Power transmission belt, reinforcement and process

Claim 2

In a power transmission belt having a body section, the improvement comprising: a tensile section of cord disposed in the body section, the cord including twisted multifilaments and a plurality of disassociated filaments defining end portions extending exteriorly of the cord into the body section forming a mechanical bond therewith.

Claim 3

A power transmission belt as set forth in claim 1 comprising: overcord and undercord sections of castable material which constitutes the body section; and spirally wound cord disposed between the overcord and undercord sections and which constitutes the tensile section, the cord treated with a chemical agent that forms a chemical bond between the body section, and cord including exteriorly extending end portions.

Claim 4

A power transmission belt as set forth in claim 1 comprising: overcord and undercord sections including thermosetting rubber material which constitutes the body section; and spirally wound cord disposed between the overcord and undercord and which constitutes the tensile section, the cord treated with a chemical agent and an adhesive, the end portions extending into the adhesive forming a chemical and mechanical bond therewith, and the adhesive forming a bond with the overcord and undercord sections.

Claim 5

Cord adapted for use as a tensile member in power transmission belting comprising: a plurality of continuous synthetic filaments twisted together to define a strand; a plurality of strands twisted together to define a cord; a chemical agent applied to the cord; and a plurality of random length filaments disassociated from the strands to define a plurality of end portions extending exteriorly of the cord.

Claim 6

Cord adapted for use as a tensile member in power transmission belting comprising: a plurality of continuous synthetic filaments twisted together to define a strand; a plurality of strands twisted together to define a cord; a chemical agent applied to the cord; and a plurality of random length filaments disassociated from the strands to define a plurality of end portions extending exteriorly of the cord.

Claim 7

Cord as set forth in claim 4 wherein the synthetic filaments are polyester.

Claim 8

Cord as set forth in claim 4 wherein the chemical agent is a polyisocyanate solution.

Claim 9

A power transmission belt of the V-type having bevel cut sidewall portions comprising: a body section including overcord and undercord sections; a tensile section of spirally wound cord disposed between the undercord and overcord sections, the cord having bevel cut edges exposed at the belt sidewall portions and the cord including a plurality of continuous filaments twisted together to define strands, the strands twisted together to define a cord, and a plurality of filaments disassociated from the cord to define a plurality of filament end portions extending exteriorly into a portion of body section mechanically bonding therewith, the uncut portions of the bevel cut edge cord at least partially mechanically retained in the body section by the filament end portions.

Claim 10

A power transmission belt of the V-type having bevel cut sidewall portions comprising: a body section including overcord and undercord sections; a tensile section of spirally wound cord disposed between the undercord and overcord sections, the cord having bevel cut edges exposed at the belt sidewall portions and the cord including a plurality of continuous filaments twisted together to define strands, the strands twisted together to define a cord, and a plurality of filaments disassociated from the cord to define a plurality of filament end portions extending exteriorly into a portion of body section mechanically bonding therewith, the uncut portions of the bevel cut edge cord at least partially mechanically retained in the body section by the filament end portions.

Claim 11

A power transmission belt as set forth in claim 7 and further comprIsing a chemical agent applied to the cord, the agent increasing the bend modulus of the cord and simultaneously effecting chemical bonding between the cord, end portions and body section.

Claim 12

A power transmission belt as set forth in claim 7 in which the body portion is at least partially polyurethane.

Claim 13

A process for preparing cord for use as a tensile member in power transmission belts, the process of the type having steps of spinning greige continuous synthetic filaments, twisting the filaments into strands, and twisting the strands into multi-filament cords, wherein the improvement comprises the steps of: treating the cord with a chemical bonding agent solution; disassociating portions of filaments from the cord defining a plurality of filament end portions extending exteriorly from the cord.

Claim 14

A process for preparing cord for use as a tensile member in power transmission belts, the process of the type having steps of spinning greige continuous synthetic filaments, twisting the filaments into strands, and twisting the strands into multi-filament cords, wherein the improvement comprises the steps of: treating the cord with a chemical bonding agent solution; disassociating portions of filaments from the cord defining a plurality of filament end portions extending exteriorly from the cord.

Claim 15

In a process for making power transmission belts of the type having the steps of chemically treating a multifilament greige cord, spirally winding the cord on a first cylindrical mold half, placing the first mold half within a second cylindrical mold half to define a mold cavity therebetween, and filling the mold cavity with castable material, the improvement comprising, after the step of chemically treating, the steps of: abrading the cord, disassociating a plurality of filaments to define a plurality of filament end portions extending exteriorly from the cord; and casting material around filament end portions establishing mechanical bonding therewith.

Claim 16

In a process for making power transmission belts of the type having the steps of chemically treating a multifilament greige cord, spirally winding the cord on a first cylindrical mold half, placing the first mold half within a second cylindrical mold half to define a mold cavity therebetween, and filling the mold cavity with castable material, the improvement comprising, after the step of chemically treating, the steps of: abrading the cord, disassociating a plurality of filaments to define a plurality of filament end portions extending exteriorly from the cord; and casting material around filament end portions establishing mechanical bonding therewith.