US 5,396,708 A · Gun bore arbor

Abstract

A self-centering bore arbor device is disclosed which is self-aligning when inserted into the barrel of a shotgun and to which can be mounted a bore scope in a parallax relation with the central axis of the gun barrel. The self-centering property of this device is produced by a single source of pressure transmitted by a helical spring, inside a cylindrical bore collet tube, pressing against a circular 60 degree conical wedge inside the collet tube. This conical wedge distributes this pressure equally outward to the posterior free ends of three spring leaves displaced from each other about the posterior outer circumference of the collet tube by 120 degrees. Under this pressure the free ends of these spring leaves press outward against the inner wall of the gun barrel holding the collet tube in a proper concentric alignment with the gun barrel when the tapered muzzle plug forming the front end of the bore arbor is seated firmly against the inside of the gun barrel muzzle. The adaptable self-centering feature of the bore arbor provides the facility for use with the tapering barrel bore of a shotgun.

Claims6

Dependent claims

A self-centering bore arbor for partial insertion into the muzzle end of a shotgun barrel in a stable precision alignment with the central longitudinal axis of said barrel, said bore arbor comprising a main body which is an approximately cylindrical collet tube of diameter slightly less than said barrel diameter, the anterior end of said collet tube having means for mounting thereon a bore scope at the muzzle end of said barrel in a parallax relation with the central longitudinal axis of said barrel;

said collet tube further comprising means for firmly seating said bore arbor against said muzzle of said barrel when said bore arbor is inserted sufficiently far into said barrel;
portions of the lateral side of said collet tube forming a plurality of alternating parallel strips of rigid columns and posterior outward protruding spring leaf means, the posterior free ends of said spring leaf means providing contact means with the internal wall of said barrel and holding said bore arbor in a stable, self-centering contact relation against the interior cylindrical wall of said barrel when inserted into said barrel;
and said collet tube further containing self actuating means for equally distributing pressure radially outward against said spring leaf means to stabilize said bore arbor in said self-centering contact relation with said interior wall of said barrel.

Dependencies are inferred from the claim text.

Gun bore arbor

Life of this patent

Gun bore arbor

Life of this patent

Abstract

Claims6