# US 8,739,677 B1 · Boresight verification device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,739,677 B1 - Document ID: US8739677B1 - Status: Granted - Kind: B1 - Application number: 13/374,177 - Filed: 2011-12-05 - Granted: 2014-06-03 - Earliest claimed: 2011-12-05 - Assignees: The United States of America as represented by the Secretary of the Navy - Applicants: James Travis Robbins; Luis J. Rodriguez; Danny L. Wilson - Inventors: James Travis Robbins; Luis J. Rodriguez; Danny L. Wilson - Web page: https://patentgrep.com/patent/US8739677B1 ## CPC - F41A 31/02: for checking gun barrels - F41G 1/545: {Tools for adjustment of sights} - F41A: FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE - F41G: WEAPON SIGHTS; AIMING (optical aspects thereof G02B) ## Abstract A boresight verification device (BVD) comprised of a circular housing with a rear portion of smaller diameter and a front portion of larger diameter. The front portion securely holds a level. The circular housing also contains a plurality of spring plungers which grip the inside of a muzzle when BVD is inserted into a muzzle for use. A tooling ball provides a stable reference point. ## Claims ### Claim 1 A boresight verification device for aligning an internal bore of a barrel muzzle for a mortar to an external aim sight, said device comprising: a cylindrical housing including a front portion to extend beyond the muzzle and a rear portion for insertion into the bore, wherein said portions connect together in tandem along a symmetrical axis of said housing, said rear portion has a smaller diameter than the bore and also said front portion, and said front portion has a recess opposite said rear portion; at least one level secured transverse to said symmetrical axis within said recess in said front portion of said housing, said level presenting visual verification of orientation perpendicular to vertical direction of acceleration; a plurality of securing components symmetrically disposed around said rear portion, said securing components engaging the bore; and at least one indicator extending radially beyond the muzzle from said front portion to present a visual reference to the external sight in alignment with said rear portion. ### Claim 2 (depends on 1) The device of claim 1 which includes three securing components. ### Claim 3 (depends on 1) The device of claim 1 wherein said securing components are spring plungers. ### Claim 4 (depends on 1) The device of claim 1 wherein said diameter of said rear portion corresponds to the internal diameter of a mortar muzzle. ### Claim 5 (depends on 1) The device of claim 1 wherein said securing components are selected from the group consisting of spring plungers, expanding jaws or collars, spring-loaded feet, tapered shafts and combinations thereof. ### Claim 6 (depends on 1) The device of claim 1 wherein said securing components are spring plungers. ### Claim 7 (depends on 6) The device of claim 6 wherein said spring plungers include a friction-increasing coating. ### Claim 8 (depends on 6) The device of claim 6 wherein said device includes three spring plungers. ### Claim 9 (depends on 1) The device of claim 1 which further includes an additional securing component adapted to project into a mortar muzzle farther than said rear portion. ### Claim 10 (depends on 1) The device of claim 1 wherein said securing components are further configured to center said rear portion within the mortar muzzle. ### Claim 11 (depends on 1) The device of claim 1 in which said housing comprises a material selected from the group consisting of aluminum, steel, cast iron, plastic, polymers and combinations thereof. ### Claim 12 (depends on 1) The device of claim 1 wherein said indicator is a tooling ball. ### Claim 13 (depends on 1) The device of claim 1 wherein said indicator is selected from the group consisting of a tooling ball, a pointed dowel pin and a square edge. ### Claim 14 A boresight verification system for aligning a mortar to an external aim sight, said system comprising: a barrel muzzle for the mortar, said muzzle having an internal bore; a cylindrical housing including a front portion to extend beyond the muzzle and a rear portion for insertion into the bore, wherein said portions connect together in tandem along a symmetrical axis of said housing, said rear portion has a smaller diameter than said bore and also said front portion, and said front portion has a recess opposite said rear portion; at least one level secured transverse to said symmetrical axis within said recess in said front portion of said housing, said level presenting visual verification of orientation perpendicular to vertical direction of acceleration; a plurality of securing components symmetrically disposed around said rear portion, said securing components engaging the bore; and at least one indicator extending radially beyond the muzzle from said front portion to present a visual reference to the external sight in alignment with said rear portion. ### Claim 15 (depends on 14) The system of claim 14 wherein said indicator is a tooling ball. ### Claim 16 (depends on 14) The system of claim 14 wherein said indicator is press fit into position. ### Claim 17 (depends on 14) The system of claim 14 wherein said securing components are spring plungers. ### Claim 18 (depends on 14) The system of claim 14 which further includes a boresight verification magnifier.