US Patent: 2,897,696 - Sheet metal panel drill


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US Patent: 2,897,696

Sheet metal panel drill

Patentee:

Henry R. Tisserant (exact or similar names) - Jackson Heights, NY

USPTO Classifications:

408/225

Tool Categories:

metalworking machines : drilling and boring : drill bits

woodworking tools : hand drills : drill bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Unknown

Patent Dates:
Granted:	Aug. 04, 1959

Patent Pictures:

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Description:

This is a sheet metal drill bit that comes tantalizingly close to getting it right. Compared to the winning design of 1973 patent 3,758,222 this predecessor was more expensive to manufacture and was prone to feeding too aggressively and then grabbing.