Pre-stressed bore barrel and related manufacturing method

Abstract

Allows the reduction in the loss of precision of a discharge caused by the progressive heating-up of the barrel during a long succession of discharges, comprising at least: an interior rifled gunbore (1), an outer sleeve (2) mounted coaxially on the rifled gunbore (1) and configured with a high polar moment of inertia to support the strains in the rifled gunbore (1), while at the same time providing rigidity to the conjoined configuration, and a screwed union (3) adapted for the solid mutual fixation of said pieces. At least two holes (5, 6) are additionally provided which traverse the wall of the rifled gunbore (1) equilibrating the temperatures of said rifled gunbore (1) and said outer sleeve (2), in such a manner as to maintain the initially provided pre-strain of the barrel. The outer sleeve (2) may dispose an aperture for gases (1), adapted for the fitting of a repeat mechanism.

Description

OBJECT OF THE INVENTION[0001]The present invention relates to the field of firearms, more specifically to the characteristics and details of the barrels thereof.[0002]The present invention provides a barrel of a pre-strained rifled gunbore for a weapon which considerably reduces the loss of shot precision resulting from the progressive heating up of the barrel in a long succession of discharges.BACKGROUND OF THE INVENTION[0003]The problem with most barrels is the progressive heating-up thereof during a long succession of discharges. This increase in temperature results in expansion which releases strains accumulated in the material of the barrel during the fabrication process. When a critical temperature is reached, this all results in the inevitable loss of precision. In the barrels of a rifled gunbore, the barrel exhibits during the discharges a simple harmonic movement similar to that experienced by a cord when shaken by one of its extremes while the other end is free. According ...

AI Technical Summary

Benefits of technology

[0004]Attempts to alleviate this effect by providing the walls of the barrel with a greater thickness with the object of achieving greater rigidity are equivalent to simply making the cord thicker. This achieves nothing more than delaying the so feared loss of precision, given that the expansions which eventually appear are more permanent in nature as a result of the greater quantity of heat stored therein. It is also necessary to keep in mind, at th

Problems solved by technology

The problem with most barrels is the progressive heating-up thereof during a long succession of discharges.

This increase in temperature results in expansion which releases strains accumulated in the material of the barrel during the fabrication process.

When a critical temperature is reached, this all results in the inevitable loss of precision.

This ac

Images