US3320887A - Combustible primer plug - Google Patents

Combustible primer plug Download PDF

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Publication number
US3320887A
US3320887A US477046A US47704665A US3320887A US 3320887 A US3320887 A US 3320887A US 477046 A US477046 A US 477046A US 47704665 A US47704665 A US 47704665A US 3320887 A US3320887 A US 3320887A
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United States
Prior art keywords
combustible
primer
pocket
plug
propellant
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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
US477046A
Inventor
Joseph B Quinlan
Jr John J Scanlon
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Individual
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Individual
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.)
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Publication date
Application filed by Individual filed Critical Individual
Priority to US477046A priority Critical patent/US3320887A/en
Priority claimed from GB3454966A external-priority patent/GB1150204A/en
Application granted granted Critical
Publication of US3320887A publication Critical patent/US3320887A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/085—Primers for caseless ammunition
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F42—AMMUNITION; BLASTING
    • F42C—AMMUNITION FUZES; ARMING OR SAFETY MEANS THEREFOR
    • F42C19/00—Details of fuzes
    • F42C19/08—Primers; Detonators
    • F42C19/10—Percussion caps
    • 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
    • Y10S102/00—Ammunition and explosives
    • Y10S102/70—Combustilbe cartridge

Definitions

  • a primer plug for use in the rearward portion of a round of caseless ammunition, having its primer mix and propellant disc protected from the heat of the firing pin, by a thermal seal.
  • the invention relates to a combustible primer plug for caseless ammunition and more particularly to a combustible primer for caseless ammunition having a thermal seal.
  • primer plugs have contained a primer mix and a propellant seal. This construction has proved operational when the caseless cartridge has been used in single-shot firings. But, when used in a machine gun, during automatic firing in long burst, the firing pin reached a temperature so high that the heat from said firing pin ignited the cartridge before it was properly seated in the chamber thereby causing malfunctioning of the machine gun.
  • the invention solves this problem by providing a mica thermal seal along with the propellant disc and primer mix in a primer plugv This mica thermal seal prevents the heat from a hot firing pin from pre-igniting the primer.
  • Another object of the invention is the provision of a caseless cartridge that can be successfully fired from an automatic gun in long burst.
  • a primer plug is indicated generally by reference numeral 10.
  • Said primer plug is made from molded propellant and fits in the rear portion "ice of a molded caseless cartridge (not shown).
  • Said primer plug 10 has a pocket 12, located in the rearward portion thereof, which contains a primer mix 14.
  • the function of the primer mix 14 is to initiate the combustible plug 10 and then the caseless cartridge (not shown).
  • a propellant disc seal 16 is placed on top of said primer mix 14 to hold it in place and to provide a combustible material that will completely burn.
  • a mica thermal seal 18 is then secured on top of the propellant disc seal 16 thereby protecting same from a hot firing pin tip (not shown) during automatic firing in long burst. It has been found that, in a caseless machine gun, a burst greater than sixteen rounds cannot be obtained without a mica thermal seal.
  • a combustible primer plug for caseless ammunition comprising a molded propellant, a pocket in said molded propellant, a primer mix secured in said pocket for initiating said molded propellant, a combustible means for holding said primer mix in said pocket, and a thermal seal secured on top of said combustible means.
  • a combustible primer plug for caseless ammunition comprising a molded propellant, a pocket in said molded propellant, a primer mix secured in said pocket for initiating said molded propellant, a combustible means for holding said primer mix in said pocket, and a mica thermal seal secured on top of said combustible means.
  • a combustible primer plug for caseless ammunition comprising a molded propellant, a pocket in said molded propellant, a primer mix secured in said pocket for initiating said molded propellant, a combustible disc seal for holding said primer mix in said pocket, and a mica thermal seal secured on top of said combustible disc seal.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Paints Or Removers (AREA)

Description

y 1967 J. B. QUINLAN ET AL 3,320,887
COMBUSTIBLE PR IMER PLUG Filed Aug. 5, 1965 JOSEPH B. QUINLAN JOHN J. SCANLON JR,
United Sttes ABSTRACT OF THE DISCLOSURE A primer plug, for use in the rearward portion of a round of caseless ammunition, having its primer mix and propellant disc protected from the heat of the firing pin, by a thermal seal.
The invention described herein may be manufactured and used by or for the Government for governmental purposes without the payment to us of any royalty thereon.
The invention relates to a combustible primer plug for caseless ammunition and more particularly to a combustible primer for caseless ammunition having a thermal seal.
In the past, primer plugs have contained a primer mix and a propellant seal. This construction has proved operational when the caseless cartridge has been used in single-shot firings. But, when used in a machine gun, during automatic firing in long burst, the firing pin reached a temperature so high that the heat from said firing pin ignited the cartridge before it was properly seated in the chamber thereby causing malfunctioning of the machine gun.
The invention solves this problem by providing a mica thermal seal along with the propellant disc and primer mix in a primer plugv This mica thermal seal prevents the heat from a hot firing pin from pre-igniting the primer.
It is therefore an object of the invention to provide a primer plug that will not be pre-ignited by a hot firing pin.
Another object of the invention is the provision of a caseless cartridge that can be successfully fired from an automatic gun in long burst.
The above objects as well as others together with the benefits and advantages of the invention will be apparent upon reference to the detailed description set forth below, particularly when taken in conjunction with the drawing annexed hereto in which a primer plug is indicated generally by reference numeral 10. Said primer plug is made from molded propellant and fits in the rear portion "ice of a molded caseless cartridge (not shown). Said primer plug 10 has a pocket 12, located in the rearward portion thereof, which contains a primer mix 14. The function of the primer mix 14 is to initiate the combustible plug 10 and then the caseless cartridge (not shown). After the primer mix 14 is inserted in the pocket 12, a propellant disc seal 16 is placed on top of said primer mix 14 to hold it in place and to provide a combustible material that will completely burn. A mica thermal seal 18 is then secured on top of the propellant disc seal 16 thereby protecting same from a hot firing pin tip (not shown) during automatic firing in long burst. It has been found that, in a caseless machine gun, a burst greater than sixteen rounds cannot be obtained without a mica thermal seal.
Obviously many modifications and variations of the present invention are possible in the light of the above teachings. It is therefore to be understood, that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described.
We claim:
1. A combustible primer plug for caseless ammunition comprising a molded propellant, a pocket in said molded propellant, a primer mix secured in said pocket for initiating said molded propellant, a combustible means for holding said primer mix in said pocket, and a thermal seal secured on top of said combustible means.
2. A combustible primer plug for caseless ammunition comprising a molded propellant, a pocket in said molded propellant, a primer mix secured in said pocket for initiating said molded propellant, a combustible means for holding said primer mix in said pocket, and a mica thermal seal secured on top of said combustible means.
3. A combustible primer plug for caseless ammunition comprising a molded propellant, a pocket in said molded propellant, a primer mix secured in said pocket for initiating said molded propellant, a combustible disc seal for holding said primer mix in said pocket, and a mica thermal seal secured on top of said combustible disc seal.
Materials in Design Engineering, vol. 60, N0. 5, October 1964, p. 339.
SAMUEL FEINBERG, Primal Examiner.
ROBERT F. STAHL, Examiner.

Claims (1)

1. A COMBUSTIBLE PRIMER PLUG FOR CASELESS AMMUNITION COMPRISING A MOLDED PROPELLANT, A POCKET IN SAID MOLDED PROPELLANT, A PRIMER MIX SECURED IN SAID POCKET FOR INITIATING SAID MOLDED PROPELLANT, A COMBUSTIBLE MEANS FOR HOLDING SAID PRIMER MIX IN SAID POCKET, AND A THERMAL SEAL SECURED ON TOP OF SAID COMBUSTIBLE MEANS.
US477046A 1965-08-03 1965-08-03 Combustible primer plug Expired - Lifetime US3320887A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US477046A US3320887A (en) 1965-08-03 1965-08-03 Combustible primer plug

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US477046A US3320887A (en) 1965-08-03 1965-08-03 Combustible primer plug
GB3454966A GB1150204A (en) 1966-08-02 1966-08-02 Improvements in Primers for Caseless Small Arms Ammunition.

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US3320887A true US3320887A (en) 1967-05-23

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463086A (en) * 1967-11-06 1969-08-26 Olin Mathieson Caseless smokeless powder pellet and method of preparing same
US3504629A (en) * 1967-12-28 1970-04-07 Hercules Inc Primer for use with caseless ammunition
US3645207A (en) * 1969-05-06 1972-02-29 Trw Inc Combustible moistureproof percussion primer
US3771454A (en) * 1972-09-28 1973-11-13 Us Army Primer
US3807309A (en) * 1968-10-08 1974-04-30 Us Army Ballistic primer
FR2284854A1 (en) * 1974-09-13 1976-04-09 Bofors Ab METHOD AND DEVICE FOR FAST AND TOTAL IGNITION OF A PYROTECHNIC CHARGE

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187671A (en) * 1962-08-01 1965-06-08 Quinlan Joseph Primer for consumable round

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3187671A (en) * 1962-08-01 1965-06-08 Quinlan Joseph Primer for consumable round

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463086A (en) * 1967-11-06 1969-08-26 Olin Mathieson Caseless smokeless powder pellet and method of preparing same
US3504629A (en) * 1967-12-28 1970-04-07 Hercules Inc Primer for use with caseless ammunition
US3807309A (en) * 1968-10-08 1974-04-30 Us Army Ballistic primer
US3645207A (en) * 1969-05-06 1972-02-29 Trw Inc Combustible moistureproof percussion primer
US3771454A (en) * 1972-09-28 1973-11-13 Us Army Primer
FR2284854A1 (en) * 1974-09-13 1976-04-09 Bofors Ab METHOD AND DEVICE FOR FAST AND TOTAL IGNITION OF A PYROTECHNIC CHARGE

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