US Patent: 69,292 - Improvement in Calipers and Dividers


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US Patent: 69,292

Improvement in Calipers and Dividers

Patentee:

Edward Wright (exact or similar names) - Worcester, MA

USPTO Classifications:

33/558.05

Tool Categories:

layout tools : calipers

Assignees:

None

Manufacturer:

Wright Machine Co. - Worcester, MA

Witnesses:

Thos. H. Dodge

D. L. Miller

Patent Dates:
Granted:	Sep. 24, 1867

Patent Pictures: [ 1 | 2 ]

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Description:

Separate spring from the arms which allows lower cost construction and replacement if the spring happens to break. Known example only marked with patent date. An improved version of this tool was patented in 1887 (#355,430), which added a quick-release nut to the threaded rod.

The inventor has over 40 patents to his credit, mostly dealing with cotton manufacturing, but he also hold the patent to a well-known patented butt gage, #505,868.