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Патент USA US2070108

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Feb. 9,1937,-
A. BARGEBOER
2,070,108
ADJUSTING DEVICE
Filed June 16, 1931
5 Sheets-Sheet 2
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Feb. 9, 1937,
A. BARGEBOER
' 2,070,108
ADJUSTING DEVICE
Filed June le, 1951
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Feb. 9, 1937.
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ADJUSTING DEVICE
Filed June 16, 1931
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Feb.` 9, 1937.
A. BARGEBOER
2,070,108
ADJUSTING DEVICE:
Filed June 16, 1931
5 Sheets-Sheetl 5
Patented Feb. 9, 1937
2,070,108
UNITED STATES PATENT OFFICE
2,070,108
ADJUSTING DEVICE
Adolf Bargeboer, The Hague, Netherlands
Application June 16, 1931, Serial No. 544,831
In the Netherlands February 2, 1931
5
10 Claims. (Cl. 236-1)
This invention relates to an adjusting or con
The invention will bemore fully explained with
trol device for elements such as valves, electrical reference to the accompanying drawings, illus
contacts and the like, and has generally in view trating some embodiments by way of example,
to provide a device of this character which is ex
Fig. 1 is a diagrammatic View of a pressure
tremely sensitive in its operation.
According to the invention, a normally straight,
elastic leaf element of spring steel or other suit
able material has imposed thereon, axially or
longitudinally thereof, a practically unvarying
10 load which is substantially equal to the critical
collapsing load of the element; i.> e., the load un
der which the internal forces of the element are
in equilibrium with the load and have reached
their utmost value substantially without bending
of the element and which, if exceeded, results in
decided bending of the element. By imposing
such a load on a normally straight, elastic leaf
element it becomes highly stressed and its sensi
tiveness to ilexure is vastly increased, so that if it
2 O is subjected to a separate bending force it flexes
in extremely abnormal proportion to the bending
force, depending upon its inherent elasticity.
Further, according to the invention, the bend
ing force to which the elastic leaf element is sub
o jected may have any desired origin. For exam
ple, it may originate from a pressure or temper
ature controlled diaphragm or the like, or it may
originate in the element itself, as is the case if the
element is, for example, in the form of a bi-me
30 tallic strip or of such other inherent nature that
it bends in response to variations in temperature.
In any event, the element such as a valve, elec
trical contact or the like to be actuated or con
trolled is carried by or is connected with the elas
tic leaf element. It follows, therefore, that since
the elastic leaf element flexes in extremely ab
normal proportion to the bending force to which
it is subjected, the valve, electrical contact or the
like is actuated in response to only very slight
40 bending forces and the device therefore operates
to perform its work with extreme sensitiveness.
35
regulator according to the invention.
5
Fig. 2 illustrates an electric excess current cut
off device made in accordance with the invention.
Figs. 3, 4 and 5 show an electric temperature
controlling device in two vertical longitudinal sec
tions perpendicular to each other, and in cross 10
section, respectively.
.
Fig. 6 shows, in vertical section, a gas temper
ature-controlling device.
Figs. 7 and 8 show two longitudinal sections of
another gas controlling device of tubular form.
Figs. 9, 10 and 11 illustrate a steam trap in ver
tical longitudinal, horizontal longitudinal and
vertical cross sections, respectively.
I is the elastic element consisting of a normally
straight flexible strip of steel of suitable length, 20
Width and thickness, clamped by means of a
spring 5 between the frame 2 and a member 4
pivoted at 3. Attached to the strip I is a lever
6 which by means of the member 'I transforms
the force exerted on the diaphragm 8 into a mo- 25
ment on the strip I.
Connected with the leaf element I by means
of a stem 9 is a valve I 0 which is movable be
tween the seats I I and I2 by flexure of the leaf
element. The load imposed on the leaf element 30
by the spring 5 is substantially equal to the criti
cal collapsing load of said element, and is main
tained practically unvarying due to the consid
erable length of said spring 5 and to the lever
arm 4 through which the spring. operates to load 35
the leaf element. According to the illustrationv
in Fig. 1 it may be assumed that a negative pres
sure exists below the diaphragm 8 so that through
the rod 1 and arm 6 the leaf element is subjected
'to a movementl tending to bend it toward the left. 40
Only a very slight force exerted through the arm
Moreover, by limiting the range of ñexure of the ` 6 is required to flex the leaf element in either
elastic leaf element, high pressures of the same direction. Therefore, the instant the negative
in its `extreme flexed or bent positions will result pressure below the diaphragm 8 becomes a posi
45 from only very slight bending forces to which tive pressure the leaf element will be flexed to- 45
the element is subjected, which is of manifest ben
ward the right.
,
.
eilt and importance in many uses of the device.
Fig. 2 illustrates an electric overcurrent safety
The elastic leaf element is most sensitive to device according to the invention. I5 is an elastic
ilexure if the axial load imposed thereon corre
bimetal strip which, at a certain predetermined
sponds exactly to the critical collapsing load of or critical temperature, is straight and which 50
' said element. However, said element is highly ilexes to the right if its temperature exceeds said
sensitive to flexure if the axial load imposed there
critical temperature, and to the left if its tem
» on 1s in the immediate neighborhood of its criti
perature falls below said critical temperature.
cal collapsing load, whether slightly above or be
The strip carries a contact I8 for cooperation
low the critical collapsing load,
with an insulated contact I'IV which is adjustable .5 i
2,070,108
2
by means of a screw I8. The strip I5 is axially
clamped or loaded corresponding approximately
to its criticai collapsing load at its critical tem
of the spring 5 very close by the collapsing load
of the strip and by providing the valve 35 with
an elastic tightening surface that is more or less
perature between the frame 2 and lever 4 by
means of the spring 5 adapted to be adjusted by
uneven.
means of a
and bearing
perature of
perature its
spring` with set-screw 40 to determine the initial
screw I9 threaded into the lever 4
on the frame -2. Now if the tem
the strip is below its critical tern
internal movement is »such that it
obtained on the seats 31 and 38.
gaged with the contact I1. If at 20 and 2| the
electric current wires are connected through a
supply apparatus the current flows through the
contacts I1, I6, the strip I5 and the frame 2. In
15 the case of an excessive load the temperature of
the strip I5 rises above its predetermined or
critical temperature, the internal moment at
tains the critical _value and the strip collapses
suddenly into the position shown, producing an
Figs. 7 and 8 show two longitudinal sections of
10
another gas-regulator of tubular form.
The operation is similar to that described with
reference to Fig. 4, the axial load however being
obtained by a spring 4I acting on a yoke 42, 43.
The bimetal strip I5 supported at one end is at
the -other end acted upon. by a spring 44 with
tension controlling device 45 to determine the
moment acting on the strip. Further the strip
carries directly the Valve 4B co-operating with
the seat 41 located opposite an aperture 48 for
20 instantaneous interruption of the current.
By
suitably adjusting the screw I9 and the spring 5
it is possible that the strip after cooling does not
the passage of the gas. The whole is enclosed in 20
a tubular casing 49 whereby a gas regulator of
<
While the ilexure of a bimetal strip under nor
25 mal conditions at the allowable rises of tempera
ture is but very small, this flexure is increased
some hundred times by carrying out the inven
tion and moreover, if desired, instantaneously.
For this reason the application as a regulator is
also possible.
30
K
Figs. 3-5 show an electric temperature regulator
_ according to the invention in two vertical longi
tudinal sections, perpendicular to each other, and
in cross section respectively.
35
39 indicates a
moment on the strip I5.
10 bends toward the left and the contact I6 is en
rebound.
When adjusting for instantaneous op
ening in both extreme positions a tightening is
very compact construction is obtained.
It appears further that the energy which a
bimetal strip at a small change of temperature
can produce, is much larger when using the in 25
vention, than without axial load. On this re
sult the construction of a thermic motor accord
ing to the invention is based. It is thereby pos
sible e. g. to use the strip for the reversal of a
valve .or valves dependent on the periodical heat
ing or cooling of the strip. Now, if the reversal
acts to desist the origin thereof (i. e. heating
or cooling) then the machine operates auto
matically. This may be applied e. g. to a liquid
35
The elastic bimetal strip I5 is clamped on a
block of insulating material 22 and carries at its
return-device to the evaporators.
just free from an abutment 24. If the tempera
ture is too low contact is made with a contact
Fig. 9 is a vertical section, Fig. 10 a horizontal
section and Fig. 11a cross section thereof.
The bimetal strip I5 is tensioned in -the frame 40
In Figs. 9-11 this thought is embodied in a
non-clamped end a contact spring 23 which is ' condensing vessel.
40 screw 25 while in the other position the strip is
retained by a stop screw 26 provided with an
insulated cap. Two lateral springs 21, which are
52 by means 1of the yoke 5D and the spring 5I
attached to the strip.
The strip carries a valve
tensioned between the yokes 28 and 29, serve to v spindle with valve 53 adapted to close upon a
axially load the strip I5, while the spring 3l, the seat 54 adjustably secured in a body 55 which 45
tension of which may be regulated by means of is laterally tightened by the flanges 55, carry
45 a rotatable knob 30 (Fig. 5) serves for the ad
ing the frame 52. The valve spindle 53 lifts
justment of the switching-out temperature. 'I‘he during the last portion of its opening stroke the
said rspring engages a profile piece-rigidly secured spring support 51 against the force of the ten
to the strip I5, whereby a moment is exerted on sioned spring 58. 'I‘his spring bears at its other 50
the strip I5. The current wires are secured to end against a spring support 59, whereby by
the contact screws 32, 32. By suitable choice of means of a set-bolt 5I) in a casing 6I the spring
the essential values an instantaneous switching> tension is adjustable.
Now, if steam enters through 62 the strip I5 is
in and out ata temperature interval of 1 / 100° C.
may be obtained. >
Fig. 6 shows a gas temperature regulator ac
55
cording to the invention. ~
The bimetal strip I5 is clamped or tensioned by
_the spring 5 by means of the frame 2 and a lever
4, the tension of the spring being adjustable by
means of a screw 33.
60
The strip I5 actuates a
valve 35 by means of a valve spindle 34.
` »
The whole is immersed in a liquid chamber of
the vessel to be regulated in such a manner that
the tube 36 is immersed under the liquid level
somewhat more than corresponds with the gas
65
pressure. In thismanner a frictionless tight
ening is obtained. The spring is in this embodi
ment adjusted so that the first portion of the
closing period when the adjusted temperature
70
is attained, elapses very rapidly and the last por
tion gradually so that the closing is mainly ef
fected very rapidly and further with apsmall
name the temperature is very accurately con
trolled dependent on the loss of heat to the ex
terior. This is obtained by adjusting the tension
heated and it collapses downwardly at a pre
determined temperature (e. g. 100° C.) and
closes the valve 53 with a blow on its seat 52.
Steam thus cannot escape. Now if condensa
tion water accumulates the whole is cooled
and at a predetermined temperature, e. g. 90°
55
C., the valve will be pulled open against the 60
pressure. The water escapes, while the valve
closes again -as soon as the steam reaches the
strip I5.
.
The great advantage of this construction is
that the valve is either entirely open or entire 65
ly closed and does not occupy a zero-lap posi
tion as in most of the condensing vessels. In
the latter case the valve will soon leak. The
spring 58 serves to take up the transverse load,
which at the moment of opening is exerted by
the steam pressure. Moreover an adjusting de
vice may be provided for by exerting a variable
initial-môment on the strip as e. g. in the regu
lators according to Fig. 3 (spring 3|) Fig. 6
75
(spring 39) and Fig. 7 (spring 44).
3
2,070,108
Instead of using the spring 58 the valve seat
may also be so shaped that on draining a pres
sure-difference above and underneath the valve
body is exerted in such a manner, that a down
ward pressure on the valve is maintained dur
ing the outlet period, which pressure is approxi
pendent oi' said variable force, of said moment
and of the amount of bending of said element,
mately equal to the pressure on the valve in the
said longitudinal force being approximately
equal to the critical collapsing load of the elastic
.4
The above described .constructions should be
merely given by way of example. The range,
however, is much broader.
I claim:
l. In an adjusting device, an elongated elastic
element loaded longitudinally by a substantially
unvarying force approximately equal to the
critical collapsing load of the element and lat
erally by a variable internal moment tending to
bend said element, the longitudinal force being
20 independent of said internal moment and be
ing applied longitudinally of the element when
the same is straight and coincident with the
chord thereof when the element is bent.
2. An adjusting device in accordance with
25
claim 1, wherein said elastic element is a bi
metallic strip.
3. In an actuating device, an elongated elastic
element loaded by a variable load tending to
bend said element and also loaded longitudinal
30
ly by a substantially unvarying force essentially
independent of said variable load and of the
amount of bending of said element, said longi
tudinal force being approximately equal to -the
critical collapsing load of the elastic element
and being applied longitudinally of said element
when the same is straight and coincident with
the chord thereof when the element is bent.
4. In an actuating device, an elongated elastic
element loaded laterally by a variable force
40
tending to bend said element and also loaded
longitudinally by a force essentially independ
ent of said variable force and of the amount
of bending of said element, said longitudinal
force being substantially unvarying and approxi
mately equal to the critical collapsing load of
the elastic element and being applied longitu
dinally of said element when the same is straight
and coincident with the chord thereof when
the element is bent.
5. In an actuating device, an elongated elastic
element subjected to the action of a variable
moment tending to bend said element and also
loaded longitudinally by a substantially unvary
60
substantially unvarying force essentially inde
closed position.
10 considered as embodiments lof the invention,
55
‘element subjected to the action of a variable
force and of a moment which tend to bend said
element and also loaded longitudinally by a
ing force essentially independent of said vari
able moment and of the amount of bending of
said element, said longitudinal force being ap
element and being applied longitudinally of said
element when the same is straight and coin 10
cident with the chord of said element when the
same is bent.
I
7. In an actuating device, an elongated elastic
element subjected to the action of a variable
internal' moment and of an external moment 15
which tends to bend saidelement and also loaded
longitudinally by a substantially unvarying force
essentially independent of said external and in
ternal moments and of the amount of bending
of said element, said longitudinal force being 20
approximately equal to the critical collapsing
loadr of the elastic element and being applied
longitudinally of said element when the same is
straight and coincident with the chord of said
25
element when the same is bent.
8. A device of the character described compris
ing an elongated elastic leaf element, resilient
means acting to impose on said element longi
tudinally thereof when the same is straight and
coincident with the chord thereof when the ele
ment is bent, a practically-unvarying load which
is approximately equal to the critical collapsing
load of the element, whereby the sensitivity of
said element to flexure is vastly increased, means
whereby said element is subjected _to a flexing
force, and means operable by flexure of said
element.
9. A device of the character described compris
ing an elongated elastic leaf element, means_in
cluding a spring and a cooperating lever acting
to impose on said element longitudinally there
of when the same is straight and coincident
with the chord thereof when the _element is
bent, a practically unvarying load which is ap
proximately equal to the critical collapsing load
35
40
45
of the element, whereby the sensitivity of said
element to fiexure is vastly increased, meansv
whereby said element is subjected to a flexing
force, and means operable by flexure of said
50
`
10. A device of the character described com
prising a normally straight, elongated elastic
leaf element, resilient means acting to impose
on said element longitudinally thereof when the
element is straight and coincident with the chord 55
thereof when the element is bent, a practically
element.
proximately equal to the critical collapsing load
of the elastic element and being applied longi
unvarying load- which is approximately equal
to the critical collapsing load of the element,
tudinally of said element when the same is
straight and coincident with the chord of said
means whereby said element is subjected to a
element when the same is bent.
of said element.
6. In an actuating device, an elongated elastic
30
bending force, and means operable by bending
ADOLF BARGEBOER.
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