DE428423C - Polarized alarm clock system - Google Patents

Description

Polarized alarm clock system. The alternating current alarm clocks used so far in practice have a fixed permanent magnet and an electromagnet system, the Anchor is arranged so that, taking into account easier adjustability depending depending on the design and area of use, in addition to a certain sensitivity a corresponding striking of the clapper takes place.

The systems always remain in a limited relationship of dependency in terms of the magnetic dispersion of the location of the anchor to the Lines of force fields of the permanent magnet and the electromagnet, whereby also the magnetic Air resistances are of particular disruptive importance.

The purpose of the invention is to overcome the disadvantages of the known alarm clock systems to avoid that using the known arrangement of two U-shaped electromagnets facing each other, the force line fields of both types of magnet be brought into such a position to each other that the previously so disruptive influence the magnetic air resistance is almost completely excluded, and that If the sensitivity is sufficient, the volume should be as high as possible when it is hit achieved.

According to the invention this is achieved in that between the U-shaped Electromagnet, for example, a U-shaped permanent magnet mounted in this way is that its two poles move in the same direction with one or the other the electromagnet come into contact. This also includes demagnetization the permanent magnet designed as an anchor counteracted by the vibration, by placing the permanent magnet at the moment of contact with the attracting poles the same sense of its own field is magnetized. So it arises in this Moment in the permanent magnet a larger force field than in the de-energized state of the two electromagnets is the case. Due to the peculiar design of the anchor it is also achieved that when the armature is tightened (with the same stroke), a double lever arm effect comes about compared to the simple systems that have become known up to now with stationary permanent magnet.

The drawing shows the exemplary embodiments according to FIGS. 1 and 2 the structure of the system is shown schematically.

Trained as a permanent magnet U-shaped armature a, which around the Axis x is rotatably mounted, oscillates between the pole pieces of the horseshoe curved electromagnets ml and m2, which are provided with magnet windings w1 and w2 and are excited by an inductor current through the terminals c and d. The Weckerklöppei k is attached to one of the legs of the U-shaped anchor a.

From the figure it can be seen that with each passage of current through the electromagnet windings w1 and w2 have double attraction and double repulsion the leg of the U-shaped anchor a takes place. This makes it so powerful Impact effect of the clapper k achieved as polarized by the well-known Alarm clock systems cannot be reached. A demagnetization of the armature a Serving permanent magnets practically does not take place, because it becomes the magnet magnetized again with each stop against the pole shoes in the sense of permanent magnetism.

The armature can also be assembled from two U-shaped magnets e, f (Fig. 2) to form an H-shape, which then oscillates between eight poles of four horseshoe-shaped electromagnets.

Claims (1)

PATENT CLAIM Polarized alarm clock system with two or more stationary, mutually facing U-shaped electromagnets and an armature movable between them, which is U-shaped and in the middle position in a plane perpendicular to the plane of the electromagnets and is rotatable about an axis parallel to its yoke, characterized in that, that the armature is permanently magnetic in a manner known per se and its poles are arranged to one another in such a way that they are magnetized in the same sense of their own field at the moment they strike the attracting poles.