Firearms – Indicators – Magazine shot
Patent
1994-07-29
1995-04-18
Brown, David
Firearms
Indicators
Magazine shot
42 84, F41A 962
Patent
active
054067308
ABSTRACT:
A method and apparatus for counting the rounds expended from a firearm. When a non sound-suppressed firearm is discharged, two things occur: A strong sound wave is produced due to the quick expansion of the gases produced by the ignition of the powder in the case; and a rearward motion of the firearm occurs, usually referred to as recoil, due to the projectile moving in the forward direction, as Newton's law states. The integration of both recoil and sound transducers guarantees that in order for the device to increment or decrement both the recoil and the gunshot must occur in the same time frame, thus guaranteeing an accurate count with an easy to install and compact device comprised of an acoustic and dynamic switch, whose outputs are fed into the input of a NAND gate, with the output of the NAND gate fed into a digital counter, then fed into a decoder/driver for output into the output display. The device is able to be reset just before or just after reloading of the firearm by the push of a button.
REFERENCES:
patent: 2306747 (1942-12-01), Ojalvo
patent: 4001961 (1977-01-01), Johnson et al.
patent: 5005307 (1991-04-01), Horne
patent: 5052138 (1991-10-01), Crain
patent: 5142805 (1992-09-01), Horne et al.
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