| 摘要 |
A pre-cured tread stock for re-capping a vehicle tire and a method for retaining the tread tightly in place on the peripheral surface of the tire casing during the curing of the tread onto the casing under heat and pressure. The tread cross-section includes a central portion and a longitudinally extending groove at each side near the respective edge or "wing", the grooves extending circumferentially around the tire casing when the tread is wrapped around and "stitched" to the casing. The grooves are of such shape that when the tread is laterally curved to fit a buffed tire casing, the outer and-lower sides of the grooves extend generally upwardly in a hook-shaped profile. The method includes the steps of(1) placing a retainer around the tread-stock in each of the grooves after the tread stock is wrapped around and stitched to the tire casing; (2) alternatively, (a) reducing the diameter of substantially inextensible retainers such as steel wire by tightening them against the outer sides of the grooves to squeeze the wings of the tread radially inwardly relative to and tightly against the casing and to hold them in place during the curing or (b) using resilient loop retainers which are expanded, laid in the grooves and then retract to squeeze the wings against the casing or (c) using retainers made of a material which shrinks upon heating so as to even more tightly squeeze the tread wings against the casing at the start of the curing process; (3) curing the tread stock to the casing; (4) removing the retainers after the assembly is cured and; (5) buffing or cutting off the hook-shaped material forming the lower sides of the grooves. |
