EP3700018A1 - Circuit board direct contact device for making electrical contact and circuit board and electrical device - Google Patents

Abstract

The invention relates to a circuit board direct contacting device for producing an electrical contact between a contact surface on a circuit board and a stripped end of a stranded wire, with a housing, the housing having a circuit board receptacle, a stranded conductor receptacle and a clamping element and the clamping element being arranged so that when pushed in of the printed circuit board in the printed circuit board holder results in a clamping effect on the contact surface of the printed circuit board, the stranded wire holder crossing the printed circuit board holder in such a way that, in the event that the stripped end of the strand is inserted into the wire holder, the stripped end when the printed circuit board is pushed into the printed circuit board holder the strand rests against the circuit board and is pushed in the direction of the clamping element, so that when a clamping effect is achieved on the contact surface, the contact surface and the stripped end of the strand are fixed in their position by clamping and a e electrical direct contact is ensured.

Description

The invention relates to circuit board direct contacting device for producing electrical contact between a contact surface on a circuit board and a stripped part of a stranded wire, as well as a circuit board and an electrical device.

In electrical devices, it is often necessary to establish electrical contact between a printed circuit board, which has electrical components, for example, and a conductor, for example a stranded wire.

Crimping conductors onto an electrical contact by means of clamping screws is known from the prior art. Due to the constant pressure of the clamping screw, however, the conductor material will flow over the long term, which will impair the contact pressure and the connection properties.

Fixed connection by means of soldering is also known from the prior art. In the case of soldered connections, however, the contact properties deteriorate over time due to oxidation of the tin. This can negatively affect the functioning of the electronics. Furthermore, solders are usually expensive materials.

As an alternative, electrical direct contacting is known from the prior art, in which, for example, a force is exerted on the contact surface of the circuit board by means of a pressure spring. In order to establish a contact, however, the pressure spring must first be pushed back by means of a tool, for example by means of a screwdriver so that the conductor, for example the stripped end of a stranded wire, can be inserted. Only rigid conductors can be inserted directly without the aid of a tool, without the need to stretch the spring.

The object of the invention is to improve the state of the art.

The object is achieved by a circuit board direct contacting device for establishing electrical contact between a contact surface on a circuit board and a stripped part of a stranded wire, with a clamping element, a stranded wire guide, a printed circuit board holder and a bending element, the bending element and the stranded wire guide being arranged so that the In or on the strand guide, the stripped part of the strand that is guided essentially vertically between the clamping element and the circuit board is bent to the contact surface of the circuit board by means of the bending element when the circuit board is inserted into the circuit board receptacle and is partially guided onto the circuit board or around the circuit board, the clamping element being so is arranged that when the circuit board is pushed further into the circuit board receptacle in a clamping position, there is an electrical contact between the contact surface of the circuit board and the stripped part of the stranded wire.

In particular, a circuit board direct contacting device is thus provided in which a stripped end or some other stripped part of a stranded wire is bent on the contact surface of a circuit board and fastened there in a clamping manner, so that electrical contact is ensured.

The circuit board direct contacting device can thus in its simplest configuration from one There are clamping element and a circuit board holder with a bending element, the clamping element simultaneously forming the strand guide. For example, a housing can be dispensed with and material savings are made.

By means of the circuit board direct contacting device, for example, a stripped end of a stranded wire that is pre-oriented by means of the strand guide is arranged on the contact surface of the circuit board. In the pre-orientation, the stripped end of the stranded wire is arranged by hand in relation to the clamping element by holding the stranded wire in a vertical position in front of the circuit board direct contacting device. By inserting the stranded wire, the stripped end of the stranded wire is both oriented on the contact surface of the printed circuit board and the stripped end of the stranded wire is transported into the printed circuit board direct contacting device with the aid of the circuit board direct contacting device. This means that two work steps can be carried out with the aid of inserting the circuit board.

A core of the invention lies in the fact that the stripped part (e.g. a stripped end) of the stranded wire is transported in the direction of the clamping element by means of the insertion movement of the circuit board and is clamped on the contact surface of the circuit board.

This eliminates the need to use tools.

Furthermore, a direct contact is implemented, so that a particularly low total resistance is achieved through a reduced number of contact resistances. Every interruption of the current flow (for example by means of a stranded wire) and the new connection via contact points (eg screw terminals, crimp contacts or plug contacts) leads to additional resistances at the contact point. So it comes to the Direct contact only to an additional resistor, so that a comparatively lower total resistance can be achieved.

The following is explained conceptually:

A “stranded wire” is in particular a conductor, such as a cable, for example, and usually has an insulating sheath. In general, the conductor consists of several cores, whereby a solid wire can also form the strand. It is essential that the strand is so flexible that when the circuit board is pushed into the circuit board receptacle, the strand is "bent over" by a thrust force acting on the circuit board.

The "stripped part of the stranded wire" can in particular be a stripped end of the stranded wire from which an otherwise existing plastic sheath has been removed. The term “stripped part of the strand” also encompasses a part of a strand sheathed with an insulating material that has been stripped in the middle.

The "strand guide" corresponds to the desired arrangement of the stripped part of the strand in relation to the clamping element and bending element. The strand guide can be designed, for example, as a shaft in which the stripped part of the strand is guided, or it can also be a surface on or to which the stripped part of the strand is arranged. "Essentially vertical" is to be understood to mean that certain deviations in verticality can be tolerated. It is essential that the stranded wire is "bent over" onto the contact surface of the printed circuit board and that electrical contact is achieved in this way.

A "printed circuit board" is also often referred to as a circuit board. There are mostly electronic ones on the circuit board Arranged components which are electronically connected to one another in the desired manner via lines of the board.

An electrically conductive "contact surface" is usually arranged on the circuit board. This contact surface serves as a contact for the stripped part of the strand and usually represents a pole of a power supply.

A “clamping element” is understood to mean, in particular, a component which brings about a clamping effect with the aid of a clamping force. A clamping force can result from the elastic properties of the component. A clamping element can in particular be a spring.

The clamping element is designed, for example, as a component of a housing or implemented by the same.

A “bending element” can be understood to mean a component against which the stranded wire strikes when the printed circuit board is pushed in and by which the stranded wire is bent over in cooperation with the printed circuit board. The bending element is in particular a web, part of the housing or part of the clamping element. The bending element is suitable, for example, for bending the stripped part of the stranded wire into a position which is necessary for electrical contacting of the stripped part of the stranded wire with the contact surface of the printed circuit board. When the circuit board is pushed in, the stranded wire strikes the bending elements and is bent by them.

While the stranded wire stands transversely to the insertion direction of the circuit board until it makes contact with the bending element, the flexing changes its direction and is oriented parallel to the insertion direction.

A "preparation position" is, for example, a position in which the stripped part of the strand is in the Insertion path of the circuit board is arranged between the circuit board and circuit board direct contacting device. As a result, the stripped part of the stranded wire can be transported by means of the circuit board from the insertion position into the circuit board direct contacting device.

In a "clamping position", the circuit board, around or on which the stripped part of the stranded wire is arranged, can be arranged in or next to the clamping element. This simultaneously results in a clamping effect on the stripped part of the stranded wire and on the contact surface of the printed circuit board, whereby the printed circuit board and the stripped part of the stranded wire are held in the jammed position.

In a further embodiment, the circuit board direct contacting device has in particular a housing which forms the circuit board receptacle and which in particular has the clamping element.

A “housing” is understood to mean, for example, a solid casing which partially covers the clamping element. In particular, the housing has an opening which enables a printed circuit board and a stripped part of a stranded wire to be inserted.

A housing can protect the clamping element from penetrating objects and thus improve its functionality and service life. Furthermore, the housing shields the clamping element from access by users, for example, so that it contributes to an improvement in security. The housing can provide a spatial limitation for the stranded wire, so that it is easier to insert the stranded wire and prevent the stranded wire from slipping out.

In particular, the housing can form the strand guide. This enables a particularly simple mechanical implementation the strand guide can be realized. For example, the housing can provide a shaft which serves as a strand guide.

In order to also provide the bending element in a simple manner, the housing can form the bending element. In particular, since the housing is manufactured by means of injection molding, the strand guide and the bending element can be constructed and easily implemented.

In a particularly simple embodiment, the clamping element forms the bending element. The clamping element can thus provide a stop or, accordingly, a contact surface which serves as a bending element.

In order to facilitate a precise arrangement of the stripped part of the strand in a preparatory position, the strand guide can be designed as a strand receptacle, the strand receptacle crossing the circuit board receptacle in such a way that, in the event that the stripped part of the strand is guided in or on the strand receptacle is, when the printed circuit board is inserted into the printed circuit board receptacle, the stripped part of the strand first rests against the circuit board and then the circuit board and partially the stripped part of the strand are pushed together into the clamping element, so that finally the stripped part of the strand is partially clamped to the contact surface of the Circuit board is electrically connected.

A precise position of the stripped part of the strand can thus be ensured by the strand holder. Furthermore, the strand holder initially enables the stripped part of the strand to be placed, for example, while the circuit board is not inserted until a later point in time, for example. Thus, the positioning of the stripped part of the strand in the preparation position and the insertion of the strand and Jamming and separating electrical contacts in time. Thus, one of the processes can be automated and / or carried out in a country with lower labor costs.

A circuit board direct contacting device for producing an electrical contact between a contact surface on a circuit board and a stripped part of a stranded wire can also be provided with a housing, the housing having a printed circuit board receptacle, a stranded conductor receptacle and a clamping element, and the clamping element being arranged such that there is a clamping effect on the circuit board when the circuit board is pushed into the circuit board receptacle, the strand receptacle crossing the circuit board receptacle in such a way that, in the event that the stripped part of the strand is inserted into the strand receptacle, when the circuit board is pushed into the circuit board receptacle, the stripped part Part of the strand rests against the circuit board and is pushed in the direction of the clamping element, so that when a clamping effect is reached on the contact surface, the contact surface and the stripped part of the strand are fixed in their position in a clamping manner and an electrical ical direct contact is ensured.

Thus, a circuit board direct contacting device can be provided in which, by pushing in the circuit board, the stripped part of a stranded wire is transported into a position in which the stranded wire is clamped on the contact surface of the circuit board.

The circuit board direct contacting device thus consists of a housing which has the circuit board holder, the strand holder and the clamping element. The strand holder is arranged in such a way that the stripped part of the strand which is inserted into the strand holder is located in an insertion path of the circuit board. The insertion path of the circuit board results from the PCB holder, which limits the insertion of the PCB. The stripped part of the strand and thus the non-insulated part of the strand can be pushed into the strand holder.

The strand holder is therefore partially located in the circuit board holder. As a result, the inserted end of the printed circuit board can touch the previously inserted stranded wire when the printed circuit board is pushed in, whereby the pushing-in movement of the printed circuit board is transmitted to the stripped part of the stranded wire. The circuit board and the stripped part of the stranded wire can be pushed together towards, on or next to the clamping element, which results in a clamping effect on the circuit board.

Since the stripped part of the strand is located between the circuit board and the clamping element, the clamping effect can act both on the circuit board and on the stripped part of the strand. As soon as there is a clamping effect on the contact surface, in particular the stripped part of the stranded wire is fastened in a clamping manner on the contact surface of the circuit board. The clamping connection of the stripped part of the stranded wire and the contact surface of the printed circuit board in particular creates an electrical connection.

Another essence of the invention lies in the fact that the stripped part of the stranded wire is transported in the direction of the clamping element by means of the insertion movement of the circuit board and is fastened in a clamping manner on the contact surface of the circuit board.

This eliminates an otherwise necessary work step, since when the circuit board is pushed into the circuit board receptacle, both the circuit board and the stripped part of the stranded wire are pushed into the clamping element or to the clamping element. By arranging the stripped part of the stranded wire in the insertion path of the circuit board, two components be moved at the same time. This saves time during assembly. Furthermore, material can be dispensed with and components such as contacts, contact tongues and solder can be saved.

For example, it is still possible to dispense with the otherwise necessary tools for inserting the stranded wire. In addition, non-rigid conductors can be inserted between the clamping element and the printed circuit board without the aid of tools, without the need to expand the spring separately.

The stranded wire therefore only has to be stripped "bare" at the point to be contacted, while steps otherwise necessary for contacting, such as attaching wire end sleeves, are not required. A subsequent setting of the contact can also be compensated for by pressing down the clamping element. Temperature fluctuations or vibrations can be compensated in this way. Setting is understood here to mean, in particular, a spatial change in the mounting, which can also be caused by cold flow of the metal conductor.

The following terms are explained, with previous definitions being retained and the following definitions merely supplemented or specified:

An “electrical contact” is understood to mean, in particular, a component of an electric circuit, the components of the electrical contact being made of electrically conductive material. In the present case, this serves in particular to supply energy to an electrical circuit.

A “contact area” is in particular an electrically conductive surface of an electrically conductive material.

A “printed circuit board”, also called a circuit board, is understood in particular to be a carrier for electrical components which consists of an electrically insulating material. Circuit boards can furthermore have "conductor tracks" which consist of an electrically conductive material adhering to the circuit board. The printed circuit board thus carries the electrical components, connects them and supplies them with energy.

A “stranded wire” is in particular an electrical conductor made up of several wires that are bundled or wound to form a larger conductor. A stranded wire is therefore more flexible than a solid metal wire of the same cross-sectional area. However, a stranded wire can also be understood to mean a “flexible” solid wire which can be moved by inserting the printed circuit board. A “flexible” solid wire can therefore be a wire which can be moved into the circuit board receptacle by means of the insertion force of the circuit board.

A "circuit board receptacle" can be a recess in the housing which is of a suitable size to receive and guide the circuit board.

A “strand holder” is, in particular, a recess in the housing which has a suitable size to receive and guide a strand.

A "clamping element" can be a component which provides a clamping effect by means of spring pressure. This is in particular a spring, a beveled (counter) hook device or a screw. The circuit board and the stripped part of the stranded wire can thus be fixed in a defined position by means of the clamping element.

A "clamping effect" is based in particular on a force which acts on a surface of a component and that Component fixed in a certain position. Moving the component is thus made more difficult by high friction due to the spring pressure of the clamping element on the surface.

“Fixing in its position by clamping” is understood to mean, in particular, the prevention of mobility of one or more components, the mobility being prevented by a clamping effect. The clamping effect is brought about by the clamping element. As a result of the clamping fixation in one position, neither the circuit board nor the stranded wire can move in relation to the circuit board direct contacting device or in relation to one another. The fixing is caused in particular by the increased friction during the movement of the clamped circuit board or stranded wire or by tilting. A fixed electrical contact thus remains.

“Crossing” is understood to mean in particular an at least point-like intersection. Since the circuit board holder crosses the strand holder, a connected space can be formed. By crossing the printed circuit board holder and strand holder, the stripped part of the strand can be partially located in the printed circuit board holder when the stripped part of the strand is inserted into the strand holder and the printed circuit board makes mechanical contact with the stripped part of the strand when it is inserted.

In a further embodiment, the clamping element is designed as a spring, the spring in particular having a recess for inserting the circuit board, so that when the clamping effect is achieved, the spring is arranged on at least two opposite sides of the circuit board.

A “spring” is understood here to mean, in particular, a body which behaves elastically, that is, under The effect of force changes its shape and essentially returns to its original shape when the force is removed.

Since the spring acts on at least two opposite sides of the circuit board when the clamping effect is reached, a counterpressure is made possible, in particular on the opposite side, which increases the effective spring force or realizes it accordingly.

In order to counteract a pulling out of the circuit board after reaching the clamping effect, the spring can be designed as a wing spring, wherein the wing spring has a first resilient wing, which comes into contact with a first side of the inserted circuit board, and a second resilient wing, which with a opposite side of the inserted circuit board comes into contact, and the first wing and the second wing are inclined along an insertion direction of the circuit board, so that the wing spring achieves a clamping effect on two sides of the circuit board and the wing spring counteracts pulling out the circuit board.

Since the wings of the wing spring are inclined in the direction of an insertion direction of the circuit board, the wings can incline further in the direction of the circuit board when the circuit board is partially pulled out after the clamping effect has been reached. As a result, the clamping effect can be increased so that it is more difficult to pull out the circuit board further. The wings of the wing spring can in particular consist of elastically mounted metal straps. The wing spring can thus perform the function of a barb, since resistance is opposed to the movement of the circuit board in only one direction. While an inserted circuit board is opposed to the increased resistance when pulling it out, the wing spring is when Pushing in the printed circuit board expands and thus creates only a low resistance.

In a further embodiment, the circuit board receptacle is designed as a straight recess in the housing and the recess has a larger volume than the inserted part of the circuit board, so that the recess is suitable for inserting the circuit board.

A “recess” is understood to mean, in particular, a cavity in an object with an opening. The opening can also be referred to as an insertion opening.

Since the recess has a larger volume than the inserted part of the circuit board, the friction when inserting the circuit board can be reduced.

In order to apply the greatest possible force to the stripped part of the stranded wire during insertion by means of the circuit board, in particular by means of the spring, the strand holder in the area of the printed circuit board holder is arranged parallel to the area vector of the side of the printed circuit board with the largest area of the printed circuit board in the inserted state, so that the Strand receptacle introduced, stripped part of the strand in the area of the circuit board receptacle is arranged parallel to the area vector of the side of the circuit board with the largest area in the inserted state.

Thus, the stripped part of the strand is essentially orthogonal to the inserted circuit board and the stripped part of the strand first comes into mechanical contact with the front side of the circuit board when the circuit board is inserted.

The "front side" is in particular the side of the circuit board which is inserted into the circuit board receptacle as the first side. Several pages can be the front at the same time, if the Circuit board receptacle is designed such that several pages are pushed in at the same time, for example when the circuit board is inserted with the tip of a corner of the circuit board. Since the stripped part of the strand is transported by means of the front side of the circuit board, the force vector can be orthogonal to the stripped part of the strand when the circuit board is inserted. In this case an optimal transmission of the force to the stripped part of the strand is guaranteed, whereby the clamping effect is maximized. Furthermore, the risk can thus be reduced that the stripped part of the strand is not transported but is bent away.

In a further embodiment, the contact surface of the circuit board in the inserted state is arranged on one of the largest surfaces of the circuit board.

“One of the largest areas of the printed circuit board” can be understood to mean both the largest area of the printed circuit board and several areas which are each of the same size and which are in themselves larger than any other area of a different size. “A largest area of the printed circuit board” can also be understood to mean the area of the printed circuit board which has electronic components. In particular, it is the top and / or the bottom of the circuit board.

If the direction of insertion is parallel to the largest surface (e.g. top or bottom) of the circuit board, this can expediently lead to the clamping effect of the clamping element counteracting the pulling out of the circuit board. Further fastening of the printed circuit board can thus be dispensed with.

In order to provide protection against incorrect insertion of the circuit board, the stripped part of the strand makes contact with the circuit board when it is inserted in particular mechanically on a first side and a second, opposite side.

With a rectangular circuit board, a rotation security can be achieved in which a rotation of the circuit board relative to the circuit board direct contacting device by 180 ° has no effect, since the stripped part of the strand contacts the contact surface of the circuit board on two sides. The assembly effort can thus be reduced, since a correct insertion direction does not have to be checked.

This can be achieved in that the strand holder extends in two directions from the point at which the strand holder and printed circuit board intersect, so that when the printed circuit board is inserted into the printed circuit board holder, the stripped part of the wire before contacting the PCB and the stripped part of the wire The strand extends further than the first side and the second, opposite side. The stripped part of the stranded wire can thus be located above and below the printed circuit board, for example, before contacting the printed circuit board and the stripped part of the stranded wire. As a result, after contacting the printed circuit board and the stripped part of the strand, the stripped part of the strand can lie on both the first side and the second, opposite side and come into mechanical contact with both sides. A mechanical contact between the stripped part of the stranded wire and the contact surface also creates an electrical contact.

In a further embodiment, the circuit board direct contacting device is at least partially designed as an injection molded part. The clamping element is usually made of an electrically conductive material.

This makes it possible to reduce manufacturing costs. Furthermore, the production can be carried out with high speed, precision and a few work steps.

In a further aspect, the object is achieved by a circuit board which is connected to a previously described circuit board direct contacting device with a stranded wire.

This results in the above-mentioned advantages, particularly when connecting the circuit board to the stranded wire and in the connected state.

By connecting the circuit board and the stranded wire with the aid of the circuit board direct contacting device, a direct contacting device is made possible in particular without the aid of tools, whereby particularly low volume resistances are achieved.

In a further aspect, the object is achieved by an electrical device which has a previously described circuit board direct contacting device or a previously described circuit board.

This in particular enables non-rigid conductors to be connected to the circuit board by means of the clamping element without the aid of tools. In addition, the advantages described above can be realized.

In another aspect, the object is achieved by a method for establishing an electrical contact between a contact surface on a circuit board and a stripped part of a stranded wire by means of a previously described circuit board direct contacting device, the stripped part of the stranded wire being arranged in or on the strand guide, the circuit board in the PCB receptacle is introduced and pushed through so that the stripped part is connected to the contact surface in a clamping manner by means of the clamping element.

Figur 1

eine schematische, seitliche Schnittdarstellung einer Direktkontaktierungsvorrichtung mit einem Leiterplattenschacht, einem Litzenschacht, einer Klemmfeder und einem Gehäuse,

Figur 2

die Direktkontaktierungsvorrichtung mit einem eingeschobenen abisolierten Ende einer Litze und einer Leiterplatte, wobei ein elektrischer Kontakt zwischen dem abisolierten Ende der Litze und der Leiterplatte hergestellt ist,

Figuren 3a bis 3f

die Direktkontaktierungsvorrichtung mit dem eingeschobenen abisolierten Ende der Litze und der Leiterplatte in sechs Schritten,

Figur 4a

eine schematische, perspektivische Darstellung einer ersten alternativen Direktkontaktierungsvorrichtung mit einem Leiterplattenschacht, einem Litzenschacht, einem Gehäuse und zwei Litzenösen,

Figur 4b

eine schematische, perspektivische Schnittdarstellung der ersten alternativen Direktkontaktierungsvorrichtung und

Figur 5

eine schematische, perspektivische Aufsicht der ersten alternativen Direktkontaktierungsvorrichtung.

Figur 6

eine schematische, seitliche Schnittdarstellung einer zweiten alternativen Direktkontaktierungsvorrichtung mit einem Leiterplattenschacht, einem Litzenschacht, einer Flügelfeder und einem Gehäuse,

Figur 7

die zweite alternative Direktkontaktierungsvorrichtung mit einem eingeschobenem abisoliertem Ende der Litze und der Leiterplatte,

Figuren 8a bis 8f

eine schematische, seitliche Schnittdarstellung der zweiten alternativen Direktkontaktierungsvorrichtung mit dem eingeschobenen abisolierten Ende der Litze und Leiterplatte in sechs Schritten,

Figur 9a

eine schematische, perspektivische Darstellung einer dritten alternativen Direktkontaktierungsvorrichtung mit einem Leiterplattenschacht, einem Litzenschacht und einer Flügelfeder sowie mit einer eingeschobener Litze und einer Leiterplattenzunge,

Figur 9b

eine schematische, seitliche Schnittdarstellung der dritten alternativen Direktkontaktierungsvorrichtung,

Figur 10a

eine schematische, perspektivische Darstellung einer vierten alternativen Direktkontaktierungsvorrichtung mit einem Leiterplattenschacht, einer Flügelfeder sowie einem Gehäuse,

Figur 10b

eine schematische, perspektivische Darstellung der vierten alternativen Direktkontaktierungsvorrichtung abgebildet ohne Gehäuse,

Figur 11a

eine schematische, perspektivische Darstellung einer Unterseite der vierten alternativen Direktkontaktierungsvorrichtung und

Figur 11b

eine schematische, seitliche Schnittdarstellung der vierten alternativen Direktkontaktierungsvorrichtung abgebildet ohne Gehäuse.

The invention is explained in more detail below using an exemplary embodiment. It shows

Figure 1

a schematic, lateral sectional illustration of a direct contacting device with a circuit board slot, a litz cable slot, a clamping spring and a housing,

Figure 2

the direct contacting device with an inserted stripped end of a stranded wire and a printed circuit board, an electrical contact being established between the stripped end of the stranded wire and the printed circuit board,

Figures 3a to 3f

the direct contacting device with the inserted stripped end of the stranded wire and the circuit board in six steps,

Figure 4a

a schematic, perspective illustration of a first alternative direct contacting device with a circuit board slot, a litz cable slot, a housing and two litz wires,

Figure 4b

a schematic, perspective sectional illustration of the first alternative direct contact-making device and

Figure 5

a schematic, perspective top view of the first alternative direct contact-making device.

Figure 6

a schematic, lateral sectional view of a second alternative direct contacting device with a circuit board slot, a litz cable slot, a wing spring and a housing,

Figure 7

the second alternative direct contacting device with an inserted stripped end of the stranded wire and the circuit board,

Figures 8a to 8f

a schematic, lateral sectional view of the second alternative direct contacting device with the inserted stripped end of the stranded wire and printed circuit board in six steps,

Figure 9a

a schematic, perspective illustration of a third alternative direct contacting device with a circuit board slot, a litz cable slot and a wing spring as well as with an inserted litz wire and a circuit board tongue,

Figure 9b

a schematic, lateral sectional view of the third alternative direct contacting device,

Figure 10a

a schematic, perspective illustration of a fourth alternative direct contacting device with a circuit board slot, a wing spring and a housing,

Figure 10b

a schematic, perspective illustration of the fourth alternative direct contacting device shown without a housing,

Figure 11a

a schematic, perspective illustration of an underside of the fourth alternative direct contacting device and

Figure 11b

a schematic, side sectional view of the fourth alternative direct contacting device shown without a housing.

A direct contact-making device 101 has a housing 111, a litz cable slot 115, a circuit board slot 113 and a clamping spring 117.

The housing 111 is essentially rectangular and made of polypropylene by means of injection molding. The housing 111 consists of two parts which are plugged together and enclose the clamping spring 117.

The circuit board slot 113 is formed by a cutout in the housing 111 and has an insertion opening 121 on a left side 127. The circuit board slot 113 is at right angles to the left side of the housing 127 and runs essentially parallel to a lower side of the housing 129.

The litz shaft 115 is formed by a cutout in the housing 111 which runs essentially parallel to the left side 127. The litz shaft 115 has openings on the lower side of the housing 129 and an upper side of the housing 131. The strand slot 115 is at right angles to the circuit board slot 113 and crosses the Circuit board slot 113. By crossing the circuit board slot 113 and the litz cable slot 115, a common cavity 125 is formed.

The clamping spring 117 is composed of a sheet metal loop 133, which is oriented in the direction of the upper side of the housing 131, and a base plate 135 connected to it, which is oriented in the direction of the lower side of the housing 129. The sheet metal loop of the clamping spring 117 provides the clamping effect, while the base plate of the clamping spring 135 generates a counter pressure. The clamping spring 117 is arranged at the end of the circuit board slot 113 and has an open side 118 in the direction of the insertion opening 121.

In an insertion direction 123 of the circuit board 105, starting from the insertion opening 121 in the litz cable slot 115, the circuit board slot 113 and the clamping spring 117 are arranged.

The circuit board slot 113 is larger than the circuit board 105, so that it is suitable for inserting the circuit board 105. The circuit board 105 is made of fiber-reinforced plastic. On its top side 119, electrical components 137 are arranged, which are connected to one another in an electrically conductive manner with conductor tracks. In addition, the upper side has a contact surface which is connected to the conductor tracks.

The contacting process is described below:

The strand 109 is inserted with its stripped end 107 on the lower side of the housing 129 into the strand shaft 115 and pushed through until the stripped end of the strand on the upper side of the housing 131 protrudes about 0.5 cm from the housing.

When inserting the circuit board 105 through the insertion opening 121 in the insertion direction 123 into the Circuit board slot 113, the circuit board 105 is first guided along in circuit board slot 113. After passing through the insertion opening 121, the printed circuit board 105 makes contact with the stranded wire 109 at the stripped end of the stranded wire 107 in the common cavity 125.

After the printed circuit board 105 has made mechanical contact with the stripped end of the stranded wire 107, the printed circuit board 105 is pushed in further, so that the printed circuit board 105 transports the stripped end of the stranded wire 107 in the direction of the clamping spring 117. As a result, the stripped end of the strand 107 is drawn into the circuit board slot 113 and lies on the side of the circuit board 105 on which the contact surface is located.

When it is pushed in further, the printed circuit board 105 first contacts the clamping spring 117 and is then pushed into the clamping spring 117. The circuit board 105 presses the elastic sheet metal loop 133 of the clamping spring 117 against its spring force in the direction of the upper side of the housing 131, so that a space is formed for the circuit board 105, into which it is inserted. The stripped end of the strand 107 is located between the circuit board 105 and the clamping spring 117 and is thereby pressed against the circuit board 105 by the clamping spring 107. As soon as the circuit board 105 has been pushed completely under the clamping spring 107, the spring force of the clamping spring 117 acting on the circuit board 105 and thus the clamping effect is maximized.

The stripped end of the strand 107 is thus pressed onto the contact surface of the circuit board 105 in a clamping manner. Since both the contact surface of the circuit board 105 and the stripped end of the strand 107 have an electrically conductive surface, an electrical direct contact is established and the electrical components on the circuit board can be supplied with electrical energy.

A first alternative direct contacting device 401 has a housing 411, a litz cable slot 415, a circuit board slot 413 with an insertion opening and a clamping spring 417. The direct contacting device 401 additionally has two litz wires 443.

The housing 411 is manufactured in two parts by means of injection molding and encloses the clamping spring 417.

The litz shaft 415 is formed by means of an opening in the upper side 431. The litz wires 443 are arranged on a rear side of the housing 432. The heald eyes 443 are arranged transversely to the insertion direction 123 and run parallel to the heald shaft 415.

The contacting process is described below:

The stripped end of a stranded wire is pushed from below in a threading direction 445 through the stranded wire eyelet 443. After three centimeters of the stripped end of the strand 107 have been pushed through the strand eyelet 443, the tip of the stripped end of the strand 107 is bent by approximately 180 degrees and completely inserted into the strand shaft 415 from above.

The circuit board 105 is then inserted into the insertion opening in the circuit board slot 413. The circuit board 105 makes mechanical contact with the stripped part of the stranded wire, bends it and pushes it into the clamping spring, so that a clamping, electrically conductive contact takes place between the stripped end of the stranded wire 107 and a contact surface of the circuit board 105.

A second alternative direct contacting device 601 has a printed circuit board slot 613, a litz cable slot 615, a housing 611 and a wing spring 618.

The wing spring 618 comprises a circumferential metal frame and two sheet metal tabs 639.

The sheet metal tabs 639 are each slightly bent out in relation to the metal frame, so that the metal frame and sheet metal tabs 639 form an isosceles triangle with an open tip in a side view, the tip protruding into the circuit board slot 613.

The contacting process of the alternative direct contacting device is described below:

Until the wing spring 618 is contacted, the contacting process proceeds analogously to the direct contacting device described above.

When the circuit board 105 is pushed further into the circuit board slot 613, the stripped end of the stranded wire 107 wraps around the top side 119 and the opposite side of the circuit board 105.

After the wing spring 618 has been contacted by the printed circuit board 105 and the stripped end of the strand 107, the sheet metal tab 639 at the top is pressed against its spring force towards the top of the housing 631 and the sheet metal tab 639 at the bottom is pressed against its spring force towards the bottom of the housing 629. The tip open by the sheet metal tabs 639 is widened. As a result, the sheet metal tabs 639 act as a spring element, resulting in a clamping effect on two sides of the circuit board 105 and the stripped part of the strand 107 being pressed onto the contact surface of the circuit board 105.

In addition, the sheet metal tabs 639 act as barbs and thus make it more difficult to pull out the circuit board 105.

A third alternative direct contacting device 901 has a wing spring 918 with a printed circuit board slot and a bending bar 941. The circuit board bay is supported by a metal frame 921 and the two sheet metal tabs 939 of the wing spring 918 are formed. The bending bar 941 is formed by part of the frame 921.

The contacting process is described below:

The stripped end 107 of the strand 109 is positioned by hand in front of the two bending strips 941 between the wing spring 918 and a contacting tongue of the circuit board 905, the contacting tongue having a contact surface.

The contacting tongue of the circuit board 905 is inserted in an insertion direction 123 towards the circuit board slot and makes contact with the stripped end of the strand 107. When further insertion in the insertion direction 123, the tongue of the circuit board 905 presses against the stripped end of the strand 107, whereby the stripped end of the strand 107 is held back by the bending strips 941 at the same time and lies around the contacting tongue of the circuit board 905 until the stripped end of the strand 107 rests on the top of the circuit board 919 and the opposite side of the circuit board 905 on the contact surface.

The contacting tongue of the printed circuit board 905 and the stripped end of the stranded wire 107 are held in their position by the clamping effect of the wing spring 918 and electrical contacting is implemented.

A fourth alternative direct contacting device 1001 has a housing 1011, a double spring 1020 and a circuit board slot 1013, the circuit board slot 1013 being formed by the double spring 1020.

The double spring 1020 is formed by a circumferential sheet metal which is guided along the upper side of the housing 1031, the rear side of the housing, which is located opposite an insertion opening 1021, and the lower side of the housing. On the side of the insertion opening 1021, the double spring 1020 has two sheet metal tabs 1039, which are bent into the interior of the double spring 1020 and have two bending strips 1041. The sheet metal tabs 1039 are flexible and act as a spring element.

The housing 1011 is manufactured from polypropylene by means of injection molding, so that the double spring 1020 can be pushed into the housing 1011 during the manufacture of the alternative direct contacting device 1001. The housing 1011 encloses all sides except the rear side and the front side, in which the insertion opening 1021 is located.

The contacting process is described below:

Analogously to the previous embodiment, the stripped end of the strand 107 is aligned by hand. The further insertion and clamping process is analogous to the previous embodiment.

List of reference symbols

• 101 direct contact device
• 105 circuit board
• 107 Stripped end of the strand
• 109 strand
• 111 housing
• 113 PCB slot
• 115 Litz shaft
• 117 spring clip
• 118 open side of the clamping spring
• 119 Top of the PCB
• 121 slot
• 123 Direction of insertion
• 125 common cavity of the litz cable slot and the circuit board slot
• 127 left side of the case
• 129 lower side of the case
• 131 upper side of the case
• 132 Rear of the case
• 133 elastic sheet metal loop of the clamping spring
• 135 Base plate of the clamping spring
• 137 electrical components
• 401 first alternative direct contacting device
• 411 first alternative housing
• 413 first alternative printed circuit board slot
• 415 first alternative litz shaft
• 417 first alternative clamping spring
• 429 lower side of the case
• 431 upper side of the case
• 432 back of the case
• 443 wire eyelets
• 445 threading direction
• 601 second alternative direct contact device
• 611 housing
• 613 PCB slot
• 615 litz shaft
• 618 wing spring
• 621 slot
• 627 left side of the housing
• 629 lower side of the case
• 631 upper side of the case
• 639 metal tabs
• 901 third alternative direct contact device
• 905 alternative PCB with PCB tongue
• 918 alternative wing spring
• 919 Top of the alternative circuit board
• 921 frame of the wing spring
• 939 alternative sheet metal tabs of the alternative wing spring
• 941 bending bar
• 1001 fourth alternative direct contacting device
• 1011 housing
• 1013 PCB slot
• 1020 double spring
• 1031 upper side of the case
• 1039 sheet metal tab of the double spring
• 1041 bending bars

Claims (12)

Circuit board direct contacting device (101, 401, 601, 901, 1001) for producing an electrical contact between a contact surface on a circuit board (105, 905) and a stripped part (107) of a stranded wire (109), with a clamping element (117, 618, 918 , 1020), a strand guide (115, 615), a printed circuit board holder (113, 413, 613, 913, 1013) and a bending element, the bending element and the strand guide being arranged so that the in or on the strand guide is essentially vertically between The stripped part of the strand guided by the clamping element and the printed circuit board is bent to the contact surface of the printed circuit board by means of the bending element when the printed circuit board is inserted into the printed circuit board receptacle and is partially guided onto the printed circuit board or around the printed circuit board, the clamping element being arranged in such a way that the Circuit board in the circuit board receptacle in a clamping position an electrical contact between the Kontaktflä surface of the circuit board and the stripped part of the strand. Circuit board direct contacting device according to Claim 1, characterized by a housing (111, 411, 611, 1011) which forms the circuit board receptacle and which in particular has the clamping element. Circuit board direct contacting device according to claim 2, characterized in that the housing forms the strand guide. Circuit board direct contacting device according to claim 2 or 3, characterized in that the housing forms the bending element. Circuit board direct contacting device according to one of Claims 1 to 3, characterized in that the clamping element forms the bending element. Circuit board direct contacting device according to one of the preceding claims, characterized in that the strand guide is a strand holder which crosses the circuit board holder in such a way that, in the event that the stripped part of the strand is guided in or on the strand holder, when the printed circuit board is pushed into the printed circuit board holder the stripped part of the strand first rests against the circuit board and then the circuit board and partially the stripped part of the strand are pushed together into the clamping element, so that finally the stripped part of the strand is connected to the contact surface of the circuit board in an electrically conductive manner. Circuit board direct contacting device according to one of the preceding claims, characterized in that the clamping element is designed as a spring, the spring in particular having a recess for inserting the circuit board so that in the clamping position the spring is arranged on at least two opposite sides of the circuit board. Circuit board direct contacting device according to claim 7, characterized in that the spring is designed as a wing spring (618, 918), the wing spring having a first resilient wing, which in particular makes contact with an upper side (119, 919) of the inserted circuit board, and has a second resilient wing , which in particular contacts an underside of the inserted circuit board, and the first wing and the second wing are inclined in relation to an insertion direction (123) of the circuit board, so that the wing spring a Causes clamping of the circuit board and the wing spring counteracts pulling out of the circuit board. Circuit board direct contacting device according to one of the preceding claims, characterized in that the circuit board direct contacting device is designed such that, in the clamping position, the stripped part of the stranded wire mechanically contacts the circuit board on the top (119, 919) and the bottom. Circuit board which is connected to a stranded wire by means of a circuit board direct contacting device according to one of the preceding claims. Electrical apparatus comprising a circuit board direct contact device according to one of Claims 1 to 9 or a circuit board according to Claim 10. Method for establishing an electrical contact between a contact surface on a circuit board and a stripped part of a stranded wire by means of a circuit board direct contacting device according to one of claims 1 to 9, wherein the stripped part of the stranded wire is arranged in or on the strand guide, the circuit board is inserted into the printed circuit board receptacle and pushed through is so that the stripped part is clamped to the contact surface by means of the clamping element.

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