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US Patent: 440,174
Extension Hack Saw Frame
Patentee:
Warren C. Marston - Millers Falls, MA

USPTO Classifications:
30/510

Tool Categories:
metalworking tools : hacksaws

Assignees:
Warren C. Marston - Millers Falls, MA
Robert H. Austin - New Haven, CT

Manufacturer:
Not known to have been produced

Witnesses:
Fred C. Earle
J. H. Shumway
Robert H. Austin
Freeman C. Ginared

Patent Dates:
Applied: Sep. 30, 1889
Granted: Nov. 11, 1890

Patent Pictures:
Warren C. Marston patent November 11, 1890
USPTO pdf tiff
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Description:
The frame length is adjustable by a stud on a spring that fits in a series of holes. The blades are attached by split rings that run through a holes in the blades and in the attachment studs. The blade is tightened by a wing nut on one attachment stud.

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