Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1975-10-20
1977-04-12
Weidenfeld, Gil
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
408705, 403308, B23B 5100
Patent
active
040172023
ABSTRACT:
A boring tool with a variable length extension formed by a standard piece of pipe, for particular use in drilling downwardly from a wall studding header and through a fire brake bracing member which extends between the wall studs below the header, to facilitate the installation of piping, electric conduits, and the like, wherein a standard piece of pipe is threadedly connected by a coupling member at one end to a first shank portion of a boring tool, and a coupling member at its opposite end to an axially aligned second shank adapted for connection with a driving instrumentality. The coupling member in a modified form is provided at its pipe connection end with internally stepped threaded portions for selective connection with the ends of pipes of different diameter.
REFERENCES:
patent: 1018172 (1912-02-01), Downs
patent: 1225209 (1917-05-01), Beaulieu
patent: 2752965 (1956-07-01), Mackey
patent: 3865502 (1975-02-01), Hamann
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