DD155219A1 - COMPATIBLE AND RELEASE MECHANISM FOR PROTECTION SWITCHES, IN PARTICULAR CIRCUIT PROTECTION SWITCHES - Google Patents

Abstract

The invention relates to a Betetigungs- and Ausloesemechanismus for circuit breakers, in particular miniature circuit breakers in narrow construction. It is the object of the invention to provide a switching mechanism with high turn-off speed and selectivity using simple, space-saving components at low latching forces. The invention is based on the object, a switching mechanism with a movable shift finger, the free end is formed as a contact piece and the other end is supported via a latched arm in the housing and is actuated via a clip on the switch knob, which with the latch lever a stationary axis is stored together, geblinkt, so to improve that a contact opening is virtually without overcoming the Leerwegs. The object is achieved according to the invention by a tension spring which is einhaengt on the one hand between the point of attack of the bracket and the contact point, on the other hand in the free end of a mounted on the fixed axis clamping lever is housed, when turned on near its bearing against the in a slot of the shift knob hinged Buegel, lifting from a fixed stop, runs.

Description

-1- 226017

Actuation and release mechanism for circuit breakers, in particular circuit breakers

At the application area of the invention

The invention relates to an actuation and release mechanism for circuit breakers, especially circuit breakers in narrow construction, Such switches are used in electrical installations for overload and short circuit protection.

Chara kteristik the known technical solutions

Circuit breakers usually have a switching mechanism with magnetic and thermal tripping and manual and free release. The movable contactor of a contact assembly is opened by release of mechanical energy, which has been stored by previous operation of the manual reset mechanism. For installation reasons, the aim is to keep the height of circuit breakers as low as possible. Therefore, the switching mechanism may consist of only a few and as simple as possible components. On the other hand, ever higher cut-off power and selectivity requirements are required by the plant, which requires a very fast and accurate release mechanism with high contact pressure and ηί * "" clinging latching forces,

226017

For this purpose, it is already known to support a one-armed movable shift finger whose free end is formed as a contact piece, via a latched arm in the housing and the ratchet lever with the switch knob on a common axis to store, the operation of the switching finger on a switch knob hinged bracket takes place (DE-OS 1 908 723),

This arrangement is so far unsatisfactory, as after the unlatching of the shift finger first a vorzusehender for the lifting and Abbrandreserve idle must be traversed before the contact opening occurs, but it is important that after exceeding the threshold, the contact still opens during the current increase , so the current-limiting effect of the switch. In the presence of a free travel _s, as is typical for circuit breakers, this condition can only be met with considerable requirements * «

Although it is also known to arrange a., Shift finger, a locking lever and a toggle of a circuit breaker on a common stationary axis and to store the pawl on the shift finger, whereby a free travel after unlocking is omitted (DE-OS 1,588,505), however This advantage comes with other disadvantages. Thus, a relatively elongated end-mounted shift finger from home a high moment of inertia «This is considerably increased by the bearing of the pawl on him * Furthermore, changes by zulössiaen burning at the contact point, the Laoe of the Verklinkungssteile relative to the tripping ¬ organs, which change the response values of the switch «·

Object of the invention

It is the object of the invention to provide a switching mechanism with a high turn-off speed and selectivity using

- 3 - 22 6 oil 7

Creating simple, space-saving components with low latching forces,

Explanation of the nature of the invention

The invention is based on the object, a switching mechanism with a movable shift finger whose free end is formed as a contact piece and the other end is supported via a latched arm in the housing and aer is actuated via a bracket on the handle, which with the latch lever on a stationary axis is mounted together, is articulated, so to improve that a contact opening is virtually without Oberwindung of Leerweg proceeds.

The object is achieved by a tension spring which is hooked on the one hand between the point of attack of the bracket and the contact point, on the other hand hooked in the free end of a mounted on the fixed axis clamping lever, when turned in the vicinity of its bearing against the in a slot of the shift knob hinged bracket, lifting from a fixed stop, running,

embodiment

The invention will be explained in more detail with reference to the accompanying drawings »It shows

Fig. 1 switching mechanism in closed position Fig. 2 switching mechanism in the off position, the switching mechanism is geometrically oriented by two fixed axes (9, 16). A knob (8), a clamping lever (4) and a latch lever (3) are mounted on the one axle (9) .A pivot lever (2) is mounted on the second axle (16) and is connected to the latch lever (3). the pawl (17) forms, a shift finger (1) is on the

2 2 6 0 17

Pivoting lever (2) mounted, it is about a tension spring (b) with the clamping lever (4) and a U-bracket (7) which is mounted between the point of application of the tension spring (5) and a bearing point (18) with the Toggle (8) in connection, When switching is by turning the knob (8) of the bracket (7) entrained in the slot and thereby the shift finger (1) moves in the switch-on. The clamping lever (4) abuts against the stop (14). The tension spring (5) is tensioned. In the last third of the rotational movement of the knob (8) of the U-bracket (7) against the curve piece (13) of the clamping lever (4) is printed, so that at the moment Kontakt'gabe (11) and the further movement of the knob (8) The contact force is by the tension spring (5) via the clamping lever (4) and U-bracket (7) on the shift finger (1), by appropriate translation on the clamping lever (4), The lifting of the clamping lever (4) causes the required contact force to be present in the region of the distance (a) (through-travel) (FIG. 1),

Upon actuation of the latch (17) via a non-illustrated shutter button is released, the pivot lever (2) and the shift finger (1) rotates about the bearing point (10) wherein the switching path is opened instantly. At the same time, the clamping lever (2) rotates to the stop (14) and the knob (8) in the starting position, wherein the latch lever (3) and the pivot lever (2) is latched, at a manual switch off the toggle (8) to the left rotated, while the U ~ bracket (7) is carried along and the clamping lever (4) turned to the stop. Thereafter, the shift finger (1) by rotation about the bearing point (18) is opened (Fig, 2),

Claims (1)

invention claim Activation and release mechanism for circuit breakers, in particular circuit breaker in Schrnalbauweise, with a movable shift finger whose free end is formed as a contact piece and the other end is supported via a verk.linkten pivot arm in the housing and which is actuated via a bracket on the switch knob, which is mounted together with the pawl lever on a stationary axis, is articulated, wherein between the point of attack of the bracket and the contact point in tensioned tensioned tension spring is mounted, characterized in that the other end of the tension spring (5) in the free end (12 ) mounted on the stationary axle (9) clamping lever (4) is mounted in the closed position in the vicinity of its bearing against the in a Lsngloch (6) of the switch knob (8) hinged bracket (7), of a stationary stop (14 ) takes off, runs. For this / J page drawing