Method of applying abrasives to bullets for use in pressure (fire) lapping of gun barrels
Patent 5378499 Issued on January 3, 1995. Estimated Expiration Date: 
December 11, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 11, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 1231227 1495008 2765740 2999767 3476047 3740883 3876450 Wear resistant coated pipe and method of making it Method of coating bullets to reduce the leading effect thereof on the bores of firearms Method for cleaning firearms InventorsAssigneeApplicationNo. 989234 filed on 12/11/1992US Classes:427/242, RUMBLING OR TUMBLING427/203, Coating over the applied coating of particles427/204, Silicon compound containing particles (e.g., sand, etc.)427/205, Metal or metallic compound containing particles427/416, Wax containing coating427/419.7, Boride, carbide, nitride, phosphide, silicide, or sulfide-containing coating427/419.8Organometallic or metal salt of organic compound-containing coatingExaminersPrimary: Beck, ShriveAssistant: Dudash, Diana Attorney, Agent or FirmForeign Patent References
International ClassB05D 003/12AbstractA method for lapping of gun barrels on fully assembied firearms is provided using cartridges fitted with lapping bullets impregnated with abrasive. The present invention provides a process for simultaneously impregnating a quantity of lapping bullets with an abrasive, in which a quantity of unlubricated bullets are placed in a tumbler with steel balls and quantity of the desired abrasive. The speed of rotation of the tumbler, and the shape of the tumbler are selected so that the bullet/abrasive/tumbling media mix folds on itself, thus providing an even impregnation of abrasive on the bullets and minimizing any deformation of the bullets. The mixture is allowed to tumble for a period of time, typically about an hour, after which a sufficient quantity of the abrasive is firmly embedded on the surface of each bullet. The abrasive impregnated bullets can then be coated with a protective and lubricating finish, such as carnauba wax, if desired. The abrasive-impregnated bullets can then be sized and lubricated and loaded into a cartridge containing gun powder and a wad positioned against the base of each bullet. Using this procedure, it is possible to manufacture in quantity a series of lapping cartridges having coarse, medium, fine and polishing grits impregnated on the bullets. Pressure (Fire) Lapping can then be carried out in stages using the loaded cartridges by firing through the barrel a series of lapping bullets impregnated with coarse abrasive, followed in order by the lapping bullets with the medium, fine and polishiing grits. The barrel is cleaned and checked after every ten rounds or so, or when changing from one type grit to another. This process removes dimensional variations and roughness in the bore, and produces a gun barrel which is more accurate, and less susceptible to copper, carbon and lead fouling.Other References
Field of SearchRUMBLING OR TUMBLINGFRICTIONAL APPLICATION (I.E., RUBBING SOLID COATING MATERIAL ON BASE) Coating over the applied coating of particles Silicon compound containing particles (e.g., sand, etc.) Metal base Applying superposed diverse coatings or coating a coated base Metal base Wax containing coating Boride, carbide, nitride, phosphide, silicide, or sulfide-containing coating Organometallic or metal salt of organic compound-containing coating For barrel cleaning | |
