A hose has an extruded tube formed of a blend of polyethylene and butyl rubber, a braided external reinforcement layer and a film applied by coating to unify and give dimensional stability to the elements of the cover. The hose is used in LP gas installations due to the non-leaching and heat-resistant characteristics of the tube material.
This is a continuation of application Ser. No. 271,460 filed July 13, 1972 which was a continuation-in-part of earlier application Ser. No. 96,987, filed Dec. 10, 1970, both now abandoned, which is relied upon and the entire disclosure and specification of which is hereby incorporated by reference.
A high strength flexible hose for conveying fluids under pressure wherein the hose includes a synthetic thermoplastic polymeric core tube, one or more inner reinforcing layers of a high strength aramid yarn having a section modulus of over 400 grams per denier and a tenacity of more than 15 grams per denier at room temperature, and one or more outer reinforcing layers of metal wire.
A thermoplastic hose is disclosed in which a reinforcement layer is made fom a combination of yarns and monofilaments to provide stereo interstices where mechanical bonds between the reinforcement and its adjacent element of the hose can be established.
A brake hose includes two reinforcing layers in a rubber base. The brake hose comprises an inner tube rubber layer having a flow path for flowing fluid, a lower yarn layer formed by braiding first yarns around the inner tube rubber layer and an upper yarn layer formed by braiding second yarns around the lower yarn layer and a cover rubber layer covering the upper yarn layer. A lower yarn layer duty LD given by the equation, LD(%)=(LRP/PRP).times.100, has a value of 50-65%, where LRP denotes an inner pressure at which a brake hose without the upper yarn layer and the cover would burst, and PRP denotes an inner pressure at which the brake hose would burst.
A brake hose has an inner tube layer made from a rubber material, a lower thread layer made of braided lower threads, an intermediate rubber layer, an upper thread layer made of braided upper threads, and a skin rubber layer. The lower thread layer is constituted by lower threads each having a first adhesive thin film adhesively bonded to the inner tube layer and to the intermediate rubber layer. The upper thread layer is constituted by upper threads each having a second adhesive thin film adhesively bonded to the intermediate rubber layer and to the skin rubber layer.
5316046 - Power steering hose - Owned by The Yokohama Rubber Co., Ltd. (JP) [*] Notice:The portion of the term of this patent subsequent to October 3, 2006 has been disclaimed.
High performance hoses are disclosed which are characterized by enhanced heat resistance, leading to prolonged service life, and hence are suitable for use in automobile power steering units. Inner tubes are formed of hydrogenated acrylonitrile/butadiene copolymer rubbers of a selected composition. The inner tubes may be of a double-layered construction composed of an inner layer of hydrogenated acrylonitrile/butadiene copolymer rubber and an outer layer of rubber composition which comprises specified amounts of a selected class of sulfurs, organic peroxide and triazine compounds combined with selected sulfur-curable base rubbers.
