DD265376A1 - METHOD FOR PRODUCING A PROFILED SELF-WEARING PLASTIC FRAME FOR A BIKE, IN PARTICULAR A RACING WHEEL - Google Patents

Abstract

Process for producing a profiled self-supporting plastic frame for a bicycle, in particular a racing bicycle. The method is used particularly advantageously for the production of extremely loaded track racing bicycles. It is characterized by prefabricating two symmetrical main frame elements which are included in the outer rear frame and two symmetrical inner rear elements which form the high-strength outer skin. In the frame members thus produced are sandwiched support core elements, preferably made of honeycomb plastic. The individual layers of the support core elements are assembled individually and one after the other and pressed under vacuum. The support core elements are subsequently ground flat to the size of the frame elements. Immediately before the compression of the symmetrical frame and support core elements, a connection layer is arranged between them, wherein first the rear elements and then the main frame elements are connected together. FIG. 3 {plastic frame, racing bicycle, frame element, main frame element, rear triangle, rear element, outer skin, supporting core, supporting core element, layer, vacuum, connecting layer}

Description

Title of the invention

Method for producing a profiled self-supporting Piastrahroens for a bicycle, especially a racing bike

Field of application of the invention:

The invention relates to a method for producing a profiled plastic frame for a bicycle, in particular a racing bicycle, and is applicable in particular for the production of tires for extremely stressed railway racing bicycles,

Character! Αtik of known teohnisohen solutions

From DE-OS 233384U a method for producing a Plastrahinens for a bicycle is known, naoh the. In injection molding a eintüokiges plastic molding, consisting of a hard outer skin and a supporting foam inner element is made. In this case, immediately after the shaping of the haxed outer skin, the foam inner element is produced by injecting self-hardening plasticohaura into the cavity enclosed by the outer skin. This method is economically applicable only in the production of high Stuokzahlen. The tool-side effort is very hooh.

From DE-OS 2 ^ 551 ^ 1 a method for producing a plastic bicycle frame can be removed, naoh the two mirror-image Halbsohalen be made form-bound, which are then joined duroh bolt, Kunststoffsohweißen or Kloben to the complete frame. For stiffening the frame can thereafter injected into the cavity enclosed by the halfsohalen a resoaking component or inserted with cells plastic filler, A disadvantage of the method is that the support core thus formed can not enter into a permanently solid connection with the Außensohale and naoh short load duration Abltiseereoheinungen zwisohen halfsohaleninnenseite and outer surface supporting core occur. In addition, during the injection, the halfsohals and the supporting core are capable of dispersing the halfsohals as long as the solidification thereof is complete, resulting in a high load on the junctions of the halfsohals, which are very compact and very difficult expensive forms must be compensated »

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Aim of the invention

The aim of the invention is to provide a method for producing a profiled be bot carrying Plastrahroens for a bicycle, especially a racing bike, in such a way that with minimal use of material; and high strength of the frame is achievable with little production effort,

Explanation of the essence of the invention:

It is an object of the present invention to provide a method for producing a profiled, lumbar support for a bicycle, in particular a racing bicycle, which enables the production of extremely strong and light frames and a defect-free connection of all frame members,

According to the invention, the object is achieved in that two symmetrical, the outer rear uiit detected main frame elements and two symmetrical inner rear elements, which together form the high-strength outer skin, molded in a conventional manner molded from Kunststoffgewe.be and resin are dimensionally prefabricated, In The resulting pre-strengthened Rahmonelemente are core moments, preferably auo honeycomb-shaped plastic, glued sandwiched, wherein the first Sohioht honeycomb material firmly bonded to the inner surface of the respective Rahmenentententes and the juxtaposed Sohiohten honeycomb material firmly together and successively under vacuum. The honeycomb-shaped sohiohten are gesgesohnitten so that they easily horausragen from the respective frame element, wherein the support core elements are plangosohliffen after their solidification to the dimension of the respective Rahinenelementes · Am? Chiießoud was first the inner Hülntermontemonte with the outer Hintorbau the respective main frame elements and danaoh the Hauptrahiuonelemente verproßt to the complete frame, immediately before it on one of the symmetrical frame and support core elements, a Verbindungssohioht, preferably made of Kunstharzgetränktem plastic fabric, is arranged. This pre-pressing takes place in a known manner, wherein the frame and support core elements are very Maßgonau as long compressed until the Vorblndungsschlcht is pre-consolidated,

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Example:

The invention will be explained in more detail below with reference to an exemplary embodiment. Show Xa of the corresponding Zeiohnung!

1: the side view of the naoh manufactured by the process plastic frame for a train racing bike,

Fig. 2i the Draufsioht the plastic frame naoh Fig »1 and

Fig. 3t shows the cross section of the upper main frame tube of Plastrahmetis.

The plastic frame produced according to the method is composed of two symmetrical rear frame with the main frame elements 4j 5 and two symmotrisohen inner Hinteibauelementen 6 j 7 », which together form the hard and hoohfeste outer skin composed. In the space enclosed by the outer skin, a support core is arranged from a plurality of support core elements, whereby framework and supporting core elements are divided in an analogous manner *

The Rauptrahmenelernente Uj 5, where the outer rear triangle is formed with, and the inner rear elements are molded into known Welse plastic fabric and resin preformed and dimensionally accurate, Naoh their solidification are sandwiohartig incorporated into the frame «· elements StUtzkernelemente. The floors are preferably made of honeycomb material, being built up one after the other and individually pressed under vacuum. The first phase of the support elements becomes fixed to the inner surface of the respective frame element and the successive superposed layers are firmly bonded to each other, so that they are easily adhered to the frame elements via the plane of the dimensionally manufactured frame elements protrude, wherein the Stutzkernoleinente are plahohllffen naoh their solidification to the extent of the respective frame element. Subsequently, on each one of the symmetrical frame and support core elements, a connection horn 9 'is arranged, after which, i. E. Prior to solidifying the Verbindungssohioht 9 'first the frame and Stützkerneleaiente the rear triangle and then the main frame elements Uj 5 and their StUtzkernelemente be vorpreßt to the complete bicycle frame. This

follows, "known manner, with the frame and Stützkernelemonte are pressed together very accurately * Duroh arrangement of Vex · - connection 9s' ensures that machining tolerances of planohleifen compensated, defects in bonding excluded and thus an extremely strong connection of all frame and Supporting nucleus monster has been srreioht.

The plastrahmon so hergasteilteilte shows next to the profiled rear triangle three prülierte Hauptrahmenrohi'e 1j 2j 3 on _t of deneiA always jewoi L?: Wei meet in Knotenbereichon 9.

In the Knotcuibereichen 9 the other Funlctionselomento the bicycle frame, such as steering head and bottom bracket sleeve, dropout sound and seat clamp are arranged in a known manner,

Claims (3)

Erfindungsanspruoh A method for plotting a profiled self-supporting plastic bridge for a bicycle, in particular a racing bicycle, in which prefabricated synunetrisoah Rahinenelemente are glued together, characterized r] adurch ₍ that two symmetrical, the outer rear end ntiterfassondo main trellis elements (Uj 5) and two symmetrical inner rear elements, which together form the hoohfeste outer skin, molded in a known manner and dimensionally vorg-afortigt that in this Rahmonelemente Stützkomolemente saxulwiohartig be incorporated, the Sohiohten the Stützkeniele successively arranged over the inner surface of the frame members and individually under vacuum vorpreßt that the Stützkerneleiuente be plattenohliffen after solidification to the extent of the respective Ralimenelementes that danaoh on each of the symmetrical frame and ^{Stützkernelemento} a Verbindungssohioht ( ^Ql ) is arranged and before the solidification of the Verbind first the frame and support core elements of the rear structure and then the main frame elements and their supporting core elements have been glued to each other dimensionally accurate, 2, method according to item 1, characterized in that the layers of Stützkernos are constructed of honeycomb plastic material, 3, method under point 1, characterized daduroh that as Verbindungssohioht (9 ¹ ) resin impregnated fabric fabric is used. For this purpose -ή page drawings