Geometrical instruments – Straight-line light ray type – Aerial bomb sight
Patent
1976-03-24
1977-11-15
Phillips, Charles E.
Geometrical instruments
Straight-line light ray type
Aerial bomb sight
279 2R, F41G 154
Patent
active
040579050
ABSTRACT:
The following disclosure relates to a device for the securement of a sighting instrument within the bore of a shotgun in which the present device comprises: a main shaft; means for a spring-biased reciprocal movement which is axially secured about said shaft; a muzzle stopper having a partially cone-like contour including a circumferentially formed finger-grip therein, the stopper being axially secured about said spring-biased means such as to create a potential for hypodermic-like reciprocating movement of the stopper with respect to the main shaft; an end cone disposed at the end of the shaft opposite to that end proximate to the finger grip of the muzzle stopper; and three resilient ball-bearing rods, each having bearings at the same one end thereof, each of said rods situated about said shaft at 120.degree. angular displacements from each other, each of said rods being secured at its non-bearing end to that portion of said stopper opposite to the finger-grip, and each of the ball-bearings normally pressing against the periphery of the end cone wherein the longitudinal position of the ball-bearings with respect to the main shaft is determined through the hypodermic-like reciprocating movement of the muzzle stopper, thereby insuring a precise fit of said stopper within the gun bore and, further, by virtue of the uniform polycentric disposition of the ball-bearings between the end cones and the inner surface of the bore, assuring an absolute concentricity of the main shaft with respect to the bore.
REFERENCES:
patent: 1621947 (1927-03-01), Moore
patent: 2179594 (1939-11-01), Johnson
patent: 2773309 (1956-12-01), Elliott
patent: 3744133 (1973-07-01), Fukushima et al.
patent: 3908282 (1975-09-01), Steffan
Jackson David A.
Phillips Charles E.
Silverman Mel K.
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