CONNECTING FITTING

Description

[0001] The invention relates to a connecting fitting for the clamping connection of two components which abut one another and which each have a recess in a main surface, which connecting fitting has a web which can be placed flat on the main surfaces and on which two engagement parts are arranged for engagement in one of the recesses, wherein at least one of the engagement parts is held in an articulated manner on the web and can be clamped against a wall of the recess by means of a clamping device and at least one of the engagement parts is connected in one piece to the web, wherein the clamping device has a clamping screw and an abutment for the clamping screw which is held rigidly on the web.

[0002] A connecting fitting of this type, which is used, for example, to connect two mitred frame elements, is described in DE 20 2016 104 279 Ul.

[0003] The object of the invention is to create a connecting fitting that can be produced more cost-effectively.

[0004] This object is achieved according to the invention in that at least one of the engagement parts is connected to the web via a film hinge, the engagement part and the abutment delimit a tapered screw channel and the engagement part can be spread apart from the abutment in the manner of an expansion dowel when the clamping screw is screwed into the screw channel.

[0005] When the clamping screw is screwed in, the abutment and the engagement part are spread, whereby the engagement part is clamped against the wall of the recess. Advantageous embodiments of the invention are specified in the subclaims.

[0006] Optionally, the second engagement part can also be connected to the web via a film hinge and can be clamped against the wall of the recess of the other component by a clamping device. The clamping devices for the two engagement parts can be of identical design or at least operate according to the same functional principle.

[0007] In one embodiment, the two engagement parts can be spread apart in the same direction from the associated abutments. The abutment for a first of the engagement parts then forms a contact surface on the side opposite the engagement part, with which it is supported on the wall of the recess. When the first engagement part is then clamped against the opposite wall of the recess, the entire connecting fitting is firmly anchored in the recess of the first component. The two components can then be placed against one another in such a way that the web extends over the butt joint formed between the components and the second engagement part engages in the recess of the second component. By clamping the second engagement part, the two components are then firmly clamped against one another at the butt joint.

[0008] The web, the engaging parts, and the abutments can be formed from a single-piece plastic injection-molded part. Screw channels for the clamping screws can extend continuously in the transverse direction of the web, so that they completely separate the engaging part and the abutment from each other. The profiles intended to engage the threads of the clamping screws can then be designed so that the plastic part can be demolded using diagonal pulls. Depending on the design of these profiles, the frictional forces occurring on the walls of the screw channels when screwing in the clamping screws can be different for the profile on the side of the engaging part, on the one hand, and for the profile on the side of the abutment, on the other. So that when the screws are screwed in, a force acts that tends to shift the screws in the transverse direction of the web.However, this force can be compensated by attaching a support projection for the screw to one of the screw channel profiles.

[0009] The clamping screws can be made of metal or plastic and formed separately from the body that forms the web and the engaging parts. If both this body and the screws are made of plastic, the screws can also be connected to the plastic body of the web by a shearable connecting strip, so that the complete connecting fitting is a single piece when removed from the injection mold, making it easy to handle and package. When the connecting fitting is inserted, the screws are then screwed into the screw channels with a tool, automatically shearing off the connecting strips.

[0010] In the following, an embodiment example is explained in more detail using the drawing.

[0011] They show: Fig. 1a section through a connecting fitting together with two components to be connected by the fitting; Fig. 2a section along the line II - II in Fig. 1 ; Fig. 3 is a perspective view of the connecting fitting; and Fig. 4 is a view of a connecting fitting according to another embodiment.

[0012] In Fig. 1 The edge zones of a first component 10 and a second component 12 are shown in section, which abut one another at a butt joint 14. The components 10, 12 can, for example, be frame elements of a door frame that are to be mitered together at the butt joint 14.

[0013] Each of the components 10, 12 has in one of its main surfaces, namely in the Fig. 1 upper surface, a recess 16 or 18 in the form of a cup bore. A connecting fitting 20 is provided for clamping the components 10, 12, which in the example shown is formed by a one-piece injection-molded plastic part.

[0014] The connecting fitting 20 has a web 22 that rests flat on the upper sides of the components 10, 12 and extends across the butt joint 14. On the underside, the web 22 has a first engagement part 24 for engaging in the recess 16 of the first component 10 and a second engagement part 26 for engaging in the recess 18 of the second component 12. The engagement parts 24, 26 are each connected to the web 22 via a film hinge 28 with an arcuate cross-section.

[0015] Adjacent to each of the two film hinges 28, the web 22 has a screw hole for a clamping screw 32. The clamping screws 32 can each be screwed through the screw hole 30 into a screw channel 34 that extends transversely of the web 22 and separates the engaging part 24 or 26 from an abutment 36 or 38 that is rigidly arranged on the underside of the web 22.

[0016] The screw channels 34 are tapered downwards in width and are limited both on the side of the engagement part 24 or 26 and on the side of the abutment 36 or 38 by screw profiles which are complementary to the threads of the clamping screws 32.

[0017] As in Fig. 2 As shown, the abutment 36 is designed such that it fills more than half the cross-section of the first recess 16 and rests on the wall of the recess on the side opposite the first engagement part 24. When the clamping screw 32 is screwed into the screw channel formed by this abutment 36 and the engagement part 24, the first engagement part 24 is spread away from the abutment 36, deforming the film hinge 28, and is clamped firmly against the wall of the recess 16. In this way, the entire connecting fitting 20 is held clamped in the recess 16 of the first component 10.

[0018] In Fig. 2 The section plane passes through the film hinge 28 of the first engagement part 24, so that the engagement part can be seen in a top view. This engagement part 24 has the shape of a circular segment in plan view, but is conically widened downwards, forming a radially projecting edge at the lower edge that can firmly grip the peripheral wall of the recess 16. This ensures that the connecting fitting 20 is firmly held in the recess 16.

[0019] The abutment 38, which is opposite the second engagement part 26, does not completely fill the corresponding recess 18, but forms a rounded end of the connecting fitting.

[0020] The second connecting part 26 is, as Fig. 2 shows, also circular segment-shaped in plan, but is bevelled at the top in the direction of the butt joint 14, so that it Fig. 2 only shown in section in its right-hand part, but in plan view in the left-hand part. When the clamping screw 32 is screwed into the tapered screw channel 34 between the engaging part 26 and the abutment 38, the engaging part 26 is also pivoted, deforming the film hinge 28, and spread away from the abutment 38 so that it is clamped against the wall of the recess 18. The reaction force thereby exerted on the web 22 is absorbed by the abutment 36 being supported on the peripheral wall of the first recess 16. The parts of the first component 10 and the second component 12 that abut one another at the butt joint 14 are therefore clamped between the abutment 36 and the second engaging part 26 and pulled tightly together.

[0021] How Fig. 2 As shown, the second engagement part 26 has raised plateaus 40 on its peripheral edge, which are delimited by sharp horizontal edges. These edges claw into the peripheral wall of the recess 18 when the engagement part 26 is clamped against this peripheral wall. Since the plateaus 40 are also located below the pivot point formed by the film hinge 28, a reaction force with a vertical force component is generated during the pivoting movement of the engagement part 26, which pulls the film hinge 28 and the adjacent part of the web 22 downward, thus reliably preventing the web 22 from being bent away from the component 12 due to the tensile force occurring when the engagement part is clamped.

[0022] Since the film hinge 28 in cross section ( Fig. 1 ) has the shape of a horizontally positioned U-bend, it is compressible in the vertical direction. When the clamping screw 32 is screwed in far enough that its head rests on the edge of the screw hole 30, a downward force is exerted on the upper end of the film hinge 28, while the lower end connected to the engaging part 26 is pulled upward by the engagement of the threads of the clamping screw in the screw profile of the engaging part 26. The Fig. 1 The left side of the screw channel 34 is therefore shortened in the vertical direction, while the side formed by the abutment 38 is rigid. This generates an additional torque that tends to pivot the engagement part 26, together with the clamping screw 32 and the abutment 38, against the peripheral wall of the recess 18. In this way, the clamping force holding the components 10 and 12 together is further increased.

[0023] As in Fig. 2 As can be seen, the screw profiles that define the two screw channels 34 each form an arcuate recess 42 in the middle, which helps to center the clamping screws 22 in the screw channels. Fig. 1 It can be seen that the tapering of the screw channel 34 in the upper part is achieved by an oblique course of the wall of the engagement part 24 or 26, while the walls of the abutments 36, 38 run vertically in this part. This asymmetry results in the friction forces that occur when screwing in the clamping screw 32 between this clamping screw and the walls of the screw channel 34, also being asymmetrical and exerting a resulting force on the clamping screw, which, since the screws are screwed in clockwise, Fig. 1 towards the viewer and in Fig. 2 directed downwards. To prevent the clamping screws from migrating along the screw channel, the abutments 36 and 38 on the wall defining the screw channel 34 each form an asymmetrical support projection 44, by which the screw is securely held in its centered position.

[0024] In Fig. 3 the connecting fitting 20 (without the clamping screws 32) is shown in a view obliquely from above, so that the overall configuration can be seen more clearly.

[0025] The screw profiles on the walls of the screw channels 34 are designed in such a way that, on the one hand, they fit the threads of the clamping screws 32, but on the other hand, they can be demolded by means of diagonal pulls during the injection-molded production of the connecting fitting.

[0026] The clamping screws 32 can be made of metal or plastic and have a countersunk head or optionally also a flat head or a countersunk head with a collar, so that a flat bearing surface is formed, and they can have a slot, a Phillips head and / or a hexagon socket for the engagement of a screwing tool.

[0027] In a Fig. 4 In the embodiment shown, the clamping screws 32 are also made of plastic, and in the state in which the connecting impact leaves the injection mold, they are integrally connected to the web 22 by connecting strips 46. These connecting strips 46 are designed so that they can later be sheared off or torn off when the clamping screws are screwed in.

Claims

1. Connection fitting for bracingly connecting two components (10) which abut against each other and each have a recess (16, 18) in a main surface, which connection fitting (20) has a web (22) which can be laid flat on the main surfaces and on which two engagement parts (24, 26) are arranged for engagement in one of the recesses (16, 18) each, wherein at least one of the engagement parts (24, 26) is held in an articulated manner on the web (22) and can be clamped against a wall of the recess by means of a clamping device (32, 36, 38) and the at least one of the engagement parts (24, 26) is integrally connected to the web (22), the clamping device having a clamping screw (32) and an abutment (36, 38) for the clamping screw, which is held rigidly on the web (22), characterized in that the at least one of the engagement parts (24, 26) is connected to the web (22) via a film hinge (28), the engagement part (24, 26) and the abutment (36, 38) delimit a tapered screw channel (34) and the engagement part (24) can be spread away from the abutment (36, 38) in the manner of an expanding dowel when the clamping screw (32) is screwed into the screw channel (34).

2. Connection fitting according to claim 1, wherein both engagement parts (24, 26) are integrally connected to the web (22) via film hinges (28).

3. Connection fitting according to claim 1 or 2, wherein at least one wall of the screw channel (34) forms a supporting projection (44) for the clamping screw (32), which projection is arranged asymmetrically with respect to the center of the screw channel.

4. Connection fitting according to any one of claims 1 to 3, wherein the at least one of the engagement parts (26) extends from the position of the film hinge (28) approximately parallel to the web (22) towards the circumferential wall of the recess (18).

5. Connection fitting according to claim 4, wherein the at least one of the engaging parts (26) has at least one cutting contour (40) at the free end for clawing into the circumferential wall of the recess (18).

6. Connection fitting according to one of the claims 1 to 5, wherein the film hinge (28) is compressible in a direction parallel to the screw-in direction of the clamping screw (32) and the clamping screw (32) is supported with a head on the edge of a screw hole (30) of the web (22) in the screwed-in state.

7. Connection fitting according to one of the preceding claims, wherein the web (22) and the engagement parts (24, 26) are formed by an injection-molded part made of plastic.

8. Connection fitting according to claim 7, wherein the connecting screw (32) is made of plastic and, in a state before the connecting fitting is put into use, is integrally connected to the web (22) by a connecting strip (46).