US 4,057,905 AGranted

Device for the securement of a sighting instrument within the bore of a shotgun

OwnerJoseph Piajainventor

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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.

Claims2

Dependent claims

In combination, a sighting instrument and a device for the securement of said sighting instrument in the bore of a shotgun, said combination including:

a. a muzzle stopper having a truncated, cone-like contour including a circumferentially formed fingergrip therein, said stopper provided with an axially extending cylindrical bore, said bore comprising a first main bore, and a second larger diameter counterbore,
b. a main shaft extending through said cylindrical bore and adapted for spring-biased reciprocal movement therewithin,
c. a spring annularly surrounding said main shaft and in contact with said counterbore for facilitating said spring-biased reciprocal movement;
d. an end core disposed at the end of said shaft located furthest away from said finger-grip of said muzzle stopper;
and
e. three resilient ball-bearing rods each having a ball-bearing at the same one end thereof, each of said rods situated about said shaft at a 120.degree. angular displacement from each other, each of rods being secured at its non-bearing end to that portion of said stopper opposite to said finger-grip, each of said ball-bearings normally pressing against the periphery of said end cone, wherein the longitudinal position of said ball-bearings with respect to said shaft is self-established through said reciprocating movement of said muzzle stopper, thereby attaining a precise fit of said muzzle stopper within the gun bore and an absolute concentricity of said main shaft with respect to the bore, wherein said sighting device is mounted on the end of said main shaft opposite said end cone.

3 more elements

Dependencies are inferred from the claim text.