DE2626220A1 - FASTENING ELEMENT - Google Patents

Description

²⁶ ? ¹ 3 JL,

AWALl

uit. ing. II. NEGENDAjNTK (-1973) · difi ..- ing. II. IIATJCK dipi> phys. W. SCHMITZ i) in the ..- ing. E. GRAALFS · dipl-ing. W. WEIINERT · dipl-phys. W. CARSTENS

HAMBÜBG-MÜXCIIEN

ASSIGNMENT. TjUNGS ADDRESS: 2OOO HAMBURG 36 · NETTEK WALL · 41 "PT ^- PAS ^- F Ti PP TV TO-

- - ^ - TELEPHONE (O4O) 36 74 28 AND 30 4115

TELKGR. NEoBDArATBIVT HAMHtTRO 80OO MUNICH 2 MOZARTSTH. 23

ITW-ATECO GmbH. Telephone (080) 5380588 TEtEQR. NEaEBAPATENT

Stormarnstrasse 43-q- ° -

2000 Norderstedt 1 Hamburg. ₁₀ . _Jun i

Fastener

The present invention relates to a fastener For decorative covers, especially baffles on layout speaker boxes.

Such decorative covers are generally around light pressed wood or chipboard covered with fabric or foil, which are connected by means of an invisible connection be attached to the supporting components, housings, etc. These connections must be detachable at any time in order to achieve a Removal of the decorative covers and their dismantling to enable.

It is known to use double-sided self-adhesive tapes or attached Velcro tapes to meet these requirements. However, these connecting means have a number of disadvantages listed below. The ones attached with self-adhesive tapes Covers or baffles cannot be reused if dismantling becomes necessary, because the adhesive effect when loosened

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is no longer fully effective. It must therefore be used when reassembling new tapes are attached, which is cumbersome and expensive. In addition, with such a connection the exact placement of the cover on the component carrying it is necessary, since a subsequent shift in the case of an adhesive connection not flour · is possible. When using the mentioned Velcro tapes require the tape to be applied on both sides. Similar to the self-adhesive tapes The lateral displacement is also very limited here, as the individual Velcro only move a little and spring back. Further disadvantages are that the Velcro tape is very bulky and relatively expensive.

Particularly in the case of loudspeaker boxes it is necessary ■ a, the the baffle covering the housing to be attached to the housing of the box in a floating manner in such a way that parallelism is achieved by means of an alignment process can be made between the edges of the baffle and the box. To meet this requirement, the corresponding fastening means therefore have a relatively high lateral displacement allow. The known fastening means do not meet these requirements.

The invention is based on the object of a fastening element For decorative covers, especially baffles on loudspeaker boxes, to create that is reusable, a light one Allows assembly and disassembly of the covers and a relatively high lateral displacement of the same while being firm Hold secures.

709851/0293

According to the invention, this object is achieved by a fastening element solved, which by two identical, generally hollow cylinder-shaped sockets, from one end of which an elastic socket with an inner bore extends into the socket interior, as well as a generally double-cone-shaped connecting element for the sockets with a central flange and two in the direction on the free ends widening areas which in. the Inner bores of the elastic socket mounts are insertable, is marked.

During the assembly of the fastening element designed according to the invention, the sockets are designed in the shape of a hollow cylinder in suitable mounting holes of the parts to be connected, for example the housing and the baffle of a loudspeaker box, used, taking adequate precautions at the sockets are taken to ensure a tight fit of the same in the mounting holes. Here is the one with the elastic Socket end with inner bore at the input end of the receiving bore. Now the double-cone-fcig is trained Connection element for the sockets in the Elabian version of the inserted a mounted socket, wherein the widening area of the connecting element so far the elastic mount apart until it can pass the inner bore of the socket. As a result of the narrowing in the direction of the central flange Cross-section of the outward-widening area, the mount cross-section can now narrow again. The version is however still under tension, so that a firm hold

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of the connecting element is secured in the socket. Even though therefore the socket is sufficient against tensile stresses in directions parallel to the longitudinal axis of the connecting element Opposes high resistance, it allows the connecting element in any direction perpendicular to its longitudinal axis performing limited movements. This possibility of movement is made possible by the approximately ring-shaped contact between the Bore edge of the elastic mount and the widening area of the connecting element causes. This allows the connecting element on the one hand it will perform pendulum movements in any direction, however, will do its central flange on the other hand, due to the version standing under sufficiently high bias and the widening towards the free end Area of the connecting element adequately secured against pulling out.

After the connecting element is either in the on one side Housing or the socket mounted on the baffle is used, the socket is used to mount the baffle on the corresponding Housing bush pressed so that the connecting element fastened on one side with its free end part in the elastic Version of the other socket is inserted and snaps into its inner bore. The baffle is now firmly on the housing on and can - depending on the size of the angle of inclination of the widening area of the connecting element and the elasticity the socket socket - only with the application of a defi-

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ned force can be withdrawn from the housing. On the other hand, lets the type of connection proposed according to the invention to a certain extent Area pendulum movements of the connecting element around his Central flange closed, so that the housing and Schallwanä can perform shear movements relative to each other in certain orders of magnitude. This means that even after the connection has been established, the baffle can be moved to a certain degree and is therefore floating Storage of the same on the housing guaranteed. As a result, in contrast to self-adhesive tapes, even after production the connection via an alignment process made parallelism between the edges of the cover and those of the housing can be. In addition, with the solution proposed according to the invention, tolerances are excellent between the corresponding mounting holes of the one to be mounted Elements can be balanced. Finally, the assembly of the cover or baffle is made much easier.

The fastening element proposed according to the invention is especially because it has two identically designed sockets, easy to manufacture. The connection achieved by means of the fastener can - depending on the design of the socket socket and the Connecting element - loosened at any time with greater or lesser expenditure of force and reused in any way will.

According to a particularly preferred embodiment of the invention

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according to aiis formed fastening element, the elastic Socket version of several cup-shaped, through Slits separate spring segments are provided. With this embodiment, which is relatively easy to manufacture, on the one hand the on the elastic properties of the socket socket fully meet the requirements and on the other hand the contact surface kept between socket and connecting element so low that the connecting element pendulum movements unhindered can perform. The dimensioning of the individual Federse.gmente is in coordination with the selected shape of the connecting element and the desired easy or difficult dismantling the connection.

To ensure that the sockets are exactly seated in the respective mounting holes to secure, is preferably that socket end from which the elastic socket extends, flange-like expanded. The collar formed in this way lies against a round when the socket is inserted into the receiving hole circumferential approach, so that in this way the socket is not pressed too deeply into the bore. For further relief When installing the socket in the wood, the end opposite the socket end provided with the socket is chamfered on the outer edge.

In order to anchor the socket sufficiently on the walls of the bore, various training options are available Socket jacket conceivable. In a preferred embodiment

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the socket jacket is undercut on the outside Provide thickenings that claw into the hole in the wood when the bushing is driven. Of course the socket can too be used as a glued or screwed connection in the two components to be connected, with the Thickenings on the socket jacket can be dispensed with.

The above-mentioned embodiments in relation to Anchoring the socket in the receiving hole are preferably suitable for larger plate thicknesses that the length of the socket exceed. In an embodiment that is particularly suitable for thin material thicknesses, the socket jacket is slit open in such a way that that the jacket areas lying between the slots act as spring struts. These struts are when inserted the socket pressed into a suitable mounting hole wing inwards and, when the end position of the bushing is reached, snap outward so that the bushing is retained in the bore. In this embodiment, the outer jacket of the socket is advantageous slightly conical.

In order to be able to insert the connecting element through the inner bore to facilitate the elastic socket mounts in a preferred embodiment of the invention that in general Double-cone-like connecting element provided with dome-shaped end regions. When pushing in these areas in the socket socket will be the ends of the

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Feather pigments pressed outwards and slide on the surface along the dome until it reaches the widest point of the connecting element. The area that now follows narrows in the direction of the central flange so that the peder elements can snap back and in this position in which they are still are under tension, hold the connecting element.

In order to increase the snap action when inserting the elastic connecting element into the socket of the socket or to induce it a certain locking effect go according to a particular embodiment of the invention, the dome-shaped End areas with the formation of a re-entrant circumferential shoulder in the direction of the free ends expanding areas over. Depending on the size of the angle of inclination of this paragraph, the connecting element can be lighter or It is more difficult to pull out of the corresponding socket, i.e. at an angle of inclination of approximately 90 to the longitudinal axis of the connecting element the connection can hardly be dismantled. The choice of a suitable angle of inclination depends on the * requirements placed on the fastening element.

The areas widening in the direction of the free ends are advantageously conical or trumpet-shaped educated. The conically widening areas are found in particular together with the re-entrant circumferential shoulder Use. According to a further embodiment of the invention

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are the expanding areas over one, trumpet · » shaped to the middle of the element expanding area on the middle flange connected. By such an intermediate region, the connecting element is sufficiently long that the under Under certain circumstances, the covering attached to the inside of the cover can also be bridged. The covering can be attached to this Place wrinkles or double-apply.

For a better understanding of the invention, the following explanation of preferred embodiments serves in connection with of the attached drawing, of which

Fig. 1 shows the body of a loudspeaker box with a dismantled baffle shows in perspective view;

2 shows a section through a connection made with the fastening element according to the invention;

Fig. 3 shows a preferred embodiment of the socket in half section shows;

Figure 4 is a top plan view of the socket shown in Figure 3;

5 shows the side view of a first embodiment of the connecting element is;

Fig. 6 shows a second embodiment of the connecting element in side view;

Fig. 7 shows a third embodiment of the connecting element in Shows side view; and

Fig. 8 shows a second embodiment of the socket in half section.

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If one now turns to FIG. 1, one recognizes the housing 11 a loudspeaker box and the associated dismantled baffle 12. The four points are shown on the housing at which the fastening element 1 designed according to the invention is arranged will. With regard to the attachment of the baffle 12 to the housing of the loudspeaker box, it is required that it have a firm hold on the Housing of the box receives, but at the same time should be to a certain extent laterally displaceable to a subsequent alignment allow the baffle in relation to the edges of the cabinet. In addition, ropes with the chosen fasteners attch certain tolerances in the mounting holes of the housing and the baffle can be compensated for.

Fig. 2 shows one with that formed according to the invention. Fastening element made connection between housing and baffle in section. The fastening element 1 consists of two identical, generally hollow cylinder-shaped sockets 2 which are inserted into corresponding holes 3 on the housing and the baffle. Further details with regard to the insertion of the bushings are described with reference to the FIGS. 3 and 8 explained below. From one end of the socket extends into the socket interior an elastic socket with an inner bore which, in conjunction with the elastic socket of the corresponding adjacent socket, serves to receive a generally double-cone-like connecting element 4. Further details regarding the formation of the connection

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elements are explained in connection with Figures 5-7.

The function of the fastening element designed according to the invention can best be explained with reference to FIG. 2. As can be seen from the figure, the connecting element h can, due to the special double-cone-like design and the special design of the elastic mounts in the two sockets, perform pendulum movements around its center in all possible directions, so that to a certain extent shear movements between the baffle 12 and the housing are possible. The fastening element therefore allows a certain lateral displacement of the cover or baffle and housing relative to one another, the amount of which is marked with X in FIG. Although there is a possibility of floating movement, the fastening element provides adequate protection against tension, since when the baffle is pulled off the enlarged cone parts are drawn into the inner bores of the socket mounts and thus a sufficiently high resistance to tension is given. With a correspondingly high level of force, however, the connecting element can be pulled out of the socket in order to enable the baffle to be dismantled.

In FIG. 2, Y is also the depth dimension of the covering 13 indicated that is bridged by the fastener. The covering I3 can easily fold or double

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apply, since the areas of the connecting element widening towards the free ends and their extensions towards the Mifcfcelflansch are designed to be sufficiently long and thus also certain thickness fluctuations in the direction of the longitudinal axis of the connecting element can be compensated.

In Fig. 3 the socket 2, indicated only schematically in Fig. 2, is shown in partial section. The socket has a generally hollow cylindrical shape and has a socket jacket 20 _; which is widened like a flange 21 at the rear input end. At the front input end, the outer edge of the socket jacket is chamfered at 23. The flange-like extension 21 rests against a projection present in the receiving bore in order to ensure the correct seat of the socket in the depth. The chamfered outer edge 23 allows easy assembly of the socket in the wood.

On the outside, the socket jacket 20 is provided with several undercut thickenings 2k , which claw into the receiving bore 3 in the wood when the socket is driven. In Fig. Another possibility of fastening the socket 2 in the housing or the cover is shown. This type of fastening is used in particular for thin-walled panels. The thickenings 2k on the outside of the socket jacket are omitted. For this purpose, the jacket is provided with slots 29 that the between

Act lying Ik slots cladding regions / as struts 28

and hold the bushing against the plate. The outside of the

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The socket jacket is cylindrical, with the spring struts 28 themselves extend radially out of the lateral surface.

If one now turns to FIGS. 3 and k again, it can be seen that an elastic mount 22 with inner bore 25 extends from one end of the bushing into the interior of the bushing, which in the embodiment of FIG. 3 and k shown in FIG three cup-like spring segments 27 separated by slots Z6 is provided. These spring elements 27 are pushed outward when the connection el ement is inserted into the inner bore of the socket and, due to their elasticity, lie closely against the cone-like area of the connection element.

5-7 three preferred embodiment forms of the connecting element 4 are shown in side view. Common to all of the embodiments is the central flange 30 , from which corresponding conical areas extend on both sides and are configured differently depending on the embodiment. In the embodiment shown in FIG. 5, the areas widening in the direction of the free ends have a conical shape 31 and merge into domed end areas 32 which serve to facilitate the introduction of the connecting element into the sockets. The conically tapering areas 31 are each connected to the central flange 30 via a trumpet-shaped area 35 which expands towards the middle of the element.

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When in Fig. 6 embodiment shown, flared portions 33 are adjusting the conical regions 31 dev Fig.% / ^ Rompetenföxinlg present die.ebenfalls merge into rounded end portions 32nd The embodiment of FIG. 6 corresponds to that of FIG. 5 in the remaining features.

With the embodiment of the connecting element h shown in FIG. 7, particularly favorable results can be achieved. Here, the dome-shaped E ^ dbereiche 3 ² go to form a re-entrant peripheral shoulder ^ h in the down widening towards the free end areas which are formed in this embodiment conically 31 via. The shoulder 34 has the advantage that due to the abrupt change in cross section by means of the goblet-like spring ae {jmente 27 gewisso a snap action is achieved. In addition, this makes it even more difficult to pull the connecting element out of the socket socket. By modifying the two angles X and β shown in FIG. 7, where c * ~ is the angle of inclination of the areas widening towards the free ends and β is the angle of inclination of the shoulder 34, the dismantling of the connection can be regulated to a certain extent. The more the angle ρ approaches 0, the more difficult it is to dismantle the connecting element, which can ultimately lead to the connection not being able to be dismantled. The more acute the angle is chosen, the easier it is to pull the element out of the socket.

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The embodiments shown in FIGS. 5, 6 and 7 can be combined with each other, so that different Dismantling forces can be reached from one side to the other

When installing the baffle on the loudspeaker box, the fastening element designed according to the invention is used proceeded as follows:

In the appropriately arranged mounting holes in the housing and in the cover the sockets are used, after which the corresponding connecting elements either in the sockets on Housing or the sockets on the baffle are inserted. Then the baffle is pressed against the housing wall, whereby snap the free ends of the double cone into the sockets of the corresponding sockets. The baffle can now due to the floating bearing made in relation to the. Housing edges are aligned.

To manufacture the fastening element according to the invention preferably the plastics known in this field of application are used.

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Claims (11)

Claims 1. Fastening element for decorative covers, in particular baffles on loudspeaker boxes, characterized by two identical, generally hollow cylinder-shaped sockets (2), from one end of which an elastic socket (22) with an inner bore (25) extends into the interior of the socket, as well as a general Double-cone-shaped connecting element (k) for the sockets (2) with a central flange (30) and two areas (31, 33) widening in the direction of the free ends and which are inserted into the inner bores (25) of the elastic socket mounts (22) are insertable. 2. Fastening element according to claim 1, characterized in that the elastic socket socket (22) is provided by a plurality of cup-like design, separated by slots (26) spring segments (27). 709851/0293 3. Fastening element according to claim. 1 or 2, characterized in that that socket end from which the
elastic mount (22) extends, flange-like (21) is expanded. 4. Fastening element according to one of the preceding claims, characterized in that the m: .fc of the socket (22)
provided socket end opposite end on the outer edge is chamfered (23). 5. Fastening element according to one of the preceding claims, characterized in that the socket jacket (20) is provided with undercut thickenings (24) on the outside is. 6. Fastening element according to one of claims 1 to 4, characterized in that the socket jacket (20) slit open in this way is that the lying between the slots (29) (14)
Shell areas / act as spring legs (28). 7. Fastening element according to one of the preceding claims, characterized in that the generally double cone-like
formed connecting element (4) is provided with dome-shaped end regions (32). 709851/0293 8. Fastening element according to claim 7 »characterized in that the dome-shaped end regions (32 ^{) pass over to form a re-entrant circumferential shoulder (3 * 0 i * 1} which widen in the direction of the free ends areas (31, 33). 9. Fastening element according to one of the preceding claims, characterized in that the in the direction of the free ends widening areas are conical (31). 10. Fastening element according to one of claims 1 to 8, characterized characterized in that the widening areas are trumpet-shaped (33) are formed. 11. Fastening element according to one of the preceding claims, characterized in that the widening areas (31 »33) over a trumpet-shaped to the element center towards expanding area (35) are connected to the central flange (30). 709851/0293