US2911911A - Antifriction gascheck wads - Google Patents

Antifriction gascheck wads Download PDF

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Publication number
US2911911A
US2911911A US539035A US53903555A US2911911A US 2911911 A US2911911 A US 2911911A US 539035 A US539035 A US 539035A US 53903555 A US53903555 A US 53903555A US 2911911 A US2911911 A US 2911911A
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Prior art keywords
projectile
gascheck
disc
base
wads
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Expired - Lifetime
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US539035A
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Hobart S White
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Hobart S White
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42AMMUNITION; BLASTING
    • F42BEXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B14/00Projectiles or missiles characterised by arrangements for guiding or sealing them inside barrels, or for lubricating or cleaning barrels
    • F42B14/02Driving bands; Rotating bands

Description

Nov. 10, 1959 H. 5. WHITE 2,911,911
ANTIFRICTION GASCHECK WADS Filed Oct. 6. 1955 r 1 Pg. 4
5 INVENT OR 57 Ham-[2T5 WHITE BY m I 2,911,911 Patented Nov. 10, 1959 United States Patent ANTIFRICTION GASCHECK WADS Hobart S. White, Bethesda, Md. Application October 6, 1955, Serial No. 539,035
6Claims. (Cl. 102-38) (Granted under Title 35, US. Code (1952), see. 266) The invention described herein may be manufactured and used by or for the Government of the United States for governmental purposes without the payment to me of any royalty thereon, in accordance with the provisions of 35 United States Code (1952) section 266.
This invention relates to polytetrafiuoroethylene wads suitable in shape and size for positioning at the base of a projectile before or during the operation of seating the projectile in its case.
One object of this invention is to provide a gascheck which will insulate the base of the projectile from the hot gases of combustion.
Another object of this invention is to provide a seal which will prevent leakage of the combustion gases during the firing of a projectile.
Still another object of this invention is to provide means for depositing particles of a heat resistant lubricant such as polytetrafluoroethylene in the 'bore of a gun barrel when a projectile is fired, to provide low friction and also to prevent fouling of the gun bore.
The above objects result largely from the behavior characteristics exhibited by polytetrafiuoroethylene-when used as a gascheck wad, namely; excellent heat insulation and gas sealing ability without breakdown at high pressure and temperature ranges, and low coefiicient of friction.
In particular, in accordance with the principles of this invention it is possible to fire lead bullets, and lead bullets having conventional copper gaschecks, without the necessity of providing a lubricant on the bullets and without the danger of lead-fouling accumulating in the bore of the firearm. With existing ammunition it is necessary to provide grease or other forms of lubricant on lead bullets to prevent lead-fouling of the bore, as is well known. It will be apparent that the principles of this invention are not limited to lead bullets, but may be applied to projectiles of all types in general.
Other uses and advantages of the invention will become apparent upon reference to the specification and drawings in which Fig. 1 shows a conventional jacketed projectile-type bullet employing the novel gascheck wad of the instant invention;
Fig. 2 shows a modified form of the gascheck wad of Fig. 1 as used with a conventional boattail-type projectile, and
Figs. 3, 4, and 5 show various modifications of the gascheck wad of the instant invention as applied to solid projectiles.
The invention in this case is based on the inherent characteristics of substances such as polytetrafiuoroethylene. Such substance, for example, commercially pure Teflon manufactured by E. I. du Pont de Nemours and Company, exhibits characteristics of excellent heat insulation (poor heat conductivity), gas sealing characteristics at extremely high temperatures and pressures such as are encountered in the bore of a gun or rifle, and a low coefficient of friction.
The present invention contemplates providing such substance in the form of a gascheck wad of substantially the same diameter of the projectile in sealing engagement with the base of the projectile so that it will traverse the length of the gun-bore when the projectile is fired.
It has been found that a gascheck of such size and form may readily and inexpensively be associated with the base portion of a projectile so that when seated within its cartridge case, a unitary assembly including the gascheck is produced.
The diameter of the polytetrafiuoroethylene wads is made approximately the same as the diameter of the base of the projectiles in the modification where the wads are attached to the base of the projectile, or the diameter may be made slightly larger when a friction fit in the neck of the cartridge case is used to position the wads.
The length of these polytetrafluoroethylene wads is made sufiicient to prevent total decomposition of the wads within the bore of the barrel as the projectile traverses the bore. In general, the length of the polytetrafluoroethylene wads should not be less than one fourth the diameter of the projectile, but need not be greater than the diameter of the projectile.
The polytetrafluoroethylene employed for the gaschecks is of ordinary commercial purity as supplied by the E. I. du Pont de Nemours and Company under the trade name of Teflon. Small amounts of impurities or adulterants are tolerated, but relatively large amounts of adulterants, which might detract from the previously cited desired properties of polytetrafluoroethylene, cannot be tolerated within the scope of this invention.
Since the polytetrafluoroethylene employed for the gascheck exists as a wax-like solid it may be readily shaped and formed and secured to the projectile in a simple and efiicacious manner as disclosed in the drawings.
The gascheck is shown in the various embodiments suitable for application to a projectile in Figs. l-5. Generally, as indicated it is made in substantially cylindrical or disc-like form by any convenient method such as by molding, extruding or machining.
In its simplest form, the gascheck may be in the form of a simple cylinder 1 as shown in the modification of Fig. l. The gascheck wad 1 is formed to the proper diameter and thickness in accordance with the previously described criteria and is then inserted in the neck of the cartridge case 3 between the propellant 4 and the base of the projectile 2. In assembling the cartridge, the gascheck is frictionally held in place and is secured by the subsequent seating of the projectile 2 in the case 3 in a conventional manner.
The modification shown in Fig. l is particularly adapted for use with jacketed projectiles of the type shown in Fig. 1 where it would be difiicult or undesirable to interfere with the structure of the projectile. The gascheck wad shown in Fig. 2 is convenient for the type of projectile having the boattail shape generally indicated in Fig. 2. Fig. 2 shows a jacketed projectile having a lead body portion 5 and an enclosing jacket 6 of copper alloy or steel as is conventional. The standard taper 2a provided on the tailend of such type of projectile provides a convenient means for securing the gascheck to the projectile. Accordingly, the gascheck 1 in such modification is formed with an annular rim 1a as shown conforming to the taper of the tailend 2a of the projectile 2. The gascheckis secured to the base of the projectile with an appropriate cement (not shown) and the projectile is then inserted in the cartridge case as in Fig. '1.
Figs. 3, 4, and 5 show modifications of the gascheck which may conveniently be employed with solid or lead projectiles. The lack of a jacketing material in such projectiles permitsthe base'to' be conveniently shaped p j tile 2 s houldere o pro d a pro ectin dovetail 2b. The gascheck 1 in this modification is oppositely shaped to provide a recess or well 111 adapted to register with projection 212. Accordingly, a @Qflvehient means for securing the gascheck to the base of the projectile is provided by the dovetail engagement between the recess 1b and abutment 2b.
The gascheck 1 shown in the modification of,,Fig. 4 has the same elementary form as the modification of Fig. 1. In this case a small pin 7 or other fastener is employed to stake the gascheck 1 to the base of the projectile 2. Such securing means is Pecially suitable for use with lead core projectiles since the pin 7 need only be driven through the wad 1 and intothe..pro-.
V jectile 2.
In the modification shown in Fig. 5 the gascheck 1 has a concentric hole 1c such that his attached by friction fit to a mating appendage or concentric projection 2c at the base of the projectile 2. o
It will be apparent that the embodiments shown are only exemplary and that various modifications can be made within the scope of invention as defined in the appended claims.
' What is claimed is:
1. In combination with an ammunition cartridge of the type employing a projectile and propellant-containing cartridge case, a gascheck wad comprising a disc of sub.
" covering said base. 7
2. The invention of claiml in which the diameter of said polytetrafluoroethylene gascheck wad is slightly larger than the diameter of the projectile whereby said gascheck wad is frictionally held in said juxtaposition by frictional engagement with the inner wall of the cartridge case.
71 said p ojectile ewv e dwi h a de ai Pro e and said securing meahs'comprises a mating recess in said gascheck disc in. whieh. said. projection is seated.
e n ent ne laim 1 in whi said secu means comprises a fastener traversing the length of said e gflsfiheck disc nd imbedded in the base portion of said iaine e projectile said disc being secured to the base of said P oject le withthe d sc ence a c to and co e the base of said projectile and said tapered wall seating over sa d hea -t iled e s tv References Cited in the file of this pat ent v UNI ED STATES PA EN 4.07.399 1889 1,031,320 July 2, 19.12 1,944,834 Gerlich Jan. 30, 1934 2 306, 40 42 2,559 2 5 y 3, '1951 2,6 3,259 -1, V Dec; 22, 1953 2,669g930 Darby Feb. 23,1195!!- Z,6? ,,87 Tait 9, 9 2,731,360 ,Love V Jan..17,- 1956 2,82 ,412" Beeuwkes n, 21, 1958 I I FOREIGN PATENTS 707,065 I 'Great Britain Apr. 14, 1954

Claims (1)

  1. 6. IN COMBINATIONS WITH AN AMMUNITION CARTRIDGE OF THE TYPE EMPLOYING A BOAT-TAILED PROJECTILE, A GASCHECK WARD COMPRISING AN IMPERFORATE DISC MADE OF SUBSTANTIALLY PURE POLYTETRAFLUOROETHYLENE, SAID DISC HAVING A DIAMETER SUBSTANTALLY EQUAL TO THAT OF THE PROJECTILE AND A LENGTH HAVING A RANGE VARYING BETWEEN 1/4 AND THE DIAMETER OF SAID PROJECTILE, AN ANNULAR SHOULDER ON SAID DISC, SAID SHOULDER HAVING AN INERT TAPERED WALL CONFORMING TO THE TAPER OF THE BOAT-TAILED PORTION OF SAID PROJECTILE SAID DISC BEING SECURED TO THE BASE OF SAID PROJECTILE WITH THE DISC CONCENTRIC TO AND COVERING THE BASE OF SAID PROJECTILE AND SAID TAPERED WALL SEATING OVER SAID BOAT-TAILED PORTION.
US539035A 1955-10-06 1955-10-06 Antifriction gascheck wads Expired - Lifetime US2911911A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040662A (en) * 1959-11-19 1962-06-26 William A Zisman Bullets
US3127836A (en) * 1962-04-24 1964-04-07 Olin Mathieson Abattoir device
US3137195A (en) * 1961-11-20 1964-06-16 American Internat Tool Corp Centering and guiding means for metal studs
US3170363A (en) * 1961-11-06 1965-02-23 Hi Shear Corp Explosive separable nut
US3186342A (en) * 1962-09-19 1965-06-01 Jr Albert S Hancock Two-stage bullet
US3361385A (en) * 1965-04-02 1968-01-02 Bert B. Gould Miniature ballistic rocket
US3386380A (en) * 1967-01-04 1968-06-04 Francis Gus Method and apparatus for propelling projectiles for space and other applications
US3910194A (en) * 1971-02-01 1975-10-07 Hercules Inc Projectile rotating band
US3968750A (en) * 1972-03-22 1976-07-13 Nederlandsche Wapen- En Munitiefabriek "De Kruithoorn" B.V. Projectile-case connection
US4008665A (en) * 1973-09-06 1977-02-22 Dynamit Nobel Aktiengesellschaft Training ammunition
DE3501191A1 (en) * 1985-01-16 1986-07-17 Dynamit Nobel Ag BULLET CARTRIDGE
WO1992003693A1 (en) * 1990-08-23 1992-03-05 International Shooter Development Fund, Inc. Match-grade rifle cartridge with improved components
US5458064A (en) * 1994-04-29 1995-10-17 Kearns; Robert M. Firearm projectile
US5860866A (en) * 1994-06-20 1999-01-19 Illinois Tool Works Inc. Steel pin and method for its manufacture
US6763765B2 (en) 2001-09-27 2004-07-20 Harold Crowson Break-away gas check for muzzle-loading firearms
US6796068B2 (en) 2000-09-05 2004-09-28 Harold Crowson Muzzleloading bullet with expanding pin for gas check
US20050115451A1 (en) * 2001-09-27 2005-06-02 Harold Crowson Break-away gas check for muzzle-loading firearms
US20050257711A1 (en) * 1999-01-15 2005-11-24 Natec, Inc. A Cartridge Casing Body And An Ammunition Article Having A Cartridge Casing Body Wherein The Cartridge Casing Body Is Plastic, Ceramic, Or A Composite Material
US20060027130A1 (en) * 2004-08-05 2006-02-09 Parker Bobby J Muzzle loading bullet with gas seal
US7380505B1 (en) * 2006-06-29 2008-06-03 Shiery Jeffrey C Muzzleloading firearm projectile
ITCT20080018A1 (en) * 2008-12-04 2009-03-05 Fabio Occhipinti Construction of gas-check bullets obtained from non-metallic laminates.
US7827915B1 (en) 2001-09-27 2010-11-09 Accura Bullets Gas check with system for improved loading and retention in bore of muzzleloading firearms
US20110048272A1 (en) * 2001-09-27 2011-03-03 Hall Daniel W Gas check with system for improved loading and retention in bore of muzzleloading firearms
US7987624B1 (en) * 1982-07-14 2011-08-02 Moeller Tilo Flashless electric firearm and ammunition therefor
US20130284045A1 (en) * 2011-02-01 2013-10-31 Korea Nuclear Engineering Co., Ltd. Ammunition
US20180364017A1 (en) * 2015-10-21 2018-12-20 Vista Outdoor Operations Llc Reduced drag projectiles
USD849874S1 (en) 2018-01-21 2019-05-28 Vista Outdoor Operations Llc Muzzleloader propellant cartridge

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US407890A (en) * 1889-07-30 Lubricating projectile
US1031320A (en) * 1910-12-13 1912-07-02 John H Brown Projectile.
US1944884A (en) * 1930-03-15 1934-01-30 Gustav Hermann Ernst Bullet
US2306140A (en) * 1940-09-27 1942-12-22 George E Dieckman Projectile and bullet
US2559275A (en) * 1947-07-03 1951-07-03 Remington Arms Co Inc Cellular plastic wad
US2663259A (en) * 1951-03-23 1953-12-22 Remington Arms Co Inc Ammunition
US2669930A (en) * 1946-01-05 1954-02-23 Remington Arms Co Inc Sabot projectile
GB707065A (en) * 1951-04-06 1954-04-14 Glacier Co Ltd Improved method of incorporating a solid lubricating substance into a receptive metallic surface
US2691814A (en) * 1952-11-24 1954-10-19 Glacier Co Ltd Polytetrafluorethylene impregnated bearings
US2731360A (en) * 1951-04-06 1956-01-17 Glacier Co Ltd Method for incorporating a solid lubricant into a porous metallic surface
US2820412A (en) * 1948-10-20 1958-01-21 Jr Reinier Beeuwkes Projectile for firearms

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US407890A (en) * 1889-07-30 Lubricating projectile
US1031320A (en) * 1910-12-13 1912-07-02 John H Brown Projectile.
US1944884A (en) * 1930-03-15 1934-01-30 Gustav Hermann Ernst Bullet
US2306140A (en) * 1940-09-27 1942-12-22 George E Dieckman Projectile and bullet
US2669930A (en) * 1946-01-05 1954-02-23 Remington Arms Co Inc Sabot projectile
US2559275A (en) * 1947-07-03 1951-07-03 Remington Arms Co Inc Cellular plastic wad
US2820412A (en) * 1948-10-20 1958-01-21 Jr Reinier Beeuwkes Projectile for firearms
US2663259A (en) * 1951-03-23 1953-12-22 Remington Arms Co Inc Ammunition
GB707065A (en) * 1951-04-06 1954-04-14 Glacier Co Ltd Improved method of incorporating a solid lubricating substance into a receptive metallic surface
US2731360A (en) * 1951-04-06 1956-01-17 Glacier Co Ltd Method for incorporating a solid lubricant into a porous metallic surface
US2691814A (en) * 1952-11-24 1954-10-19 Glacier Co Ltd Polytetrafluorethylene impregnated bearings

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040662A (en) * 1959-11-19 1962-06-26 William A Zisman Bullets
US3170363A (en) * 1961-11-06 1965-02-23 Hi Shear Corp Explosive separable nut
US3137195A (en) * 1961-11-20 1964-06-16 American Internat Tool Corp Centering and guiding means for metal studs
US3127836A (en) * 1962-04-24 1964-04-07 Olin Mathieson Abattoir device
US3186342A (en) * 1962-09-19 1965-06-01 Jr Albert S Hancock Two-stage bullet
US3361385A (en) * 1965-04-02 1968-01-02 Bert B. Gould Miniature ballistic rocket
US3386380A (en) * 1967-01-04 1968-06-04 Francis Gus Method and apparatus for propelling projectiles for space and other applications
US3910194A (en) * 1971-02-01 1975-10-07 Hercules Inc Projectile rotating band
US3968750A (en) * 1972-03-22 1976-07-13 Nederlandsche Wapen- En Munitiefabriek "De Kruithoorn" B.V. Projectile-case connection
US4008665A (en) * 1973-09-06 1977-02-22 Dynamit Nobel Aktiengesellschaft Training ammunition
US7987624B1 (en) * 1982-07-14 2011-08-02 Moeller Tilo Flashless electric firearm and ammunition therefor
DE3501191A1 (en) * 1985-01-16 1986-07-17 Dynamit Nobel Ag BULLET CARTRIDGE
WO1992003693A1 (en) * 1990-08-23 1992-03-05 International Shooter Development Fund, Inc. Match-grade rifle cartridge with improved components
US5275108A (en) * 1990-08-23 1994-01-04 Endowment Fund Of The International Shooter Development Fund, Inc. Match-grade rifle cartridge with improved components
US5458064A (en) * 1994-04-29 1995-10-17 Kearns; Robert M. Firearm projectile
US5621187A (en) * 1994-04-29 1997-04-15 Kearns; Robert Method for loading a muzzle-loading firearm
US5860866A (en) * 1994-06-20 1999-01-19 Illinois Tool Works Inc. Steel pin and method for its manufacture
US20050257711A1 (en) * 1999-01-15 2005-11-24 Natec, Inc. A Cartridge Casing Body And An Ammunition Article Having A Cartridge Casing Body Wherein The Cartridge Casing Body Is Plastic, Ceramic, Or A Composite Material
US6796068B2 (en) 2000-09-05 2004-09-28 Harold Crowson Muzzleloading bullet with expanding pin for gas check
US7827915B1 (en) 2001-09-27 2010-11-09 Accura Bullets Gas check with system for improved loading and retention in bore of muzzleloading firearms
US20050115451A1 (en) * 2001-09-27 2005-06-02 Harold Crowson Break-away gas check for muzzle-loading firearms
US6763765B2 (en) 2001-09-27 2004-07-20 Harold Crowson Break-away gas check for muzzle-loading firearms
US20110048272A1 (en) * 2001-09-27 2011-03-03 Hall Daniel W Gas check with system for improved loading and retention in bore of muzzleloading firearms
US20060027130A1 (en) * 2004-08-05 2006-02-09 Parker Bobby J Muzzle loading bullet with gas seal
US7380505B1 (en) * 2006-06-29 2008-06-03 Shiery Jeffrey C Muzzleloading firearm projectile
ITCT20080018A1 (en) * 2008-12-04 2009-03-05 Fabio Occhipinti Construction of gas-check bullets obtained from non-metallic laminates.
US20130284045A1 (en) * 2011-02-01 2013-10-31 Korea Nuclear Engineering Co., Ltd. Ammunition
US8904941B2 (en) * 2011-02-01 2014-12-09 Korea Nuclear Engineering Co., Ltd. Ammunition
US20180364017A1 (en) * 2015-10-21 2018-12-20 Vista Outdoor Operations Llc Reduced drag projectiles
US10684108B2 (en) * 2015-10-21 2020-06-16 Vista Outdoor Operations Llc Reduced drag projectiles
USD849874S1 (en) 2018-01-21 2019-05-28 Vista Outdoor Operations Llc Muzzleloader propellant cartridge

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