WO2011003378A1

WO2011003378A1 - Contact pin having a stop

Info

Publication number: WO2011003378A1
Application number: PCT/DE2010/000672
Authority: WO
Inventors: Michael Herrmann
Original assignee: Willy Kreutz Gmbh & Co. Kg
Priority date: 2009-07-08
Filing date: 2010-06-16
Publication date: 2011-01-13

Abstract

The invention relates to a contact pin (01) for use on a lighting means, comprising a main body (02), which has a recess on the inside for contacting with a wire. At the first end of the contact pin (01), the contact pin has a contact section (07) for establishing the contact of the lighting means upon insertion into the socket provided therefor. At the second end of the contact pin (01), the contact pin has a fastening section (03), by means of which the contact pin (01) can be fastened in a corresponding hole on the lighting means. A stop is required for the secure fastening to the lighting means, which stop is formed by a plurality of raised areas (05).

Description

Contact pin with stop

The invention relates to a contact pin for use on lighting means, wherein on the periphery of a stop having a plurality of elevations is present.

Various types of contact pins are known from the prior art. As a rule, these contact pins are rotationally symmetrical. The production is usually carried out by a cutting process of a round bar. Optionally, it is also possible to preform the contact pin previously partially by a forming process. By, the method of the prior art is given a rotationally symmetric, but otherwise free form design.

When used as a contact pin for lighting means, it is necessary for the contact pin to have a corresponding fastening section. In the later end function on the lighting means is necessarily correspondingly a contact portion to ensure the plug-in function available. In the case of halogen lamps, it is customary for this contact section to be formed by a thickened head. In the usual application, the attachment portion is formed from a cylindrical portion, with the end of the contact Pen serves as a rivet approach. Depending on the mounting, it is necessary that there is a stop on the circumference of the contact pin. This serves both as a stop during the assembly of the contact pin in the Beleuchtungsmittelbefestigungsaufnahme and for the following riveting as an abutment for riveting. In this respect, the stop is largely responsible for the secure hold of the contact pin in the lighting means.

In order to ensure the riveting ability, it is not possible in the method known from the prior art to produce the contact pin completely, in particular in the riveting area, by forming. In tests, this leads to material hardening in the riveting approach and during riveting to break the rivet neck. Therefore, almost always the stop is made by a cutting process. In this respect, this leads to higher costs due to the processing. Due to the manufacturing process of the stop - as previously stated - basically rotationally symmetric, ie cylindrical. In the use of the contact pin to halogen lights, however, the contact surface on the halogen lamp on a sometimes not flat surface. Even the slightest bumps can mean that no secure position of the contact pin in the lighting means is guaranteed and there can be minimal play. Even though the plug-in function and the maintenance of the luminaire in the respective version are still guaranteed, this phenomenon of "wobble" is a quality defect for the user can be made cheaper and at the same time ensures a better investment in the lighting means. This object is achieved by the contact pin according to the invention according to claim 1. A method for producing the contact pin according to the invention is specified in claim 7.

Advantageous embodiments are the subject of the dependent claims. The contact pin for use on a lighting means initially comprises a base body. The main body is usually a cylinder, the exact form is not essential to the nature. in the

The base body has at least partially a recess. In this, the contact element of the lighting means, usually a wire, can be contacted with the contact pin. On the base body at the end facing away from the illumination means, this has a contact portion. This contact section is used in a known manner for the production of the plug contact. On the other side on the base body at the end facing the illumination means this has a mounting portion. This attachment portion in turn can be introduced into a recess on the illumination means to be fixed in the illumination means accordingly. The attachment portion is limited at the periphery of the body by a projecting stop. This stop can thus come to rest on a contact surface on the lighting means when inserted into the recess on the lighting means.

The inventive feature in the contact pin is that the stop is formed by at least two elevations, which protrude beyond the circumference of the body. By changing the usual from the prior art stopper shape in a cylindrical design towards a plurality of surveys a stable and secure investment is ensured on the lighting means. In this respect, this ensures that minor unevennesses on the contact surface are no longer relevant for the secure position of the contact pin on the lighting means. In an advantageous embodiment, the stop is formed by three to six elevations. From three surveys in particular a defined position is given to the contact surface of the lighting means. With more than six surveys - depending on the design of the surveys - there is hardly any difference to the previous state of the art with the cylindrical form.

To produce the electrically conductive connection of the contact pin with the contact element or wire, it is possible in a simple form to use a cylindrical bore. To ensure a faultless and easy mounting of the contact element in the contact pin has the bore to the side of the attachment portion an insertion bevel.

As a rule, the contact pin is fastened to the lighting means by means of rivets. In this respect, the contact pin advantageously has a rivet attachment at the attachment portion. This rivet approach is formed by the fact that the wall thickness is significantly reduced correspondingly at the attachment portion in the area to be riveted. It is also advantageous if the wall on the rivet attachment has a discontinuous wall thickness with several weakenings. In a special design of the contact pin for correspondingly uneven contact surfaces on the lighting means, a special shape of the surveys can be selected. For this purpose, the free ends of the elevations are at least a little way over the attachment portion. In this respect, an investment at a theoretical level results in a free space between this theoretical level and the elevations near the attachment section.

In particular, in this case advantageously a spherical shape for the contact surfaces of the elevations, which come to rest on the contact surface on the lighting means, are selected. To produce the contact pin according to the invention, a base body is first required as the starting material. For the preparation of this base regular application methods known from the prior art can be used. As a rule, a cylindrical rod material is first cut to an initial length. If the insert is provided on a halogen lamp, it is necessary to first mold a head. This can be done by a multi-stage upsetting process, wherein the corresponding head is formed with a free space therein. This head forms the later contact section of the contact pin. However, the shape of the contact portion is not essential to the inventive method for producing an advantageous contact pin.

By the inventive method, the inventive contact pin is now produced. By a deformation of the body in this case the elevations are produced. A characteristic feature here is that a plurality of elevations are present, which are in the sum deviating from a cylindrical stop, as known from the prior art.

The production and application of the forming process can be carried out in three different process variants.

In a first variant, a scraping process is used for the forming process. Here, material is displaced on the outer circumference of the base body in the region of the fastening portion essentially in the direction of the longitudinal axis of the base body with a tool. This material displaced in the axial direction from the attachment section in the direction of the contact section at least partially forms these elevations, with the material flowing radially outward.

A second process variant is formed when an extrusion process is used during the forming process. In this case, material in the core of the body in the region of the attachment section in axial direction displaced in the direction of the contact portion. This displaced volume of material at least partially forms the elevations by material in the region of the elevations flows radially outward from the core. In addition, in the third case, a combination of the previously used methods is possible. Here, in a first step, material is displaced from the core of the main body in the region of the fastening section by means of an extrusion process. In this case, in particular the outer circumference of the base body is widened. By correspondingly advantageous design of the press ram used with a polygonal structure or a non-cylindrical shape is achieved that is increased unevenly in particular in the axial extension of the surveys to be formed, the outer circumference. In a subsequent scraping process in the second step, the material on the enlarged outer circumference of the main body is again substantially in

Direction of the longitudinal axis of the body displaced with another tool. This material in turn forms the elevations, as in the first method, wherein in turn the material flows radially outward.

In all the methods presented, in particular in the third method, the process-related formation of weakenings at the attachment section offers a particular advantage with regard to easier rivetability of the contact pin. In the position of the elevations, a smaller wall thickness is realized in the attachment section by the method according to the invention. If a machining of the fastening portion takes place after the production of the elevations and thus again a uniform wall thickness is present, there remains a discontinuous solidification of the material. This alternate solidification of the material facilitates the riveting process, in that the wall is allowed to rupture parallel to the pin axis in the number of ridges. In the following, the core can be constructed by means of a method customary in the prior art, so as to form the corresponding recess for receiving the wire.

If a reduced outside diameter on the base body is required for fastening in the lighting device, it is possible to finish it by machining.

In the following figures, the inventive shape is again shown using various examples. Show it:

Fig. 1 shows examples of contact pins made by scraping process;

2 shows examples of contact pins on which the end is machined

was reworked;

3 shows examples of contact pins to which the third method variant was applied; Fig. 4 shows an embodiment of a conventional contact pin;

Fig. 5 shows the attachment portion of a lighting means with two

Contact pins;

FIG. 6 is a sketch of the scraping process for producing the contact pin according to the invention; FIG. Fig. 7 sketchy the manufacturing process, starting from a cylindrical blank to the finished contact pin;

8 is a sketch of the second production variant for producing a corresponding contact pin;

9 is a sketch of the manufacturing process starting from the cylindrical base body to the finished contact pin by means of the second process variant; Fig. 10 special forms of the embodiment according to the invention with a plurality of elevations;

Fig. 1 sketchy special versions of the surveys.

In the figure Ia an exemplary embodiment of the inventive contact pin 01 a is shown. As can be seen, this is a contact pin 01 a for a halogen lamp with a correspondingly enlarged head 07 on one side of the cylindrical body 02 for the production of the plug contact. On the other side of the main body 02 is the attachment portion 03. Inside is the recess 04 for introducing the contact element or the wire for contacting the contact pin 01 with the illumination means. In this embodiment, four elevations 05 are shown on the periphery. As can be seen, these form by Abschabungen I I a on the outer circumference of the body 02. In Figure Ib, a further variant of the contact pin 01 b according to the invention is shown. This embodiment largely corresponds to the aforementioned embodiment, wherein in this case the Abschabungen I I b to form the surveys are designed such that a significant weakening of the wall on the body 02 is present. Thus, in this embodiment, the rivetability can be improved.

FIG. 2 a shows a further form of the contact pin 01 c according to the invention. In this case, the contact pin 01 c has three elevations, wherein in the attachment portion above the elevations of the outer circumference was turned by a machining and thus forms a cylindrical shoulder 12c.

In Figure 2b, in turn, another variant of a contact pin 01 d is shown. In this case, only the end portion of the attachment portion 03 is turned off on the contact pin 01 d. In this respect, the forms Paragraph 12d a thin wall, which preferably has a thin wall thickness for the corresponding riveting operation.

FIG. 3 a again shows a variant of the contact pin O 1 according to the invention. In this case, the contact pin O l e has three projections 05 e, which together form a polygon. In the same position, there is also a triangular polygon 13e inside. This embodiment is formed by first forming the inner polygon 13e by means of an extrusion process, with material being displaced outwards in the attachment section. In the following, a scraping process forms the three surveys.

In Figure 3b, this is illustrated by means of the plan view of the contact pin Ol e of Fig. 3a again. In the position of the elevations 14e, material is displaced outwards in the direction of the position of the elevations 14e by the first process step by means of the inner polygon 13e. This projecting over the cylinder shape material can be scraped off by means of a punch tool and thus forms the same elevations 05e. At the same time it can be seen clearly that at the same time weakenings in the wall in the attachment portion in the region of the position of the elevations 14e are present by means of this type of process. Thus, at the same time the rivetability is improved.

FIG. 3c shows a further variant of the contact pin, wherein it has been produced in the same way as the previously mentioned variant from FIG. 3a. In this case, six elevations are now available, wherein a hexagon is formed in the interior accordingly. This is also illustrated in FIG. 3d. In this respect, the nature of the inner polygon does not have to have exactly one contour parallel to the elevations.

FIG. 4 shows a conventional contact pin of the prior art. This consists accordingly of a rotationally symmetrical body, which is usually made by a cutting process. This also has a head 07 on the contact side and inside the head a free space 10. About the body 02 is the stop 06, which serves for mounting and fastening of the contact pin in the lighting means, over. Above the stop 06 on the attachment portion 03 there is also a free space 09 inside. This clearance 09 is mainly designed to facilitate the subsequent riveting operation. The recess 04 for contacting the conductor of the illumination means is realized primarily through the bore 08. The shape of the recess 04 or the bore 08 does not differ significantly from the inventive solution.

FIG. 5 shows the fastening section 16 of a luminaire. This has a corresponding contact surface 17 for attachment of the contact pins 01. Shown is the installation of a fully riveted contact pin 01 h and an inserted pin 01 e. The attachment is effected by means of a riveting tool 18 and thus causes the fixed connection of the contact pin 01 with the illumination means.

In FIG. 6, the inventive method step for forming the contact pin in a variant is roughly outlined. Here, the contact pin is firmly clamped with its body 02 in a tool 20.

By means of a moving punch 21 in the forming tool, the survey 05 is formed by the Abschabevorgang invention.

FIG. 7 shows an exemplary sequence of process steps for forming the contact pin starting from a cylindrical base body 30. In this case, the head usually encountered on one side is first formed in two steps and, as shown, forms the body 3 1 b via the step 31 a in the following. This is the starting material for the method step according to the invention. By Abschabevorgang a corresponding prepared contact pin 32 is prepared. This has correspondingly the elevations, but it is still without the recess for contacting the contact elements. In the following, the recess is introduced by a cutting process in the interior and thus forms the first variant of the contact pin 01 b. On this basis, it is possible to produce the variants Ol d and 01 c by a further twist on the attachment portion.

FIG. 8 outlines an alternative method step for forming the elevations according to the invention. In this case, in turn, the main body 02 is clamped in a fixed tool 22. By means of a moving punch 23, material is displaced out of the core of the base body, which in turn causes a flow of material to form the elevations 05.

FIG. 9 shows possible method steps for forming the contact pin by utilizing the method by means of displacement from the core of the main body. The starting material in turn is the cylindrical basic body 30. The formation of the head is represented by the steps 31 a, 31 b and 31 c. In the following, the corresponding core is displaced from the base body by the extrusion process and forms the elevations forming the body 33. By drilling the core and forming the recess, a variant of the contact pin 01 j according to the invention is produced.

FIG. 10 a shows a special form of the contact pin. In this case, in turn, the elevations 05 are formed by scraping from the main body 02. However, the moving tool part does not act exactly axially in the direction of the contact pin, but slightly inclined to the axis in the direction of movement 24, as shown in section 10b.

In the figures I Ia and I Ib special forms of the elevations 05 are shown in section. In the first case, a spherical shape is realized and in the second case, the elevation 05c forms a flat surface. In both cases there is an undercut or the outer end of the survey gene, which would rest against the contact surface of the illumination means, is above the contact portion facing the end of the attachment portion 03b.

Claims

claims

A contact pin (01) for a lighting means, comprising a

Base body (02), wherein the base body (02) at least in sections a recess (04) in which a contact element, in particular a wire, the illumination means is kontaktbar bar, and wherein the base body (02) facing away from the illumination means end has at least one contact portion (07), and wherein the base body (02) at the end facing the illumination means has a fixing portion (03) which is insertable into a recess on the illumination means, and wherein the attachment portion (03) by one over the circumference the abutment in the recess on the illumination means on a contact surface (17) can come to rest on the illumination means of the base body (02) projecting stop

characterized,

the stop is formed by at least two elevations (05) which project beyond the circumference of the main body (02).

2. contact pin (01) according to claim 1,

characterized,

the stop is formed by 3 to 6 elevations (05).

3. contact pin (01) according to claim 1 or 2

characterized,

in that the recess (04) for receiving the contact element is formed by a central bore (08), wherein an insertion bevel is present in particular on the side of the fastening section (03).

4. contact pin (01) according to one of claims 1 to 3, characterized

in that a rivet attachment (15) is present on the attachment section (03).

5. contact pin (01) according to claim 4,

characterized,

the wall of the rivet attachment (15) has a discontinuous wall thickness and / or discontinuous material consolidation with several weakenings.

6. contact pin (01) according to one of claims 1 to 5,

characterized,

the free end of the elevations (05), which can come into contact with the abutment surface (17) of the luminaire, projects at least a little beyond the attachment section (03).

7. contact pin (01) according to one of claims 1 to 6,

characterized,

the side of the elevations (05) facing the fastening section (03) has a spherical shape.

8. A method for producing a contact pin (01) according to a

previous claims,

characterized,

that the elevations (05) are produced by deformation of the main body (02).

9. The method according to claim 8,

characterized,

that the forming process comprises a scraping process in which material on the outer circumference of the base body (02) in the region of the fastening portion (03) is displaced substantially in the direction of the longitudinal axis of the base body (02) with a tool (21), wherein the displaced material at least partially flows radially outward to form the elevations (05).

10. The method according to claim 8,

characterized,

in that the forming process comprises an extrusion process in which material is displaced with a tool (23) in the core of the base body (02) in the region of the fastening section (03), the displaced material volume at least partially flowing radially outwards and forming the elevations (05) ,

1 1. A method according to claim 8,

characterized,

that the forming process includes the following steps:

(A) an extrusion process in which material in the core of the base body (02) in the region of the fastening portion (03) is displaced, wherein the outer periphery of the base body (03), in particular in axial extension of the surveys to be formed (05), increases will, and

(B) a Abschabeprozess in which the material at the enlarged outer periphery of the base body (02) substantially in the direction of the longitudinal axis of the base body (02) with a tool (21) is displaced, wherein the displaced material at least partially to form the elevations (05 ) flows radially outward.