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Screws and screw connections for components made of foam plastic

A screw connection and screw technology, which is applied in the direction of connecting components, screws, thin plate connections, etc., can solve the problems of screw entrance rupture, screw loss of retention, high screw screw-in torque, etc., and achieve the effect of avoiding cracking or cracking

Active Publication Date: 2021-02-26
LISA DRAXLMAIER GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When used in plastics including foamed plastics, all known screws have the disadvantage of damaging the plastic they enter, for example by cracking the screw entry or stress cracking
At the same time, the screws require a relatively high screw-in torque
In screw connections using MuCell injection molded parts, the compact layer, i.e. the outer layer of the component, is damaged, causing the conventional screw to completely lose its holding effect in the remainder of the foam layer

Method used

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  • Screws and screw connections for components made of foam plastic
  • Screws and screw connections for components made of foam plastic
  • Screws and screw connections for components made of foam plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0072] figure 1 A side view showing a section through a prior art plastic tube 4 of dense injection molded material with conventional thread rolled screws. When used in plastics, the known sharp-edged screws have the disadvantage of damaging the screwed-in plastic by breaking the screw opening or by stress cracking. At the same time, a relatively high torque is required to drive the screw.

[0073] In screw connections using MuCell injection molded parts, the compression layer is damaged by such screws, as a result, conventional screws completely lose their holding effect in the residue of the foam layer and can hardly be tightened in the second pass.

[0074] figure 2 A side view showing a section through a plastic tube 4 manufactured using a MuCell or other similar process with a screw 3 according to the invention. The outer shape of the screw 3 may be conical. Typically, the screw diameter measures 4, 4.5, 5, 5.5 or 6 mm and the screw length is 12 to 20 mm.

[0075] T...

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Abstract

The invention relates to a screw connection comprising a support member, an additional member and a screw to fasten the support member to the additional member, wherein the support member has a tube of plastic or a screw boss to receive in a frictional and positive fit Screws, and tubes are constructed of thermoplastic foam. The screw of the present invention has a blunt edge thread which enables the screw to compress the foam in the tube as it is screwed in. The ratio of the inner diameter of the tube to the diameter of the screw depends on the degree of foaming of the tube and decreases as the degree of foaming increases. This means that the threads penetrate less deeply into the foam or they displace the foam than conventional screws. This effect prevents damage to the tube. However, the screws also form a very tight fit.

Description

technical field [0001] The invention relates to a screw and a screw connection between a support part and an additional part, wherein the support part has a plastic tube for receiving the screw in a frictional and positive fit and at least the The tube is made of foam plastic. The invention also relates to a method of connecting a support part to another part using screws. Background technique [0002] Plastics are used in various fields such as the automotive industry mainly due to their high strength and low weight. Screw connections for obtaining detachable connections of plastic parts place special requirements, which cannot be satisfied satisfactorily, or not at all, by conventional sheet metal or wood screws. [0003] In particular, thread forming screws or thread rolling screws are known in the background art and are classified under the term "wood screws". They mainly consist of a head and a screw core in the form of an elongated cone or a pin that tapers generall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16B25/06
CPCF16B25/0042F16B25/0073F16B5/02F16B25/0015F16B25/0047F16B5/01F16B33/02
Inventor 坦贾·里斯麦尔诺伯特·西蒙莱昂哈德·多博什格雷戈尔·霍德尔约翰·彼得梅尔
Owner LISA DRAXLMAIER GMBH
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