Rivet removing tool

Claim 2

A rivet-removing tool comprising: a. an elongated hollow casing having one end adapted to contact with a rivet head; b. a drill bit rOtatably mounted within said housing and having a drill bit head rotatable therewith; c. said drill bit head having an outer set of teeth for drilling a bore in the head of the rivet contacted by said casing when said drill bit is moved longitudinally in said casing for bringing said teeth into contact with the rivet head; and d. said drill bit head having a second set of inner teeth spaced in back of the first set of outer teeth for drilling a larger bore in the rivet head for providing space for receiving the material cut by the first set of teeth.

Claim 3

The combination as set forth in claim 1, and in which a. the end of said casing that is adapted to contact with a rivet head is provided with longitudinally extending prongs that are spaced from each other; b. the ends of the prongs having teeth for contacting with the rivet head and the spaces between the prongs permitting the passage of material cut from the rivet head by the two sets of teeth.

Claim 4

The combination as set forth in claim 1 and in which a. spring means is provided in said casing for yieldingly urging said drill bit to retract said drill bit head within said casing when said drill bit is not being used.

Claim 5

In a device of the type described; a. a cylindrical drill bit head having a cylindrical recess extending inwardly from its outer end; b. an outer set of arcuate cutting teeth at the outer end of said drill bit head, each tooth having a leading cutting edge that extends longitudinally of the head and an inclined arcuate edge that forms a cutting corner at its juncture with said leading cutting edge; c. a rear set of arcuate cutting teeth of the same number and spaced rearwardly of said outer set of teeth, each rear tooth being associated with an outer tooth and having a leading cutting edge that extends longitudinally of said head and lies flush with and projects radially beyond the leading cutting edge of the associate tooth; d. each rear tooth also having an inclined arcuate leading edge that forms a cutting corner at its juncture with the leading cutting edge of said outer tooth.

Claim 6

In a device of the type described; a. a cylindrical drill bit head having a cylindrical recess extending inwardly from its outer end; b. an outer set of arcuate cutting teeth at the outer end of said drill bit head, each tooth having a leading cutting edge that extends longitudinally of the head and an inclined arcuate edge that forms a cutting corner at its juncture with said leading cutting edge; c. a rear set of arcuate cutting teeth of the same number and spaced rearwardly of said outer set of teeth, each rear tooth being associated with an outer tooth and having a leading cutting edge that extends longitudinally of said head and lies flush with and projects radially beyond the leading cutting edge of the associate tooth; d. each rear tooth also having an inclined arcuate leading edge that forms a cutting corner at its juncture with the leading cutting edge of said outer tooth.

Claim 7

The combination as set forth in claim 4: and in which a. each rear cutting tooth having an outer arcuate surface that merges into the outer cylindrical surface of said head.

Claim 8

The combination as set forth in claim 4, and in which a. each outer tooth having its inner arcuate surface spiral shaped with its leading edge lying flush with the cylindrical surface of said recess and its trailing edge being spaced at a radially greater distance from the axis of said head than is the radius of said cylindrical recess.