DE7421749U - Electric thermal switch - Google Patents

Description

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June 25, 197 *

Re: M 57 ^ / em - Applicant: John Myrddin

kZ _t Frame HaIslean, Arnhem, Netherlands

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^tt electrical thermal switch "

The innovation relates to an electrical thermal switch that works with a certain in advance the chosen tempo door interrupts a stress cycle.

The aim of the innovation is to create a thermal switch that has particularly small dimensions.

The innovation is characterized in that the thermal switch consists of a cylindrical housing in which two elastic contact organs are provided, one contact organ consisting of an open spring ring with a bent end, which is arranged on a fusible body made of thermally softenable material and with one against the spring action of the other contact organs directed tension against it is printed. Ώ & τ new thermal

• The switch has the advantage of ensuring safety an air opening of 2 mm when the flow is interrupted can be met at high temperature. The new Thermal switch is therefore suitable for safe use.

The cylindrical housing can have a cover with an elongated slot for holding the spring-ring-shaped contact element to be finished. The other elastic contact element can consist of an angularly bent leaf spring which is inserted through a slot in the upper part of the housing, with the upper side of the The narrower slot is the width of the leaf spring tile.

The housing of the switch preferably has an inner profile which supports the spring-ring-shaped contact element and contains an inclined surface against which the leaf-spring-shaped contact element is pressed. The fusible body can consist of a ring of fusible plastic _e

The innovation is explained in more detail below with reference to the drawing, in which an example of an embodiment of the new thermal switch is shown. Ss demonstrate:

742174I2I.H »

Fig. 1

a front view of the thermal switch partially in section,

Flg. 2

eitieti cut

3 shows a rear view according to FIG. 2, FIG. K shows a front view according to FIG. 3,

Fig. 5 is a section of the annular melting body of Fig «2, and

Figure 6 is a front view of the open spring

with umgisVogeneu ends.

In the game Ausführungsebei shown in the drawing, a thermistor 2 and a thermal switch 3 are housed in a tube 1 made of glass or ceramic. Metal protective caps k are arranged at the two ends of the tube 1, with openings through which the contact wire 5 of the thermistor and the contact wire 6 of the switch protrude. The contact wires 5, 6 are attached to the protective caps h, for example by soldering.

Vie Flg. 2 shows, the thermal switch 3 has a cylindrical housing 71 with an inner profile 8 with eiüex very sgfLäe YiS ·? S ^ S Heitwn des ritiÄfBniiigen Melt body Io and an elastic contact organ 11 is provided. The elastic contact element IX is made from a right-angled leaf spring »their

^ long part through a dovetail-shaped opening

13 is inserted into the housing 7. When assembling the switch, the spring 11 E.B. by means of a The pin down against the shaft 9, whereupon the ring-shaped fusible body Io with the contact formed for him ■ - usgsbsadsn * sls open sadexing «

dz-cint 6 is inserted into the housing 7, which then with a cover 14- is completed with a elongated opening 15 sum passing through the elastic

Contact organs 11 and to secure it against

turning is provided. The fusible body Io rests on the inner profile 8 of the housing 7 with the spring ring 6 surrounding it, the free end of which is fastened to the cap k by soldering. The electrical connection effected by the elastic contact elements 6 and 11 remains in place until the temperature rises so high that the melting body Io melts or softens, whereby it is compressed by the spring force of the contact elements 6 and 11. Then the ends move

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of the spring ring 12 towards each other, so that the leaf spring of the contact member 11 relaxes and moves upwards. This creates between the switch contacts an air gap with a size of at least 2 ram, which complies with the safety regulations.

The new switch can have the overall dimension of a usual fuse, namely 20 X 5 µm. As a result, if it becomes damaged, it can easily be removed and replaced with a new one.

Protection requirements - 6 -

Claims (1)

Il · » III »* * PROTECTION CLAIMS 1. Electrical thermal switch, characterized in that that in a cylindrical housing (?) two elastic contact organs are provided, one of which is a contact organ consists of an open spring ring (6) with bent ends, which consists of a melting body (lo) thermally softenable material and with a against the spring action of the other contact member (ll) directed tension is pressed against it. 2. Thermal switch according to Claim I _1, characterized in that a cover (lh) with an elongated slot (l5) for fixing the spring-ring-shaped contact element (6) is arranged on the housing (7). 3. Thermal switch according to claim 2, characterized in that that the other elastic contact member (ll) consists of an angularly bent leaf spring consists, which passes through a slot (13) arranged in the top of the housing (7), the upper side is smaller than the width of the feather. 742174821.1U4 ■ Ill · » ■ ' I * * Thermal switch according to one of Claims 1 to 3 »characterized characterized in that the housing (7) mi * one Inner profile (8) is provided, which supports the spring-ring-shaped contact element (6) 3, and which has an inclined surface (9) contains, against which the leaf spring-shaped contact element (ll) is pressed. 5. Thermal switch according to one of the preceding claims, characterized in that the fusible body (lo) consists of a ring of fusible plastic.