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Feb. 9,1937,- A. BARGEBOER 2,070,108 ADJUSTING DEVICE Filed June 16, 1931 5 Sheets-Sheet 2 S _. /A/ VENTO/Q ÄDOLF BAQÓEBOEQ BY MA A T TQQ/vm@ Feb. 9, 1937, A. BARGEBOER ' 2,070,108 ADJUSTING DEVICE Filed June le, 1951 i 5 sheets-sheet 5 37 3.8 /A/L/E/v' To@ f) D @/- F 54965505@ Feb. 9, 1937. A.` BARGEBOER 2,070,108 ADJUSTING DEVICE Filed June 16, 1931 j/¿yff 5 Sheets-Sheet 4 AWS’. 4a» @43 L _.' 45 | MIM/5 +254 l _1-2-1 4f I 1"!9 I j, _J l /42 NL. r. l IL. . W@ AïToQA/Eys 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.