US2381083A - Cartridge case - Google Patents

Cartridge case Download PDF

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Publication number
US2381083A
US2381083A US481145A US48114543A US2381083A US 2381083 A US2381083 A US 2381083A US 481145 A US481145 A US 481145A US 48114543 A US48114543 A US 48114543A US 2381083 A US2381083 A US 2381083A
Authority
US
United States
Prior art keywords
cap
cap chamber
chamber
cavity
case
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US481145A
Other languages
English (en)
Inventor
Shufflebotham John Sidney
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries Ltd
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 Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Application granted granted Critical
Publication of US2381083A publication Critical patent/US2381083A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
    • F42B5/00—Cartridge ammunition, e.g. separately-loaded propellant charges
    • F42B5/26—Cartridge cases
    • F42B5/36—Cartridge cases modified for housing an integral firing-cap
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S29/00—Metal working
    • Y10S29/035—Shrink fitting with other step
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49826—Assembling or joining
    • Y10T29/49833—Punching, piercing or reaming part by surface of second part

Definitions

  • the present invention therefore comprises moulding the *cartridgecas'e froma thermoplastic material with a cavity in the base slightly smaller in "diameter than the external diameter -o' f"-the cap chamber, heating the-cap chamber to'atemperature greater than "-thefsoftening temperature of the thermoplastic material, pushing the-heated cap chamber into the cavity, and thereafter inserting the cap into the ⁇ cap chamber when the latter has cooled.
  • the difference in diameter between the] cap chamber and thecav'ityin the base is preferably 0.010 to 0.'020inch.
  • the temperature to which the cap "chamber is heated is preferably 30to 120 Crhig'her thanthe softening temperatureof the thermoplastic ina terial, provide'd'that it does not exceed the tem perature at which visible 'oxi'dationand tarnishing of the metal of "which *the cap chamber "is composed begins to occur.
  • this temperature is about 200.C; and the chambers should therefore .not be heated above 200" C.
  • Figure 1 represents a longitudinal cross-section of the base of a shotgun cartridge case showing the cap chamber'before the insertion'thereof;
  • Figure 2 is similar to Figure ,lgbutshowing the cap chamber and primer inserted in position?
  • the latter is heated to the required temperature and pressed into the cavity, and the cap 5 and anvil 6 are then inserted in position.
  • a shotgun cartridge case was moulded from a suitably plasticized cellulose acetate composition, the diameter of the cavity in the base portion being formed 0.016 inch smaller than the external diameter of the cap chamber. The latter was heated to 190 C. and was then pressed into the cavity. After cooling the assembly was then completed by the insertion of the primer into the cap chamber.
  • the present invention is of particular use in its application to the manufacture of cartridges of the smaller types, such as for example small bore shotgun cartridges, in which the liability to the setting up of any deformation strains on pressing in the cap chamber in the cold is proportionately greater than in the case of larger types of cartridges.
  • the new and improved method of manufacing cartridge cases which consists in moulding the case of a thermoplastic material with a capreceiving cavity in the base slightlysmaller in diameter than the external diameter of a cap chamber, forming a cap chamberpf material of higher heat resistance than that of the material of the cartridge case, heating the cap chamber to a temperature higher than the softening temperature of the thermoplastic material, forcing the heated cap chamber into the capreceiving cavity in the base of the cartridge case to soften the wall of the cap cavity, and cooling the assembled case and cap chamber to set the thermoplastic material about the cap chamber.
  • the new and improved method of manuf-acturing cartridge cases which consists in moulding the case of a thermoplastic material with a cap-receiving cavity in the base slightly smaller in diameter than the external diameter of a cap chamber and having a smooth uninterrupted inner wall, forming a cap chamber with a smooth uninterrupted outer wall of metal, heating the cap chamber to a temperature higher than the softening temperature of the thermoplastic material, forcing the heated cap chamber into the cap-receiving cavity in the base of the cartridge case to soften the wall of the cap cavity, and cooling the assembled case and cap chamber to set the thermoplastic material about the cap chamber.
  • the new and improved method of manufacturing cartridge cases which consists in moulding the case of a thermoplastic material with a cap-receiving cavity in the base slightly smaller in diameter than the external diameter of a cap chamber and having a smooth uninterrupted inner wall, forming a cap chamber of metal and having a smooth uninterrupted outer wall, heating the cap chamber to a temperature higher than the softening temperature of the thermoplastic material, forcing the heated cap chamber into the cap-receiving cavity in the base of the cartridge case to soften the wall of the cap 10 I -a smooth uninterrupted outer wall, heating the cavity, and cooling the assembled case and cap chamber to set the thermoplastic material about the cap chamber.
  • the new and improved method of manufacturing cartridge cases which consists in moulding the case of a thermoplastic material with a cap-receiving cavity in the base slightly smaller in diameter than the external diameter of a cap chamber and having a smooth uninterrupted inner wall, forming a cap chamber of metal with cap chamber to a degree higher than the softening temperature of the thermoplastic material but below the heat tarnishing point of the metal, forcing the heated cap chamber into the capreceiving cavity in the base of the cartridge case to soften the wall of the cap cavity, and cooling the assembled case and cap chamber to set the thermoplastic material about the cap chamber.
  • the new and improved method of manuiacturing cartridge cases which consists in mould: ing the case of a thermoplastic material with a cap-receiving cavity in the base slightly smaller in diameter than the external diameter of a cap chamber, forming a cap chamber of material of higher heat resistance than that of the material of the cartridge case and having an external diameter from 0.010 to 0.020 inch larger than the cavity in the base of the case, heating the cap chamber to a temperaturehigher than the softening temperature of the thermoplastic material, forcing the heated cap chamber into the cap-receiving cavity in the base of the cartridge case to soften the wall of the cap cavity,

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
US481145A 1941-10-28 1943-03-30 Cartridge case Expired - Lifetime US2381083A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2381083X 1941-10-28

Publications (1)

Publication Number Publication Date
US2381083A true US2381083A (en) 1945-08-07

Family

ID=10905285

Family Applications (1)

Application Number Title Priority Date Filing Date
US481145A Expired - Lifetime US2381083A (en) 1941-10-28 1943-03-30 Cartridge case

Country Status (3)

Country Link
US (1) US2381083A (xx)
BE (1) BE459375A (xx)
FR (1) FR911257A (xx)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2529863A (en) * 1948-10-30 1950-11-14 Goodrich Co B F Method and apparatus for making hard thermoplastic tube assemblies
US2559278A (en) * 1944-10-18 1951-07-03 Remington Arms Co Inc Machine for assembling ammunition components, including resistance wire
US4483251A (en) * 1981-11-05 1984-11-20 Don Spalding Cartridge for small arms

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2559278A (en) * 1944-10-18 1951-07-03 Remington Arms Co Inc Machine for assembling ammunition components, including resistance wire
US2529863A (en) * 1948-10-30 1950-11-14 Goodrich Co B F Method and apparatus for making hard thermoplastic tube assemblies
US4483251A (en) * 1981-11-05 1984-11-20 Don Spalding Cartridge for small arms

Also Published As

Publication number Publication date
FR911257A (fr) 1946-07-03
BE459375A (xx)

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