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US Patent: 2,391,143
Wrench
Patentee:
August C. Ertner - Seattle, WA

USPTO Classifications:
269/170, 81/152, D8/22

Tool Categories:
wrenches : wrench adjustment types : quick adjust wrenches

Assignees:
Federal Trading Company - Seattle, WA

Manufacturer:
Unknown

Witnesses:
none listed

Patent Dates:
Applied: Oct. 02, 1943
Granted: Dec. 18, 1945

Patent Pictures:
August C. Ertner patent Dec. 18, 1945
USPTO pdf tiff
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Description:
Quick adjust nut wrench with spring-tensioned latch of two or more plates to hold adjustment.

Marketed as the ERTNER SPEED WRENCH.

Corresponding Canadian patent CA-448,026 was granted April 20, 1948.

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