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US Patent: 633,657
Clamping Appliance For Frames With Glued Mitered Joints
Barthel Müller - Coblenz, Germany

USPTO Classifications:
24/270, 269/108, 269/270

Tool Categories:
work holding : clamps : miter and corner clamps


Not known to have been produced

Julius Lutz
Isaac B. Owens
Gertud Stenz
William H. Madden

Patent Dates:
Applied: May 19, 1898
Granted: Sep. 26, 1899

Patent Pictures:
Barthel Müller patent Sept. 26, 1899
USPTO pdf tiff
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The corner blocks have pulleys; one includes a cam lever tightener and latch for the encircling cord. By varying the internal angle of the corner blocks, the principle applies to clamps for frames with three or more sides.

The specifications note corresponding Austrian and British patent applications.

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