US2981155A - Composite gun barrels - Google Patents

Composite gun barrels Download PDF

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Publication number
US2981155A
US2981155A US340198A US34019853A US2981155A US 2981155 A US2981155 A US 2981155A US 340198 A US340198 A US 340198A US 34019853 A US34019853 A US 34019853A US 2981155 A US2981155 A US 2981155A
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United States
Prior art keywords
shell
barrel
outside
gun barrels
steel
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Expired - Lifetime
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US340198A
Inventor
Parlanti Conrad Authony
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Parlanti Conrad Authony
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Priority to US340198A priority Critical patent/US2981155A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B22CASTING; POWDER METALLURGY
    • B22DCASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D19/00Casting in, on, or around objects which form part of the product
    • B22D19/08Casting in, on, or around objects which form part of the product for building-up linings or coverings, e.g. of anti-frictional metal
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/02Composite barrels, i.e. barrels having multiple layers, e.g. of different materials
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/20Barrels or gun tubes characterised by the material
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41WEAPONS
    • F41AFUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A21/00Barrels; Gun tubes; Muzzle attachments; Barrel mounting means
    • F41A21/24Barrels or gun tubes with fins or ribs, e.g. for cooling

Description

m M RA A? ML N mm W m VP W W A A h 2 w \\/l 1 R K N I 0 c H V M 6 FIG. 3.

United States Patent COMPOSITE GUN BARRELS Conrad Anthony Parlanti, 34 W. Hill Road, Herne Bay, Kent, England Filed Mar. 4, 1953, Ser. No. 340,198

4 Claims. (Cl. 89-16) This invention relates to gun barrels and to methods of making the same.

It is known that the increasingly high muzzel velocities which are being used in modern guns produce greatly increased friction forces as the projectile travels through the gun barrel. This in turn results in the generation of increased heat, and in cases where rapid firing is required, the low thermal conductivity of steel frequently causes localized accumulations of heat which result in distortion of the barrel.

It is an object of the present invention to provide a gun barrel in which provision is made for rapid transfer and dissipation of heat.

It is a further object of the invention to provide methods of making such gun barrels.

Other objects and advantages of the invention will appear hereinafter. I

A preferred embodiment of the invention selected for purposes of illustration is shown in the accompanying drawings, in which,

Figure 1 is an elevation of a core suitable for use in casting a gun barrel shell embodying the invention.

Figure 2 is a longitudinal section through the core and cast shell. 1

Figure 3 is a longitudinal section through a completed barrel.

Referring to the drawings, the gun barrel illustrated in Figure 3 comprises a relatively thin shell 1 of steel and an outside casing 2 of aluminum or aluminum alloy containing at least 70% aluminum. The inside surface of the steel shell has rifle grooves 3 and lands 4 formed therein and the outside surface is surrounded by and in contact with a casing 2 throughout its entire length, or at least throughout a substantial portion of its length.

The outside of the casing 2 is provided with cooling fins 5 to aid the transfer of heat, and the outside surface of the casing, including the fins is treated to provide a thin outside layer of aluminum oxide, which, I have found, greatly increases the rate of heat transfer. If desired, the fins 5 may be machined down to heights indicated by broken line 6 to modify the rate of heat transfer at various points along the barrel as may be desired. The contour of the curve 6 for any type of gun may be determined by suitable firing tests.

' The preferred method of making a gun barrel as above described'is as follows. Referring to Figure 1, a core 11 of aluminum or aluminum alloy is first prepared, said core having a substantially cylindrical center section and enlarged end sections 13 provided with cooling fins 14. The outside surface of section 12 is provided with rifle grooves 15 andlands 16 which are the reverse (negative) of the grooves and lands of the rifling desired on the interior of the barrel.

The outside surface of the core including the end sections is then treated to provide a thin layer of aluminum oxide, preferably by one of the well known anodizing processes. This has a two fold effect in the subsequent ice 21 cylindrical cavity surrounding the center section 12 and a cylindrical steel shell 1A (Figure 2) is cast around the center section. The shell should be of substantial thickness, as for example, from 1" to 2". The shell may now be subjected to any desired heat treatment, and in the course of this treatment the core melts and runs out of the shell. Subsequently, the outside of the shell 1A is machined down to provide the shell 1 having a thickness (measured from the bottom of the rifle grooves) of approximately 0.1".

This shell is now placed in another casting mold in which it serves as a core around which the casing 2 is cast. Preferably, the mold is constructed and the casting operation is conducted in accordance with the invention disclosed 'in my prior application Serial No. 225,296, filed May 9, 1951, now Patent No. 2,759,231.

Subsequently, the exposed aluminum surfaces of the barrel are treated to provide a thin layer of aluminum oxide thereon for purposes previously described. This is preferably done. by one of the'well known anodizing processes, the ends of the barrel being sealed during the treatment to prevent the electrolyte from affecting the steel.

Thereafter, the barrel may be mounted on a lathe and the rifling may be accurately machined to the desired size. Also the cooling fins may be cut to any contour desired by the designer to provide proper cooling characteristics.

It will be understood that the drawings herein are merely representative and are not intended to portray any actual gun barrel in accurate proportions.

It will be understood that the invention may be variously modified and embodied within the scope of the subjoined claims.

I claim as my invention:

'1. A gun barrel comprising a relatively thin cylindrical shell of steel, the insidesurface of said shell having rifle grooves and lands formed therein, the inside diameter of said shell being greatly in excess of the wall thickness thereof, and an outside casing of metal containing not less than 70% 7 aluminum surrounding said shell and in direct, fixed contact therewith throughout substantially its entire length, said outside casing having a thickness substantially greater than the thickness of said shell of steel.

2. A gun barrel according to claim 1 in which the outside of said casing consists of a thin layer of aluminum oxide.

3.'A gun barrel according to claim 1 in which the outside of said case has been anodized.

4. A gun barrel according to claim 1 in which the thickness of said shell of steel is approximately 0.1".

US340198A 1953-03-04 1953-03-04 Composite gun barrels Expired - Lifetime US2981155A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US340198A US2981155A (en) 1953-03-04 1953-03-04 Composite gun barrels

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US340198A US2981155A (en) 1953-03-04 1953-03-04 Composite gun barrels
BE531147D BE531147A (en) 1953-03-04 1954-08-13
FR1106858D FR1106858A (en) 1953-03-04 1954-08-18 Improvements to barrel tubes and their manufacturing processes

Publications (1)

Publication Number Publication Date
US2981155A true US2981155A (en) 1961-04-25

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US340198A Expired - Lifetime US2981155A (en) 1953-03-04 1953-03-04 Composite gun barrels

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US (1) US2981155A (en)
BE (1) BE531147A (en)
FR (1) FR1106858A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118243A (en) * 1964-01-21 Rifled barrel for firearms
US4641567A (en) * 1983-05-31 1987-02-10 Ga Technologies Inc. Barrel assembly for electromagnetic rail gun
US5448848A (en) * 1993-09-15 1995-09-12 Briley Manufacturing Co. Shotgun having light weight interchangeable barrel tubes
US6758004B2 (en) * 1999-05-14 2004-07-06 Michaels Of Oregon Co. Firearm barrel manufacturing methods and barrel assemblies
US20070193102A1 (en) * 2006-02-23 2007-08-23 Briggs Vernon R Composite firearm barrel
US7735408B1 (en) * 2004-10-14 2010-06-15 The United States Of America As Represented By The Secretary Of The Army Mortar tube with cooling fin
US20100307045A1 (en) * 2007-11-02 2010-12-09 Transmission Systems Limited Projectile Weapons
US7921590B2 (en) 2006-02-23 2011-04-12 Strum, Ruger & Company, Inc. Composite firearm barrel reinforcement
US20150000645A1 (en) * 2012-01-13 2015-01-01 Gamo Outdoors, S.L. Method for the manufacture of a barrel for compressed air or co2 rifles and barrel for compressed air or co2 rifles obtained

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1136613B (en) * 1957-05-06 1962-09-13 Olin Mathieson Compound gun barrel
US4577431A (en) * 1984-05-02 1986-03-25 General Electric Company Wear resistant gun barrel and method of forming

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1553825A (en) * 1925-03-28 1925-09-15 Tracy C Dickson Method of making guns and other hollow metal articles
US1986837A (en) * 1933-05-10 1935-01-08 George M Mccann Gun
US2112144A (en) * 1932-07-28 1938-03-22 Secretary Of War Of The United Means for cooling gun barrels
US2137259A (en) * 1935-12-14 1938-11-22 Winchester Repeating Arms Co Composite firearm barrel
US2238670A (en) * 1936-11-13 1941-04-15 Commerciale Caproni Comp Gun barrel
US2287066A (en) * 1940-08-21 1942-06-23 George D Rogers Heat exchange unit
US2331477A (en) * 1942-09-18 1943-10-12 Alexander W Keema Method of producing guns
US2375721A (en) * 1940-06-05 1945-05-08 Dryden Kuser Automatic rifle
US2736119A (en) * 1956-02-28 Firearm having chamber member

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2736119A (en) * 1956-02-28 Firearm having chamber member
US1553825A (en) * 1925-03-28 1925-09-15 Tracy C Dickson Method of making guns and other hollow metal articles
US2112144A (en) * 1932-07-28 1938-03-22 Secretary Of War Of The United Means for cooling gun barrels
US1986837A (en) * 1933-05-10 1935-01-08 George M Mccann Gun
US2137259A (en) * 1935-12-14 1938-11-22 Winchester Repeating Arms Co Composite firearm barrel
US2238670A (en) * 1936-11-13 1941-04-15 Commerciale Caproni Comp Gun barrel
US2375721A (en) * 1940-06-05 1945-05-08 Dryden Kuser Automatic rifle
US2287066A (en) * 1940-08-21 1942-06-23 George D Rogers Heat exchange unit
US2331477A (en) * 1942-09-18 1943-10-12 Alexander W Keema Method of producing guns

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3118243A (en) * 1964-01-21 Rifled barrel for firearms
US4641567A (en) * 1983-05-31 1987-02-10 Ga Technologies Inc. Barrel assembly for electromagnetic rail gun
US5448848A (en) * 1993-09-15 1995-09-12 Briley Manufacturing Co. Shotgun having light weight interchangeable barrel tubes
US6758004B2 (en) * 1999-05-14 2004-07-06 Michaels Of Oregon Co. Firearm barrel manufacturing methods and barrel assemblies
US20040216350A1 (en) * 1999-05-14 2004-11-04 Michaels Of Oregon Co. Composite firearm barrel assemblies
US7152357B2 (en) 1999-05-14 2006-12-26 Michaels Of Oregon Co. Composite firearm barrel assemblies
US7735408B1 (en) * 2004-10-14 2010-06-15 The United States Of America As Represented By The Secretary Of The Army Mortar tube with cooling fin
US20070193102A1 (en) * 2006-02-23 2007-08-23 Briggs Vernon R Composite firearm barrel
US7921590B2 (en) 2006-02-23 2011-04-12 Strum, Ruger & Company, Inc. Composite firearm barrel reinforcement
US7934332B2 (en) 2006-02-23 2011-05-03 Sturm, Ruger & Company, Inc. Composite firearm barrel
US8316568B2 (en) 2006-02-23 2012-11-27 Sturm, Ruger & Company, Inc. Composite firearm barrel reinforcement
US20100307045A1 (en) * 2007-11-02 2010-12-09 Transmission Systems Limited Projectile Weapons
US8291632B2 (en) * 2007-11-02 2012-10-23 Transmission Systems Limited Projectile weapons
US20150000645A1 (en) * 2012-01-13 2015-01-01 Gamo Outdoors, S.L. Method for the manufacture of a barrel for compressed air or co2 rifles and barrel for compressed air or co2 rifles obtained
US9261316B2 (en) * 2012-01-13 2016-02-16 Gamo Outdoor, S.L. Method for the manufacture of a barrel for compressed air or CO2 rifles and barrel for compressed air or CO2 rifles obtained

Also Published As

Publication number Publication date
FR1106858A (en) 1955-12-23
BE531147A (en) 1957-11-08

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