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US Patent: 414,615
Tension Registering Wrench
John Walker - Cleveland, OH

USPTO Classifications:
73/862.21, 81/180.1, 81/478

Tool Categories:
wrenches : torque wrenches


Not known to have been produced

Dan'l Fisher
Rellanson Smith
Frank L. Hull
Harry A. Westerfield

Patent Dates:
Applied: Feb. 02, 1889
Granted: Nov. 05, 1889

Patent Pictures:
John Walker patent November 5, 1889
USPTO pdf tiff
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A hinge bolt in the shank and compression spring provide a tension-indicating mechanism; the frame includes scale markings to indicate the amount of deflection. The swinging handle is to encourage equal force being applied each time the wrench is used.

This design was conceived for large scale machinery or bridge construction work where equal tension on bolts and truss rods is an important consideration.

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