US2910918A - Gun recoil spring bearing on barrel and breech block - Google Patents

Gun recoil spring bearing on barrel and breech block Download PDF

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Publication number
US2910918A
US2910918A US433158A US43315854A US2910918A US 2910918 A US2910918 A US 2910918A US 433158 A US433158 A US 433158A US 43315854 A US43315854 A US 43315854A US 2910918 A US2910918 A US 2910918A
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United States
Prior art keywords
barrel
breech block
recoil spring
frame
spring bearing
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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
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US433158A
Inventor
John B Jewett
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SPORTARMS Manufacturing AND DEV CORP
SPORTARMS MANUFACTURING AND DEVELOPMENT Corp
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SPORTARMS Manufacturing AND DEV CORP
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Priority to US433158A priority Critical patent/US2910918A/en
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Publication of US2910918A publication Critical patent/US2910918A/en
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    • 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
    • F41A5/00Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/02Mechanisms or systems operated by propellant charge energy for automatically opening the lock recoil-operated
    • 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
    • F41A3/00Breech mechanisms, e.g. locks
    • F41A3/12Bolt action, i.e. the main breech opening movement being parallel to the barrel axis
    • F41A3/54Bolt locks of the unlocked type, i.e. being inertia operated
    • 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
    • F41A3/00Breech mechanisms, e.g. locks
    • F41A3/64Mounting of breech-blocks; Accessories for breech-blocks or breech-block mountings
    • F41A3/78Bolt buffer or recuperator means
    • F41A3/82Coil spring buffers
    • F41A3/86Coil spring buffers mounted under or above the barrel

Description

J. B. J EWETT Nov. 3, 1959 Filed May 28. 1954 mTu I ii. i! Em igmgx khan-l III- &
ll|l H 2 9 INVENTOR. JOHN BROWN JEWETT.
" %M 14 7" TOR/YE United States Patent GUN RECOIL SPRING BEARING ON BARREL AND BREECH BLOCK John B. Jewett, Newtown, Ohio, assignor to Sportarms ,Mnnufacturing and Development Corporation, New- 2 Claims. (Cl. 89 -196) This invention relates to improvements in firearms of the self-loading type, either semi-automatic or fullautomatic and particularly to the group having the so called blow back arrangement of breech mechanism in which the breech block retards the expulsion of a fired cartridge case from the chamber by its inertia and the load in a recoil or breech return spring or springs.
The object of my invention is to provide a firearm of extreme mechanical simplicity without a locked breech but which will be capable of firing powerful cartridges which usually necessitate a locked breech mechanism in which the breech block is locked to the barrel during the period of discharging a cartridge.
A further object is to provide a limited rearward movement of the barrel upon discharge of the cartridge.
A further object is to provide means for returning the barrel to normal position.
A further object is to provide a blow back autoloading firearm in which a minimum of risk is encountered by the shooter in firing faulty ammunition.
My invention will be further readily understood from the following description and claims, and from the drawings, in which latter:
Fig. l is a plan view of my improved firearm.
Fig. 2 is a side view of the same, partly in section.
Fig. 3 is an end view of the same.
Fig. 4 is a detailed perspective view of the end of the breech block, showing the extractors.
Fig. 5 is a detailed perspective view of the rear end of the barrel.
Fig. 6 is a detailed cross-section; taken in the plane of the line 6-6 of Fig. 2.
Fig. 7 is a diagrammatic view to show the principle of the invention.
My improved firearm comprises the usual frame 11 having a forward extending breech block guide 12 which is in the form of a U and engaging the lower portion 13 of the barrel 14 by means of inwardly extending lugs 15 received in grooves 16 in the lower portion 13 of the barrel.
The breech block 17 has extending side members 18 forming a forward journal 19 for the end of the barrel 14. This journal is tapered to permit easy disassembly of the barrel from the breech block.
The rear end of the barrel is provided with a cartridge chamber 20 having a chamfer 21 for easy feeding of the cartridges 22 into the chamber.
The lower portion 13 of the barrel is normally spaced from the frame by means of springs 23 received in apertures 24 in the frame and bearing against pins 25 which contact the lower portion of the barrel. The recoil spring 26 is mounted on a rod 27 which is threaded into the receiver and provided with a shoulder 28 to permit the barrel to be spaced from the frame. A washer 29 bearing against a shoulder 30 engages one end of 2 the recoil spring while the other end of the recoil spring bears against the forward journal 19 of the breech block.
Assuming that a cartridge is in the chamber of the barrel and the trigger 31 has been pulled, tripping the firing mechanism and discharging the cartridge causing the bullet to be upset in the rifling and start out the barrel. It will be noted that the means of retaining the barrel is the shoulder 28 which accepts the forward thrust of the upsetting bullet, and that the barrel return springs 23 positions the barrel against this shoulder and that the recoil spring has in turn positioned the breech block against the rear aspect of the barrel.
As the bullet travels out of the barrel, the cartridge case starts to move backward in the chamber. The chamber pressure rises to a point where the cartridge case grips the chamber walls to or nearly to the point of seizing. This occurs after the bullet has started out of the barrel and the upsetting force thereof is expended. At the same time the breech block has received a slight rearward acceleration and the friction of the cartridge case walls drag the barrel back against the load of the barrel return springs 23. While the rear face of the cartridge case is thrusting back against the inertia of the breech block, the load of the recoil spring is also assisting the backward movement of the barrel as it is stronger than the barrel return springs. Thus it will be seen that the breech block and barrel move backward together due to the drag of the cartridge case on the walls of the cartridge chamber during the period of peak chamber pressure until the barrel is finally arrested by the barrel meeting the frame. As the bullet has left or nearly left the barrel, the chamber pressure drops allowing the inertia of the breech block to continue withdrawal of the fired cartridge case from the chamber.
Feeding of another cartridge is accomplished by the forward movement of the breack block under the impulse of the loaded recoil springs as in conventional arrangements.
Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent is:
1. In an auto loading firearm, the combination of a frame, an unlocked barrel and breech block rearwardly movable under recoil relative to the frame, a recoil spring having a rear end movable with and pressing rearwardly against a forwardly disposed surface of said barrel and a fore end pressing forwardly against a rearwardly disposed surface of said breech block, said recoil spring reacting solely between said barrel and said breech block to establish closure of said breech block and barrel, and a return spring having a rear end pressing rearwardly against said frame and a fore end pressing forwardly against said barrel, said return spring reacting directly between said barrel and said frame to position said barrel, said breech block and said recoil spring at battery position.
2. In an autoloading firearm, the combination of a frame formed with a forwardly extending guide of generally U-shaped section, a breech block having a frontal ring portion and a rear block portion, a barrel slidably mounted within said ring portion and having grooves slidably complementary to said guide, said barrel and frame being formed with a first pair of opposing surfaces which are spaced when the barrel is in battery position but limit the rearward travel of the barrel on recoil, the barrel surface of said pair being provided by depending stop portion, a bolt projecting freely thru said depending stop portion and secured to said frame and formed with a shoulder for arresting forward moveguide portion forwardly and freely extending through the ring portion of said breech block, a barrel return spring between said first pair of opposing surfaces and having its rear end pressingagainst said frame and its front end pressing against said barrel, a washer secured solely to said barrel in front of said step portion and formed with an aperture to receive said spring guide'portion, and a recoil spring reacting solely between said frontal ring portion of the breech block and said washer, said recoil spring being spirally mounted on said spring guide portion so that the rear end of said recoil springis movable with said barrel and washer, said recoil spring ex erting a locking force between said barrel and said breech block and said return spring reacting directly between said barrel and said frame to position said barrel, said breech block and said recoil spring in battery position.
UNITED STATES PATENTS
US433158A 1954-05-28 1954-05-28 Gun recoil spring bearing on barrel and breech block Expired - Lifetime US2910918A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122061A (en) * 1962-05-17 1964-02-25 Maxwell G Atchisson Recoil spring guide and muzzle weight
US3207037A (en) * 1964-01-20 1965-09-21 Pachmayr Gun Works Pistol barrel mounting structure

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US935952A (en) * 1909-02-09 1909-10-05 Rudolf Becker Self-loading pistol.
US936967A (en) * 1909-10-12 William John Whiting Automatic small-arm.
US1143472A (en) * 1914-07-20 1915-06-15 William John Whiting Hammerless automatic small-arm.
FR477693A (en) * 1914-03-19 1915-11-04 William John Whiting Improvements to devices for attaching the barrel to automatic pistols
US1320578A (en) * 1919-11-04 Firearm
US1342705A (en) * 1919-05-27 1920-06-08 Erick E Anderson Wagon end-gate
US1846035A (en) * 1930-02-10 1932-02-23 Vickers Armstrongs Ltd Machine gun and automatic small arms
US2535156A (en) * 1948-04-08 1950-12-26 Colt S Mfg Company Semiautomatic firearm with trigger operated cocking mechanism
US2587937A (en) * 1948-04-30 1952-03-04 Jr Edwin H Waltke Barrel construction for firearms
US2664786A (en) * 1947-08-26 1954-01-05 Guisasola Bonifacio Slide and barrel securing key for automatic pistols
US2705847A (en) * 1951-09-24 1955-04-12 Lyle L Kramer Pistol, including improved operating mechanism
US2776602A (en) * 1953-09-25 1957-01-08 Colt S Mfg Co Barrel positioning means for automatic pistol

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US936967A (en) * 1909-10-12 William John Whiting Automatic small-arm.
US1320578A (en) * 1919-11-04 Firearm
US935952A (en) * 1909-02-09 1909-10-05 Rudolf Becker Self-loading pistol.
FR477693A (en) * 1914-03-19 1915-11-04 William John Whiting Improvements to devices for attaching the barrel to automatic pistols
US1143472A (en) * 1914-07-20 1915-06-15 William John Whiting Hammerless automatic small-arm.
US1342705A (en) * 1919-05-27 1920-06-08 Erick E Anderson Wagon end-gate
US1846035A (en) * 1930-02-10 1932-02-23 Vickers Armstrongs Ltd Machine gun and automatic small arms
US2664786A (en) * 1947-08-26 1954-01-05 Guisasola Bonifacio Slide and barrel securing key for automatic pistols
US2535156A (en) * 1948-04-08 1950-12-26 Colt S Mfg Company Semiautomatic firearm with trigger operated cocking mechanism
US2587937A (en) * 1948-04-30 1952-03-04 Jr Edwin H Waltke Barrel construction for firearms
US2705847A (en) * 1951-09-24 1955-04-12 Lyle L Kramer Pistol, including improved operating mechanism
US2776602A (en) * 1953-09-25 1957-01-08 Colt S Mfg Co Barrel positioning means for automatic pistol

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3122061A (en) * 1962-05-17 1964-02-25 Maxwell G Atchisson Recoil spring guide and muzzle weight
US3207037A (en) * 1964-01-20 1965-09-21 Pachmayr Gun Works Pistol barrel mounting structure

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