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US Patent: 25,460
Carpenter's Rule Folding Rule Joint
Patentees: David M. Smith (exact or similar names) - Springfield, VT Hamlin Whitmore (exact or similar names) - Springfield, VT USPTO Classifications: 403/146 Tool Categories: rules : folding rules : folding rule joints Assignees: None Manufacturer: Not known to have been produced Witnesses: Henry Barnard B. F. Dana	Patent Dates: Granted: Sep. 13, 1859 Patent Pictures: USPTO (New site tip) Google Patents Report data errors or omissions to steward Ralph Brendler
Description: This is a fairly simple joint for a folding rule, which uses small springs to keep a good friction fit after wear.

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