Ordnance – Automatic – Movable barrel
Patent
1974-05-17
1976-02-17
Feinberg, Samuel
Ordnance
Automatic
Movable barrel
89 1K, F41D 502, F41D 1100
Patent
active
039384225
ABSTRACT:
An automatic firearm having a bolt which recoils upon each shot and an additional mass mounted for sliding parallel to the bolt and fastened to the bolt by an amplifying lever which is pivotally mounted on the bolt by a transverse pin and which has a resting surface adapted to come into contact with a stop surface which is stationary at the start of the recoil of the bolt. The amplifying lever is H-shaped. The cross bar of the H constitutes the transverse axis of pivoting of the assembly of the lever and the two vertical uprights constitute two symmetrical unit amplifying levers operating in parallel each capable of assuring a proper fastening together of the bolt and the additional mass. The assembly of the amplifying lever has complete symmetry with respect to the central plane perpendicular to its axis of pivot and lends itself to continuation of the firing in case of the breaking of one of the unit amplifying levers. The amplifying lever has a resting surface directed toward the rear adapted, upon the start of the recoil of the bolt, to come into contact with a stop surface rigidly fastened to a fixed portion of the firearm so as to impart to the amplifying lever a tilting movement which has the effect of accelerating the additional mass towards the rear. The arrangement imparts to the resting surface and the stop surface the shape of cylindrical sections of the same radius of curvature, so that the resting surface and stop surface cooperate by area contact when the recoil movement of the bolt commences.
REFERENCES:
patent: 830511 (1906-09-01), Lehmann
patent: 1985493 (1934-12-01), Gebauer et al.
patent: 2459141 (1949-01-01), Balleisen
patent: 2503575 (1950-04-01), Anderson et al.
Feinberg Samuel
Jordan C. T.
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