Report of the Commissioner of Patents for the Year 1855, Vol. 2: Arts and Manufactures (Classic Reprint) - Tapa blanda

Excerpt from Report of the Commissioner of Patents for the Year 1855, Vol. 2: Arts and Manufactures

The figure represents the bit R as being fastened in the stock 8. To loosen the bit, the nut a is turned (thereby screwing down the screw shank of the spring) until the projection B of the spring springs back into the recess c in the stock, when the bit can be drawn out. The pin g, entering a groove in the outside of nut a, serves to confine said nut to the end of the stock.

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