DE417917C - Automatic electrical switch in the form of a safety plug - Google Patents

Description

The invention relates to an automatic electrical switch in the form of a fuse plug. According to the invention, the hollow shaft of a spring is in the axis of the plug Rotary switch mounted, which penetrates a shaft, one end of which is in the Axial direction of the fuse resiliently movable magnetic core carries, and its other ίο the end is coupled to the rotary handle, which has a locking mechanism that defines the switching position; the shaft also carries a driver for rotating and triggering the switch.

In the drawing, an embodiment is shown, namely show:

Fig. Ι a fuse plug in section,

Fig. 2, 3 and 5 details, namely sections along lines 2-2, 3-3 and 5-5 of the Fig.i.

Fig. 4 shows the armature with its. Coupling parts.

As can be seen from Fig. 1, in the cover made of insulating material there is a brass socket n, which is pierced in the shaft and provided with an internal thread for receiving a grub screw χ. The grub screw itself is again drilled centrically. This hole serves • to accommodate a freely movable pin x ¹ , which at its end protruding from the grub screw carries a small spiral spring ρ to return an armature k . When the grub screw is tightened, the pin x ¹ does not follow the rotary movement.

The brass bushing η on the one hand carries the handle Ό and is formed at its lower end protruding from the cover plate with a square (Fig. 2) and also into a hollow plate with two recesses m (Fig. 1 and 3).

The brass bushing is stored in the cover and is opened by the handle 0

held against axial displacement. The armature k is suspended from the spiral spring ρ by means of the armature shaft k ^1. The anchor shank k ¹ engages with two shank arms (coupling web) k in two recesses m of the hollow plate of the socket n. With this arrangement, only an axial displacement of the anchor shank itself and of the anchor is possible. The retention of the brass socket «in the

ίο switched on or off position is done by two flat springs r, which are embedded in the insulating cover and lie against the square of the brass socket η (Fig. 2). The anchor shaft k ¹ leads through a hollow drilled shaft s of the actual switch and carries fork-shaped arms / (anchor handles) and the actual anchor k at its lower end. The arms I are used to take along a driver cross (switch cross) that is firmly seated on the hollow switch shaft s. Two arms s ^{2 of} this cross (Fig. 5) are slightly longer than. the other two s ¹ held for the purpose of limiting the switch-on and switch-off travel and engage in recesses s ^{3 of} the insulating body e ¹ . Switching on and off or freewheeling now proceeds as follows:

i. Activation.

If the handle ο is turned by 90 ⁰ , the square of the brass bushing η bends the two springs r apart until the next square surfaces lie against the springs r. This holds the switch in the on position. This rotation of 90 ⁰ of the armature shaft must k ^l as a result of its two recesses in the m of the hollow plate of brass bushing ti engaging switch arms k-join. Furthermore, the arms t of the anchor shaft, which are in engagement with the arms s ^{1 of} the carrier cross s ¹ , transmit this rotation to the switch shaft s, which is under radial spring action t (Fig. 1). The rotation of 90 ^° is caused by the stop of the extended arms s ² of the switch cross (Fig. 5) limited ^{to the recesses s 3 of} the insulating body e ^1. The safety switch is thus switched on and, as already noted above, is held in this position by the two flat springs r resting against the square of the brass bushing η.

2. Deactivation.

If the armature k is attracted as a result of the rated current being exceeded, the arms t of the armature shaft k ^{1 are} released and the shaft s swings back by 90 ° under the action of the spring t. The safety switch is thus switched off. At the same time, the armature k is pulled upwards again by the spring ρ , as a result of which the arms t of the armature shaft k ^{1 come} into engagement again with the driver cross of the switching axis s . The armature k with the shaft k ¹ can therefore not participate in the disengaging movement of the axis s, since it is prevented from doing so by the two shaft arms k ² , which are not pulled out of the recesses m of the hollow plate of the brass bushing η , and, as already mentioned above noticed that the brass bushing η is held in place by the two flat springs r . The switch-off path is limited by the stop of one of the two extended arms s ^{2 of} the driver cross on the right recess s ^{3 of} the insulating body e ¹ (Fig. 5).

3. Idle.

Is overcurrent, e.g. B. as a result of a short circuit, still present in the line, and if the fuse switch, as described under 1, tries to turn on, then when the fuse is switched on, the triggering described under 2 takes place again immediately, even if the switch handle or the like is held.

When the fuse is switched on, the current flows from the foot contact α via the magnetic coil b, the line c, the fixed contact d, the contact disk e with slotted contacts on the axis s, the fixed contact / and the line g to the threaded contact h.

Claims (2)

Patent-to sayings: I. Automatic electrical switch in the form of a fuse plug, thereby marked "that in the axis of the plug the hollow shaft one under the Action of a spring standing rotary switch is mounted; the hollow shaft penetrates a shaft, one end of which is one in the axial direction of the fuse carries resiliently movable magnetic core and the other end is coupled to the rotary handle, which is the switch position has locking mechanism; the shaft also carries a driver for rotating and triggering the switch. 2. Switch according to claim 1, characterized in that the control spring for the armature is arranged in the hollow shaft of the rotary handle. 1 sheet of drawings.