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US Patent: 1,687,788
Screw Driver
Screw Gripping Screwdriver
Patentee:
Abraham S. Pinkus - New York, NY

USPTO Classifications:
81/453

Tool Categories:
screwdrivers : screwdriver blades

Assignees:
None

Manufacturer:
Unknown

Witnesses:
none listed

Patent Dates:
Applied: Nov. 03, 1925
Granted: Oct. 16, 1928

Patent Pictures: [ 1 | 2 | 3 ]
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Description:
This a screw gripping screw driver, with the ability to be used one handed to install or remove screws and automatically releases the screw when it is completely installed . Sample marked on the disc,""SCROO-GRIP"trade mark,Pat.Pend.Automatic release screw-driver".

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