DE1291399B - Electric push button switch with double snap function - Google Patents

Description

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The invention relates to an electrical tactile elimination of the actuating force without an additional one switch with double snap function with a spring or other parts automatically disengaged Plunger-actuated snap mechanism, the three gear position back. The switch is thereby as a stiffener, Has pivotable levers in tilt positions, switches can be used.

namely one between fixed contact pieces around- 5 Except for the mentioned previously known design, snap-on contact arm, one on the contact arm which has the self-cleaning effect Gertes flip-flop and a contact pressure around a fixed point during the switching process, however bordered pivotable, drops to zero via the flip-flop, which affects the transmission of the Contact-poorly acting actuating lever, also has a detrimental effect on switching capacity, are still others two stationary stops and a tension spring, whose io snap switch has become known. However, you are possible lines of action lie in such a way that all levers are too complicated to build and therefore difficult to use of the snap mechanism always adjust in the direction of the rest and relatively expensive. In many cases it arises position by the prolonged price increase through the use of a large Level of the tilting member always on one side of the swivel number of items and two springs. she bearing of the operating lever points over. Such 15 are therefore not ideal for mass production. Switches are also known as micro- In a further embodiment of the invention, the carries

switch known. However, they have the disadvantage that the central contact connection forming support brackets that the contact arm around a fixed point apart from the pivot bearing for the actuating lever is pivoted and therefore when separating the Kon- and the anchoring of the tension spring also the local clocks the desired self-cleaning effect does not depend on fixed stops for the contact arm. thanks to this occurs. This has a significantly shortened life construction results in the simple structure of the duration result. Switch, which makes it particularly suitable for series production

The invention is based on the task of making suitable.

a switch of the above type the mentioned after- The invention is based on the drawing

parts to avoid. In particular, the contact arm 25 is to be explained in more detail in an exemplary embodiment. It shows to achieve the self-cleaning effect before the F i g. 1 the spatial representation of a switch

Pivoting can be moved. He should also according to the invention,

get by with a single spring and the con Fig. 2 is a side view on an enlarged scale

Maintain the cycle pressure until the switchover process. of the switch of Fig. 1 partially broken open-finally is also a short length and 30 mm side wall,

aimed at a small weight, and to achieve F i g. 3 the rest position of the switch and

leaf spring joints and F i g. 4 the toggle position of the switch, respectively

Leaf spring arms are avoided. schematically and in exaggerated representation.

According to the invention, this object is achieved by a box-shaped switch housing α is through

solves that the contact arm near its contact remote 35 permanently closed a cover b by means of rivet c or other suitable end depending on its position on one of the stationary means. In the switch housing there is α stops that it is pluggable with its remote contact, the contact carriers d and e, which carry the contacts / end at approximately in the extension of the contact arm and g. Also lying tilting member is articulated that the free, pluggable is located in the switch housing α the com angled end of the actuating lever is articulated with the second end of the tilting member, which can be mounted outside the switch housing α, composite snap mechanism, consisting of the multiple that the actuating lever with its longer.Sehen- angled support bracket k, the operating lever k kel above the tilting member and the rear including tilting member r, helical tension spring m and con-end of the contact arm and that the tension spring is taktarm n. The support bracket h is at its one in itself 45 end for receiving the actuating lever k engages in a known manner on the contact arm correspondingly and fixedly shaped in the plane of symmetry of the fixed contact. Outside the switch housing a piece is anchored. are the support bracket h and the contact carrier d

This switch can be designed using only a few and e as appropriate connections, parts that are easy to manufacture from a manufacturing point of view. A space-saving design can be produced in a recess in the switch housing α. The 50 of the actuating ram is slidably mounted, which has contact pressure, in contrast to a similarly known snap switch located inside the switch housing α , is provided with a groove up to the end so that it has a finite actuating lever k when the snap contact swings over there is sufficient lateral guidance. Value. In addition, in this arrangement, the tension coil spring m is at one end

adjacent contacts during the um - 55. in .the-close the switch contacts in the centrally ο switching operation slidably moved against each other, π WO recessed contact arm and hooked with its other h by the desired, very useful Selbstreini- end in the support bracket. It expresses how gung effect results. for example from FIG. 3 shows the contact

Ρ even with extremely slow movement of the loading arm against the knife-edge bearing, whereby the Kipptätigungsstößels is a good utilization of the current 60 r membered about the knife-edge bearing s of the operating load of the contacts ensured because the Hebeis k latter and thus also the actuation contact force at the Snapping always keeps a plunger in its starting position, has finite value. The advantages mentioned- The suspension point for the helical tension spring m

possible to use the switch where it is located approximately in the middle between an upper snap-action switch of conventional design due to its 65 ren and lower susceptibility to failure arranged on the support bracket h , quite be stop t or u. The deflection angle α and a of the special where a high vibration and shock resistance contact arm η are required by these stops mitkeit. The moving parts are determined.

In the following functional description, the auxiliary lines AB are assumed as the imaginary center line of the contact arm η and CD as the imaginary center line of the helical tension spring m.

When the actuating plunger is pressed, the cutting edge bearing s is moved in the direction of the line AB of the contact arm η via the actuating lever k . After the unstable equilibrium position of the moving system has been exceeded, the end of the contact arm resting on the stop u jumps to the stop t and the movable contact jumps from the upper, /, to the lower fixed contact g. The contact arm η jumps through the line CD of the helical tension spring m.

The switching state according to FIG. 4 lasts as long as the force on the actuating plunger is effective remain.

When the actuating force acting on the actuating plunger Z is removed, the return force of the spring acting on the actuating lever k automatically results in the movement of the composite spring mechanism in reverse order, i.e. no additional parts are required for the automatic return to the initial position of rest. Since the cutting edge bearing s describes a circular arc around the pivot bearing ν, a sliding movement is transmitted via the tilting element r to the contact arm η and thus to its switchover contact ο , whereby a possible weld with the respective contact / or g is broken.

The result is a small snap-action switch that requires little technical effort requires and offers high operational reliability. It is especially useful when a slow Moving the actuating plunger cannot be avoided. In addition, the sudden demolition the contacts achieved that, for example, when switching off inductive loads, a contact erosion and Standing fire and thus the premature destruction of the switch as well as electrical switching faults to a large extent be avoided.

Claims (2)

Patent claims: 1.Electric pushbutton switch with double snap function, with a snap mechanism that can be actuated by a plunger and that has three rigid levers that can be pivoted in tilting bearings, namely a contact arm that can be snapped around between fixed contact pieces, a tilting member mounted on the contact arm and a tilting member that can be pivoted to a limited extent around a fixed point via the tilting member Contact arm acting actuating lever, also two stationary stops and a tension spring, whose possible lines of action are so that all levers of the snap mechanism are always pushed towards the rest position, in that the extended plane of the tilting member always points on one side past the pivot bearing of the actuating lever, characterized in, that the contact arm (s) near its end remote from the contact, depending on its position , rests against one of the stationary stops (μ, t) , that its end remote from the contact (p) is articulated on the tilting member (r) lying approximately in the extension of the contact arm, that the free, angled end of the Operating lever (k) is articulated to the second end (s) of the tilting member, that the operating lever with its longer leg is above the tilting member and the rear end of the contact arm and that the tension spring (m) engages the contact arm in a manner known per se and is fixedly anchored in the plane of symmetry of the fixed contact pieces. 2. Switch according to claim 1, characterized in that the support bracket Qi forming the center contact connection, in addition to the pivot bearing (v) for the actuating lever (k) and the anchoring of the tension spring, also includes the fixed stops (u, i) for the contact arm («) wearing. 1 sheet of drawings