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The Fishing Reel Patent Archive

The mechanical heart of American angling

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Steel center pins

Cross-sectional line drawing of a fishing reel showing the spool D mounted between two head plates C and B, with gear teeth F, a crank handle G with wooden knob, and labeled parts including center pins E and E2, spindle H, and set-screw a, mounted on a vertical pillar frame A.

IMPROVEMENT IN FISHING-LINE REELS.A. B. Hartill · August 7, 1866

United States patent drawings and specifications are works of the U.S. government and are in the public domain — they were never copyrighted. Download them, print them, frame them. Our commentary and descriptions are © 2026 The Fishing Reel Patent Archive.

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