US Patent: 813,922
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| Take Down Square
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Patentees:
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| Charles K. Sitton (exact or similar names) - Portland, OR |
| John H. Williams (exact or similar names) - Portland, OR |
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Patent Dates:
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| Applied: |
Mar. 20, 1905 |
| Granted: |
Feb. 27, 1906 |
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Russ Allen.
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Description: |
| Two screw headed cams (preferably elliptical) force the two pieces to lock together into a bevel shoulder.
Of note is handwritten on the specification page is: "Wahlfert 485402 Square, Folding", perhaps an note by the examiner.
Known example is marked with the patent date and an unreadable makers mark comprising what appears to be a shield and T/D in the center. |
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