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US Patent: 127,902
Improvement in Dynamometer-Wrenches
Improvement in Balance or Indicator Wrench
Harvey Reid Leonard - Portland, OR

USPTO Classifications:
81/180.1, 81/480, 81/60

Tool Categories:
wrenches : torque wrenches
wrenches : ratchet wrenches


Not known to have been produced

W. W. Piper
Eugene Semple
O. F. Bell
Fredk. Artos
Emma Greenaway

Patent Dates:
Granted: Jun. 11, 1872

Patent Pictures: [ 1 | 2 ]
H. R. Leonard Pat. June 11, 1872
USPTO pdf tiff
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The patent is for a tension-adjustable ratchet pawl which would slip when the strain reached a pre-determined limit. The patent shows the principle applied to both open-end and box-end wrenches. It would accomodate a range of sizes by the use of adjusting sleeves. The specifications describe this in use tensioning rods in bridge trusses, straining rigging on sailing vessels, or as a dynamometer.

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