B - Operations – Transporting – 29 – D
Patent
B - Operations, Transporting
29
D
18/1005, 154/7
B29D 29/08 (2006.01) F16G 1/28 (2006.01)
Patent
CA 1136822
ABSTRACT OF THE DISCLOSURE A method is provided herein for building an improved positive drive power transmission belt having a plurality of alternating grooves and teeth for meshing with the teeth of a pulley, the drive belt being provided with reinforcing fibers distributed through at least a portion of each tooth. An improved apparatus for building such a belt is also provided herein. The method includes the steps of: wrapping a tooth- covering fabric around a cylindrical mold which has circumferentially spaced alternating axial grooves and ridges; wrapping a layer of fiber- loaded elastomeric material around the covering fabric; applying pressure in a helical fashion against the elastomeric layer with a pressure- applying member to force at least a portion of both the fiber-loaded elastomeric material and the fabric into the axial grooves and to move a portion of the fiber-loaded elastomeric material away from the fabric in the area of the ridges to allow a later-wound load-carrying cord to lie against the fabric in the area of the ridges; winding a load-carrying cord in helical fashion and in a plurality of turns against the layer of the fiber-loaded elastomeric material; wrapping a layer of elastomeric material over the load-carrying cord to define an assembly; and vulcanizing the assembly under heat and pressure; wherein the pressure applying step and the winding step are carried out simultaneously with the cord being helically wound on a next succeeding turn following the application of pressure in the helical fashion. Such method provides belts with a greater degree of length control than those made by the tooth preform method; and provides belts having greater strength and modulus of the belt teeth than those provided by the flow-through method.
338511
Dayco Corporation
Marcus & Associates
LandOfFree
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