TW201304656A - Fastening element for clamping sheets - Google Patents

Abstract

A fastening element for clamping together a stack of sheets comprising at least two sheets. The fastening element comprises at least one base portion extending along the stack of sheets and perpendicular to the planes of the sheets. Further, the fastening element comprises a flange portion which extends substantially perpendicular from the base portion, and a pointed element which extends in an acute angle with respect to the base portion. The flexible fastening element generates a spring force which clamps the sheets of the stack of sheets together between the at least one flange portion and the at least one pointed element. In this grip position, the at least one pointed element grips at least one edge of a bottom sheet of the stack of sheets, and a top sheet of the stack of sheets is allowed to move in relation to the at least one flange portion.

Description

Fixing element for clamping sheets

The present invention relates to a fixing element for clamping a stack of sheets together.

The use of light-emitting diodes (LEDs) is used in a variety of lighting applications. LEDs are increasingly being replaced as one of traditional incandescent lighting because LEDs have the advantage of providing a bright light, are relatively inexpensive, and draw very little power. In addition, LEDs have a long operational life. For example, a white LED can last for 100,000 hours, which is roughly 20 times the operational life of an incandescent bulb.

However, in order to maintain a long life and/or avoid damage including one of the LED lighting configurations, it is appropriate that the configuration of the lighting configuration is subject to the effects of temperature on the materials used in the lighting configuration (such as, for example, high/low temperature and/or Mechanical stress of temperature fluctuations). Temperature conditions may be caused externally (eg, from a lighting configuration environment) and/or internally (eg, fluctuations in heat generated by LEDs of the lighting configuration during operation).

A lighting arrangement is disclosed in the patent document WO 2010/032169, which comprises an LED, a printed circuit board (PCB) having a conductive/thermal conducting portion, and a heat release member for dissipating heat generated by the LED during operation. During operation, heat is transferred from the LED to the heat release component via the conductive portion of the PCB. More specifically, the LED is provided on an LED wafer that is thus disposed on a substrate, wherein an electrical/thermal connection between the substrate and the conductive portion of the PCB is provided by electrical contact and/or thermally conductive adhesive. Therefore, from LED Heat can be transferred along a heat transfer path to the heat release component, wherein a portion of the heat transfer path (from the LED to the PCB) includes electrical contacts and/or thermally conductive adhesive.

However, attention can be paid to alternative solutions to the effects of temperature.

It is an object of the present invention to provide a device that reliably accommodates the effects of temperature on materials.

This and other objects are achieved by providing a fixed element having one of the features defined in the independent technical solution. The preferred embodiments are defined in the accompanying technical solutions.

Thus, in accordance with the present invention, a securing element for clamping a stack of sheets comprising at least two sheets together is provided. The securing member includes at least one base portion that, in use, extends along at least a portion of at least one edge of the stack of sheets and perpendicular to a plane of the sheets. Additionally, the securing member includes at least one flange portion extending substantially perpendicularly from the base portion and at least one prong member extending at an acute angle relative to the base portion. The fixing element is flexible and when used in a clamping position, the fixing element generates a spring force that clamps the sheet stack of sheets between the at least one flange portion and the at least one pointed element Together. In this gripping position, the at least one prong member grips at least one edge of one of the bottom sheets of the stack of sheets and one of the top sheets of the stack of sheets allows movement relative to the at least one flange portion.

Accordingly, the present invention is based on the concept of providing one (several) fixing elements that are capable of flexibly clamping/pressing/squeezing a stack of sheets together by a compressive force. Due to the flexibility of the fixing element, it allows one of the top sheets of the sheet stack to be Movement of the flange portion causes the fixation element to accommodate any movement of the top sheet due to, for example, thermal expansion/contraction. In other words, the fixing element accommodates the thermal properties of the sheet and/or, for example, the difference in possible thermal expansion between a top sheet and a bottom sheet (since the top sheet is free to move under the spring features of the fixing element). The invention thereby mitigates deleterious temperature dependent effects on the sheet material (such as, for example, due to one or a few sheets of thermal stress).

Another advantage of the present invention is that the fixation element of the present invention produces a predetermined compressive force when clamping the sheet, which further mitigates the occurrence of stress cracking. This is highly beneficial because the predetermined compressive force from the fixation element can accommodate the properties of the sheet (such as material thickness, thermal expansion, hardness and/or strength). Therefore, the clamping of the sheet is adapted to the material/thermal condition of the sheet.

Another advantage of the present invention is that the securing member grips the sheet forcefully/steadily. Thus, in the clamping position of the fixation element, the clamping of the sheet does not require any additional fixing members commonly used in prior mounting techniques, such as, for example, glues, screws, and the like. Therefore, the present invention is cost effective since the additional members for attaching/fixing the sheets to each other can be omitted. Furthermore, the present invention can be used when clamping sheets are stacked and/or when recirculating sheets are stacked, since fixing elements according to various embodiments of the present invention can be used in place of other fixing members such as, for example, glues, screws, and the like. Provide an easier installation.

Furthermore, the present invention clamps more reliably than adhesives which can negatively affect the positioning between the sheets (especially if exposed to large temperature variations) and/or screws which can damage the sheets during installation. The sheets are stacked.

Another advantage of the present invention is that the construction of the fastening element of the present invention is extremely easy to mount to the stack of sheets. Simple and intuitive application of fixed components to sheet stacking Improve installation efficiency, thereby avoiding any hassle, trouble, and/or expensive installation.

Furthermore, since the fixing element provides a clamping between the flange portion and the tip element during use, clamping the edge of the bottom sheet of the stack of sheets, the fixing element allows from the back/bottom side of the bottom sheet (for example) to one One of the heat dissipating components directly heats the heat transfer path/heat path. For example, if the bottom sheet is a heat generating device (such as an LED carrier), heat generated from the carrier during operation can be efficiently transferred to the device by direct thermal contact between the carrier and the underlying heat sink. heat sink. Thereby, the fixing element of the invention achieves a lower operating temperature of the carrier during operation and thus achieves a better performance.

The term "fixing element" as used herein means a clip, a spring clip, a clamp, a retaining element or the like.

The term "sheet" as used herein means a relatively flat sheet/panel that can be passive (eg, a sheet such as a lens/window having optical properties or a sheet of solid material such as a plastic/metal sheet). Or active (for example, including one of electronic devices (such as LEDs)). Further, the term "tip element" means a tapered element such as an end, a spike or the like.

According to an embodiment of the invention, the pointed element may extend towards the flange portion. In this embodiment, the fixation element clamps the stack of sheets in a gap between the pointed element and the flange portion when in use. In other words, the clamping force is provided in a plane/direction from one of the pointed element to the flange portion. An advantage of this embodiment is that the configuration can further improve the reliability of the clamping because the fixing member thereby reduces the shear stress in the sheet caused by the fixing member and/or Or reduce a clamping instability.

According to an embodiment of the invention, a flange portion may be provided at a first end of the base portion and a tip element is provided at a second end of the base portion, wherein the first end is opposite the second end provide. An advantage of this embodiment is that a relatively small fixed element can be used to clamp a relatively large stack of sheets.

In accordance with an embodiment of the present invention, the flange portion can have an end that is oriented in one of a direction substantially parallel to the base portion, with the pointed element pointing toward the end. In this embodiment, the fixation element can have a gull-wing shape in which the end of the gull-wing shape provides a beneficial line of contact between the flange portion and the top sheet in terms of one of the top sheets. Furthermore, one of the fixing elements on the top sheet is well defined by the sliding portion.

According to an embodiment of the invention, the fixing element can be made of sheet metal. An advantage of this embodiment is that the securing element made of sheet metal is flexible to provide a relatively high spring force such that the securing element suitably grips the stack of sheets. Furthermore, one of the fixing elements made of sheet metal is relatively inexpensive and/or easy to produce.

According to an embodiment of the invention, the pointed element may be triangular in shape. One advantage of the present invention is that the apex of the triangular pointed element securely grips the bottom sheet in the gripping position when the securing element is in use, wherein the apex penetrates or surrounds the material of the bottom sheet as the sheet is stacked.

According to an embodiment of the invention, the fixing element may further comprise a central portion, wherein at least one of the base portions extends substantially perpendicularly from the central portion. The fixation element further includes at least one auxiliary flange configured to apply a force to the fixation element from one of the top sheet toward one of the bottom sheets The tip element is released from the edge of one of the bottom sheets of the stack of sheets. Thereby the fixing element is moved from the clamping position to a locking position. In this locked position, the central portion can be secured to a housing. Furthermore, the fixing element creates a spring force between the flange portion and the central portion that clamps the sheets of the stack of sheets together and one of the top sheets of the stack of sheets allows movement about the flange portion. In other words, the auxiliary flange releases the tip element such that the clamping in the locked position is provided between the flange portion and the central portion. One advantage of this embodiment is that a greatly improved thermal contact can be provided between the bottom sheet and the underlying outer casing or other heat dissipating structure, such as a heat sink. This is explained by the observation that in the clamping position, the force between the flange portion and the tip element slightly neutralizes the force between the bottom sheet and the outer casing. Thus, if the central portion is secured to the outer casing (i.e., the stack of sheets is secured to the outer casing), the pointed element can be released from the bottom sheet to provide an improved thermal path between the bottom sheet and the outer casing.

The term "housing" as used herein means a cover, plate, element or the like that may have the properties of heat dissipation.

According to an embodiment of the invention, the auxiliary flange may extend beyond the tip element from one of the central portions in a direction parallel to the plane of the central portion. Thereby, the pointed elements are released from the edge of the bottom sheet of the stack of sheets when a force is applied to the fixing element from one of the top sheets toward the bottom sheet. An advantage of this embodiment is that the auxiliary flanges thereby easily "push" the pointed elements away from the attachment/fixation of the bottom sheet.

According to an embodiment of the invention, the auxiliary flange can provide the fixing element in a direction perpendicular to one of the normal of the central portion and perpendicular to the direction of the tip element One of the axes of rotation. Thereby, the tip elements are released from at least one edge of the bottom sheet of one of the sheet stacks once the fixing element is rotated when a force is applied from the top sheet toward one of the bottom sheets to the fixing element. In other words, in this embodiment, the auxiliary flange can act as a pivot point (eg, between the central portion and the tip element). If a force is applied to the central portion, the auxiliary flange is configured to allow the pointed elements to move away from the attachment/fixed rotation of the bottom sheet.

According to an embodiment of the invention, the tip element may extend in a direction substantially perpendicular to the flange portion. This embodiment provides for the decoupling of the flange portion and one of the pointed elements in terms of orientation. For example, if the securing member includes a rectangular central portion, the flange portion can extend from the opposite side of the base portion and the pointed members can extend from opposite sides of the central portion.

According to an embodiment of the invention, the central portion may be substantially rectangular and the fixation element may comprise at least two base portions disposed on opposite sides of the central portion. If two base portions are provided, then in this embodiment the securing member acts like a base to provide a stable, easy to apply and reliable securing member. Alternatively, the fixing member may include four base portions disposed on each of the four sides of the rectangular central portion to further improve the clamping effect of the fixing member.

According to an embodiment of the invention, the central portion may further comprise a hole configured to allow the fixation element to be secured to the housing. An advantage of this embodiment is that the securing element is provided for securing/fixing/attaching the securing element to one of the apertures of the housing (e.g., in a locked position), wherein a screw or the like can be used as a securing member.

Furthermore, the fixing elements according to various embodiments of the invention may advantageously be included In a light emitting arrangement, the light emitting arrangement further includes a carrier, at least one light emitting diode (LED) for emitting light, one lens element configured to refract light emitted by the at least one LED, and configured An outer casing for the carrier for dissipating heat generated by the at least one LED during operation from the carrier. The fixation element clamps the lens element with the carrier, wherein the lens element is movable under the flange portion of the fixation element (eg, due to thermal expansion). This is beneficial for illuminating configurations because the securing elements thereby mitigate harmful temperature related effects such as, for example, breakage of lens elements due to thermal stress.

According to an embodiment of the invention, the lens element and the carrier may comprise a cavity configured to cover the fixed element. In this embodiment, the cavity is provided in a direction from one of the top sheets toward the bottom sheet. An advantage of this embodiment is that the fixing element can be provided in a central portion of the lens element/carrier, i.e. not only at the edge of the lens element/carrier. Thereby, the lens elements and the carrier can be clamped more stably and reliably.

These and other aspects of the present invention will now be described in more detail with reference to the accompanying drawings.

In the following description, the invention is described with reference to a fixing element for clamping a stack of sheets together.

1 is a schematic perspective view of one of the fixation elements 100 for clamping a stack of sheets together in accordance with an embodiment of the present invention. The fixation element 100 comprises a rectangular base portion 101 that is substantially flat and can be made from sheet metal. A flange portion 102 extends substantially perpendicularly from the base portion 101, The middle flange portion 102 is provided at one of the first ends of the base portion 101. Two seats having three triangular shaped pointed elements 103 are provided, the pointed elements 103 extending at an acute angle relative to the base portion 101 and directed toward the flange portion 102. A pointed element 103 is provided at one of the second ends of the base portion 101 (at the opposite end of the flange portion 102). One of the central flanges 104 having a much smaller size than the base portion 101 is generally provided in the middle of the base portion 101. The center flange 104 extends at an acute angle relative to the base portion 101 and is directed toward the flange portion 102.

The fixation element 100 (which may be made of sheet metal) is flexible. When the fixation element 100 is in a gripping position in use, it creates a spring force between the flange portion 102 and the tip element 103 that clamps the sheets of the stack of sheets (not shown) together. The pointed element 103 grips one of the edges of one of the bottom sheets of the stack of sheets and one of the top sheets of the stack of sheets allows movement about the flange portion 102. The central flange 104 contributes to the spring force of the stationary element 100.

2a-2c are schematic side and schematic cross-sectional views, respectively, of one of the fixation elements 100 shown in FIG. 1, in accordance with an embodiment of the present invention. In Fig. 2a, the flange portion 102 is provided with one end directed in one direction substantially parallel to the base portion 101 and the pointed element 103 is directed toward the end. In Fig. 2b, the flange portion 102 extends vertically from the base portion 101 with the pointed element 103 and the central flange 104 directed toward the end of the end facing the flange portion 102. In Figure 2c, the flange portion 102 has a "gull wing" shape that includes a first portion that slopes downwardly and a second portion that is shorter than the first portion and slopes upwardly. Here, the pointed element 103 points toward the downwardly directed end of the "gull wing" shape towards the flange portion 102.

3a through 3e are perspective views of a securing member 300 including two base portions 301 and a central portion 304, in accordance with an embodiment of the present invention. In Figure 3a, the two base portions 301 are substantially perpendicular and extend from opposite sides from a substantially square central portion 304. The flange portion 302 extends from the respective base portion 301 in opposite directions and each flange 302 has a "gull wing" shape as previously described.

The pointed element 303 extends at an acute angle relative to the base portion 301. Further, in Fig. 3a, the pointed element 303 extends in a direction substantially perpendicular to the direction in which the flange portion 302 extends. The pointed element extends from opposite sides of the central portion 304 of the two base portions 301 that do not extend. In other words, from the four sides of the central portion 304, the base portion 301 extends from opposite sides and the pointed element 303 extends from two other opposite sides of the central portion 304. On the other hand, in Fig. 3b, the pointed element 303 extends from the side of the central portion 304 which is identical to the two base portions 301. A hole 305 is disposed in the central portion 304 to allow the securing member 300 to be secured to a housing (not shown).

Figure 3c shows a side view of the fixation element 300 in one of the planes of the central portion 304. A top view of one of the fixation elements 300 is shown in Figure 3d.

Figure 3e shows a cross-sectional view of one of the fixation elements 300 with the prong elements 303 extending from the side of the central portion 304 that extends the same as the two base portions 301. Similar to the described function of the fixation element 100 shown in Figure 1, the fixation element 300 is used on both sides of the fixation element 300 comprising the base portion 301, the flange portion 302 and the pointed element 303 when used in a clamped position. A spring force is generated in which one of the top sheets (not shown) of the stack of sheets allows movement about the flange portion 302.

4a through 4e are cross-sectional views of a securing member 400 including an auxiliary flange 405/407, in accordance with an embodiment of the present invention. In Fig. 4a, the fixation element 400, in a clamping position, creates a spring force between the flange portion 402 and the prong member 403 that clamps the sheet stacking sheets 410, 411 together, wherein the prongs Element 403 holds one of the edges of one of the bottom sheets 411 of the stack of sheets. In the two-dimensional view of Figure 4a, the auxiliary flange 405 extends away from the central portion 404 and beyond the tip element 403 in one of the directions parallel to the plane of the central portion 404. Here, the direction of the auxiliary flange 405 is provided to be substantially parallel to the pointed element 403. Alternatively, the auxiliary flange 405 can be provided to be substantially perpendicular to the pointed element 403.

If a force is applied to the fixation element 400 from one of the top sheet 410 toward the bottom sheet 411, the fixation element 400 can be moved from the clamped position to a locked position, which is shown in Figure 4b. If the fixation element 400 is moved from the clamped position to the locked position, the auxiliary flange 405 is configured to release the pointed element 403 from the edge of the bottom sheet 411 of the stack of sheets. In other words, when the fixing member 400 is stacked downward (as can be seen in Figures 4a to 4b), the auxiliary flange 405 slides on the edge of the top sheet 410, thereby pushing the tip from the edge of the bottom sheet 411 of the sheet stack. Element 403. In Figure 4b, the central portion 404 is secured 406 to a housing 412 such that the securing member 400 creates a spring force between the flange portion 402 and the central portion 404 that clamps the sheet stacking sheets 410, 411 together. The top sheet 410 of the stack of sheets allows movement about the flange portion 402.

A fixing element 400 in a clamping position similar to that of Fig. 4a is shown in Fig. 4c. Here, the auxiliary flange 407 is shown as a part of a circle, whereby One of the rotational axes of the fixation element 400 is provided in a direction perpendicular to one of the normal to the central portion 404 and one of the directions perpendicular to the pointed element 403. For the left hand side portion of the fixation element 400 (as shown in Figure 4c), this means that one of the fixation elements 400 is rotated clockwise. Thereby, the tip element 403 is released from the edge of the bottom sheet 411 of the sheet stack once the fixing member 400 is rotated when a force is applied from the top sheet 410 toward one of the bottom sheets 411 to the fixing member 400. Thereby, the fixing element 400 is moved to a locked position, which is shown in Figure 4d. In this locked position, the central portion 404 is secured 406 to a housing 412 such that the securing member 400 creates a spring force between the flange portion 402 and the central portion 404 that clamps the sheet stacking sheets 410, 411 together. The top sheet 410 of the stack of sheets allows movement about the flange portion 402.

5 is an exploded view of one of the illumination arrangements 505 of one of the fixation elements 500 for clamping a lens element 501 into a carrier 503, included in a cover 502, in accordance with an embodiment of the present invention. The carrier 503 includes a plurality of light emitting diodes (LEDs) for emitting light and lens elements 501 disposed above the carrier 503 are configured to refract light emitted by the LEDs. Cover 502 encloses the sides of fixation element 500, lens element 501, and carrier 503. The cover 502 can be secured to a housing 504 by screws, wherein the housing 504 is configured to dissipate heat generated by the LEDs of the carrier 503 during operation from the carrier.

6 is a perspective view of one of the illumination arrangements 605 including a lens element 602, a carrier 601, and a fixation element 600, in accordance with an embodiment of the present invention. Lens element 602 and carrier 601 include an outer cover fixing element 400 configured One of the cavities.

Figure 7 is a schematic illustration of one of the lens elements 700 coupled to a LED device 701 by a screw 702 in accordance with the prior art. The figure shows four LEDs arranged on a LED device 701 in a 2x2 matrix with screws 702 attached between the four LEDs through LED element 700 to LED device 701. In a temperature cycling test, prior art configurations were exposed to large temperature variations between -40 °C and 85 °C. After 30 cycles, the disclosed configuration breaks in the lens element 700. The flexible solution of the present invention (as shown by the securing element 800 for clamping the lens element 801 and the carrier 802 together) eliminates stress (due to the spring force of the fixed element 800) to accommodate thermal conditions. By this, the fixing element 800 of the present invention allows the thermal expansion of the lens element 801 and the carrier 802 to still securely and reliably clamp the lens element 801 together with the carrier 802.

Although the present invention has been described with reference to the specific exemplary embodiments of the present invention, many different alternatives, modifications, and the like are apparent to those skilled in the art. Therefore, the described embodiments are not intended to limit the scope of the invention (as defined by the scope of the accompanying claims). For example, any dimension of the securing member can be different than the dimensions of the securing member shown in Figures 1 through 7, i.e., the base portion, the flange portion, the central portion, and/or the pointed member can be larger, smaller, thicker. , thinner, and so on. Moreover, for the purpose of releasing the pointed element 403 from the bottom sheet 411, the auxiliary flanges 405 and 407 can be provided in other shapes and/or provided in other positions relative to the fixed element 400. For example, the auxiliary flanges 405 and 407 can be configured to be perpendicular to the elongation of the flanges 405 and 407 as shown in Figures 4a through 4d, i.e., rotated 90 degrees.

100‧‧‧Fixed components

101‧‧‧Base section

102‧‧‧Flange section

103‧‧‧ pointed components

104‧‧‧ center flange

300‧‧‧Fixed components

301‧‧‧Base section

302‧‧‧Flange section

303‧‧‧ pointed components

304‧‧‧ central part

305‧‧‧ hole

400‧‧‧Fixed components

402‧‧‧Flange section

403‧‧‧ pointed components

404‧‧‧ central part

405‧‧‧Auxiliary flange

407‧‧‧Auxiliary flange

410‧‧‧Top sheet

411‧‧‧Bottom sheet

412‧‧‧ Shell

500‧‧‧Fixed components

501‧‧‧ lens components

502‧‧‧ cover

503‧‧‧ Carrier

504‧‧‧Shell

505‧‧‧Lighting configuration

600‧‧‧Fixed components

601‧‧‧ Carrier

602‧‧‧ lens components

605‧‧‧Lighting configuration

700‧‧‧ lens elements

701‧‧‧LED devices

702‧‧‧ screws

800‧‧‧Fixed components

801‧‧‧ lens components

802‧‧‧ carrier

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic perspective view of one of the fixing members for clamping a stack of sheets together in accordance with an embodiment of the present invention.

2a-2c are schematic front and schematic cross-sectional views, respectively, of one of the securing elements shown in Fig. 1, in accordance with an embodiment of the present invention.

3a through 3e are perspective views of a securing member including two base portions in accordance with an embodiment of the present invention.

4a through 4d are cross-sectional views of a securing member including an auxiliary flange in accordance with an embodiment of the present invention.

Figure 5 is an exploded view of one of the illumination arrangements of a fixed element for clamping a lens element to a carrier, included in a cover, in accordance with an embodiment of the present invention.

6 is a perspective view of one of the illumination configurations including a lens element, a carrier, and a fixation element, in accordance with an embodiment of the present invention.

Figure 7 is a schematic illustration of one of the lens elements, a carrier and a fixed element in accordance with one embodiment of the present invention by a screw attached to one of the lens elements of an LED device in accordance with the prior art.

600‧‧‧Fixed components

601‧‧‧ Carrier

602‧‧‧ lens components

605‧‧‧Lighting configuration

Claims (14)

A fixing member for clamping a stack of sheets comprising at least two sheets, the fixing member comprising: at least one base portion, in use along at least a portion of at least one edge of the stack of sheets and perpendicular to the Extending in a plane of the sheet, at least one flange portion extending substantially perpendicularly from the base portion, and at least one pointed element extending at an acute angle relative to the base portion, wherein the fixing member is flexible And generating a spring force when used in a clamping position, the spring force clamping the sheets of the stack of sheets between the at least one flange portion and the at least one pointed element, wherein the at least one The pointed element grips at least one edge of one of the bottom sheets of the stack of sheets and one of the top sheets of the stack of sheets allows movement relative to the at least one flange portion. The securing member of claim 1, wherein the at least one prong member extends toward the at least one flange portion. The fixing member of claim 1 or 2, wherein the at least one flange portion is provided at one of the first ends of the at least one base portion and the at least one pointed member is provided at one of the at least one base portion At the end, the first end is provided opposite the second end. The fixation element of claim 1 or 2, wherein the at least one flange portion has an end that is oriented in one of a direction substantially parallel to the base portion and wherein the at least one prong member is pointed toward the end. A fixing member according to claim 1 or 2, wherein the fixing member is made of a thin metal Made of tablets. A fixing element according to claim 1 or 2, wherein the at least one pointed element has a triangular shape. The securing member of claim 1 or 2, further comprising: a central portion, wherein the at least one base portion extends substantially perpendicularly from a plane of the central portion, and at least one auxiliary flange configured to Distracting the at least one prong element from the at least one edge of one of the bottom sheets of the stack of sheets when the top sheet is biased toward one of the bottom sheets toward the securing member to thereby secure the central portion to an outer casing Moving the fixing element from the clamping position to a locking position, the fixing element thereby generating a spring force between the at least one flange portion and the central portion to clamp the sheets of the stack of sheets together At the same time, one of the top sheets of the stack of sheets is allowed to move about the at least one flange portion. The fixing member of claim 7, wherein the auxiliary flange extends from the central portion in a direction parallel to the plane of the central portion beyond the at least one prong member such that from the top sheet toward the bottom sheet The at least one prong element is released from the at least one edge of the bottom sheet of the stack of sheets when a force is applied to the securing member. The fixing member of claim 7, wherein the auxiliary flange provides one of the rotational axes of the fixing member in a direction perpendicular to a normal to the central portion and perpendicular to the direction of the at least one pointed member such that When the top sheet applies a force to one of the bottom sheets toward the fixing member, once the fixing member is rotated, the at least one pointed member is stacked from the sheet stack The at least one edge of the bottom sheet is released. The fixing member of claim 7, wherein the at least one pointed element extends in a direction substantially perpendicular to the flange portion. The securing member of claim 7, wherein the central portion is substantially rectangular, and the securing member comprises at least two base portions disposed on opposite sides of the central portion. The securing member of claim 7, wherein the central portion further comprises a hole configured to allow the securing member to be secured to the housing. A light emitting arrangement comprising: a carrier comprising at least one light emitting diode LED for emitting light, a lens element configured to refract the light emitted by the at least one LED for use in the carrier An outer casing configured to dissipate heat generated by the at least one LED during operation from the carrier, and a fixing member of any one of claim 1 to claim 12 for use in the lens element And the carrier is clamped together. The illumination configuration of claim 13, wherein the lens element and the carrier comprise at least one cavity configured to overlie the fixation element.