JP2648078B2 - Modular appliance plug - Google Patents

Abstract

In conjunction with an electrical apparatus plug, which consists of an insulating plastic housing with spring chambers (which are open to the exterior) for in each case one contact element, and the insulating plastic housing consisting of a head part (which has the spring chambers) and of an injection-moulded plug part (which insulates the contact points between the contact springs and the supply line and partially engages over the head part), and a holder is provided which is partially inserted into the head part before the plug part is injection-moulded, it is proposed to injection mould the integral contact elements (which consist of the contact springs (64) and the connecting sockets (60)) into the holder (6). This results in an apparatus plug in the case of which the contact elements are fixed firmly in the holder during the step-by-step production. <IMAGE>

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric device plug comprising a head member provided with a plurality of spring chambers each having an outwardly open insulating-synthetic resin casing and a plug portion, wherein the spring chamber has A contact element is inserted in each case, this contact element being connected on the one hand to the feed line as a molded connection bush and, on the other hand, a complementary mating plug of the appliance to be connected as a molded contact spring. The head member is provided with a partially inserted retaining member, which supports, on the one hand, a contact spring inserted in the spring chamber, In this case, the contact bushing protrudes on the opposite side of the holding member, and the plug part is injection-molded so as to insulate the contact point between the contact spring and the power supply line and to partially cover the head member, especially It relates to an electrical appliance plug which serves as a connecting bush for the pole of the power supply line of the appliance plug.

[0002]

2. Description of the Related Art Such plugs are known (cf. DE 38 07 717). This plug serves to connect the appliance to the AC socket and thus to the energy supply of the power plant. A suitable connecting cable, i.e. a consumer wire, is connected to the AC socket via a contact plug and to the appliance via an appliance plug of this kind.

[0003] This appliance plug is now fully automated and manufactured. At that time, the power supply line, that is, the conductor of the connection cable, is inserted into the contact spring and is fixedly connected at the crushing / caulking joint. Since the contact springs are inserted one by one into complementary openings in the holding plate or holding member, a pre-assembled unit results. The unit is mounted on or coupled to an inelastic molded member to form a plug body. The plug body is injection-molded and coated with a synthetic resin so as to partially overlap to form a plug head that can be manually handled and operated, that is, a plug head that can be inserted into and pulled out of the AC socket.

When the plug body is injection-molded and covered, a loosely inserted contact spring slides when the synthetic resin material collides. Furthermore, due to the loosely inserted contact springs, there is a risk that the plug body will be detached again under undesired conditions when the appliance plug is withdrawn from the socket. Moreover, there is a danger when the synthetic resin coating does not guarantee the required bonding strength due to insufficient manufacturing technology.

From the point of view of automatic fabrication, it has been found that this known "insertion technique" of contact springs is not without problems. This is because in the course of the injection molding coating after the insertion of the contact spring, the contact spring may be lost in some cases and this loss is not noticed. This, of course, becomes a plug for the wound.

[0006]

An object underlying the present invention is to eliminate the above-mentioned problems.

[0007]

The object is achieved in that the holding element surrounds the respective integral contact element consisting of the contact spring and the connecting bush by injection molding. Thereby, the contact spring is correctly and completely integrated into the plug. Other embodiments are the subject of the dependent claims.

According to a preferred embodiment of the electric appliance plug according to the present invention, another holding member is attached to the holding member, and the power supply line is formed in order to reliably prevent the individual wires from bending or projecting sideways. An insertion funnel for the conductor is formed above the molding.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an electric appliance plug according to the present invention. The electric appliance plug 1 of FIG. 1 is composed of an insulating casing composed of two members in principle. That is, it is constituted by an inelastic molded part 2 itself composed of two or three members, and an elastic plug part 3 partly overlapped and injection molded. This plug portion is indicated by a shadow line in the figure. The appliance plug 1 has an inelastic molded part 2 which is inserted into a mating device of the appliance to be connected. The plug part 3 is a feeder 4 having two cores.
And the other end of the feed line is connected to a contact plug insertable into an AC socket.

The inelastic molded part 2 is constituted by a head member 5 (see FIG. 2) outlined by a dotted line and a holding member 6 (see FIG. 3) outlined by a broken line. The head simply serves as a grip for manipulating the appliance plug. The elastic plug part 3 is injection molded on the holding member. The head member 5 and the holding member 6
Circumferentially extending bulge 7 injection molded on holding member 6
Has a step.

As can be seen from the dotted line of the head member 5 and the dashed line of the holding member 6, the head member 5 and the holding member 6 penetrate each other and form one main part. In this case, the two parts are matched in shape and dimension to one another, so that a form-complementary and friction-locking assembly unit is formed. This pre-assembled unit is, as already mentioned, injection-moulded around the plug part 3, so that an appliance plug 1 capable of performing its function is formed. Of course, the conductor end of the feeder line 4 from which the insulating material has been removed is inserted in advance and connected by a crush / crimp joint.

In order to facilitate the insertion of the conductor end of the power supply line 4 into the corresponding connection bush 60 of the holding member 6 and when the individual wires of the group conductor bent or bent at the time of insertion protrude to the side during handling operation. In order to avoid creating a potentially life-threatening danger in some embodiments of the above-described appliance plug 1 according to the invention, the holding element 6 is provided with (another) molding element 9. This molded member 9
Is provided with a so-called insertion funnel 90 for each connection bush 60 of the holding member 6. This insertion funnel ensures a reliable insertion of the bunching conductor into the connecting bush 60 of the holding member 6.
The molding member 9, the holding member 6 and the head member 5 are assembled in a modular manner, and a synthetic resin is injection-molded around the plug portion 3 as shown. The end product shown in FIG. 1 is a particularly bipolar appliance plug 1 which is very small, electrically safe and mechanically strong, ie resistant to tension and torsion.

Next, the electric appliance plug 1 of FIG. 1 will be described in detail based on individual components. FIG. 2 shows the head member 5 of an inelastic molded part (2 in FIG. 1). The basic shape is a flat rectangular parallelepiped 50 having gripping concave portions 52 on both side surfaces 51. On one end face of the rectangular parallelepiped 50, a circumferential collar 53 having an outer contour with a step is provided. This collar has a number of notches 54 distributed around the circumference.
It has. The notch 56 adjacent to the step 55 reaches a considerable portion of the width of the rectangular parallelepiped (to accommodate the locking projection of the holding member; see FIGS. 1 and 3). When viewed in the longitudinal direction of the rectangular parallelepiped 50, the rectangular parallelepiped has two holes 57 whose central axes are parallel.
It has. This hole transitions to a hole 58 having a smaller diameter when viewed from the second end face.

FIG. 3 shows a holding member 6 of an inelastic molded part (2 in FIG. 1) as a mounting member or an attachment for the head member 5 in FIG. The holding member 6 is made of an inelastic synthetic resin molded member 61.
The cross section of this molded member is the circumferential collar 53 of the head member 5.
The molded part has a circumferential bulge 7 which coincides with the free space formed by. The bulge 7 rests on the collar 53 of the head member 5 in the assembled state. The molding member 61 is inserted into the free space of the collar 53 of the head member 5 in an assembled state. The molding member 61 has a notch 62 in a lateral direction. This notch is provided with the above-mentioned locking projection 63 on the side opposite to the bulging portion 7. The retaining member 6 as an important assembly or functional element of the appliance plug 1 is provided with two connecting bushes 60 as described with reference to FIG. The connecting bush is oriented parallel to the central axis and is injection-molded so as to be firmly and stably fixed in the molding member 61. The connection bush 60 protrudes on the side of the molding member 61 defined by the bulge 7. On the second side of the molding member 61,
A contact spring 64 integrally connected to the connection bush 60 protrudes. This contact spring is inserted into the hole 57 of the head member 5 when the inelastic molded part 2 of the electric appliance plug 1 is assembled. The length of the contact spring is such that the contact spring has a stepped hole 5.
It is set to reach near the step of 8. As can be seen from the side view of FIG. 2, the electrical contact element consisting of the contact spring 64 and the connecting bush 60 has a flat area 67 in the central area 67 when viewed in the axial direction. As shown in the bottom view, small tubular connection bushes 60 or contact springs 64 are formed on both sides of the formed member 61 in this flat element. The contact spring 64 has a funnel (not shown), which may be conically widened, on its end face.

In the special shape of the holding member 6, the bulge 7
On the side of the molding member 61 adjacent to the
In the center between zeros, a separating web 65 is formed. This separating web serves for additional electrical safety between the connecting bushes 60. The separating web 65 is provided at its free end face with a receiving pin 66 (for a molding member 9 described below with an insertion funnel 90).

Basically, all the units assembled by the conductor ends of the power supply line 4 pre-assembled and inserted and fixed by the head member 5 and the holding member 6 are supplemented in the injection molding process around the plug portion 3. A complete and finished appliance plug 1 results. At this time, the holding member 6 is inserted into the head member 5 as shown by the arrow X direction between FIGS. 2 and 3, and in the range of a complementary locking portion between the locking projection 63 and the notch 56. They are connected in a shape-complementary and friction-retaining manner. During the injection molding process, since the synthetic resin material enters into the free space from between the notches 54 or 62, the head member 5 and the holding member 6 are tightly connected and entangled tightly.

FIG. 4 shows another molded member 9. This molded member is important from the viewpoint of electrical safety of the electric appliance plug 1. The problem of this molded member 9 is that the power supply line (FIG. 1)
4) the connecting bush 60 of the holding member 6
In order to prevent the individual wires from being bent when the wire is inserted into the cable, when the individual wires are actually bent, the wire is grasped and surrounded. The molded member 9 is a holding member 6
Has a basic shape portion 91 corresponding to the cross-section of FIG. In this basic shape portion, one accommodation small tube 92 is injection-molded coaxially with the connection bush 60 of the holding member 6. The molded member 90 can be placed on the holding member 6 via the small storage tube 92. In the area of the basic shape portion 91 and on the extension of the small storage tube 92, the internal hole of the small storage tube 92 transitions to a conical insertion funnel portion 90. This provides an insertion aid for the conductor of the feeder line from the free end face of the molding 9. In order to simplify the assembly, between the insertion funnel 90 a receiving pin 66 of the separating web 65 and a complementary notch 93 are provided. The molding member 9 is connected to the holding member 6 via the accommodation pin. The assembly direction is indicated by the arrow Y direction between FIGS.

The components of the appliance plug described with reference to FIGS. 2, 3 and 4 are assembled. The portion formed by the holding member 6 and the molding member 9 is connected to the power supply line 4. The unit thus formed or assembled is finally injection molded and coated. The result is a plug part 1 on the one hand and a complete plug 1 on the other hand.

[0019]

As described above, in the electric appliance plug according to the present invention, since the holding member surrounds the periphery of each integral contact element composed of the contact spring and the connection bush by injection molding, the contact spring is correctly and correctly formed. It has the advantage of being completely integrated into the plug and is a very small, electrically safe and mechanically strong, i.e. particularly a two-pole appliance plug which is resistant to tension and torsion.

[Brief description of the drawings]

FIG. 1 is a diagram showing a completed bipolar electrical appliance plug.

FIG. 2 is a view of the head member of the inelastic molded part of the electric appliance plug of FIG. 1 as viewed from three directions.

FIG. 3 is a view of the holding member complementary to the head member of the electric appliance plug of FIG. 1 when viewed from two directions.

FIG. 4 shows the molded part with the insertion funnel for the appliance plug of FIG. 1 in two directions.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric appliance plug 2 Molding part 3 Plug part 4 Power supply line 5 Head member 6 Holding member 9 Molding part 56 Notch 60 Connection bush 63 Locking projection 64 Contact spring 65 Separation web 66 Housing pin 90 Inserting funnel part 93 Notch

Claims (7)

(57) [Claims] 1. An electric device plug comprising a head member provided with a plurality of spring chambers having an insulating-synthetic resin casing opened outward and a plug portion, wherein each of the head chambers has one spring chamber. The contact element is inserted, which on the one hand is connected to the feed line as a molded connecting bush, and on the other hand, as a molded contact spring, the plug pin of a complementary mating plug of the appliance to be connected is inserted. The head element is provided with a retaining element, which is partially insertable, the retaining element supporting, on the one hand, a contact spring inserted in a spring chamber, and, on the other hand, a retaining element. The plug part is insulated from the contact spring between the contact spring and the power supply line, and is injection-molded so as to partially cover the head, In an electric appliance plug serving as a connection bush for a power supply line of a pneumatic appliance plug, a holding member (6) includes a contact spring (64) and a connection bush (6).
0) The electrical device plug characterized in that it surrounds the respective integral contact elements of 0) by injection molding. 2. The appliance plug according to claim 1, wherein notches (62, 64) are provided in the overlap region between the holding member (6) and the head member (5). 3. The holding member (6) has at least one locking projection (63), and the head member (5) has a complementary locking groove (notch 56). Or 2 appliance plugs. 4. The appliance as claimed in claim 1, wherein the contact spring has a conical expansion at its end which is accessible from the outside for the mating insert. plug. 5. The holding element (6) is provided with a separating web (65) between the projecting ends of the contact elements serving as connection bushes (60) for the feeder (4). An electrical appliance plug according to any one of claims 1 to 4, characterized in that: 6. A molding member (9) is mounted on the holding member (6) from the side opposite to the head member (5), the molding member comprising two small tubes (90) covering the connection bush (60), 2. The method as claimed in claim 1, wherein the openings on the opposite end of the molding are conically enlarged in order to form an insertion funnel for the bunching conductor of the feeder line. Any one appliance plug up to 5. 7. The separating web (65) includes a receiving pin (66).
7. The molding member (9) is provided with complementary notches (93), and the holding member (6) and the molding material (9) are formed complementary to each other. Appliance plug.