DE1048200B - Electromagnetic switch for triggering intermittent signals, in particular flashing signals for indicating the direction of travel of motor vehicles - Google Patents

Description

GERMAN

The invention relates to an electromagnetic switch for triggering intermittent Signals, in particular flashing signals for indicating the direction of travel of motor vehicles, with a one Magnetic core carrying the excitation winding, a switch armature and a hot wire, which is in a cold state the switch armature against a tear-off force also acting on this armature in its Holds rest position, in which the switching contact of the armature touches its mating contact, as well as with one the circuit of the hot wire switching control armature, which is on the same side of the magnetic core as the switching armature is arranged and on which an opening force counteracting the magnetic force acts.

In a known switch of this type, the switch armature and the control armature are on opposite sides Arranged sides of the magnetic core. The magnetic ones penetrating the magnetic core Lines of force close as useful flows on the one hand over the switching armature and on the other hand over the Control anchor. It is therefore necessary for the excitation winding to have a total flow that is necessary to attract the Control armature and to hold the switch armature is sufficient.

The invention has the purpose of a favorable design and arrangement of the two anchors Reduction of the required total flow through the field winding compared to the known Enable switches.

This is achieved according to the invention in that the control armature in its working position on the while in its rest position, the switching armature strikes such that it is in its tear-off movement takes that away. The magnetic holding force acting on the control armature acts on the Counter armature attacking tear-off force, so that the magnetic acting on the armature Holding force and thus the required total flow through the field winding is reduced accordingly can be. _

In the drawing, an electromagnetic embodiment is shown as an embodiment of the subject matter of the invention Switch with a switching armature and a control armature for triggering flashing signals with direction indicator lights shown schematically. 1 shows a view of the switch, and FIG. 2 shows a view of the two armatures in the direction seen of the arrow II of Fig. 1, and

3 shows another embodiment of the switch armature.

The electromagnetic switch according to FIGS. 1 and 2 has a U-shaped magnetic core 10, the free leg ends of the pole horns 11 and 12

Electromagnetic switch

for triggering intermittent

Signals, especially flashing signals

for travel direction display

of motor vehicles

Applicant:

Robert Bosch GmbH, Stuttgart-W,
Breitscheidstrasse 4th

Joachim Hess, Ludwigsburg,
has been named as the inventor

form and whose web carries an excitation winding 13. Opposite the front sides of the two polar horns a switching armature 14 and a control armature 15 are arranged. The switching armature 14 is in the Near one of its ends is hinged to the pole horn 11 by means of a leaf spring 16 and carries close a contact 17 at its other end. The control armature 15 is in its working position in a correspondingly designed rectangular slot-like opening 18 of the armature 14 and is suspended at one end of the switch armature 14 by a leaf spring 19 so as to be pivotable. At At its other end, the control armature 15 bears a strip-shaped one protruding beyond the opening 18 Insulating piece 20 on which a switching contact cooperating with the contact 17 of the switching armature 21 is seated. The two end sections of the switch armature 14, one of which extends over the suspension of the Armature and the other extending beyond the contact 17 are turned away from the magnetic core 10 in the Turned direction. The end section on the contact side has a slot 22 in which the piece of insulating material 20 is guided with its free end. In its drawn rest position, the control armature 15 is supported under the influence of the leaf spring 19 with its piece of insulating material 20 on the one facing away from the magnetic core End of the slot 22. At the bent end on the hanging side of the switch armature 14 is a hot wire 23 is anchored insulated at one end and via a resistor 24 to the contact 21 of the control armature 15 connected. The other end of the hot wire 23 is attached at 25 and depends on mass. The unheated hot wire holds the

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Switching armature 14 against the force of the leaf spring 16 in the rest position shown in Fig. 1, in which the switching contact 17 touches a mating contact 26 which is connected via a line 27 to the positive pole of a power source 28 is connected, the negative pole of which is connected to ground. The direction of the force of the two Leaf springs 16 and 19 are each indicated by an arrow.

The excitation winding 13 is at one end to the magnetic core 10 and at its other end Via a line 29 to the switching element of an arbitrarily operable changeover switch 30 for direction indicator lights 31 connected.

The switching armature 14 shown in Fig. 3 differs from the one previously described only in that, instead of the rectangular opening 18, it has a recess 32 on one of its long sides for has the control anchor 15.

The electromagnetic switch works in the following way: becomes the switching element of the changeover switch 30 is pivoted from its illustrated switch-off position into one of its two switch-on positions, so current flows from the positive pole of the power source 28 via line 27, contacts 26 and 17, armature 14, Leaf spring 16, magnetic core 10, excitation winding 13, line 29, changeover switch 30 through the switched on Direction indicator lights 31 to ground. The switched-on lamps 31 emit light. The magnetic core 10 is fully excited and pulls the control armature 15 against the force of the leaf spring 19 into its working position, in which it lies in the opening 18 of the switch armature 14 and with its switch contact 21 strikes against contact 17 of switch armature 14. As soon as contact 21 and 17 touch, the current also flows through resistor 24 and hot wire 23 to ground. The hot wire 23 gets warmed up and expands. As the expansion progresses, the tensile force of the hot wire decreases away. Accordingly, the switching armature 14 is together with the control armature 15 by the force the leaf spring 16 counter to the by the magnetic holding force of the magnet core 10 on the two armatures and the tensile force of the hot wire 23 acting on the switch armature 14 resulting from the resultant force its break contact position as soon as the resulting force has become smaller than the force of the Leaf spring 16. This turns the direction indicator lights 31, the excitation winding 13 and the Hot wire 23 de-energized. The control armature 15 is returned to its position in FIG. 1 by the force of the leaf spring 19 Drawn drawn rest position, in which he is with his penetrating through the slot 22 piece of insulating material 20 is supported on switch armature 14. The switched off hot wire 23 cools down and shortens. As a result, the switching armature 14, against the force of the leaf spring 16, with its contact 17 becomes the control armature 15 taking along, pulled against the mating contact 26, whereupon the game begins again and itself repeated as long as the changeover switch 30 is in one of its two switched-on positions.

Claims (7)

Patent claims: 1. Electromagnetic switch for triggering intermittent signals, in particular Flashing signals to indicate the direction of travel of motor vehicles, with an excitation winding load-bearing magnetic core, a switch armature and a hot wire, which in the cold state the Switching armature against a tear-off force also acting on this armature in its rest position holds, in which the switching contact of the armature touches its mating contact, as well as with a control armature switching the circuit of the hot wire, which is on the same side of the magnetic core how the switch armature is arranged and on. the one counteracting the magnetic force The opening force acts, characterized in that the control armature (15) is in its working position on the switching armature (14), which is in its rest position, strikes in such a way that it is at his tear-off movement takes those with him. 2. Switch according to claim 1, characterized in that the control armature (15) in one Opening (18) of the switch armature (14) lies and with its facing away from the contact side of the switch armature The end is hinged on the switch armature. 3. Switch according to claim 2, characterized in that the control armature (15) by a Leaf spring (19) is suspended from the switch armature (14). 4. Switch according to claim 2 or 3, characterized in that the control armature (15) has a has over the opening (18) of the armature (14) protruding Endafoschnitt one with the Contact (17) of the switch armature (14) carries cooperating switch contact (21). 5. Switch according to claim 4, characterized in that the control armature (15) with his End portion engages through a slot (22) of the bent end portion of the switch armature (14) and in the working position with its switch contact (21) a mating contact on the switch armature (14) touches while it is in the rest position with its end portion on the bent Supports end portion of the switch armature. 6. Switch according to claim 2, 3, 4 or 5, characterized in that the control armature (15) receiving opening (18) on the switch armature (14) is a longitudinal slot (Fig. 2). 7. Switch according to claim 2, 3, 4 or 5, characterized in that the control armature (15) receiving opening (18) of the switch armature (14) as a recess on one of the two longitudinal sides is formed (Fig. 3). 1 sheet of drawings © 809 727/68 12.58