US Patent: 414,615
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| Tension Registering Wrench
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| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Feb. 02, 1889 |
| Granted: |
Nov. 05, 1889 |
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Patent Pictures:
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John Walker patent November 5, 1889 |
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Description: |
| 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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