Patent Model - Improvement in Locks for Prison-Doors

Maker and role
Sylvanus Denio, Patentee
Production date
Feb 22 1876
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Object detail

Iron, brass
8 3/4 x 11 1/8 x 10 1/2" (22.2 x 28.3 x 26.7cm)
Denio's invention "consists in the combination, with the cam-shaft of the main bolt, of a drop bolt or latch, which falls by its own weight into a position to prevent the rotation of the cam-shaft after the main bolt has been thrown out, the drop bolt being raised to release the cam-shaft by a suitable key, by which construction the spring heretofore used is dispensed with, and the lock rendered at all times reliable." (Patent Number 173,775)
Object number
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