US3203312A - Device for delaying the arming of combination automatic and semi-automatic fire-arms - Google Patents

Device for delaying the arming of combination automatic and semi-automatic fire-arms Download PDF

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Publication number
US3203312A
US3203312A US328857A US32885763A US3203312A US 3203312 A US3203312 A US 3203312A US 328857 A US328857 A US 328857A US 32885763 A US32885763 A US 32885763A US 3203312 A US3203312 A US 3203312A
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United States
Prior art keywords
operating rod
rod
movable section
section
travel
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
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US328857A
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English (en)
Inventor
Beretta Pier Giuseppe
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.)
Beretta SpA
Original Assignee
Fabbrica dArmi Pietro Beretta SpA
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Publication date
Application filed by Fabbrica dArmi Pietro Beretta SpA filed Critical Fabbrica dArmi Pietro Beretta SpA
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A19/00—Firing or trigger mechanisms; Cocking mechanisms
    • F41A19/03—Shot-velocity control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41A—FUNCTIONAL FEATURES OR DETAILS COMMON TO BOTH SMALLARMS AND ORDNANCE, e.g. CANNONS; MOUNTINGS FOR SMALLARMS OR ORDNANCE
    • F41A5/00—Mechanisms or systems operated by propellant charge energy for automatically opening the lock
    • F41A5/18—Mechanisms or systems operated by propellant charge energy for automatically opening the lock gas-operated

Definitions

  • FIGS. 1, 2 and 3 are fragmentary, longitudinal sectional views of a rifle operating rod and novel delay mechanism therefor made in accordance with one embodiment of the present invention, FIG. 1 showing the parts in the at-rest position; FIG. 2 illustrating what takes place upon firing; and FIG. 3 showing the parts after initiation of the return movement.
  • the arming rod of the Garand rifle (called the operating rod) consists of a tubular member inside which is housed a recovery spring.
  • the tubular operating rod is denoted at 1. It receives on the piston 2, that constitutes its integral front head, the pulse exerted by the gases derived from the gun-barrel when the gun is fired, then the gases of firing drive the rod rearwardly compressing the recovery spring 3, which at the opposed end abuts against the fixed block 5 of the breech, and transmits the pulse received, to the closing and firing mechanisms of the weapon by means of the arming car riage 4 mechanically connected thereto. Said mechanisms are not represented in the drawing because Wellknown.
  • Garand rifle is to be transformed from semiautomatic to automatic operation, the necessity has appeared, because of the great stresses that occur within the weapon, to modify the original arming device in order to obtain a greater regularity in the behaviour of the recovery spring in the course of the successive movements of compression and of expansion to which it is subjected, as well as to reduce the firing-rate of the weapon to the great advantage of its regularity of operation.
  • the novel device added by the present invention to the original Garand arming rod (operating rod) consists in a guide rod which is placed inside the recover spring 3, said rod comprising two telescoping sections (6 and 7) arranged coaxially, of which the front section 6 is slidable in the rear section 7, which has a (hollow) tubular crosssection.
  • the head or piston 8 of the front section 6 can contact the rear end or shank (rod) of the piston 2 that closes the front of the arming rod, while the rear section '7 seats against the fixed block 5 of the breech of the gun.
  • FIGURES 1, 2, 3 illustrate what has been described.
  • the head 3 with the respective section 6 constitutes an inertial mass proper.
  • the operation of the device is as follows: When the cartridge has been fired, the piston 2, having received the pulse of the gases derived from the barrel, imparts to the arming rod 1 a violent rearward motion, which compresses the spring 3 and moves the movable section 6 of the guide rod rearwardly into the tubular section '7, and effects stroke of the rod 1 towards the breech of the Weapon, thereby actuating the closing mechanism as well as the loading and firing mechanisms.
  • the rod 1 stops, according to the original Garand operating scheme, and the recovery spring 3, expanding again, then pushes the rod 1 forward into the position for starting a new cycle.
  • the return of rod 1 to its starting position is delayed, since the front section 6 of the spring-guide continues by inertia (in proportion to weight) its travel rearwardly inside the section 7, after the arming carriage 4 has actuated the loading and firing mechanisms and has been stopped together with rod 1, and compresses, thereby, further the recovery spring, while at the same time it disengages piston 8 from contact with the rear end of the piston 2.
  • FIG. 2 This situation is illustrated by FIG. 2 in which a-b is, demonstratively, the interval created between the piston 2 and the head 8 of the spring-guide section 6, when the latter is in its rearmost position.
  • the second delaying effect occurs when, on exhaustion of the rearward movement (by inertia) of the section 6, the recovery spring 3 pushes said section forward, and the head 8 of the section, after traversing the interspace a-b, again contacts the rear end of the piston 2 and pushes the assembly of the arming rod into the starting position for starting a new cycle.
  • FIGURE 3 represents this situation and the delay, in the cycle, corresponds to the infinitesimal time employed by the head of the spring-guide to traverse the interval a-b that separates it from the piston-rod.
  • the two above delaying effects are cumulative in operating cycle of the weapon, producing definitely the desired slowing-down of the firing-rate.
  • a cocking mechanism for a fire-arm that is operable selectively either automatically or semi-automatically, comprising (a) a reciprocable, tubular operating rod closed at its forward end and open at its rear end, and movable rearwardly by the gases created by firing the fire-arm,

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Toys (AREA)
US328857A 1962-12-13 1963-12-09 Device for delaying the arming of combination automatic and semi-automatic fire-arms Expired - Lifetime US3203312A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT2435262 1962-12-13

Publications (1)

Publication Number Publication Date
US3203312A true US3203312A (en) 1965-08-31

Family

ID=11213218

Family Applications (1)

Application Number Title Priority Date Filing Date
US328857A Expired - Lifetime US3203312A (en) 1962-12-13 1963-12-09 Device for delaying the arming of combination automatic and semi-automatic fire-arms

Country Status (4)

Country Link
US (1) US3203312A (en, 2012)
DE (1) DE1196549B (en, 2012)
DK (1) DK128754B (en, 2012)
NL (1) NL301235A (en, 2012)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103714A (en) * 1991-06-17 1992-04-14 Lafrance Timothy F Retro-fit gas system for controlling the firing rate of the Colt M16 automatic carbine

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451624A (en) * 1947-08-27 1948-10-19 Remington Arms Co Inc Inertia rate of fire retarders
US2834257A (en) * 1954-02-15 1958-05-13 John C Garand Inertia operated rate reducer for automatic firearms

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE450680A (en, 2012) * 1942-08-07
BE484530A (en, 2012) * 1947-09-26
US2981158A (en) * 1956-12-07 1961-04-25 David C Fletcher Power system for firearms

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2451624A (en) * 1947-08-27 1948-10-19 Remington Arms Co Inc Inertia rate of fire retarders
US2834257A (en) * 1954-02-15 1958-05-13 John C Garand Inertia operated rate reducer for automatic firearms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5103714A (en) * 1991-06-17 1992-04-14 Lafrance Timothy F Retro-fit gas system for controlling the firing rate of the Colt M16 automatic carbine

Also Published As

Publication number Publication date
DK128754B (da) 1974-06-24
NL301235A (en, 2012)
DE1196549B (de) 1965-07-08

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