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US Patent: 2,205,501
Safety Wrench
Patentee:
Joseph Sunnen - Ladue Village, St. Louis Count, MO

USPTO Classifications:
81/124.6, 81/478

Tool Categories:
wrenches : torque wrenches

Assignees:
None

Manufacturer:
Not known to have been produced

Witnesses:
none listed

Patent Dates:
Applied: Dec. 27, 1937
Granted: Jun. 25, 1940

Patent Pictures:
Joseph Sunnen patent June 25, 1940
USPTO pdf tiff
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Description:
After setting the desired tension level, the differential movement between the middle tube section and the end of the handle triggers "breakdown" when the tension level is reached. Two alternative forms are shown in the drawings and described in the specifications.

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