Abstracts of patents US patent abstracts are prepared by Dr R.J. Hand of the University of Sheffield, UK
US PATENTS COMPONENTS Reinforcing laminate for tyre and heavy duty pneumatic radial tyre using the same Harakon, K. and Yamada, S. (Bridgestone Corporation, Tokyo, Japan) US Pat 4 890 659
Fibre reinforced resin sheets Su, K.-Y.B. (E.I. Du Pont de Nemours and Company, Wilmington, DE, USA) US Pat 4 892 722 (9January 1990) A composite structure for forming into a shaped article consists of a resin matrix sheet reinforced with unidirectional fibres, each fibre having alternating straight and excess length sections.
(2 January 1990) The carcass portion of the tyre consists of plies of rubber-coated cords arranged parallel to the axial direction of the tyre. At least two belt layers containing at least one helically wound cord are superimposed about a crown portion of this carcass.
Bottle grade polyester resins reinforced with glass fibres and containers made of such resins Duse, D. (Bergamo, Italy) US Pat 4 892 762 (9 January 1990) A container is made with glass fibrereinforced polyester resins and is moulded by stretch-blow moulding.
Games racket Haines, R.C. (Dunlop Limited, UK) US Pat
Cables for reinforcing deformable articles and articles reinforced by said cables Reuter, R.F. and Welter, T.N.H. (The Goodyear Tire and Rubber Company, Akron, OH, USA) US Pat 4 893 665 (16 January 1990) A cable is claimed with at least two yarns comprised only of aramid filaments. These two yarns are adjacently twisted about a single core yarn which consists of at least one filament of either partially orientated polyimide or polyester. The denier of the core yarn is 5-30% of the sum of the deniers of the aramid yarns and at least 4 g per denier are required to elongate the core yarn to 107% of its initial length. The cable has a twist multiplier of 5-12 and the ratio of twist in the aramid fibres to the twist in the cable is from 1 to 2.
4891 175 (2January 1990) A frame for a games racket has a hollow head and shaft consisting of a filament-reinforced thermoplastic. It is produced by injecting the thermoplastic into a suitable mould, the core of which is fusible, located by pins and has a melting point below the injection temperature. Following moulding the temperature is raised such that the core melts and can therefore be removed without distortion of the moulding. ComlmSlte transom structure Davidson, S.L. (Mastercrafters Corporation, Winnsboro, LA, USA) US Pat 4 892 054 (9
January 1990) A wall portion of a boat on which a drive unit is to be attached consists of a stiff grid structure with ribbing defining sections which are filled with a hardened filler material. Fibreglass layers are placed on opposite sides of the grid and are bonded together with the filler material, so that at least one fibre glass layer extends over the joint between the wall and the hull and is chemically bonded to them, thus securing them together. Bearing with composite load bearing surfaces Hofgren, J.M. (Gainesville, FL, USA) US Pat 4 892 421 (9January 1990) A bearing for a rotating shaft is described in which the rolling members are held in races with a thin layer of fibre-reinforced elastomeric material capable of rapid and complete recovery from deflections between the rolling members and the races. Blade of compnsite materials and its man,facturing process Barbier, B.J.M. and Michaud-Soret, J.A. (Aerospatiale Societe Nationale Industrielle, Paris, France) US Pat 4 892 462 (9 January 1990) A blade of composite materials which can be used in the rear rotor of a helicopter includes a shell portion and a spar, both manufactured from a fibre-reinforced polymerized synthetic resin. In the shell the fibres are supplied in fabric form, whilst in the spar the fibres are in an elongated bundle.
Strengthened buffered optical fibre Claxton, J.D., Scheidt, G.A. and Shores, S.C. (AT & T Bell Laboratories and AT & T Technologies, N J, USA) US Pat 4 893 893 (16 January 1990) A buffered optical fibre is strengthened by at least one fibrous strength member that is contact with the coating layer of the fibre and covers a substantial proportion of its periphery. A plastic buffer layer is placed round this strength member in compression so that microbending losses are avoided when the fibre is subjected to a predetermined temperature range. Interlocking structural members utiUsing overlying composite strips Anderson, R.E. (Grumman Aerospace Corporation, Bethpage, NY, USA) US Pat 4 893 954 (16 January 1990) The joint consists of three laminate sections, the first of which has an alternating sequence of first, second and third plies all of which have a series of spaced parallel strips raised at intermediate points to form a projection. The strips of the first and third plies lie parallel and adjacent to each other whilst the strips of the second plies are perpendicular to those of the first. These strips are received by spaced recesses in the second laminate section which has an elongated base section. The third laminate section is in the form of a bar and is
placed between the projections and the base section to secure the engagement of the first and second laminates. Method of forming a composite leaf spring with fabric wear pad Richard, D.S., Mutzner, J.E., Eilerman, J.F. and Rau, T.E. (General Motors Corporation, Detroit, MI, USA) US Pat 4 894 108 (16
January 1990) A synthetic double plane weave fabric pad with 70-90 picks/inch in the warp direction and 10-14 picks/inch in the weft direction is placed in the mould to form an end of the spring, the warp direction being placed longitudinally along the spring. Fibres coated with adhesive are placed in layers over the pad in the mould. Heat and pressure is applied to cure the spring and to bond the fabric pad to it, thus giving a spring with a wear surface at the end. Axle mount construction for a fibre reinforced resin leaf spring Schoof, W.W. and Wessel, J.L. (A.O. Smith Corporation, Milwaukee, WI, USA) US Pat 4 895 350 (23 January 1990) A mounting construction for attaching a fibre-reinforced resin leaf spring to a vehicle is described which consists of two clamping members which define a channel in which is placed a resilient insert and the spring. Tension-compression stay with fibrereinforced synthetic resin material strut Devaud, J.-M. (Ciba-Geigy Corporation, Ardsley, NY, USA) US Pat 4 895 351 (23
January 1990) A tension-compression stay comprises a synthetic resin tubular strut reinforced with high rigidity fibres. Metal force-introducing elements are screwed onto either end of the strut: the screw thread is on the outside of the metal shaft and self-threads onto the inner wall of the tubular strut. Equalising stress distribution in each laminate of an asymmetrically loaded elastomeric bearing Byrnes, F.E. (United Technologies Corporation, Hartford, CT, USA) US Pat 4 895 354
(23 January 1990) A spherical elastomeric bearing consists of alternate laminates of elastomeric material and a non-resilient material disposed at increasing radii from the centrepoint. An elliptical hole passes through each laminate normal to a bearing axis through the centrepoint. Fastener with floating nut for use with composite structure Wilcox, J.G. (Deutsch Fastener Corp, Lakewood, CA, USA) US Pat 4 895 484 (23
January 1990) A fastener unit comprises a nut, a retainer and a composite non-metallic channel that can be connected to a supporting structure. The retainer holds the nut in such a fashion that it can be removed from and replaced in