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US Patent: 112,143
Improvement in Screw Drivers
Patentee:
Henry L. Hildreth - Lockport, NY

USPTO Classifications:
81/33

Tool Categories:
screwdrivers : screwdriver mechanisms : ratcheting screwdrivers

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
Frederick Eberts
M. Stewart

Patent Dates:
Granted: Feb. 28, 1871

Patent Pictures:
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Description:
Ratchet mechanism is provided by an external pawl that engages the collar securing the blade.

Hildreth's patent was later referenced in several later ratching screwdriver designs.

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