Abstract A composite bit or drill having a material working section adhesively connected to an enlarged gripping section. The material working section includes generally a cutting, grinding or finishing portion and continuous therewith a shank portion and is made of hard, abrasion resistant, heat resistant, durable alloys. The gripping section has a relatively large mass and large outer diameter with respect to the material working section and has an accurately formed longitudinal bore therein for receiving the shank of the material working section the adhesive connection between the material working section and the gripping section will not prevent heat transfer between these elements. Adhesive materials for connecting the cutting section to the gripping section may be anaerobic adhesives, epoxy adhesives, cyanoacrylate adhesives and other compounds depending on the bond strength required and the heat transfer characteristics established between the material working section, the gripping section of the bit and the chucking means for holding the composite bit or drill. Additionally, for forming a composite bit or drill there is provided a gripping element or jacket having a longitudinal bore formed to receive drills or the like type tools within a predetermined range of sizes to permit the bit or drill to be fitted and adhesively connected in the bored jacket elements in any type of work shop where such tools are used.
In a composite bit as claimed in claim 1 wherein the longitudinal bore extends at least into one end of the gripping section and has a predetermined minimum length as a function of the diameter of the shank of the material working means and the available bond strength of the adhesive.
Claim 2
Dependent Claim
64 words
In a composite tool as claimed in claim 1 wherein the material working means is a conventional straight shank twist drill, and the shank of said twist drill having a sufficient length thereof in engagement with the wall of the longitudinal bore to provide for the required adhesive bonding to connect the shank of the straight shank twist drill in the gripping section means.
Claim 3
Dependent Claim
72 words
In a composite tool as claimed in claim 1 wherein the material working means is a pivot type twist drill including, an enlarged diameter shank, and the longitudinal bore in said gripping section means having sufficient length to provide for the required adhesive bonding of the pivot type twist drill to the gripping section means when the enlarged diameter shank thereof is mounted in the longitudinal bore of the gripping section means.
Claim 4
Dependent Claim
16 words
In a composite tool as claimed in claim 1 wherein the adhesive is an anaerobic adhesive.
Claim 5
Dependent Claim
16 words
In a composite tool as claimed in claim 1 wherein the adhesive is an epoxy adhesive.
Claim 6
Dependent Claim
16 words
In a composite tool as claimed in claim 1 wherein the adhesive is a cyanoacrylate adhesive.
Claim 7
Dependent Claim
24 words
In a composite tool as claimed in claim 3 wherein the gripping section means is made of drawn tubing to form the longitudinal bore.
Claim 8
Dependent Claim
28 words
In a composite tool as claimed in claim 1 wherein the gripping section is made of a material from the group copper alloys, aluminum alloys and silver alloys.
Claim 9
Dependent Claim
16 words
In a composite tool as claimed in claim 2 wherein the adhesive is an anaerobic adhesive.
Claim 10
Dependent Claim
28 words
In a composite tool as claimed in claim 10 wherein the gripping section is made of a material from the group copper alloys, aluminum alloys and silver alloys.