DE1980283U - THERMALLY SECURED ELECTRIC SWITCHING ELEMENT. - Google Patents

Description

N 19 OO3 / 21o Gm. PHK.1005

/ NVPhilips ¹ CrIo eilampenf abriefe en

"Thermi30h geaiohertea electrical switching element".

/ i__ The innovation concerns a thermally secured

' electrical switching element, dae with inontugo links

ending stream feeding songs, by means of _. whose 'the element is on a perforated plate'

can be mounted with printed wiring, with 'between one of the StromzufUhrungsglieder and the switching element a peelable connection is present, which is mechanically' pretensioned by the spring force of at least one StromzufUhrungsglied.es. It is a thermally secure electrical switching element of the aforementioned kind is known, which is located in a through cavity in a prismatic electrically insulating body, ^ wherein an outstanding from the cavity terminal member

• ■■ J

PHN. 1005

-2-. ■

of the switching element attached to the end of a resilient power supply member by means of a fusible connection which extends parallel to the cavity along the outside of the prismatic body and in the vicinity of the

. at the other end in a hat in this body is supported and mechanically pretensioned. This known 'switching element

• has the disadvantage that when the connection is loosened by melting the distance between the power supply element and the connection element of the switching element is insufficient for many FgHe is. Furthermore, the separation is too imprecise, which means that different specimens of a certain type of the kind mentioned are relatively large among themselves. Differences in the amperage at which the fusible link is broken by melting while it is It has often been found that the switching element is already through strongly when the fuse link is interrupted Overheating has been damaged so it must be replaced got to. Ultimately, due to the dimensions of the cavity in the prismatic body, only switching elements of certain designs can be used. application forms.

i The innovation! relates to a switching element of the he. ■

'mentioned type in which these disadvantages are avoided and which can also be produced cheaply.

A switching element according to the Γ ^^ - Ξ ^ - i ₈ t characterized in that a first resilient power supply element consists of an elongated spring, which is supported and pretensioned in the vicinity of one end in an insulating body, the other end of which is mechanically fixed with the side of the switching device facing away from the fusible connection

• f -Ii i

"-ι-—

PHN.1005

elements 'is connected,' while a second power supply . member on which the fusible connection is located, an elongated body with the first power supply member of comparable dimensions, the one at the end remote from the fusible connection as well is supported by the mentioned insulating body, the arrangement being made such that when the melted

fusible connection, the part of the switching element detached as a result experienced a greater shift than that with the switching element mechanically firmly connected end of the spring, while each of the above-mentioned insulating body supported Power supply members on the side facing away from the switching element of this insulating body with a mounting member, in particular one, solderable fastening tongue, is provided

.An advantageous embodiment of the switching element according to the '; Neue £ ungJist. characterized in that the first and the second power supply element are leaf springs, while in a further development these leaf springs are identical and in the vicinity of the end facing away from the switching element are provided with cutouts which, together with cutouts at the ends of the strip-shaped insulating body, are releasable supports these feathers form. The separation accuracy of such an embodiment is surprisingly high, which is probably due to the simple construction, as a result of which a very easily reproducible geometry can be achieved in the assembly. '" The design of the insulating body as a strip with recesses that fit into the springs also enables

'"' -. ■ PHN. 1005

'' with the help of the same springs '' fuses for switching elements Manufacture of the most varied of lengths by using only one insulation strip of a different length becomes, which enables an economical production.

An execution example of the innovation iat shown in the drawing and will be described in more detail below ■ show Ea ;. "'

· Pig. 1 in isometric projection an execution O ,. forra of the thermally secured SohaltsLementes ^ after the . Innovation "...

, -Fig. 2 shows a side view of this switching element for Explanation of how the fuse works. ■. The exemplary embodiment shown is an electrical

tric switching element 1 second between the ends of leaf springs 2 and 3 ■ stretched, which _(at their other ends are truncated by an insulating strip. 4

'- The switching element 1, the b.B. an electrical resistance,

yr— can be a capacitor or a semiconductor element is with

Attach connecting wires 5 and 6. The end of the connection wire 6 is fastened in a recess 8 in the leaf spring 3 'by means of a soldered connection 7 indicated schematically. This soldered connection can be heated by the Y / arms developed by an electric current in the switching element 1 and transmitted via the connection wire. If there is a strong development of heat in the switching element 1, the solder 7 », so that the end of the connecting wire 6 does not melt

more of the end of the leaf spring 3 is held and breaks away. The length of the between the switching element 1 and the Lot 7 located part of the connecting wire

"M

¹ PHN.1005

■ »

-5-

"'■ 6' determines, under otherwise identical conditions, at which value of the current flowing through the switching element 1 the solder 7 melts. By adjusting the lung of the mentioned part, the current value that causes the melting can be selected. The other connecting wire 5 is with the bent end through the recesses 10 and 11 of the ·. Leaf spring £ and attached to this leaf spring, creating a mechanical solid connection between the

Q connecting wire 5 and the leaf spring 2 results. Will go through Overload of the Sohaltelementes 1 the. Connection loosened by Schmalzen, so jumps as a result of the pretension 'The springs 2 and 3, the end of the wire 6 from the recess

8, eliminating the in Pig. 2 is created by a dash- ^{dotted line * ~:} indicated position. The pretensioning of the springs 2 and 3 is obtained in that all the ends of the fastening of the switching element 1, which are provided with the recesses, are relative to one another

- ■ · be bent. Correct tension of springs 2 and

- *., and the correct position of the switching element 1 between the 'w · ·

Recesses result from the fact that during assembly

__ ■ a teaching is used in the whole. To in normal operation of the switching element 1 a good electrical contact between the connecting wire 5 and the leaf spring ensure that around the end of the leaf spring 2 ■ clamped end 9 of the connecting wire 5 also by means of a schematically indicated solder connection 12 attached to the leaf spring®. From the dash-dotted lines in Fi-o · .; 2 position shown with losgesohmolzener connection 7 further shows that "as a result of the mechanically solid Connection of the wire end 9 und'insequence of the almost q.ue-r to the

^^ - '"' j! -TT, V- A.

* ■■■: '■

PHN.1005

-6-

Direction of this spring extending longitudinal direction of the Switching element 1, the end of the connecting wire 6 to a distance b is shifted, which is greater than the distance a by which the end of the spring 2 near the release the connection 7 has moved. The leaf springs 2 and 3 are provided with a narrowed part 13 or 14 near the end facing away from the switching element. These parts 13 and 14 are arranged in recesses 15 and 16, which are open to the hand of the insulating strip 4 and from to widen the opening. The fact that the Stanchions 15 and 16 extend from the edge of the strip to the inside, the springs can be narrowed with the Slightly slide parts 13 and 14 into them and then turn them into the correct position. In the tensioned state of springs 2 and 3 are supported by the upper and lower edges' , the recesses in the springs that form the narrowed parts on the top or bottom of the insulating strip 4, whereby the leaf springs 2 and 3 at the point of their passage through the strip 4 an angle of about 45 ° Include with this. Below the insulating strip 4, the springs 2 and 3 end in fastening tongues · 17 and 18, · those through the narrowed parts 13 and 14 in the recesses 15 and 16 at such a distance from one another, held- "c: - *. be that this distance corresponds to the distance between holes 20 unc 21 in an insulating plate 19 with printed wiring in the form of conductors 22 and 23 · corresponds to which holes

and 21 the J3efe stigt tongues 17 and 18 due to their curved Shape can be introduced clamping. - 'To explain the exemplary embodiment, it should be mentioned that

■ .. PHN.1005

-7-

leaf springs 2 and 3 are e.g. about 0.25 mm thick

Made of phosphor bronze and can be about 2 cm long. The distance between the ends of the springs 2 and 3 can also be about 2 cm, while the thickness of the Isolieratreifenene 4, the z.3. can be made of hard paper, for example 1. mm sa'in can. For the sake of clarity are in the drawing ■ · several dimensions are not shown in correct proportions.

The current supply members 2 and 3, which in the described / - ■ embodiment as' identically designed leaf springs.

forms can of course have other forms.

/ '' The power supply element 2. Can e.g. 3. a rod-shaped one

γ ■
₍ / Be a torsion spring, in which case this will hold I at

a solution of the connection 7 laterally from the plane of the drawing is swiveled away. The recess 8 in the power supply element 3 must then of course * when using a connecting wire 6 be turned sideways. Also, the power supply element 3 does not need to be resilient,

but can, for example, be rigid. The very / ending ^x ^ ' glöichgestalteter smooth spring 2 and 3 in connection with an Iiolierstreifen 4, as is the case with the described AusfUhrungsbeispiel, however, allows an economical adaptation to uine variety of dimensions and properties of the Sehaltelementes 1 by z.3. the length of the strip 1 'is chosen differently. Using the same springs 2 and 3, it is also possible, for example, to use strips 4 or other bodies made of plastic in which the power supply elements, for example 3. are clamped with the trimmed end, ■ 'The ends of Stromz'ufUhrungsleiter 2 and 3 can be attached to the

m ι

VX -. 'VV. ■

Claims (3)

PHN.1005 * _. The side of the insulating body 4 facing away from the switching element 1 has mounting members other than the described soldering tongues 17 and 18, e.g. be provided with connector pins or the like. The mechanical, fixed connection between the connecting wire 5 and the spring 2 can also be established in a different manner. z.3. by welding, screwing or clamping. Furthermore, it is not absolutely necessary that the connection elements 5 / · "* -, - · and 6 are wire-shaped, _ they can, for example, also be cap-shaped, without the effects of the thermal. ' This significantly changes the security. Ι j S c h υ t τ, π. Η s t) r ü c h e: \ 1. Thermally secured electrical switching element, which is attached to ending in mounting members power supply members • ', with which Öas element preferably on a perforated plate with printed wiring can be mounted, being between one of the power supply members and the switching element has a fusible connection which is created by the spring force of at least one power supply element is under mechanical prestress, characterized in that a first resilient power supply element (2) from an elongated, at one end ' (15) supported and prestressed in an insulating body H) There is a spring, the other unde of which is mechanically 'fixed with the one facing away from the' fusible connection Side (5) of the switching element (1) is connected, while a second power supply element (3), * on which the fusible link UHj (T), an elongated one Body with the first power supply element (2) '■ l. I * 'Vf, / PHN.1005 —9— of comparable dimensions, which is also supported at one end by the mentioned insulating body (4), the arrangement being made such that upon melting the fusible connection the melted part (6) of the switching element experiences a greater shift than that end of the Spring (2), while each of the Stromsufführglieder on the remote from the switching element side of the 'insulating body is provided with a mounting member (17 or 16), in particular a plumb baren. 2. 'Switching element according to claim 1, characterized daduroh, "' that the first and second power supply members are leaf springs (2 or 3) are. 3. Switching element according to claim 2 _f, characterized in that the insulating body is a strip (4 ·) provided at the ends with recesses (15, 16), and that the leaf springs (2,3) are identical and have recesses at the end remote from the switching element (13,14), which together with the recesses mentioned, form the detachable supports of these springs in the strip.