Cutting by use of rotating axially moving tool – Tool or tool with support – Hollow milling tool
Patent
1981-12-14
1984-02-21
Briggs, William R.
Cutting by use of rotating axially moving tool
Tool or tool with support
Hollow milling tool
408 82, 408204, B23B 5104
Patent
active
044326777
ABSTRACT:
A rotary tool, adapted to be chucked in a rotary power tool, is provided with cutting blades for cutting away the annulus that surrounds the core portion of a lock of the type referred to above. When the annulus is cut away, the tumbler mechanism is exposed axially outwardly so that the tumblers may be actuated by a depressor tool for opening the lock in the event the key has been lost. The cutter has an axial tubular front end portion that pilots on the lock core and fits the annular gap between the core and surrounding portion of the lock. The front end of the cutter has a stop portion projecting axially ahead of the front cutting edges to limit the depth of the cut and to prevent damage to the projecting ends of the tumbler pins.
REFERENCES:
patent: 1716455 (1929-06-01), Miller
patent: 1892863 (1933-01-01), Blanc
patent: 1941551 (1934-01-01), Gjertsen
patent: 2797598 (1957-07-01), Labenz
patent: 3130763 (1964-04-01), Schlosser et al.
patent: 3244035 (1966-04-01), Jehle et al.
patent: 4156375 (1979-05-01), Crasnianski
patent: 4167363 (1979-09-01), Whitesel
patent: 4261093 (1981-04-01), Steffen et al.
Briggs William R.
Meier Lawrence
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