DE1665376A1 - Snap switch - Google Patents

Description

5680-67; Dr.Sd/Bru

U.S. Serial No. 567 495

Filed: July 25/1966

Malcolm Kiugsley Parkhurst, New York, N.Y. (V.St.A.)

He gets a snap

The invention relates to an electrical switch with snap action.

One purpose of the invention is to provide a snap switch specify the reliability of the contact with regard to the mode of operation in the event of a malfunction the mechanical resistance, the simple structure and the small size, as well as a simple one Manufacturing is superior to the known switches.

In addition, the invention is intended to enable a Snap action in a standardized subminiature switch, i.e. in a packet-shaped switch with the dimensions 12.7 mm. 5.05 mm. 9.9 mm (0.5, 0.2, 0.39 inches) with the above to achieve the properties mentioned.

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Another purpose of the invention is to provide a snap-action switch based on the principle of construction disclosed in US Pat. No. 2,699,512 of 1}. December 12, 1956 (issued on August II, 1959).

According to the invention, the use of a toggle lever and a toggle spring arrangement for establishing contact between the end of the toggle lever and a mating contact is proposed, whereby these two contact halves make a squint movement should perform against each other and should also v / earth a force exerted on the toggle lever in the actuation direction. Of the Toggle lever is practically rigid and is perpendicular to the direction attached to the toggle spring. The resistance of this latter direction is used to squint between the to generate both contact halves in order to avoid welding of the contact halves.

According to the invention, a toggle lever or a another snap-action body stamped or otherwise formed from a rigid strip of precious metal, i. e. for example embossed, with the metal strip lying in the direction of the toggle pivot point, and the contact from the toggle will be carried.

In addition, according to the invention, a toggle lever is attached to a rotatable support. The stops that make the rotary motion of the carrier, serve at the same time as secondary

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close for the knee lever, so that the ■■ main flows the knee lever only measured during the operating times "

In addition, a fixed contact arrangement is provided according to the invention, multiple contacts sliding one on top of the other and stops, for "- contains the movement of the snap link. These Components are particularly space-saving and are suitable for use in subminiature switches and in other switches, at w for whom it is advantageous to avoid very small tolerance limits. .

Furthermore, according to the invention, there is a fixed contact Provided for a switch that closes when the loop is excited, In the case of vreleHem, the parts are arranged in such a way that the critical ones Contact Hache can be produced by compression molding and with what great accuracy between this surface and the moving contact can be ensured by simple and non-critical steps during assembly. do

Finally, according to the invention, the combination becomes all above mentioned features in one. Subminiature switch proposed.

In the following a preferred embodiment of the egg ¹ invention will be described.

Figure 1 shows a vertical section along the plane 1-1 of Figure 3, ^:

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FIG. 2 shows a vertical section along the section plane 2-2 in FIG.

Figure 3 shows a horizontal section along the cutting plane 3-] 5 in Figure 1.

Figures 4 and 5 are perspective views of the rocker arm in Figure 1.

FIG. 6 shows an individual part on an enlarged scale the rocker arm assembly.

FIG. 7 shows a cross section through the starting material from which the rocker arm release is made.

Figures 8 and 9 show a plan view and a side view of the rocker arm part during its molding process.

Figure 10 is a side view of the nearly completed rocker arm portion.

Figure 11a, Figure 11b, Figure lic and Figure lld are representations of the switch in different operating states.

Figure 12 is a perspective view showing the shape and illustrates the mutual position of the fixed contact to the rocker arm part.

The housing 10 (Figure 1) of the embodiment to be described here corresponds to the dimensions of the standardized above

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SubminiatursGhalterers and has three terminals, namely the common terminal 12, the normally open terminal 14 and the normally closed terminal 16 (Figures 1 and 12).

The common clamp 12 is connected to a U-shaped bracket which carries a hinge pin 20 around which a carrier body 22 can be rotated (see also FIG. 4). On the horizontal part of the support body 22 there is a stiff knee joint 26 _Λ which has a contact surface at its upper end.

According to Figure .4 to 6, the rocker arm 26 has a rounded one Support surface 30 with axis A resting on the conductive plate 22a of the carrier 22 rests. Furthermore, the rocker arm 26 still has two downwardly extending lugs 32 (FIG. 6), each located on its two vertical edges, which engage in corresponding openings in the plate 22a. The top of the rocker arm sits between two fixed ones Contacts 34 and 36 (Figure 4) and the rocker arm is through a Toggle spring 38 pressed against the plate 22a. The toggle spring 38 is with its upper end in an opening 40 of the rocker arm attached and with its lower end to a pin 42, the extends perpendicular to the axis A below the plate 22a.

The carrier 22 has an upwardly extending shoulder 44 on which an actuating button _{with the lever arm M 1}

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attacks and the one with the considerably longer lever arm Mp die Stops 48 and 50 (Figure 12) touched.

According to FIGS. 1 and 11a, the actuation button 46 is arranged in such a way that that the carrier 22 can rotate about an axis 18, and thus the extension 44 and the contact surface 28 of the rocker arm can move in the direction of arrow Z (Figure 11a - c).

The fixed contact 34 runs with its contact surface at an angle Y (Figure 11a) to the direction Z, so that when the carrier 22 and the rocker arm seated on it move 26 in the direction Z, the fixed contact 34 deflects the rocker arm 26 in the direction of the arrow D (Figure 11a) until the tilted position is reached, i.e. until opening 4-0, in which the toggle spring is attached (Figures 4 and 5)> reaches a plane which passes through the axis A and through the attachment point 42 for the lower Spring end goes through. Then the rocker arm pops up the fixed contact 36 around.

The Ansehlag 50 (Figure 11a) is arranged so that the rocker arm first reached the fixed contact 34, and only then the approach 44 touches the stop 50 (Fig.lld).

According to FIG. 12, the fixed contact 36 has and the stop 50 two edges made from a conductive metal plate, for example from a copper plate. This plate

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-Τι st bent at 6θ and is bent again at 64 so that the terminal 14 can be connected to a plate part 66. It can be seen from FIG. 12 that a deviation from the bending angle at 60 has a slight influence on the angular position of the edge 36 in relation to the movement of the rocker arm in the direction D in FIG. 11a. The fixed contact 34 is also cut out of a conductive sheet metal, while the stop 48 is formed by a projection of a fastening plate part 62a.

Since the stops 48 and 50 with the fixed contacts 34 and each firmly connected, a shunt is for the rocker arm 26 formed when under the influence of the actuating button 46 or the return spring 70 (Figure 1) a sufficient override takes place. Accordingly, the current only needs to pass through the rocker arm bearing at A while the rocker arm is snapping over Hesse.

The difference between the lever arms M, and M ^ causes a strengthening of the activity movement, so that one with the easily achievable manufacturing accuracy the stops in one can bring such a position that it only after the snap motion has been released can be achieved.

According to FIGS. 4 and 5, the contact surface 26 is on the rocker arm self attached. .

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In the embodiment described, it is only necessary to start with a sheet made of hard silver (namely with the * alloy OPx J> 6 from Texas Instruments or with alloy 15065 from Englehart Industries HAWilson Division.) Or a sheet made of a rigid one Metal, for example made of stainless steel, on which the strips of a noble metal are attached * In Figure J , such a metal strip is shown. According to FIG. 8, the desired rocker arm with semi-cylindrical contact surfaces S at both ends is produced from such a sheet metal strip by pressing and further deformed by making a bead at B. The sheet metal strip is then folded around the axis A (FIG. 10) so that at 50 the support is formed on the carrier and at 28 the round contact surfaces are formed "(FIG. 4).

The rocker arm 26 'in FIG. 5 represents an example of another embodiment in which the entire rocker arm is produced from a hard noble metal alloy by stamping. The upper part 28 'is made solid, that is, not hollow, as in FIG. 4, and , together with the arms of the rocker arm, consists of a single piece of metal.

The construction of the rocker arm could also be used a metal strip between the two legs 26a in Fig.-4 runs, otherwise consists of one piece with the rocker arm,

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and is shaped like a corrugated sheet »so that it is the rocker arm spring forms.

In Figure 1, the return spring 70, which is shown dotted there, can be removed so that the switch becomes a push-pull switch, as it does not yet exist for switches of such small size. Then the spring holds the rocker arm each in the position in which it is brought by the operating button.

By combining the stiff rocker arm with the sliding movement with the contacts, you can get a subminiature holder that is surprisingly free of critical settings. Accordingly, wear in the axis A will not cause any detrimental effect, since the spring 38 can be made strong enough to press the rocker arm at its lower edge 30 firmly enough onto the plate 22a (FIG. 4) and to compensate for any wear without impairing the functionality. ....-.-

Also needs the contact 28 at the top of the rocker arm 26 is not attached to this rocker arm with great accuracy to become.

Ensure the holes in the plate 22a of the support 22 an exact location of the rocker arm on this carrier 22 and the Side plates 62,62a and 62b of the U-shaped part 18 and the fixed contacts 34 and 36 allow the carrier 22 and the

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-ίο- ■ ⁼ -.

Rocker arm in the correct position to the fixed contacts 34 and 36 bring.

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Claims (14)

Claims 1. toggle switch with swiveling rigid toggle lever, a spring »wipe the rocker arm and one beyond the Swivel axis read attachment point for one spring end, the spring two on either side one through the pivot axis and the plane passing through the fastening point stable rocker arm bubbles defined and in at least one of these rocker arm a firm contact is present, the is in turn touched by a contact attached to the rocker arm, characterized in that that the pivotable rigid rocker arm (26 in Figure 4; 26 'in FIG. 5) on a carrier which is itself movable (22) is stored; rests against the carrier (22) in a direction perpendicular to the pivoting direction, however, under the pressure of the spring (> 8); that the carrier is movable in this perpendicular direction is and that the contact (2δ) of the rocker arm opposite the fixed contacts (J4, 36) during the movement of the carrier (22) carries out a sliding movement and the fixed "contacts an in exert force lying in the direction of tilt and thus the tilting movement of the switch. 009887/0427 2. Toggle switch according to claim 1, characterized characterized that the toggle switch with its contacts has approximately the dimensions IJ χ 0.9 x 5 µm (0.5x 0.39 χ 0.2 inch). J>. Toggle switch according to Claim 1 or 2, characterized in that there is a stop (50) to limit the movement of the entire toggle lever arrangement, that this stop (50) is electrically connected to the one fixed contact (J> 6) and that the part (44) the entire rocker arm arrangement is conductively connected to the contact (28) of the rocker arm, 4. Toggle switch according to claim I, 2 or 3, since - du.rch marked that the carrier (22) 2 - is arranged pivotably within the small housing according to claim / that a lever arm (44) 'is arranged on the pivotable carrier (22), that an actuating button (46) exerts an actuating force _{on the carrier with a first lever arm (M 1) that} the contact surface (28) of the rocker arm is at a greater distance from the pivot point (42) of the carrier (22) than the length of the first lever arm (M *), so that the movement of the actuating button (46) is increased by the movement of the carrier. 009887/0427 5. Toggle switch according to claim ~ $ and 4, characterized in that the lever (44) is electrically conductive and is conductively connected to the rocker arm (26), and is also conductively connected to a terminal (12) of the switch, that a stop is present is, which in turn is actuated by the lever arm with a torque (Mp) of a greater amount than the first torque (M,) and that the stop is conductively connected to the fixed contact which is touched by the rocker arm. 6. Switch according to claim j5 or 5 * thereby characterized in that the fixed contact (36) and the stop (50) can be formed by a metal plate (62). 7. Switch according to claim 6, characterized in that the fixed contact (36) and the stop (50) are formed by a terminal lug (66) produced by means of punching, which via a bending point (60, 64) with a Mounting plate (62) are connected. 8. Toggle switch according to claim 6 or ¹ J, characterized in that the fixed contact (36) is formed by an edge of the fastening plate (62) produced by means of punching. 009387/0427 9 · Switch according to one of the preceding claims, characterized in that the rocker arm (26) and the rocker arm contact (28) located on it are made in one piece and that the surface of the rocker arm contact consists of a noble metal (Fig. 4, 5 and 7 to 10). ■ ■■ ■ ' 10. Toggle switch according to claim 9 / characterized characterized in that the rocker arm (26) completely made of hard silver. 11 * toggle switch according to one of the preceding claims, characterized in that the rocker arm (26) consists of two folded legs that a considerable part of the folding edge (30) is a bearing surface for the pivoting movement of the rocker arm (Fig. 7 up to 1-0). 12. Toggle switch according to claim 11, characterized in that the bearing surface 00) consists of a noble metal. 13 · Toggle switch according to one of the preceding claims, in particular in combination with claim ji, characterized in that the stop (48) 009887/0427 and the fixed contact - (36) both made of a plate are that this plate has a flat part (62) which forms a flat mounting surface that the carrier (22) is rotatably mounted on a second plate, which in turn defines a flat mounting surface, and that a Housing for the switch is available, which is with the flat Mounting surfaces cooperate to the rocker arm and the fixed contact (36) in the desired mutual position bring. 14. Toggle switch according to claim 1>, characterized in that the head (28) of the rocker arm (26) is located between two spaced-apart fixed contacts 0k, 36), that one of these contacts is the fixed contact (36) and the second Contact. (34) consists of one piece with a third plate (62a), that the third plate has a flat mounting surface and that the housing, which cooperates with the aforementioned flat mounting surfaces (62a), serves for the mutual adjustment of the rocker arm and the fixed contacts » 009887/0427 Blank page