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Description: |
| An illustrated advertisement in the March 1887 Carpentry and Building features "F. E. Allen's Patent Floor Clamp, for Carpenters' and Builders' use, Manufactured exclusively by Witherby, Rugg & Richardson, 26 Salisbury St., Worcester, Mass, U. S. A." The patent date is given under the illustration, which shows some refinements to the design in the patent. For example, the lever D in the Witherby, Rugg & Richardson version has a elongated central slot through which bar G passes, and this change would prevent the mechanism from twisting sideways as the lever is forced down. |
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