1.
While the invention has been shown and de
scribed herein as being especially applicable to
electric thermostatic switches which are ad
vantageously applicable to electrically heated ?at
irons, it is not my desire to unnecessarily limit
the utility of the improvement by virtue of this
may be conveniently and accurately adjusted to
speci?c disclosure.
control the degree of heat generated by the heater
Referring to the drawing, the improved ther
to which it is applied, and all parts of which are
mostatic switch shown therein by Way of illus
readily accessible for inspection.
tration, is adapted to be associated with the wall
Still another speci?c object of the present in
6 of various types of heaters, and comprises a
50
vention is to provide an improved temperature
supporting bracket 1 having an inverted U-shaped
controlled electric switch assemblage in which the
member or ?ange 8 at one end and an angular
relative position of the ?xed and movable con
abutment
projection 9 disposed laterally of the
tacts may be readily varied, but wherein the con
flange 8; an L-shaped rigid upper contact car
tacts are kept clean and most e?ective at all
55 rier arm l0 pivotally suspended at its medial por
times by suitable wiping action.
3
2,405,869
4
tion from the ?ange 8 by means of a pivot pin I I
ing bracket ‘I when the contacts I3, H are closed.
and having one end provided with a downwardly
The U-sh'aped thermostatic element 23 which co
directed ?ange l2 while its opposite end supports
acts with the projection 9 and lower arm I4 and
an adjustable but normally ?xed contact l3; an
which is retained in proper place by the bracket
L-shaped rigid lower contact carrier arm I4 like 5 ?ange 8, will be in relatively collapsed condition
wise pivotally suspended at its medial portion
as shown in Fig. 2 when cool, and will then per
from the bracket ?ange 3 by means of a pivot
mit the contacts I3, I ‘I to engage each other thus
pin I 5 and having one end provided with an
completing the circuit and energizing the electric
upwardly directed ?ange It spaced from the
heater which the switch controls. The coil spring
?ange I2, while its opposite end supports a mov
22 which coacts with the end ?anges I2, I6 of the
able contact I'! which is cooperable with the ?xed
carrier arms Ill, I4 will keep the contacts I 3, I‘!
contact I3 to make and break the electric circuit;
closed, until su?icient heat is imparted to the
an adjusting screw or rod I 8 having screw threads
thermostatic element 23 to expand the latter and
coacting with a ?ange I9 of the heater wall 6, and
being provided at one end with an adjusting
wheel 20 while its opposite end 2| coacts with a
medial portion of the upper carrier arm Ill; a
helical compression spring 22 coacting with the
carrier arm ?anges I2, IE and constantly urging
the upper arm Ill against the rod end 25 , and the
lower arm I4 toward the abutment projection 9
and toward contact closed position; and a U
shaped thermostatic element 23 disposed between
and normally coacting with the ?xed bracket
projection 9 and with the medial portion of the
lower arm I4.
The main supporting bracket 1 with its ?ange
8 and abutment projection 9 may be formed with
the aid of punches and dies, of a single piece of
sheet metal or the like, preferably having good
heat conducting characteristics, and this bracket
‘I may be detachably attached to the heated wall
6 with the aid of screws 24. The rigid L-shaped
contact carrier levers or arms Ill, Ill may also be
formed of durable metal either by casting, or of
sheet metal with the aid of punches and dies,
and the pivot pins II, l5 about which the arms
II], II are freely swingable, should preferably be
removably but ?rmly attached to the bracket ‘I
and ?ange 8 so as to facilitate assembly and dis
mantling of the switch mechanism. The adjust
able but normally stationary upper contact I3 is
secured directly to a sheet-metal conductor plate
cause it to operate in opposition to the spring
tension so as to swing the lower arm I4 down
wardly and to thereby separate or open the con
tacts I3, I’! thus breaking the circuit. This ac
tion is normally quite rapid; and When the ther
mostatic element 23 again cools off, the spring 22
will become quickly e?ective to again close the
contacts I3, I? and to make the electric circuit.
The degree of heating and cooling of the element
23, necessary to effect such automatic opening
and closing of the switch, may obviously be read
' ily varied by merely manipulating the hand wheel
20, and the screw threads on the rod I3 may be
made relatively small or ?ne in order to augment
the sensitiveness of the adjustment. As indicated
by Figs. 1 to 3 inclusive, the line of engagement
between the curved contacts I 3, I ‘I, will be shifted
slightly for each successive adjustment of the
upper carrier arm Ill; and due to the use of’sep
arate parallel pivot pins II, I5 for swingably
supporting the contact carrier arms Ill, I4, the
free swinging movement of these arms is not
materially retarded by their mountings and con
siderable lateral wiping action is imparted to the
contacts l3, I'I regardless of the position of ad
justment. Repeated adjustment and operation
will therefore maintain the faces of the con
tacts I3, I 7 clean at all times, thus assuring most
effective contacting and insuring dependable op
eration; and while the positions of the elements
25 which is insulated from its carrier arm II] by
shown in Figs. 1 and 3 are abnormal or inactive
means of insulation plates 26 and is rigidly at
positions, the mechanism may be adjusted to
tached to the arm IE3 by insulated rivets 21; and
various intermediate active positions throughout
the lower movable contact II is likewise secured
a considerable range.
to a similar conductor plate 26 which is also
From the foregoing detailed description, it will
insulated from its carrier arm I II by means of
be apparent that my present invention provides
insulation plates 29 and is rigidly attached to the 50 an improved thermostatic switch assemblage
arm I4 by insulated rivets 38. Each of the plates
which is simple, compact and durable in con
26, 28 is provided with an integral ear to which
struction, and which is moreover highly reliable
the ?exible leads or conductors BI, 32 may be
in operation and ?exible in its adaptations or
attached, and it is to be noted that the contact
uses. The improved structure is especially adapt
faces of the contacts I3, II are curved so as to
ed for use in conjunction with portable devices
provide approximately line contact for every
such as ?at irons, and jarring or jolting of the
available position of relative adjustment. The
mechanism does not impair or detrimentally af
upper contact adjusting hand wheel 29 may be
fect its normal operation. The actuation of the
provided on its upper face with calibrations or
improved thermostatic switch may obviously be
markings which are cooperable with a pointer or
varied throughout a considerable range by merely
the like associated with the heater wall ?ange I 9,
adjusting the hand wheel 26 and rod I8, and by
in order to visibly indicate the degree of actual
forming
the contacts I3, Ill with oppositely curved
adjustment of the normally ?xed upper arm It;
faces, and by mounting the contact carrier arms
and when utilizing the improved thermostatic
on separate pivots, the contact faces are main
switch to control the heating of a ?at iron, these
tained clean and most e?ective for all positions
calibrations of the wheel 28 ordinarily designate
of relative adjustment. The U-shaped thermo
static element 23 and the compression spring 22
cooperate to insure eifective actuation of the
During normal operation of the improved ther~
switch at all times, and the various parts of the
mostatic switch‘, the upper adjustable but nor
assemblage may obviously be constructed of suit
mally ?xed con-tact carrier arm III should be 70
able materials and with the aid of punches and
moved downwardly with the aid of the adjusting
the type or class of work to be performed when
the wheel is adjusted to various positions.
hand wheel 20 and rod IE, to a position such as
shown in Fig. 2', so that the lower arm I4 will not
engage the abutment projection 9 of the support
dies in a durable manner. All portions of the im
proved switch are readily accessible and the nor
mal operation thereof is automatic, and the im
75 proved thermostatic switch has proven highly
2,406,869
5
satisfactory in actual use and can obviously be
manufactured at moderate cost. The improved
construction of the supporting brackets 1 also
permits the various parts to be readily assembled
and dismantled, while providing a ?rm support
and retainer for the contact carrier arms l0, H,
the thermostatic element 23, and the spring 22
when properly assembled.
It should be understood that it is not desired to
6
arms swingable upon said pivots and extending
on opposite sides of said abutment, each of said
arms being of L-shape and having an end ?ange
extending toward the other arm in spaced rela
tion to each other, a spring coacting with said
?anges for constantly urging the contact carry
ing ends of said arms toward each other, a ther
mostatic element for separating said arm ends
interposed between said ?xed bracket abutment
limit this invention to the exact details of con 10 and one of said arms, and adjustable means co
acting with the other arm to swing the same
struction or to the precise mode of operation,
about its supporting pivot.
herein shown and described, for various modi?
cations within the scope of the claims may oc
6. In a switch, a supporting bracket having
spaced parallel pivots and a ?xed abutment pro
15 jecting from the same side thereof, a pair of rigid
approximately parallel elongated contact car
1. A switch comprising, a pair of elongated rig
rier arms swingable upon said pivots and extend
id L-shaped carrier arms swingable about spaced
ing on opposite sides of said abutment, each of
pivots and having their corresponding ends pro
said arms being of L-shape and having an inte
vided with surfaces which are spaced apart and
disposed on one side of said pivots, cooperating 20 gral rigid end ?ange extending toward the other
arm in spaced relation to each other, a helical
contacts carried by the opposite corresponding
compression spring coacting with said ?anges to
ends of said arms, a compression spring coacting
:eparate the contact carrying ends of said arms,
with said surfaces and constantly resiliently urg
and a U-shaped thermostatic element for sepa
ing said contacts toward each other through said
rigid arms, and a U-shaped thermostatic element 25 rating said arm ends interposed between said
?xed bracket abutment and the medial portion of
interposed between said arms on the opposite side
one of said rigid arms.
of said pivots and acting in opposition to said
cur to persons skilled in the art.
I claim:
‘7. In a switch, a supporting bracket having
spaced parallel pivots and an integral ?xed abut
2. A switch comprising, a pair of elongated
rigid L-shaped carrier arms swingable about 30 ment projecting from the same side thereof, a
spring.
spaced pivots and having their corresponding
ends directed toward each other and provided
with surfaces which‘ are spaced apart and dis
posed on one side of said pivots, cooperating con
tacts carried by the opposite corresponding ends
of said arms, a compression spring coacting with
said surfaces and constantly resiliently urging
said contacts toward each other through said
pair of approximately parallel elongated rigid
contact carrier arms swingable upon said pivots
and extending on opposite sides of said abutment,
each‘ of said arms being of L-shape and having
an integral rigid end ?ange extending toward the
other arm in spaced relation to each other, a heli
cal compression spring coacting with said ?anges
midway between said pivots to separate the con
tact carrying ends of said arms, a U-shaped ther
rigid arms, a U-shaped thermostatic element in
terposed between said arms on the opposiite side 40 mostatic element for separating said arm ends
interposed between said ?xed bracket abutment
of said pivots and acting in opposition to said
and the medial portion of one of said arms, and
spring, and adjustable means for varying the
a threaded rod coacting with the corresponding
?xed positioning of one of said arms.
medial portion of the other of said arms for mov
3. A switch comprising, a supportiing bracket
ing said arm toward said abutment to compress
having an integral ?ange and an integral ?xed
said element.
abutment spaced from said ?ange, parallel pivots
8. In a switch‘, a bracket having parallel pivots
secured to said bracket and said ?ange, a pair of
and a ?xed abutment projecting from the same
carrier arms freely swingably suspended from
side thereof, a pair of elongated arms freely
said pivots and extending on opposite sides of
said abutment and having cooperating contacts ' swingably suspended upon said pivots and ex
tending along said side of said bracket, coacting
at the corresponding swinging ends thereof, resil
contacts carried by the corresponding swinging
ient means coacting directly with the opposite
ends of said arms beyond said abutment, the co
corresponding ends of said arms for constantly
acting surfaces of said contacts being reversely
urging said contacts toward each other, and a
curved and being relatively shiftable during
U-shaped thermostatic element disposed between
swinging of said arms, a spring coacting with the
said arms and coacting with said ?xed bracket
opposite ends of said arms for constantly urging
abutment and with one of said arms for moving
said
contacts toward each other, and a thermo
said contacts apart.
static element interposed between said ?xed abut
4. In a switch, a supporting bracket having
spaced parallel pivots and a ?xed abutment pro 60 ment and one of said arms for separating said
contacts.
jecting from the same side thereof, a pair of ap
9. In a switch, a bracket having parallel pivots
proximately parallel elongated contact carrier
and a ?xed abutment projecting from the same
arms swingable upon said pivots and extending
side thereof, a pair of elongated arms freely
on opposiite sides of said abutment, each of said
swingably suspended upon said pivots and ex
arms having an end ?ange extending toward the
tending along said side of said bracket, coacting
other arm in spaced relation to each other, a
contacts carried by the corresponding swinging
spring coacting with said ?anges for constantly
ends
of said arms beyond said abutment, a spring
urging the contact carrying ends of said arms to
coacting with the opposite ends of said arms for
ward each other, and a thermostatic element for
constantly urging said contacts toward each
separating said arm ends interposed between said
other, and a thermostatic element interposed be
fixed bracket abutment and one of said arms.
tween said ?xed abutment and one of said arms
5. In a switch, a supporting bracket having
for separating said contacts.
spaced parallel pivots and a ?xed abutment pro
10. In a thermostatic switch, a bracket having
jecting from the same side thereof, a pair of rigid
approximately parallel elongated contact carrier " thereon a pivot and a ?xed abutment spaced from
2,405,869
7
the pivot, an elongated arm freely swingably sus
pended upon said pivot, another arm swingably
suspended from said bracket adjacent to said piv
at and extending in the same general direction
as said ?rst mentioned arm, coacting contacts
carried by the corresponding swinging ends of
8
pended upon said pivot, another arm swingably
suspended from said bracket adjacent to said piv
ot and extending in the same general direction as
said ?rst mentioned arm, coacting contacts car
ried by the corresponding swinging ends of said
arms, a spring coacting with said arms to con
said arms, a spring coacting with said arms to
stantly urge said contacts toward each‘ other, a
constantly urge said contacts toward each other,
thermostatic element interposed between said
a thermostatic element interposed between said
?xed abutment and said second mentioned con
?xed abutment and one of said arms, and adjust 10 tact carrier arm, and an adjusting screw coacting
able means coacting with the other arm to prop
with said ?rst mentioned freely swingable con
erly relatively position said contacts for actuation
tact carrier arm to properly relatively position
by said thermostatic element.
said contacts for actuation by said thermostatic
11. In a thermostatic switch, a bracket having
element.
thereon a pivot and a ?xed abutment spaced from 15
the pivot, an elongated arm freely swingably sus
ALFREDWILD.
Документ
Категория
Без категории
Просмотров
0
Размер файла
623 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа