EP0849749A1 - Detent mechanism for push button switch - Google Patents

Abstract

The ratchet mechanism has a ratchet cam (18) attached to the push-button slider (12) cooperating with the bent guidance end of a wire hoop (24), which is moved along the cam surface upon operation of the push-button slider, for sidewards and subsequent location in a ratchet notch for holding the push-button slider in a defined position. The push-button slider has a shaped spring element for biasing the wire hoop on a direction transverse to the push-button axis.

Description

The invention relates to a locking mechanism in the Preamble of claim 1 specified genus. Such Locking mechanisms have become known in a wide variety of designs. In all versions, the slides in the Backdrop guide rotating guide pin, which in general is formed by the angled end of a wire bracket along a locking profile and becomes in the course of its movement deflected to both sides of the key axis. When moving between the off position and the on position the guide pin must be at a deflection point of the Locking profile of the locking heart are passed. To a to ensure a safe crossing of this deflection point, the deflection point is usually designed as a tip, so that the bracket after a short deflection phase by spring force into the Switch-on position is pressed. However, it has been shown that through manipulation or limited impressions of the Key slide the guide pin on the deflection tip of the Locking profile remains. The switch is in this position switched on, but the key slide switches at the second Don't print, the wire bracket slides with his angled end in the ON position. Only after one the pushbutton is pressed again to switch it off. This can lead to incorrect actuation and to the fact that a device unintentionally remains in the switch-on position.

To avoid this dangerous operating condition three-dimensional rest hearts became known, in which still a flow curve is provided in the base of the resting heart. However, this has the disadvantage that the angled end of the Wire bracket, which is not always made free of burrs can, runs on the bottom of the resting heart and scrapes in there. Here it is also necessary that the wire bracket by an additional spring, generally a leaf spring, pressed to the bottom of the resting heart, or the Wire hanger is given a complicated shape such that then the back pressure spring the wire bracket to the bottom of the locking heart presses. These known constructions have only one limited life because of the wire bracket, which is not always can be produced without burrs, buried in the raster heart. If you want to avoid this wear from the ridge, you have to the wire bracket can be made burr-free, which is the manufacture not insignificantly more expensive.

The invention has for its object a simple, two-dimensional locking mechanism to create the avoids the described incorrect operations with certainty and the switching sequence OFF-ON-OFF with certainty when repeated Guaranteed key press.

The task is solved by the in the labeling part of claim 1 specified features.

The positioning force exerted on the side of the bracket prevents that the guide pin remains on the deflection tip, even when the pivoting movement of the guide bracket deliberately by special Action is slowed down, causing a random movement prevented by its own weight in an unfavorable installation position shall be. In general, it will be enough Guide pin or wire bracket during the switching movement between the off position and the on position to suspend the lateral preload in such a way that the Wire bracket only from one side to the middle position is transferred or its transfer is supported.

With special designs of the locking mechanism, however, it can also be useful, the switching bracket from both sides pre-tension in the middle position or a pre-tension in a one-sided position.

A particularly simple and functional construction of a Push button switch with locking mechanism results from the Features of claim 3. Accordingly, for support of the wire bracket and plastic hook to prevent it from falling out are provided, which are molded onto the key slide are and overlap the wire bracket, one of the hooks retracts under self-elasticity when deflecting and a Force on the wire bracket.

Further refinements of the invention result from the Subclaims.

Fig. 1 eine Teilansicht eines Drucktastenschalters mit dem erfindungsgemäßen Rastmechanismus, wobei der Drucktastenschalter in der 'Ein'-Stellung befindlich ist;

Fig. 2 eine Ansicht in Richtung der Tastenschieberachse;

Fig. 3 eine der Fig. 1 entsprechende Ansicht in einer Stellung kurz vor Erreichen der Einschalt-Stellung;

Fig. 4 eine der Fig. 2 entsprechende Ansicht in der Schaltstellung gemäß Fig. 3;

Fig. 5 eine Seitenansicht des Rastmechnismus im Schnitt;

Fig. 6 ein weiteres Ausführungsbeispiel eines Drucktastenschalters mit Rastmechanismus.

An embodiment of the invention is described below with reference to the drawing. The drawing shows:

Figure 1 is a partial view of a push button switch with the locking mechanism according to the invention, wherein the push button switch is in the 'on' position.

Figure 2 is a view in the direction of the key slide axis.

3 shows a view corresponding to FIG. 1 in a position shortly before reaching the switch-on position;

FIG. 4 shows a view corresponding to FIG. 2 in the switching position according to FIG. 3;

Fig. 5 is a side view of the locking mechanism in section;

Fig. 6 shows another embodiment of a push button switch with a locking mechanism.

In the drawing are only those for the locking mechanism according to the invention important parts of the push button switch shown, the push button switch itself can be arbitrary and in be known manner.

The push button switch has a slidable in a housing 10 stored key slide 12 on a plate 14 wearing. This plate forms the locking heart for the locking mechanism. This has a heart-shaped recess 16 in the plate 14 and one in the middle of the recess up to plate height protruding locking profile 18. The recess 16 forms its edge and in cooperation with the locking profile 18 one Link guide 20 for the angled guide end 22 of a Wire bracket 24, the other angled end 26 one opposite the leading end 22 has increased leg length and protrudes into a bore 28 of a bearing block 13 fixed to the housing and against which the key return spring 32 is supported.

When pressing the key slide 12 when pressed on the one hand and by the return movement of the return spring on the other is caused that the angled guide end 22nd of wire bracket 24 in the guide 20 of the dashed Line follows in the direction of the arrow. The angled forms End 26 a pivot pin for the bracket, which in Is pivoted to both sides in the course of its movement. The spring 32 loaded on the pivot pin 26 brakes the Swivel movement from, so that the wire bracket in the given The rest position remains, regardless of the installation position of the switch so that it is not by its own weight can fall into another position. In the fully awarded in Fig. 1 In the on position, the leading end 22 is in the switch-on position in a locking recess 34 of the locking profile 18, and in the on position (dashed lines in Fig. 1 shown) the leading end is in the position 22 '. Both in the on position and in the Switch-off position, the wire bracket 24 is in the direction of Key slide axis.

On the plastic slide switch 12 are at right angles above two hooks 36 and 37 above molded a stem 38 and 39. Stems 38 and 39 can dodge elastically across the key slide axis. As can be seen from Fig. 2, the overlapping one another Hooks 36 and 37 over the wire bracket 24 and prevent one This bracket falls out.

To prevent the wire bracket 24 in the position according to Fig. 3 remains in the guide end 22 on the deflection tip 40 of the locking profile 18 comes to rest, the Handle 38 of the hook 36 an inwardly projecting extension 42 on. As can be seen from Fig. 4, the wire bracket lifts 24 during its lateral deflection between the off position and the on position the hook 36 over the 4 to the right, so that the stem 38th is resiliently biased inward towards the key axis, and this spring bias causes the leading end 22nd of the wire bracket 24 securely lifted over the deflection tip 40 is and under the action of the return spring 32 in the locking recess 34 (switch-on position) occurs. During the switching movement between the on position and the off position the leading end 22 to the other side after the Handle 39 is deflected, but this handle is not deformed, because here the extension 42 is missing and the wire bracket 24 can dodge under the hook 37.

Fig. 6 shows a further embodiment of a push button switch with locking mechanism, in which the wire bracket 24a supported laterally by a plastic part 43 is. This plastic part is such on the key slide 12 attached that the wire bracket 24a in its deflection in Locking profile 18 is biased laterally by self-suspension. As soon as the bent end of the wire bracket 24a, which in the Locking profile runs, arrives at the top of the locking heart, the locking bracket jumps over the tip and snaps securely in the on position. Even with this push button switch a lateral force acts on the locking bracket, which through the pre-tensioning of the elastic wire bracket is produced. 1 to 5 the push button switch differs according to FIG. 6 by a much longer training of the wire bracket 24a, which in in this case by a bridging the key slide 12 Web 44 is secured against falling out. The plastic part 43 is integrally formed on the key slide and preferably has a spherical design. The return spring also presses here 32 on one end of the locking bracket. As from Fig. 6 can be seen, the key slide 12 has a central recess 46 between two side strips 48 in which the wire bracket 24a lies and by bridging the strips 48 Web 44 is secured against falling out. 6 right-hand bar, the spherical plastic part 43 is formed, which extends approximately so far inwards that the wire bracket is just touched in a stretched position and during movement its cranked end biased laterally in the raster heart becomes.

Reference list

10th

casing

12th

Key slider

14

plate

16

heart-shaped recess

18th

Locking profile

20th

Scenery tour

22

Leaders

24th

Wire bracket

26

The End

28

drilling

30th

Bearing block

32

Return spring

34

Rest recess

36, 37

hook

38, 39

stalk

40

Deflection tip

42

Continuation

43

Plastic part

44

web

46

Central recess

48

Afford

Claims (7)

Locking mechanism for a push button switch, which has a push button (12) with a locking heart (16, 18) for the angled guide end (22) of a wire bracket (24), which runs through the heart curve when the push button (12) is actuated and is laterally deflected and in a locking recess (34) of the locking heart is pressed by the key slide return spring (32), whereby the key slide is held in a defined switching position,
characterized in that means (38, 42) are provided which act on the wire bracket transverse to the axis of the key slide (12). Locking mechanism according to claim 1,
characterized in that the key slide (12) has a molded-on spring element (38) which biases the wire bracket (24) transversely to the button axis to the central position of the wire bracket, in which it lies parallel to the button axis. Locking mechanism with the following features: a key slide (12) is displaceable in a housing (18) against spring force (32); the key slide (12) has a locking heart (28); a wire bracket (24) with an angled anchoring end (26) is inserted into a bore (28) of a bearing block (30) fixed to the housing as a pivot pin and engages with the other angled guide end (22) in the latching heart; the pivoting movement of the pivot pin (26) is braked by the return spring (32) supported thereon; two elastic stems (38, 39) are formed on the side of the key slide (12); the stems (38, 39) carry hooks (36, 37) which overlap the bow leg (24) from both sides and secure against falling out; at least one of the hooks (36) acts upon this bracket in the sense of centering when the bracket (24) is laterally deflected transversely to the key axis. Locking mechanism according to claim 3,
characterized in that the at least one hook (36) has an extension (42) projecting laterally from the handle (38) and acting laterally on the wire bracket (24). Locking mechanism according to claims 3 and 4,
characterized in that the extension (42) lies in the plane of the hook (36). Locking mechanism according to claim 1,
characterized in that the wire bracket (24a) is resilient and cooperates with a rigid attachment part (43) of the key slide (12). Locking mechanism according to claim 6,
characterized in that the key slide (12) has a central recess (46) in which the wire bracket (24a) can be moved laterally to a limited extent and in that a plastic part (43) is formed on the side in the central recess (46) and extends inwards and acts on the wire bracket (24a).

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