Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1988-11-15
1989-07-25
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 1A, 279 1M, 408239A, 408241R, B23B 5102, B23B 3106
Patent
active
048507580
ABSTRACT:
This is an improved method for quickly changing and holding drill bits in electric drills. It includes hexagonal-ended drill bits and a holder with safety device for the bits. The holder is a steel sleeve with a male hexagonal end for insertion into 1/4" and larger drills. The opposite end is a female hex to receive the hex-ended drill bits. The holder is magnetized to hold the bits. The holder also supports a spring loaded two-piece safety split sleeve device surrounding the holder. The drill bit end of the split sleeve is folded over a fit into a circular groove in the drill bit and is held firmly in the groove by spring tension. This device keeps the bit in the holder when removing the bit from the material being worked. The split sleeves pivot at their attachment point to the holder, thus permitting rapid changing of drill bits (and other hex accessories) by simply squeezing the chuck end of the split sleeves causing them to pivot, thus opening the opposite end so that bits can be inserted and removed. The hex size of the drill bits and holder in this invention, for reasons of safety, is larger than the hex accessories currently on the market.
REFERENCES:
patent: 2667194 (1954-01-01), Fischer et al.
patent: 3007504 (1961-11-01), Clark
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