GB896132A - Rubber valve - Google Patents

Abstract

896,132. Valves. GOODYEAR TIBE & RUBBER CO. Sept. 7, 1959 [Oct. 20, 1958], No. 30482/59. Class 135. [Also in Group XXXIV] An inflation valve for a tubeless tyre and suitable for insertion in a hole in the wheel rim or in the wall of the tyre consists of a flanged plug 2 of relatively soft _ rubber with a slit 6 for the insertion of an inflating needle, and a sheath 5 having a substantially greater resistance to cutting and abrasion to resist the cutting action of the tyre cords when the valve is mounted in the tyre. In one form the sheath is of rubber compounded to offer high resistance to abrasion and cutting but sufficiently pliable to permit the radial compression and elongation that accompany the insertion of the valve into the hole in the rim or tyre. In other forms the sheath is of lengths of single stranded or cabled wire or cords, preferably monofilament cords of synthetic material, laid around the plug with their axes parallel to that of the plug and embedded in the soft rubber of the plug or in a layer of harder rubber. Alternatively, the wire or cords may be wound spirally in one or two layers or woven fabric laid on the bias may be used, and the sheath may be extended along the facing sides of the flanges 3, 4 and around the periphery of the flange 3. In another form, the sheath consists of flocculent material with its greatest dimension lengthwise of the plug and embedded in a layer of harder rubber. Any of the above forms of sheath may be employed in a further arrangement in which the ends of the sheath are partially embedded in the flanges 3, 4. The slit 6 may be formed initially to extend only from the outer flange 3 to a point corresponding to the inner end of the sheath so that the plug can be stretched axially by a blunt-ended rod to facilitate its insertion into the rim or tyre wall after which the slit may be completed by the use of a cutting tool.