DE2348297A1 - SMALL TRANSFORMER WITH A PROTECTIVE ARRANGEMENT AGAINST OVERLOAD - Google Patents

Description

PBF 1792 24 September 1973

Schutzapparate-Gesellschaft Paris' &: Co, mbHoila ^; Schalksmühle

Small transformer with a protection arrangement against overload '■ -' .- '■■ -;:, - ^{; :} "■"

The invention relates to a small transformer for electrical devices, for example for razor sockets, with a protection arrangement against overload, which is caused, for example, by excessive current consumption

Most of the known protective devices for small transformers use switches with switching bimetallic strips for protection »They have the disadvantage that in the event of an overload the overcurrent protection device switches continuously · This can be a Damage to the transformer as well as the overcurrent protection device itself as a consequence «To avoid that, it is for shaver sockets with an isolating transformer and a switch made up of fixed contacts and mating contacts is formed, which are movable together with a slide made of insulating material of the connector pins, known between Provide a latching or coupling that can be triggered by overcurrent for the slide and the mating contact carrier, in front of them Triggering of the mating contact carrier connected to the slide for entrainment and, after it has been triggered, the mating contact carrier is movable with respect to the slide. As a coupling between the. Slide and the counter contact carrier is used by the consumer current Heatable bimetallic strip, one end of which is attached to the contact carrier or the slide and the other end of which is attached in the case of liennstrom on the slide or the mating contact carrier or stands out in the case of overcurrent

Such a protective arrangement is connected to a socket nit one of tied to the connector pins movable slide and very complex

509814/0156

PBF 1792 ^ λ _ ■ ■ ··. 2 ο ο.

The present invention has for its object to provide a. Small transformer. to create with a protection arrangement against overloads, which is independent of the special peeling devices mentioned. The protection arrangement should also be effective when the current is taken from the small transformer via a normal socket or the transformer is also directly connected to a removal line is connected · In addition, should also; the one in the one and Switch-off position locked switches as such in general and not only be usable for protective arrangements

The object is achieved according to the invention in that the protective arrangement consists of a switch interposed in the transformer input and locked in the switch-on position and consists of a bimetallic strip that is connected to the. Laminated core of the transformer connected in a thermally conductive manner and the switch locks when it is bent outwards.

The switch of the protection arrangement is according to a further invention sgedanke designed as a small slide switch and with a inside the switch housing against the force of a compression spring movable actuating slide which brings about the contact closure of the contact bridge and which can be locked in the switched-on position equipped, its compression spring is in the direction of the operating axis of the operating slide between this and a fixed point arranged, for locking the operating slide is a recess on the operating slide itself and on the switch housing a lever that snaps into the recess with a free arm is arranged

In further training of the small slide switch is its lever designed with two arms to release the lock and pivotable about a pivot point against a spring force, its first era is used to lock, its second arm is outside the switch housing as an actuating lever to release the lock of the switch passed through the bimetal strip.

509814/0156

BATH ORIGINAL

PBF 1792

A particularly favorable solution results from the fact that the arm of the Helel of the small slide switch used as an actuating lever is arranged between the fixed point for the compression spring and the compression spring.

The explanations show that the lever is not only actuated mechanically by a bimetallic strip, but also in some other way can, so that you can, for example, this. Could also use small slide switches as limit switches

The essence of the invention is illustrated below with reference to four figures explained in more detail using an exemplary embodiment

FIG. 1 shows the side view of one in a through outlines indicated housing built-in small transformer to be protected with the small; slide switch in the cover of the housing »

FIG. 2 shows a plan view of the arrangement according to FIG. 1,

FIG. 3 shows a plan view of the slide switch in its switched-off position and

FIG. 4 shows the top view of the slide switch in its closed position

The housing for the transformer consists, for example, of the base plate 1 and a cover 2, which are connected to one another. It can be snapped onto rails, for example. A small transformer of the usual type with the primary winding is located in the hood 2 3 and a secondary winding 4 and the laminated core 5 installed. The heat-conducting baffle 6 is attached to the laminated core 5 and a bimetallic strip 7 is arranged thereon, which is shown in FIG the area of the trigger element of the miniature switch to be triggered extends

The small switch, which is arranged in the ceiling of the cover 2 of the housing for the transformer, also consists of a device

5098U / 0156

PBF 1792 _ if _ .... 4. ····

housing β, which is composed of two mirror-image parts is. The lower part of the housing is, for example, molded into the hood · In the housing β there are two contact pieces 9 and 10 for The connection of the connecting lines is attached and the operating slide 11 with the on / off button 12 is guided in a guide. The actuating slide 11 has a connecting contact 13 at its end, with which it contacts the contact pieces 9 when it is switched on and IO can bridge or close. The switch-off position of the operating slide 11 is by a compressible Spring 14 ensures that between a fixed point 15 and one shoulder 16 lies on the operating slide 11 · To lock the operating slide 11 in the switched-on position When the spring 14 is tensioned, there is a recess 17 on the actuating slide 11 itself and one with a nose 10 in the recess 17 of the actuating slide 11 snapping-in lever 19 which is provided in the housing 6 of the miniature switch. in the illustrated case, the lever 19 is designed with two arms and is pivotable about the pivot point 20, its lever arm 19 is used, As already stated, the locking of the actuating slide 11, its arm 19 a is out of the housing Ö of the switch out and serves to release the locking of the actuating slide 11 by means of the bending out bimetallic strip 7 ·

The switch can of course be switched on and off by pressing the switch button 12 and can also be used for other purposes . If you equip this switch with two-armed levers 19, 19 a, then you can use it as a limit switch or for other tasks. If such applications are not used, it is sufficient to equip the switch with the lever 19 and the further links 17, 10 of the locking mechanism.

509814/0156

Claims (1)

PBF 1792 -S "- September 24, 1973 Schutzapparate-Gesellschaft Paris & Co. mbH KG., Schalksmühle Claims Small transformer with a protection arrangement against overload, characterized in that the protection arrangement consists of one interposed in the transformer input, in the switched-on position locked switch and consists of a bimetallic strip (7), which is connected to the laminated core via a guide plate (6) (5) of the transformer (3 * 4 »5) is thermally connected and the lock (17, 1Ö, 19) of the switch when bending triggers 2 · Small transformer according to claim 1, characterized in that. that the switch designed as a small slide switch and with one within the switch housing (β) against the force of a compression spring (14) movable, the contact closure, the Contact pieces (9, 10) causing, and in the engagement position lockable actuating slide (11) is equipped, its compression spring (14) in the direction of the axis of movement of the actuating slide (U) is arranged between this and a fixed point (15) and that for locking the actuating slide (11) on the actuating slide (11) itself a recess (17) and on the switch housing (Ö) with a arranged free arm in the recess snapping lever (19) is· 3. Kleintransfonaator according to claim 1 and 2, characterized in that that the lever (19) of the small slide switch to release ' the lock is designed with two arms and is pivotable about a pivot point (20) against a spring force, its first Arm (19) is used to lock and its second arm (19 a) to the outside of the switch housing (ä) as an actuating lever to release the lock (17, Id, 19) of the switch is guided through the bimetallic strip (7). 509814/0156 BATH ORIGINAL PBF 1792 -fc -.,. 2 ... 4. Small transformer according to claim 1 to 3, characterized in that that the operating lever (19 a) used. Arm of the lever (9) of the small slide bar between the Fixed point (15) for the compression spring (14) .und the compression spring (14) is arranged. 5098U / 0156