Blades for rubber tire rasps

Claim 2

A rasp blade formed from sheet metal and adapted to be mounted with others in a rotatable holder, said blade having a planar body and a convexly curved working edge formed with a plurality of pairs of elongated and finger-like teeth, each tooth when viewed normally to the plane of the body having its tip on said edge and its profile bounded by lines intersecting said edge, the extensions of said lines meeting at a small inclined angle beyond the edge, the teeth of each pair being inclined in the same direction and oppositely to the teeth of the adjacent pairs and having a circular pitch exceeding twice the maximum tooth width, the tips of said teeth being set laterally so as to lie on arcs parallel to and displaced from the plane of the body, there being at least one row of set tips to each side of the body, those teeth having their tips in a row each being oppositely inclined to the teeth next having tips in that row.

Claim 3

A rotary rasp blade formed from sheet metal and adapted to be mounted side by side with like blades inclined oppositely to the teeth a rotatable holder, said blade having a planar body part and a convexly curved outer edge, a single row of elongated similar finger-like teeth formed in the body with the tips of the teeth terminating with lands which are parts of the curved outer edge of said body, said teeth being arranged in pairs, the teeth of each pair being adjacent each other and inclined in the same direction so that each tooth has a straight longitudinal axis which lies at an angle other than 90* to a tangent to the land of that tooth, the teeth of each pair also being inclined oppositely to the teeth of the adjacent pairs, the tips of said teeth being located along at least two transversely spaced arcs of substantially equal curvature there being at least one tooth tip arc to each side of said blade, the teeth having their tips common to an arc each being oppositely inclined to the adjacent teeth having tips common to the same arc.

Claim 4

A rotary rasp blade formed from sheet metal and adapted to be mounted side by side with like blades inclined oppositely to the teeth a rotatable holder, said blade having a planar body part and a convexly curved outer edge, a single row of elongated similar finger-like teeth formed in the body with the tips of the teeth terminating with lands which are parts of the curved outer edge of said body, said teeth being arranged in pairs, the teeth of each pair being adjacent each other and inclined in the same direction so that each tooth has a straight longitudinal axis which lies at an angle other than 90* to a tangent to the land of that tooth, the teeth of each pair also being inclined oppositely to the teeth of the adjacent pairs, the tips of said teeth being located along at least two transversely spaced arcs of substantially equal curvature there being at least one tooth tip arc to each side of said blade, the teeth having their tips common to an arc each being oppositely inclined to the adjacent teeth having tips common to the same arc.

Claim 5

A blade as claimed in claim 2 wherein the longitudinal axes of the teeth of each pair are substantially parallel.

Claim 6

A blade as claimed in claim 2 wherein the longitudinal axes of the teeth of each pair converge as the teeth extend outwardly to the outer edge of the body.

Claim 7

A blade as claimed in claim 2 wherein the longitudinal axis of each tooth is at an angle of the order of 45* to a line at the tooth tip which is at a tangent to the arc including the tooth tip and the distance between the first-third and second-fourth teEth of each group of two converging pairs is of the order of 0.2'''' to 0.3''''.

Claim 8

A blade as claimed in claim 2 wherein the longitudinal axes of the teeth of each pair are respectively at an angle of the order of 45* and 55* to 60* to lines at the teeth tips which lie at a tangent to the respective arcs including the teeth tips, said 55*-60* inclined teeth being adjacent each other in each group of two converging pairs and the distance between first-third and second-fourth teeth of each such group is of the order of 0.2 inch to 0.3 inch.

Claim 9

A blade as claimed in claim 2 wherein alternate teeth are oppositely set.

Claim 10

A blade as claimed in claim 2 wherein consecutive diverging pairs of teeth constitute groups and the second and third teeth of each group are oppositely set to the first and fourth teeth of that group.

Claim 11

A blade as claimed in claim 2 wherein some of the teeth are unset.