DE2416969A1 - PUSH BUTTON SWITCH - Google Patents

Description

PATENT LAWYERS

Dr.-Ing. Wolff
H. Bartels

Dipl.-Chem. Dr. Brandes 2416969 Dr.-Ing. hero

Dipl.-Phys. Wolff

7 Stuttgart 1, Lange Strasse 51 Tel. (0711) 29 6310 and 29 72 95

Registration number. 123 427 Telex07223i2 (patwod)

Telegram address: Hx 07 22312 wolf f Stuttgart

Postal check account Stuttgart 7211 BLZ 600 100 70
Deutsche Bank AG ₁ 14/286 30 bank code 600 700 70

Office hours: 8 a.m. to 12 p.m., 1 p.m. to 4.30 p.m. except Saturdays

3/18/1974 / 3322xbk

Company Kautt & Bux KG., Stuttgart-Vaihingen
(Baden-Wuerttemberg)

Push button switch

509843/0082 Telephone information and

Orders are only after written

Confirmed! ": '!« Tr ·' ^:

The invention relates to a push button switch, in particular for household appliances, with at least one switching bridge, which by means of of the spring-loaded push button alternately from a first position in which they conduct two fixed contact pieces with one another connects, to a second position in which it is at a distance from the fixed contact pieces, and from the second in the first position in the switch housing is movable.

The well-known switches of this type, which are mainly used for household appliances, for example vacuum cleaners, are used, have a rotatably mounted switching bridge, which with each actuation of the push button is rotated through an angle of 90 °. These switches work satisfactorily within the power range, for which they are approved. However, an increase in the permissible amperage encounters difficulties, provided that the The external dimensions of the switch must not be increased, as the contact pressure of the switching bridge, which is caused by its resilient formed ends is produced, only with considerable effort, for example? with the help of bimetal strips, in the required Dimensions can be increased. In addition, the required actuation force is increased by the increased contact pressure, see above that the actuating mechanism must also be grounded to a greater extent. A Another disadvantage is that at least in the available space a two-pole training dos switch can not be realized, since this two rotors in axial Direction arranged one above the other must v / earth.

The invention is based on the object of providing a push-button switch to create, with which a

Fotorennennst rr m increased load capacity, for example a / load capacity of 8 Am-

Alternating current _{or similar}

pere at 250 V / and a maximum temperature of 125 C. without increased effort. With a push button switch of the type mentioned at the outset, this object is according to the invention solved in that the switching bridge as a translationally displaceable, spring-loaded contact piece is formed and that a longitudinally connected with the push button

509843/0082

he
slidable / and mier to this direction of movement deflectable plunger as well as .ein the position of the switching bridge determining, spring-loaded intermediate member are provided, which is displaceable in the switch housing in the direction of displacement of the plunger and at the end of its guide corresponding to the first position of the switching bridge in a lock with the Switch housing effecting locking position is tiltable and has two contact surfaces for the plunger, which are aligned in the locking position and the unlocking position on the plunger and have a position which when loaded by the plunger to one

a moment in the sense of tilting into the locking position or tilting out of the lock resulting deflection of the plunger.

By designing the switching bridge as a contact piece, the contact bridge and the contact pressure can be adjusted in a simple manner Dimension so that a much higher current rating without increased dimensions of the switch housing can be achieved. Furthermore, through the tiltable intermediate member and the plunger that actuates it, it is simpler and more space-saving Way the; Transfer the movement of the pushbutton to the switching bridge and keep it in the first switching position for so long locked until the push button is pressed again. Another advantage is that a second jumper can be used without difficulty can be provided if a two-pole design of the switch is required.

In one advantageous because of its structural simplicity Embodiment ir, t the intermediate member is tiltably mounted in a groove of a holder q guided in the switch housing, in which the switching bridge and at least one prestressed, on which the fixed contact pieces on the opposite side to the shell {bridge adjacent spring is arranged. Both the storage of the pontic as well as the transmission of the movement of the; Intermediate link

S C - 8 A 'J / UU 82

the holder is solved in a particularly simple manner, and by the spring loading the switching bridge, the displacement path of the holder can easily be equal to that of the intermediate member selected and the contact pressure set to the desired value.

The guiding of the intermediate member and its locking can also be achieved in a simple manner if the intermediate member at its two ends each has a guide body, each of which is assigned a guide groove in the switch housing and which are each provided with a stop surface, which in the locked position on assigned stop surfaces of the switch housing issue. The guide bodies serve not only for guidance, but also for locking. Appropriately With such a design of the intermediate member, the two contact surfaces for the plunger are in the central section of the intermediate member intended.

In a preferred embodiment, the holder has an im Switch housing guided on the middle part, of which a single switch bridge support arm in the case of a single-pole design of the switch a two-pole design of the switch, two diametrically located switch bridge support arms protrude at right angles. The switch can can then be designed with one or two poles without any design changes.

So that the plunger in the by the tilting movement of the intermediate link and the resulting relocation of the contact surfaces Dimensions can be deflected, it is in an advantageous embodiment with its remote from the intermediate member The end of a strip-shaped nose of the push button can be tilted. In addition, at least two arms protruding at right angles from the plunger are provided at this end, on which the intermediate member . facing side that rests one end of the return spring of the push button, which is arranged concentrically to the plunger. The plunger will

509843/0082

~ ^r ~ 2A16969 5

normally in its central position due to the return spring held, from which he, however, contrary to the force of the spring because of the storage on the bar-shaped nose to one or the other Side according to the displacement of the contact surfaces of the intermediate link can swing out during this tilting process. So that the plunger is not only supported smoothly on the push button, but is also secured against displacement out of the bearing point, it is advantageous to place the nose in the contact with the plunger Area to give a semicircular cross-sectional profile and the plunger with a semicircular recess for engagement to provide the nose.

In a preferred embodiment, however, the plunger is in one piece formed with the push button made of a thermoplastic material. The ram has a rebound its free end in a radial plane under the forces occurring when moving the intermediate member permitting Shape. The shape of a tongue with a rectangular cross-section is advantageous because it has sufficient rigidity in the Direction transverse to the direction of deflection is present.

It is also advantageous to have the fixed contact pieces each with a contact zone that is elevated towards the switching bridge To provide contact surface for the switching bridge, as this improves the contact on the one hand and an accumulation on the other foreign bodies in the area of the contact surface can be prevented.

A preferred embodiment also has pins which connect the individual parts of the housing to one another and which are formed in one piece with one of the housing parts made of thermoplastic material and are provided with a central channel for the engagement of self-tapping screws. The switch can then be connected to the device not only by inserting it into predetermined recesses, but also by flanging it using self-tapping screws. A particularly good hold of the self-tapping screws

509843/0082

(ο

one aims when the central channel of the tenon has a square profile Has.

To simplify assembly, it is also advantageous to provide the pins with at least one outer annular bead each, which forms a snap lock with a shoulder of the channel receiving the pin in the other housing part. The housing parts then just need to be plugged together. The usual connection with the known switches by means of hollow rivets not applicable.

In the following the invention is based on various in the drawing illustrated embodiments explained in detail. Show it:

Fig. 1 is a schematically illustrated longitudinal section of the

first embodiment with the switch open;

FIG. 2 shows a longitudinal section corresponding to FIG. 1 with the switch closed; FIG.

Fig. 3 is a perspective, bent apart and

partially broken view of the first embodiment;

Fig. 4 is a perspective and shown broken away

View of the push button and upper housing part of a second embodiment;

5 shows a longitudinal section through the push button of a third embodiment;

6 shows a longitudinal section through the push button, rotated by 90 ° in relation to the section according to FIG. 5 of the third embodiment.

509843/0082

A push-button switch, which is provided in particular as a foot-operated switch for household appliances, such as vacuum cleaners, has, as Fig. 1 shows, one translational in one as a whole with 1 designated switch housing led push button 2, which by two lateral flats against rotation and secured by radial projections against being pushed out of the switch housing under the action of a push-button return spring 3 is. The push-button return spring 3 lies with 4-hrem one End with the interposition of a ring 4 on the arms / a T-shaped plunger 5, which like the switch housing and the push button may consist of thermoplastic material, but in the exemplary embodiment is a stamped part made of steel. The plunger 5 is provided in the area between the two arms with an approximately semicircular recess 6 into which a engages semi-circular profile having nose 7 of the push button. The preloaded, designed as a helical spring Push-button return spring 3, which retracts the shaft of the plunger 5 concentrically surrounds, seeks to hold the shaft in the longitudinal axis of the push button, but allows the Tappet 5 to the left or right in the case of a blinking light according to Fig. 1 to. The end of the push-button return spring 3 facing away from the arms of the plunger 5 rests in one piece with the switch housing 1 formed support parts 8.

The free end of the shaft of the plunger 5 is on the middle

directed a rod-shaped base body having, a / in the exemplary embodiment made of plastic intermediate member 10, which extends at right angles to the shaft of the plunger 5 and a guide body 11 at both ends. The two guide bodies 11 each engage in a guide groove / äes switch housing, whereby the intermediate member ΙΟ / the direction of displacement of the push button 2 and the plunger 5 is guided displaceably and secured against tilting. However, the guide grooves 12 end before the push button has reached the position in which it is deepest into the switch housing 1 when the push button 2 is actuated and the intermediate member 10 is displaced

5098 A3 / 0082

is inserted. As soon as the guide body 11 have left the guide grooves 12, the intermediate member 10 can be one

its main body IQ ¹ ,, _ _,, _.

Longitudinal axis / tilt. The stop surface 11 'of each guide body facing the push button 2 comes into contact with an assigned one Stop surface 13 of the switch housing 1.

The tilting movement of the intermediate member 10 when the guide bodies 11 exit from the guide grooves 12 into the position shown in FIG. 2 Locking position shown and the tilting movement occurring in the opposite sense when unlocking the intermediate link IO is effected in that in the middle section of the intermediate link 10, two contact surfaces 14 and 15 each forming an inclined plane are provided for the contact of the free end of the plunger 5 which form the abutting flanks of two V-shaped grooves. When the guide body 11 in the guide grooves are guided, the contact surface 14 faces the free end of the plunger 5. In the locked position (Fig. 2), the plunger

5 against the contact surface 15, which is aligned with the longitudinal center plane of the intermediate member encloses a smaller angle than the contact surface 14.

The semi-cylindrical on the side facing away from the plunger 5 The base body 10 'lies in a trapezoidal groove 16 of a holder 17 made of thermoplastic material, which is displaceable in the direction of movement of the push button 2 in a guide of the switch housing 1 and against a Tilting is secured. A centrally arranged helical spring 18 lies on the one hand on the one facing away from the intermediate member 10 Side of the same and on the other hand on the bottom 19 of the switch housing 1. The stops of the switch housing limit the Displacement of the holder 17 away from the floor 19.

From the middle part of the holder 17 having the groove 16, a one-piece leads at right angles to the direction of displacement of the holder with the holder 17 formed arm 17 'away, in a section having the shape of a square tube ends. In the channel 21 formed by this section is a switching bridge 22, which has the shape of a rail and with

5098 ^ 3/0082

both ends forming the contact surfaces from the channel 21

protrudes in channel 21. A pretensioned coil spring 2 3_ / presses the Switching bridge 22 against the bottom 19 of the switch housing 1.

If the switch has two poles, it is diametrically opposed, as shown with dashed lines in FIG. 1 a second arm 17 "is arranged in relation to the arm 17 ', which is designed like the arm 17 and carries a second switching bridge 22'.

The two ends of the jumper 22 and possibly 22 ″ is one each fixed contact piece 24 assigned. When the switch is closed, the switching bridge is on these contact pieces 24 with a Contact pressure which is equal to the force of the coil spring 23.

If the push button 2 is actuated with the switch open, the free end of the plunger 5 presses against the contact surface 14

first of the intermediate member 10, whereby this / only translationally is moved towards the bottom 19 of the switch housing 1, since the guide body 11 prevent a tilting movement. The intermediate link 10 moves the holder 17 against the force of the helical spring 18 against the bottom 19, so that the switching bridge 22 and the possibly existing jumper 22 'in the annex the associated contact pieces 24 comes.

As FIG. 2 shows, each switching bridge is lifted from its contact surface on the arm, so that the tension of the helical spring 23 is increased. As soon as the guide body 11 reaches the end of the guide grooves 12 facing the base 19 have, the intermediate member 10 is tilted into the position shown in FIG. 2, because the counterforce of the helical spring 18 the free end of the plunger 5 slides into the bottom of the V-shaped groove, one flank of which is formed by the contact surface 14 will. Since the bottom of this groove comes from the median plane of the intermediate

509843/0062

JO

member is offset, a torque is exerted on this in the sense of a tilting movement, which leads to the stop surface 11 * each guide body 11 comes into contact with the associated stop surface 13 of the switch housing 1. The coil spring 18 holds the two stop surfaces in contact with one another, and the inclination of these stop surfaces is selected so that the Intermediate link IO remains in the locking position, even if the push button 2 is now released again and in the starting position returns.

To open the switch again, press button 2 again actuated.'Da in the locking position of the intermediate link 10 facing the free end of the plunger 5, the stop surface 15 is, the free end of the plunger now slides into that groove of the intermediate member 10, whose.eine flank through the contact surface 15 is formed. The bottom of this groove is also outside the center plane of the intermediate link. When actuated of the push button 2, the intermediate member 10 is pushed so far against the bottom 19 of the switch housing 1 until it is through the simultaneously effective torque can tilt back into a position in which the two guide bodies 11 can enter the guide grooves 12. Stop surfaces in extension of the Guide grooves 12 limit this tilting movement so that it is ensured that the guide bodies 11 move into the guide grooves 12 enter as soon as the push button is released. The return of the intermediate member 10 and the holder 17 in the in The position shown in FIG. 1 takes place through the force of the helical spring 18.

As FIG. 3 shows, the fixed contact pieces 24, which are formed in the lower part 25 of the two-part in the exemplary embodiment Switch housing 1 are inserted and lie in a plane parallel to the floor 19, each with an elevated contact zone

at
24'f / which ^ the two contact zones of the switching bridge 22, which is designed as a contact contact piece, rest when the switch is closed.

509843 / 0Ü82

Furthermore, Fig. 3 shows that the lower part 25 has a facing to the upper part 26, cylindrical extension 27 with two through its longitudinal axis extending and at right angles to each other is provided slots 28 and 29, in which the holder 17 and the intermediate member 10 are guided. The upper end of the extension 27 is used as a spring plate for the push-button return spring 3 trained. . .

Diametrically ^{to the} extension 27, two identically designed pegs 30 extending in the same direction are provided, which are designed in one piece with the lower part 25 and have an outer annular bead 31 at their free end. A central channel 32 of each pin 30 has a square profile.

On each of the two pins 30 in the upper part 26 of the switch housing 1 there is a bore 33 adapted to the pin diameter aligned which an annular bead 34 protrudes. The diameter of the annular bead 34 and its distance from the lower end of the bore 32 are chosen so that together with the annular bead 31 of the pin 30 a snap lock is created. So need during assembly only the pin 30 to be inserted into the two bores 33, whereby the two housing halves are centered. When the two housing halves rest against one another, the two annular beads 31 engage behind the annular beads 34 and thereby hold the two halves of the housing together. The two halves of the housing can then no longer be separated without tools.

If the switch is to be flange-mounted, a self-tapping screw is screwed into each of the two channels 32.

If the plunger 5 is designed as a stamped part, it is useful to him against tilting in a direction perpendicular to the plane in which he is when the intermediate member is actuated 10 is deflected, and to be secured against rotation. In the exemplary embodiment, the push button 2 is therefore in his Inside provided with strips 35 in their central part

509843/0082

each have an extension in the direction of the free end of the plunger 5. The height of the ribs 35 is 5 'in the area of the arms of the plunger 5 counted so that the ring 4 rests against the ribs and between the arms 5 'and the ring 4 there is nothing worth mentioning Game is present. As a result, the plunger 5 is also held in the longitudinal axis of the push button when the push button return spring does not have an end face at right angles to its longitudinal axis, as is the case when the end face the spring is not sanded.

When using a plunger 105 made of a thermoplastic material, it is, as FIG. 4 shows, advantageously, four arms 105 ' to be provided. However, three evenly offset ana- ■ are sufficient arranged arms. For anti-twist protection and alignment of the spring end in a plane on which the longitudinal axis of the push button is perpendicular, the push button 102 is with ribs 135 engaging between the arms, the height of which is the same as the height of the ribs 35 is selected, provided. A national tour, however, is not required. »

In another embodiment of which only the push button is shown and described, since it does not otherwise differ from the embodiment according to FIGS. 1 to 3, the plunger 205 is formed in one piece with the push button 202 made of thermoplastic material. The plunger has here, as FIGS. 5 and 6 show, the shape of a tongue which has a rectangular cross-sectional profile. Both the dimensions of the cross-sectional profile and the tapering of the plunger 205 to its free end are chosen so that the Plunger 205 under the opening when the push button is pressed

in

occurring forces / the required when tilting the pontic Dimensions can be deflected, but is stiff in the direction perpendicular to it. in the exemplary embodiment is therefore the width of the plunger shown in FIG. 6 is a multiple of the thickness shown in FIG.

Inwardly projecting formed integrally with the push button 202 Ribs 236, each with a shoulder 236 ', serve to support one end of the push-button return spring.

509843/0 0 82

Claims (1)

Claims 1. j push button switch with at least one switching bridge, which by means of the spring-loaded push button alternately from a first position in which it conductively connects two fixed contact pieces to a second position in which it is located at a distance from the fixed contact pieces, and from the The second can be moved into the first position in the switch housing, characterized in that the switching bridge (22, 22 ') is designed as a spring-loaded contact piece guided in a translationally displaceable manner and that a longitudinally locked with the push button (2; 102; 202) he
slidably and transversely to this direction of movement deflectable plungers (5; 105; 205) and a spring-loaded intermediate member (10) which determines the position of the switching bridge and which can be displaced in the switch housing (1) in the direction of displacement of the plunger and in the first position the end of its guide corresponding to the switching bridge can be tilted into a locking position causing a lock with the switch housing and has two contact surfaces (14,15) for the plunger, which are aligned in the locking position and in the unlocking position on the plunger and have a position which when exposed to the. The plunger leads to a deflection of the plunger resulting in a moment in the sense of tilting into the locking position or tilting out of the locking position. Switch according to Claim 1, characterized in that the contact surfaces are formed by the abutting flanks ( 14, 15) of two side-by-side grooves of the intermediate member which are open towards the plunger (5; 1O5; 2O5). Switch according to claim 1 or 2, characterized in that _; the intermediate member (10) is tiltably mounted in a groove (16) of a holder (17) guided in the switch housing (1), in which the switching bridge (22,22 ') and at least one prestressed one on which the fixed contact pieces (24) face away Side of the spring (23) resting against the switching bridge is arranged. , 509843/0082 4. Switch according to one of claims 1 to 3, characterized in that the intermediate member (10) at its two ends each has a guide body (11), each of which is assigned a guide groove (12) in the switch housing (1) and each with a stop ^{surface (II 1} ) are provided, which in the locked position rest against associated stop surfaces (13) of the switch housing, and that the two contact surfaces (14,15) for the plunger (5; 105; 205) are provided on the middle section of the intermediate member. . Switch according to one of Claims 1 to 4, characterized in that that the holder (17) has a central part guided in the switch housing (1), of which the single-pole design of the switch a single switch bridge support arm (17 '), two diametrically in the case of a two-pole design of the switch horizontal switch bridge support arms, protrude at right angles. 6. Switch according to one of claims 1 to 5, characterized in that that the plunger (5) with its end facing away from the intermediate member (10) on a strip-shaped nose (7) of the push button (2) rests tiltably and at this end at least two arms protruding at right angles from the shaft of the plunger (5 ¹ ), on whose side facing the intermediate member one end of the push-button return spring (3) arranged concentrically to the plunger (5) rests. 7. Switch according to claim 6, characterized in that the The nose (7) has a semicircular cross-sectional profile in the area resting on the plunger and the plunger has a semicircular recess (6) is provided for the engagement of the nose. 5098A3 / 0082 8. Switch according to one of claims 1 to 7, characterized in that the plunger (5, -105) in the region of the tiltably mounted end arms (5 ¹ ) on which a helical spring (3) concentrically surrounding the plunger is supported, and that the arms lie between ribs (35; 135) whose head surface forming a support surface for the helical spring lies at least approximately in that surface which is defined by the support surfaces of the arms at a position of the plunger in the longitudinal axis of the push button. 9. Switch according to one of claims 1 to 5, characterized in that that the plunger (205) is formed in one piece with the push button (202) made of thermoplastic material and one is a rebound of its free end in a radial plane below that when the intermediate member is displaced occurring force permitting form. 10. Switch according to claim 9, characterized in that the plunger (205) has the shape of a rectangular cross-section Has tongue. 11. Switch according to one of claims 1 to 10, characterized in that that the fixed contact pieces (24) each have a contact zone (24 ') which is elevated towards the switching bridge (22,22') have as a contact surface for the contact bridge. 12. Switch according to one of claims 1 to 11, characterized by the individual parts (25,26) of the housing (1) connecting pins (30) which are integrally formed with one of the housing part (25) made of thermoplastic material and with a central channel (31) are provided for the engagement of self-tapping screws. ' 509 8A3 / 0082 13. Switch according to claim 12, characterized in that the central channel (32) has a square profile. 14. Switch according to claim 12 or 13, characterized in that the pins (30) each have at least one outer annular bead (31) on the iron with a shoulder (34) of the pin receiving channel (33) in the other housing part (26) forms a snap lock. h Π 9 8 A 3 I 0 ü 8 2