DE415959C - Hammer breaker for induction coils - Google Patents

Description

The invention relates to a hammer breaker for induction coils; z. B. for induction coils, which are intended for the generation of currents which are used for medical Examination and treatment have the required frequency and peculiarity.

There are already hammer breakers whose arrangement consists of a single one contact attached to a moving part. These result from an oscillation its moving part a closure and an interruption of the circuit of the Primary coil. They are perfectly usable as long as the number of interruptions changes in the unit of time within given limits; but their application becomes difficult and annoying when you reach higher interruption numbers in the unit of time want, which are above the upper limit of the performance of the hammer.

This disadvantage is avoided according to the invention, in that the hammer breaker consists of an arrangement of contacts which have such a number of interruptions in the primary circuit cause which is a multiple of the number of vibrations of the moving part of the hammer.

You can therefore achieve higher numbers of interruptions, as z. B. for medical Purposes are necessary without exceeding the normal boundaries between which the number of oscillations of the moving part of the hammer can change.

The accompanying drawing shows, for example, two embodiments of the hammer breaker :

Fig. Ι is a schematic view of a first embodiment and the induction coil, to which the same is applied.

Figures 2 and 3 are an elevation and a plan view of this embodiment.

Fig. 4 is a plan view of the second embodiment.

According to Fig. 1, a current source a (steady, pulsating, alternating, etc.) feeds the primary coil b of the induction coil bh by means of a supply line c on the one hand and a line d, a contact arrangement e of the first embodiment, a line / and a variable resistor g on the other hand. The secondary side of the induction coil is shown in h .

This embodiment consists of a unilaterally wound electromagnet i (also seen in Fig. 2, 3), w hich ^r horizontally

on which one of the arms of the frame s is attached, made of a magnetizable material: it is connected to the line c . The middle part of the frame carries a piece /, also made of magnetizable material. A flat steel spring k is attached to this piece / which carries the hammer /. The latter is opposite the free end of the electromagnet i. ίο The hammer I has the shape of an L, the lower branch of which is normally held by the spring k at a small distance from the part j . By hitting this part j , the movement of the hammer to the left is limited by / when it is attracted. On the other hand, the distance of the hammer from the core of the electromagnet i is relatively small. The air gap is therefore not too large and the magnetic line resistance is accordingly not too high. The hammer is provided with a rod m on which a weight η is arranged displaceably by means of a locking screw ο . It is subjected to the action of a spring v ¹ attached to a screw χ carried by the arm w of the frame ζ ; this can be used to change the period of oscillation of the hammer. By acting on the weight η and the spring v ¹ one can change the duration of each oscillation of I ; its suitable duration is given by the weight of the hammer and its various parts, as well as by the rigidity of the spring k . The course of the hammer, however, must not change within too great limits if one wants to maintain a regular interval between the interruptions.

The hammer carries a conductive elastic blade £, to the contact assembly e 'belongs and j to the one end a con- tact carries q, the one in the rest position' touches fixed contact · r. Located at the other end two contacts s, t, of 'which one, t, touches a fixed contact ν in the rest position, particular during the Toggle \.?, A fixed contact 11 is due whenever HE ■, when the hammer / is tightened. ', The three contacts r, u, ν are formed by screws and are thus adjustable. ; The line d is permanently tied to the lamella ρ , \ '; however, the manner of this connection is not shown in the drawing! posed. As for the contacts u, ν , j these are both connected to the line /. ;

The circuit of the electromagnet i

wircl fed by the current source α and consists of the line c, a line y, the fixed or movable contacts q, r,

the lamella ρ and the line d. '

The operation of this embodiment: i is the following:

Suppose that the hammer / in the drawn in Fig. 1 position Working ⁶ S place.

The circuit of the primary coil b of the induction coil bh is closed and is formed from the current source a, the line c, the primary coil b, the resistor g, the line f, the contacts v, t, the lamella />, the line d and again the power source a. \ The circuit of the electromagnet i is also closed and is formed from the current source ^ of the line c, the elec-; tromagneten i, the line _v, the contacts q, r, the lamella p, the line, d and the power source a.

The electromagnet i pulls the hammer / au, which breaks the circuits of i and b Ii in qr and tv ; but the circuit of bh is closed again in su. The hammer I swings, go- '^; left by the electromagnet i, after

back at the back, opens the circuit again: from bh to su and closes it again; in tv, then the circuit of the electromagnet i in qr is closed again, whereupon the same game begins again.

From the foregoing it can be seen that: when the hammer vibrates completely; two interruptions in the current, circuit of the primary coil b occur. ; The second embodiment fFig. 4) makes it possible to obtain four interruptions in the circuit of the primary coil b with one complete oscillation of the hammer /. Here the lamella ρ is shorter ^; and more rigid as before, and the contacts uv ' which come into contact with the contacts st are no longer normally solid, but on the contrary are each carried by an elastic and conductive lamella 1' and 2, respectively. The two lamellas 1 and 2 are attached to an insulated column 3 and each carry a contact 4 or 5; these can touch the contacts 6 or 7 carried by an insulated column 8 connected to the line f (Fig. 1).

The mode of operation of the second embodiment is as follows:

In the position shown in Fig. 4, the contact q of the lamella /) touches the contact r, so that the circuit of the electromagnet / is closed. The two contacts st, however, do not touch the contacts Hv, so that the circuit of the primary coil b is open.

As a result of the attraction acting on the hammer I, it moves to the left, the

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Contact q leaves contact r and opens the circuit of the electromagnet /.

On the other hand, the contact s of the lamella ρ comes into contact with the contact u of the lamella ι; The circuit of the primary coil b is thus first closed as long as s contacts the contact u and 4 still touches the contact 6; but then the circuit opens between 4 and 6 because 4 disconnects from 6.

When the hammer swings backwards from left to right, the current initially closes because s is still in contact with u and 4 comes into contact with 6. Thereupon the circuit is between.? and u opened, that s parted from 11 ; thirdly, the said circuit closes again because t comes into contact with ν as long as 5 and 7 are still in contact; finally the circuit is interrupted between 5 and 7 when 5 separates from 7, λ'οη at this moment the hammer Z swings again from right to left to its rest position; the circuit is again closed in 5 and 7, which come into contact again, as long as t and ν are still in contact; then it is interrupted one last time when t separates from r . With each complete oscillation of the hammer I , four closings and four interruptions of the circuit of the primary coil b occur . The wGame then begins all over again.

The flow times of the current in the primary coil h are given by the elasticity of the spring lamellae ρ, ι, 2 and by the spaces provided between the contacts s and 11, t and ν.

Instead of an electromagnet wound on one side, you can also use electromagnets of a different shape, such as horseshoe magnets.

The number of interruptions in the primary circuit can also be greater than that Twice or four times the number of times the hammer vibrates.

Claims (6)

Patent Claims: i. Hammer breaker for induction coils, characterized in that the number of interruptions in the primary circuit of an induction coil produced by a contact arrangement Multiple of the number of oscillations of the interrupter's movable hammer amounts to. 2. Hammer breaker according to claim i, characterized in that the Device consists of two contacts carried by a movable hammer and are in contact with two fixed contacts in such a way that there are two closings and two interruptions of the primary circuit when this hammer vibrates. 3. Hammer breaker according to claim ι and 2, characterized in that that the contacts are resiliently supported by the movable hammer. 4. hammer breaker according to claim i, characterized in that the Device consists of six movable and two fixed contacts, which work together in such a way that one four Closures and four interruptions of the primary circuit in one Vibration of the movable hammer receives. 5. Hammer breaker according to claim ι and 4, characterized in that two of the movable contacts (s, f) are carried by the movable hammer and come into contact with two further movable contacts (u, v) , namely the one (s) when the movable hammer in one sense, the other (t), as it moves in the opposite direction, wherein the movable contacts mentioned (u, v) the last two movable Contact Power (4, 5) move along with which they are permanently connected electrically and. which in the rest position touch the two fixed contacts (6, 7), but separate from them as soon as the hammer moves. 6. Hammer breaker according to claim i, 4 and 5, characterized in that that the first two movable contacts are resiliently separated from the movable one Hammer and that the four other movable contacts as well are arranged elastically. 1 sheet of drawings. dent;:!. cnDr-ucicT tN of the reichsdruckerei.