Firearms – With adjustable head space – By reaming
Patent
1981-01-12
1983-06-21
Jordan, Charles T.
Firearms
With adjustable head space
By reaming
33233, F41G 110
Patent
active
043887724
ABSTRACT:
An adjustable sight for firearms of the type having a trapezoidally shaped dovetail extending transversely across the upper rear end of the firearm and a sighting bead projecting upwardly at the front of the slide. The adjustable sight includes a trapezoidally shaped base which replaces trapezoidally shaped, fixed sights normally mounted in the dovetail. The base is frictionally secured to the slide by a set screw extending through a threaded bore in the base which is torqued against the lower wall of the dovetail. A transverse slot formed in the base receives a sight blade having formed therein a notch projecting downwardly from its upper edge. The blade is held in place by a blade set screw mounted in a second threaded bore in the base. The set screw intersects the slot at an acute angle, and its end is sufficiently pointed so that its lower surface contacts the lower edge of an aperture formed in the blade. The aperture is positioned at the side of the notch, which causes the notch to rotate downwardly as the set screw imparts a rotational moment to the blade about the aperture, thereby forcing the lower edge of the blade against the bottom of the slot. The aperture is elliptically shaped, with its major axis positioned vertically so that clearance is provided between the end of the set screw and the upper edges of the aperture and to ensure that the blade is centered in the slot. The elevation of the firearm is adjusted by sequentially mounting blades in the slot having varying heights until the vertical accuracy of the firearm is maximized. The windage of the firearm is adjusted by loosening the base set screw and shifting the base to either side until the windage accuracy is maximized.
REFERENCES:
patent: 496051 (1893-04-01), Freund
patent: 1523319 (1925-01-01), Vosmek
patent: 2473891 (1949-06-01), Lillard
patent: 3641676 (1972-02-01), Knutsen et al.
patent: 3646682 (1972-03-01), Edwin
Detonics Pistol Accessories Ltd.
Jordan Charles T.
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