WO2011146144A2 - Segmented composite barrel for weapon - Google Patents

Segmented composite barrel for weapon Download PDF

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Publication number
WO2011146144A2
WO2011146144A2 PCT/US2011/020330 US2011020330W WO2011146144A2 WO 2011146144 A2 WO2011146144 A2 WO 2011146144A2 US 2011020330 W US2011020330 W US 2011020330W WO 2011146144 A2 WO2011146144 A2 WO 2011146144A2
Authority
WO
WIPO (PCT)
Prior art keywords
liner
sleeve
gas port
accordance
length
Prior art date
Application number
PCT/US2011/020330
Other languages
French (fr)
Other versions
WO2011146144A3 (en
Inventor
Jason Christensen
Roland J. Christensen
Original Assignee
Jason Christensen
Christensen Roland J
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jason Christensen, Christensen Roland J filed Critical Jason Christensen
Publication of WO2011146144A2 publication Critical patent/WO2011146144A2/en
Publication of WO2011146144A3 publication Critical patent/WO2011146144A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • F41A21/04—Barrel liners
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00—Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02—Composite barrels, i.e. barrels having multiple layers, e.g. of different materials

Definitions

  • the present invention relates generally to composite barrels for weapons, such as rifles and automatic or semi-automatic weapons.
  • barrels face difficulties when incorporated into an automatic weapon.
  • barrel temperatures in automatic weapons can exceed the melting point of the composite or epoxy resin thereof.
  • some automatic weapons utilize gas-operated reloading in which high pressure gas from the fired cartridge is utilized to power a mechanism to expel the spent case and load a new cartridge.
  • the high pressure gas is taken from a gas port in the barrel downstream of the chamber.
  • the high temperature gas can degrade and/or melt the composite or epoxy resin around the gas port.
  • Simply wrapping the composite around a tube from the gas port has been found to sheer the tube as the liner and composite wrap have different coefficients of thermal expansion.
  • the invention provides a rifle barrel having a metallic liner with a longitudinal bore.
  • a thermally conductive sleeve circumscribes the liner substantially along a length of the liner.
  • a composite wrap circumscribes the sleeve substantially along a length of the sleeve.
  • the sleeve can include a carbon foam 1
  • a transverse gas port can extend through the liner to the bore intermediate along a length of the liner.
  • the composite wrap can be separated from the gas port.
  • the composite wrap can include two discrete wraps separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port.
  • a protrusion can be formed in the liner at the gas port and can correspond to the gap between the two discrete wraps.
  • the sleeve can include two discrete sleeves separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port and the protrusion.
  • the composite wrap can include two discrete wraps separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port.
  • a protrusion can be formed in the sleeve at the gas port and can correspond to the gap between the two discrete wraps.
  • the sleeve can include two discrete sleeves separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port.
  • the invention provides a method for manufacturing a rifle barrel, comprising: machining a liner from metal stock; machining a sleeve from stock; sliding the sleeve over the liner; and wrapping the sleeve with a composite wrap.
  • FIG. 1 is a cross-sectional side view of a barrel in accordance with an embodiment of the present invention.
  • FIG. 2 is a cross-sectional side view of another barrel in accordance with another embodiment of the present invention.
  • FIG. 3 is a cross-sectional side view of another barrel in accordance with another embodiment of the present invention.
  • FIG. 4 is a cross-sectional side view of another barrel in accordance with another embodiment of the present invention.
  • gas-operated automatic or semi-automatic rifle is used broadly to refer to an automatic or semi-automatic weapon (or both), whether configured as a rifle or a pistol, that utilizes a gas-operated reloading mechanism, and includes any weapon designated as an Ml 6, AK-47, M4, or versions including such designations.
  • carbon foam is used to refer to a microcellular carbon graphitic foam that contains an open-celled microcellular/carbon graphitic network created from carbon fiber precursors. Such carbon foam is rigid and self supporting, and can be obtained as preformed as stock or bar stock, and machined to the desired shape.
  • the carbon foam can be thermally conductive.
  • the carbon foam can have a thermal conductivity greater than higher than 50 W/mK.
  • the carbon foam can have a melting point greater than 2000 °C.
  • the carbon foam can have essentially a zero coefficient of thermal expansion through the operating temperature, or has essentially no thermal expansion.
  • a rifle barrel device indicated generally at 10, in an example implementation in accordance with the invention is shown.
  • Such a barrel 10 can 3
  • an automatic weapon or rifle such as an M 16 with a gas-operated reloading mechanism.
  • the barrel 10 can include a metallic liner 14 with a longitudinal bore 18.
  • the liner can be formed of metal, such as stainless steel, and can be manufactured by machining from blank material, such as rod stock.
  • the outer diameter and shape can be machined, such as on a lathe; while the inner bore can be formed by rifling, as is known in the art.
  • the liner can also include or can form a chamber.
  • the proximal end of the liner can have a greater outer diameter than a majority of the length of the liner to accommodate the chamber.
  • the outer diameter of the liner can taper or have a taper neat the proximal end and proximate the chamber.
  • the proximal end of the liner can have a greater inner diameter than the majority of the length of the liner and/or the distal end to accommodate the chamber.
  • the liner can include mechanism to secure the barrel to the stock or remainder of the rifle, such as screw threads at a proximal end.
  • An outer diameter of the distal end of the liner can have a flare or increased diameter with respect to an outer diameter of a majority of the length of the liner.
  • a thermally conductive sleeve 26 can circumscribe the liner 14 substantially along the length of the liner.
  • the sleeve can be formed of thermally conductive material, such as carbon foam, and can be manufactured by machining from blank material and sliding the sleeve over the liner. Alternatively, the sleeve can be machined as halves that can sandwich the liner.
  • the thermally conductive sleeve can have an interior shape and dimension that substantially matches the outer shape and diameter of the liner such that the inner surface of the sleeve abuts to the outer surface of the liner.
  • the sleeve can have a reduced thickness and/or tapered inner diameter at its proximal and/or distal ends to match the increased outer diameter of the liner at its proximal and/or distal ends.
  • the thermally conductive sleeve can conduct heat away from the liner during firing, particularly during rapid repeated firing, such as with an automatic weapon.
  • the thermally conductive sleeve can have a high heat tolerance and/or high melting point, for example approximately 2000 °C or more. It will be appreciated that the gases in the liner can be between approximately 1000-2000 °C.
  • a composite wrap 30 can circumscribe the sleeve 26 substantially along the length of the sleeve and liner.
  • the composite wrap can include a fiber in a resin matrix, such as 4
  • the composite wrap can be applied by winding, as is known in the art.
  • the composite wrap 30 is separated from the liner 14, and the heat associated therewith, by the thermally conductive sleeve 26.
  • the sleeve thus protects the composite wrap, or epoxy resin thereof.
  • the wrap can be longitudinally segmented to form two discrete wraps or segments separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to and to accommodate a gas port.
  • the proximal or rearward wrap can abut to a ring prior to the gas port.
  • a gas-operated automatic rifle barrel device 10b is shown that is similar in most respects to that described above, and which description is herein incorporated by reference.
  • the liner 14b has a transverse gas port 22 through the liner to the bore intermediate along a length of the liner.
  • the gas port can also extend through the sleeve 26b.
  • the gas port can extend through the composite wrap 30b.
  • the composite wrap can be separated from the gas port.
  • a metallic tube can be inserted through the gas port in the wrap and sleeve and can tap into the liner.
  • the gas port can be coupled by a gas tube of a gas-operated reloading mechanism, as is known in the art.
  • the composite wrap 30b is separated from the gas port 22 by the metallic tube and the sleeve.
  • the liner 14c has a gas port 22 through the liner to the bore intermediate along a length of the liner.
  • the gas port can be coupled by a gas tube of a gas-operated reloading mechanism, as is known in the art.
  • the composite wrap 30c is separated from the gas port 22.
  • the composite wrap 30c can be
  • the wraps can include rearward and forward wraps or segments, or proximal and distal wraps or segments.
  • the wraps can be wound separately. 5
  • a protrusion 38 can be formed in the liner 14c, such as by machining, at the gas port 22, and can corresponding to the gap between the two discrete wraps. Thus, the protrusion 38 separates the composite wrap, and epoxy resin thereof, from the gas port or gas tube.
  • the protrusion can be annular.
  • the sleeve 26c can be longitudinally segmented and can include two discrete sleeves longitudinally separated from one another along the length of the liner with a gap therebetween corresponding to the gas port and the protrusion.
  • the sleeves can include rearward and forward sleeves, or proximal and distal sleeves.
  • FIG. 4 another gas-operated automatic rifle barrel device lOd is shown that is similar in most respects to those described above, and which descriptions are herein incorporated by reference.
  • the sleeve 26d has a gas port 22d corresponding to the gas port 22 of the liner.
  • a protrusion 42 can be formed in the sleeve 26d at the gas port 22 and 22d and corresponding to the gap 38 and/or 42 between the two discrete wraps and/or sleeve 30d and/or 26d.
  • the protrusion can be annular. Thus, the composite wrap is separated from the gas port by the protrusion of the sleeve.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)

Abstract

A rifle barrel (10, 10b, 10c, 10d) for a gas-operated rifle includes a metallic liner (14, 14b, 14c, 14d) with a longitudinal bore and a transverse gas port (22, 22d) through the liner to the bore intermediate along a length of the liner. A thermally conductive sleeve (26, 26b, 26c, 26d) circumscribes the liner substantially along the length of the liner. A composite wrap circumscribes (30, 30b, 30c, 30d) the sleeve substantially along a length of the sleeve. The composite wrap is separated from the gas port.

Description

Segmented Composite Barrel for Weapon
BACKGROUND
Field of the Invention
The present invention relates generally to composite barrels for weapons, such as rifles and automatic or semi-automatic weapons.
Related Art
Light-weight, high-strength composite barrels have been developed with a carbon fiber wrap over a steel barrel liner. For example, see US Patent Nos. 5,804,756;
5,657,568; 5,692,334; 5,915,937; and 6,889,464.
Such barrels, however, face difficulties when incorporated into an automatic weapon. For example, barrel temperatures in automatic weapons can exceed the melting point of the composite or epoxy resin thereof. As another example, some automatic weapons utilize gas-operated reloading in which high pressure gas from the fired cartridge is utilized to power a mechanism to expel the spent case and load a new cartridge. The high pressure gas is taken from a gas port in the barrel downstream of the chamber. The high temperature gas can degrade and/or melt the composite or epoxy resin around the gas port. Simply wrapping the composite around a tube from the gas port has been found to sheer the tube as the liner and composite wrap have different coefficients of thermal expansion.
SUMMARY OF THE INVENTION
It has been recognized that it would be advantageous to develop a light-weight, high-strength composite barrel for weapons, such rifles or automatic or semi-automatic weapons.
The invention provides a rifle barrel having a metallic liner with a longitudinal bore. A thermally conductive sleeve circumscribes the liner substantially along a length of the liner. A composite wrap circumscribes the sleeve substantially along a length of the sleeve.
In accordance with a more detailed aspect of the invention, the sleeve can include a carbon foam 1
In accordance with another more detailed aspect of the invention, a transverse gas port can extend through the liner to the bore intermediate along a length of the liner. The composite wrap can be separated from the gas port.
In accordance with another more detailed aspect of the invention, the composite wrap can include two discrete wraps separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port. A protrusion can be formed in the liner at the gas port and can correspond to the gap between the two discrete wraps. The sleeve can include two discrete sleeves separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port and the protrusion.
In accordance with another more detailed aspect of the invention, the composite wrap can include two discrete wraps separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port. A protrusion can be formed in the sleeve at the gas port and can correspond to the gap between the two discrete wraps.
In accordance with another more detailed aspect of the invention, the sleeve can include two discrete sleeves separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port.
In addition, the invention provides a method for manufacturing a rifle barrel, comprising: machining a liner from metal stock; machining a sleeve from stock; sliding the sleeve over the liner; and wrapping the sleeve with a composite wrap.
BRIEF DESCRIPTION OF THE DRAWINGS
Additional features and advantages of the invention will be apparent from the detailed description which follows, taken in conjunction with the accompanying drawings, which together illustrate, by way of example, features of the invention; and, wherein:
FIG. 1 is a cross-sectional side view of a barrel in accordance with an embodiment of the present invention; 2
FIG. 2 is a cross-sectional side view of another barrel in accordance with another embodiment of the present invention;
FIG. 3 is a cross-sectional side view of another barrel in accordance with another embodiment of the present invention; and
FIG. 4 is a cross-sectional side view of another barrel in accordance with another embodiment of the present invention.
Reference will now be made to the exemplary embodiments illustrated, and specific language will be used herein to describe the same. It will nevertheless be understood that no limitation of the scope of the invention is thereby intended.
DETAILED DESCRIPTION OF EXAMPLE EMBODIMENT(S)
Definitions
The term "gas-operated automatic or semi-automatic rifle" is used broadly to refer to an automatic or semi-automatic weapon (or both), whether configured as a rifle or a pistol, that utilizes a gas-operated reloading mechanism, and includes any weapon designated as an Ml 6, AK-47, M4, or versions including such designations.
The term "carbon foam" is used to refer to a microcellular carbon graphitic foam that contains an open-celled microcellular/carbon graphitic network created from carbon fiber precursors. Such carbon foam is rigid and self supporting, and can be obtained as preformed as stock or bar stock, and machined to the desired shape. The carbon foam can be thermally conductive. For example, the carbon foam can have a thermal conductivity greater than higher than 50 W/mK. The carbon foam can have a melting point greater than 2000 °C. In addition, the carbon foam can have essentially a zero coefficient of thermal expansion through the operating temperature, or has essentially no thermal expansion.
Description
As illustrated in FIG. 1 , a rifle barrel device, indicated generally at 10, in an example implementation in accordance with the invention is shown. Such a barrel 10 can 3
be utilized in an automatic weapon or rifle, such as an M 16, with a gas-operated reloading mechanism.
The barrel 10 can include a metallic liner 14 with a longitudinal bore 18. The liner can be formed of metal, such as stainless steel, and can be manufactured by machining from blank material, such as rod stock. The outer diameter and shape can be machined, such as on a lathe; while the inner bore can be formed by rifling, as is known in the art. The liner can also include or can form a chamber. Thus, the proximal end of the liner can have a greater outer diameter than a majority of the length of the liner to accommodate the chamber. The outer diameter of the liner can taper or have a taper neat the proximal end and proximate the chamber. Similarly, the proximal end of the liner can have a greater inner diameter than the majority of the length of the liner and/or the distal end to accommodate the chamber. In addition, the liner can include mechanism to secure the barrel to the stock or remainder of the rifle, such as screw threads at a proximal end. An outer diameter of the distal end of the liner can have a flare or increased diameter with respect to an outer diameter of a majority of the length of the liner.
A thermally conductive sleeve 26 can circumscribe the liner 14 substantially along the length of the liner. The sleeve can be formed of thermally conductive material, such as carbon foam, and can be manufactured by machining from blank material and sliding the sleeve over the liner. Alternatively, the sleeve can be machined as halves that can sandwich the liner. The thermally conductive sleeve can have an interior shape and dimension that substantially matches the outer shape and diameter of the liner such that the inner surface of the sleeve abuts to the outer surface of the liner. Thus, the sleeve can have a reduced thickness and/or tapered inner diameter at its proximal and/or distal ends to match the increased outer diameter of the liner at its proximal and/or distal ends. The thermally conductive sleeve can conduct heat away from the liner during firing, particularly during rapid repeated firing, such as with an automatic weapon. The thermally conductive sleeve can have a high heat tolerance and/or high melting point, for example approximately 2000 °C or more. It will be appreciated that the gases in the liner can be between approximately 1000-2000 °C.
A composite wrap 30 can circumscribe the sleeve 26 substantially along the length of the sleeve and liner. The composite wrap can include a fiber in a resin matrix, such as 4
a carbon fiber. The composite wrap can be applied by winding, as is known in the art. Thus, the composite wrap 30 is separated from the liner 14, and the heat associated therewith, by the thermally conductive sleeve 26. The sleeve thus protects the composite wrap, or epoxy resin thereof. The wrap can be longitudinally segmented to form two discrete wraps or segments separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to and to accommodate a gas port. The proximal or rearward wrap can abut to a ring prior to the gas port.
Although described for use with an automatic weapon or rifle, it will be appreciated that the above barrel can be used with other types of weapons and rifles, including non-automatic rifles or semi-automatic rifles.
Referring to FIG. 2, a gas-operated automatic rifle barrel device 10b is shown that is similar in most respects to that described above, and which description is herein incorporated by reference. In addition, the liner 14b has a transverse gas port 22 through the liner to the bore intermediate along a length of the liner. In addition, the gas port can also extend through the sleeve 26b. Furthermore, the gas port can extend through the composite wrap 30b. The composite wrap can be separated from the gas port. For example, a metallic tube can be inserted through the gas port in the wrap and sleeve and can tap into the liner. The gas port can be coupled by a gas tube of a gas-operated reloading mechanism, as is known in the art. The composite wrap 30b is separated from the gas port 22 by the metallic tube and the sleeve.
Referring to FIG. 3, another gas-operated automatic rifle barrel device 10c is shown that is similar in most respects to that described above, and which descriptions are herein incorporated by reference. In addition, the liner 14c has a gas port 22 through the liner to the bore intermediate along a length of the liner. The gas port can be coupled by a gas tube of a gas-operated reloading mechanism, as is known in the art. The composite wrap 30c is separated from the gas port 22. The composite wrap 30c can be
longitudinally segmented into two discrete wraps or segments along the length of the liner and longitudinally separated from one another by a gap corresponding to the gas port 22. The wraps can include rearward and forward wraps or segments, or proximal and distal wraps or segments. The wraps can be wound separately. 5
A protrusion 38 can be formed in the liner 14c, such as by machining, at the gas port 22, and can corresponding to the gap between the two discrete wraps. Thus, the protrusion 38 separates the composite wrap, and epoxy resin thereof, from the gas port or gas tube. The protrusion can be annular.
In addition, the sleeve 26c can be longitudinally segmented and can include two discrete sleeves longitudinally separated from one another along the length of the liner with a gap therebetween corresponding to the gas port and the protrusion. The sleeves can include rearward and forward sleeves, or proximal and distal sleeves.
Referring to FIG. 4, another gas-operated automatic rifle barrel device lOd is shown that is similar in most respects to those described above, and which descriptions are herein incorporated by reference. In addition, the sleeve 26d has a gas port 22d corresponding to the gas port 22 of the liner.
A protrusion 42 can be formed in the sleeve 26d at the gas port 22 and 22d and corresponding to the gap 38 and/or 42 between the two discrete wraps and/or sleeve 30d and/or 26d. The protrusion can be annular. Thus, the composite wrap is separated from the gas port by the protrusion of the sleeve.
While the forgoing examples are illustrative of the principles of the present invention in one or more particular applications, it will be apparent to those of ordinary skill in the art that numerous modifications in form, usage and details of implementation can be made without the exercise of inventive faculty, and without departing from the principles and concepts of the invention. Accordingly, it is not intended that the invention be limited, except as by the claims set forth below.

Claims

6 CLAIMS
1. A rifle barrel device for a weapon, the device comprising:
a) a metallic liner with a longitudinal bore;
b) a thermally conductive sleeve circumscribing the liner substantially along a length of the liner; and
c) a composite wrap circumscribing the sleeve substantially along a length of the sleeve.
2. A device in accordance with claim 1 , further comprising:
a transverse gas port extending through the liner to the bore intermediate along a length of the liner; and
the composite wrap being separated from the gas port.
3. A device in accordance with claim 2, wherein the composite wrap includes two discrete wraps separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port.
4. A device in accordance with claim 3, further comprising:
a protrusion formed in the liner at the gas port and corresponding to the gap between the two discrete wraps.
5. A device in accordance with claim 4, wherein the sleeve includes two discrete sleeves separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port and the protrusion.
6. A device in accordance with claim 3, further comprising:
a protrusion formed in the sleeve at the gas port and corresponding to the gap between the two discrete wraps. 7
7. A device in accordance with claim 2, wherein the sleeve includes two discrete sleeves separated longitudinally from one another along the length of the liner with a gap therebetween corresponding to the gas port.
8. A device in accordance with claim 2, wherein the sleeve includes a gas port through the sleeve to the gas port of the liner.
9. A device in accordance with claim 2, further comprising:
a protrusion formed in the liner at the gas port.
10. A device in accordance with claim 2, further comprising:
a protrusion formed in the sleeve at the gas port.
1 1. A device in accordance with claim 2, wherein the sleeve is continuous along the length of the liner and includes a gas port aligned with the gas port of the liner; and wherein the wrap is longitudinally discontinuous along the length of the liner and includes a gap corresponding to the gas ports of the liner and the sleeve.
12. A device in accordance with claim 1 , wherein the sleeve includes a carbon foam.
13. A method for manufacturing the device of claim 1, comprising:
machining the liner from metal stock;
sliding the sleeve over the liner; and
wrapping the sleeve with the composite wrap in two separate longitudinal sections.
14. A method for manufacturing a rifle barrel for a rifle, comprising:
machining a liner from metal stock;
machining a sleeve from stock;
sliding the sleeve over the liner; and 8
wrapping the sleeve with a composite wrap.
15. A method in accordance with claim 14, wherein machining the sleeve includes machining the sleeve from carbon foam.
PCT/US2011/020330 2010-01-06 2011-01-06 Segmented composite barrel for weapon WO2011146144A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US29261610P 2010-01-06 2010-01-06
US61/292,616 2010-01-06
US12/985,040 US8677670B2 (en) 2010-01-06 2011-01-05 Segmented composite barrel for weapon
US12/985,040 2011-01-05

Publications (2)

Publication Number Publication Date
WO2011146144A2 true WO2011146144A2 (en) 2011-11-24
WO2011146144A3 WO2011146144A3 (en) 2012-03-15

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US (1) US8677670B2 (en)
WO (1) WO2011146144A2 (en)

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DE102014006081A1 (en) 2014-04-25 2015-10-29 Anja Glisovic Metal-metal matrix composite runs
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