Progressive ratchet rifling in a full gain twist

Firearms – Barrels – Rifling or lining

Patent

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Details

F41C 2100

Patent

active

043086810

ABSTRACT:
Rifling in a gunbarrel accelerates in spiral from a relatively bore-parallel beginning and has a groove surface which in cross-section progressively rotates concurrently with the acceleration in spiral starting from a circumferential shape bounding rectangular lands to an incline merging with the top of a land one side of each groove and deepening the leading edge of a land on the other side of each groove.

REFERENCES:
patent: 16377 (1857-01-01), Dimick
patent: 300515 (1884-06-01), Schneider
patent: 329303 (1885-10-01), Fosbery
patent: 338192 (1886-03-01), Rubin
patent: 835482 (1906-11-01), Vulpius
patent: 868938 (1907-10-01), Puff
patent: 1355421 (1920-10-01), Pedersen
patent: 1355422 (1920-10-01), Pedersen
patent: 1659625 (1928-02-01), Cowan
patent: 3616562 (1971-11-01), Burgsmuller
patent: 4126955 (1978-11-01), Coffield

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