Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS3246567 A
Publication typeGrant
Publication dateApr 19, 1966
Filing dateJun 15, 1964
Priority dateJun 15, 1964
Also published asDE1453904A1
Publication numberUS 3246567 A, US 3246567A, US-A-3246567, US3246567 A, US3246567A
InventorsArthur Miller
Original AssigneeArmalite Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Operating rod for self-loading firearm
US 3246567 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

April 19, 1966 A. MILLER 3,246,567

OPERATING ROD FOR SELF-LOADING FIREARM Filed June 15, 1964 United States Patent 3,246,567 OPERATING ROD FOR SELF-LOADING FIREARM Arthur Miller, Costa Mesa, Calif., assignor to Armaiite, Inc., Costa Mesa, Calif., a corporation of California Filed June 15, 1964, Ser. No. 375,256 Claims. (Cl. 89-191) This invention relates to an improvement in the conventional gas-actuated push rod system for a self-loading firearm, more particularly, to a push rod system particularly adapted to a lightweight, self-loading firearm of the rapid fire type.

In the conventional gas-actuated push rod system for a self-loading firearm, the gas is bled from a port in the barrel into a piston and cylinder arrangement.

It is preferred in the interest of less weight to locate the gas port on the barrel nearer the muzzle where the gas pressure is less and the unlocking and reloading can be effected with less massive mechanism than is required for storing the kinetic energy to effect reloading with a short-coupled gas system. However, a long and relatively rigid push rod is required in such a system. The rigid push rod is attached to the piston cylinder arrangement on one end and the other end is attached to the receiver mechanism in a manner to actuate the selfloading mechanism. It is spring-biased for the return stroke.

If the push rod is of reduced diameter to eliminate weight, it will bend or whip by reason of the rapid action of the firearm and in the conventional system, introduces binding or galling in the piston and cylinder assembly. The binding or galling of the piston and cylinder will cause malfunction or greatly reduce the effectiveness of the system.

In the present invention, the push rod can be of greatly reduced diameter from the conventional push rod and designed to bend freely within the elastic limits of the material without impairing the function of the weapon and thus effecting a considerable reduction in the weight of the push rod. This is accomplished by the mounting of the push rod on the piston assembly as hereinafter described.

It is an object of this invention to provide a lightweight push rod for a gas-actuated push rod system through the reduction of the diameter of the push rod which can bend freely in operation Without impairing the operation of the system or causing malfunction of the system.

It is another object of this invention to provide a mounting for a push rod for gas-actuated push rod system for a self-loading firearm that will bend freely without transmitting the bending of the push rod to the piston cylinder assembly.

Further and other objects of this invention will become apparent from the description of the accompanying drawings in which like numerals refer to like parts.

In the drawings:

FIG. 1 is a fragmentary view of a rapid self-loading firearm gas-actuated push rod system;

FIG. 2 is a fragmentary view of the forward end of the barrel of the system, showing the push rod assembly in the operating position;

FIGS. 3 and 4 are views of an alternate arrangement of the push rod piston cylinder assembly on a rifle barrel.

FIGURE 1 of the drawing shows a rifle barrel 1 secured to a receiver 2. Block 3 represents a portion of the self-loading system which is actuated by push rod 4. Push rod 4 extends into the receiver 2 and moves block 3, as the rifle is fired, for reloading.

On the forward end of barrel 1, gas is bled off at port 5 in the barrel and through passage 6. Piston 7 has passage 8 formed therein and it is threaded at 9 into bracket 10 which is rigidly secured to barrel 1. A cylinder 11 surrounds piston 7 and moves rearwardly of the barrel with each firing.

The forward end of push rod 4 is formed with a spherical surface engaging a similar spherical surface on cylinder 11. The forward end of push rod 4 and the rearward end of cylinder 11 have inter-engaging means, such as pin 13 loosely fitting in hole 14, to provide freedom of movement of push rod 4 with respect to cylinder 11 at surface 12. Spring 15 biases push rod 4 against cylinder 11 throughout the operation of the system.

When the rifle is fired and the bullet passes port 5, a small quantity of gas under high pressure is bled off through passages 6 and 8 and causes cylinder 11 to move rearwardly of the barrel of the rifie. The motion of cylinder 11 is transmitted to push rod 4, and in turn, to bolt unlocking and reloading mechanism represented at 3.

If rapid fire causes push rod 4 to bend or whip, the forward end will merely move with respect to cylinder 11 on spherical surface 12, and no bending or stress will occur between cylinder 11 and piston 7 that will tend to gall and produce malfunction.

As shown in FIG. 2, relative motion of piston 7 and cylinder 11 will be coaxial.

FIGS. 3 and 4 show the same result with a lightweight push rod, but with the connection of the piston and cylinder reversed. Piston 7' has formed on its rearward end, spherical surface 12 and projection 13. Cylinder 111 is threaded to engage bracket 10. The remainder of the parts function in the manner described in connection with FIGS. 1 and 2.

A long, lightweight push rod is thus achieved which will operate reliably over a long period of time and achieve the overall feature of saving in weight in the self-loading system including the unlocking and reloading mechanism.

It is to be undertsood that certain changes, alternations, modifications and substitutions can be made without departing from the spirit and scope of the appended claims.

What is claimed is:

1. A lightweight push rod system for a self-loading firearm comprising a barrel, a gas port formed therein near the muzzle end of said barrel, a piston and cylinder assembly secured to said barrel, means forming a passage to interconnect said piston and cylinder assembly and said gas port to conduct gas from said barrel to actuate said piston and cylinder assembly, said piston and cylinder assembly formed with a spherical end surface perpendicular to the axis of said assembly, a push rod interconnecting said piston and cylinder assembly and the self-loading mechanism of the firearm, said push rod having the end adjacent said piston and cylinder assembly formed with a mating spherical surface, loosely coupled locator means positioning said spherical end of said push rod on said spherical end of said piston and cylinder assembly and biasing means to hold said spherical surfaces in contact and to permit relative motion of said push rod along said barrel, but out of axial alignment with said piston and cylinder assembly, said locator means comprising an elongated pin on one of said spherical surfaces, loosely engaging a longer hole formed in the other of said spherical surfaces.

2. The device as set forth in claim 1, in which said means forming a passage interconnecting said piston and cylinder assembly and said gas port is a bracket firmly secured to said barrel, said piston and cylinder assembly being mounted on said bracket.

.3. The device as set forth in claim 1, in which said bracket is a front sight bracket.

3 4. The device as set forth in claim 1, in which the pis- References Cited by the Examiner ton of said piston and cylinder assembly is mounted on UNITED STATES PATENTS said bracket with the axis thereof extending generally aranel to the axis of said barrel 564,043 7/1896 Benet et al 89-191 X P 5 Th d f h 1 h h 5 1,524,974 2/1925 Hazelton s9 193 e evlce as Set on In C alnl 1 W t 5 3 0 9 97 1 2 Stevens 89-191 cylinder of said piston and cylinder assembly is mounted Y I on said bracket with the axis thereof extending generally BENJAMIN BORCFIELT Exammer' parallel to the axis of said barrel. FRED C. MATTERN, In, Examiner.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US564043 *Feb 26, 1896Jul 14, 1896 benfit
US1524974 *Apr 21, 1924Feb 3, 1925George HazeltonGas chamber for automatic guns
US3069976 *Dec 6, 1957Dec 25, 1962Stevens Jr Frederick FGas-operated semiautomatic pistol
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3568564 *Sep 30, 1968Mar 9, 1971Olin CorpShotgun short stroke gas system
US3596555 *May 5, 1969Aug 3, 1971Trw IncFiring chamber seal
US3707110 *Mar 10, 1970Dec 26, 1972Remington Arms Co IncAccelerating gas system for gas-operated firearms
US4207798 *Nov 10, 1977Jun 17, 1980Kabushiki Kaisha Kawaguchiya Hayashi Juho Kayaku-TenGas operating system for loading shot shell in an automatic gun
US4765224 *Aug 15, 1986Aug 23, 1988Morris Michael CAutomatic rifle gas system
US4977815 *May 5, 1989Dec 18, 1990Stephens Mark LSelf cleaning automatic machine pistol and silencer for the same
US5831202 *Mar 21, 1997Nov 3, 1998Rustick; Joseph M.Muzzle attachment for barrel of gas-operated weapon
US6634274Dec 11, 2000Oct 21, 2003Geoffrey Andrew HerringFirearm upper receiver assembly with ammunition belt feeding capability
US6681677Nov 21, 2002Jan 27, 2004Geoffrey A. HerringMethod of reconfiguring a firearm receiver system for receiving magazine-fed ammunition and belt-fed ammunition
US6722255 *Nov 21, 2002Apr 20, 2004Geoffrey A. HerringApparatus and method for actuating a bolt carrier group of a receiver assembly
US6848351 *May 7, 2002Feb 1, 2005Robert B. DaviesRifle
US7469624Nov 12, 2007Dec 30, 2008Jason AdamsDirect drive retrofit for rifles
US7739939 *Jul 17, 2008Jun 22, 2010Adams Arms, Inc.Direct drive retrofit for rifles
US7779743Jan 30, 2007Aug 24, 2010Herring Geoffrey AGas piston assembly and bolt carrier for gas-operated firearms
US7827722 *Jun 16, 2006Nov 9, 2010Davies Robert BRifle
US7874240Jun 25, 2007Jan 25, 2011Brian AkhavanFirearm operating mechanisms and methods
US8161864Mar 24, 2009Apr 24, 2012Sturm, Ruger & Company, Inc.Firearm gas piston operating system
US8307750May 12, 2010Nov 13, 2012Sturm, Ruger & Company, IncGas operated rifle with bolt carrier and receiver assembly
US8443711Jan 26, 2010May 21, 2013Leitner-Wise Defense, Inc.Gas operating systems, subsystems, components and processes
US8505433Feb 17, 2012Aug 13, 2013Colt Defense, LlcFirearm with gas operating system
US8528458Jul 27, 2011Sep 10, 2013Bernard T. WindauerPressure-regulating gas block
US8640598Jul 16, 2011Feb 4, 2014Jason Stewart JacksonSleeve piston for actuating a firearm bolt carrier
US8783160Aug 12, 2013Jul 22, 2014Colt's Manufacturing Company LlcFirearm with gas operating system
US8943948May 3, 2011Feb 3, 2015Colt's Manufacturing Company LlcFirearm having an indirect gas operating system
US20120085226 *Aug 23, 2011Apr 12, 2012Bradhart Products, Inc.Gas Piston System Actuator Assembly for Rifle Automatic Ejection and Reload
US20120152104 *Sep 14, 2009Jun 21, 2012Colt Defense LlcFirearm having a hybrid indirect gas operating system
EP1797389A2 *Sep 19, 2005Jun 20, 2007Colt Defense, LLCFirearm having an indirect gas operating system
EP1984689A2 *Feb 7, 2007Oct 29, 2008Colt Defense LLCLaw enforcement carbine with one piece receiver
EP2141437A2 *Jul 1, 2009Jan 6, 2010Adcor Industries, Inc.Firearm having an indirect gas impingement system
WO2012034711A1 *Sep 19, 2011Mar 22, 2012Michael KleszAutomatic firearm
U.S. Classification89/191.2, 89/191.1
International ClassificationF41A5/26, F41A5/18, F41A5/00
Cooperative ClassificationF41A5/26, F41A5/18
European ClassificationF41A5/26, F41A5/18