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US Patent: 510,494
Key Seat Rule
David Wilson - Dayton, OH

USPTO Classifications:

Tool Categories:
rules : rule attachments
layout tools : special purpose gauges


Not known to have been produced

L. C. Leoty
Robert Douthitt
George H. Wood
Richard J. McCarty

Patent Dates:
Applied: Mar. 03, 1893
Granted: Dec. 12, 1893

Patent Pictures:
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My invention relates to new and useful improvements in key-seat rules for drawing parallel lines on shafts for key-seats, mortises, &c. The object of my invention is to provide a key-seat rule consisting of a single scale or blade secured in clamps, the said clamps having a capacity to fit rules of various lengths and widths. The improved feature of my device consists in providing clamps for holding a single straight edge rule and adapting it, in connection with said clamps, to serve the purposes for which two straight edges are used. My improvement is also capable of other uses, and it may properly be termed a combined gage, caliper and key-seat rule. In using the device as a caliper the clamps may be adjusted to measure the diameter of flat or square stock on either side of the rule. For the purposes of a depth gage for determining the distances from top to bottom surfaces, or from edge to edge.

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