DE1464419A1 - Electromagnet with a single actuation winding - Google Patents

Description

ALBRIGHT (KiGIF ^ iRS) LIMIl ¹ SD, 125 Red Lion Road, ToIworth, Surbiton,

Country of Surrey; .Jn; ,country

VIGSOE BEDGGCOD, The White Cottage, Parkers Lane,!, Iaidens Green,

Bracknell, Berkshire;

ERIC ARTHUR ADAH FAGAiI, Woodiaäns Farm, Cop thoma Cbniwon, Coprthorn ^

Country of Sussex.

Electromagnet with a single actuation winding

The invention relates to an electromagnet with a single Actuation winding, which in particular, but not exclusively, in electrical switches can be used with the help such Slektromagnete are operated. Such electric magnets are used in various forms wherever necessary is, a certain component as a result of the excitation of the solenoid winding with direct current or #AC to give some motion ajjgaiapuls.

The electromagnet and an armature, which is preferably arranged coaxially in the interior of the winding, set the corresponding component in motion when the winding is excited. In general, at. such magnet arrangements mechanical Eedern provided, which are assigned either to the armature or the component: so that, both the armature as. If the component is back in its original position, what about? Efcr.eger ^ _; t3jomÄreis., for: the 7 / icklu brochea wir <}., Derarjti ^; illokir ^ OÄagiieteeir have a, very gel'uafiMl »and wmawa frequently, in electric or i»; elekfectttgitem Sehal1? e ^ iQ vemendöt,

BATH ORIGINAL

In the previously known electrical switches of this type, the excitation of the electromagnetic winding causes the closure the main contacts of the switch, which are then closed as long as Position are held v / ie the ./wicklung is excited. the Contacts are under the influence of springs which they move into the open position Return position and return to this position under the Effect of the associated everyone back as soon as the electromagnetic is de-energized. In these known gate directions, the power supply for the magnet winding must necessarily be upright Maintain the contacts in the closed position to keep; this results in a relatively very large expenditure of energy.

The invention is based on the object of creating an electromagnet with a locking device that is always in operation occurs when the coil is excited, and with another Device that is used to return the armature of the electromagnet as soon as the .Vicklung is de-energized.

It is also part of the objective of the invention, an electrical To create switches with electromagnetic actuation, in which A device is used to keep all contacts in the closed position with a single winding, regardless of the excitation of the electromagnet, so that the circuit for the, Winding can be interrupted and thereby a considerable j Reduction in power consumption occurs. ,. j · ■■ ·. '

An essential characteristic of the electromagnet is often the charge

• BATH

as a result, there are locking devices associated with your anchor, which are latched by the movement of the anchor, and depending on a momentary excitation or immediately the subsequent unregulation of the maga development are unlocked, a special device is used to de-excite the electric tangent immediately after it has been momentarily excited bring about and a return device is used to return the armature to its original position without that the locking device needs to be actuated after each individual de-energization of the winding.

The subject matter of the invention remains a component that as a result of a initial momentary excitation of the magnet winding has been moved is in the new position until the development is excited again is to operate the locking device in the sense of an unlocking,

In a preferred embodiment of the subject matter of the invention the circuit in which the magnet winding is located depends on automatically opened by the actuation of the locking device after the winding has been excited, so that thereby de-excitation is brought about. The electromagnet possesses Changeover contacts which are actuated in such a way that they switch the circuit for the magnet winding in response to the actuation of the locking device interrupt and thus cause the de-excitation of the magnet winding, but at the same time another circuit prepare in which the magnet winding is also located, and . Which is closed when a switch is actuated and the winding is then applied to a suitable power source in order to restore it. Err.eroin,> hfcrbeufufuzuen, '.

909806/0476 bad omo.N «.

In a second embodiment of the invention, the subject matter can the locking device with the help of a piston or Push button can be operated by hand, which is attached to the armature of the electromagnet and in the event of a power failure actuated in the excitation circuit for the magnet winding can be.

According to a further idea of the invention, there is a single magnet winding assigned to an electrical switch whose main contacts depend on the excitation of the magnet winding. get into the closed position and in which a locking device is used to keep the main contacts in the closed position Hold position while special assigned toggle contacts are provided in the development group that are equal to be operated in good time with the locking device so that they can interrupt the excitation circuit for the magnet winding, without having to open the main contacts of the switch.

The arrangement in this embodiment is such that if the magnet winding is further excited via the changeover contacts, the locking is released so that the main contacts can be returned to the open position under the action of a spring assigned to them.

The locking device is the armature dee magnets so assigned that upon subsequent energization of the Magnetwickluag .the locking device is actuated in the sense that they ale di · main contacts of the switch both close, can öfftien also, while the actuating device for the switch "" di " are assigned to the 'anchor, and simultaneously with the actuation of the ' ■ "

909808/0478

BATH ORIGINAL

Locking device take effect * the opening or closing the circuit of the magnet winding causes.

The electrical switch can also be made with the aid of a piston or a push button, which is attached to the anicer of the electromagnet, so that, for example, in the case of a In the event of a power failure in the excitation circuit, the main contacts and the associated locking device, as well as the auxiliary contacts can be operated by pressing down the piston or push button. Such a control for the switch would enable it to be used, for example, in an elevator control could be, in which the piston or the key as a result of attacks ^ on a fixed stop the main contacts of the Switch in the sense of their opening and thus in the sense of an interruption of the main electrical circuit would be actuated.

The electrical switch with an electromagnet according to the invention is particularly suitable for remote control purposes from a distant point and with the help of one or more ~; rer push buttons that are in the magnetic circuit and its Intended to influence arousal. For example, it can be a normal ^ wise open push button can be arranged, which when actuated closes the excitation circuit for the magnet, and its excitation ~

i supply via the "on ^ position of the Hjj.lfkontakte switches on, the j

arranged inside the switch housing or outside the housing and * An excitation of the magnetic winding causes the main contacts of the switch to be closed by moving the armature j, in * such movement the locking device is also actuated, and the il ^ if ^ kootalcte If the "off" position is * and clamiG, the de-excitation of the magnet winding is effected. the

ORIGINAL

The main contacts of the switch "remain closed and become held in this position by the locking device; a further actuation of the first push button influences the main contacts of the switch or the magnet winding now in no way. A second normally open push button lies in a line that connects the magnet winding with a Power source connects and also the contact of the auxiliary contact in of its off s setting, this second push button is therefore used actuated, then the magnet winding is energized again to move the armature of the magnet and the unlocking of the locking mechanism to cause the opening of the main contacts of the switch and the resetting of the changeover auxiliary contacts into the "on" position and thus the renewed de-excitation of the * magnet winding because the first push button is in the normally open position. So the switch is Now in a position in which it can be operated again as described above, i.e. H. it will be by pressing the first The main contacts are closed with the push button, the locking device mechanism operated and the auxiliary contact switched so that the It is guaranteed that no current flows through the magnet winding as long as the main contacts are closed.

The execution form with two. Snap fasteners in particular are everywhere there from Hutzen, where one of the two push buttons is necessarily housed in a relatively difficult to access position must be to prevent unauthorized operation. Sc can z. B · the first push button or "power on" push button, such as it is to be designated in the following to be permanently accessible, " while the second push button or "off" push button in one

909808/0476

BATH

ment can be accommodated, in which it can only be operated with special 'authorization, so that it is prevented in this way that the switch to interrupt the circuit used after the switch has been turned on.

In the following description of the invention, reference is made to it to be described in more detail on the drawing.

In the drawing, an electrical switch with an electromagnet according to the invention is shown, which is used as an example is to be assessed, especially since the solenoid with a single winding according to the invention is also used in other devices but its mode of action can be found in connection with the easiest way to explain it to an electrical switch.

In the drawing is:

Fig. 1 is a view of a longitudinal section through a switch with an electromagnet according to the invention,

Fig. 2 is a _t of FIG. 1 sectional view similar to the structure of the winding and the execution ersieht the armature of the switch from the one clear

Fig. 3 is a view of a section along line A-A of Fig. 1, the shows a changeover contact with cam control,

Fig. 4 is a view of a section along line B-B of Fig. 1;

Fig. 5 is a schematic representation of the locking device ^ of the main contact and the Usi switch contacts when the Main contacts and changeover contacts that are calibrated in the "on" position,. "

»■. ■ "

Fig. 6 shows the same representation with closed main contacts and switched on Umechaltekontukten, BAD OR / GjNAi

909808/0478 - β - '

7 shows an illustration with the main contacts closed in the case of mechanical Locking and in the state in which the Uiaschschaltkontalie are in the "off" position,

3fig. 8 shows the switching state in which the main> contacts are closed and the changeover contacts are in the "off" position,

9 is a diagrammatic exploded view of the cam for Actuation of the changeover contacts and the cam surfaces of the locking device and

10 is a circuit diagram from which it can be seen in which way the magnet winding via the switching contacts for the "A" - baw. "Off" position and the push buttons for "On" or "Off" can be applied to a power source.

As FIGS. 1 and 2 show, the switch consists essentially of a U-shaped yoke 1, in which a magnet winding 2 is accommodated, which is wound onto a bobbin 3. The yoke 1 is screwed to a rear plate 4- with the aid of screws 5. 6 with the armature of the electromagnet is designated. A control button 8 for manual operation is screwed onto it, for example with the aid of a screw 7. The armature 6 is held with a sliding fit in bearings 9 which are attached to a fixed bearing support 10 which lies between the armature 6 and the coil carrier 3. The armature 6 has an axial bore 11 in which a bushing 12 is accommodated , -which in turn has a shoulder 1 $ for the purpose of cooperation with a corresponding shoulder 14 on the armature body 6, such that the bushing 12 from the armature 6 to can be moved forward when the "button 8 is pressed or the magnet winding is energized. The Ab- '

909808/0476 bathroom original

end wall 15 of the socket 12 has a central bore 16; Inside the socket 12 there is a rod 17 'around which a helical spring 18 is wrapped, which is held between the end wall 15 and a further socket 19 which is shrunk onto the socket 12. The rod 17 carries at one end an extension 20 with a reduced cross-section, which extends through the opening 16 in the end wall 15 of the socket 12. At the other end, the rod 17 has a further part 21 with ver. reduced cross-section, which extends through a molded piece 22 for a contact part to which the movable contact 23 of the switch is attached. The arrangement for the main contact 23 consists of a contact carrier plate 24 which carries a pair of movable contacts 25 »26 on its one surface, and the plate 24 is screwed to the rod 17 by means of a bolt 27. The Formatüok 22 has a flange 28, behind which «; Shoulders a leaf spring 29 is in contact with the plate; Washers 30 are located between the flange 28 and the end of the rod 17 'while another washer 31 is located between the screw connection and the fitting 22.

The fixed contacts of the main contact arrangement are indicated by j in FIG

and 33 denotes and arranged so that they come into contact with the contacts 23 and 26 as soon as the button 8 is pressed or the magnet winding 2 is urged , such that the Kontaktanord voltage 23 moves forward on a part to be described later will. The contacts 32, 33 are reasonable to terminals 34 and 35> ■ ». ·. ·, ■■ ■

closed, and »wipe the washer 31 and the

37 the switch reads a coil spring 36.

Iifcf legenden aollea ttunraifJ interlocking device «!! sum feet

hold the contacts 25 and 32 or 26 and 33 in the closed position so that the cam-actuated unit switching contacts are described in more detail, as can be seen from FIGS. 1 and 2, a number protrudes of lugs 38 out of the socket 19, each of which has a curved cam surface 39 which _: serves to cooperate with the crouch surfaces 40 on a locking part 41 (see also Fig. 9) which is slidable and rotatable on the rod 17 is housed inside the housing 4-2, which in turn is attached to the rear plate 4. The cam surfaces 39 and 40 are normally interdigitated, as can be seen in FIGS after pressing the button 8 or energizing the magnetic winding 2 come into engagement with each other in order to cause a rotary movement of the locking part 41 and the cam 42 attached to it, as will be described in more detail later an inclined surface 44 is housed inside the housing 45, which in turn is attached to the rear plate 4 . The stop 43 is normally located in a slot 46 in the locking part 41 and serves to prevent a rotational movement of the locking part 41, which is

■ i

Stepped parts 47, which will be explained later . A coil spring 48 wrapped around the rod 17 lies between a shoulder on the locking part 41 and a washer 30, while a cam 42 protrudes lugs 49 and cut-out parts 50 (Fig. 9 ), wherein the coil carrier βο is arranged that it comes into engagement with a pin 51t which is arranged on ne "rocker arm; as soon as the contacts" 251 32 and 26, 33 are closed , and the letctereo

909808/0471

BATH ORIGINAL

are arranged so that they are with the pin on the rocker arm arm 52 come into engagement when the aforementioned Iiontalsie are in the open position shown in Figs.

From Fig. 3 it can be seen that a coil spring 53 is arranged between the rocker arm 52 and a stop pin 54- on a plate 55 which is attached to the front of the rear plate {Fig. 1 and 2). A linkage 56 made of electrically conductive material connects the stop pin 54 to the rocker arm 52 and a contact 57 is provided on the lever arm 52 which can come into contact with a fixed contact 58 which is fastened on a stop pin 59 of the housing switch. The contacts 57 and 58 are closed when the pin 51 engages the cut-out portion 50 of the cam 42, as shown in FIG is. Another contact 60 is located at the end of an elastic lever 61 on the rocker arm 52 and serves to meet a contact 62 which is mounted on a stop pin 63 which in turn is attached to the switch housing. Contacts 60 and 62 are open when pin 51 engages a cutout portion 50 of crouch 42, as shown in Figure 3; and they are closed when the pin 51 engages a high portion 4-9 of the cam 42 in general. Bas means that the contacts 57, 58 are closed when the contacts 60, 62 are open, and vice versa; contacts 57, 58; 60, 62 represent the changeover contacts of the auxiliary parts of the switch. Terminal connectors 64, 65 ... serve for the electrical connection of the pins 59 * 63 with the homes 66, 67 and a further connection socket is at 68 in FIG. 4 drawn in · ww «β OS / 04 7 β ■ ■ ■■.

BATH

The, the operation of the main contacts depending on the press'dee button 8 or on the ;. Switching on the excitation or «performing the de-excitation of the I agnetwicklungs 2, the locking of the main contacts in the closed position and the effect of the switch contacts to cause the de-excitation of the magnet winding after actuation of the locking mechanism to hold the main contacts in the closed position should now be in particular with reference ^m to Figs. 1, 2 and 3, 3- connection with the ßchematischen representations according to FIGS. 5 to 8 are described in detail in detail.

Assume that the main contacts are open, as shown in FIGS. 1 and 2, and. the excitation winding is de-excited. Then, pressing the button or energizing the magnet coil initially causes the armature to move axially forward, taking the bushing 12 with it, and, because the bushing 19 and rod 17 are attached to it, the contact assembly 23 to move moved forward to close the main contacts 25, 32 »26, 33. Since the fixed stop 43 is arranged in a slot 46 of the locking chamber 4-1, the latter is held against rotation during the initial movement of the armature 6 and the contact arrangement 23. 5 shows the starting position schematically, in which the main contacts are still open and the stop 43 is still in the slot 46. In dieeer position befin- · which the switch-over in the "on ^w -ßtellung required to the excitation of Magnetwickluag 2 herbeisufuhren, that the contacts 57» 58 are closed and the contacts 60,62 are geöffne't how this Fig. 3 shows

After closing the main contacts, the continued

909808/0478 _BAD original

Excitation of the magnet winding or the pressing of button 8 so that the armature 6 continues its forward movement and takes the bush 19 with it {the cam surfaces 39 of the bush 19 interact with the cam elevations 40 of the locking part 41 and push the latter further in the axial direction until the stop 43 emerges from the slot 46 in the locking part 41. The crouching parts 38, 40 are now in a position in which they can cause the locking part 41 and the cam 42 connected therewith to rotate. Forward movement of the compression of the coil spring 48 and the gebogerea leaf spring 'performs this 29 · At this point, the switch-over contacts remain in the ^w A ^w position, and the main contacts remain due to the j exerted by the forward motion of the armature pressure CLOSED-l sen · Biese- FIG. 6 shows the intermediate position. The cam engagement of the surfaces 39 and 40 leads to a rotation of the locking part 41 by 90 ° the position shown in Fig. 7 position is returned, in which the stop 43 behind a ausgeschnittfneu'Teil latches 47 of the latch member 41 and in this fei * · rotation of this part is prevented. This position is shown in Fig.? · Gezeigt..Obwohl the main contacts 25, 32 remain 1 26, closed 33 "were now the switch-over to the" Aue "-8telluag moved to the de-excitation of the solenoid coil 2 bring. The · was caused by the rotation of the cam 42 , duroh which »in height part 49 of the nook in contact Wt d ·» pin 91 ΐκφψ vm ti ·· actuation of the rocker arm β 52 a * btwlrk «^ ttltf> UAu» tb df »contact 57 away from dta contact 58

tekontake are in de ^ i circuit of the magnet winding, causes. the opening of the contacts 57 »5 & the de-energization of the magnet winding. 2, but since the stop 43 is at this point in the cut-out part 47 of the locking part 41, the main contacts 25 »32; 26, $ 3 held in the locked position, the is shown in Fig. 7 without it being necessary to keep the magnet energized, as in the previous arrangements with a üLektromagneten was required.

In Fig. 10, the changeover contacts are designated by α and B, the associated movable contact is in the "A" or "On" position, which is connected to the positive terminal of a power source via the switch-on pushbutton 69, which has already been mentioned above. When the button 69 is pressed in the sense of a switch-on, the magnet winding 2 is ^{excited via the M} A ^w position (A) of the changeover contacts and the line 70 in order to cause the main contacts 23 »32, 33 to close and thus to actuate the locking mechanism, such as it has been described above. The lock is made so that the Umsehaltekon contacts in the "off" - or go "order, so that the magnetic coil is disconnected from the power source for the excitation Another pressing dee knob 69 in terms of intervention affects the switch contacts in all. any way. Now is but another push button 71 '., (the so-called off-switching push button, which was briefly mentioned above) in the newspaper to the negative terminal of the power source, "were so the Uaischaltekontakte in the" off "position (B) moved, then the magnet winding can be energized by new 71 ".2 by pressing the AUBachaltknopfeil to the main contacts su open | the Ümachaltekoatakte In the" Jttn "position aurüokBubewegtn,

aOI | Ö | / O47l

BAD ORIGINAL, i ^

this will be described in the following.

If the contacts are in the position shown in FIG. 7, the magnet winding 2 is excited or pressed of the button 8, that the armature moves forward and takes the bush 19 with it again, whose Ivockeaflachen 39 the Woekenflachen 40 of the locking part 4-1 grasp. At first there will be a Rotational movement of the locking part 41 is prevented because .the stop 43 in the cut-out parts 47 of the locking part 41 is held, the continued forward movement of the bush 19, meanwhile, causes the locking part 41 forward through engagement with cam surfaces 39 and 40 and if necessary the stop 43 is pushed out of the cut-out parts 47 of the locking part 41. This position is. reproduced in Fig. S; now the locking part 41 is free and can move when the ent- ' speaking cam surfaces carrying the cam portion 42 in rotation offset, whereby a cut-out part 50 is placed opposite the pin 51 (Fig. 3) · The contacts 57t 58 » 60, 62 now get into their initial positions, like ßie

i are reproduced in FIG. 3, and the locking part 41 comes under the action of the springs 29 and 48 again into the position shown in FIG. 5, in which the stop 43 is once again in; engages the slot 46 in the locking member 41 to prevent its rotation. In this position of the switch ■ the main contacts are open and the switchover contacts are in. , So that therefore the magnetic coil on pressing the knob 69 in. Of Einecbaltrichtuiig in need of new cases are energized been returned ^»l LSIN ^ff -Stellimg (position ^M A" of FIG · 10)

can * ui üie the Harapfckontakt the switch ^wi f $ ff _n 5} feiSiijiii ·

- 16 -

A switch of this type can be used as an isolation switch. or optionally as limit switch or limit switch, in addition to its many other uses, and as mentioned above, it can also be used on electrical Paths can be excited and released, but it can also be operated manually if the energy source fails.

Such a switch can be either with direct current or with Alternating current are operated and, if one uses alternating current, then due to the fact that the winding is only during remains excited for a short period of time, avoids that a noise is generated as a result of the oscillations of the excitation current, or as a result, that the anchor rattles. Otherwise the switch cannot

can be switched off by a subsequent actuation of the push button in the sense of a switch-on, if the changeover contacts have been moved to the "Off ^rr position and the main contacts have been mechanically locked, but it cannot be switched on by pressing the button in the sense of a switch-off If necessary, the switch can be excited electrically and triggered manually or vice versa, or it can be excited and released electrically with the aid of one or more external control circuits »

Of course, the subject of the invention can be manifold Modified manner and is not limited to the embodiment described there.

Manner and is not shown in daa and j.

So it should be clear for example that fitr solenoid u FTFE ■ _"of the invention, despite being in its essence and in its Wirkünge-" · "

909808/0476 _BAÜ original

- 17 - ■■■ ·

as described in connection with an electrical och switch and in this exemplary embodiment in connection with a
! Push-button control has been explained, when used to actuate any other component which is in connection with the armature, controlled in a similar manner by means of such push-buttons and in cooperation with switching contacts in the looping loop of the winding from a remote point
can be.

BATH ORIGINAL

■ Μ ■ ** Λ Ζ it

Claims (1)

64419 Claims Μ · \ Electromagnet with a single operating winding and one latch connected to the armature of the electromagnet ^ -. device, characterized in that the 'locking device actuated by the movements of the other (6) and in Dependence on the current state of excitation or the subsequent state of de-energization of the magnet winding (2) is solved, the de-excitation of the I / Iagnetwicklung.after each individual momentary excitation and the actuation of the device for returning the armature to its initial position after each de-energization of the winding without actuating the Locking device takes place. 2. Electromagnet according to claim 1, characterized in that the locking device has a rotatable locking part (4-1) which moves with the armature (6) and moves at a predetermined point of the. Forward movement of the armature rotates, do an actuation of Umsehaltekonifen (57 j 58; 60, 62) to bewir ken, which are in the circuit of the magnet winding and serve to actuate the excitation circuit for the magnet winding always au when the locking device is dependent? by the excitation of the magnet winding has been put into action . 3 · Electromagnet according to claim 1, characterized in that d * B die 909808/047 « BATH ORIGINAL Changeover contacts (57 »58; 60, 62) so with the locking device are connected that they can be operated simultaneously with this. 4. Electromagnet according to claim 1 and 2, characterized in that that the initial excitation of the magnet winding (2) is a partial rotation of the rotatable locking member (41) for actuation the changeover contacts the locking of the locking device and the interruption of the circuit of the Magnet winding causes, while the further excitation of the Mag-! net winding rotates the rotatable locking part (41) further, around the unlocking of the locking device and the Eiickstellung of the changeover contacts and the armature (6) in their To bring about initial positions. 5 Electromagnet according to one of Claims 1 to 4, characterized in that draws that the electrical line for the supply of the excitation stroma takes place in the magnet winding (2) via a contact of the changeover contacts and a first switching device while the other line via a second contact of the changeover contacts and a second switching device is performed. 6. Electromagnet according to one of claims 1 to 5 »characterized« that the actuation of the locking device depending on the excitation of the magnet winding (2) or '_ Is controlled in response to a connected to the armature (6) is manually operable device. 909808/0478 7. -Electromagnet according to one of Claims 1 to 6, characterized in that indicates that the locking device has an inside of the housing (4-5) for the jilektromagneten fixed ^ Stop (43) and a cam (42) is assigned, which moves together with the .aiker (o) and that the cam surfaces: υ (49, 5 &) the locking device via a pin (51) ' steer. 8. Electromagnet according to one of claims 1 to 7 »characterized in that the cam surfaces (39) of the cam (42) with the cam surfaces (40) on the locking device so _; work together so that the locking mechanism during the initial advance; averaging device until disengagement from the stop .erfolgt; - · ■ followed by a rotation of the locking member (41) by the interaction of cam surfaces and the Ifockenfläohen ctes locking member (41) brought about v / ith _r b ^ s the off chi ag. (43) Holds the locking device in place in a cut-out part (46) of the locking device to prevent the stop from rotating. -. ' 9 · Electromagnet according to claim 7j, characterized in that the with the cam surfaces (49, 50) of the cam (42). working together .Pin (51) the changeover contacts via a rocker arm (52) operated in such a way that when the magnet winding (2) is excited, the rotation of the cam contacts the Uiischaltekon • operated to separate the winding from its power source. 909808/0476 -, - ;. · <- ■ 21 - BATH ORIGINAL 10 .. Switch for electromagnetic actuation with oinen iClektromagneten with a single actuating winding and a locking device connected to the armature of the electromagnet, characterized by main contacts for the winding, which are used when the magnet winding is energized in the closed To be brought position, and a locking device for! Hold the Hauptkontükte in the closed Position and further characterized by switching contacts located in the circuit of the excitation winding, the be operated simultaneously with the locking device, so that they interrupt the excitation circuit of the ilagnetwicklun ^ without having to open the main contacts of the switch 11. Switch according to claim 10, characterized in that the main contacts of the switch by the movement of the armature of the Electromagnet as a function of the excitation of the magnet winding be brought into the closed position and the locking device including a rotating The rope moves with the anchor, the rotational movement up to a predetermined point in the forward movement of the Armature takes place to the Umsehaltekontakte in the excitation circuit the iiagnetentwicklung to operate, and the main contacts in the to lock closed position 12 · Switch according to claim 11, characterized in that the further excitation of the magnet winding after the initial excitation or after actuation of a manual switch the further • ■ ■ 9O08Ö & 7G476 bad original. Causes rotation of the rotatable part of the locking device, which in turn unlocks the locking device and resets the changeover contacts and the main contacts to their original positions. Use of an electromagnet according to one of Claims 1 to 9 an electrical switch with a single actuating winding and one with the armature of the electromagnet connected locking device. 909808/0476