DE2328752A1 - Snap-action switch with end fixed lever arm - has spring device with adjustable prestress, affecting arm free end for contact motion - Google Patents

Abstract

Against the free end of the level arm and the spring device is located a rigid lever, forming with the lever arm a toggle with blade bearing supported toggle point. The spring device acts substantially in the longitudinal direction of the rigid lever. A blade bearing may be arranged between the rigid lever free end and the spring device. The latter may be adjustable from outside of the switch housing. The spring device may contain a plate abutting on one side of the housing, extending across the rigid lever and prestressed in its long direction.

Description

PATENTANWÄLTE "*, _N D" NBERG "." Tan 5.6.1973

DR MAX SCHNEIDER pick-up box, Könfgstraße 1 (museum blocks)

DR.ALFRED EITEL ERNST CZOWALLA 2328752

DIPL. ING. - DIPL. LDW.

NUREMBERG

Telephone collective no. 20 39 31

Bank accounts at Deutsche Bank A.G. Nuremberg No. 33O.i88 Hypobank Nuremberg No. 156/274 500

Postschedc account: Nuremberg Office No. 383

Wire address : Norispatent

this no. 25th

Eberle Werke KG., 85 Nuremberg 30, Oedenberger Strasse 55 -

"Snap switch"

The invention relates to a snap switch with a lever arm locked on one side and one on the between two end positions pivotable free end of the lever arm acting spring device with adjustable preload, around the lever arm and thus a movable contact connected to it, resiliently in an end position to press.

Such snap switches are widely used in microswitches. On the other hand, they also come preferentially in the case of regulators of the most varied of types, for example temperature regulators. You can, especially in the the latter case, thermally, but also mechanically

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be practiced. The lever arm, which can be rigid or designed as a spring, in particular as a leaf spring, swivels, from one fixed end position to its other end position. Usually two contacts are closed in one end position, separated in the other end position. However, other solutions are also conceivable.

The controller is operated according to Swiss patent specification 251 432 a bi-metal spring as a lever arm clamped on one side, a U-shaped expansion spring acts on its free end, the opening width of which is defined by an aui 'the one Leg acting regulating screw arranged in the housing is adjustable. Such a spreading spring is comparatively soft and the adjustment range is narrowly limited. A special The disadvantage is that the contact pressure cannot be adjusted precisely enough, even to relatively low values.

The invention is based on the object of creating a snap switch in which a high level of setting sensitivity is achieved with few resources and achieved a large adjustment range and carried out the adjustment in the simplest possible way can be.

To solve this problem, he switches to a jump initially mentioned type provided according to the invention that the free end of the lever arm and the spring means a

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a rigid lever is interposed, which with the lever arm forms a knee lever that is supported at the articulation point, wherein the spring device in the v / es entlichen in the longitudinal direction of the rigid lever works.

This arrangement of a special rigid lever between the free end of the lever arm and the spring device, instead of the previously known direct action of the spring device on the lever arm, has the advantage that, despite the free end of the lever arm which must necessarily be arranged inside the switch housing, the spring device now does so can be arranged and designed so that it can be adjusted in a simple manner from the outside.

In a further development of the invention it can be provided that the fire device has one on the outside of the holder housing arranged, extending essentially transversely to the rigid lever and resiliently biased in the longitudinal direction thereof Contains plate which is supported on one side of the housing and which is roughly centered by a pressure screw that can be screwed into the housing is enforced. This plate can either be designed as a leaf spring or the rigid one Plate and the head of the pressure screw, a helical compression spring can be arranged between ^ e.

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The moving contact could of course be directly on the Lever arm or the rigid lever may be provided, but in a broader embodiment of the invention it is advantageous if an angle lever is attached to the rigid lever and the movable contact to a transverse between a fixed contact and a spaced stop protruding, cantilevered and at the free end in the free end of the Angle lever freely mounted pivot arm is arranged, which in turn can also be designed as a leaf spring. This design also has the advantage that, on the one hand, the contacts are further away from moving parts can be arranged and that on the other hand, a translation of the through appropriate training of the angle lever ochaltweges of the movable contact can be effected in relation to the switching path of the free end of the lever arm.

Further advantages, features and details of the invention emerge from the following description of two exemplary embodiments as well as on the basis of the figures in the drawing. Show:

Figure 1 is a cut-away side view of an inventive Jump holder in the stable separation point of contacts and

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Pigur 2 is a side view of a snap switch with different -shaped spring device in the actuating position with adjacent contacts.

The two snap switches shown in the drawing can be used, for example, to form a microswitch, or, especially if the lever arm 1 is a bimetal spring, to form a temperature-dependent switch Find use. The lever arm 1 is mounted with its end 2 on the housing part 3. Between a cutting edge bearing 4 am free end of the lever arm 1 and a cutting edge bearing 5 of a fire device 6 is a rigid lever 7 on which a with the movable contact 8 connected toggle lever 9 is fixed, clamped under the action of the spring device 6 standing with the lever arm 1 forms a toggle lever. The one fastened to the angle lever 9 with the aid of e.g. rivets 10, preferably designed as a metal plate, rigid lever 7 is provided with cutting edges 12 which are in the cutting edge bearings 4 and 5 intervene.

The snap switch can be activated by actuating pin 13 in Direction of the arrow P mechanicch driven so that aas free end 4 of the lever arm 1 overcoming the biasing force the spring device 6 is pivoted into the actuation position shown in phantom in Figure 1, in which the movable contact 8 away from the stop 14 in

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System position, is pivoted to the stationary contact 15. If the lever arm 1 is a bimetallic spring, the actuation generally takes place when the this bimetallic leaf spring inherent spring tension is increased by a change in temperature so that this force the Biasing force of the spring device 6 overcomes. Of course the stop 14 can itself represent a contact, so that switching between the contacts 14 and 15 can take place and it could - omitting the angle lever 9 - the contact 8 directly on the lever arm 1 or the rigid lever 7 be arranged.

In the illustrated arrangements, the movable contact is 8 arranged on a leaf spring 17 clamped on one side on the housing 16, which between the stop 14 and the fixed Contact 15 protrudes and the free end 18 of which is connected to the free end 19 of the angle lever 9. In the illustrated Training of the angle lever 9 results in a translation of the switching path of the movable contact 8 opposite the switching path of the frei®. End of lever arm 1.

In the exemplary embodiment shown in FIG. 1, the spring arrangement 6 consists of a ^{plate 20 that is designed as a leaf spring 1} and which has one end 21 on the outside of the

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Housing 16 is supported, while the other end 22 is the cutting edge bearing 5 carries. By more or less strong screwing in of the “pressing clirube 23”, the gate tension of this Set the spring arrangement 6 and thus the pressure to be applied by the lever arm 1 to switch over the jump holder.

In the arrangement of Figure 2, the plate 20 is rigid and the necessary door tension in the longitudinal direction of the rigid lever 7 is provided by one of the plate 20 and the head

24 of the pressure screw 23 interposed helical compression spring

The less the pressure screw 25 is tightened, ie the less it is screwed into the housing, the less! ¹ is the pressure to be overcome to operate the jump switch.

When using a Sprurg switch according to the invention for Of course, the temperature controller does not necessarily have to be designed as a bimetallic leaf spring, the lever arm 1, but it would also be possible to use a temperature-sensitive, for example designed as a bimetal spring, switching element to attack pin 15 in order to move it in the direction of the Arrow P to move it ;.

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Claims (10)

Patent claims: 1 / Snap switch with a lever arm locked on one side and one that can be swiveled between two end positions free end of the lever arm acting spring device, with adjustable door tension, resiliently around the lever arm and thus the movable contact connected to it to press into an end position, characterized in that that the free end of the lever arm (1) and the spring device (6) a rigid lever (7) is interposed, which with the lever arm (1) a knife-edge bearing at the hinge point Forms toggle lever, the spring device (6) essentially in the longitudinal direction of the rigid lever (7) works. 2. Snap switch according to claim 1, characterized by a cutting edge bearing (5, 12) between the free end of the rigid lever (7) and the spring device (6). 3. Snap switch according to claim 1 or 2, characterized in that the spring device (6) from the outside of the switch housing (16) is adjustable. 409882/0452 4. Snap switch according to claim 1, characterized in that the spring device (6) has a substantially transversely to the rigid lever (7) extending and resiliently biased in the longitudinal direction, on one side of the housing (16) supporting plate (20) which is approximately in the middle by a pressure screw that can be screwed into the housing (16) (23) is enforced. 5. jump holder according to claim 4, characterized in that that the plate (20) is designed as a leaf spring. 6. jump holder according to claim 4, characterized in that that the tar tension of the rigid plate (20) takes place by a helical compression spring (25). 7. jump holder according to one of claims 1 to 6, characterized characterized in that an angle lever (9) is attached to the rigid lever (7) and that the movable contact (8) is attached a transversely between a fixed contact (15) and a spaced-apart stop (14) protruding, clamped on one side and arranged at its free end (18) in the free end (19) of the angle lever (9) freely mounted pivot arm (17) is. 409882/0452 -1Q- 8. jump holder according to claim 1 to 7, characterized marked- ■ net, that the swivel arm (17) is designed as a leaf spring. ο snap switch according to one of claims 1 to 8, characterized by training the Winkelhebelß (9) in such a way that it translates the switching path of the movable Causes contact (8) opposite the switching path of the free end of the lever arm (1). 10. Snap switch according to one of claims 1 to 9, characterized characterized in that the angle lever (9) consists entirely or partially of insulating material. 409882/0452