Abstract: A tire retreading tube for use with a tire retreading rim formed from a pair of axially-adjacent rim sections, one of the sections having a cutout for the reception of the valve stem extending from the tube body and being formed with threads adjacent the tube. The tube has an extension of generally cylindrical form through which the stem extends, so that the extension surrounds the portion of the stem adjacent the tube, and functions as a spacer element and is effective to limit movement of the stem and the tube relatively to the rim section. Suitably, the spacer element threadedly engages the stem adjacent the tube, has a body which essentially fills the cutout circumferentially, and has end flanges to overlie the adjacent faces of the rim section with which it is to be associated.

Abstract: A retreading envelope is produced by extruding an elastomeric material in substantially tubular form, with portions of the wall thickness of the circumference of the extruded tubing being of a thickness substantially greater than the wall thickness of the remainder of the tubing, cutting a length of the extruded tubing from the tubing as extruded, and butt-seaming the free ends of the cut length to form an annular tube substantially of circular cross-section, with the thickened wall portions of the extruded length in the area of its outer periphery. The elastomeric material in the thickened wall portions of the annular tube is then caused, e.g.

Abstract: A tire retreading tube for use with a tire retreading rim formed from a pair of axially-adjacent rim sections, one of said sections having a cutout for the reception of the valve stem extending from the tube body and being formed with threads adjacent the tube. The tube has an extension of generally cylindrical form through which the stem extends, so that the extension surrounds the portion of the stem adjacent the tube, and functions as a spacer element and is effective to limit movement of the stem and the tube relatively to the rim section. Suitably, the spacer element threadedly engages the stem adjacent the tube, has a body which essentially fills the cutout circumferentially, and has end flanges to overlie the adjacent faces of the rim section with which it is to be associated.

Abstract: A tire retreading tube for use with a tire retreading rim formed from a pair of axially-adjacent rim sections, one of said sections having a cutout for the reception of the valve stem extending from the tube body and being formed with threads adjacent the tube. The tube is formed with an integral extension of generally cylindrical form through which the stem extends, so that the extension surrounds the portion of the stem adjacent the tube, and a nut engaging the threads on the stem and cooperating with an underlying washer is effective to pull the extension into the rim cutout and draw the tube against it.

Abstract: In combination with a tire casing, including a pre-formed, pre-cured, or uncured tread disposed about its periphery, and a curing envelope covering said tread and at least the outwardly facing side walls and bead portion of the tire casing, means are disclosed for effecting a tight and uniform seal between the said curing envelope and tire casing. These comprise a pair of annular sealing members, each having a central hub and a peripheral circumferential surface adapted to engage with the bead portion of the tire casing; a pair of unitary backing members, each having a central hub and portions at equal radial distances from the said hub which are engageable with the inwardly facing peripheral edge of said tire casing; and threaded fastener means extending between each said annular member and said backing member to enable the annular and backing members to be drawn toward one another to effect a clamping action between the members and intervening envelope and tire bead as the members are drawn together.