Connecting element

Abstract

A connection element for the electrical connection of an LED light source, wherein the LED light source has a printed circuit board which is provided with contact fields for the electrical supply of the LED, and also has a substantially annular contact arrangement which is intended to overlap the printed circuit board and to mechanically hold it on an arrangement surface of a heat sink, with a contact arrangement which is mounted in the frame and serves to electrically supply the LED, wherein the frame is divided into a first ring and a second ring, the first ring is intended as an outer ring to surround the printed circuit board and to hold it parallel to the arrangement surface of the heat sink, and the second ring is seated as an inner ring coaxially in the outer ring and overlaps the printed circuit board at least in some areas, and is intended to hold the printed circuit board in a vertical direction to the arrangement surface of the heat sink, characterized in thatthat the connecting element has a fastening part, the fastening part is seated in a receptacle in the outer ring and the inner ring has a counter bearing for the fastening part and the fastening part engages in the counter bearing essentially parallel to the arrangement surface of the heat sink and fixes the inner ring in the outer ring.,

Description

[0001] The invention relates to a connection element for the electrical connection of an LED illuminant, wherein the LED illuminant has a printed circuit board which is provided with contact fields for the electrical supply of the LED, as well as with a substantially annular frame which is intended to cover the printed circuit board and to hold it mechanically on an arrangement surface of a heat sink and with a contact arrangement which is mounted in the frame and serves to supply the electrical supply of the LED.

[0002] A generic connection element is known from the applicant's German patent DE 10 2008 005 823 A1. In this connection element, a ring element overlaps the circuit board and holds it between itself and a counter-bearing, in particular a heat sink. The ring element is designed to have housings for contact elements. The contact elements are brought into contact with the contact pads of the LED circuit board. A connecting conductor is inserted into the housing from the outside and held in a clamping section. At the same time, the ring element has receptacles for fastening elements, such as screw bolts, so that it can be attached to the heat sink. The ring-shaped frame of this connection element thus not only ensures secure and solder-free electrical contact with the LED, but also simultaneously secures it to the heat sink.

[0003] LED technology has evolved significantly over time. COBs with a multitude of different LED chips on a carrier board are now commonly used. They have a shallow installation depth and are manufactured in a wide range of brightness, size, and shape. However, the task of securely electrically contacting the LED board and simultaneously holding it securely on the heat sink remains.

[0004] DE 20 2023 105 716 U1 by the applicant shows a further development of a generic connection element in which the said ring element is divided into two parts and consists of a first ring as the outer ring and a second ring as the inner ring. The outer ring assumes the task of holding the LED circuit board laterally on the heat sink, while the inner ring is inserted concentrically into the outer ring, partially overlapping the LED circuit board and thus securing it.

[0005] This not only facilitates the assembly of a lighting unit, but also the pre-assembly, the stocking of partially assembled units consisting of a heat sink and first ring, and even the subsequent replacement of LED boards.

[0006] At the same time, the market demands the flattest possible design of the connection elements, as excessive application can partially shade the LEDs. This reduces the light output, but more importantly, also the preset beam angle. The flatter the design, the closer a reflector can be positioned to the LEDs. Nevertheless, secure installation of the circuit board is still required. It must remain precisely positioned to guarantee its full performance. It must be held securely, yet still allow for easy replacement while installed.

[0007] It is therefore an object of the invention to provide further secure fastening options for an LED board in a connection element of the above-mentioned type, which take the above-mentioned challenges into account.

[0008] The object is achieved by a connecting element having the features of claim 1, in particular a connecting element in which the frame is divided into a first ring and a second ring, the first ring being provided as the outer ring to surround the circuit board and to hold it parallel to the arrangement surface of the heat sink, the second ring being provided as the inner ring being coaxially seated in the outer ring, overlapping the circuit board at least in some areas, and being provided to hold the circuit board vertically relative to the arrangement surface of the heat sink, in which the connecting element has a fastening part, the fastening part being seated in a receptacle in the outer ring, the inner ring having a counter-bearing for the fastening part, and the fastening part engaging in the counter-bearing substantially parallel to the arrangement surface of the heat sink in the radial direction and securing the inner ring in the outer ring, wherein the fastening part comprises a pivoting lug,which fixes the inner ring in the outer ring.,

[0009] According to the invention, the fastening part exerts a substantially radial force on the inner ring, thereby supporting itself on the outer ring. Overall, the outer ring, fastening part, and inner ring interact to secure each other in a plane that is parallel to the circuit board or parallel to the assembly plane or the surface of the heat sink. This is particularly advantageous because neither the inner ring nor the fastening part is higher than the outer ring. This is of great importance in COB technology, since a flat design of the connection elements improves the light output.

[0010] According to the invention, it is advantageous if the connecting element has two pivoting lugs arranged diametrically opposite one another, which secure the inner ring in the outer ring. The two fastening elements exert their essentially radial forces against each other, thus securely holding the inner ring between them.

[0011] The preferred embodiment of the invention provides that the fastening part comprises a pivoting lug that secures the inner ring in the outer ring. In this embodiment, the invention also stipulates that the fastening part, in this case the pivoting lug, engages a counter-bearing parallel to the mounting surface of the heat sink.

[0012] The fastening principle of this embodiment of the invention is based on a swivel plate seated in the outer ring. The swivel axis around which the swivel plate can rotate is oriented vertically and thus parallel to the installation direction. The swivel plate comprises an elongated section, the swivel lug, which can be rotated out of its rest position in the outer ring to secure the inner ring. This section can be wedge-shaped or tongue-shaped, for example.

[0013] According to the invention, the pivoting lug engages a counterbearing on the inner ring of the connecting element, which is formed as a radial retaining projection or retaining lug, which the pivoting lug engages to secure the inner ring. Preferably, the retaining projection protrudes beyond the otherwise circular contour of the inner ring and provides a surface aligned parallel to the pivoting plane, which engages the pivoting lug with its underside.

[0014] The positive connection between the surface of the retaining projection and the underside of the pivoting lug results in the inner ring being secured to the outer ring by the pivoting lug. According to the invention, it is also conceivable for the pivoting lug to engage a counterbearing that is closed toward the light exit side, for example, a groove in the outer circumference of the inner ring.

[0015] In this embodiment, the outer ring of the connecting element preferably forms a housing for the pivoting lug, in which the pivoting lug is seated by means of a pin perpendicular to the mounting surface, and about whose longitudinal axis it can be pivoted out of the housing onto the retaining projection. The housing is open toward the inner ring to allow the pivoting lug to emerge.

[0016] It is particularly advantageous if the pivoting lug has a receiving profile for a release tool. Using the release tool, the pivoting lug can be released from the friction surface pairing and pivoted back into the housing in the outer ring. The inner ring is then free and can be removed from the outer ring, for example, to replace the circuit board.

[0017] Additionally, the outer ring can form a contoured cutout in the area of the pivoting nose for inserting the associated retaining projections. The contoured cutout preferably corresponds exactly to the outer contour of the inner ring in the area of the retaining projections.

[0018] A further preferred embodiment of the invention provides that the connection element, in which the frame is divided into a first ring and a second ring, the first ring is provided as an outer ring to surround the circuit board and to hold it parallel to the arrangement surface of the heat sink, the second ring as an inner ring is seated coaxially in the outer ring, overlaps the circuit board at least in some areas, and is provided to hold the circuit board vertically to the arrangement surface of the heat sink, in which the connection element has a fastening part, the fastening part is seated in a receptacle in the outer ring, the inner ring has a counter bearing for the fastening part, and the fastening part engages in the counter bearing substantially parallel to the arrangement surface of the heat sink in the radial direction and fixes the inner ring in the outer ring, wherein the fastening part is a spring clip, with a holding leg,against which the outer wall of the inner ring rests and has two spring arms extending from the retaining leg in the opposite circumferential direction, which engage around the inner ring and fix it in the outer ring.

[0019] The connecting element preferably has two spring clips which are arranged diametrically opposite one another and which fix the inner ring in the outer ring.

[0020] The spring clip is designed so that the outer wall of the inner ring rests directly against the spring clip in a contact area of the retaining leg. The spring arms extending from the retaining leg encircle the outer wall of the inner ring and hold the inner ring firmly in the outer ring with spring force.

[0021] Preferably, each spring arm has a retaining lug at its free end pointing toward the inner ring. The inner ring is provided with wall cutouts, and each retaining lug engages over a retaining surface in the wall cutout, exerting an additional retaining force on the inner ring in the direction of the mounting surface.

[0022] Each spring clip has a total of two retaining lugs, both aligned parallel to each other, acting on the inner ring. These lugs transfer the radial force of the spring clip to the inner ring, while also providing a vertical fixation in the installation direction. The printed circuit board, positioned in its insertion contour, is thus securely held in place between the inner and outer rings.

[0023] In a preferred embodiment of the invention, the spring arms each additionally have a support section at their free end, which is perpendicular to the retaining leg. The support sections of a spring clip sit on the base of the outer ring and engage around the two corresponding retaining projections of the inner ring.

[0024] As a leaf spring of small size and material thickness, the spring clip is subject to strong forces in the connecting element. It can therefore tend to twist, for example, when inserting the inner ring. This torsion can be avoided if the spring arms can rest laterally on the base of the outer ring using the support sections. At the same time, they provide additional stability by gripping the inserted inner ring from the outside using the retaining projections and holding it between them.

[0025] In this embodiment of the invention, it is particularly advantageous if the receptacle for the spring clip is designed in the form of a trough in the base of the outer ring. By forming a recess in a part of the outer ring as a trough or receptacle, the spring clip sits particularly securely in the outer ring.

[0026] The support sections then sit on the bottom of the tub and hold the spring clip in position.

[0027] In addition, the overall height of the spring clip can be maximized. This allows, for example, the use of wide spring arms, which exert even greater holding force relative to the inner ring.

[0028] Furthermore, with this design it is conceivable that tolerances in the height of the inner ring or spring clip can be better compensated, since clearance is provided in the installation direction.

[0029] It is also advantageous if the spring clip forms a body extension extending from the contact area, the surface of which serves as a support for a positioning means with which the connecting element can be attached to the heat sink. The body extension has an opening that is congruent with a bore in the outer ring to guide the positioning means through.

[0030] The body extension preferably extends opposite the spring arms to the outer edge of the outer ring. The outer ring is preferably cut out accordingly at this point and forms a recess for the insertion of the body extension. Since the spring clip is preferably made of metal, the body extension forms a robust support for an locating device, such as a screw, with which the connecting element is attached to the heat sink. A metal surface as a support for the screw head offers major advantages over plastic, as metal can withstand pressure better and is also more likely to tolerate deformation. The recess is selected so that the tightened screw head does not protrude beyond the top side of the outer ring.

[0031] Another special advantage is that the outer ring and spring clip can be pre-assembled together on the heat sink. The spring clip is then attached to the outer ring near the fuselage extension, allowing the LED board and inner ring to be inserted in a second assembly step.

[0032] A third embodiment of the invention provides that the fastening part comprises a spring-loaded locking element that secures the inner ring in the outer ring. The force distribution is particularly advantageous here. The holding force of the fastening part acts radially and thus parallel to the arrangement plane on the heat sink. The connection element can be reduced accordingly in height, and the fastening element does not add bulk.

[0033] According to a preferred embodiment, the outer ring forms the receptacle for the spring-loaded locking element in the form of a housing open toward the inner ring, in which the locking element is seated for radial movement. The arrangement of the housing in the annular collar of the outer ring allows the locking element to travel the maximum possible distance toward the inner ring when it is supported against the outer wall of the outer ring. The spring travel in the connecting element is thus maximized, and the spring can exert its maximum force on the locking element.

[0034] According to the invention, the locking element comprises a bolt and a compression spring, with the compression spring being seated in the housing and pressing the bolt radially toward the inner ring. If the spring of the locking element can be supported on the inner outer wall of the outer ring, the spring travel in the connecting element is maximized, and the spring can exert its maximum force on the locking element.

[0035] As a locking counterbearing, the inner ring forms a locking wedge that interacts with the clamping element, with the lower wedge surface serving as the engagement surface. The locking wedge points with its wedge tip toward the outer ring or the locking bolt. When inserting the inner ring into the outer ring, the lower wedge surface of the locking wedge, facing in the installation direction, first comes into contact with the top of the bolt. The inclined surface of the wedge underside guides the bolt back into the housing against the spring tension, allowing the inner ring to slide into its installation position.

[0036] Preferably, the upper wedge surface of the locking wedge serves as the locking surface, which interacts with a catch surface on the underside of the bolt and secures the inner ring within the outer ring. The catch surface and the locking surface form a frictional connection. When two diametrically opposed locking units act against each other, they hold the inner ring particularly securely between them.

[0037] It is advantageous if the locking surface and the catch surface form a pair of inclined surfaces that directs the radially acting forces of the compression spring towards the arrangement surface.

[0038] Overall, any spring element that allows the bolt to be pressed radially toward the inner ring, parallel to the mounting surface of the heat sink, can be used in this embodiment. For example, this compression spring of the clamping element can be a coil spring or a leaf spring.

[0039] Further advantages of the invention and a better understanding of the same can be found in the following description of several exemplary embodiments. They show: figure 1 an embodiment of the invention with the spring clip according to the invention in exploded view, figure 2a perspective view of the Figure 1 shown embodiment in assembled state, figure 3a view of the Figure 1 shown embodiment in assembled state from above, figure 4a sectional view along the Figure 3 shown section line AA acc. Figure 1 in assembled condition, figure 5a partial section along the Figure 3 marked cutting line BB, here in particular to the support element of the spring clip, figure 6 a further embodiment of the invention with the pivoting nose according to the invention as a fastening part in exploded view, figure 7a perspective view of Figure 6shown embodiment in assembled state, figure 8a view of the Figure 6 shown embodiment in assembled state from above, figure 9a sectional view along the Figure 8 shown section line AA acc. Figure 6 in assembled condition, Figure 10 a third embodiment of the invention with the locking element according to the invention, Figure 11 a perspective view of Figure 10 shown embodiment in assembled state, Figure 12 a view of the Figure 10 shown embodiment in assembled state from above, Figure 13 a sectional view along the Figure 12 shown section line AA to the second embodiment according to. Figure 10 in assembled condition, Figure 14 a variant of the third embodiment of the invention with the locking element according to the invention, here leaf spring mounted.

[0040] In the Figures 1 to 5An embodiment of the invention is designated overall by reference number 100. A further embodiment of the invention is shown in the Figures 6 to 9 It is identified overall by the reference number 200. In the Figures 10 to 13 A third embodiment of the invention is presented. This is designated overall by the reference numeral 300. The Figure 14 The variant of the third embodiment presented here is Fig. 14 overall marked with the reference number 400.

[0041] In all figures, the installation direction E is defined as perpendicular to the arrangement plane A on the surface of the heat sink 500 and the light exit direction L is defined as perpendicular away from the arrangement plane A.

[0042] The arrangement plane A as a surface of a heat sink 500, on which all embodiments of the invention can be mounted, is valid for all embodiments, but only by way of example in the Figures 10 to 14marked.

[0043] For all figures it also applies that in the light exit direction L a system axis S runs through the center of the arrangement of outer and inner rings 110 / 130, 210 / 230, 310 / 330, 410 / 430.

[0044] The Figure 1 shows an embodiment of the invention with a connecting element, designated overall by reference numeral 100, in an exploded view. The connecting element 100 comprises a substantially annular frame 105 consisting of a first ring 110 and a second ring 130. The first ring is also referred to as the outer ring 110, and the second ring as the inner ring 130.

[0045] Outer ring 110 and inner ring 130 hold an LED board or printed circuit board 150 with an LED 151 and the corresponding contact fields 152 for an electrical connection between them.

[0046] The annular frame 105 of the connecting element 100 accommodates contact elements (not shown in detail) which interact with the contact fields 152 and enable electrical contact with the LED 151.

[0047] The connection element 100 further comprises two fastening parts in the form of two spring clips 170, which secure the inner ring 130 in the outer ring 110. By means of the screw bolts 190, the connection element 100 or the outer ring 110 is fastened to the mounting surface of a heat sink 500 (not shown), so that the circuit board 150 with the LED 151 is held between the connection element 100 and the heat sink 500.

[0048] For the arrangement level A of a connection element 100 according to the invention on a heat sink 500, reference is made to the Figures 10 to 14 in which the heat sink 500 which can also be used for this embodiment 100 is shown accordingly.

[0049] Of course, it is also conceivable according to the invention that the connection element 100 is fastened on the arrangement plane of any other counter bearing instead of the heat sink 500.

[0050] The outer ring 110 has a bottom side 111 and a top side 112. The bottom side 111 is placed on the surface of the heat sink 500 for assembly in the installation direction E. The top side 112 faces the light exit direction L.

[0051] The outer ring 110 initially has a cutout 114 on its base plate 113. The cutout 114 is cut such that it can be divided into a substantially square insertion contour 115 and further engagement contours 116. These merge into one another. The insertion contour 115 serves to accommodate the printed circuit board 150. The engagement contours 116 enable the printed circuit board 150 to be removed from its installed position without causing damage.

[0052] The base plate 113 further has two opposing, trough-like recesses 117. Each of these recesses 117 has a substantially arched contour. The recess 117 is complemented by a cutout 118 in the outer ring 110. Cutout 118 and recess 117 merge into one another and form a receiving trough 119. The spring clip 170 is inserted into this receiving trough 119 during assembly.

[0053] The spring clip 170 consists of a punched metal sheet with various extensions, each of which fulfills a specific function. First, the spring clip has a body extension 171, which serves as a mounting base and has a bore 172 for the passage of a mounting device, in this case the screw bolt 190.

[0054] The borehole opening 172 is advantageously congruent with a bore 120 in the cutout 118 of the outer ring 110. The screw bolt 190 can be guided through both openings 172, 120 simultaneously. The outer ring 110 and spring clip 170 can thus be fastened simultaneously to the arrangement plane A, the surface of the heat sink 500. This simplifies pre-assembly. This partially assembled assembly consisting of the heat sink 500, outer ring 110, and fastening part 170 can also be stored in this way.

[0055] The trunk extension or the fastening base 171 is aligned parallel to the arrangement plane A or to the base plate 113. A retaining leg 173 is arranged on this fastening base 171. The punched metal sheet of the spring clip 170 is bent at this point by 90° in the light exit direction L. The retaining leg 173 is therefore perpendicular to the arrangement plane A and forms the contact surface 174 against which the outer wall 136 of the inner ring 130 rests during assembly.

[0056] The metal sheet is not simply bent at a right angle in the transition area between the mounting base 171 and the retaining leg 173, but forms a spring bend 175 at the bend angle. This provides, on the one hand, sufficient distance between the borehole 172 and the retaining leg 173 for supporting a screw bolt head 191. On the other hand, the spring bend 175 enables an additional radial spring force of the retaining leg 173 toward the outer wall 136 of the inner ring 130.

[0057] Starting from the retaining leg 173, a spring arm 176 extends in both directions at the circumferential height of the inner ring 130. Each spring arm 176 is deflected radially in the direction of the inner ring 130. The spring arms 176 spring about an axis that runs perpendicularly through the retaining leg 173 parallel to the installation direction E. They exert a spring force acting parallel to the arrangement plane A on the outer wall 136 of the inner ring 130. Since in each connecting element 100 according to this embodiment, two spring clamps 170 are located diametrically opposite one another, the spring forces of the spring arms 176 always act against one another and thus clamp the inner ring 130 firmly in the outer ring 110 between them.

[0058] At their free end, the spring arms 176 each have a retaining lug 177. The retaining lug 177 overlaps the inner ring 130, which will be described here first.

[0059] The inner ring 130 also has a bottom side 131 and a top side 132. The bottom side 131 of the inner ring 130 is oriented in the installation direction E toward the base plate 113 of the outer ring 110 and overlaps the printed circuit board 150.

[0060] Both the outer and inner rings 110 / 130 can, according to the invention, contain openings or housings for receiving contact elements which are used for the electrical contacting of the LED 151, but are not described in detail here.

[0061] The inner ring 130 has an annular opening 133 in its center, the size of which approximately corresponds to the outer circumference of the LED 151, so that the base of the inserted LED 151 is flush with the edge of the opening 133. From its upper side 132, the inner wall 134 of the inner ring 130 extends in a funnel shape toward the annular opening 133. The funnel shape facilitates maintaining the optimal beam angle of the LED 151.

[0062] Wall cutouts 135 are located at four opposite locations. Distributed around the outer circumference of the inner ring 130, the outer wall 136 is cut out four times in a roughly cube-shaped manner. The imaginary cube shape is not completely symmetrical—the bottom of the wall cutouts 135 in the inner ring 130 is cut out in a slight ramp shape—the cutout 135 becomes deeper toward the outside.

[0063] In this way, four retaining ramps 137 are formed. The ramp tip 138—the flattest point of the ramp—is directed toward the outer ring 110, more precisely, toward the spring arms 176 of the spring clamp 170.

[0064] The retaining lug 177, formed from a bent extension of the spring arm 176, overlaps the retaining ramp 137 in the assembled state. The tip 178 of the retaining lug 177 exerts a compressive force in the direction of the opposite tip 178 of the opposite retaining lug 177.

[0065] The underside 179 of the retaining lug 177 rests on the surface 139 of the retaining ramp 137. Thus, a supplementary pressure force oriented perpendicular to the arrangement plane A is exerted on the inserted inner ring 130, which additionally holds the inner ring 130 in the outer ring 110 in the assembled state.

[0066] Furthermore, the lateral inner surfaces 180 of the retaining lugs 177 can rest against the vertical cutout walls 140 of the wall cutouts 135. Here, too, an additional holding force can be exerted on the section of the inner ring 130 located between the wall cutouts 135.

[0067] The wall cutouts 135 thus serve as a counter bearing for the spring clamp 170.

[0068] Figure 2 shows the embodiment of the connecting element 100 according to the invention in the assembled state in a perspective view from above. Figure 1The components described in individual parts, outer ring 110 and inner ring 130, are assembled here, hold the circuit board 150 between them and a not shown arrangement surface A of a heat sink 500, wherein the spring clip 170 fastens and securely holds the inner ring 130 in the outer ring 110.

[0069] For assembly, the inner ring 130 is placed from above in the installation direction E onto the outer ring 110, which is already pre-assembled on the arrangement plane A of the heat sink 500 and also already carries the spring clips 170. These are advantageously fastened using the same screw bolts 190 that are also used for assembly on the heat sink 500.

[0070] The inner ring 130 is placed from above onto the retaining lugs 177 of the spring clips 170 in installation direction E and clipped in by manual pressure in installation direction E without any additional tools. The retaining lugs 177 spring back and slide, guided by the spring force, over the retaining ramps 137 back into their fastening position.

[0071] In the installed state, it is clear that the spring clip 170 sits in the receiving trough 119 formed by the recess 117 and the cutout 118 and does not protrude from the overall height of the outer ring 110.

[0072] The body extension 171 of the spring clip 170, with its fastening base 171 aligned parallel to the arrangement plane A, forms a stable counter-bearing for the underside 192 of a screw bolt head 191. In comparison to the otherwise plastic surfaces 112, 132 of the connecting element 100, the metal support is shatter-proof and, if necessary, flexible, so that the connecting element 100 can be securely and firmly fastened to the surface of the heat sink 500 with the screw bolt 190.

[0073] At the same time, the trunk extension 171 with the curved transition in the form of a spring arch 175 offers a stable hold for the holding leg 173. This is slightly spring-mounted on the trunk extension 171 via the spring arch 175 and can thus successfully support the inner ring 130, while the spring arms 176 engage around the outer wall 136 of the inner ring 130 and hold it between the holding lugs 177 arranged at the free ends.

[0074] Figure 3shows the connecting element of embodiment 100 according to the invention in a top view. The shape of the spring clip 170, which serves as a fastening element between the outer ring 110 and the inner ring 130, is clearly visible. First, the body extension 171 of the two spring clips 170 can be seen on both sides, on whose metal surface the screw head 191 of the screw bolt 190 rests. From above, it is visible that the spring arc 175 provides sufficient distance between the screw head 191 and the retaining leg 173. The retaining leg 173 rests with its inner side against the outer wall 136 of the inner ring 130.

[0075] From there, the spring clip 170 forks into two spring arms 176, which engage the inner ring 130. At the free ends of each of the spring arms 176 are the retaining lugs 177, which overlap the cube-shaped cutouts 135 in the inner ring 130. At the very outside, the spring arms 176 additionally form support sections 181, which support the spring clip 170 in the base of the receiving trough 119 of the outer ring 110 when the inner ring 130 is inserted.

[0076] It is also clear that the two opposing spring clips 170 hold the inner ring 130 between them and that the holding forces for fastening the inner ring 130 in the outer ring 110 run essentially parallel to the arrangement plane A of the heat sink 500.

[0077] Figure 4 shows a sectional view along a Figure 3 section line AA. As shown in the Figures 2 and 3Here, too, the inner ring 130 is already secured in the outer ring 110. The support of the screw heads 191 on the body extensions 171 is clearly visible in the cutout 118 on the left side. The section shows that the LED 151 rests on its circuit board 150 in the cutout 114 of the underside 111 of the first ring 110 and rests in a plane on the surface and arrangement plane A of the heat sink 500. The inner ring 130 sits in the outer ring 110 and holds the circuit board 150 firmly beneath it. For final fixation, the spring clips 170 with their locking lugs 177 or retaining lugs are provided, which fix the inner ring 130 at opposite points.

[0078] The sophisticated design of the spring clip 170 is once again demonstrated in the Figure 5This section clearly shows not only the fastening of the spring clip 170 via the body extension 171 in the outer ring 110, the retaining legs 173, and the spring arms 176, but also the support of the retaining lug 177 on the retaining ramp 137 of the inner ring 130 and the lateral support of the spring clip 170 by the support sections 181 bent at right angles toward the inner ring 130.

[0079] The support sections 181 not only provide the spring clamp 170 with more stability - especially when inserting the inner ring 130 - but also encompass the adjacent holding ramps 137 from the outside and thus represent an additional fastening factor.

[0080] Figure 6presents a further embodiment 200 of the invention using an exploded view. In this embodiment 200, the assembly of the connecting element 200 also includes a substantially annular frame 205 consisting of a first ring 210 and a second ring 230, as well as an LED circuit board 250 and a pair of fastening elements 270, which serve to fasten the inner ring 230 in the outer ring 210 and thus secure the inserted circuit board 250.

[0081] The outer ring 210 consists of a substantially circular frame 205 with a bottom side 211, with which it is placed and fastened on the top side or arrangement surface of a heat sink 500.

[0082] For this purpose, the outer ring 210 has two opposing bores 217 through which arrangement elements 290, such as screw bolts in this case, are guided in the installation direction E and secured in the heat sink 500. The bores 217 are advantageously provided in this embodiment such that the bore on the upper side 212 of the outer ring 230 is dimensioned such that the screw head 291 of the screw bolt 290 can be countersunk. It thus does not protrude from the surface of the connecting element 200.

[0083] The outer ring 210 also has an upper side 212 pointing in the light exit direction L. Inside the outer ring 210, a base plate 213 can be seen, which is provided with a cutout 214. This cutout 214 is intended to accommodate the LED circuit board 250 and is shown only schematically. Such a cutout 214 is generally adapted to the dimensions of the LED circuit board 250 and includes an insertion contour 215, shown only schematically, and an engagement contour 216, which allows the LED circuit board 250 to be inserted into the receptacle without damage or to be removed from its receptacle in the base 213 of the outer ring 210.

[0084] The outer ring 210 also has two opposing housings 218, which serve to accommodate the fastening elements 270. The otherwise essentially circular contour of the outer ring 210 is extended around its outer circumference in this area. This contour extension 219 enables the intended movement path of the fastening element 270 without it pivoting out of the outer ring 210.

[0085] The outer ring 210 is also open on its upper side 212 in the area of the housing 218 to allow the insertion of the fastening element 270 in the installation direction E.

[0086] The housing 218 is also provided with an opening 220 to the interior of the outer ring 210. The fastening element 270 pivots out of this opening 220 to secure the inner ring 230.

[0087] The inner ring 230 also has a bottom side 231 and a top side 232. The bottom side 231 is oriented in the installation direction E toward the base plate 213 of the outer ring 210 and overlaps the printed circuit board 250.

[0088] According to the invention, both the outer and inner rings 210 / 230 can contain openings or housings for receiving contact elements, which are not shown in detail here.

[0089] The inner ring 230 has an annular opening 233, the size of which approximately corresponds to the outer circumference of the LED 251, so that the base of the inserted LED 251 is flush with the edge of the opening 233. From its upper side 232, the inner wall 234 of the inner ring 230 extends in a funnel shape toward the annular opening 233. The funnel shape facilitates maintaining the optimal beam angle of the LED 251.

[0090] The outer contour of the inner ring 230 is predominantly annular—at two opposite points, the inner ring 230 is widened outward. Here, the inner ring 230 forms retaining projections or retaining lugs 235. The retaining projection 235 is a projection with a roughly bell-shaped contour on the lower edge of the inner ring 230, pointing toward the arrangement surface A. Its overall height is only approximately one-quarter of the outer wall height of the inner ring 230. This projection, also referred to as retaining lug 235, extends toward the outer ring 210.

[0091] The outer ring 210 is cut out at the corresponding locations in its inner circumferential contour to allow seamless insertion of the inner ring 230. After insertion, the retaining lugs 235 rest on the bottom 213 of the outer ring 210, flush with the underside 231 of the inner ring 230. The housings 218 in the outer ring 230 are also arranged in the area of these cutouts, and the fastening parts 270 are located here.

[0092] The eccentric-like fastening parts 270 are shown in the exploded view of the Figure 6also shown. They initially comprise a pin 271, which can be inserted in the installation direction E into a corresponding recess 221 in the housing 218. The fastening part 270 is pivotable about the longitudinal axis running through the pin 271. The fastening part 270 has a pivot plate 272, which has a shorter guide section 273 and a longer fastening section 274, which is also referred to here as a pivot nose 274 or pivot wedge.

[0093] The outer contour of the swivel plate 272 is oval in this embodiment; other contours are also conceivable according to the invention. The oval contour is advantageous because it can only be inserted into the housing 218 in a specific position and can no longer slip laterally after the inner ring 230 has been inserted and locked.

[0094] The fastening part 270 has a receiving profile 275 on its upper side facing in the light exit direction L, into which an unlocking tool can engage. A simple slotted profile 275, for example, for a screwdriver, is shown. Other profiles are also conceivable according to the invention.

[0095] With the release tool, the pivoting movement of the pivoting lug 274 can be easily performed in a horizontal direction, parallel to the arrangement plane A. The pivoting lug 274, which still points in the circumferential direction of the outer ring 210 after the fastening part 270 has been inserted into the housing 218 in the outer ring 210, is rotated out of the housing 218 toward the inner ring 230. It then engages the inner ring 230 in the area of the retaining lugs 235 and secures it in its installed position in the outer ring 210.

[0096] Figure 7shows the embodiment of the invention in assembled form. The perspective view shows that the inner ring 230 sits within the outer ring 210 and overlaps the circuit board 250. The LED 251 sits in the opening 233 of the inner ring 230 and can optimally radiate its light via the funnel-shaped inner wall 234. The connection element 200 is fastened to the mounting surface A of a heat sink 500 by two screws 290 that pass through the annular collar of the outer ring 210. The heat sink 500 is not shown here. The two fastening elements 270, which are also arranged opposite one another, are seated in their respective housings 218; the pivoting lug 274 has already pivoted out of the opening 220 and overlaps the respective retaining projection 235 of the inner ring 230.

[0097] Figure 8shows the embodiment of the invention in a top view. The contour cutouts 219 on the inner circumference of the outer ring 210 are clearly visible here again. It is also clearly visible that the outer contour of the outer ring 210 in the area of the housing 218 also deviates from the normal circular contour and protrudes slightly outward. The housing shape is selected so that the fastening element 270 can be rotated within the housing 218 from its rest position into the fastening position without protruding outward beyond the outer ring 210.

[0098] Figure 9 shows the fastening position once in the sectional view along the Figure 8drawn section line AA. The fastening element 270 is seated in its housing 218. The pivot pin 271 is rotatably seated in its recess 221. The pivot lug 274 has already been pivoted into the fastening position and overlaps the retaining lug 235. A surface pairing is created between the underside of the pivot lug 276 pointing in the installation direction E and the surface of the retaining projection 235 of the inner ring 230 pointing in the light exit direction L. The inner ring 230 is thus securely fixed in the outer ring 210. The inner ring 230 overlaps the printed circuit board 250 and secures it firmly in its position in the connection element 200. The pressure force of the pivot lugs 276 is transferred to the printed circuit board 250. Using a corresponding release tool, the fastening part 270 can be rotated back from its fastening position to the rest position, so that the inner ring 230 is released and can be removed from the outer ring 210.

[0099] Figure 10provides an overview of the third embodiment of the invention, in which a spring-loaded locking element 370 serves for fastening. The assembly 300 consists, as in the other embodiments 100, 200, of a substantially annular frame 305 consisting of an outer ring 310 and an inner ring 330, a circuit board 350, and a pair of fastening elements 370, which serve to fasten the inner ring 330 in the outer ring 310 and thus secure the inserted circuit board 350.

[0100] The outer ring 310 consists of a substantially circular frame, also referred to as an annular collar, with a bottom side 311, with which it is placed and secured on the top side, or arrangement surface A, of a heat sink 500. For this purpose, reference is also made to the sectional view in Figure 13 and the perspective representation in Figure 11The outer ring 310 has bores for screw bolts or other equivalent locating elements 390 in the installation direction E. However, it is also provided for this embodiment that the locating elements, such as screw bolts 390, are recessed into the outer ring 310 in such a way that they do not protrude from the upper side 312 of the connecting element 300. Figure 11 illustrates this in perspective view.

[0101] The outer ring 310 also has an upper side 312 pointing in the light exit direction L. The base plate 313 is - as in the other two embodiments - provided with a cutout 314, which is intended to receive the LED board 350 and in Figure 10 is only shown schematically.

[0102] Such a cutout 314 is basically adapted to the dimensions of the LED board 350 and comprises an insertion contour 315, shown only schematically, and an engagement contour 316, which makes it possible to insert the LED board 350 into the receptacle without damage or to remove it from its receptacle in the base 313 of the outer ring 310.

[0103] The annular collar of the outer ring 310, or rather its outer wall 317, is extended outwards in a box-like manner at two points. This is particularly clearly visible in the top view in Fig. 12can be seen. The housings 318 for the spring-loaded locking elements 370 are housed in these extensions. The radial extension is necessary here to provide the spring travel for the spring-loaded locking elements 370. The outer ring 310 has openings 320 on its inner wall 319 in the area of the housings 318. In this embodiment, the housings 318 are closed all around and open only at the inner wall 319 toward the interior of the outer ring 310.

[0104] In the area of the opening 320, the base plate 313 of the outer ring 310 has a step or abutting edge 321. This serves to prevent the locking element 370, which is movably mounted in the housing 318, from being pushed completely out of the housing 318.

[0105] Finally, the inner side 319 of the outer ring 310 is slightly cut out in its contour in the area of the housing, so that a slight recess 322 in the inner contour results, which merges into the opening 320. The course of the contour line is particularly in the top view in Figure 12 recognizable.

[0106] The housings 318 are arranged opposite one another. The fastening elements 370 are mounted in them. These consist of a bolt 371 and a compression spring 372. In the Fig. 10 In the embodiment shown, the bolt 371 is shown as a substantially cuboid-shaped element which is connected to the compression spring 372 at its end 373 facing the outer ring 310 and has a locking device 374 at its other end.

[0107] The compression spring 372, which is Fig. 10As shown, it is a helical compression spring. It is attached with one coil end to or in the bolt 371. The other free end 375 of the compression spring is directed toward the outer wall 317 of the outer ring. It rests against the inner wall of the housing 318. The spring 372 thus always presses the bolt 371 toward the inner ring 330.

[0108] The bolt 371 has a locking device 374 that is locked to the counterbearing of the inner ring 330. The most important surfaces of the locking device 374 are the inclined catch surface 376 and the retaining surface 377, which point toward the base plate 313 of the outer ring 310 in the installation direction.

[0109] If no inner ring 330 is initially inserted, the spring-loaded locking element 370 with the compression spring 371 is seated in the housing 318, the bolt 371 projects in the fastening direction or in the direction of the interior of the outer ring 310. The spring 372 presses it against the abutment edge 321 provided in the bottom 313 of the outer ring 310, against which it runs with its holding surface 377 provided on the underside.

[0110] The inner ring 330, like the inner rings 130, 230 of the other embodiments, has a bottom side 331 and a top side 332. The bottom side 331 is aligned in the installation direction E with the base plate 313 of the outer ring 310 and overlaps the circuit board 350 with its LED 351 and the contact pads 352.

[0111] In this embodiment 300, housings for contact elements can also be accommodated in the inner ring 330 or the outer ring 310 according to the invention. They are not shown in detail here.

[0112] This inner ring 330 also has an annular opening 333 into which the LED 351 fits snugly. The inner wall 334 is also funnel-shaped for the optimal beam angle.

[0113] The inner ring 330 has locking wedges 335 at two opposite locations. The outer wall 336 of the inner ring 330 is wedge-shaped here; the wedge tip 337 points toward the outer ring 310. The outer wall 336 of the inner ring 330 forms the respective wedge. Fitting walls 338 are perpendicular to the circumference and border the outer circumference on the left and right, extending to the wedge tip 337.

[0114] For assembly, the inner ring 330 is inserted vertically into the interior of the outer ring 310. The fitting walls 338 serve as guide elements. The sectional view of the Figure 13illustrates the surfaces that interact during installation. First, the lower wedge surface 339, facing the underside 331 of the inner ring, strikes the locking bolt 371. This lower wedge surface acts as an engagement surface 339 and pushes the bolt 371 outwards into the housing 318 against the spring force of the compression spring 372. Once the bolt 371 has been fully retracted, the bolt front 378 slides over the wedge tip 337. Now the inclined surface 340 of the bolt 371, facing the bottom 313 of the outer ring 310 - also referred to as the locking surface 340 - engages the upper catch surface 376 of the locking wedge 335 on the inner ring 330, facing in the light exit direction L. Catch surface 376 and locking surface 340 form a pair of inclined surfaces.

[0115] The inclined surface pairing results in the compressive forces of spring 372, which act radially in the fastening direction B, being redirected into a holding force acting in the installation direction E. The inner ring 330 is held in the outer ring 310. The circuit board 350 is held between the inner ring 330 and the outer ring 310.

[0116] For the sake of completeness, an embodiment 400, which is almost identical to the embodiment 300 in terms of its fastening principle, is shown in Figure 14 The already existing Figures 10 to 13 The components explained above are also present here, only the fastening part 470 does not have a spiral compression spring, but a leaf spring 472.

[0117] An annular frame 405 is provided, consisting of an outer ring 410 and an inner ring 430. Furthermore, a printed circuit board 450 with an LED 451 and contact pads 452 is also seated in a cutout 414 in the base 413 of the outer ring 410. It is covered by the inner ring 430.

[0118] The inner wall 419 of the outer ring 410 again has openings 420, identical to the embodiment 300, through which the bolt 471 fastened to the leaf spring 472 can slide in order to fasten the connecting element 400 with the LED board 450 on the heat sink 500.

[0119] Here, too, two housings 418 are located in the outer ring 410, arranged opposite one another. The housings 418 serve to accommodate the leaf spring 472 and are adapted to its contour. The housings 418 are formed by a cutout in the outer wall 417 of the outer ring 410, allowing the leaf springs 472 to be inserted in the installation direction.

[0120] The housing 418 forms grooves 423 along the circumferential line of the outer ring 410. The free retaining ends 475 of the leaf spring 472 are seated in these grooves 423. The leaf spring 472 is inserted into the housing 418 under tension; the retaining ends 475 are supported on the inner groove walls 424 facing the outside of the outer ring 410.

[0121] The locking mechanism with the locking wedge 435 is identical to that of embodiment 300. The description also applies to the fastening part 470. List of reference symbols

[0122] 100Connecting element 105Annular frame 110First ring / outer ring 111Bottom 112Top 113Base plate 114Cutout 115Insertion contour 116Engagement contour 117Recess 118Cutout 119Receiving tray 120Borehole 130Second ring / inner ring 131Bottom 132Top 133Annular opening 134Inner wall 135Wall cutout 136Outer wall 137Holding ramp 138Ramp tip 139Surface 140Vertical cutout wall 150PCB 151LED 152Contact panels 170 Spring clip 171 Trunk extension 172 Drill hole opening 173 Retaining leg 174 Contact surface 175 Spring arch 176 Spring arms 177 Retaining nose 178 Retaining nose tip 179 Underside 180 Lateral inner surfaces 181 Support sections 190Screw bolt 191Screw bolt head 192Underside 200Connecting element 205Annular frame 210First ring / outer ring 211Bottom 212Top 213Base plate 214Cutout 215Insertion contour 216Engagement contour 217Bores for screw bolts 218Housing 219Contour extension 220Opening to the inside 221Recess for pin 230Second ring / inner ring 231Bottom 232Top 233Annular opening 234Inner wall 235Retaining lug 236Surface of the retaining lug 250PCB 251LED 252Contact panels 270Fastening part 271Pin 272Swivel disc 273Guide section 274Swivel nose 275Receiving profile 276Underside of the swivel nose 290Screw bolt 291Screw bolt head 292Underside 300Connecting element 305 Annular frame 310 First ring / outer ring 311 Bottom 312 Top 313 Base plate 314 Cutout 315 Insertion contour 316 Engagement contour 317 Outer wall of the outer ring 318 Housing 319 Inner wall of the outer ring 320 Opening to the inside 321 Impact edge 322 Recess 330Second ring / inner ring 331Bottom 332Top 333Annular opening 334Inner wall 335Locking wedge 336Outer wall of the inner ring 337Wedge tip 338Fitting walls 339Indentation surface 340Locking surface 350PCB 351LED 352Contact panels 370 Fastening part 371 Bolt 372 Compression spring 373 Connection point 374 Locking device / locking surface 375 Free end of the compression spring 376 Catch surface 377 Holding surface 378 Bolt front 390Screw bolt 391Screw bolt head 392Underside 400Connecting element 405 Annular frame 410 First ring / outer ring 411 Bottom 412 Top 413 Base plate 414 Cutout 415 Insertion contour 416 Engagement contour 417 Outer wall of the outer ring 418 Housing 419 Inner wall of the outer ring 420 Opening to the inside 421 Impact edge 422 Recess 423 Groove 424 Groove inner wall 430Second ring / inner ring 431Bottom 432Top 433Annular opening 434Inner wall 435Locking wedge 436Outer wall of the inner ring 437Wedge tip 438Fitting walls 439Indentation surface 440Locking surface 450Printed circuit board 451LED 452Contact pads 470Fastener 471Bolt 472Leaf spring 473Connection point 475Free retaining ends of the leaf spring 476Catching surface 477Retaining surface 478Bolt front 490Screw bolt 491Screw bolt head 492Underside 500Heatsink AArrangement level BFassing direction SSystem axis EEnstallation direction LLight exit direction

Claims

1. A connection element (200) for the electrical connection of an LED lamp, wherein the LED lamp has a circuit board (250) provided with contact pads (252) for the electrical supply of the LED (251), - with a substantially annular frame (205) which is provided to overlap the circuit board (250) and to mechanically hold it on an arrangement surface (A) of a heat sink (500), - with a contact arrangement which is mounted in the frame (205) and serves to electrically supply the LED (251), wherein - the frame (205) is divided into a first ring (210) and a second ring (230), - the first ring (210) is provided as an outer ring to surround the circuit board (250) and to hold it parallel to the arrangement surface (A) of the heat sink (500), - the second ring (230) is provided as an inner ring in the outer ring (210) coaxially - the printed circuit board (250) overlaps at least in some areas, and is intended toto hold the circuit board (250) in the vertical direction to the arrangement surface (A) of the heat sink (500), , characterized in that - the connecting element (200) has a fastening part (270), - the fastening part (270) is seated in a receptacle (218) in the outer ring (210), - the inner ring (230) has a counter-bearing (235) for the fastening part (270), and the fastening part (270) engages in the counter-bearing (235) substantially parallel to the arrangement surface (A) of the heat sink (500) and fixes the inner ring (230) in the outer ring (210), wherein the fastening part (270) comprises a pivoting nose (274) which fixes the inner ring (230) in the outer ring (210).

2. Connection element (200) according to claim 1, characterized in that the connecting element (200) has two pivoting lugs (274) which are arranged diametrically opposite one another and which fix the inner ring (230) in the outer ring (210).

3. Connection element (200) according to claim 1 or 2, characterized in thatthe counter bearing on the inner ring (230) is formed as a radial retaining projection (235) which the pivoting nose (274) overlaps to fix the inner ring (230).

4. Connection element (200) according to one of the preceding claims, characterized in that the outer ring (210) forms a housing (218) as a receptacle for the pivoting nose (274), in which the pivoting nose (274) is seated by means of a pin (271) perpendicular to the arrangement surface (A) and about whose longitudinal axis it can be pivoted out of the housing (218) onto the holding projection (235).

5. Connection element (200) according to one of the preceding claims, characterized in that the pivoting nose (274) has a receiving profile (275) for an unlocking tool.

6. Connection element (200) according to one of the preceding claims, characterized in that the outer ring (210) forms a contour cutout (219) in the area of ​​the pivoting lugs (274) for inserting the associated retaining projection (235).

7. A connection element (100) for the electrical connection of an LED light source, wherein the LED light source has a circuit board (150) which is provided with contact pads (152) for the electrical supply of the LED (151), - with a substantially annular frame (105) which is provided to overlap the circuit board (150) and to mechanically hold it on an arrangement surface (A) of a heat sink (500), - with a contact arrangement which is mounted in the frame (105) and serves to electrically supply the LED (151), wherein - the frame (105) is divided into a first ring (110) and a second ring (130), - the first ring (110) is provided as an outer ring to surround the circuit board (150) and to hold it parallel to the arrangement surface (A) of the heat sink (500), - the second ring (130) is provided as an inner ring in the outer ring (110) coaxially - the printed circuit board (150) overlaps at least in some areas, and is intended toto hold the circuit board (150) in the vertical direction to the arrangement surface (A) of the heat sink (500), , characterized in that - the connecting element (100) has a fastening part (170), - the fastening part (170) is seated in a receptacle (119) in the outer ring (110), - the inner ring (130) has a counter-bearing (135) for the fastening part (170), and the fastening part (170) engages in the counter-bearing (135) essentially parallel to the arrangement surface (A) of the heat sink (500) and fixes the inner ring (130) in the outer ring (110), wherein the fastening part is a spring clip (170) with a holding leg (173) against which the outer wall (136) of the inner ring (130) rests and has two spring arms (176) extending from the holding leg (173) in opposite directions in the circumferential direction, which engage around the inner ring (130) and fix it in the outer ring (110).

8. Connection element (100) according to claim 7, characterized in thatthe connecting element (100) has two spring clips (170) which are arranged diametrically opposite one another and which fix the inner ring (130) in the outer ring (110).

9. Connection element (100) according to claim 7 or 8, characterized in that each spring arm (176) has at its free end a retaining lug (177) pointing towards the inner ring (130), the inner ring (130) is provided with wall cutouts (135) and each retaining lug (177) engages over a retaining surface (137) in the wall cutout (135) and thus exerts an additional retaining force on the inner ring (130) acting in the direction of the arrangement surface (A).

10. Connection element (100) according to claim 9, characterized in thatthe spring arms (176) each have a support section (181) at their free end, which is perpendicular to the holding leg (173), wherein the support sections (181) sit on the bottom (113) of the outer ring (110) and the support sections (181) of a spring clip (170) engage around the two corresponding wall cutouts (135) of the inner ring (130).

11. Connection element (100) according to one of claims 7 to 10, characterized in that the receptacle for the spring clip (170) is designed as a trough (119) in the bottom (113) of the outer ring (110).

12. Connection element (100) according to one of claims 7 to 11, characterized in thatthe spring clip (170) forms a body extension (171) starting from the holding leg (173), the surface of which serves as a support for an arranging means (190) with which the connecting element (100) can be fastened to the heat sink (500), wherein the body extension (171) has an opening (172) which is arranged congruent with a bore (120) in the outer ring (110) in order to guide the arranging means (190) through.

13. Connection element (300, 400) for the electrical connection of an LED light source, wherein the LED light source has a printed circuit board (350, 450) which is provided with contact fields (352, 452) for the electrical supply of the LED (351, 451), - with a substantially annular frame (305, 405) which is provided to overlap the printed circuit board (350, 450) and to hold it mechanically on an arrangement surface (A) of a heat sink (500), - with a contact arrangement which is mounted in the frame (305, 405) and serves to supply the electrical supply to the LED (351, 451), wherein - the frame (305, 405) is divided into a first ring (310, 410) and a second ring (330, 430), - the first ring (310, 410) as Outer ring is provided to surround the circuit board (350, 450) and to hold it parallel to the arrangement surface (A) of the heat sink (500), - the second ring (330, 430) is seated coaxially as an inner ring in the outer ring (310, 430), - the circuit board (350,450) at least partially overlapped, and is intended to hold the circuit board (350, 450) in the vertical direction to the arrangement surface (A) of the heat sink (500), , characterized in that - the connecting element (300, 400) has a fastening part (370, 470), - the fastening part (370, 470) is seated in a receptacle (318, 418) in the outer ring (310, 410), - the inner ring (330, 430) has a counter-bearing (335, 435) for the fastening part (370, 470), and - the fastening part (370, 470) engages in the counter-bearing (335, 435) essentially parallel to the arrangement surface (A) of the heat sink (500) and fixes the inner ring (330, 430) in the outer ring (310, 410), wherein - the fastening part (370, 470) comprises a spring-loaded locking element (370, 470) which locks the inner ring (330, 430) in the outer ring (310, 410).

14. Connection element (300, 400) according to claim 13, characterized in thatthe connecting element (300, 400) has two spring-loaded locking elements (370, 470) which are arranged diametrically opposite one another and which fix the inner ring (330, 430) in the outer ring (310, 410).

15. Connection element (300, 400) according to claim 13 or 14, characterized in that the outer ring (310, 410) forms the receptacle for the spring-loaded locking element (370, 470) in the form of a housing (318, 418) open towards the inner ring (330, 430), in which the locking element (370, 470) is seated in a radially movable manner.

16. Connection element (300, 400) according to one of claims 13 to 15, characterized in that the locking element (370, 470) comprises a bolt (371, 471) and a compression spring (372, 472), wherein the compression spring (372, 472) is seated in the housing (318, 418) and presses the bolt (371, 471) in the radial direction towards the inner ring (330, 430).

17. Connection element (300, 400) according to one of claims 13 to 16, characterized in thatthe inner ring (330, 430) forms a locking wedge (335, 435) which cooperates with the bolt (371, 471), the lower wedge surface (339, 439) serving as an engagement surface.

18. Connection element (300, 400) according to claim 17, characterized in that the upper wedge surface (340, 440) of the locking wedge (335, 435) serves as a locking surface which cooperates with a catching surface (376, 476) on the underside of the bolt (371, 471) and fixes the inner ring (330, 430) in the outer ring (310, 410).

19. Connection element (300, 400) according to claim 18, characterized in that the locking surface (340, 440) and the catching surface (376, 476) form a pair of inclined surfaces which deflect the radially acting forces of the compression spring (372, 472) in the direction of the arrangement surface (A).

20. Connection element (300, 400) according to one of claims 13 to 19, characterized in that the compression spring (372, 472) of the spring-loaded locking element (370, 470) is a helical spring (372) or a leaf spring (472).

Images