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US Patent: 145,506
Screw Driver
Improvement in Screwdrivers
Patentee:
Sylvanus R. Kneeland (exact or similar names) - Charlsetown, MA

USPTO Classifications:
81/451

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
E. P. Boardman
Charles  Letts

Patent Dates:
Applied: Nov. 11, 1873
Granted: Dec. 16, 1873

Patent Pictures:
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Description:
This Patent is for a spring loaded sleeve on a screwdriver, which prevents the screwdriver from slipping off the screw and damaging the surface of the item the screw is being driven into,IE: a piano,or cabinet. Patent 147654 is an improvement of this patent.

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