DE1515595A1 - Snap switch - Google Patents

Description

my mark * o733 Pt

.Lr.;. -P

CONTROLS COMPANY 0Ϊ AMBRICA,

2ool North Janioe Arenue, Melroee Park,

Illinois, USA Snap switch The invention relates to a snap switch.

There are already known snap-action switches having a contact-receiving member and an actuating member, between which a toggle spring is arranged, which causes the contact-receiving member to move from one position to another, this toggle spring being the contact-receiving member uj & d holds in one of the tolerant positions causes the contact to open & Ksnd · Si led ▼ to be moved from one position to the other when. the toggle spring goes beyond the middle position, old «iaea (child»

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welohee auf dae «u pressing · link in a point a force exerts, wherein a spring is further provided which exerts a force opposing said force.

So far, the counteracting spring, which in the following is generally referred to as the "calibrator spring", such a characteristic that the actuated member must be moved positively by the switching force until the toggle spring has passed through the middle layer before the switching process takes place. This is usually a slow motion so that the pressure exerted by the toggle spring whichever way the movable Sohalt member holds in one of its stable positions, slowly drops to zero and in this lull position what remains is a switching process with soh poor efficiency causes and the danger of sparking swiaohen these contacts conjures up.

This Unsuträgliohkeit is according to the invention by Arrangement of a toggle spring and a counteracting spring eliminated, the combined spring forces of which are negative before the toggle spring goes beyond the cement layer.

The characteristics of this toggle spring are such that that before overshooting the middle layer by the Ki ppancrdnung this power component, which the tilt spring exercises, around i & s bctwegllohe solenoid in one of its stable positions au hold; *, or counteract a switching force »la is reduced. The other 'side eats ale

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The characteristics of the calibration spring are such that when they are compressed the spring force increases, with the conventional switches this increase is more than sufficient to to move the reducing spring force of the toggle spring beyond the central position of the toggle spring. By according to the invention it is ensured that at one point the toggle spring subjected to compression before it exceeds the central position, the increasing force of the calibration spring does not shift the decreasing force of the toggle spring - before the toggle spring exceeds the central position - reaches a point in which the activated, accelerated limb moves in a sense moves in such a way that the toggle spring is caused to move the middle « su exceed, so that the pressure that keeps the ir., chen contact in a stable position, quickly on Zero drops and through this zero point with high *. - * e «windiness passes through.

According to a further feature of the invention is ν counteracting spring or calibration spring »wipe the Pivot point of the operated member and that point ai arranges in which the switching force on the operated member acts.

The invention is explained in somewhat more detail below with reference to the reward. In this show in pure sohematic way

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Fig. 1 is a vertical section along dsr

Line 1 - 1 in Fig. 2 has a two-stage pressure Pressure switch according to dsr charge, whereby The switching mechanism is shown in the UBSchaltstsllung

2 shows a section along line 2-2 in Fig. 1

3 shows a vertical section along dsr

LiBis 3 - 3 in Fig. 2, with the other Switching mechanism in the switching part is shown

Fig. 4 shows a vertical section through a different view of the pressure Pressure switch genäse of the invention, the one Schaltneohanisnus course Gate dsr holding division and the other SchaltneohanisBus in dsr switching division is shown

Fig * 5 is a diagram showing the switching force

dsr Meabran Teramsehaulioht, wobsi diess Switching force acts against the movement of this membrane, and both the switching cam as well as dismantling barriers are allowed

Fig. 6 is a diagram showing the switching pressure TcransQhaulleht, dsr acts against the movement of the diaphragm, and both the

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So hold curves as auoh the so hold curves are shown.

The pressure switch according to the invention has a housing 12 and a metal cap 14 which is placed on the flange 16 is rolled up. The membrane 18 is clamped tightly to the housing 12 and the metal cap 14. The membrane 18 separates the inside of the pressure switch in a pressure chamber 2o and in a switching chamber 22. With the pressure chamber 2o there is an outlet nozzle 23 in connection »so that the pressure switch can be connected to an external pressure medium source, whose Pressure changes and can be used as a basis for actuating the pressure switch. The invention is preferred realized what in a two-stage press holder has the consequence that in the switching chamber 22 two switching tmeoha- * ~ niamen 24 and 26 are arranged. These switching mechanisms 24 and 26 are identical in structure. To streamline this description, only a single switching mechanism is intended are explained in detail, using prime numbers to make the same parts of the switching mechanism 26 with those of the switching mechanism 24 recognizable.

The switching mechanism 24 is one Mechanism of the knee-joint type, with a double sole holder, which with regard to the print holder, optionally a circuit closes, which passed through a normally closed contact 28 and a normally open contact 3o

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is. The contact 28 is carried by a finder plate 32, which in a suitable manner with the housing 12 in connection stands. The contact 3o, however, is carried by an end plate 34 which is connected to the housing 12 by means of a pin ▼ anchored and adjustable iat. The availability will be explained in more detail below. By the possibility the adjustment should be able to change the space between the two contacts 28, 3o. The movable one Switching tongue 38 has two sole plates 4o and 42 as well as one Sung-shaped part 44, all of which at their one End between the pin 45 of the housing 12 and the other Part 46 of the clamp 48 are clamped in with the aid of a lietee 5o passed through the housing 12. The movable one The end of the switching tongue 38 has a web 52 which connects the soles 4o, 42 to one another. This web 52 carries a contact 54 * which optionally comes into contact either with a contact 28 or with a contact 3o. A spring is compressed between the web 52 and the sung-shaped part 44 in order to avoid the possibility of switching to ensure by pivoting the sung-shaped rope 44 upwards beyond the central position, in which case the spring 56 takes the form of a barrel. It is clear that other springs of this type can also be used.

The movement of the Sohaltsunge 38 between the two Contacts 28, 3o are made by a tilting movement (snap movement) as a result of the knee joint effect, which is caused by the interaction of the soles 4o, 42 of the gearshift and the

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barrel-shaped spring 56 is formed. When moving from a the two switching positions out remains the movable contact either with one contact 28 or with the other Contact 3o in contact after the angle «wipe the rails 4o, 42 and the Bungenföraigen part 44 and accordingly the angle between the spring 56 and the rails 40, 42 is also reduced. With the conventional arrangements a spring force acts on the switching mechanism in a predetermined direction, whereby the rails 4o, 42, the tongue-shaped part 44 and the spring 56 are brought into a position in which these parts collapse, so match, prompting another movement in this Direction of the moving contact τοη the one contact position suddenly snap into the other contact position leaves. In other words the movement τοη of the one Switching position into the other switching position takes place through Increase in the pressure prevailing in the pressure chamber 2o, the resulting movement of the diaphragm 18 in the direction takes place on the switching mechanism. On the other hand, the reverse is done Movement τοη the one switching position in the other switching position as a result of the reduction in pressure in the Pressure chamber 2o in a direction in which the diaphragm 18 moves away from the switching mechanism. The pressure switch has also a calibration spring mechanism, which is a Exerts force which, in accordance with the pressure in the pressure chamber 2o, opposes the τοη of the membrane 18 Force works.

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The switching mechanism 24 is connected to the membrane 18 via a pin 58 and a bridge member 6o. The pin 58 has a flange 62 and a tongue-shaped socket 44, with the switching mechanism "wiping it" Flange 62 and shoulder 64 of pin 58 clamped is, so that a connection is established between the tongue-shaped part 44 and the membrane and a point of application A is formed through which the force acting on the diaphragm 13 acts on the switching mechanism. That Bridge element 6o reaches pin 53 via pin 66 in contact, and the connection between this bridge member 6o and the membrane 18 is completed by a lever 83, which is formed on the plate 7ο, which is connected to the membrane 18. The lever 68 engages here into a notch 72 on the underside of the bridge member 6o. In the embodiment shown in the drawing, the above-mentioned calibration spring mechanism Springs 74 and 76, which counteract the movement of the diaphragm 18 and consequently also the switching mechanism 24, and although according to a pressure increase in the pressure chamber 2o and also when the switching mechanism 24 in the one Switching position is in which the switching mechanism 24 is when the pressure in the pressure chamber is reduced 2o is located.

In the known embodiments, the spring of the calibration spring mechanism is arranged in such a way that it rests on acts on the point of attack, ensuring adequate Switching presses a spring force required «eight,

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which are necessary for a mechanical switching process and a This goes hand in hand with a lowering of the contact pressure in the stop point on Hull. The expression "mechanical So holding process "is chosen to reflect the type of switching process point out which physical movement of the spring beyond the central position is required in order to achieve the reversing moving contact acting restoring force in their sighting. After the movement of the point of attack small is, a reduction of the contact pressure to the value zero causes the switch as a result of vibrations and Impact switches prematurely and the switch contacts sparks form, thereby unduly adversely affecting the operation of the switch.

The force that is required to deflect the tongue sufficiently for the switching process, is determined by the barrel-shaped spring, which both a vertical as well as a horizontal component developed in the point of attack, whereas with the conventional ones mentioned above Arrangements the force is determined to a greater extent by the calibration spring Meohanisaus. To the electric To achieve properties of these switches, but primarily the problem of insufficient contact pressure when Shifting and releasing shortly before shifting is what makes the invention use of an arrangement in which the switching process is initiated while the barrel-shaped spring is still has a vertical force component. Tone this point

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starting from the switching process takes place dynamically and the movable one Switching contact is instantly, aleo suddenly, moved through the zero position of the switching contact point a. Accordingly, the opening duration is in the zero position or in the vicinity of the zero position of the hold contact equal to zero, so the switch has greater electrical loads can accommodate. Acts when moving into the switch position the vertical force component of the barrel-shaped spring of the on the membrane 18 acting against force, and decreases when the central position is exceeded, i.e. when the angle between the tongue-shaped 'Heil 44 or the barrel-shaped Spring 56 and the rails 4o, 42 decreases. In other words, the barrel-shaped spring has an effective vertical force, which is a negative spring force, as that for the movement of the point of application against the force of the barrel-shaped Spring required force decreases when the central position is exceeded. This vertical negative force of the barrel-shaped The spring becomes more negative when the middle position is exceeded. Before switching, the system is in any one Point stable. At the moment of switching, the increase in movement of the point of application requires an increase in the spring force, which · is determined by the constant restoring force of the calibration spring; but at the same moment nimet dl « opposite force transmitted by the barrel-shaped spring and this decrease is greater than the increase in the calibration spring, so that the effective force is no longer counteracted by an opposing balancing force and the counteracting one The force decreases, so the toggle spring is calibrated

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quickly approaches the central position and moves beyond it such that the movable contact comes into the closed position. So by carefully selecting a small one The spring force of the calibration spring enables dynamic switching to be achieved, since the switching process in those points takes place, in which the decrease in the vertical spring force of the toggle spring is greater than the spring force of the calibration spring. Expressed differently! Switching takes place dynamically when the effective vertical spring force of the toggle spring or barrel-shaped spring - numerically speaking - is more negative than the positive spring force of the calibration spring. This means that the switch enters the switching division when the combined spring forces of the two springs become negative in relation to the shifting force. The difference between dynamic and mechanical shifting lies in the fact that with mechanical switching the decrease in the vertical spring force of the toggle spring is never greater than the spring force of the calibration spring before the position above the central position is reached. Once you If this difference is considered from the point of view of the spring forces, then this means that what is part of the state of the art mechanical switching is in no way based on a calibration spring and a toggle spring, which are so coordinated with one another are that the effective vertical force of the toggle spring becomes more negative than the force of the calibration spring.

The same condition also applies when moving to the toggle position. When in Fig. 3 of the drawing

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The switching division shown exercises the calibration spring on the üchaltzunge a downward force, and after the switching force resulting from the liembran is reduced the calibration spring moves the retainer downwards. When moving into the switchover position, the vertical force component of the toggle spring acts against the force of the calibration spring; but here i & t again the effective vertical spring force of the barrel-shaped spring is negative, so that the opposite The counterforce exerted by the calibration spring decreases after the central position is exceeded, with the negative vertical The spring force becomes more negative when the central position is exceeded. Before switching to the toggle position, these are Spring system and membrane force stable at any point; but if the reduction of the vertical component the barrel-shaped spring with a certain increase in movement is more negative than the positive force of the calibration spring becomes, then the system becomes unstable, whereby the calibration spring overcomes the effective force, so that dynamic switching takes place from one point before the position above the central position is reached.

From these explanations it can be seen »that dynamic switching takes place when the resulting spring force, which counteracts the shifting force, becomes negative. In other words: at this point in the holding process the spring force counteracting the switching force decreases, namely below a value that is necessary for a certain increase in movement is required ao that the this movement

909833/0512 bad original

evoking force external v / ird, where di:> Spring force when switching in the shift point is greater than that for one certain increase in movement required int the pig. 5 and 6 of the drawing explained in more detail.

In Pig. 5, the part between B and C means the increase in force when the switching point is reached. G is the maximum counterforce. When the movement is continued, i.e. when switching takes place, the spring force decreases in the direction of point D. The part Bl) the Switching curve is representative of the characteristics of a Switch with a single calibration spring, which the Switching process influenced. The switching curve when used a single calibration spring is the reverse part BD (Fig. 5). The meaning of the switching curve below, which is broken down into small segments, is explained below Explanations. When switching over, the spring force decreases until the switching point is reached, at what moment the barrel-shaped spring goes beyond the position above the middle layer and contributes with its force, trigger the switching movement and in no way counteract it. If one compares FIGS. 5 and 6 of the drawing with one another, namely the same movement of the diaphragm or the movement of the point of application, it can be seen that the switching process according to the two curves in one Points set in at which the contact pressure is still maintained. In other words, »the contact pressure curves rise to a high point, and then fall again.,

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from, but the itbnahine after the .tiinaetzen dee ociialtvorgangea Insofar as it does not take place gradually, alB calibrate the uchalter is in dynamic movement, this movement B being rapid and abrupt.

In the above description it was assumed that the calibration spring is immediately above the effective Acts. As a result, however, the maximum available breaking force while maintaining a dynamic switching movement extremely limited; around but in the area Remaining practical feasibility is one example modified Auafiihrim £; aform to be preferred. The maximum for Available switching pressure is determined by the buckling force of the spring, which in turn contributes to the spring force in a specific relationship. With a low spring force or spring constant, is the buckling force, i.e. the maximum Force before the spring buckles, far too low to be used in conjunction with push buttons which are in Devices come into use. If the calibration spring is moved in the direction of the clamping point of the switching tongue, the force of the spring itself can be increased without the dynamic To influence the switching process, if the spring, for example, by half the distance between the clamping point and the point of application is moved, the movement of the spring is reduced by half, so that the spring force can be quadrupled without changing the effective spring force acting at the point of application.

9 0 9 8 3 3/0512 construction original

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A fourfold increase in the spring force multiplies the Buckling force four times, which means that the effective Buckling force (maximum available switching pressure) is doubled at the point of application, so that when the calibration spring is moved in the middle position between the clamping parts and the point of application, the maximum available shifting force is doubled, without this, however, the effective spring force which the Shifting force counteracts, is changed or the advantage of dynamic shifting is lost. It is clear that too other positions between the switching points and the clamping parts with corresponding increases in the spring force the force that comes into play at the point of view, possible are.

If the calibration spring is arranged in such a way that it acts directly on the switch tongue, the switch tongue would be stressed and be bent. For this purpose, a pivotably mounted lever 79 is preferably provided, which is used to prevent a deformation is arranged between the calibration spring and the switch tongue. The spring 74 uses this against the adjusting screw 76, which is screwed into the threaded hole 8o of the housing 12. On the opposite On the side, the spring 74 is supported against the lever 79. One end of the lever 79 is hinged to a pin 45, and the Lever 79 lies between the flanges 82 and 62 of the pin 58, so that the connection with that for the movement of the membrane 18 provided pin is produced. When the calibration spring is in the middle between the point of application and the clamping point

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the circuit arrangement, can be a satisfactory A maximum holding pressure can be achieved. laughs at the pretense the spring 74 actually determines the maximum stop pressure as well as the all-round pressure, the differential pressure is swisohen dem Schaltdruok and the changeover pressure when the spring 74 is set will. In some cases it is undesirable to have one pre-selected Switching pressure su have, which is within this more or less fixed differential pressure. IM the opportunity create a separate change in the soalt pressure and the ümsohaltdruckes su, a further spring 76 inserted. This spring 76 acts against a pin 9o equipped with a head, which under the action of the Spring 76 braces against plate 92, the latter being the limit represents for the movement of the spring 76 naoh below. The cone 9o has a downward stick against which - As can be seen from Fig. 3 - the pin 58 applies so that the force of the spring 76 counteracts the effective force. In practice, this leads to one of the two springs 74, 76, the opposite effect of the circuit, while only the spring 74 is effective when switching. As from Fig. 4 the drawing shows, is the position in which the actuator has come up and is against the with has applied a head provided pin 9o, indicated on the left part of the illustrated Druckeohalters. Act in this position both springs 74, 76 counteract the effective force and the two springs must be dimensioned so that their combined effective spring forces fall in the region described above. In other words, that means that they are not that big

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Need to be sized that prior to moving the toggle spring to a position above the central position, the numerical one The spring force of this toggle spring cannot be greater than the combined positive force of the two springs. Hit another Words; the spring force of the springs 74 and 76 must be sufficiently small so that the negative spring force of the toggle spring combined spring force of the two springs 74 and? 6 predominates before the switch moves beyond the middle position. at of the arrangement according to the invention, both springs 74 and 76 can be adjusted separately and also tensioned to the desired Switching pressure and switching pressure to be obtained. Through this Arrangement, the desired operation of dynamic switching is maintained} there is also a practically maximum switching pressure sur available, and the switch pressure is of the switching pressure independent, so that the available stop-shift differential pressure increases. In this way, there will be another glorification the sum of state-of-the-art pressure switches avoided. This Unsuträgliehkelt lies in the fact that the known holdings of this kind have great differences in pressure between them Hold pressure and hold pressure at high pressures in this respect could not be reached than when lifting the hold druoke at the same time the ümschaltdruok is raised with, whereby the difference pressure actually remains unchanged.

As shown in FIGS. 1 and 4 or 5 and 6 ersiohtlioh, move When the pressure rises in the pressure chamber 2o, the membrane 18, the pin 58 and the sung-shaped part 44 move upwards. This downward movement continues when the on the rise

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Diaphragm 18 acting pressure continues. Fig. 5 shows the Course of the force acting against the movement of the membrane; on the other hand, FIG. 6 shows the course of the holding pressure, which acts against the movement of the membrane. Both figures peculiar to both switching and switching operations. 5 discloses in addition, the course of the switching druoke for «switching or Switch. Because of the dead passage swisohen the pin 58 and the pin 9ο only act during the initial movement Spring 74 and the vertical force component of the toggle spring counteract the shifting force, the shifting cam being the one shown in FIG and 6 takes the course indicated. If the spring 76 were not present in this system, and if the spring 74 were in the above indicated parameters would be designed, the switching process would be in point C or in the point of maximum switching force - starting from the membrane - take place. As from a comparison of the course of the curves in Flg. 5 and 6, if there is sufficient holding pressure at this point, which provides an appropriate switching pressure for switching ensures large electrical loads. But if the spring 76 is used, the effect occurs already in the vicinity of the Point C on, whereby switching is prevented until a higher pressure is reached. Vaohdem the spring 76 in the System is introduced, a further consideration may be given to operating from point E along the switching curve according to Fig. 5, are employed.

When the point C is reached, the pin 9o can have a certain distance from the pin 58,

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βο that the switching movement of the switching tongue with the hand in hand going decrease of the switching pressure takes place to the point D, where the pin 9o is touched. The switching force acts in point D additionally counteracts the force of the spring 76, and returns iu dee Point £ back. In Fig. 4, the switching mechanism 24 iet in a Location shortly before switching bsw. shown in an operating state which corresponds to point E of the switching curve. Tone that Starting from point £, the switching force increases, with basically no movement of the membrane taking place, as is the case with rectilinear part of the switching curve is indicated. A relative constant switching pressure is maintained until the required switching force is reached at point F of the switching curve, whereupon a dynamic switching starts with a sufficient »switching pressure I (Fig. 6), thus a relatively high electrical Load can be absorbed. The shifting force decreases after the switching process has started, as the vertical component of the knee joint switch becomes smaller in the direction of the position beyond the central position, whereupon it reverses its direction of rotation and acts in the same direction as the switching force.

After switching, the switching mechanism 24 assumes the switching position, as shown in FIG. 3 in connection with the Switching mechanism 26 is tilted. The following now describes the switching of the switching mechanism in connection with the switching mechanism 26 explained. When the pressure in the pressure chamber 2o falls, the switching force of the diaphragm decreases, with the springs 74 * and 76 * the pin 58 · and the "lung-shaped part 44 *

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press naoh down. If the holding force becomes smaller, the springs 74 * and 76 * expand, and the vertical force component of the toggle spring counteracts the springs 74 * and 76 *, but eliminates a negative spring force. Even as the holding force decreases, the membrane and the slightly shaped part 44 move near the bottom, the holding pressure falling and the vertical force component of the toggle spring relative without it, aleo progroseiT, decreases. This change in the spring force dea 8oha.ltdruekes as well as the holding force actst see below the point O of the Umsohaltkurve (Fig. 5). Ei ^ h the pin 9o * rests against the stop 92 * and becomes ineffective as a result. When the spring 76 * _t, the system leave the 8ohaltkraft decreases merklioh, wherein as well as germs of movement of the diaphragm takes place, until the Umeohaltpunkt H reached on the curve the more maintenance ~. Basically changing takes place in the dsm point at which the decrease in the tertiary force component of the toggle spring exceeds the spring force of spring 74 *, so that with a certain increase in movement the resulting force of the tertiary component of the toggle spring and spring 74 'is greater than the increase the movement in this point would correspond to «whereby the switch is brought out of the Olclehgowloht. after switching takes su as holding force, naehdsm then all spring forces in tsr act in the same direction. About the function of the changeover course, the switchover starts at a point in which there is an essential balance pressure. Up to vertical lines of the switching and reversing curve in Fig. 5 are sum better

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staggered; but it should be pointed out that in practice these two currents are actually suaamuenfall.

In the double-spring arrangement, the springs 74 and 74 * the UaischaltdrUoke firmly, while the Schal tdruok through the Combination of springs 74, 74 * and 76, 76 * fixed wire.

A suitable choice of the load of the fmna-shaped spring and the spring force of the calibration springs (springs 74, 74 'for alone or 74, 74 * siad 76, 76 · in combination), can be a improved mechanically as well as electrically Switching can be carried out. Switching takes place with a sufficient switching pressure, so that higher electrical Loads sugelaae «a can be. The service life is also increased and the switch becomes more stable because it is less sensitive to shocks and vibrations. In addition, through appropriate Choice of spring force the spring forces at a maximum permissible load on the barrel-shaped spring, i.e. at a maximally relaxed and still guaranteed dynamic So hold, a minimal Sohalt and Umaehalt Differensdruok achieved will.

It is also desirable that only mow the liyeau of the switching and ümsohaltdruokes of the switch is changeable} but in the case of one look, the pressure should not work two-level or multi-level print holder, mini-ales and maximum differential pressures of the sehaltdruökee and the ümsohaltdruckes of the two switches can be reached. So far have

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Doppelsohalter, which work with a double pressure level, is not satisfactory insofar as the change in the switching or reversing level of the one failure has influenced the leveling or reversing level of the other switch. why the control over the biffing drive of the stop and stop pressure from the counters was lost. A further object of the invention is to provide a precaution which separates the two sun switches of the independent adjustment from one another. To achieve this, the levers 79 and 79 'are used in conjunction with the stops, which limit the stroke of the switches in both directions of actuation. In the embodiment shown in the reward, the stop is formed as a carrier in one direction τοη surfaces 94 and 96 of the housing 12, and in the other direction τοη plates 32, 32 *. The holding and holding pressures of the holding meohanlseus 24 are preferably greater than those of the switching meohanisau * 26, and thanks to the arrangement of the stroke limiter on the gearshift lever, the adjustment of the one switching position does not influence the other position, and it does not affect the ratio as long as the ratio swlsohen the corresponding circuit UfeaQhalt & rttoke »» uX is maintained and all differenK-drtioke of these »« i & en pressures are not below a predetermined MinisAX value, sB 7.5 se WS to »17.5 m WS off« _f if ■ aa eimukl from el & iKr t7jiscö.en
timg

Xft den fälXem, i »wilalM» IeAIfIIeIi lAll1 »rt« r £ ®dersi 74 and 74 'used vey & sn, wirÄ der üteao & altAraok doroh be

Movement of the contact 3o relative to the contact 28 changed. In order to realize this movement, the Klesnen plates 34 and 34 * are made of elastic material. You are at one end with the housing 12 via rivets 36 and 36 * in connection, while against the other free end see the set screws 93 and 98 * apply. These adjusting screws 98 and 98 * place against the Klenaenplattan 34 and 34 * * η * ue increase the contact distance su bsw. Reduce su and loosen the Kiesmenplatten ao su so that they can perform a movement due to their elasticity. In the cases in which a double calibration spring is used, a fixed contact distance can be set by handling the screw caps 98 and 98 *. The springs 74 »74 * and 76, 76 * can be adjusted by handling the threaded bolts 78, 78 * and 88, 88 *, so that the pressure level for switching, for example. can be changed for the circuit.

»Claims 909833/0512

Claims (7)

1. Snap switch, ait a contact-making αϊled and an operating member, each of which a rocker spring is arranged is what a movement of the contact-making member τοη of one position causes in one another position, this toggle spring d & s the contact receiving member in a holds the two positions and causes the contact receiving member τοη one position moved to the other position If the toggle spring goes beyond the middle position, a link becomes old, welohea on the su actuating link into one Point exerts a force, furthermore a spring Torgeeehen let, which exerts a force counteracting this force, marked by the fact that the forces the toggle spring (56) and the counteracting spring (74) are dimensioned so that their combined spring forces negate beror the toggle spring (56) goes beyond the central position. 2. Switch according to claim 1, wherein the receiving the contact Member and the actuating glle ^ are pivotably mounted, characterized in that the counteracting Spring (74) «wipe the point of application (A) and the pivot point of the actuated link in a tone of voice Part (44) is arranged. 3. Switch according to claim 2, gekennseiohnet by a pivotable lever (79), which swlsohen the counteracting spring (74) and the actuated member in the shape of an unshaped part (44) is arranged. - A 2 - 909833/0512 4. Switch according to claim 3, characterized by limit stops (32, 94), which the movement of the lever (79) in both directions. 5. Switch according to one of the preceding claims * characterized by a further counteracting JP; the (76) and a dead gear connection (at 82, 9o) between the actuated link and the second counteracting spring, the «wide counteracting Spring becomes so effective that it counteracts the shifting force, before the contact-making member moves from one position to the other, which becomes ineffective, before the contact-making member causes movement in the opposite direction. 6. Switch according to one of the preceding claims, with one fixed switch contact, one Umsohaltkontakt and one on Pressure-responsive membrane for moving the actuated member, characterized in that the changeover contact (34) is movable in such a way that the Umaohaltdruok of the switch is changed * 7. Switch, consisting of two snap-on holders and a membrane for actuating both snap-action switches, according to claims 1 to 6, characterized by <* in bridge link (6o), which is articulated with the actuated link% \ §r each son snap switch and old the membrane is. 909833/0 512