EP2787578B1 - Door drive with an electrical arrangement - Google Patents

Description

The present invention relates to an electrical arrangement which is suitable for forwarding electrical signals in a door drive and / or a door closer.

In the prior art, cables are mostly used to distribute electrical signals and / or voltages or powers in door drives and / or door closers, with which individual contacts at remote ends of the housing of the door drive are electrically connected. These electrical cables must be routed past the other components of the housing (e.g. gearbox, power supply unit, control circuit boards, motor and carrier body for the aforementioned elements), which on the one hand increases the manufacturing effort and on the other hand increases the risk of damage. In addition, appropriate installation space must be reserved in the housing, which means that the housing must have a higher volume and therefore higher material costs are necessary. In addition, from an aesthetic point of view, there is an endeavor to design door drives and door controls with small volumes. Pre-assembled cable harnesses are used, but cannot comprehensively and satisfactorily reduce the main disadvantages of the prior art.

From the DE 10 2006 028 815 B3 an electrical arrangement is known which comprises an injection molded part and a metallic stamped part, the stamped part being positively connected to the injection molded part and end regions of the stamped part protruding from the molded part for the purpose of electrical contacting.

It is therefore an object to simplify or improve the electrical connections within a door drive and / or a door closer.

The aforementioned object is achieved by a door drive with the features according to claim 1.

An electrical arrangement has an injection-molded part made of plastic, which can serve as a support body for elements inside the door drive, but on the other hand can also combine parts of the housing. For example, a lower part of the housing can contain such a carrier body, an upper part of the housing being placed as a cover on the lower part of the housing or the carrier body. In addition, the electrical arrangement has metal stamped parts which are positively connected to the injection molded part. The metallic stamped parts can consist of an electrically conductive material such as sheet metal and have already been integrated into the plastic in the course of an injection molding process for the production of the injection molded part. On the one hand, this protects the stamped parts from corrosion and mechanical damage; on the other hand, embedding the stamped part in the injection-molded part electrically isolates the stamped part from its surroundings. In addition, a stamped part can also increase the strength of the entire arrangement. For the purpose of electrical contact, predefined areas of the stamped part can protrude from the injection-molded part. This is preferably ensured during the injection molding process in that the areas of the stamped part which are used for electrical contacting are arranged outside the volume to be filled with plastic.

A method for producing an electrical arrangement for a door drive is described. According to this, an injection molded part made of plastic is produced, which can serve as a housing part and / or support body in an electric door drive. On its surface, the injection-molded part has depressions which are designed to receive a metal stamped part. Compared to the surface of the injection-molded part, the depressions are only a few millimeters deep, so that a sheet metal can be inserted into the depressions as a metal stamped part. The metal part can be attached, for example, by gluing or clamping
or reshaping of the injection molded part. As an alternative or in addition, a second injection molding process can now also be carried out with the integrated metal stamped part.

Preferably, domes are provided in the depressions which correspond to openings in the metallic stamped part in such a way that after the metallic stamped part has been inserted into the depressions of the injection molded part, the domes penetrate the metallic stamped part and the stamped part can be positively connected to the injection molded part by hot stamping . According to an alternative embodiment, domes flank the depressions and encompass the stamped part in the course of hot stamping.

An alternative method for producing an electrical arrangement is described in which a metal stamped part is inserted into an injection mold. The injection mold is then closed and plastic compound is injected. Here, the injected plastic encloses the punched part except for those areas of the punched part which are arranged outside the injection volume or the injection mold for the purpose of electrical contacting.

Preferably, the above-mentioned method can be developed by using predefined connecting webs between areas of the stamped part, for. B. can still be severed within the injection mold. For example, after the injection mold has been closed, the punched part being fixed by closing the injection mold, a punching process can sever the connecting webs and thus electrically isolate the predefined areas of the punched part from one another. Then plastic is injected, whereby the predefined areas of the stamped part are permanently electrically isolated from one another and their mechanical position is fixed to one another.

In the following, advantageous configurations of individual features of the electrical arrangement are discussed, which, however, also apply to corresponding configurations of the method without this being mentioned in detail.

The injection-molded plastic part can advantageously combine as many functions as possible, which reduces the cost of manufacture and assembly. It is therefore proposed to design the plastic injection-molded part as at least part of the housing for a door drive or a door closer. Elements or assemblies of the door drive, such as motor, gear, power supply units, fastening elements and control circuit boards, can also be provided in it, such as snap / latching elements with which a cover or a second housing part can be held on the injection molded part. The production as a plastic injection molded part enables an inexpensive and mechanically highly resilient production with a comparatively low weight of the overall arrangement. Further preferably, the plastic injection-molded part can be a sound-decoupling mounting plate for a door drive. Particularly with a suitable choice of plastic, the plastic can spread out in the injection-molded part Vibrations are only propagated to a reduced extent on, for example, a door leaf or a wall to which the door drive is attached. In the context of the present invention, the mounting plate is to be understood as the part with which the electrical arrangement is fixed in its surroundings.

The stamped part can also advantageously have openings for positioning within the injection mold, which can correspond to positioning aids within an injection mold. In this way, the stamped part can be arranged in a predefined position within an injection mold and fixed in this position during the injection molding.

The stamped part can also advantageously have connection elements for making electrical contacts in those areas which are not surrounded by the injection-molded part, or it can be set up for attaching corresponding connection elements. For example, the contact areas can be designed as insulation displacement contacts and / or plug contacts and / or soldering lugs. In this way, the effort for additional parts, with which electrical contacts are usually made, is reduced, and the design can be designed to save space.

According to the invention, the plastic injection-molded part is designed as a housing for a drive, which therefore does not have to have a completely separate housing or no housing at all. For example, the stator, rotor and shaft of an electric drive could be inserted directly into corresponding recesses in the plastic injection-molded part and, if necessary, fixed by a cover. The injection-molded plastic part can thus be used as an assembly carrier. Likewise, the plastic injection-molded part according to the present invention can dispense with mechanical (housing) components of a power supply unit.

The electrical arrangement can also advantageously have an integrated plug connection for plugs and / or cards with electrical conductor tracks for controlling the components of a door drive. If necessary, snap / latching elements can be integrated into the plastic injection-molded part or into a cover provided for this in order to fasten these or other elements.

According to the invention, the plastic injection-molded part is set up to receive a cover which has stamp elements. These stamp elements can interact with cavities in the plastic injection-molded part, for example, in such a way that electrical elements inserted in the plastic part, such as connection lines, are pressed into the insulation displacement contacts of the punched part provided in the plastic injection-molding part to produce an insulation-displacement connection. In other words, closing the plastic injection-molded part by means of a cover set up as described above also closes an insulation displacement connection, by means of which electrical elements inserted into the plastic injection-molded part are connected to the punched part.

Figur 1

ein Stanzteil zur Verwendung in einer erfindungsgemäßen elektrischen Anordnung;

Figur 2

ein Ausführungsbeispiel einer elektrischen Anordnung gemäß der vorliegenden Erfindung;

Figur 2a

eine Detailansicht eines Ausführungsbeispiels einer erfindungsgemäßen elektrischen Anordnung mit einem Schalter;

Figur 3

eine Detailansicht einer Steckverbindung zwischen einer elektrischen Anordnung gemäß der vorliegenden Erfindung und einer Leiterkarte;

Figur 3a

die in Figur 3 gezeigte Anordnung in einer gesteckten Position;

Figur 4

eine geschnittene Darstellung einer Schneid-/ Klemmverbindung in einer geschlossenen Ansicht eines Ausführungsbeispiels der erfindungsgemäßen elektrischen Anordnung;

Figur 5

Ausführungsbeispiele für Anordnungen und Ausführungen von Schneidklemmen, wie sie innerhalb von erfindungsgemäßen elektrischen Anordnungen Verwendung finden können;

Figur 6

eine alternative Ausführungsform einer erfindungsgemäßen elektrischen Anordnung;

Figur 7

Detailansichten von Ausführungsbeispielen für Stanzteile; und

Figur 8

ein alternatives Ausführungsbeispiel einer erfindungsgemäßen elektrischen Anordnung.

The features and aspects of the present invention discussed above are described in more detail below with reference to the accompanying drawings. Show:

Figure 1

a stamped part for use in an electrical assembly according to the invention;

Figure 2

an embodiment of an electrical arrangement according to the present invention;

Figure 2a

a detailed view of an embodiment of an electrical arrangement according to the invention with a switch;

Figure 3

a detailed view of a plug connection between an electrical arrangement according to the present invention and a printed circuit board;

Figure 3a

in the Figure 3 Arrangement shown in a mated position;

Figure 4

a sectional view of an insulation displacement connection in a closed view of an embodiment of the electrical arrangement according to the invention;

Figure 5

Embodiments of arrangements and designs of insulation displacement terminals as they can be used within electrical arrangements according to the invention;

Figure 6

an alternative embodiment of an electrical arrangement according to the invention;

Figure 7

Detailed views of exemplary embodiments for stamped parts; and

Figure 8

an alternative embodiment of an electrical arrangement according to the invention.

Figure 1 shows a stamped part 3 as it could be provided in an electrical arrangement 1 according to the present invention. The basic material of the stamped part 3 consists of a metal sheet which has elongated recesses through which conductor tracks 16 are formed. The electrical conductor tracks 16 are connected by stabilizing connecting webs 9. These are set up to be cut through only after the punched part 3 has been encapsulated and thus to electrically isolate the conductor tracks 16 from one another as required. Furthermore, centering receiving holes 15 are provided, which can be provided for positioning the stamped part 3 within an injection mold, but alternatively or additionally can also be used as openings 10 for connection to the injection molded part 2 by means of domes. In particular, the end areas of the stamped part 3 shown are angled with respect to the main plane of the stamped part 3 in order to be able to make space-saving electrical contacting of the end areas. For this purpose, insulation displacement contacts 6 are provided for connecting cables as well as plug contacts 14 for contacting a circuit card with contact points (not shown) and also plug contacts 17 for contacting by a program switch or a program button. A possible use or a possible installation of the illustrated stamped and bent part is explained below.

Figure 2 shows an electrical arrangement 1 according to the present invention, in which a stamped part 3 is essentially integrated in an injection molded part 2 as a housing for a door drive. In a front area, plug contacts 14 of the stamped part 3 protrude from the injection molded part 2, which are connected to Figure 3 is received. In a head area of the injection molded part 2, an arrangement for integrating a program switch 18 is shown, which in FIG Figure 2a is described. The interaction of the cover 12 with the insulation displacement contacts 6 is in connection with Figure 4 described. On the underside of the injection molded part 2, a recess is provided as a recess 19, which can be used on the one hand as a cable outlet, on the other hand as a recess for a shaft of a drive.

Figure 2a shows a detailed view "X" of a header area of the in Figure 2 illustrated embodiment of an electrical arrangement 1 according to the invention in sectional view. The program selector switch 18 is inserted into the injection molded part 2 in which it is fixed by means of two snap / latching elements 11. The program selector switch 18 has three electrical contacts which are electrically connected to the plug contacts 17 of the conductor tracks 16 of the stamped part 3. For this purpose, the plug contacts 17 are so exposed in the electrical arrangement 1 that they can be connected to the electrical connections of the program selector switch 18 through a certain elasticity to produce permanent electrical contact.

Figure 3 shows a detailed view "Y" of a plug connection as it is by means of the in Figure 2 plug contacts 14 shown and a circuit card 21 can be produced. For this purpose, the plug contacts 14 have recesses which are open on one side and which correspond to contact points 22 of the printed circuit card 21. In this case, plug strips 20 for connection to cables can be provided on the printed circuit card 21, via which a further electrical connection of the electrical arrangement 1 can be established. The contact points 22 on the printed circuit card 21 can essentially be represented as exposed contact areas, for example by exposed conductor tracks on a circuit board.

Figure 3a shows the in the Figure 3 The arrangement shown in the plugged-in position. In this partially sectioned side view it becomes clear how the circuit cards 21 are inserted into the recesses in the plug contacts 14, the contact points 22 between an electrical contact the circuit board 21 and the plug contact 14. In the upper region of the recesses in the plug contact 14, the flanks of the recess are slightly beveled, so that a funnel-shaped contour is created, which makes it easier for the circuit board 21 to be threaded into the recesses of the contact points 22.

Figure 4 shows a partially sectioned illustration of an electrical arrangement 1 on which a cover 12 has been placed. The cover 12 has stamp elements 13a and 13b which correspond to different areas within the injection molded part 2 and stamped part 3 elements. The stamp element 13b has a first thickness with which the stamp 13b fills a recess 4 arranged in the injection molded part 2 over its full width. The stamp element 13b is concave in its head area, so that it corresponds to the insulation of a control cable 23 and presses it into the recess 4. In the recess 4, an insulation displacement contact 6 of the stamped part is provided, which has a recess with a width which is smaller than the width of the recess 4 in the injection molded part 2. Essentially, the width of the recess in the insulation displacement contact 6 corresponds to the core (e.g. a strand) of the control cable 23. The punch element 13a is designed with a smaller thickness than the punch element 13b, so that it corresponds to the recess in the insulation displacement contact 6 and the bare core of the control cable 23, which, for example, in a previous work step has been stripped, pushes into the recess in insulation displacement contact 6 to the bottom. In this way, the cover 12 of the arrangement shown has a large number of functions. On the one hand, it ensures a secure closure of the injection-molded part 2; on the other hand, it positions the control cables 23 and also establishes the electrical contact between the control cables 23 and the insulation displacement contacts 6.

Figure 5 shows exemplary embodiments for insulation displacement terminals as they could be used for insulation displacement contacts 6. The illustrated embodiments consist essentially of sheet metal parts, one end of which is bent perpendicular to the main plane of the part. The position of the folding lines of the insulation displacement terminals 6b is not aligned here, but a middle insulation displacement terminal protrudes opposite the outer ones perpendicular to the edging direction. Thus, the position of the contact points of an electrical connection produced by the arrangement shown will also be at different points. This can be advantageous, for example, if the ground, phase and neutral conductor of an AC connection are to be contacted by an insulation displacement connector each. In addition, the illustrated arrangement of the insulation displacement contacts 6 is spatially coded via their relative positions to one another with regard to a non-rotatable contact by means of a predetermined, corresponding socket in order to avoid contact errors. As an alternative embodiment, an insulation displacement terminal 6a is shown, with which, for example, the in Figure 4 The arrangement shown could be realized. In contrast to the in Figure 4 insulation displacement contacts 6 shown, the recess in insulation displacement terminal 6a is rounded in its upper area.

Figure 6 shows an alternative embodiment of an electrical arrangement 1. It can be seen that the conductor tracks 16 of the stamped part 3 are not completely enclosed by the plastic of the injection-molded part 2, but rather are inserted into depressions 4 on its surface. To connect the conductor tracks 16 to the injection-molded part 2, the latter has domes 8, which are each guided through an opening 10 in a conductor track 16. Such an arrangement makes it possible to connect a stamped part to an injection-molded part 2 by hot stamping the dome 8. The injection molding process for manufacturing of the injection molded part 2 is simplified here, while a subsequent work step (hot stamping) is required. In the present example, clamping contacts 7 are arranged in a balcony-like recess in the injection-molded part 2 in such a way that their beveled end rests closely against the surface of the injection-molded part 2. A part of the beveled end is raised or angled laterally with respect to the surface of the injection molded part 2, so that a clamping connection can be easily established in that an electrical contact can be pushed between the beveled end of the stamped part 3 and the surface of the injection molded part 2.

Figure 7a shows a detailed view of a stamped part 3 before this is reworked in a further work step into two conductor tracks 16 separated from one another in that a connecting web 9 is severed. Both conductor tracks 16 have an opening 10 for the purpose of hot stamping.

Figure 7b shows that in Figure 7a shown punched part 3, in which the connecting web 9 has been punched out. It can also be seen here that the injection-molded part 2 designed as a system carrier has been at least partially penetrated, so that the (former) connecting web 9 has been punched into the plastic of the injection-molded part 2 or through it. Due to the punching process for cutting through the connecting web or punching out the connecting web, the in Figure 7b illustrated conductor tracks 16 from each other electrically or galvanically isolated.

Figure 8 shows an alternative embodiment of an electrical arrangement 1. Compared to the exemplary embodiments discussed above, the injection-molded part 2 is made comparatively thin, so that the stamped part 3 both on its upper side and is only covered by a thin layer of plastic on its underside. Figure 8 shows an exemplary embodiment for a so-called “pre-molded part” 25, in which free punched recesses 24 are arranged in the areas of the connecting webs 9 of an inner punched part 3. The connecting webs 9 can be removed via these free punching recesses 24 without damaging a solid injection-molded part. In addition, the risk of punched-out connecting webs 9 remaining in the component and continually or later re-establishing an electrical contact between two conductor tracks 16 is reduced. Thus, a modification according to the invention of a manufacturing method for an electrical arrangement 1 can consist in that a stamped part 3 is encapsulated with plastic, free stamping recesses 24 being provided in the injection molded part 2 at predefined positions, then the connecting webs 9 arranged in the area of the free stamping recesses 24 removed by a stamping process the part produced is re-introduced into an injection mold and then overmolded in a second operation. To position the pre-molded part 25 in an injection mold for the second work step, centering holes for positioning the pre-molded part can also be provided in the injection-molded part 2 of the pre-molded part 25.

The core idea of the present application is to create an electrical arrangement with which a simple contacting of electrical connections can be made within a door drive or a door closer by surrounding metallic conductor tracks based on sheet metal by a plastic injection molded part, and ends of the sheet metal part by punching and / or bending processes for electrical contacting are prepared. Before or after the injection molding process, areas of the stamped part can be separated from one another in order to electrically isolate them from one another. The composite according to the invention is an electrical one Arrangement in which, on the one hand, the electrical contacts can be produced in an orderly and highly automated manner and also mechanically stabilize the composite, and on the other hand, a space-saving arrangement is created in which elements of add-on parts can already be manufactured or shaped in an integrated manner.

While the illustrated drawing figures show specific examples of embodiments of the present invention and these have been discussed in detail above, the scope of the present invention is limited solely by the features of the appended claims.

List of reference symbols

1

electrical arrangement

2

Injection molded part

3

Stamped part

4th

deepening

6a, b

Insulation displacement contact

7th

Terminal contact

8th

Dom

9

Connecting bridge

10

breakthrough

11

Snap / latching element

12th

cover

13a, b

Stamp element

14th

Plug contact (for circuit board)

15th

Centering holes

16

Conductor tracks

17th

Plug contact (for switch)

18th

counter

19th

deepening

20th

Terminal strip for cables

21

Circuit board

22nd

Contact points

23

Control cable

24

Free punching recesses

25th

Pre-molded part

Claims (1)

1. A door drive, comprising an electric assembly (1), and wherein the electric assembly (1) comprises:

   - an injection moulded part (2) made from plastic material, and

   - a metallic stamped part (3),

   - wherein the injection moulded part (2) is formed as a housing for the door drive and/or a power supply unit,
   wherein the injection moulded part (2) is adapted for receiving a cover (12), which includes post elements (13), which correspond to cutting/terminal contacts (6) of the stamped part (3) for producing a cutting/terminal connection,
   wherein

   - the stamped part (3) is positively connected to the injection moulded part (2), in that the stamped part (3) is incorporated in the injection-moulded part (2),

   - and areas of the stamped part (3) protrude from the injection-moulded part (2) for the purpose of electrical contacting, and

   - wherein the protruding areas of the stamped part (3) are formed as cutting/terminal contacts (6) and as plug-in contacts (14).

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