DE2355492A1 - COUPLING PART FOR ELECTRICAL APPLIANCES, IN PARTICULAR COOKING PLATES - Google Patents

Description

EJSENFÜHK & SPEISER patent attorneys

DfL-INO. GÜNTHER EISENführer DIPL-INQ. DIETER K. SPEISER

B R EMEN -dr.Ria Nat. listen to tin grapevine US. SIGN: M 2ß3

Applicant / INH: MOLEX INCORPORATED 2355492

File number: Jieu registration

date: 2 »November 1973

MOLEX INCORPORATED, incorporated under the laws of the State of Delaware, 2222 Wellington Court, Lisle, Illinois 60532, V * St.A.

Coupling part for electrical devices, in particular hotplates. -

The invention is concerned with a coupling part for electrical devices, e.g. for the heating elements of electric cookers or the like.

Electric cookers of conventional design have heating elements that are used to clean the heating elements or their surroundings are pivotable or completely removable. Completely removable ones are preferred Heating units, as they allow better access and the easy replacement of damaged heating elements to back up. ·

So far, separable connectors for removable heating elements have been known. Because of in electrical Herd used high currents and relatively high chips as well as due to the individual deviations between

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see the different types of stove were such connecting parts however, expensive and complicated, many parts often required manual assembly and use of screw clamps, which are expensive and expensive Installation are

According to the invention, a one-piece injection molding Manufactured housing for a coupling or a connection part for electrical devices, e.g. for the heating elements of flocks, provided. A holder with individual Modifications of a basic shape consists of sheet metal and attaches the insulating body in one Hearth, regardless of differences between different types of cookers. Screw terminals are completely avoided through the use of pressure connections, which are produced by known crimping operations on the wire ends are attached and which are then introduced into longitudinal openings or exit holes in the insulating body where they are ready to receive the ends of the heating elements; the heating elements are plugged in simply in the terminals without using separate terminals at the ends of the heating element wires will. -

The invention is described in detail below with reference to the accompanying drawings. Show it:

Fig. 1 is a perspective view of a coupling part constructed according to the invention

in connection with a stove heating element, the latter being shown on a smaller scale;

Figure 2 is a perspective view of the plastic or insulating body of the coupling part;

Fig. 3 is a horizontal longitudinal section through the

Coupling part along the line 3-3 in Fig.l;

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Fig. 4 is a side view with partially broken away Share;

Fig. 5 is a part of a longitudinal section showing a

Modification of the holder shown in Fig. 4 represents and

FIG. 6 shows a representation similar to FIG. 5 with a further modified holder shape.

Fig. 1 shows a heating element 10 of known type with a metallic coil 12, from the ends of which at 14 inner ladder protrude. The ends are spaced apart by a suitable metal or other plate 16 held from each other. In the state shown, no terminals are attached to the ends 14 of the conductors, but the ends are essentially formed as hooks 18, each essentially in one vertical plane. Since the heating element 10 is known, possibly with the exception of the hook ends 18, no further explanation of this part seems necessary and this part is in a little smaller Scale shown.

The protruding ends 14 of the heating element conductors fit a coupling part constructed according to the invention. The coupling part 20 comprises a single piece injection molded insulating body 22 made of heat-resistant phenolic resin and is continuously rectangular in plan view. In the side view, the body has a relatively receding rear end section 24 and ^{f has} a thicker front section 26 with a sloping end wall 28. Two longitudinal openings or bores 30 arranged at a distance from one another, extend parallel to one another through the entire longitudinal extent of the body 22 and open in the inclined end wall 28 and in the cut back front 32. Pie bores have a continuously rectangular or square cross-section that is uniform

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except that each bore in the vicinity of the end wall of the housing along a portion 34 is widened laterally is, whereby the front shoulders 36 and the rear shoulders 38 are formed. The body 22 is completed by two flat, elongated projections 40 on both sides of the inclined end wall 28.

Two identical metallic connection sockets 42 can be inserted into the bores 30. These jacks are preferably made of resilient sheet brass. Since both sockets are identical, it is sufficient to only use one of to describe them. Each socket comprises a flat, horizontal base plate 44, which is a narrower front section 46 with side flanges 48 extending therefrom. Each side flange 48 is seated beyond the front edge 50 of the base plate and forms an arm 52, the two arms essentially converging at 54 contact each other and from then on diverging at 56 a V-shaped or dissolute Form entrance. As can be seen, the front ends 58 of the arms form outwardly projecting edges. Resilient noses 60 directed diagonally backwards are knocked out of the arms 52 and flanges 48

Behind the base plate 44 is each connection socket with a molded crimp part 62 for clamping one Head end 64 provided. Behind the crimped part 62 for the conductor core is a crimped part 66 for the conductor insulation provided, with which the insulating jacket can be clamped in such a way that mechanical stresses are eliminated and the insulation cannot migrate back on the conductor core. Pressing or squeezing techniques are known per se and do not need to be explained here. .

According to FIG. 3, the corresponding connection sockets 409822/0 758 slide

42 from the rear end into the bores 30, the outwardly spreading ends 56 turning slightly compressed when sliding through the rear section of the bore and expanding to the maximum in the enlarged section 34 of the bores and finally striking the front shoulders 36 with the ends 58. At the same time, the tabs 60 flexibly pivot a little about the passage through. the rear section of the bores 30 to allow, and springs outward until the back grips behind the rear shoulder tr η 3 8 _y . to prevent accidental retraction of the terminals. Of course, the sockets are printed on wires 64 prior to insertion. On the coupling part, after the connection sockets have been inserted into the insulating body, all electrically conductive parts are covered so that no second ones. Case is necessary to meet electrical safety requirements.

The area 54 in which the arms 52 contact one another has substantially flat side surfaces which engage the hard ends 18 of the heating element wires when the latter are inserted. In: Figure 3 the plate 16 is broken away so that one heating element end can be installed while the other is not installed so that the parts of the coupling part appear alone and when assembled. The essentially flat contact surfaces allow electrical connections. Contact in a relatively large area and avoid hot spots due to unwanted areas · high current density. Since the connection sockets are made of spring brass and through the ends 58 _; and are located by the lugs 60, the sockets have a bore in the bore. some degree of slidability so that the sockets can move slightly from side to side to accommodate heating element plugs with centers of 1.43 (9 / i6 »y or" 1.49 cnu'i 5/8 "Γ"

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to be able to accommodate , and so that each connection socket has a certain possibility of twisting in order to be able to accommodate the corresponding ends 18 of the heating elements. The pressure connection of the connection socket to the wires avoids the use of expensive screw terminals and the costs of their connection.

The coupling part according to the invention also includes a Sheet metal holder 68. This holder has an upper web 70 with two molded, downward-facing side walls or flanges 72 each having a rectangular opening 74 for receiving the respective projections 40 on the sides of the housing 22, thereby securing the housing in the holder. The side walls 72 are provided with forwardly extending arms 76 which bend slightly outward at 78, then at 80 converge and have tips 82 pointing outward. Resilient noses tucked inwards 84 are in engagement with the ends of the holder 16, essentially around the conductor ends 18 with the terminals 42, as shown in the lower portion of FIG. 3.

The front end of the bracket web 70 is provided with an upwardly facing flange 86 which has a hole for receiving a screw for securing the bracket to a suitable location on the cooker. The fold between the flange 86 and the web 70 is embossed or reinforced in some other way. In the vicinity of the rear end of the web protrudes a nose 92 which is intended for engagement with a further fastening part in the hearth. The nose 92 is shown at about a 45 ° angle, but it may be even more pronounced and upright almost to a right angle or pointed to a small point. Be inclined,

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speaking the requirements of a particular cooker.

A modified form of the holder is partially shown in Fig.5 shown, wherein the same parts are provided with the same reference numerals. The main difference is daring that the wall 86a is not upright, but at 94. is inclined backwards by 90 ° and a horizontal one Has section that is used in appropriately designed stove types.

Fig. 6 shows a further modified form of the holder, the parts of which almost coincide with the parts shown in FIG. 5, the subscript b for differentiation serves. The difference in this example is that the forward-facing section of the web with an upward sloping step 96 is provided, which in turn is intended for use with a specific Hearth type is used.

An optional feature on the holder is shown in FIG and includes two longitudinal ribs 98 extending from the main portion of the web 70 extend into the front section in order to stiffen the front section with respect to the main part of the web. These ribs can be provided or omitted to provide either a rigid seat or a to create resilient fit of the body of the coupling part and thereby a greater or lesser mismatch to allow between the heating unit and the coupling part. This way are with or without ribs and mi-thin three variations of the holding structure six different variants possible in the front section of the holder,

As stated above, the body of the coupling part is injection molded from heat-resistant phenolic resin.

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Tigt, and all electrically conductive parts are covered after pressing the connection sockets on the wire and after inserting the connection sockets, so that no second sheath is required. The connection sockets made of heat-resistant spring brass are pressed onto the wires so that additional screw terminals are not necessary. Since ^{the pressure area 1} has a fairly small cross-section and the connection between the connection sockets and the ends 18 of the heating elements is obviously only made via the side surfaces, it is immaterial whether the connection sockets are inserted with the correct side up or vice versa, in other words , There are two correct positions that differ by 180, and the assembly can thus be carried out flexibly. The spring property of the connection sockets and thus the possible slight yielding from side to side ensures the acceptance of heating element pins with cement spacings of 1.43 cm or 1.59 cm (9/16 inch or 5/8 inch); both dimensions are industry standard. In addition to centering the metal plate 16, the holder also fulfills the task of creating a ground connection from the fastening of the holder on the stove to this metal plate and thus to the outer surfaces of the heating element.

The sloping or diagonal end wall of the insulating body of the coupling part allows pivoting the heating element for cleaning and allows its removal without spatial movement of the whole Heating element is required in the longitudinal direction away from the coupling part.

Overall, a coupling part for electrical devices has been disclosed that is easy and with little Cost to build and assemble is. The ones shown here

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and are illustrated embodiments of the invention
to be understood only as examples. Numerous will be apparent to those skilled in the art but fall within the scope of the invention
Changes accessible.

In summary, a coupling part for electrical devices, for example for stoves, with an insulating body made of heat-resistant phenolic resin and injection-molded from one piece was described. Spring connection terminals, which are already pressed onto lead wires, are inserted into openings in the body. The end wall of the insulating body has openings for receiving the lines of a
Heating element. A sheet metal holder fixes the insulating body in the correct position in a stove.

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Claims (4)

Expectations 1. coupling part for electrical devices with a one-piece insulating body, the two with Has bores arranged at a distance from one another and extending in the longitudinal direction through the body, characterized by a front and a rear stop (36, 38) in each bore (30), by two identical connection sockets (42) made of sheet metal, one of which is inserted in each bore, each Connection socket comprises a wide base plate (44) with arms (52) which are perpendicular to the base plate extend converging to the front up to a contact area (54) and further diverging ends (58) to abut against form the front stop, each connection socket also one to the rear pointing nose (60) to rest against the rear stop and a rear section (62,66) for the Connection to a lead wire (64) comprises. 2. Coupling part according to claim 1, characterized in that the insulating body (22) has a beveled end face (28). . ■ 3. Coupling part according to one of the preceding claims, characterized in that each connection socket on one leading from the coupling part to the rear and covered at its conductive points by the coupling part (20) Wire (64) is pressed. 409822/0758 4. Coupling part according to one of the preceding claims, characterized by a sheet metal holder (68) which the insulating body includes and holds and with fastening devices (86,88,92) for attachment to a electrical device is equipped. 409822/0758 Blank page