DE102013011713A1 - fastener - Google Patents

Abstract

Shown and described is a fastening means (210) with an expandable shaft (212); with a shaft end (216) disposed on a shaft end, wherein the shaft head (216) is widened in diameter relative to the shaft (212), with a spreading means with the aid of which the shaft (212) can be elastically stretched back, wherein the fastening means (210) for arranging two components (233), (234) together, in particular for arranging an LED-provided printed circuit board (235) on the holder serving a heat dissipating lamp component (236) by the shaft (212) through an opening 238) of a the shaft member (216) for at least indirect support on the first component (233) is provided and by the shaft (212) in a recess (239) of a second component (234) can be arranged and by the shaft (212) after its spreading at least frictionally engaged in the recess (239) of the second component (234) is anchored, wherein the fastening means (210) with a clamping element (240) is provided, which over the shaft head (216), the first component (233) against the second component (234) biases.

Description

The invention relates to a fastening means with an expandable shaft, with a shaft end disposed on a shaft head, wherein the shaft head is widened with respect to the shaft in the diameter, with a spreading means, by means of which the shaft is resiliently spreadable, wherein the fastening means for the arrangement of two components together is provided, in particular for the arrangement of an LED provided with a printed circuit board on a heat-dissipating lighting component by the shaft through an opening of a first component hindurchführbar and the shaft head is provided for at least indirect support on the first component and by the shaft in a recess of a second component can be arranged and by the shaft after its spread at least frictionally anchored in the recess of the second component.

Generic fasteners are not known to the applicant from the prior art of lighting technology.

However, there are similar fasteners in the automotive industry, which are referred to there as Spreizniet. Thus, a similar fastener example, from the non-generic WO 2005/071273 A1 known. This expansion rivet is usually used in the automotive industry to define interior trim parts on the body.

In lighting technology LEDs are increasingly used as a light source. LEDs are usually arranged on a board, which usually has a good heat conduction. On the top of the board there are traces to electrically connect the LEDs. These tracks must be spaced or insulated from metal parts. These boards are mounted on a counter-bearing, which is for example designed as a heat sink and is a lighting component or part of the lamp housing itself. When mounting the board on the lamp component, the correctly selected system pressure is of great importance, since this is a decisive factor for the quality of the heat dissipation from the LED to the lamp component.

A fastener, which sets individual provided with LEDs boards on a lamp component is, for example, from DE 10 2008 005 823 A1 known. Here, an annular connection element is placed on the board and supports the board between itself and an abutment, such as a heat sink. About screws, this connection element is connected to the counter bearing. The tightening torque of the screws defines the pressure force between the PCB and the counter bearing.

The increasing mass production of LED lights of various kinds requires fasteners for the LEDs provided with boards, which can be used in automated manufacturing processes. This means that it is a mechanical processing and / or a fast, clearly secure manual assembly to ensure. In this case, high demands are placed on the permanent mounting of the board and permanent maintenance of the system pressure on such fasteners, which is due to the predicted lifetime of up to 50,000 hours of an LED light source.

It is an object of the invention to provide a suitable for the automated production of luminaires fastener, which ensures a defined contact pressure between the LED and the lamp component.

The object of the invention is achieved by a fastening element with the features of claim 1, in particular with its characterizing features, according to which the fastening means is provided with a clamping element which spans the first component against the second component via the shaft head.

The main advantage of the fastener according to the invention is initially in its suitability for automated assembly. Two components - the first component corresponds to the board with LED, the second component corresponds to the luminaire component - are arranged with opening and recess aligned with each other. The shank of the fastener is passed through the opening and inserted into the recess until the shaft head rests on the first component. After the spreading of the shaft, the fastening means is fixed in the recess of the second component, so that the components are arranged firmly on each other.

The required assembly machines and assembly methods are easy to design and implement. The clamping element ensures the application of a pressure force between the first and second lighting component, so that a good heat transfer from the LED to the lighting component is given.

It is envisaged that the fastening means is made of metal.

The execution of the fastener made of metal is extremely preferred because a metal fastener withstands the fastening forces for years. So it is known in contrast to plastic parts, that these are under heat and / or force on deform the passage of time and thus avoid the forces acting on it. This holds in particular in the high life expectancy of the LEDs the risk that the attachment function is not consistently fulfilled.

It can be provided that the shaft is formed by two blade wings.

It can be provided that the shaft head is annular and forms an annular space.

In a particularly preferred embodiment it is provided that the shaft has diameter-extending holding parts - in particular latching hooks - which can form a positive connection with the second component.

Since the fastener is involved by the formation of a clamping element with the build-up of the pressing force, a positive connection is preferable. This ensures, in contrast to a frictional connection to a great extent safe seating of the fastener in the recess of the second component.

It is further contemplated that the shaft head carries on its upper side facing away from the components at least one actuating piece, by means of which the shaft wings can be brought into their spread position.

In one embodiment, it is provided that the actuating piece is arranged by means of a spring element resiliently elastic on the shaft head, wherein the spring element serves as a clamping element.

A further embodiment provides that the shaft wings are guided from the underside facing the components through the annular space to the actuating pieces arranged on the upper side and are connected to the actuating pieces so that the actuating pieces hold the shank wings on the shaft head.

In this embodiment, the actuating pieces are moved in the direction of insertion of the shaft into the recess of the second component. The motion-coupled to the actuating pieces arranged shaft wings thus experience a likewise directed in the direction of insertion of the shaft movement, which also includes a directed away from the shaft longitudinal axis outward expansion movement.

Therefore, it is provided that the actuating pieces are resiliently displaceable in the direction of the shaft and the displacement induces a spreading of the motion-coupled shaft wings.

A further development provides that the shaft head has centering members directed in parallel to the shaft, which engage in the opening of the first component.

The invention will be explained in more detail below with reference to the illustration of an embodiment. The embodiment is in the 1 to 10 shown. Show it:

1 An LED light strip including fasteners according to the invention in exploded view,

2a Representation of a fastener according to 1 in a first side view,

2 B the fastener according to 2a in assembly position without representation of components fastened to one another,

2c a representation according to 2 B showing components fixed to one another,

3 Representation of a fastener according to 1 in a second side view,

4 the fastener according to 2 for connecting two components in perspective view,

5 Connection of two components with the fastener according to 2 in perspective view,

6 a sectional view of the compound according to 5 before tension of the components,

7 the sectional view according to 6 with strained components,

8th the representation according to 5 using a release tool,

9 a sectional view of the connection of two components according to 8th with fastening means in release position,

10 Representation of a stamped product from which the fastening means according to the invention is erected.

An inventive fastening means is generally denoted by the reference numeral 210 designated and described in execution and function below.

As in 1 is shown, the fastening means according to the invention is used 210 for arranging a first component 233 on a second component 234 , At the first component 233 it is, for example, a circuit board 235 on which one or more LEDs 224 are arranged. The second component 234 represents, for example, a lighting component 236 and serves in addition to the holder of the circuit board 235 deriving the operating heat of the LEDs 224 ,

The first component 233 has breakthroughs 238 on, the second component 234 a corresponding number of recesses 239 , The recesses 239 can also be formed as the material thickness completely penetrating openings as well as blind hole-like recesses, whereas the openings 238 in any case, the total material thickness of the first component 233 succeed.

For fastening the components 233 and 234 they are placed on top of each other in such a way that each opening 238 with a recess 239 flees. Now the fasteners 210 at the openings 238 set, through them into the recesses 239 inserted. In the present embodiment, the fastening means lock 210 lower side of the second component 234 ,

In the 2 and 3 is the fastener 210 each shown in a side view, wherein the fastening means 210 in 3 opposite to the illustration in 2 rotated 90 degrees about its longitudinal central axis L.

The fastener 210 is in the present embodiment as a retaining clip 211 is trained and will be described in the following 2 to 4 explained in its individual parts. Accordingly, the retaining clip divided 211 in a shaft head 216 and a shaft 212 , The shaft head 216 is substantially reduced to a ring element and carries two oppositely arranged actuating pieces 225 that have spring bars 226 in one piece cohesively to the shaft head 216 are connected.

The shaft 212 the retaining clip 211 is made of two wing wings 213 formed between them a gap 217 keep clear. The free ends 214 the shank wing 213 each carry an insertion tip 218 pointing towards the shaft head 216 each holding parts 219 in the form of latching hooks 220 are subordinate. By means of a sheep's neck 221 is every calf wing 213 on each one actuating piece 225 fixed integrally cohesively.

The spring bars 226 are outside of the shaft head 216 tethered and reshaped towards the shaft head center, leaving an inner annulus 247 of the shaft head 216 flashed. At her the spring bar 226 opposite ends are on the actuating pieces 225 the sheep's throats 221 the shank wing 213 Tethered and dive through the inner annulus 247 towards the bottom of the shaft head 216 So in the direction of the components 233 and 234 ,

6 shows the fastener 210 in pre-assembly, in which the retaining clip 211 with her shaft head 216 on the first component 233 rests. The shank wings 213 are through the opening 238 penetrated and sit in the recess 239 a, but without a determination of the components 233 . 234 to effect one another. The locking noses 220 are based in this pre-assembly on the inner walls of the recess 239 only off. The resetting elastic connection of the sheep thighs 221 on the actuating pieces 225 builds one against the shift into the gap 217 acting restoring force.

To now the components 233 and 234 to connect with each other, which in turn is primarily one with tracks 237 and LEDs populated PCB 235 and a lighting component 236 act as follows:
The circuit board 235 and the lighting component 236 be with breakthrough 238 and recess 239 aligned with each other. As already explained, the recess 239 both the lighting component 236 in the entire thickness of material passing through hole as well as a blind hole-like recess.

After arrangement of the components 233 and 234 on each other is the retaining clip 211 with the wing wings 213 ahead in the insertion direction X through the opening 238 through and into the recess 239 moved in until the stem head 216 on top of the circuit board 235 rests. The locking hooks 220 remain in this position in the region of the opening 238 or recess 239 so that the mere insertion of the fastener 210 still no determination of the components 233 and 234 leads to each other. This situation is described in 6 shown

7 shows the components 233 and 234 , by means of the retaining clip 211 are fixed to each other. For this purpose - starting from the representation of the 6 - The actuating pieces 225 shifted in the insertion direction X. As a result, the spring bars 226 put under tension and produce a force acting against the insertion direction X restoring force. At the same time with the operating pieces 225 motion-coupled shaft wing 213 also displaced in the insertion direction X and through the recess 239 pushed through.

The one-sided connection of the actuating pieces 225 over the spring bars 226 on the shaft head 216 leads to a circular arc-like movement of the actuating pieces 225 about an axis parallel to the shaft head surface extending axis. This arcuate motion is from the wing wings 213 traced. These occur as a result, after dipping the recess 239 in a spreading movement to the outside and engage under the lamp component 236 , A cranking section 249 additionally secures the reaching under the locking hooks 220 by having an exhibition of the snap hooks 220 is effected. The perspective view of 5 shows the means of the retaining clip 211 fixed components 233 / 234 ,

The for the realization of a defined pressure force between the components 233 and 234 necessary clamping forces are caused by the spring bars 226 produced, as far as the clamping element 240 to apply. The at the displacement of the actuating pieces 225 Restoring forces generated in the insertion direction X clamp the shaft head 216 against the locking hooks 220 , whereby the heat transfer securing pressure force is produced.

5 shows a perspective view of the fastener 210 which the components 233 and 234 determines each other. It can be seen that the actuating pieces 225 after locking the latching hook 220 the underside of the component 234 approximately parallel to the surface of the shaft head 216 are aligned. Is it the recess 239 around a blind hole, the shank wings can 213 be frictionally determined. Alternatively, the locking in an annular groove or differently configured recesses is conceivable.

Based on 8th to 9 will now be explained how the fastener 210 solve the invention to the components 233 and 234 separate from each other.

10 again shows a perspective view of the components fixed to each other 233 and 234 using the retaining clip 211 , A release tool in the form of a roughly triangel-shaped release clip 250 accesses release holes 227 the actuating pieces 225 one. Now those in the release holes 227 einitzenden clip ends 251 moving towards each other, which leads to a shift of the free ends 214 the shank wing 213 in the between the wing wings 213 arranged space 217 , In this way, the locking connection is released and the retaining clip 211 is opposite to the insertion direction X from the recess 239 and the opening 238 removable. Then let the components 233 and 234 separate each other.

As in particular from the 2 and 3 shows, the shaft head 216 underside centering 246 on. These grip when placed on the first component 233 in its opening 238 a, to a positional arrangement of the holder bracket 211 to ensure.

The fastener according to the invention is a one-piece stamped and bent part which has been formed from a blank. Such a blank is in 10 shown. The corresponding reference numerals designate the components present after the forming / bending process.

Other significant advantages of the invention can be achieved with the hand 2 B and 2C explain. In 2C Holds the retaining clip 211 the first component 233 on the second component 234 fixed by the latching hooks 220 after dipping through the opening 238 and the recess 239 on the underside of the second component 234 lock.

2 B shows the retaining clip 211 in mounting or fastening position according to 2C , but rotated by 90 degrees about the longitudinal central axis L. That is, the operating pieces 225 and the motion-coupled latching hooks with them 220 are in their two components adjoining position. The components 233 / 234 have been omitted for clarity of the following.

The first major advantage of the retaining clip 211 is that they have certain material tolerances, in particular tolerances of the material thickness of the components 233 / 234 can compensate. The purpose of the provided, particularly long travel of the actuating means 225 , When connecting components 233 / 234 , which correspond to the nominal dimensions, is determined by displacement of the actuating pieces 225 from their rest position (see 2A ) executed in the actuating direction x a normal stroke. This is sufficient to the latching hook 220 underside of the recess 239 exit and lock. As in particular from 2 B shows, however, remains between the actuating pieces 225 and the shaft head 216 A gap 252 , This allows a normal stroke in the direction x x overstroke and thus a further shift of the locking hooks 220 in the direction of actuation x, so that two components 233 / 234 can be set to each other, which have greater material thicknesses compared to the nominal dimensions. The retaining clip 211 is thus able to compensate for material tolerances in certain areas.

At the same time was in the retaining clip according to the invention 211 ensured that the possible overstroke of the actuating pieces 225 is limited to a plastic deformation of the spring element 226 and an associated damage to the spring element 226 is prevented. In the embodiment of the figures, this Überhubbegrenzung is mechanically realized by the path of the actuating pieces 225 in the direction of actuation x by a system of actuation pieces 225 on the shaft head 216 is limited. In that regard, the shaft head forms 216 an end stop for the maximum actuating stroke of the actuating pieces 225 in the direction of x. It is easy to imagine that through on the top of the shaft head 216 arranged cams, webs or pins also a suitable end stop for the actuating stroke can be formed.

Another advantage finally results from the specific design of the actuating pieces 225 , As in particular from the perspective views of 4 and 5 , but also for example 3 it can be seen, are the actuating pieces 225 designed in approximately kidney or bonenförmig and have a crescent-shaped recess. This ensures that the actuating pieces 225 even have spring properties and to ensure the defined system pressure of the components 233 / 234 contribute to each other. This effect is greater, the greater the overstroke and the closer the actuating pieces 225 get to their end stop.

Overall, such a fastener was created, which is a secure connection between two components 233 / 234 guaranteed to each other under a defined system pressure even with material thickness tolerances.

LIST OF REFERENCE NUMBERS

210

fastener

211

retaining clip

212

shaft

213

shank blades

214

free end

215

tailed end

216

stem head

217

gap

218

insertion

219

holding part

220

latch hook

221

shaft neck

224

engaging recess

225

operating pieces

227

release opening

233

first component

234

second component

235

circuit board

236

lights component

237

conductor path

238

perforation

239

recess

240

clamping element

246

centering

247

inner annulus

249

Verkröpfungsabschnitt

250

release bracket

251

clip ends

252

gap

L

longitudinal axis

x

Insertion or actuation direction

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• WO 2005/071273 A1 [0003]
• DE 102008005823 A1 [0005]

Claims (10)

Fixing means ( 210 ) - with an expandable shaft ( 212 ); With a shaft end arranged on a shaft end ( 216 ), - the shaft head ( 216 ) opposite the shaft ( 212 ) is widened in diameter, - with a spreading means by means of which the shaft ( 212 ) is resiliently spreadable, - wherein the fastening means ( 210 ) for arranging two components ( 233 ) 234 ) is provided to each other, in particular for the arrangement of a provided with an LED circuit board ( 235 ) on the holder serving a heat-dissipating lamp component ( 236 ), - by the shaft ( 212 ) through an opening 238 ) of a first component ( 233 ) and the shaft head ( 216 ) for the at least indirect support on the first component ( 233 ) is provided - and by the shaft ( 212 ) in a recess ( 239 ) of a second component ( 234 ) can be arranged - and by the shaft ( 212 ) after its spreading at least frictionally engaged in the recess ( 239 ) of the second component ( 234 ) is anchored, characterized in that - the fastening means ( 210 ) with a tensioning element ( 240 ), which over the shaft head ( 216 ) the first component ( 233 ) against the second component ( 234 ) tense. Fastening means according to claim 1, characterized in that the shaft ( 212 ) of two wing wings ( 213 ) is formed. Fastening means according to claim 1 or 2, characterized in that the shaft head ( 216 ) is annular and an annular space ( 247 ) trains. Fastening means according to claim 2, characterized in that the shaft head ( 216 ) on its components ( 233 . 234 ) facing away from the top at least one actuating piece ( 225 ), by means of which the shank wings ( 213 ) can be brought into their spread position. Fastening means according to claim 4, characterized in that the actuating piece ( 225 ) by means of a spring element ( 226 ) resetting elastic on the shaft head ( 216 ) is arranged, wherein the spring element ( 226 ) as a tensioning element ( 240 ) serves. Fastening means according to claim 2, 3 and 4, characterized in that the shank wings ( 213 ) of the components ( 233 / 234 ) facing the underside through the annulus ( 247 ) to the arranged on the top operating pieces ( 225 ) and to the actuating pieces ( 225 ), so that the actuating pieces ( 225 ) the wing wings ( 213 ) on the shaft head ( 216 ) hold Fastening means according to one of claims 1 to 6, characterized in that the fastening means ( 210 ) is made of metal. Fastening means according to one of the preceding claims, characterized in that the shaft ( 212 ) Durchmessererweiternde holding parts - in particular latching hook ( 220 ) - which form a positive connection with the second component ( 234 ) can enter. Fastening means according to claim 6, characterized in that the actuating pieces ( 225 ) towards the shaft ( 212 ) are resiliently displaceable and the displacement a spread of the motion-coupled shaft wings ( 213 ). Fastening means according to one of the preceding claims, characterized in that the shaft head ( 216 ) parallel to the centering organs ( 246 ), which in the opening ( 238 ) of the first component ( 233 ) intervene.

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