Circular side positive drive belt teeth

Claim 2

An endless synchronous drive belt formed of a resilient elastomer comprising: at least one high elastic modulus reinforcing member extending along said belt thereby defining a pitch line; a succession of identical teeth uniformly spaced apart by their pitch P and possessing a notional tooth width W, less than P; each tooth having substantially identical fore and an aft surfaces with at least part of said fore and aft surfacEs shaped in cross section as the arc of a circle of radius W; both said arcs being centered on the pitch line at centers spaced at a distance W apart.

Claim 3

An endless synchronous drive belt as claimed in claim 1 in which the ratio W:P lies between 0.33:1 and 0.8:1.

Claim 4

An endless synchronous drive belt as claimed in claim 1 wherein P is from 2 mm. to 30 mm.

Claim 5

An endless synchronous drive belt as claimed in claim 1 wherein said fore and aft surfaces are reinforced with abrasion-resistant fabric.

Claim 6

The combination of (A) an endless synchronous drive belt formed of a resilient elastomer comprising: at least one high elastic modulus reinforcing member extending along said belt thereby defining a pitch line; a succession of identical teeth uniformly spaced apart by their pitch P and possessing a notional tooth width W, less than P; each tooth having substantially identical fore and an aft surfaces with at least part of said fore and aft surfaces shaped in cross section as the arc of a circle of radius W; both said arcs being centered on the pitch line at centers spaced at a distance W apart and (B) a pulley having a plurality of identical peripheral belt-engaging teeth defining between them pulley cavities; wherein each pulley cavity possesses substantially identical fore and aft surfaces, at least part of which surfaces are shaped in cross-section as the arc of a circle of radius W + CA where CA is one-half the desired belt tooth: pulley cavity clearance; both said arcs being centered on the pitch circle at centers spaced at a distance W apart, wherein the pitch circle radius is the outer radius of the pulley at the tooth periphery plus the distance between the base of the belt between the teeth, and the belt pitch line.

Claim 7

The combination of (A) an endless synchronous drive belt formed of a resilient elastomer comprising: at least one high elastic modulus reinforcing member extending along said belt thereby defining a pitch line; a succession of identical teeth uniformly spaced apart by their pitch P and possessing a notional tooth width W, less than P; each tooth having substantially identical fore and an aft surfaces with at least part of said fore and aft surfaces shaped in cross section as the arc of a circle of radius W; both said arcs being centered on the pitch line at centers spaced at a distance W apart and (B) a pulley having a plurality of identical peripheral belt-engaging teeth defining between them pulley cavities; wherein each pulley cavity possesses substantially identical fore and aft surfaces, at least part of which surfaces are shaped in cross-section as the arc of a circle of radius W + CA where CA is one-half the desired belt tooth: pulley cavity clearance; both said arcs being centered on the pitch circle at centers spaced at a distance W apart, wherein the pitch circle radius is the outer radius of the pulley at the tooth periphery plus the distance between the base of the belt between the teeth, and the belt pitch line.

Claim 8

The combination of (A) an endless synchronous drive belt formed of a resilient elastomer comprising: at least one high elastic modulus reinforcing member extending along said belt thereby defining a pitch line; a succession of identical teeth uniformly spaced apart by their pitch P and possessing a notional tooth width W, less than P; each tooth having substantially identical fore and an aft surfaces with at least part of said fore and aft surfaces shaped in cross section as the arc of a circle of radius W; both said arcs being centered on the pitch line at centers spaced at a distance W apart and (B) a pulley having a plurality of identical peripheral belt-engaging teeth defining between them pulley cavities; wherein each pulley cavity possesses substantially identical fore and aft surfaces, at least part of which surfaces are shaped in cross section as the arc of a circle of radius W + CB where CB is the desired belt tooth: pulley cavity clearance; both said arcs being centered on the pitch circle at centers spaced at a distance W + CB apart, wherein the pitch circle radius is the outer radius of the pulley at the tooth periphery plus the distance between the base of the belt between the teeth, and the belt pitch line.

Claim 9

The combination of (A) an endless synchronous drive belt formed of a resilient elastomer comprising: at least one high elastic modulus reinforcing member extending along said belt thereby defining a pitch line; a succession of identical teeth uniformly spaced apart by their pitch P and possessing a notional tooth width W, less than P; each tooth having substantially identical fore and an aft surfaces with at least part of said fore and aft surfaces shaped in cross section as the arc of a circle of radius W; both said arcs being centered on the pitch line at centers spaced at a distance W apart and (B) a pulley having a plurality of identical peripheral belt-engaging teeth defining between them pulley cavities; wherein each pulley cavity possesses substantially identical fore and aft surfaces, at least part of which surfaces are shaped in cross section as the arc of a circle of radius W + CB where CB is the desired belt tooth: pulley cavity clearance; both said arcs being centered on the pitch circle at centers spaced at a distance W + CB apart, wherein the pitch circle radius is the outer radius of the pulley at the tooth periphery plus the distance between the base of the belt between the teeth, and the belt pitch line.