Abstract: A tire has a tread with circumferentially extending ribs separated by a circumferentially extending zig-zag groove. The depth of the groove varies in the circumferential direction of the tire and is at a maximum at the vertex of each projecting angle of a rib, and at a minimum at the vertex of each reentrant angle of a rib.

Abstract: The present invention relates to a cure system for a sulfur vulcanizable rubber. The cure system comprises:(a) from about 0.50 to about 2.0 phr of a sulfenamide accelerator selected from the group consisting of N-oxydiethylene benzothiazole-2 sulfenamide, N-cyclohexyl-2-benzothiazole sulfenamide, N-t-butyl-2-benzothiazole sulfenamide and N-oxydiethylene-thiocarbamyl-N'-oxydiethylene sulfenamide;(b) from about 0.10 to about 1.0 phr of a guanidine accelerator selected from the group consisting of diphenyl guanidine and di-ortho-tolylguanidine;(c) from about 0.10 to about 1.0 phr of a thiuram accelerator selected from the group consisting of tetraethyl thiuramdisulfide, tetramethyl thiuram monosulfide, tetramethyl thiuramdisulfide;(d) from about 0.05 to about 1.0 phr of mercapto benzothiazyl disulfide;(e) from about 0.75 to about 3.0 phr of a sulfur vulcanizing agent;(f) from about 0.05 to about 0.50 phr of N-cyclohexylthio-phthalimide;(g) from about 1.0 to about 5.

Abstract: A segmental drum (10) has spaced-apart inflatable turnup bladders (24) for folding each edge (28) of a belt (30) applied to the drum (10). The spacing of the bladders (24) is adjustable by axial movement in opposite directions of central hub assemblies (42,44) threaded on screws (76). Fine adjustment of the spacing to straigten the fold line (32) of each bladder (24) is provided by axial adjustment of rigid polyurethane bladder support brackets (18) connected to the central hub assemblies (42,44). Radial expansion of the segments (16) is provided by links (84) between each of the segments (16) and spaced drum expanding hub assemblies (86,88) threaded on a drum control screw (96). A molded central filler block (62) of rigid polyurethane is mounted on each segment (16) to fill the space between the bladder support brackets (18).

Abstract: A method of manufacturing a closed, hollow toroidal structure having a rigid internal annular plate includes treating one annular surface of the plate with a release coating, applying to the other annular surface of the plate an adhesion promoting coating and positioning the plate within a mold having a generally toroidal internal cavity. Next, a fluid conduit is juxtaposed partially within the internal cavity of the mold adjacent to the annular plate and partially outside the internal cavity of the mold. The mold cavity is then filled with an elastomer followed by curing under heat and pressure.

Abstract: A pneumatic tire (10) has a tread portion (11) comprising a plurality of circumferentially extending grooves (21,22,23) which divide the tread into axially spaced lands (24,25,26,27). Each land is subdivided into blocks (32X,32Y) by cross-slits (31). The blocks in each land (24,25,26,27) are arranged so that circumferentially adjacent blocks (32X,32Y) are axially offset relative to each other. The cross-slits (31A,31B,31C) in each land alternate circumferentially between axially extending cross-slits (31B) and biased angle cross-slits (31A,31C). The axially extending cross-slits (31B) are sipes and the biased angle cross-slits (31A,31C) may be either sipes or grooves.

Abstract: A viscoelastic fluid molding material is injected into a tire tread cavity between the mold and an inflatable tread supporting body. The clearance distance between the mold and the inflatable tread supporting body is varied to increase the flow of the initial amount of fluid molding material into remote portions of the tire tread cavity and provide for the flow of the final amount of fluid molding material into gate portions while the tread supporting body is being deflected.Circumferentially spaced gates may be spaced from the centerplane of the mold and have runners extending toward the shoulders of the tread supporting body for increased flow of the initial amount of fluid molding material into remote shoulder portions of the tread cavity. Sealing rings at the side edges of the tread cavity prevent flow of fluid molding material into sidewall areas of side members of the mold.

Abstract: Tire coating composition (non-wax) composed of a rubber selected from polybutadiene and/or styrene/butadiene copolymer, carbon black having a large particle size and, preferably, a non-ionic surfactant and use thereof for curing tires. Optionally, the composition can also contain at least one of mica and talc.

Abstract: In a method of fabricating hose, especially in very long unbroken lengths, an elongated core is mounted for rotation without longitudinal displacement and is driven simultaneously at both of its ends at a selected fixed speed. A bobbin having a length of tape wound on it is moved on a carrier along a path parallel to the length of the core, and the tape of the bobbin is wound helically onto the core while the core is rotating and the carrier is moving along the path. There may be plural bobbins, and the carrier may have a platform for a human operator who manipulates the bobbin from which tape is being wound. Tape from selected successive bobbins may be so wound in helical manner.

Abstract: The present invention reveals a polymer alloy which is comprised of (a) at least one highly unsaturated rubbery polymer which is covulcanized with at least one N-chlorothio-sulfonamide modified EPDM rubber and (b) at least one thermoplastic resin. A blend of polypropylene with nitrile rubber which has been cocured with an N-chlorothio-sulfonamide modified EPDM rubber is a representative example of such a polymer alloy.

Abstract: It is often desirable to utilize accelerators in the sulfur vulcanization of unsaturated rubbers. In many cases a primary accelerator is used in combination with another accelerator, called a secondary accelerator or activator, which further increases the rate of vulcanization. It has been determined that compounds having the structural formula:NH.sub.2 --A--NH--(CH.sub.2).sub.x NH].sub.n A--NH.sub.2wherein x is 2 or 3, wherein n is an integer from 1 to 100, and wherein A represents an alkylene group containing from 1 to 20 carbons atoms, act as secondary accelerators in the vulcanization of unsaturated rubbers. For example, it has been determined that 4,7-diaza-decane-1,10-diamine is a particularly desirable secondary accelerator.

Abstract: A segmental drum (10) has a plurality of axially extending circumferentially spaced segments (36) with flexible connections (56) to shoulder pistons (32) at opposite ends of each segment (36). Wedge shaped bars (62) are positioned between the segments (36) and connected to center pistons (64) for urging tapered side faces (80) of the bars (62) into engagement with sloping side faces (78) of the segments (36). Elastic turnup bladders (42) are positioned outward of the segments (36) with nose portions (40) overlapping the ends of the segments (36) for resiliently returning the segments (36) and bars (62) to a retracted condition after expansion by radially outward movement of the shoulder pistons (32) and center pistons (64).

Abstract: A bumper assembly to protect a marine or related dock from vessels or vehicles composed of a bumper strip of ultra-high molecular weight preferably 3.5 to 6 million molecular weight polyethylene covering a mass of rubber attached to the dock wall.

Abstract: A self-emulsifiable resin powder can be dispersed in water without utilizing additional surfactants or expanding large amounts of mechanical energy. Such self-emulsifiable resin powders offer numerous distinct advantages over conventional latices. One of the most important benefits that is realized by utilizing self-emulsifiable resin powders is that they can be shipped dry which is the equivalent to shipping a latex with a 100 percent solids content. In other words, such self-emulsifiable resin powders eliminate the necessity for shipping water in latices. The self-emulsifiable resin powders disclosed herein also have the advantage of having low carboxyl contents and of being dispersible into aqueous systems which contain virtually no surfactants. These self-emulsifiable resins contain a relatively small proportion of repeat units which are derived from both acrylic acid and methacrylic acid.

Abstract: A pneumatic tire has first and second carcass plies. The first carcass ply has outer portions that are folded around axially spaced annular tensile members (bead cores) and terminate under a belt structure. A pair of shoulder plies are disposed in the upper sidewalls of the tire between the central portion of the second carcass ply and the lateral edge portions of the first carcass ply. A pair of lower sidewall plies are disposed in the lower sidewalls, and are folded around their respective annular tensile members, terminating radially inwardly of the axially widest part of the tire.

Abstract: A conveyor belt (10) having an electrically conductive sensor (20) or antenna embedded therein. The conductor (20) has a copper core having a plurality of stainless steel filaments wrapped together to form a strand or a cable. The conductor has a low profile cross section making it suitable for use in thin belts. The conductor is formed in a repeating sine wave to aid in flexibility. The conductor/belt is especially useful in conveyor rip detection systems.

Abstract: A die supporting ring member (67) is removably supported in an opening (20) of a surrounding frame (12). Pusher members (24,26) are positioned around the die supporting ring member (67) with sloping surfaces (28,30) in engagement with the circumferentially spaced dies (72) in the ring member (67). The sloping surfaces (28,30) are also engageable with sloped surfaces (32,34) in the frame opening (20). A piston and cylinder assembly (38) is mounted on the frame (12) for moving the pusher members (24,26) toward one side of the opening (20) causing them to slide along the sloping surfaces (32,34) in the frame opening (20) and move the dies (72) radially inward to crimp a tubular fitting positioned within the die supporting ring member (67).