DE2102218A1 - Snap device - Google Patents

Description

DR. BERG DIPL.-ING. STAPF

PATENTANWÄLTE β MÜNCHEN 8O. MAUKRKIRCHKRSTR. 48

Df. Br g Dipl.lnq. Stuffing I MOnditn M. Mnuarkirdiarilrafl «45

Your Z «! Di« n

Your Sdinlbtn

2.M «

VI / Kr 20 545

J _3n . 1971

Anwal'oBakte 20 545

Theodore Y. Korsgren
Orange, Connecticut / USA

Snap device

The invention can and will be used to advantage particularly in the field of electrical snap-action switches therefore on the basis of preferred embodiments of such devices described. There are multiple supervisors of Schruipp shoulders known, which are generally a spring cedar leaf of essentially rectangular shape,

109831/1959

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COPY BAD ORIGINAL

which yen'ormt in the longitudinal direction of its great extent is held. The £> c.ialter has a middle actuator strand in such a way that the spring leaf, the ends of which are retained when the actuator is moved snaps across from one bulging position to the opposite one ..

Such arrangements have in various switch devices where a snap-over is required wide area of application found. However, these spring springs have a disadvantage, which is the usability limited. When the springs are actuated, they stir their ends are not necessarily parallel and there may be inclinations between the ends of the spring leaf a come. This possibility sets the degree or the probability the stability of such switches decreases. The currently known switches of this type also prepare Difficulties in their assembly in that the peder blade and the actuating member are not mutually exclusive hold themselves if they are not in the housing.

The invention avoids the disadvantages and limitations this known switch and creates a permanent snap action switch with a pair of Kontaktendeji, which

-3-

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COPY

symmetrical with respect to an actuator or can be arranged asymmetrically (the latter around a greater movement of one end of the switch compared to the other to enable), and which can also be arranged in this way can that the otherwise acting as an actuator part is held firmly and one end of the sheet due the actuation of the other jL'ndes changes.

These results are achieved in that a leaf member of generally rectangular outline is provided as the spring spring with essentially parallel arms which terminate at one of their rjiden in contact parts. In an ordinary symmetric Ausfünrun ^: in the Anwendunr ale Ooppelschalter a 3etätigungs _£ rlied is mounted such that the arms of the L3lattgliedes are claimed both train as the outside in torsion to the blade member. This stresses the leaf limb in such a way that, in the construction described, one end always moves symmetrically to the other and the leaf limb jumps around from one bulge to another. In addition, the construction is such that the actuator-blade assembly remains self-retaining.

The invention thus becomes a new and improved one

BAD ORIGINAL 10 9 8 31/19 5 9 _COPY

Spring spring construction created.

The invention also provides a new and improved one Spring spring construction of increased durability.

Furthermore, the invention provides a new and improved spring structure which uses a leaf member which is subjected to both tension and compression as well as torsion, so that increased stability during operation is achieved.

The invention also includes new and improved snap switches and an improved method for their manufacture.

The invention is intended both in its structure and in its mode of operation together with further features and Advantages are explained in the following detailed description with reference to the drawing.

In the drawing shows:

Fig. 1 is a plan view of a blade member according to the invention,

109831/1959

_ 5 -

! ig. FIG. 2 shows the top view of the blade member according to FIG. 1 with the intermediate member inserted;

Fig. 3 is a view in the plane of the line 5-3 of the! Igο 2 on an enlarged scale,

Pig «4 is a view of the arrangement according to FIG

Leaf member in one stable position, (ti

Fig. 5 is a view of the sheet of Fig. 2 with the sheet member in the other stable position,

6 is an exploded perspective view of a Switch according to the invention,

7 and 8 are views of a blade member according to FIGS. 2 and 5 in a double-switching arrangement

1 voltage in different switching states,

FIG. 9 is a perspective, partially sectioned view of another snap switch according to FIG Invention,

10 shows a section through a further snap switch according to the invention,

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FIG. 11 a section along the line 11-11 in FIG. 10,

Figure 12 is a partially sectioned view through one further switch according to the invention,

Pig 13 is a view of another snap switch according to the invention from below,

14 shows a section along the line 14-14 in FIG. 13, 15 shows a section along the line 15-15 in FIG. 14,

16 shows a section through part of a switch let the invention and

FIG. 17 is a view along the line 17-17 in FIG.

The blade member 10 shown in Fig. 1 according to the invention is of substantially rectangular shape and runs spaced apart side strips 11 and 12 each having spaced apart arms 11a, 11b, 12a, 12b form and at one of their ends are connected by end parts 13 and 14, respectively. From the side strips extend midway between the ends Projections 15 towards each other, which edges 16 on-

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white that maintain a distance d1 when the spring 10 is in the relaxed state. The edges 16 can be relieved by recesses 17 (shown in broken lines), which a substantially form circular opening. This allows the use of a conical screw (not shown) to tighten the To push projections 15 apart.

The blade 10 according to FIG. 1 is made from a flat piece of metal. The outer edges of the side strips 11 and 12 run towards their middle areas in the height of the projections 15 out slightly converge, where they at 18 in a Curvature merge into one another. The sheet according to the invention is in one piece and can be punched, pressed, etched or produced in some other way from a flat, flexible sheet metal.

The sheet 10 is provided with a part 19, which is hereinafter referred to as the intermediate member 19 «Das Intermediate member can be used in one version as an actuator and in another version as a support or Find bearing part use. As can be seen more clearly from Figure 3, the link 19 is on opposite sides provided with notches or incisions 20, which hold a rope of the projections 15. The edges 16 of the

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Projections 15 are preferably held on the flattened base of the notch 20. The notch 20 has flanks or Side surfaces 22 and 23 'on which the projections 15 abut and which also limit the movement can form. Bs has been shown that an angle of approximately 30 degrees between the flanks is advantageous.

The bottom 21 of the notch can also be used in another way be formed, for example, curved in a radius complementary to the profile of the edge 16 of the projection 15 get lost.

The bottom of the notches 20 is dimensioned such that the edges 16 of the projections 15 at a distance d2 printed apart. This causes the side strips 11 and 12 to be pressed apart, which are the effective Length L of each arm part is increased on both sides of the projections 15, while each of the arm parts increases its outer end is held by the end pieces 13 and 14. This pushing apart causes further a torsional stress in the blade 10. In the embodiment according to FIG. 2, all arm parts have the same length L and therefore the torsional stress is in all four arm parts the same size »

-9- 109831/1959 ΒΑί> ORIGINAL

This "tension" causes the sheet 10 to twist, as can be seen more clearly in Figures 4 and 5. The intermediate member 19 can initially be inserted and removed by bending the strips 11 and 12 by moving the edges 16 of the projections 15 out of the same plane be brought between the edges 16 until the projections 15 are held in the notches 20.

This design allows the sheet to be in your holder underneath to hold all conditions self-retaining and greatly facilitates the installation of the snap device in one Casing. This self-retaining pre-assembly reduces the overall time required to assemble a complete switch, as shown in Fig. 6, for example, is significant.

An embodiment of the invention as a double contact snap switch is shown in FIG. 6. The switch 30 according to FIG. 6 has a substantially cylindrical housing 30a with end walls 31 and 32 ″. The earth walls carry upper end links 33 and 34 and lower end links 35 and 36, which in the drawing are basically I-shaped and have contacts 37,38,39 and 40 which are suitable for Koxitakt delivery by the carried by the sheet 10 Kont'Jktstüclce 41 and 42 provided and attached are. In the end wall 32 there is a bore 43

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formed, which as a guide for an actuating tappet 45a serves. A pin 44 for holding a spring 45 extends downward from the upper wall 31 > the other end of which is seated on a seat 46 of an intermediate member 19. The intermediate member acting as an actuator 19 can at its upper end - as shown by the seat 46 and the projection 47 - to support the spring 45 be trained. The spring 45 acts to reset, as will be described below. The projections have an advantageous effect 44 and 47 together to limit the stroke of the intermediate member 19.

The connecting members 33 »34» 35 and 36 point through slots 50 in the respective end wall protruding legs 49 which are fastened in the slots keeping the contacts 37 to 40 at the correct distance. It can of course other constructions for attaching the connectors to the housing can also be used. The construction of Switch housing is known and is not required here for an understanding of the invention.

In Fig. 6, the sheet 10 is shown in the snapped up position in which under the pressure of Spring 45, the intermediate member 19 is in a lower end position in the stop on the housing and the contacts 41, 42 on

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contacts 37 and 38 are in contact.

If the staff or an operating tactile device If the link 19 is moved upwards via the rod 43a against the force of the spring 45, the contact pieces 41 and 42 not with, since they are in contact with the contacts 37 and 38, as is more clearly shown in Pig, 7, ^ and the movement of the link 19 then brings the projections 15, which act as hinge points, to over to snap the unstable middle position into the lower stable position according to FIG. Sheet 10 pops up this y / eise from the position according to Pig. 4 in accordance with Pig. 5. The contact pieces 41 and 42 snap over to the contacts 39 and 40, since the stroke of the link is dimensioned accordingly between its two end positions. When the rod 43a is released, the link 19 becomes printed downwards by the energy stored in the spring 45, as shown in FIG. The contact pieces 41 and 42 now rest on contacts 39 and 40 and are restricted in their movement by them. With continued Movement of the member 19 under the force of the spring 45, the sheet 10 jumps out of the position of FIG into the position of FIGS. 4, 6 or 7. Of course, the spring 45 must be so strong that it is a Can trigger jumping of the sheet 10.

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In this way, the sheet 10 jumps back and forth between the operating positions when its end regions in a Direction in movement are restricted, and the limb is moved a certain amount in that direction, so that the posts 15 snap over the middle.

The sheet under tension of the type described so far has only two stable positions and must adopt either of these positions due to the tension in the arms and their joints., The two The ends of the sheet must always snap in the same direction because of the tensile and torsional stresses in the arms. When moving from one operating position to the other, the Sheet 10.

The sheet 10 is here of course made of a conductive material and includes an electrical one according to FIG Circle between the contacts 37 and 38 or the contacts 39 and 40. The positive bi-stability of the sheet or the spring 10 ensures that there are no inclinations and crossed contacts caused thereby between the contacts 37 and 40 or 38 and 39 comes.

So far, the invention has been applied to a

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two-pole switch for closing two circuits explained. Of course, a couple of the contacting End members 37, 38 or 39, 40 as electrical conductors are omitted and by stop surfaces or in addition suitable abutments are replaced. If, for example, the end links 39 and 4-0 have been omitted or no electrical ones Connections are made to them, the leaf IQ is normally under the influence of the spring 45 in its den Circuit closing position and the circuit may be terminated upon occurrence of any event by which the Rod 43a is pushed upwards, are interrupted. This type of application is suitable e.g. for circuits, which electric light should be switched on when a door is opened. For use in one Starting circuit, contacts 37 and 38 can be omitted or not connected to an external circuit. The blade 10 then closes a circuit between the when a force is applied to the plunger 43a Contacts 39 and 40 as long as the required pressure is exerted on the holder 19 by means of the plunger 43a.

The invention can also be used with other snap-on devices and when the holder is held stationary and an actuating force is applied to one end of the sheet.

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The switch arrangement according to FIG. 9 comprises a spring or leaf member 60 similar to that shown in FIG. 1, which on an intermediate member 61 as in FIG shown is attached. This forms a continuation of a connecting terminal 62. The connecting contacts 63 and 64 are in a housing 65 made of insulating material a ^ ιf ~ taken, which has an end wall 66. The connection contacts 63 and 64 have contact parts 69 or 70, which are arranged at a distance from one another on each side of the end 71 of the sheet 60. At the end of 71 a contact 72 is attached to the blade 60. A spring 75 is provided on a projection 73 on the surface 74, which acts on the leaf 60 via a spring plate 76. The spring 75 causes the leaf 60 to become the illustrated Takes position.

An actuating button or plunger 78 protrudes through the end wall 66. When it is pressed down, it exerts a force against the spring force of the spring 75 on the end of the leaf. When the plunger 78 is depressed, the end 77 is urged downward against the spring 75 while the blade 60 is retained on the intermediate member 61. When the tensions in the blade 60 are reversed, it snaps into the other stable state and the contact 72 comes to rest on the contact part 70. if

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the force is removed from the plunger 78, the spring pushes 75 the thereby snapping sheet 60 back into the position shown.

In the arrangement of FIG. 9, the ends 71 'of the blade 77 are relative to the holder 61 is asymmetrically angeordnet.Dadurch upon application of an actuating force to the shorter end, as shown, at the other%

At the end an enlarged or intensified movement is achieved.

The spring 75 and also the spring 45 (Fig. 6) can be omitted, when a permanent deformation has been applied to the sheet in a degree of concavity. This can be done initially Inserting an intermediate member as shown in Fig. 2 and then heat treating the sheet can be achieved in order to put this in a state of permanent deformation in a degree of concavity. A yy

such a sheet always returns to the permanent deformation state when an operating force is removed from it will. Such a sheet can therefore be regarded as monostable.

An embodiment according to the invention in which the sheet is preformed is shown in Figs. A switch 79 contains a housing part 80

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with a cover 81. In the housing part 80 contact parts 83 and 84 are attached, the contact part 82 forms an intermediate member 85 to which a blade 86 is attached in the manner described above. One end of the sheet 86, which has a contact button 87, is for making contact with one of the contact parts 83 or 84 provided. The other end of the sheet 86, which may optionally have a button 80, is between an abutment 89 on the housing 80 and a stop piece 90 which is attached to the housing 80, locked in.

The sheet 86 was molded and attached to the intermediate member 85 and then heat treated to make it permanent To move the deformation state, as it is in Pig.IO is shown for example. Alternatively, the sheet can be subjected to the heat treatment at a first intermediate member and then transferred to the intermediate member 85. The degree of bias depends on the degree of strain applied to the sheet during the heat treatment. An actuator 91 has lugs 92 as The edges or marginal strips of the sheet 86 bear against the projections 93. A downward movement of the actuator 91 by pressing the button 94 causes the sheet to snap over into the position shown in broken lines.

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-IT-

Asked position according to FIG. 11. When the actuating force ceases, the preformed sheet jumps into the in position shown in full lines of Figs. 10 and 11 µm.

Big. 12 shows a further embodiment of the invention in cross section, in which the blade in one of its can remain in both stable positions. Sheet 96

is attached to an intermediate member 97, which as ^

Terminal contact can be formed, as in the Pig. 9 and 10 is shown. An actuator 98 has pockets 99 'in which the outer edges of the marginal strips or handles of the sheet 96 are held in the vicinity of the projections. The operating member 98 is provided with a recess 98a which slidably receives the intermediate member. With the actuating member 98, ending in a button plunger 100 is connected, which allows the sheet 96 in the sen a stable position to encounter difficulties for M or to move to the other. The (Jesamt case 101 and the cover 102 can be designed in a different way as in Pig.IO and can still be used as a double contact arrangement, so that a connection can be made from a central connection to external connections.

Reference is now made to FIGS. 1 and 2 and in particular to FIG. Fig. 2 shows in broken lines

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the areas of tension in the sheet in its center position when it snaps from one position to the other. Around the areas denoted by T there is generally tensile stress in the areas denoted by 0, compressive stress and in the areas denoted by S shear stress. It can be seen that with this stress distribution in the sheet, it is in a very unstable state and, depending on the direction of movement of the intermediate member, will snap from one of its stable states to the other.

In order to bring this stress concentration to a minimum, the degree of curvature is low or are Radii R1 and R2 kept large. The radius R1 and the opening behind the projections 15 also have the Purpose to increase or extend the effective length 1 in the arms 11a, 11b, 12a, 12b without the total length of the sheet to enlarge. This also allows the edges 16 of the projections 15 for additional stability to extend in attached to the intermediate link state. The extent of the? allowed stress concentrations any point depends on the stress, the design and the material of the leaf tea and the like Conditions. The sheet can therefore be designed depending on these parameters.

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In order to avoid all disadvantageous conditions due to the stress concentrations in the sheet, a resilient Intermediate link can be used, which contributes to the tension relief when the sheet snaps over. One An embodiment of the invention in which such a holder is provided is shown in FIGS. The aging mechanism according to FIGS. 13 to 15 can a housing 104 of substantially cylindrical shape with a lower closure wall 105, in which an actuating part and intermediate link base is guided. An intermediate member 106a is, as can be seen more clearly 15 can be seen, formed from a resilient material part in such a way that notches 107 for the projections 108 of sheet 109 arise. The intermediate member 106 a is supported in a recess 110 in the actuating part 106. Actuating part and holder base 106 have an upstanding part 110a which passes through the blade 109 protrudes and a spring seat member 111 is supported. The spring seat 111 is with an opening 112 for a upright portion 113 of the intermediate member 106a is provided. The mechanism also includes terminals 114 and 115 with contact portions 116 and 117, respectively, which are im Normally on the contact clips 118 and 119 at the ends of the sheet 109 are in contact. A spring is supported on the spring seat 111 and 'carries one at its other end

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further spring seat 121. The leaf 109 is normally in the position shown in FIG. However, if the holder base and actuation part 106 is moved upwards against the force of the spring 120, the upward movement of the intermediate member 106a causes the leaf 109 to snap over and the contact clips 118 and 119 to strike the lugs 122, which are or are not electrically connected electrical connections shown may be. When the actuating force is removed from the part 106, the spring seat part 111 causes under the force of the spring 120 when the projections 110a, 111 and / or the shoulders 123 of the intermediate member 106a are pressed down, this is moved downwards and causes the blade 109 again into the position according to ^ ¹ Ig. 14 snap through.

The holder support part and actuation part 106 are placed in order to prevent any rotational movement of the holder 106a. The member 106 may have a tongue 124 attached to it which slides in the groove 125 in the bottom closure wall 105 is held.

The elastic resilience of the intermediate member 106a allows it to be attached to the notches 107 during passage

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109831/1959 _omim .

of the sheet 109 due to its unstable position, as explained with reference to FIG. 2, to compress. This reduces the Stress peaks in the sheet and increases its life. When the leaf jumps through its central position, the intermediate member 106a is compressed at the notches 107 by the resilient properties, the resilient Compliance contributes to the snap action.

Another mechanism according to the invention is shown in FIGS. The mechanism according to FIGS. 16 and 17 corresponds to that of FIG. H with the exception of the parts which are shown differently. A housing 128 has a bottom wall 129 which includes an opening 130 through which an actuating member 131 is passed. The actuator 131 is provided with a recess or bore 131a, which is formed of 132 consistent with the Quersc.Hnittsabmessungen of Zwischenglie- * and flush receives one end of the intermediate member in itself. A spring or leaf 133, as previously described, is attached to the intermediate member 132. At the upper end of the intermediate member 132, a cap-shaped part 134 with a spring seat is held on the protruding hand 135, on which a return spring 136 is supported. The seat 134- forms a recess or bore 137 which corresponds to the cross-sectional dimensions of the intermediate member

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is designed. This creates an ir.i essential solid Connection between the intermediate member 132, the; Betiiti member 131 and the part 134 achieved so that a ^ e,; Twisting or tension between the parts is prevented. The actuating part 131 is in a predetermined position relative to the housing 128 by a or several springs 138 held on the part 131, which are guided in hats 139 in the bottom wall 129.

The leaf 133 snaps into its other stable position when a certain force is exerted on the actuating lever 131 acts. When the force is withdrawn, the spring 136 acting on the part 134 presses the intermediate member 132 down and the sheet 133 snaps back into its initial position.

To implement the invention, the leaf or the spring is formed by one of the methods described above. Suitable materials are eg ^ 25 beryllium copper and 17-7 Ph stainless steel, as well as spring materials, which are known under the names Havar and JDlgilloy and have a relatively high cobalt content. The formed sheet is then subjected to a heat treatment. In the case of 17-7- -0 stainless steel may be exposed to a temperature of about 482 ⁰ C for one hour.

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When it is desired to form the sheet as a monostable construction, it is subjected to V. ^r äriaebehandlung on an intermediate member.

Ledi.clic, for example, has spring springs with a Total length of about 16.5 mm and a width of about 4.7 mm in thicknesses of 0.1 and 0.15 miu made of stainless Made of steel and ueryilium copper. The dimension d1 was approx. 0.25 mm and the dimension d2 was up to 0.9 mm, which corresponds to a spreading ratio of 3.5 to 1 . The length of the edges 16 was about 2.8 mm. This is much larger than the dimensions d1 and d2, whereby greater stability is achieved.

The aforementioned dimensions are only for the sake of clarity indicated to the dimensional relationships of the formed in accordance with the invention To explain the sheet. The dimensions of each individual sheet and its holder are determined by the Conditions of the circumstances in which they are to work and through the punctures they are to perform ", bostir.rr.t.

Di η Zv / j rjohen .- 'songs are preferably composed of a four-

with the notches described in opposite

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BATH ORIGINAL

lying sides formed. However, any intermediate link construction, which can be attached to the blade in a stable arrangement is used. For example, a double-threaded conical screw can be introduced into a recess 17 (FIG. 1) so that it can be grounded the desired degree of tension is created in the sheet.

While several embodiments of the invention have been disclosed with modes of application for the invention, the illustrated features of the invention for a switch construction of a given type of application together be combined. The versatility of this spring construction is given by the fact that the leaf in a symmetrical design only as a device interrupting a circle with a movable or fixed intermediate member or used in a double contact arrangement v / earth, in which in turn the intermediate member may be held either movable or stationary by an actuator, the actuating force being applied to the sheet.

Further, the sheet can be used in asymmetric form, one arm longer than the other is ₀ sol addition, the intermediate member may be conductive and form a part of a contact terminal or with a

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must be electrically connected.

The invention is not restricted to use in electrical devices. It can be used in control systems can be used with a pneumatic, fluidic or hydraulic structure. To achieve the The desired result, as well as mechanical forces, can be a fluid pressure on the blade or the intermediate member be applied.

In summary, the invention creates a spring structure with a substantially rectangular flat sheet having side strips which are attached to connected to each other at each end. Inward projections or projections extend from the side strips Support areas. A self-retaining intermediate member is inserted between the projections to turn the sheet into one to put such a state of tension that it is one of assumes two stable states and moves snapping between the two states.

Patent claims:

109831/1959

Claims (18)

Patent claims: l.y snap device, in particular snap switch with a substantially flat sheet member which is spaced apart at each end by end portions having interconnected side strips, and with an intermediate member which extends within the perimeter of the leaf member, characterized in that the side strips (11, 12) are transverse to their longitudinal direction are much wider than thick, and that the intermediate member (19) with the -l-inner edges of the side strips (11,12) is in engagement and this pushes apart transversely to their longitudinal direction in such a way that in them one a concave shape of the blade member (10) generating tension is created. 2. Snap device according to claim 1, characterized in that that the side strips (11, 12) are arranged between their ends and projections facing inwardly towards one another (15) and that the intermediate member (19) for spreading the edge strips (11, 12) on the projections (15) attacks. 3. Snap device according to claim 1 or 2, characterized in that the intermediate member (19) opposite one another -27- 109831/1959 has overlying notches (20) in which the inner edges of the projections engage. 4. Snap device according to claim 3, characterized in that that the ^ heirs (20) are essentially V-shaped and their base is essentially complementary designed to the inner edges held in the notches and is sized. 5. Snap device according to one of claims 2 to 4, characterized in that the projections (15) substantially have parallel, spaced-apart edges (16). 6. Snap device according to one of claims 2 to 4, characterized in that the length of the edges of the projections (15) engaging the intermediate member (19) is substantial is greater than the distance between the edges. 7. Snap device according to one of Claims 3 to 6, characterized in that the planks (22, 23) of the notches (20) enclose an angle of about 30 ° between them. 109831/1959 8. Snap device according to one of claims 2 to 7, characterized in that the projections (15) between their mutually facing edges (16) and their connection are constricted on the side strips (11, 12). 9. Snap device according to one of claims 3 to 8, characterized in that the intermediate member (106a Fig. 15) is so resilient that it is when Jump around the blade member (10) elastically deformed between its end positions. 10. Snap device according to one of claims 1 to 9, characterized in that a housing part is provided, in which the snap device is arranged for jumping between two positions, and that an actuating device (43a) for applying an actuating force to the intermediate member (19) or the blade member (10) is provided through which the leaping of the blade member between its end positions relative to the housing part is triggered when the intermediate member (19) of the blade member (10) is moved. 11. Snap device according to claim 10, characterized in that the intermediate member (61) fixed to the housing part (65) is held and the actuating force for triggering the jumping over of the blade member (60) on one (77) of the latter Attacks ends. 109831/1959 " ²⁹ ~ 12. Snap device according to claim 10, characterized in that that the intermediate member (97) is firmly attached to the housing part (101) is held and the actuating force for triggering the jumping over of the blade member (96) on the projections attacks 13. Snap device according to claim 10, characterized in that ^ · net that the intermediate member (19) is movable in its longitudinal direction, that the housing part (30) at a distance from one another on both ends of the blade member arranged stops (37> 38,39 »40) and the jumping over of the Blade member (10) can be triggered by applying the actuating force to the intermediate member (19). 14. Ski app device according to claim 13, characterized in that that a spring (45) supported on the housing part (30) and acting on the intermediate member (19) is provided, which when the snap device jumps over by a force acting on the intermediate member (19) stores so much energy that the leaf member springs back under the action of the spring when the raft does not acts more on the pontic. 109831/1959 15. Snap device according to one of claims 1 to 14, characterized in that each of the side strips (11, 12) of the blade member is curved in one plane when the blade member is relaxed and the point of curvature (18) facing essentially the center of the curvature of the other side strip. 16. Snap device according to one of claims 1 to 15, characterized in that the intermediate member (19) has a substantially rectangular, flat side of four formed cross-section has (Fig.2) that the notches (20) in two opposite sides of the intermediate member (19) are located and that the projections (15) have straight free edges which are held in the notches (20) are. 17. Snap device according to one of claims 1 to 16, characterized in that the intermediate member (106a) between the contact lines of the projections is resilient (Fig.15). 18. Snap device according to one of claims 1 to 17, characterized in that the sheet member (10) consisting of spring plate is in one piece, that the side strips (11,12) of the same have a length that is a multiple -31-109831 /1959 of the distance between their one of the edges facing away from each other "and at their ends by transverse webs (13,14)
connected to each other that are wider than that
Side strips that the side strips, the ridges and
the projections 15 are many times wider than that
Sheet thickness is, and that the corners between the webs and the side strips and between the side strips and the projections are rounded. 109831/1959