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Патент USA US2120938

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June
Carl GKronmíller
June 14, 1938.
C. G, KRONMlLLER
THI.«*.RMOSTA'1‘V
Filed Nov. 19, 1934
2,120,938*
2 Sheets-Sheet 2 ì
50
47
gwoentoc
Carl GKI'Onmiller
Patented June 14, 1938
UNITED STATES PATENT OFFICE
2,120,938
THERMOSTAT
Carl G. Kronmiller, Minneapolis, Minn., assigner
to Minneapolis-Honeywell Regulator Company,
Minneapolis, Minn., a corporation of Delaware
Application November 19, 1934, Serial No. '353,589
14 Claims.
This invention relates to thermostats and par
ticularly to thermostats utilizing a volatile fiuid
thermal responsive element for operating a novel
switching mechanism.
Due to present day transportation require
ments, it is necessary to maintain even tempera
ture conditions in moving vehicles such as air
planes, railway cars and busses. Thermostats
including temperature responsive fluid actuated
10 elements for operating switching mechanisms
have been installed in such vehicles to control the
temperature conditions therein but they have not
proved satisfactory due to the operation of such
vehicles through various altitudes with conse
quent changes in barometric pressure acting on
the thermostats to render their calibrations in
accurate and also due to severe jolting, jarring
and vibrating of the thermostats caused by the
motion of the vehicles which renders the switch
ing action thereof unreliable by causing vibra
tions to be set up in the movable contact arms of
the switching mechanisms.
Therefore, the prime object of this invention
is to provide a thermostat comprising a tempera
ture responsive ñuid actuated element for operat
ing a switching mechanism according to changes
in temperature which is suitable for regulating
the temperature of moving vehicles and which is
not effected by changes in barometric pressure
or by jolting and jarring of the vehicle.
Thermostats of this general character, using
temperature responsive fluid actuated elements,
are very accurate and maintain their initial cal
ibraticn as long as they are subjected to the same
atmospheric or barometric pressure condition as
when they are initially calibrated. However, a
thermostat of this .general character, when cali
brated at sea level, would not be accurate when
used at high altitudes and vice versa. Further,
ki (i local changes in barometric pressure caused by
changing weather conditions also have some ef
fect‘on the calibration of a thermostat of this
type to render it inaccurate. Since a thermostat
„of this general ,type may be used in places hav
' ing different barometric pressure than that where
the instrument is calibrated and since the instru
ment may be subjected to varying barometric
pressure by reason of its use in moving vehicles
or by reason of changing barometric conditions
caused by changing weather conditions, it is also
contemplated to` provide a thermostat of general
utility which is not subject to these changes in
barometric pressure.
Consequently, it is an object of this invention
to provide a temperature responsive fluid pres
sure-operated device or a pressure 'responsive de
vice, generally, that is not rendered inaccurate
by changes in atmospheric or barometric pressure
acting thereon.
More specifically, an object of this invention is
to provide a volatile fluid thermostat or pressure
responsive device embodying a double bellows
construction whereby the eiiect of changes in
atmospheric or barometric pressure acting there
on is reduced to a practical minimum.
Another object of this invention is to provide
a thermostat or pressure responsive device that
may be adjusted to and locked in an “oil” position”
whereby changes in temperature or pressure act
ing thereon will not operate the thermostat or 15
pressure responsive device.
A further object is to provide a novel adjust
ing and indicating means in a thermostat of the
class described.
/
A still further object is to provide a novel ad
justing and indicating means in combination with
a locking means `whereby a thermostat or pres-,
sure responsive device may be adjusted or locked
in an “off‘position” by a single control means.
Another object is to provide a switching mech
anism that is positively moved from one position
to another by a novel snap action means whereby
jarring and jolting of the switching mechanism
will not aiîect the operation of the switching
mechanism.
A further object is to provide a snap action
switching mechanism with means to insure move
ment of the switch arm in case the switch arm
should be stuck or held in one of its shifted posi
tions by failure of the snap action means.
Other objects and advantages will become ap
parent to those skilled in the art by reference
to the accompanying description and drawings
in which:
Fig. 1 is a vertical side elevational view of the 40
thermostat looking from the left in Fig. 2.but
showing the cover and the electric switch mecha
nism in section;
Fig. 2 is a front elevational view with the cor
ner remo-ved and the temperature responsive 45
means shown in section;
Fig. 3 is a top plan view with the cover removed;
Fig. 4 is a side elevational view looking from
the right in Fig. 2 with the cover removed and
showing the temperature adjusting means and
a modification of the temperature responsive
means in section;
Fig. 5 is a side elevational view looking from the
right in Fig. 2;
.
Figs. 6, 7, 8, and 9 are plan views of a portion 55
E
aisance
or“ the adjusting mechanism showing the parts
located in different positions oi adjustment.
it) designates a base made of insulating ma
terial such as “Bakelite” to which the various'
parts are secured and by which the instrument
may be secured to a wall or like structure. A
support ci' insulating material is shown at l i and
supports a plate l2. The plate l2 and support il
are secured to the base l@ by means of screws i3
which screws also act as electrical conducting
means from the plate l2 to suitable binding posts
located on the bacia of the base lli, lli designates
another plate similar to the plate i2 but spaced
rearwardly therefrom. The plates l2 and i@ sup
port, respectively, magnets l@ and l5. The plate
M and magnet i5 are secured to the base l@ by
means of a screw il and the magnet it is se
cured to the plate l2 by mea is oí a screw l@ coop
erating with a nut
The screws il' and i8
20 have abutments l5 and 2@ respectively located at
the inner ends thereof. Screw'll‘ aiîords an elec
trical connection between the plate id and a
suitable binding post located on the back of the
25
base iii.
Secured to the plates löl and l2 by means of
rivets 2t are spring arms 22 and
respectively.
rl‘hese spring arms 22 and 23 have contacts 25
and 2t and upwardly extending portions to en
gage the abutments l@ and 2li to limit the in
ward movement thereof. Located between spring
arms 22 and 23 is a conducting spring switch
arm 2l, having abutments 28 engageable alter«
nately with the abutments i@ and 2@ and contacts
andengageable
liti of the spring
alternately
arms 22
with
andthe contacts
Abutment
35 2e
levers lili and lll are provided in spaced relation
on either side of the spring switch arm 2l', the
abutment levers
and ¿il and the spring switch
arm 2l being secured to an actuator block 33,
made of insulating material, by means oi screws
32. An electrical connection is made between
by
the means
flexibleofswitch
a flexible
arm 2l
lead
andwire
a binding
36 being
post
con
nected to one screw 32 and the binding post
The forward plate l2 has a forwardly extending
ilange 3i? to which is riveted an insulating shield
38 by means oi rivets 3l.
39 designates a knife edge supporting member
secured to the base ill by means oi screws il@
50
and having downwardly extending knife edges di.
lever
in a counter-clockwise direction against
the top of the slot ¿it as viewed in Fig. l. Assum
ing that the temperature acting upon the tem
perature responsive means is relatively high, thc
lever ¿it is maintained in a counter~clockwise di«
rection against the tension of the spring ii2 as
seen in Fig. l to urge the movable contact 2@ oi
the switch arm 2l against the contact 25 and the
movable abutment
against the abutment itl
to complete an electric circuit from the screw il,
through plate
spring arm
contact 25, con
tact
switch arm
screws
and lead wire
to binding post dii. Current is also carried
from screw lil to switch arm 2l through the abut
ments lil and
'When the temperature decreases, the tension
spring 52 overcomes the force oi the temperature
responsive means tid and moves the lever «lil in a
clockwise direction from that position shown in
Fig. l. to move the contact 29 away from the con
tact
and the abutment 28 away from the abut
ment lil. However, the switch arm 2l is located
in the magnetic heid of the magnet l5 and this
movement is retarded until sufficient spring force
has been built up in the spring switch arm 2l Ji
to overcome this magnetic holding eiîect of the
magnet i5. When this magnetic effect is so
overcome, the tension in the switch arm 2l caused
by clockwise movement of lever @il will snap the
contact 2Q and the abutment il@ into engagement 30
with the contact
and the abutment 2li com
pleting a circuit from the screws i?) through plate
l2, spring arm 2S, contact 2G, contact 2t?, switch
arm 2li, screw
and wire il@ to binding post
Here again, current is conducted from plate
l2 to the switch arm 2l' by means of the screw
l@ and abutments
and 2li. Due to the fact
that the switch arm 2l is magnetically held in one
position until suñicient torce has been built up
to move it to another position, jolting and jarring 40
of the thermostat will not cause the switch arm
to vibrate between its contacts.
if, for any reason, the contact
should become
stuck to the contact Z5 or the abutment 22 become
stuck to the contact lil or the magnetic lields or"
the magnets iii and iti be too powerful so as to
prevent the above normal movement of the con
tact 29 and the abutment 2d to the right, iur
ther movement oi the lever «i3 in the clockwise
A lever 43 is provided with concavo~conveis por
direction will cause abutment arm 30 to engage
switch arm 2l to positively move contact 2S into
tions ¿32 to be engaged by the knife edges Gi and
an upwardly extending ñange @nl to which the
engagement with contact 26
the abutment
2li into Contact with the abutment 20. This in~
actuator block 33 is secured by means of screws
45. On the lower side of the lever ¿13 there is
suitably secured an abutment :il adapted to rc~
sures positive movement of the switch arm 21
to make and breal; the contacts.
"Ji Ui
Upon an increase in temperature, the tempera
ture responsive means 5E will overcome the ten
sion in the spring 52 to move the contact 29 into
engagement with the contact 25 and the abut~
ment 2li into engagement with the contact i9 in
- ceive a knife edge t8 which is held in place by a
bolt head ¿i9 of an upwardly extending bolt Sill.
The bolt 5U is screw-threaded into a grooved nut
60 5l which is secured to the lower end of a tension
spring 52 and the upper end oi’ the tension spring
52 is secured to a temœrature adjusting means
generally indicated at 53.
Also, on the lower side of the lever 43 is a con
' cave portion :'i?l adapted to receive a plunger
point 55 of a temperature responsive means gen
erally designated at
The forward portion
or" the supporting member Sii is provided with a
slot 4E through which the lever cli-3 extends to
provide stops to limit the movement ci” the lever
43.
»
From the above, it will be seen that the tension
spring 52 urges the lever 43 in a clockwise direc~
tion against the bottom of the slot 46 and that
the temperature responsive means 56 urges the
the exact reverse manner as pointed out above
and a complete description of this reverse opera
tion is therefore not considered necessary.
A vital feature of this invention is the pro
vision of a novel temperature responsive means 56 A
which is not affected by changes in barometric
pressure and which comprises a volatile fluid
containing chamber 5l which is secured by means
of bent over ñanges 58 to a plate 559 which is se»
cured by means of a screw G0 to the forward end
of the knife edge supporting member and by
means of screws 6i to the base lû.
Soldered to
the inside of the chamber iì'l' adjacent the top
thereof is an annular plate 62 and soldered to
the underside of this annular plate 62 is the up-`
3
2,120,938
per end of a bellows 63. Soldered -to the inner
periphery of the annular plate 62 is another an
nular plate 64, having adownwardlyextending an
nular shoulder 65 to which is soldered atubular
guide and stop member 66. At the inner portion
of the plate 64Á is soldered the upper end of a bel
lows 61 of much smaller diameter than the bel
lows 63. Soldered to the lower ends of the bel
lows 63 and 61 is a movable plate 68 which is
10 riveted and soldered to a vertical plunger 69.
_The spaces enclosed by the casing 51 and the bel
lows 63v and by- the bellows 63 and 61 are, there
fore, hermetically sealed. 'I'he vertical plunger
69 has a longitudinally extending bore 10- which is
15 normally closed by means of a screw-threaded
plug 1 I.
Secured over the up er end of the plung
er 69 so as to enclose the plug
I is a cap 18 which
has formed. integral therewith the plunger
point 55.
20
i
.
By removing the plug 1|, a charge of volatile
fluid may be inserted through the bore 1l) into a
chamber formed by the volatile fluid containing'
chamber 51, the annular plate 62, the bellows
63ì and the movable plate 68. After the required
25 amount of volatile ñuid has been inserted in this
chamber, the chamber is hermetically sealed by
inserting the plug 1I to close the passage 10. An
increase in temperature of the air surrounding
the' volatile fluid containing chamber 51 causes
30 the fluid contained therein to expand and act
volatile fluid is volatilized in the bulb 82 and
the pressure is transmitted therefrom to the
chamber 51 by means of the capillary tube 80.
f Although I have disclosed a volatile iiuid tem
perature responsive device, it is within the con- 5
cept oi' `this invention to include a pressure-actu
ated devíce wherein changes in pressure from
some pressure device may be transmitted into the
casing 51 by means of suitable connections.
The means 53 for adjusting the spring 52 to 10
de‘ermine at which temperature the thermo
stat will become operative is supported by means
of a support 85 which is secured to the base lil
by means of screws 8‘6. This support 85 extends
forwardly and supports the upper end. of a col
umn, 8l which is secured at its lower end into
the knife edge supporting member 39. „as seen
in Fig.
mounted in an opening in. t? support
85 is a shaft 88, having a. shoulder 89
abutting
relation. with the support 85, a c 9.n‘ gated por-«
tion 9U, e. screw-threaded portion 9i
a squared
92. Mounted against rotation on the
‘» ed portion 98 of the shaft 88
a cam 93
‘held in place by means of a n t 99 screw
on the screw-threaded po on 9i of 25
88.
Secured to the shalt beneath
‘t 85 by means of a pin 95
a helix
which' cooperates with a helix nut. 91,
ii which
the bottom
is attached
of the the
helix
'u ‘out’
E.
against the movable plate 68 to move the plunger
69 upwardly to actuate the switching mech
anism as pointed out above.
If the bellows 61 were not present, atmospheric
~35 or barometric pressure would exert a downward
force on the upper side of the movable plate *58
The helix nut @l
porting member 85.
‘
ri
By t
` . will
"i the
rotate
shaft
therewith
88 is rotated,
by reason
„l since the heiix nut @l is bei...
A.elia nut 91 will move
„ec'tio „ »carrying with
'and
tween
area
fected
would
isthe
bysubstantially
the
be
bellows
effective
volatile
63 the
fluid
and
uponsame
the
and
theplunger
annular
changes
as the 69.
area
in barc
99 and
40
f .
‘
‘the same time
40
metric pressure would counteract the action ci
>the
increase
volatile
in fluid
barometric
contained
pressure
in the would
chamber
retard
51. the
movement of the plate 68 by the expansion of
45 the volatile
thermostat
fluidWhile
and destroy
a decrease
the in
calibration
barometric
pressure would hasten the action of the volatiie
ñuid also to render the calibration of the thermo
stat
inaccurate.
g
adjacent
iiange
@l5 is an
downwar „
M2 which e
ad is plvoted to forward
‘dit of the supporting member S5 y mf
M13. The pin I0! ci the c ‘wnw
».g ñange §95 engages
a i" le *o the
'G62 so that upward and downward
"
` extend
`
50 theBydevice
inserting
as above
the relatively
described,small
changes
bellows
in baro
61
slideable member S9 causes os
metric pressure will affect the movabie plate 68 ` ment ci' lthe arm |02 about its pivot
only on the annular area defined by the bellows
~ 455
"cated dial |05 is secured to 'the ici
61 and the the plunger 69 since the space between
the ai i M2 by means of‘screws ttc and i" ‘"
the bellows 63 and 61 is hermetically sealed from
the atmosphere. This area is extremely small as
G01 in.
compared to the area subject tothe pressure of
the volatile fluid whereby any changes in baro--A
55
graduated dial I05 cooperates with
le cover lill! ‘to indicate in`
'tensio
ture
i the spring 52 or directly ..
tempera- .
which the thermostat will bec
e opera
metric pressure acting upon this extremely small » tive to move the switch arm 21. Rotating move
60 annular area
ll be practically negligible and
will not affect the calibration or operation of the
thermostat.
‘
'
In Fig. 4 I have illustrated ay modi ed form of
temperature responsive device wherein I use a
‘ remote control system. - The bellows structure is
the same as described above but the volatile fluid
containing chamber 51 has'an opening made in
the bottom thereof and a plug 19 is riveted and
soldered in this opening. The plug 19 is adapted
to receive in a‘gas-tight mannerk a. capillary tub-c
80; which is secured to a remote control bulb
82 and the plug 19 is also adapted to receive a
protective covering 8| for the capillary tube 88.
. The operation of this modification is the same
as the one pointed out above except that the
ment to adjust the adjusting mechanism 53 is 60
imparted to the shaft 88 by means of a key i09
engageable with the squared. portion 92 of the
shaft 88.
-
y
v
A’ latch arm i Il is pivotally mounted on the
upper end of the column 81 and is held in place
by means of a nut H0. This latch arm ill is
urged in a clockwise direction as shown in Fig. 3
by means of a spring I l2 which engages the latch
arm iii and the supporting member 85. On the f
outer end of the latch arm Ill is a proâection H3 70
which engages at various adjustments in notches '
H4, H5, H6, and H1 in the cam 93. These
notches are annularly spaced to correspond to
the graduations of- the dial |05 and in the ex
empliñcation shown, the latch projection H3 en 75
aiadose
gages in the notch `i id when the vgraduation. “Wi”
respond directly with the graduations “Sii”, “Gd”
the thermostat, that moves the switch with a
positive snap action, that insu
the novernent
of the switch in case the swi" h should become
stuck or held in any one oi its shii’ted positions
and; “off”.
and that provides a novel means 4¿or adjusting
appears in the opening lill oi the cover itil. En
like manner, the notches lliliö, M6, and Si? cor
,
'By referring to Figs. 6, 7, S, and 9, it is seen
that notches Sie and liti have 'tapered sides and
that notches iid have their sides nearesil to the
notches liti and lil@ tapered and their adjacent
sides not so ta ered so
clockwise movement
of the cam
as seen in
d is prevented and
counter~clocl§wise movement of the cam S3 as seen
in Fig. 9 is prevented. Therefore, these notches
Ilifl and i
determine the amount of rotation of
the cam
and consequently the range of ad
justment of the adjusting means 53. The 'tapered
sides of 'the notches eject the latch projection i i3
therefrom upon rotation of the cam
‘5
andindicating the adjustment of the thermostat.
While the apparatus herein described consti
tutes a preferred-embodiment of the invention,
it is to be understood that the invention is not
limited to the preferred apparatus and that
changes may be made therein without depa dg
from the scope oí the invention which is defined
in the appended claims.
claim:
i. ïn a device of the character described, comeV
prising in combination, a casing having an aper
ture therethrough, a movable wall in said casing,
an actuating member associated with said wall
shows the parts in position for operation at 74°,
Fig. 7 at 68°, -Fig. 8
6d" and Fig. 9 at “orf”.
and extending through said aperture into the
surrounding atmosphere, a bellows surrounding 20
it is obvious to anyone skilled in the art that
the number of notches
the cam Q3 and the
number of graduations on the scale iiih may he
increased or decreased at will according to the
said aperture and sealed to said wall whereby
said casing, wall, and bellows form a pressure
chamber, variations in pressure therein serving
to move said wall, and a seal adjacent said aper
desired adjustment of the instrument.
ture to preclude contact of atmospheric pressure
The arm lil?? extends downwardly and has an
abutment i2@ which engages a pin i2!! located on
with at least a portion of said wall.
2. En a device of the character described, com~
When
the upwardly
the adjusting
extending
means
ilange
53 has
¿id so
oi been
the lever
adjust
prising in combination, a casing having an aper
ture therethrough, a movable wall in said casing,
an actuating member associated with said wall 30
d@ ed to move it to “on” position, the abutment iliiii
engages pin. 02H as shown in Fig. 5 which pre->
vents counter-clockwise movement of the lever
G3 as viewed in Fig. 5 so that when the tempera~
ture aiîecting the temperature responsive means
55 decreases, the spring 52 cannot become op
erative to move the switching mechanism.
A brief description of the operation of the de
vice is as follows: Assume that the thermostat is
hooked up to a heating device in such n‘lanner
that when the contact 29 oi the switch arm 2li
and extending through said aperture into the
surrounding atmosphere, a bellows surrounding
said Aaperture and sealed to said wall whereby
said casing, wall, and bellows form a pressure
chamber, variations in pressure therein serving
to move said wall, and sealing means surrounding
said aperture and associated with said wall to
preclude contact or" atmospheric pressure with
at least a portion of said wall.
3. Zin a device or" the character described, com
engages the contact 25, the heating device will be " prising in combination, a casing having an aper»
shut oit and that 'when the contact 2@ engages the ture therethrough, a movable wall in said casing,
contact it the heating device will be turned on. an actuating member associated with said wall
With the parts in the position shown in Fig. "i, and extending through said aperture into the
the .device is adjusted to respond to a 'tempera
surrounding atmosphere, a bellows surrounding
ture o‘i 68° and the temperature acting on the said aperture and sealed to said wall whereby
temperature responsive means 5h is greater than said casing, wall, and bellows form a pressure
68°, therefore the heating device is shut ofi. When chamber, variations in pressure therein serving
the temperature falls below 68°, the tension spring to move said wall, and a second bellows surround
E2 overcomes the temperature responsive device ing said aperture and sealed to said wall but
56 and moves contact 29 of the switch arm 2li into positioned interiorly of said first mentioned bel~
engagement with contact 25 to complete a circuit lows with respect to said aperture whereby to
to turn on the heating device to restore the tem
perature to 68°. Lilre operation will occur when
the device is set for 741° and for 60°, the 74° posi
tion being shown in Fig. 4.
When. the adjusting means 53 is adjusted to
“off” position, the abutment i263 engages the pin
¿2i which prevents counter-clockwise movement
of lever 39 as viewed in Fig. 5 or prevents clock
wise movement of lever 43 as viewed in Fig. l..
Since this movement of the lever 39 is prevented
by means of the abutment §20, the contact 29
cannot move to the right to engage the contact
26 as viewed in Fig. i to close the circuit for turn
ing on the heating device. Therefore, when the
thermostat is adjusted to “oiï” position, it can
not become operative to call for heat regardless
of how low the temperature may fall.
From the above, it is seen‘ that I have invented
70
a novel thermostat that ls not rendered yinaccu
rate by` changes in atmospheric or barometric
pressure acting thereon', that may be adjusted
and locked in an “off” position whereby changes
75 in temperature acting thereon will not operate
40
form a seal to preclude contact of atmospheric
pressure with a portion or said wall.
in a device ofthe character described, com
prising in combination, a casing having an aper~
ture therethrough, a movable wall in said casing,
an actuating member sealed to said wall and ex~
tending through said aperture into the surround
ing atmosphere, a bellows surrounding said aper-- 60
ture and hence said actuating member and sealed
to said wall whereby said casing, wall, and bel
lows form a pressure chamber, variations in pres
sure therein serving to move said wall and- hence
said actuating member, a second bellows sealed
to said wall and to said casing adjacent and sur
rounding said aperture to form a hermetically
sealed chamber co-axial with and interiorily po
sitioned with respect to said pressure chamber
whereby to preclude contact of atmospheric pres~ 70
sure with a portion of said wall, said second men
tioned bellows being spaced from said actuating
member whereby said actuating member may
move in accordance with the movement of said
wall in a substantially friction free manner.
5
2,120,938
5. A pressure operated switch adapted for use
under varying external pressure conditions and
subject to‘jolting and jarring comprising', a pres
member tol engage said resiliently mounted con
tacts, adjusting means for determining the
sure actuated device having a member that is
Gi movable according to changes in pressure acting
thereon, means associated with said pressure
change in the condition required to move said
resilient member from one abutment to the other
and means associated with said adjusting means
to lock said resilient .member against one of said
device to prevent the varying external pressure
conditions from affecting the movement oi said
movable member, said means comprising a seal
ing member to Vpreclude contact of atmospheric
pressure with at least a portion of said pressure
actuated device, a resilient switch arm operated
by said movable member, contacts to be engaged
by said resilient switch arm, magnetic means for
resisting movement of said resilient switch arm
until said resilient switch arm is suillciently flexed
by said movable member to completely move
said resilient switch arm with a 'snap action
whereby jolting and jarring of the switch will
20 not cause said switch arm to vibrate.
6. In a switching mechanism of the class de
scribed, opposed abutments, opposed magnets
adjacent said abutments, opposed resiliently
mounted contacts adjacent said abutments,
means for varying the position of at least one of
said contacts and its associated abutment simul
taneously, a spring switch arm between said abut~
ments adapted to be moved from one abutment
to the other and held in shifted position by said
magnets until suillcient energy has been built up
in said spring switch arm to insure its movement
from one abutment to the other and contacts
abutments.
10. An adjusting and indicating means for an
instrument operated in response to changes in a
condition comprising, a rotatable screw and nut
for determining the change in the condition re
quired to operate the instrument, a cam rotated
by said screw and having notches therein, means
cooperating with said notches for determining
the value of adjustment and a graduated indi
eating dial moved by said nut to visually indi
cate the value of adjustment, said notches and
said graduations corresponding in value with
each other.
11. A combined adjusting, indicating and lock 20
ing means for an instrument operated in re
sponse to a condition, means for adjusting the
instrument for determining the change in the
condition required to operate the instrument,
means operated by said adjusting means for lock
ing the instrument whereby the instrument con
25
not be operated by changes in the condition,
means for indicating the value _of adjustment» and
the locking of the instrument and detênt means
for maintaining said adjusting means in any one 30
of its adjusted positions.
'
12. A combined adjusting, indicating and lock
on said spring switch arm to alternately engage . ing means for an instrument operated in response
said opposed contacts.
' 7. In a switching mechanism of the class de
scribed, opposed abutments, a magnet adjacent
- each abutment, a resiliently mounted contact ad
jacent each abutment, means for varying the
position of at least one' of said contacts and its
associated abutment simultaneously, a resilient
member movable alternately between said abut
ments and adapted to be held against said abut
ments by said magnets, means i'or ilexing said
resilient member to overcome the ei'iect of said
magnets -to snap said resilient member from one
abutment to the other and contacts on said re
silient member to engage said resiliently mounted
contacts.
8. In a switching mechanism of the class de
50
55
scribed, opposed abutments, a magnet adjacent
each abutment, a resiliently mounted contact ad
jacent each abutment, a resilient member’mov
able alternately between said abutments and
adapted to be held against said abutments by
said magnets, means for flexing said resilient
member to overcome the eiïect of said magnets to
snap said resilient member from one abutment
to the other, and means to move said resilient
member from one abutment to the other in case
80 said first means fails to move said resilient
member.
'
9. In a switching mechanism of the class de
to changes in a condition comprising, a rotatable
screw and nut for determining the change in the
condition required to operate the instrument, a
member rotated by said screw having a plurality
of detents therein, means cooperatingwith said
detents for determining the value of adjustment
and limiting the range of adjustment, a gradu 40
ated indicating dial moved by said nut and means
operated by said nut at one limit of the range of
adjustment to lock said instrument whereby said
instrument cannot be operated by changes in the
condition, said graduaticns of the dial corre 45
sponding to the detents of the member to indi
cate the value of the adjustment and the locking
of the instrument.
_
13. In a device of the character described, a
casing, an element _to be moved, means to move 50
said element in response to pressure changes in
said casing, means associated with said element
to preclude external atmospheric pressure from
ail’ecting said element, adjusting means movable 55
through a given range of adjustment for de
termining the change in pressure required to
move said element, and detent means associated
with said adjusting means for maintaining said
adjusting means in any one of a plurality of 60
»
adjusted positions.
14. In a mechanism of the class described, op
posed contacts, a magnet adjacent each contact,
scribed, opposed abutments opposed magnets a resilient member movable alternately between
adjacent said abutments, opposed resilientlyY said contacts andadapted to be held against said
65 mounted contacts adjacent said abutments, a
resilient member movable alternately between
said abutments and adapted to be held against
said abutments by said magnets, means respon
sive to changes in a condition for flexing said
70 resilient member to overcome the effect of said
magnets to snap the resilient member from one
abutment to the other, contacts _on said resilient
contacts by said magnets, means ior flexing said
resilient member to overcome the eiiect of said
magnets to snap said resilient member from one
contact to the other, and means to move said
resilient member from one contact to the other in
case said first means fails to move said resilient
member.
CARL G. KRONMIILER.
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