Lubricating apparatus for a threaded rifle breech
View Patent ↗A nozzle for lubricating an internally threaded rifle breech. The nozzle has a body containing a bore, with an inlet end adapted to receive a supply of lubricant. The body has an opposed end portion having a cylindrical wall and an enclosed free end. The cylindrical wall has a number of lubricant exit apertures. The body may be L-shaped, and the inlet may be threaded for connection to a lubricant container. The cylindrical wall of the end portion may have an external diameter less than an adjacent portion diameter, so that a shoulder is formed to limit insertion depth. A cap may be provided to cover the exit apertures so that the body may remain attached to the lubricant container.
1. The combination of:
a rifle barrel extending from a breech end to a muzzle end and having
a bore extending from the muzzle end to an inward shoulder proximate the breech end, and
an internally threaded breech cavity disposed between the inward shoulder and the breech end, the internal threads having inward peaks defining an inner diameter of the breech cavity greater than the minimum diameter of said rifle barrel; and
a nozzle for lubricating only the internally threaded breech cavity of said rifle barrel, said nozzle including
an inlet portion with an inlet opening having a surface adapted to receive a fitting of a lubricant container, such that lubricant expelled from said container flows substantially only into the inlet opening,
an end portion having an outer cylindrical wall extending from the inlet portion to a closed end and perforated by a plurality of lubricant apertures, and
a lubricant passage extending from the inlet opening to the closed end and connecting with each of the lubricant apertures formed through the outer cylindrical wall of the end portion,
wherein the lubricant apertures are disposed along the outer cylindrical wall of the end portion such that, when the end portion of said nozzle is inserted into the internally threaded breech cavity of said rifle barrel, the lubricant apertures of said nozzle are registered only with the internal threads of the internally threaded breech cavity of said rifle barrel, the outer cylindrical wall having an outer diameter selected to closely fit within the inner diameter of the internally threaded breech cavity of said rifle barrel and having a length selected such that when the closed end contacts the inward shoulder of said rifle barrel, the lubricant aperture furthest from the closed end of said nozzle is adjacent to the internal threads of said rifle barrel.
2. The combination recited by claim 1 , wherein the inlet opening of said nozzle is internally threaded for connection to an outlet nozzle of a lubricant container.
3. The combination recited by claim 1 , wherein said nozzle is angled to define an L-shape between the end portion of said nozzle and the inlet opening.
4. The combination recited by claim 1 , wherein the outer diameter of the end portion of said nozzle is less than an external diameter of said nozzle adjacent to the end portion, such that a shoulder is formed on the outer surface of said nozzle.
5. The combination recited by claim 1 , wherein the lubricant apertures are disposed with respect to the closed end of said nozzle such that the lubricant apertures are disposed substantially in registration with the internal thread grooves of said rifle barrel when the closed end of said nozzle abuts against the inward shoulder formed in said rifle barrel adjacent to the internally threaded breech cavity.
6. The combination recited by claim 5 , wherein the breech of said rifle barrel includes a rearward portion disposed between the internally threaded breech cavity and the breech end of said rifle barrel, and the lubricant apertures of said nozzle are disposed with respect to the shoulder of said nozzle such that the lubricant apertures are disposed substantially in registration with the internal thread grooves of said rifle barrel when the shoulder of said nozzle abuts against a radial surface defined between the rearward portion and the internally threaded breech cavity of said rifle barrel.
7. The combination recited by claim 1 , wherein the lubricant apertures are evenly distributed about the circumference of the outer cylindrical wall of said nozzle.
8. The combination recited by claim 1 , wherein the lubricant apertures are arranged in rows parallel to the lubricant passage.
9. The combination recited by claim 1 , further comprising:
a cap defining a cylindrical recess sized to receive the end portion, and to cover all of the lubricant apertures, of said nozzle.
10. The combination recited by claim 1 , wherein the outer diameter of said nozzle is determined to provide a close slip fit within the inner diameter of the internally threaded breech cavity of said rifle barrel.