EP1978598A2 - Connecting device for an electric hot plate and electric hot plate - Google Patents

Abstract

The device (19) has multiple electrical connection types (21) arranged in an isolating housing (20). The connection types include ferrule terminals for inserting a connection cable. The ferrule terminals consist of a metal sheet and are bent such that the ferrule terminals are closed on three sides. A fourth side of the ferrule terminals is closed favorably by a part of the housing, so that the connection cable is not moved laterally from the ferrule terminals. The ferrule terminals exhibit a distant section that is stuck out from the housing for an electrical connection. An independent claim is also included for an electric hot plate comprising a cover.

Description

The invention relates to a connection device for an electric hotplate, wherein the connection device comprises an insulating housing in which a plurality of electrical connections are arranged and fastened, wherein the connections comprise connection sleeves for inserting a connection cable. Likewise, the invention relates to an electric hotplate with such a connection device.

It is for example from the DE 198 21 140 A known to make a connection device for attachment to the underside of an electric hotplate for their electrical connection so that a plurality of metal lugs are mounted in a ceramic body. The metal lugs stand out in one direction with plug-in lugs out of the housing, and in another direction with welding lugs on which heating conductors of the electric hotplate can be welded.

Furthermore, it is from the DE 40 08 830 A It is known to provide a connection device with an insulating ceramic housing on an electric hotplate in which a connection sleeve is seated. In this connection sleeve from one side of a heating element of the hotplate and from the other side a connecting cable is inserted and then fixed by means of a Schraubklemmung.

Task and solution

The invention has for its object to provide a connection device mentioned above and an aforementioned electric hotplate, which disadvantages of the prior art can be avoided and in particular a versatile and advantageous and easy to use connection option can be created.

This object is achieved by a connection device with the features of claim 1 and claim 3 and an electric hotplate with the features of claim 12. Advantageous and preferred embodiments of the invention are the subject of further claims and are explained in more detail below. In this case, in particular the features which are enumerated for the connecting device can be essentially combined with one another as desired within the scope of the invention in a connecting device according to the invention. The wording of the claims is incorporated herein by express reference. Furthermore, the text of the priority application DE 102007017456.1 of 4 April 2007 by the same applicant by expressly referring to the content of the present description.

According to the invention, in a basic embodiment, a connecting sleeve made of sheet metal and is bent so that it is mostly closed or at least three sides. Advantageously, the fourth side is closed by a part of the housing, so that a Connecting cable or the like can not be moved laterally out of the connection sleeve. The advantage of such a production of a connection sleeve for an electrical connection to an electric hotplate is in the simplified and cheaper production compared to known connection sleeves, which are made of solid material and in which the interior of the connecting sleeve must be drilled out, for example. In an advantageous embodiment of the invention, the connection sleeve can even be closed circumferentially or on four sides. As a result, not only, as described above, a lateral moving out of a connecting cable is prevented. In addition, an electrical contact is ensured in each position with a clamping attachment of a connection cable in the connection sleeve.

In another basic embodiment of the invention, as described in claim 3, a connection sleeve having a protruding portion which protrudes from the housing or protrudes from the connection sleeve to produce an electrical connection thereto. Thus, therefore, there is the possibility, in addition to an electrical connection by inserting a connecting cable and possibly other electrical conductors, for example, the heat conductor, in the connection sleeve to use this standing out section. This will be explained in more detail below.

According to a first basic embodiment of the invention, the protruding portion may be part of a plug connection. For example, it can form a plug-in connection sleeve into which a plug connection lug, for example a connection cable for an external electrical connection to the electric hotplate, can be inserted. Such a plug connection lug can be formed out of the abovementioned metal sheet during one-piece production, in particular by embossing, stamping and bending. Alternatively, it can be fastened or welded as a separate part with it, admittedly the effort is greater here.

According to an alternative embodiment, the protruding portion may be a flat or straight metal part. On the one hand, the section may be a welding flag, in particular for the connection of an aforementioned heating conductor in the electric hotplate. On the other hand, the protruding portion may be formed as a plug connection or plug connection lug for a plug connection. A connection cable with a corresponding plug-in connection sleeve can be plugged onto such a plug connection lug. Especially in a configuration in which both a connection sleeve and a plug connection, in particular a plug connection lug, are provided as an electrical connection to the outside or for a connection cable, great variability can be created. On the one hand, a connection cable can be inserted as a bare cable, possibly with a wire end ferrule, inserted into the connection sleeve and fastened. Alternatively, a connection cable with plug contacts, in particular a multiple or group plug, be connected via plug connections with the electric hotplate. Such an electrical connection can be designed quickly, easily and under certain circumstances also interchangeable.

In an embodiment of the connection device can be provided that a connection direction, ie a plug-in direction for a connection cable or the course of the connection sleeve on the one hand and the protruding portion on the other hand are the same as a plug connection. This means that a connection cable can always be brought out of the same direction and connected to the connection device. However, it is also possible within the scope of the invention to deliberately deviate from this, for example for each desired different connection directions.

In an embodiment of the invention, it is also possible, especially in a connection device with a protruding portion for an electrical connection, herauszuarbeiten the connection sleeve made of solid material. The connection with a protruding portion can then be made either subsequently by connecting the two parts together, for example by welding. Alternatively, for example, as a casting, the parts can also be made in one piece.

In an embodiment of the invention can protrude from a connecting sleeve for a very diverse applicability both a welding lug, to which a heating element of the electric hotplate can be welded, as well as an aforementioned plug connection. Advantageously, the welding lug on the one hand and the plug connection on the other hand extend in different directions or protrude in opposite directions. Thus, the respective connections do not interfere or are easily accessible. It can be provided that a plug-in connection protrudes directly next to a connection sleeve, in particular it can be a continued wall of a connection sleeve. This is particularly advantageous if the connecting sleeve is bent from sheet metal as described above. Since usually an electrical connection is made either by inserting a connecting cable into the connecting sleeve or by attaching a plug, no problem of a mutual obstruction of the electrical connections is to be feared.

Although it is possible that a connection or a connecting sleeve is formed individually with their respective individual components, which may be connected to each other. Advantageously, however, it is worked out from a single piece, advantageously made of sheet metal and bent accordingly. So a simple and inexpensive production is possible because no major exciting processing steps are necessary.

It can be provided to clamp a connecting cable in the connecting sleeve with a clamping device. This can be a detachable one Clamping device may be like a screw, alternatively a self-locking clamping device.

On the housing of the connection device advantageously a plurality of identical or identical connections are provided with identical connection sleeves. They can be provided side by side with parallel connection directions and alignments. In a further embodiment, they can each have the same distance or at least a housing, which consists for example of ceramic or steatite, be designed so that connection sleeves can be arranged with the same distance in it. It can coding options or the like. be provided on the housing, which prevent the confusion of a connection with other terminals of another electric hotplate, for example by omitting an occupancy.

A connection sleeve or a connection can be fastened to the housing by protruding bending or locking straps. According to a possibility in which the connecting sleeve is machined out of sheet metal, a section, which in particular branches directly from the connecting sleeve, can pass through a recess in the housing. This section is bent over or twisted to securely fasten the ferrule to the housing.

In an electric hotplate according to the invention, a connection device described above is arranged on its underside, for example on a cover of the electric hotplate, which may consist of sheet metal. For this purpose, the housing is advantageously secured to the electric hotplate, for example by protruding latching lugs or the like, which can be inserted into an opening on the electric hotplate or its underside. In an embodiment of the invention, it is possible to fix the connection device to the electric hotplate in such a way that the heating conductors of the electric hotplate are connected or welded to the connection device. For this purpose, an aforementioned welding lug on the connection sleeve be provided. By attaching the heating conductors, a detachment of the connection device from the electric hotplate can be avoided for a permanent and safe connection.

These and other features will become apparent from the claims and from the description and drawings, wherein the individual features in each case alone or more in the form of sub-combinations in one embodiment of the invention and in other areas be realized and advantageous and protectable Represent embodiments for which protection is claimed here. The subdivision of the application into individual sections as well as intermediate headings does not restrict the general validity of the statements made thereunder.

Brief description of the drawings

Fig. 1

eine Seitenansicht einer erfindungsgemäßen Elektrokochplatte mit einer Anschlussvorrichtung an ihrer Unterseite, die Steckanschlussfahnen aufweist;

Fig. 2

eine Vorderansicht auf die Anschlussvorrichtung gemäß Fig. 1,

Fig. 3

eine Schrägansicht der Anschlussvorrichtung und

Fig. 4

ein Blechteil, aus dem ein Anschluss herausgebogen wird.

Embodiments of the invention are shown schematically in the drawings and are explained in more detail below. In the drawings show:

Fig. 1

a side view of an electric hotplate according to the invention with a connection device on its underside, the Steckanschlussfahnen having;

Fig. 2

a front view of the connecting device according to Fig. 1 .

Fig. 3

an oblique view of the connection device and

Fig. 4

a sheet metal part from which a connection is bent out.

Detailed description of the embodiments

In Fig. 1 an electric hotplate 11 according to the invention is shown with a hotplate body 12 and a sheet metal cover 13 at the bottom. Through the sheet metal cover 13 is an insulating sleeve 16, in which a heating conductor 17 is led to the outside, which is connected in the electric hotplate 11 to corresponding heating coils, not shown. On the underside of the metal cover 13, a connecting device 19 according to the invention is arranged for electrical connection, the electrical connections 21 in an insulating housing 20 has.

From the Fig. 2 and 3 the structure of the connecting device 19 can be seen better. The insulating housing 20, which consists for example of ceramic, is integrally connected to the insulating sleeve 16 and has a correspondingly formed portion. The connecting device 19 is provided for four terminals 21 and has these. Each terminal 21 has a connection sleeve 22, which is arranged in a kind of chamber in the insulating housing 20. The connection sleeves 22 have an inner space 23, in which a not shown connecting cable can be inserted. For fixing clamping screws 31 are provided, as is well known. The terminals 21 are bent from a single piece of sheet metal and thus form the connecting sleeve 22, which encloses the inner space 23 on four sides. Down to a terminal 21 has a protruding mounting portion 25 which pierces a corresponding recess in the insulating housing 20 and at its end a rotatable tab 26 has to secure the terminal 21 in the insulating housing 20. This type of attachment is correspondingly in the EP 957 661 A represented, which is hereby incorporated by reference.

From one side of the terminal 21 is a welding lug 28 from over the surface of the electric hotplate and extends beyond the insulating sleeve 16. At the welding lug 28 of the heating element 17 is fixed, in particular welded. In the opposite direction protrudes from the connection sleeve 22 from a plug connection lug 29. Thus, an in Fig. 3 illustrated connection direction to the plug connection lug 29, for example with a corresponding plug connection sleeve, the same as an insertion direction of a connection cable, which in the connection sleeve 22 is guided and then clamped in it. In the connection sleeve on the far right, the plug connection lug 29 is shown in dashed lines, which should show that a connection is possible without them with only the connection sleeve 22 for insertion of a connection cable.

Thus, therefore, with an electric hotplate 11 according to the invention together with connecting device 19 according to the invention, a number of advantages are achieved simultaneously. Due to the integral formation of insulating sleeve 16 and insulating housing 20 insertion or attachment to the sheet metal cover 13 is facilitated, in which case first the heating conductor 17 is guided through the bore of the insulating sleeve 16. The fixed welding of the heating conductor 17 to the welding lug 28 fixes this fastening or locks it, so to speak.

In Fig. 4 the sheet metal plate is shown so to speak before bending, from which the terminal 21 is made. The bending lines are shown in dashed lines.

Characterized in that the terminals 21 are made of a single piece of sheet metal by bending, a simple and inexpensive production is possible. True, how would Fig. 2 can be seen, a closed only on three sides connecting sleeve 22 sufficient so that the in Fig. 2 shown left, vertical and then bent portion extending not essential, but is considered to be advantageous. All functional sections are then formed on this piece of sheet metal, ie fastening section 25 together with tab 26, welding lug 28 and plug connection lug 29. By providing both the connection sleeve 22 and the plug connection lug 29, an electrical connection with a connection cable can follow, which is only stripped off at its end or a conductive sleeve. Likewise, a connection can be made via plug, in particular via a group plug. For this purpose, in addition to the insulating 20 codes or the like. be provided as in the aforementioned EP 957 661 A are described.

In an alternative embodiment, the terminal 21 or at least the connecting sleeve 22 could also be made of a solid material, for example, the interior 23 could be drilled out. The other functional sections such as attachment portion 25, welding lug 28 and a possibly provided plug connection lug 29 could then be subsequently attached thereto, for example by welding, which of course would involve considerable effort.

A further advantage of the plug connection lugs 29 is that, in the case of a connection via individual connection cables, which are introduced into the connection sleeves 22, the plug connection lugs form, as it were, a type of guide or lateral stop. This serves both to facilitate insertion of a connecting cable into the connecting sleeve 22 and to prevent incorrect insertion into one of the adjacent connecting sleeves.

Alternative mounting options of a connection cable in the connection sleeve 22 are easy to imagine. Thus, a clamping screw 31 can also be replaced by another clamping or fastening. It is also possible to provide 29 plug-in sleeves instead of the plug-in lugs. These, like the other connection 21, can also be produced from a sheet metal or the same piece of sheet metal.

Claims (13)

Connecting device (19) for an electric hotplate (11) with an insulating housing (20) and a plurality of in the housing (20) arranged electrical terminals (21), wherein the terminals (21) connecting sleeves (22) for insertion of a connecting cable, characterized characterized in that the connection sleeves (22) are made of sheet metal and are bent so that they are closed on at least three sides. Connecting device according to claim 1, characterized in that the connection sleeves (22) are circumferentially closed or are closed on four sides. Connecting device according to the preamble of claim 1, wherein in particular the connecting sleeves (22) are made of sheet metal and are bent such that they are closed on at least three sides, characterized in that the connecting sleeves (22) have a protruding and out of the housing (20). protruding portion (28, 29) for an electrical connection. Connecting device according to claim 3, characterized in that the protruding portion is part of a plug connection, in particular a plug connection sleeve. Connecting device according to claim 3, characterized in that the protruding portion (28, 29) is formed as a flat and / or straight metal part, in particular as a welding lug (28) or plug connection lug (29) for a plug connection. Connecting device according to one of claims 3 to 5, characterized in that the connecting direction or the course of the connecting sleeve (22) and the protruding portion as a plug connection (29) are the same. Connecting device according to one of claims 3 to 6, characterized in that a connecting sleeve (22) is made of solid material. Connecting device according to one of the preceding claims, characterized in that both a welding lug (28) for welding a heating conductor (17) of the electric cooking plate (11) and a plug connection (29) depart from a connecting sleeve (22), preferably a welding lug (28). and plug-in connection (29) protrude in different or opposite directions. Connecting device according to one of the preceding claims, characterized in that an electrical connection (21) or a connecting sleeve (22) is integrally formed, preferably bent out of a single piece of metal sheet. Connecting device according to one of the preceding claims, characterized by a clamping device (31) for the connecting sleeve (22) for fastening an inserted electrical conductor or connecting cable, in particular a releasable clamping device, preferably with a screw (31) in a thread in the connecting sleeve (31). 22) is guided and engages in the connecting sleeve (22). Connecting device according to one of the preceding claims, characterized in that on the housing (20) a plurality of identical or identical terminals (21) are provided, in particular next to each other and / or at equal distances from each other. Electric hotplate (11) with a connection device (19) according to one of the preceding claims, characterized in that the connection device (19) on the underside of the electric hotplate (11), in particular on a cover (13) of the electric hotplate (11) made of sheet metal or the like. , is fixed, preferably with the housing (20) on the underside of the electric hotplate (11). Electric hotplate according to claim 12, characterized in that for fixing the attachment of the connecting device (19) to the electric hotplate (11) heating conductors (17) of the electric hotplate (11) are connected to the connecting device (19), preferably welded to a welding lance (28 ) according to claim 5, wherein in particular the attachment of the connecting device (19) to the electric hotplate (11) is insoluble.

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