US3021634A

US3021634A - Firearms extractor-ejector assembly

Info

Publication number: US3021634A
Application number: US22156A
Authority: US
Inventors: James H Johnson
Original assignee: Olin Corp
Current assignee: Olin Corp
Priority date: 1960-04-14
Filing date: 1960-04-14
Publication date: 1962-02-20
Anticipated expiration: 1979-02-20

Description

Feb. 20, 1962 J. H. JOHNSON FIREARMS EXTRACTOR-EJECTOR ASSEMBLY Filed April 14, 1960 INVENTOR. JAMES H. JOHNSON United States Pate 3,021,634 Patented Feb. 20,1962

fiice 3,021,634 FIREARMS EXTRACTOR-EJECTOR ASSEMBLY James H. Johnson, New Haven, Conn., assignor to Olin Mathieson Chemical Corporation, a corporation of Virginia 7 Filed Apr. 14, 1960, Ser. No. 22,156 1 Claim. (Cl. 4225) energizin'g the extractor and the ejector jointly.

An additional feature of the present invention is the provision of a hollow bolt body carrying a movable ejector pin and a claw-type extractor where both the ejector and extractor are retained within the hollow bolt body by a single coil spring means where the spring is also useful to power the extractor and the ejector Without the use of intermediate instrumentalities.

Firearms embracing certain features of the present invention may comprise a hollow bolt, a receiver connected to a barrel formed with a chamber for receiving a cartridge, said bolt being movable axially within the receiver and having a head adapted to abut a cartridge disposed in the chamber when the bolt is in a closed position, an ejector pin slidably received in a bore formed in the bolt face and movable into contact with the cartridge, said bolt being further formed with an aperture operative to receive an extractor element generally defining a bell crank and terminating at one end in a claw operable to engage the rim of a cartridge and terminating at the opposite end in a knife edge operative to bear upon the bolt head, and a spring means disposed within the bolt and maintained under compressive stress so as to drive the ejector element into contact with the cartridge and to urge the extractor to rotate about said knife edge thereby driving the claw into firm contact with the cartridge.

Other features and advantages of the present invention will become more apparent from the succeeding specification when read in conjunction with the appended drawings in which:

'FIG. 1 is a vertical section of a portion of a firearm disclosing an illustrative embodiment of the ejector-extractor assembly, and,

FIG. 2 is a view similar to FIG. 1 showing the bolt in which a cartridge 13- having a rim 14 is disposed.

A hollow, axially reciprocable bolt 16, shown in the normal or closed position in FIG. 1 and in the open or actuated position of FIG. 2, is formed with a bore 17 terminating at the right end in a bolt head 18. In well known fashion the bolt head is formed with a recess or counterbore defining a bolt face 19 operative to engage and make a real contact with a corresponding plane surface 21 formed on the rear of the cartridge 13.

The bolt 16 is formed with an aperture 22 to receive an ejector element comprising a pin 23 and a lug 24.

In a generally diametn'c position the bolt 16 is formed with an aperture or a cut-out indicated by the reference 7 numeral 26 receiving an extractor element generally de- In particular, the extractor element comprises arm 29 terminating in a claw 28 operative to engage the rim 14 of cartridge 13 in well known fashion. The element includes a second arm 31 disposed generally perpendicular to the element 29 formed with a knife edge 32 operative to bear upon and pivot about an internal surface of the bolt head identified by the reference numeral 33. The bore 17 of the hollow bolt 16 carries a coil spring 34 maintained under compressive stress wherein one end of the spring engages a pin 36 carried by the bolt while the opposite end contacts lug 24 formed on the ejector element and recess or groove 37 formed in the arm 31 of the extractor element.

Because of the compressive stress of the spring 34 a constant force is applied to the ejector and extractor elements tending to drive these elements in the following fashion. v

The last coil 38 of the spring engages the lug 24 and is operative to urge the ejector 23 to the right from the position of FIG. 1 to the position shown in FIG. 2 effective to develop acouple about claw 28 to eject a spent cartridge through ejection port 39.

The same coil 38 engages the extractor element at the recess 37 and is thus operative to drive the main body of the extractor in a counterclockwise direction as viewed in FIG. 1 about the knife edge 32. This operation of the spring 34 and the extractor 29' insures firm engagement of the claw 28 with the rim '14 of the cartridge 13 operative to haul a spent cartridge out of the chamber 12 in conventional fashion. 7

Although the extractor element is constantly urged in a counterclockwise direction about the knife 32, the resilience of the spring 34 powering the extractor is sulficient to permit the claw 28 to snap around the rim of a newly chambered cartridge as the bolt is pushed from an open position to a closed position. The chamfered nose 41 of the claw encounters a corresponding chamfer formed on the rim of the cartridge and a camming action occurs in well known fashion to permit the claw to swing outwardly in a clockwise direction as viewed in FIG. 1, against the torque developed by the spring 34 a sufficient distance to permit the claw to clear the rim 14 and thereafter snap into the groove 42 to the position shown in FIG. 1. I

It is anticipated that a wide variety of embodiments of the disclosed ejector-extractor assembly may be devised without departing from the spirit and scope of the invention. 7

What is claimed is:

An ejector-extractor assembly comprising a bolt having a bore, an ejector pin slidably mounted with the bore, an extractor pivotally mounted upon the bolt and a single means for driving the ejector and the extractor comprising a coil spring having a plurality of turns, said coil spring being retained under compression in the bore with the foremost turn thereof being in driving engagement with both the ejector pin and the extractor, said single turn being operative to drive the ejector pin axially and being operative to rotate the extractor aboutan axis generally perpendicular to the axial path along which the ejector is driven.

References Cited in the file of this patent UNITED STATES PATENTS 495,137 Krnka Apr. 11, 1893 1,140,245 Bubar May 18, 1915 1,790,320 Reising Jan. 27, 1931