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Enhanced service life bolt

a service life and bolt technology, applied in the field of enhanced service life bolts and improved bolt design for firearms, can solve the problems of increasing the wear and tear of the bolt lugs, and generating relatively high temperatures and pressures within the firearm during use, so as to achieve enhanced life and strengthen the tensile strength of materials. the effect of li

Inactive Publication Date: 2012-03-08
SMITH & WESSON
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]In view of the foregoing, it is an object of the present invention to provide a bolt for a firearm having an enhanced life.
[0008]It is another object of the present invention to provide a firearm having a stock, a receiver, a barrel, and a bolt having an enhanced life through the use of a stronger tensile strength material.
[0009]It is another object of the present invention to provide a bolt having an enhanced life through the use of a material that is heat treated for improved impact resistance.
[0010]It is yet another object of the present invention to provide a bolt having an enhanced life through the use of at least one low profile bolt lug located on both sides of the asymmetrical section of the bolt.
[0011]The present invention provides an enhanced life bolt for a firearm that includes the use of a maraging stainless steel, a heat treatment to provide maximum impact resistance and at least one low profile locking lug to reduce the bending moment of the lug most prone to wear to achieve a service life of the bolt in excess of that expected from known bolt designs.

Problems solved by technology

Such cartridges generate relatively high temperatures and pressures within the firearm during use.
One potential issue resulting from the combination of temperatures and pressures generated during firing is an increase in wear of the bolt, and particularly an increase in wear of the bolt lugs.
As a result of this increase in wear comes the possibility of reduced bolt life.

Method used

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Examples

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Embodiment Construction

[0017]Referring to FIG. 1, a prior art bolt design for the M4 / M16 family of rifles is shown. The bolt 12 has a proximal end 14, a distal end 16 terminating in bolt face 18 surrounded by an integral bolt head 20 and an integral cylindrical portion 22 disposed between the proximal end 14 and the distal end 16 along a longitudinal axis or bolt centerline 24. The bolt 12 also has a longitudinal opening 26 in the integral cylindrical portion 22 to receive an extractor 28.

[0018]As shown in FIG. 2, the bolt head 20 has a plurality of bolt lugs 30 with walls 32 extending integrally and radially outward therefrom. This prior art bolt design employs seven (7) lugs 30 to lock the bolt with the barrel extension during the firing of each round of ammunition. Each locking lug 30 is symmetrical and is substantially the same in terms of dimensional specifications. In addition, as further shown in FIG. 2, each locking lug is spaced the same distance, and extends outward the same distance, from the b...

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Abstract

A firearm having a stock and barrel attached to a receiver. Located within the receiver is an enhanced service life bolt. The enhanced service life bolt has a plurality of lugs. At least one lug has a reduced height that is shorter than the height of the other lugs. The enhanced service life bolt defines an extractor slot and the at least one reduced height lug is located adjacent to the extractor slot. The at least one reduced height lug is approximately twenty percent (20%) shorter than the other lugs. The enhanced service life bolt is constructed from a maraging stainless steel, such as 158 Carpenter Stainless Steel.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 61 / 380,806, filed Sep. 8, 2010, entitled “ENHANCED SERVICE LIFE BOLT”, the aforementioned application being hereby incorporated by reference in its entirety.FIELD OF THE INVENTION[0002]The present invention relates generally to firearms and, more particularly, to an improved bolt design for a firearm which enhances the service life of the bolt.BACKGROUND OF THE INVENTION[0003]Many service firearms, such as the M4 / M16 family of rifles, as discussed by Duncan Long in The AR-15 / M16 A Practical Guide, Paladin Press, 1985 incorporated in its entirety by reference, employ ammunition that generates high bullet energies and velocities. An example of such ammunition is the 5.56×45 mm NATO or “M855” cartridge. Such cartridges generate relatively high temperatures and pressures within the firearm during use. The M4 / M16 family of rifles typically employs a gas-operated bolt assemb...

Claims

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Application Information

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IPC IPC(8): F41A3/12
CPCF41A3/26
Inventor PICARD, RICHARDFINDLAY, DAVID
Owner SMITH & WESSON
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