Patent Model - Improvement in Machine for Sharpening Horse-Shoe Calks

Maker and role
Ensign Bushnell, Patentee
Production date
Aug 11 1868
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Object detail

Iron, wood
12 x 11 1/2 x 3 3/4" (30.5 x 29.2 x 9.5cm)
"This invention relates to certain improvements in machines for sharpening horse-shoe calks, for which Letters Patent were granted to me, No. 55,617, and bearing date June 19, 1866. In this patent the screw for adjusting the spring to the calks passed directly through the spring and into the main stock; said spring being slotted for this purpose, which had a tendency to weaken it to considerable extent. A set-screw was also used, passing through the stock; and resting against the spring, to prevent the latter from coming in contact with the burr, thus complicating the parts and detracting them from the practicability of the invention. The cutting-edges of the burr were also straight or parallel with its axis, and required a greater application of power to sharpen the calk, than by the spiral cutters, which constitute my invention in this particular. My improvements are designed to obviate these difficulties..." (Patent Number 80,805)
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