US 4,750,396 A · Cutter tooth and tool employing it

Abstract

The present invention is a rotary tool cutter tooth having a readily replaceable cutting portion and a tool employing the tooth. The tooth consists of an elongated shank for mounting the tooth on the tool body with a cutter element being bolted to the forward end of the shank. Preferably the back face of the cutter element is vertically grooved to receive the forward end of the shank so that the two are precisely aligned and any forces which tend to rotate the cutter element during use are resisted. The face of the shank that adjoins the cutter element may further be provided with a negative or inverted step which engages a corresponding step across the groove of the cutter element. These steps interlock to resist forces which would tend to translate the cutter element radially outward when in use. The cutter element may be made of a tool steel or other hard alloy, whereas the shank is typically formed from a mild steel.

Claims20

Dependent claims

A rotary cutter tooth having a readily replaceable cutting portion which comprises:

a head means having at least one cutting edge, an elongated shank means for mounting the cutter tooth on a tool body, and a fastening means for rigidly uniting the head means to the leading end of the shank means;
and
translation prevention means for resisting forces tending to translate the head means radially outward when in use, said translation prevention means comprising an inverted transverse step formed in the leading end of the shank means and a corresponding transverse step formed in the adjoining portion of the cutter element, said steps being in an engaging and interlocking relationship,
wherein at least a major portion of the shank means is separate from the head means and the fastening means is a bolt oriented through the head and shank generally parallel to the longitudinal axis of the shank means.

1 more element

In a saw having a flat metallic sawplate of generally circular configuration, replaceable cutter teeth located around the periphery of the sawplate, and opposed flat tooth retaining segment members attached around and extending beyond the periphery of each face of the sawplate, the improvement which comprises:

cutter teeth having a readily replaceable head means with at least one cutting edge, an elongated shank means for mounting the cutter tooth on the sawplate, and a fastening means for rigidly uniting the head means to the leading end of the shank means;
and
translation prevention means for resisting forces tending to translate the head means radially outward when in use, said translation prevention means comprising an inverted transverse step formed in the leading end of the shank means and a corresponding transverse step formed in the adjoining portion of the cutter element, said steps being in an engaging and interlocking relationship,
wherein at least a major portion of the shank means is separate from the head means and the fastening means is a bolt oriented through the head and shank generally parallel to the longitudinal axis of the shank means.

1 more element

Dependencies are inferred from the claim text.

Cutter tooth and tool employing it

Life of this patent

Cutter tooth and tool employing it

Life of this patent

Abstract

Claims20