DE7727244U1 - Push button - Google Patents

Description

• · · · ι t

Company Rafi GmbH & Co Electrotechn. Special factory

7981 mountain

Push button

The invention relates to a push button for actuation a contact bridge connected to an electrical circuit, which can be adjusted by means of a pressure piece inserted in a housing such that it can be displaced against spring force.

Such contact elements are already known in a large number of different configurations. Are there to a erratic contact making or contact separation, regardless of the movement of the pushbutton to make the contact elements often designed as a snap switch. Although these buttons have proven their worth, the stroke of the push button is there the Fqder acting on the contact bridge is arranged in the direction of adjustment of the button, relatively low. Also is that Construction costs for these known button configurations are large.

Bs is therefore the object of the invention to provide a push button to create the aforementioned type, which is extremely simple in terms of structural design and therefore economical to manufacture and its button still has a long travel. In addition, the button should be able to be used as a snap switch and also as an installation test for keyboards, and it should Perfect contact and a long service life can always be guaranteed.

7727244 12/22/77

According to the invention, this is achieved in a push button for actuating a contact bridge connected to an electrical circuit, which is adjustable by means of a pressure piece a displaceably inserted in a housing counter to spring force, in that the contact bridge from one approximately perpendicular to the adjustment seal of the pressure piece arranged in the housing leaf spring with two spring arms, which is formed as a contact member at one end are firmly connected and that the free end of the «One spring arm is locked on the housing of the push button and the free end of the other spring arm is held on the displaceably guided pressure piece.

This configuration and arrangement of the contact bridge is it possible to use a push button with a very large adjustment of the push button, which of course corresponds to the structural design is based on the respective requirements

speaking can be chosen to create. The width of the button is used to accommodate the spring arms, so that the contact bridge can be made large and thus it is ensured that the pushbutton has a large spring deflection, ao that there is always a perfect contact between the contact bridge and the contacts. In addition, through the In accordance with the invention, the individual parts, but especially the contact bridge of the pushbutton, are excluded. overused and thus damaged. A long service life and immunity to interference are therefore guaranteed with simple manufacture.

It is useful, for structural reasons, to also include the spring arm of the contact bridge connected to the pressure piece to provide a recess for receiving the pressure piece or a guide member formed thereon or laterally bent out and the free end of the with the housing of the pressure

7727244 2Z.12.77

button connectable other spring arm than ttt.wa perpendicular to to form this angled plate, by means of which the spring arm can be locked on the housing, e.g. stamped, iat and their to design from this protruding part as a contact flag.

The spring arm of the contact bridge that can be connected to the housing can furthermore be formed from two webs running parallel to one another or laterally outwardly curved webs which enclose the other spring arm between them. The contact member connecting the spring arms at one end is in this case as a plate running approximately perpendicular to the latter, it being advantageous to connect the contact member to a contact rivet or the like arranged approximately in the center of its axis. to be designed so that the spring arms are arranged directly next to one another.

To support the spring arm on the pressure piece, it is appropriate to this with a, preferably in one of these

to provide shaped approach incorporated open recess into which the free end of the spring arm engages. The end of that The spring arm should be folded or peeled off.

To increase the spring tension, it is also advantageous to restrict one or both spring arms of the contact bridge, preferably the outer webs of the spring arm that can be locked to the housing, in whole or in part over their length, or to bend them by 90 °.

A particularly economical production can be achieved by that the contact bridge is made in one piece by punching out of a sheet metal strip.

Further details of the trained according to the invention Pushbuttons are the example shown in the drawing, which is explained in detail below

7727244 12/22/77

remove. Here shows:

Fig. 1 shows a push button in section, FIGS. 2 and 3 show the pushbutton according to FIG. 1 with

partially or depressed print and

4 and 5 show different configurations each designed as a leaf spring, used in the push button of Fig. 1 contact bridge in plan view.

The push button shown in FIGS. 1 to 3 and each designated by 1 consists of a cubic housing 2, a pressure piece inserted in this displaceably 3, on which a button (not shown) can be plugged,

a restoring spring 7 supported on an intermediate wall 6 of the housing 2 and the pressure piece 3 and a contact bridge 11, by means of which an electrically conductive Connection is to be established. For guiding the pressure piece 3 is formed on this a guide member 4 in the form of a pin, which is in a corresponding recess 5 of the housing 2 engages and is held displaceably in this.

The contact bridge 11 is formed according to FIGS. 4 and 5 from two spring arms 12 and 13, which at one end by a plate 16 are firmly connected to one another as a contact member. A contact rivet 25 is inserted into the plate 16, namely approximately in the center of its axis, which rivet is located on contact surfaces 33 or 34 in the housing 2 held contacts 31 and 32 applies.

The free end 14 of the spring arm 12 is bent approximately at right angles and is designed as a plate 21 which is firmly attached to the

7727244 12/22/77

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ha'uae 2 connected let. For this purpose, bores 24 are incorporated into these bores, which are formed by pins 23 formed on the housing 2 be penetrated. The end of the plate 21 protruding from the housing 2 forms a contact tab 22 which is attached to a line or to be connected to a device.

The spring arm 13, on the other hand, is supported with its free end 15 on the printing piece 3. In addition, there is a protruding one on this one Formed attachment 19, which has an open recess 20. With a bevel 18, the free end 15 of the spring army 13 held in the recess 20 so that it is carried along when the pressure piece 3 is displaced. The spring arm 13 is also provided with a recess 17 within which the guide member 4 of the pressure piece 3 can move unhindered.

In the rest position of the push button 1, the pressure piece J and the associated with this key, not shown, by the return spring 7 in the in Fir. 1 held position shown. Will however, if the pressure piece 3 is displaced in the adjustment direction A, then according to the illustration in FIG supported spring arm 13 taken and adjusted in the same direction. The spring arm 12, as this is with his The end 14 is firmly connected to the housing 2, and is thus held immovable, tensioned and, as soon as a certain preload is reached, pressed by the spring arm 13 in the opposite direction. The contact rivet 25 is thereby abruptly from the contact surface 34 of the contact embodied as a normally open contact in the exemplary embodiment shown 32 lifted and pressed against the contact surface 33 of the normally closed contact 31, as shown in FIG. In each of these In both positions, the contact bridge 11 thus causes the contact rivet 25 to be supported by the spring arms 12 and 13, in particular however, by the spring arm 13, to the contact surfaces 33 or

7727244 12/22/77

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34 feat is pressed.

The Drucktaater 1 iat ale changeover contact formed to the Contacts 31 or 32, the ends of which protrude from the housing 2 al * contact lugs 35 and 36 are formed alternately

\ to be connected to a circuit via the contact lug 22. j Of course, a different type of design can also be used.

) design, for example to open just one contact or to close, accomplished by means of the contact bridge 11

j will be.

j The spring arm 12 of the contact bridge 11 or 11 'consists, as this can be seen in FIGS. 4 and 5, appropriately; from two webs 12 'and 12 "or 12a and 12b, the doii spring arm

j 13 between them. This is a space-saving

Arrangement created, and the production of the contact bridge 11 is easily possible by punching out of a sheet metal strip. To increase the moment of resistance and thus the {preload to be applied in order to connect the contact bridge 11 *

! place, the webs 12a and 12b are bent by 90 °.

A 6543 le-mm Aug. 26/1977

7727244 12/22/77

Claims (10)

MI (IIII I I G ti I Cl Q Engel hordt Patentanwalt Firm "Rafi GmbH & Co Ϊ? 09? ^ Blektroteohn. Speaialfabrik Ehlereatraße 17" Tel. Berg η s ρ r ii c h e: 1. Push button for actuating a contact bridge connected to an electrical circuit, which by means of a is adjustable in a housing against spring force slidably inserted pressure piece, characterized, that the contact bridge (11, 11 ') consists of an approximately perpendicular to the adjustment direction (A) of the pressure piece (3) in the housing (2) arranged leaf spring with two spring arms (12, 13), which are firmly connected to one another at one end designed as a contact member (16), and that the the free end (15) of one spring arm (12) is locked on the housing (2) of the push button (1) and the free end (14) of the other spring arm (13) are held on the displaceably guided pressure piece (3). 2. Push button according to claim 1,
characterized, that the spring arm (13) connected to the pressure piece (3) the contact bridge (11) with a recess (17) for 7727244 12/22/77 f · I ι ι ι would take the pressure piece a (3) or a aiujaformten on this Guide member (4) provided or laterally bent is. 3. Drucktaater according to claim 1 or 2,
characterized, that the free end (14) of the peder arm (12) of the contact bridge which can be connected to the housing (2) of the push button (1) (11) is designed as a plate (21) angled approximately perpendicular to this, by means of which the spring arm (12) is attached to the housing (2) is lockable, e.g. stamped, and the part protruding from this is designed as a contact lug (22) is. 4. Push button according to one of claims 1 to 3, characterized gekennzeiphnet, that the with the housing (2) connectable spring arm (12) of the contact bridge (11) consists of two parallel to each other or laterally outwardly curved webs (12 ', 12 "or 12a, 12b) are formed, which the other Enclose the spring arm (13) between you. 5 »Push button according to one of Claims J to 4, characterized in that that the spring arms (12, 13) connecting at one end Contact member (16) is designed as an approximately perpendicular to these extending plate. 6. Drucktaater according to claim 5, characterized, that the contact member (16) with an approximately in its Aclis- 7727244 2Z. 12.77 ItII I < · centrally arranged contact rivet (25) or the like. has passed. 7. Push button according to one of claims 1 to 6, characterized in that that to support the one spring arm (13) on the pressure piece (3) this with one preferably in one on this molded approach (19) incorporated open recess (20) is provided into which the free end (15) of the spring arm (13) engages. 8. Push button according to claim I _1, characterized in that that in the recess (20) of the pressure piece (3) engaging end (15) of a Federarrnes (13) with a Fold (18), a bead odjcjgl. is provided. 9. Drucktaater according to one of claims 1 to 8, characterized geken nzeich, that one or both spring arms (12, 13) of the contact bridge (11), preferably the outer webs (12a, 12b) of the spring arm (12), which can be locked with the housing (2), for elevation the spring tension is completely or partially set along its length, for example bent by 90 °. 10. Push button according to one of claims 1 to 9, characterized in that that the contact bridge (11) is made in one piece by punching out of a sheet metal strip. A 6543 e-mmι
Aug 26, 1977 7727244 12/22/77