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Патент USA US2111856

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March 22, 1938.
M? E_ HENMNG
2,111,856
ADJUSTABLE CONTROL SWITCH
Filed Oct. 3, 1932
2 Sheets-Sheet 1
a?
M14 26
/2
22/1:
w?
M6
when
(J?nymwh
$5 '
2
56
54
'
J/VMW/a/
Mal-ch22, 1938.
M_ E. HENNiNG
2,111,856
ADJUSTABLE CONTROL SWITCH
Filed Oct. 3, 1932
-. Iii?
2 Sheets-Sheei 2
amo
Patented Mar. 22,1938
UNITED
osslcs
T?f l.
iljlllntiiii
_
Malcolm ll.
lilo; Iiloines, lows, oo=
.signorg to Penn Electron Switch Gov, {Dies
Molnes, lows, a corporation o? lows
Application @ctoher 3,? 1932, iserlal
(or coo: oJ
adjustable
?The object
control
of my
switch
invention
which is simple,
to provide
durable
and comparatively inexpensive to manufacture.
range
o'rljwting mechanism
in cross
A further object is to ?provide an adjustable
5 be
control
manipulated
switch having
for range
a control
adjustment,
knob which
for oojust=
merit of the switch structure to ?on?
?on??
positions manually and ?for manual reset oi? the
switch structure after it has been tm?pped
10 overload circuit, the controlswitch having aeldl=
tional range and di?erential adjusting meshes
hism which are accessible through the control
? knob and time from the outside oi?
a
3
I
aseotionol View on the
a
a View
J
?
?
than
Still a further object is to provide an adjust=
the
? ing the switch ?0 ? ?for defrosting,
it
- ?on? for starting automatic operation either after
it has been turned ?01!? for?defrosting or after
?it has been tripped because of an overload, diil?er=
25 ential adjusting and additional range ailiustino?
?being e?ected through an opening in the knob
itself so that the switch casing does not have
to be removed or opened for any of the adjust=
ing operations.
'30?
m" similar to
~
?
Still a further object is to provide a control
switch having a thermally releasable catch, rem
limll oi
6 showmg l5
?"f-v
o latched position.
I
9
a sectional View on the line one oi? ?
trol of ?a mechanical refrigerator with a single
25? control knob for effecting ?cold? control, time?
manua?hj released
View on the
5
able control switch especially adapted tor con=
,
5
to the right halt? oz?
? i.
switch
\
[la-mil
cew of the
sectioned.
~
sectional View on the line @?-io? oi? 10
casing without removing the knob, the knob
15 serving
oi the switch.
as an indicator of the ' position
'
I
a sectional View on the line M or
of the
how parts of the switch may
iii is amend elevation in the direction (20
ow i 0 adjacent
?If.
1S a separated perspective view of
"
control 9
oi? the switch assembly.
Figure L. is sectional view on the line 82-1412 7
(of, Figure
.
Figure
4
25
seotionm View on the line timid
of Figure 1c.
"
Figure it
p.
elevation of t e switch
structure; and ?
vIl?igure 155 is a sectional view on the line l5-==l8 30
of
2.
,
?
On the accompanying drawings, I have used
leasable due to an overload current ?owing ~ the reference numeral so to indicate generally a
through the switch and to provide an additional switch casing. The casing in has a front plate
latch which is operated by the catch to release i2 and a cover plate ii. The coverlplate I4 is 35
35- mechanism which moves the switch to open cir- \ held in position by a screw l6 (see Figure 6).
cuit position, the latch being also manually re
Within the switch casing I0, I provide an. L
leasable whereby the thermally releasable catch
shaped bracket A for supporting various movable
can remain in its caught position when the switch ? parts of the switch mechanism. The bracket A
is manually operated to open circuit position.
is confined in position by its ends being posi- 40
40
Still a further object is to provide speci?c tioned in slots 88 and 20 and a." clip 22 engaging
simpli?ed details of construction in the control the central portion of? the bracket. The clip 22
switch which will appear in the following is held, in position by a screw 2|.
~
?The bracket A carries a pin 26 on which a pres
With these and other objects in_ view my in
sure operated element B is pivoted. The element 45
?ventionj consists in the construction, arrange
B is adapted to be moved in one direction by
nient and combination of the various parts of my pressure within a bellows 28, such pressure be
speci?cation.
'
'
'
device, whereby the objects contemplated are at
tained, as hereinafter more fully set forth, pointed
50 out in my claims, and illustrated in the accom
55
switch is used for controlling a mechanical re
frigerator.
"
control switch embodying my invention and
The bellows 28 has a connection 30 with which
a tube and bulb (not shown). may be connected
and the tube, bulb and bellows may be suitably
showing a cover plate- removed therefrom.
charged in the ordinary manner so that when
? panying drawings, in which:
-
ing caused by a temperature increase when the
_
7
Figure l is a side elevation of an adjustable
Flgure2isasimilarview withpartsoi the, the bulb is located within a refrigerating oom
2
2,111,866
partment, the bellows 28 will be expanded by a
rise of the temperature therein.
Through the medium of a cap 32, the bellows
28 is connected by an engagement type of con
nection with the pressure operated element B.
The cap 32 carries a pin 34 adapted to engage in
a depression 38 of the element B.
The bellows 28 is opposed by a spring 38. The
spring 38 has one end seated in a cup 40 which
10 has projections 42 adapted to engage in notches
44 of the element B. Thus the cup is pivoted
relative to the element. The other end of the
spring 38 is seated in a cup 40 which is screw
threaded on a rotatable adjusting sleeve 48. The
cup 48 is held against rotation by a forked arm
48a (see Figure 12) engaging a rib 46b of the
casing I0.
The sleeve 48 is adapted to be rotated by a
control knob 50. The control knob 50 has an
20 indicator disk 52 secured thereto by screws 54.
A release disk 58 is also secured thereto by the
screw I08. The screw I08, as shown in Figure 2,
is carried by and threaded relative to the sleeve
48 so that rotation of the screw will adjust it
longitudinally relative to the sleeve. This pro
vides a differential adjustment inasmuch as the 5
extension I04. can be stopped at different posi
tions, thereby requiring more or less reduction of
pressure in the bellows 28 to start the lever D
toward its switch opening position.
From the foregoing description, it will be ob 10
vious that I have provided a switch construction
in which normal range adjustment may be ei
fectcd by rotation of the knob 50. The knob 80
is limited in its rotation by a stop pin I08 in the
sleeve 58 (see Figure 9) engaging a stop screw
IIO carried by the casing I0. Additional range
adjustment may be had by removing a closure
screw H2 in the knob 50 and inserting a screw
driver or the like H4 whereupon the screw I08
can be engaged for pressing the sleeve 48 inward
against the action of the spring 38 to the posi
screws.
tion shown in Figure 9.
A sleeve 58 extends rotatably through the front
As shown in Figure 14, it will be noted that the
plate I2 of the casing I0. The sleeve 58 has ?at .front wall I2 oi the casing I0 has graduations
25 tened surfaces 58a, as shown in Figure 15 and
thereon. The arrow shown on the knob 50 can 26
the disk 52, as well as the knob 50 have bores
be adjusted any number of points above zero be
which are of the same cross section so that the
fore the parts are moved to the position of Fig
knob 50 is slidable relative to the sleeve 58 but ure 9 and then after they are moved to this posi
non-rotatable relative thereto. Thus rotation of tion, it can be moved back to zero and the screw
30 the knob will rotate the sleeve.
Rotation of the sleeve 58 is imparted to the
sleeve 48 by a non-circular socket 80 of the sleeve
88 receiving a similarly shaped ?ange SI of the
sleeve 48 (see Figure 12).
Thus far, the pressure operated element B, the
range of which can be adjusted by rotating the
knob 50, has been described. The element B is
for operating a switch which will now be de
scribed.
40
A socket 82 is formed in the casing I0 (see Fig
ures 7 and 10). Prongs 64 and 86 extend from
the easing into the socket. The prong 84 has an
:xtension 64b terminating at a screw 88 (see
Figure 1). A resistance coil ?I0 is connected
45 therewith and with a screw ?I2.
The screw ?I2 is
carried by a bracket ?I4 which terminates at its
opposite end in a contact ?I8. The prong 88 has
a contact ?I8 and terminates at a screw or the like
80 which holds the prong in position.
50
The bracket ?I4 (see Figure 7) has arms 14a
through which a switch element C is slidable.
The switch element C is preferably made of in
sulating material and constrained to the closed
circuit position by a spring 82. It is provided
with an opening 84 into which a snap acting arm
D, or more speci?cally a lip 88 thereof. extends.
The switch element C carries a pair of bridging
contacts 88.
at 80.
These are carried on a bar pivoted
A spring 82 is interposed between the
60 switch element C and the bar for aiding in a
quick opening of the switch contacts, the pivot
80' somewhat loosely connecting the element 0
with the bar for this purpose.
The snap acting lever D is pivoted in depres
05 sions 84 formed in the bracket A. It is adapted
to be snapped from one position to another by a
spring 88 having heads 88 engaging pointed ele
ments I00 of the bracket A and of the pressure
operated element B.
70
The motion of the lever D to open circuit posi
tion is arrested by a shoulder I02 oi? the switch
element C engaging the left extension 14a of the
bracket ?I4 in Figure '7. Its motion in the oppo
site direction is arrested by an extension I04 of
75 the lever D engaging a differential adjusting
driver II4 thereafter withdrawn whereupon the 30
sleeve 48 will again assume a connected position
with respect to the sleeve 58, but the range will
have been additionally changed to the extent of
the number of graduations over which the knob
was rotated after placing the parts in the posi
tion of Figure 9. Thereafter, the high and low
limits of the normal range adjustment as caused
by rotation of the knob 50 will be changed by
this means of additional range adjustment.
The differential adjustment is effected by ro 40
tating the screw I08 by the screw driver II 4 in
serted as shown in Figure 9. After additional
range adjustment and/or differential adjustment
has ben effected, the screw driver is removed and
the screw I I2 replaced. It is thus obvious that 45
the mechanism for the two adjustments just men
tioned is accessible through the knob 60 without
removing it or without opening the casing I0.
It is desirable also to have the knob 80 man
ually operable for turning the switch "on" and 50
?off? and manually operable for resetting the
switch after it has been opened because of an
overload condition.
The mechanism for opening 01? the switch be
cause of overload will now be described. A slide 56
member E is connected with the bracket A by a
shouldered screw II8 extending through a slot
H8 01' the slide member. The slide member has
a U-shaped hook I20 to engage the disk 88 of
the knob 80 so that the slide member can be 60
pushed or pulled as desired by manipulating the
knob.
A thermally releasable catch F and a latch G
are slidable in/the bracket A, arms I22 and I24
vthereof respectively being slidable through slots 65
I22a and I 24a of the bracket A. The body por
tions of the members F and G are con?ned against
the right hand wall of the bracket A in Figure
11 by portions I28 and I28 of the member E.
The members F and G are constrained to move 70
toward the right in Figure 6 by springs I30 and
I32. These springs, as shown in Figure 3, extend
around the pivot pin 28, their general shape being.
shown perhaps best by dotted lines in Figure 1.
The catch member F is provided with a catch lug
3
tote
l3?! adapted to engage a ratchet Wheel
shown
in
soldered
Figures
to a2 tube
and I38
4; which
The ratchet
in. tumWheel
is suooorteel
036%,
on a pin Mt. The coil of resist-moo who it we
5 rounds the tube t 38 so that upon an excessive how
manually or thermally, the left end of the lug hit
in Ftg?ure ll will engage an edge t52o of the mm
[152 to swing the arm counterclockwise from the
position shown in Meme 1. This
the arm
engage the extensioh 95G of the switch elemeht
(C? to hol-zl the contacts t separated? from the co =
of current through the coil, the comet wlil he
latching or retet
melted so that the ratchet wheel {�
he The .tecte l6 and "US during;
"on" This
@l?dGf.? to prevent mohuoey
teterl. by the catch ?tt and the cotch
her it,
mg the switch
oloseel position
the
?which rotation will he caused h"? the c t- e use.
it)
The lotch?memhet G is adopted
m
assume the position oi? Figure who iem ?
shoulotet= t
?
?he t?esetting; ooetotioh has been 322%
thereof engages the edge
the wt in e; ?ange wt of the hatchet l
' "\ehr
hmoh
outwsmcl
5t
Somme
counterclockwise
E132 has a, tendency
as viewed
to totote
lit
lo ,G
the extension ?tlte?thtoug'h the oi
the as a Lotvot. Thus the spring 582 to?
the leteh show-tier M2 to. latched too1
and the
do
line he
a of
eieaseel
- the position
whereupontt
of
will move to the $19!)?
8, thereby pemutti '
5' he s
?
e soliel'l'me posttioh
does no there tter interfere
'0 that
itch etee
Whom of
thethe
catch
solder?
tilt connection
howevet
261) -meltlng
and closet
1oe Roms.
it) anal � a slot 868 com-
ratchet wheel [1536
thetuhe {188,
member
of the member
tot swinging
engages
the memhes
Toy clrculal' loot-sessions
from the Figure t oostttoh, The me
cl
WH] 3N noted, ere
and
respectively.
25 vthem he oueheel toward the he
of Figure 6 due to the action oi t?
"7 L1111'? 59539 ?10
This may he termed the uhlat
to the position for opening? the etch
7 It will he noted that the memher
- (IE2 canted there-lot?, This em";
and t?) is
'
L
to engage eh
> the twitch element
to move t_ ~
ton circuit loosltloh, Thus the
when an overload content ?ows 0
35 degree of overload loathe oletext
m
of the wire useol? he the tesiste
whereby the heat rethetetl thereh
ilk??
to the cum?eht? ?otmtg through I
� iet 02. This
U
4o
em
"a s3
e
goz?eoletemaihed.
The latch of the member @
401
uiotetched from the opening 96G.
iolishetl ?by pulling om
hhoh EC ?
? sttuetth?e in Wt
es 9, mumher
which
?lithe isslide
positioned
thememh
slideto o/slot
has t 58
an
E ?
45 ' l?tommlly
position of
121 v
the 05G engages the left end '
e;
6% Within
0
lmoh 0
to such petition籿
the knob we.
cater
?VLL
tl'le
he? tholtne
downwardly
of the lugso{15Bas to L
shoulder 6132 from
edge of "
_
?
55 resulting he the member (6} heihg move
The
open
ot'
circuit
thecltoutt
to
spring
open
posittou
{132.
position
Thus
of FLJUIQ
ts?e?ecte
mantel
63 duecontrot
he
e,
l have been determine the
H62 ?to
were on tnteezcol part of the letoh
Zlttvill he noted, however, that
thereto. It has o lug W3
21-h
'throtel move=
?spring
engages whereby? to
range adjustment, o2?
change
:o the Oi?lg?iHlE-tl tact
he made I; Woug?h the latch alts"
screw [3' [1
to peyote?
edge of the latch memhet? G to
meet of the em ltlt to one olh
65 ?ttt is provided on the arm I!
ocey Wm t
Dhiferenttel .?
t
a ?eet-eel white the screw removed?
' adjustments
tl toolptoo?f.areA mot/exposed?
latching
but are
mesh
with to provlded independent ot the the!
"
which m.
the stop
2) (27
mantle-Hy to
the
lug
well
pivotal
ltt
as engaged
import
motion sliding
to
with
it the
tending
motion
e?ge to
of
to the
retain
memher
lotcheol
G
70 es hereinhei'ore desctlbed.
The purpose of pivoting the
[152 is so that
when the parts are moved to the toll lm
"
of; position there is no wear on
of the ratchet [136. The latch shoulder
[N32 to of much more rugged cohttt'ucttoh ?M
the hatchet ?Wheel [I86 and thus takes the
-
manual
wears come
tmletchmg
on the teeth
rathetthen
which are
letting
in my
ell o
otruetiom used only for thermal uhletchlng o
- resetting thereafter.
theThe
e lmohlottttlopetl
oleo serves
to ?oh? position
eh tnofltcotor
due to
763
4
2,111,856
overload current flowing therethrough. When
the solder melts and thereby permits the ratchet
wheel I36 to rotate, the member F, or more specif
ically a lug I30a thereof, (see Figures 6 and 11)
moves toward the right and engages an extension
IZBa of the member E to move it from the dotted
line position of Figure 8 to the full line position of
Figure 6. This causes the knob 50 to be moved
to the position of Figure 5 where the indicating
operable to break said circuit, said range adjust
ing element being operatively connected with said
latch to manually release it.
disk 52 will be observable beyond the end of a hub
3. In an adjustable control switch, a pressure
in in which the disk 52 is normally concealed.
Although I have illustrated a speci?c control,
changes may be made in the construction and
arrangement of the parts of my device without
departing from the real spirit and purpose of my
invention, and it is my intention to cover by my
operated element, a switch element operable
thereby to make and break an electric circuit,
spring means opposing said pressure operated ele
ment, a range adjusting element for changing the
mechanical equivalents, which may be reasonably
tension of said spring means, overload means also 16
operable to break said electric circuit, said over
load means comprising a thermally responsive
member and a releasable catch which is released
included within their scope.
upon the thermally responsive member operating
I claim as my invention:
and- a latch releasable by said catch engaging
1. In an adjustable control switch, a pressure
therewith after such operation, said latch being
operable to break said circuit, said range adjust
ing element being operatively connected with said
claims, any modi?ed forms of structure or use of
20
.
operable to break said electric circuit, said over
load means comprising a thermally responsive
member and a releasable catch which is released
upon the thermally responsive member operating
and a latch releasable by said catch engaging 5
therewith after such operation, said latch being
operated element, a snap acting element asociated
therewith for operation thereby, a switch element
operated by said snap acting element, resilient - latch ?to manually release it and to reset it after
means opposing said pressure operated element
and means for adjusting said resilient means
comprising a rotatable element for changing the
adjustment upon rotation thereof, a knob element
for rotating said rotatable element, means for
1 I preventing removal 01 said knob and means of
operative connection between said knob element
and said rotatable element, said means of oper
ative connection comprising a non-circular socket
in one of said elements and a similarly shaped
portion on the other element to ?t therein, said
socket and said portion being disassociable
against the action of said resilient means while
said means for preventing removal of said knob
remains operative.
2. In an adjustable control switch, a pressure
operated element, a switch element operable
thereby to make and break an electric circuit,
spring means opposing said pressure operated ele
ment, a range adjusting element for changing the
45 tension of said spring means, overload means also
40
either overload or manual release.
4. In an adjustable control switch, a pressure
operated element, a switch element operable
thereby to make and break an electric circuit,
spring means opposing said pressure operated ele
ment, a range adjusting element for changing the 80
tension of said spring means, overload means also
operable to break said electric circuit, said over
load means comprising a thermally responsive
member and a releasable catch which is released
upon the thermally responsive member operating
a latch releasable by said catch engaging there
with after such operation, said latch being oper
able to break said- circuit, said range adjusting
element being operatively connected with said
latch for movement thereby to a different posi 40
tion after said latch becomes unlatched and
means on said range adjusting element to indicate
such different position.
MALCOLM E. HENNING.
L
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