Abrasive tools
OwnerBernard A. Jenningsinventor
Life of this patent
Estimating the term…
Abstract
An abrasive tool such as a drill bit has a body with a working face (10). Undercut recesses (12) are formed in the working face (10). Cutting inserts (16) which present working ends (20) are located in the recesses (12). Locking means (24) in the recesses engage between the undercuts (14) and formations (22) on the inserts (16). This locks the inserts (16) against withdrawal from the recesses (12).
Claims10
An abrasive tool comprising a body having a working face, at least one recess which is formed in the body and which extends from a predetermined depth to the working face, the recess having at least one side and, at a localized position along the length of the recess within said body, includes an undercut which extends outwardly beyond the side, a cutting insert which presents a working end extending beyond said working face and which is located in the recess, the cutting insert having a laterally outwardly extending projection located along its length within said recess at a localized position aligned with the undercut in the recess, said recess being dimensioned so as to define a space between said side of the cutting insert extending towards said working face of the body, and a deformable locking insert being forced into the space between the recess and said cutting insert so as to cause at least a portion of said locking insert to expand and engage between the mutually aligned projection of the cutting insert and the undercut of the recess to thereby lock the insert against withdrawal from the recess.
A method of securing a cutting insert to the working face of an abrasive tool which has a recess for receiving the cutting insert, said recess being dimensioned so as to provide a space between said recess and said cutting tool to a predetermined depth of said recess, the method comprising the steps of:
- (a) inserting the cutting insert into the recess in such a manner that a lateral projection formed on said cutting insert at a localized position along the length of the cutting insert, is aligned with a laterally outward extending undercut formed at a localized position in the depth of the recess, and
- (b) forcibly deforming a locking insert into the space provided between the recess and the cutting insert so that at least a portion of the locking insert is deformed so as to expand into the space between the lateral projection of the cutting insert and the undercut of the recess and to thereby lock the cutting insert against withdrawal from the recess.
Dependencies are inferred from the claim text.