US Patent: 370,255 - Screw Driver


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US Patent: 370,255

Screw Driver

Patentee:

Daniel R. Hart (exact or similar names) - New York, NY

USPTO Classifications:

411/402, 411/919, 81/436, D8/82

Tool Categories:

screwdrivers : screwdriver blades

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

Patent Dates:
Applied:	Jun. 23, 1887
Granted:	Sep. 20, 1887

Patent Pictures:

Daniel R. Hart patent September 20, 1887

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Description:

The patent is for a rounded tip on screwdriver blades, shaped to conform to the rounded bottom of the "nick" in wood screws. The drawings show the shape applied to a screwdriver, or to a screwdriver bit for a brace.