US Patent: 280,026 - Shell Type Bit with Recessed Lip


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US Patent: 280,026

Spoon Boring-Bit
Shell Type Bit with Recessed Lip

Patentee:

Benjamin Forstner (exact or similar names) - Salem, OR

USPTO Classifications:

408/199

Tool Categories:

metalworking machines : drilling and boring : drill bits

woodworking tools : hand drills : drill bits

Assignees:

Addison C. Gibbs - Portland, OR

Benjamin Forstner - Salem, OR

Manufacturer:

Forstner, Sharp & Co. - Salem, OR

Witnesses:

Seth R. Hammer

David Early

Patent Dates:
Applied:	Mar. 06, 1883
Granted:	Jun. 26, 1883

Patent Pictures:

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Description:

The function of this bit appears to be very similar to that of Forstner's "signature" patented bit (155,148), in that the sharpened circular rim leads the cut, while the chip is undercut and lifted by a slightly recessed cutting lip.