GB942020A - Improvements in or relating to vehicle tyres - Google Patents

Abstract

942,020. Tyre treads. CONTINENTAL GUMMI-WERKE A.G. March 3, 1960 [March 21, 1959], No. 7544/60. Heading B7C. A tyre tread comprises circumferentially alternating directly adjacent sections a and b of substantially equal circumferential length and each extending across the full transverse width of the tread, the sections a comprising traction blocks or ribs effective, say, on soft ground, and the sections b comprising a plurality of blocks which are separated by grooves and are circumferentially narrower than the ribs of sections a to provide a profile effective on, say, hard road surfaces. Fig. 1 shows the sections a comprising transversely disposed chevon-shaped ribs 2 separated by grooves 3, with the sections b composed of narrower transverse chevron ribs 4 separated by transverse grooves 5 and broken by circumferential grooves 5<SP>1</SP>. Fig. 5 shows a tread comprising circumferential zig-zag ribs 6 which are continuous in sections a, and some of which are broken into blocks 12 by transverse grooves 11 in sections b, the blocks 12 having carborundum granules 13 embedded therein. Wire helices 14 may be embedded in the continuous rib portions of the section b. Fig. 4 shows a solid tyre comprising a tread of alternating sections a and b of wide and narrow transverse ribs 2, 4 respectively. Recesses 10 are provided in the radially inner surface of the tyre below the sections b.