Ciba-geigy Corporation

Alfred Puck

Peter Voirol

A process for producing reinforced plastics tube for use, inter alia, as a transmission shaft wherein the tube is produced by winding on to a core reinforcing fibres preferably of carbon impregnated with a curable plastics at predetermined winding angles &lt;35.degree. and then winding on to the reinforcing fibres at angles between .+-.80.degree. and .+-.90.degree. a peripheral winding of a material which is relatively resilient with respect to the reinforcing fibres and which has a high coefficient of thermal expansion. The tube so formed is then heat cured. Fittings are secured to the ends of the tube and the ends may be reinforced with a carbon fibre structure.

Fibre reinforced plastics power transmission shaft

The carbon fibre reinforced plastics tube (1) is provided at each end with a cemented-in sleeve (2) and a cemented-on sleeve (3) made of the same material and having the same anisotropy behaviour. A fitting (4) is inserted into each end of the tube to introduce a torque and is secured by bolts (5). The bolts are secured by a sleeve (6). The securing of the fittings by bolts and the adapted structure of the wall reinforcements ensure a safe introduction of torque, even into extremely anisotropic tubes.

Power transmission shaft

A method of manufacturing a glass fibre reinforced pipe by winding a first resin impregnated pipe layer of glass fibres oriented approximately in the circumferential direction and setting the layer so formed. The set first pipe layer is then subjected to axial pressure loading by an external force and a pressure medium from inside. A second resin impregnated pipe layer having glass fibres extending approximately in the axial direction is then applied to the loaded first pipe layer, and set. After setting, the external pressure force and the pressure medium are removed so that a residual stress or prestress condition forms in the finished pipe.

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Basel, Switzerland

Alfred Puck