US2480017A

US2480017A - Bolt operating mechanism for repeating shotguns

Info

Publication number: US2480017A
Application number: US1092A
Authority: US
Inventors: Frank T Green
Original assignee: Savage Arms Corp
Current assignee: Savage Arms Corp
Priority date: 1948-01-08
Filing date: 1948-01-08
Publication date: 1949-08-23
Anticipated expiration: 1966-08-23

Description

Aug. 23, 1949. F. T. GREEN 2,480,017

BOLT OPERATING MECHANISM FOR REPEATING SHOTGUNS Filed Jan. 8, 1948 2 Sheets-Sheet l J0 I 10/ INVENTOR Eva/1x7." Gmrzw Y ATTOR EYS Aug. 23, 1949. F. T. GREEN 2,480,017

' BOLT OPERATING MECHANISM FOR REPEATING SHOTGUNS Filed Jan. 8, 1948 2 Sheets-Sheet 2 \INVENTOR ikA/wr I. GREEN ATTOR EYS Patented Aug. 23, 1949 BOLT OPERATING MECHANISM FOR REPEA'I'ING SHOTGUNS 1 Frank '1; Green. Chicopee Falls, Mass., assignor to. Savage Arms Corporation, Utica, N. Y., a

corporation of Delaware Application January 8, 1948, Serial No. 1,092

1 Claim.

This invention relates to improvements in .repeating shotguns and has for its object provision for a new construction of the bolt operating mechanism with a view to simplifying the same, providing a strong and durable structure to reduce costs.

A further object of the invention is to provide onsaid bolt mechanism for a magazine shell stop cooperating with other mechanism for convenience in manually loading shellsin the magazine tube and for positively retaining the tube supply of shells therein during operation of the gun. a

The full advantage of the invention will become apparent from the following and more detailed clescriptiontaken in connection with the accompanying drawings, in which.

Fig. 1 is a side view showing the action bar structure in forward position; V

Fig. 2 is a similar View with the casingbroken away to show the parts in forward position; i. e. with the action closed;

Fig. 3 is a view similar to Fig. 2 with various parts in section and with the action open;

Fig. 4 is a perspective to show structural details of the bolt slide construction; Fig. 5 is asection on line 5-5 of Fig. 4;

Fig. 6 is aside view with casing cut away to show the magazine loading operation;

Fig.7 is a bottom view of the receiver; and

Fig. 8 is a side view with parts cut away to show the shell lifter mechanism. 4

Referring more particularly to the drawings, the receiver I (Fig. 1) is provided with the usual ejection port 2 and an action' bar 3. The latter rides in a groove 4 cut in the inside surface of the receiver. It projectsforwardly from thereceiver and is formed with a handle 5 on a magazine tube 6 which is mounted below barrel I.

As shown, the action bar 3 is provided with a notch 8 for receiving a lug 9 of the bolt slide to be described and for reciprocating'the same in the receiver in operating the gun.

Lug 9 (Fig. 2) is an integral part of a bolt slide generally indicated by numeral ID. This slide is shown in perspective in Fig. 4. It is adapted to cooperate with a generally cylindrical bolt II and forms with it a two part bolt construction. On the underside of bolt II anintermediate' fiat portion I2 is out between the ends thereof. Portion I2 is stepped as at I3, the forward part thereof being provided with a longitudinal slot I4 giving-access to a notch I5 in a 1 firing pinv I6 set in a longitudinal bore of bolt 1 I.

Notch I5 receives an upstandingpost II ofslide I0 in a manner which prevents operation of the firing pin I6 unless the action of the gun is closed as will become apparent.

Slide I0 rides with the action bar 3 in groove 4 and on its opposite side in groove I8 (Figs. 2 and 3) in the opposite inside surface of receiver 1. A rectangular opening I9 in the rear portion of slide I0 provides, with a rear stud 20 of bolt II inserted in said opening I9, an interlock between the two parts whereby movement of the slide Ill carries the bolt with it in the receiver as will be apparent. It will be noted thatthe end of bolt II is chamfered and provides on the stud a camming surface 2| to cooperate with a complementary rear edge surface 22 of opening I9. When the bolt mechanism is carried from the position of Fig. 3 to that of Fig. 2 by the action bar, bolt II is brought forward by the stud 20 in opening I9 of slide I0. As the action is closed bolt I I is cammed upwardly at the rear thereof to be tilted into locking position. The

front face 23 of bolt II is machined at an angle to bring said face flush against the opening of the breech. Upward thrust of the bolt permits the slight further travel of slide I0 and carriage of post I! forwardly in slot I4 to free the firing pin I6 (Fig. 2).

On rearward travel to open the action a raised forward edge 24 of opening IS in slide I0 catches the forward edge of stud 20 to cam belt I I downwardly and carry the parts to their relative position when open as in Fig. 3.

Slide I0 at its rear edge is also provided with a centrally upturned cam 25 to ride a hammer 26 (pivoted on the trigger assembly frame as at 21) back to cocked position as movement of bar 3 opens the action.

Anaction lock lever 28, pivoted at 29 on the trigger assembly frame, cooperates with a finger 30 on the rear edge of slide I0 to lock the bolt I mechanism when in the looking or firing position of Fig. 2. As will be understood if it is not desired to fire the gun, pressure on finger piece 3i of lever 28 at the rear of the trigger guard carries the lever out of the path of finger 3i) and permits the action to be freely opened by manipulating bar 3. When the gun is fired, lever 28 is automatically carried out of the path of finger 30 by release of the hammer. The action of hammer 26 with relation to the lock lever 28 is as follows. When the hammer is being cocked a stud 32. thereon rides under an upwardly projecting latch 33 of the lever 28. The latch 33 holds the hammer from being released while the bolt is being carried forward in the receiver. At

the time the bolt is finally closed finger depresses lever 28 at its forward end causing the latch 33 to slip under stud 32 for the firing position as shown by Fig. 2. Lever 28 is held in this upward position, as shown, by a spring 34 anchored in a slot 35 in the forward part of lever 23. The spring is turned to lie pressed downwardly against a stud 35 fixed on the hammer 26 thus urging lever 28 upwardly. As trigger 31, pivoted at 38, releases the hammer 25 to fire the gun, spring 54 is released by the changed position of stud 55, said stud striking the hooked end of the spring 34 to release the pressure thereof and lower lever 28 and its upper end out of the path of finger 35. Thus the action may then be opened after firing by manipulating action bar 5.

The trigger mechanism as shown also includes a trigger spring 39, a safety button 40, and a hammer spring assembly 4! all as will be readily to tilt upwardly and be held in the position shown (Fig. 8) by a spring detent comprising a spring 55'and tooth 66. It will be understood this operation is for carrying a shell from the magazine tube and positioning it for carriage to the firing chamber after a previous shell has been fired and ejected by the opening of the action.

Bolt II is provided with the usual extractors 5i. An ejector 512, shown by Fig. 6, kicks the shells out of port 2.

The shell stop mechanism and operation in reloading the gun from the magazine will now be described. Mounted adjacent the opening of magazine tube 5 in the receiver is a cartridge stop 53 formed by a strap of spring metal and havin a release arm 54 disposed at right angles thereto in a recess 55. On the leading edge of slide I!) a cam surface 56 (see Fig. 4) is adapted to' press the arm 55 in recess 55 when the bolt is forward, thereby permitting a shell to be pressed from tube 6 by a magazine tube spring 5'5 (shown by Fig. 6).

It will be seen from consideration of Fig. 2 that a shell pressed past cartridge stop 53 is caught by a shell stop 58 mounted on the front underside of slide l0. Said stop 58 is pivotally mounted, on a bracket 59 as at 60 and is spring pressed outwardly thereof by a spring 6 I.

From consideration of Figs. 2 and 3 it will be noted that shell stop 58 is carried to the rear with slide it], the shell following stop 58 until pushed by the magazine spring against a shoulder 62 of the lifter. Shells remaining in tube 5 are held by cartridge stop 53. As the lifter on forward travel of the bolt tilts the shell (Fig. 8) the bolt H pushes said shell into the chamber. Shell stop 58 then kicks the lifter 45 downwardly to disengage spring 55 and tooth 65 to spring press the lifter to the position shown by Fig. 2. Cam surface 55 on slide I0 again depresses cartridge stop 53. The next shell in tube 6 then is pushed past cartridge stop 53 contacting shell stop 58 in readiness for the next cycle of operation.

In addition to the function described above, a further advantage of the shell stop 58 is in the provision for facilitating the initial loading of shells in magazine tube 6 or for the unloadin of the same from the tube 6. Both of these operations are accomplished when the action is closed as in Fig. 6. The operator when inserting a shell in loading presses the same against the lifter which pivots against the spring detent arrangement 65 and 66 previously described. Lifter 45 (Fig. '7) is provided with a forked end to lie astride stop 58. Stop 58 is retracted to afford a guided passage for the shells into the tube. As a shell is placed against the lifter it is fed into the tube and when manually released is caught by stop 58, the lifter returning to normal position 7 by pressure of spring 65.

In unloading the shells from the tube 6 finger or thumb pressure against the lifter 45 causes the shell stop 58 to be depressed out of the path of the shells, thus permitting the shells to be emptied from the tube by pressure of the tube spring. The cartridge stop 53 is inactive because the action is closed. It will be understood, furthermore, that the forked end of lifter 45 exerts a camming action in the unloading operation. The tips 61 being depressed under the rim of the shell, the inside surfaces of the forked portions tend to lift the shell outwardly of the receiver as the tube spring presses the same back along the lifter. Thus the simple action of pressing the lifter permits the ready emptying of shells from the tube.

It will be noted that with the arrangement of parts described the bolt structure with the slide I0 is extremely simple in character. Ver little machining is required to form the bolt H which may be produced from round bar stock. The slide maybe stamped from a rectangular piece or metal requiring but a few trimming cuts and the drilling 'of holes for attaching post I! and bracket 59. The other parts as well may be for the most part simply formed from stampings, thus reducing production costs and resulting in a new construction of operating mechanism.

What I claim is:

The combination of a two part bolt mechanism with a repeating shotgun of the type having a receiver to contain a bolt for reciprocation therein, a spring loaded magazine tube for storage of shells opening into the receiver, a cartridge stop in the receiver adjacent the outlet of said tube and adapted to retain shells therein, firing mechanism with .hammerand trigger mechanism, an action bar to reciprocate the bolt structure, and an action lock lever, said bolt mechanism comprising a generally cylindrical bolt member having a fiat portion on its underside between its ends and forming a depending stud at the rear .of the bolt, a slotted portion provided in the forward end of said fiat portion, a bore longitudinally of the bolt :and connecting centrally thereof with said slot, a firing pin mounted in the bore and having a recess on its underside accessible through said slot, and a one-piece bolt slide having alug at the side thereof engageable with said action bar,.an upstanding tapered post extending through said slotted portion of the bolt engageable with the firing pin recess to prevent operation thereof, an opening rearwardly of the slide to receive said depending rear bolt stud whereby on movement of the slide the bolt is carried in the receiver, the end of said stud being chamfered and said opening having a com-plementary rear edge for raising the end of said bolt upwardly in the receiver when the slide and bolt are moved forwardly, the forward edge of said opening having a raised surface to catch the forward end of said stud to cam the bolt downward onzrearwa-rd travel of the slide, a finger at the rear of the slide to engage with the action lock lever to lock the bolt when in firing position, a cam projection on the slide engaging the hammer on rearward travel of said slide to return said hammer to cocked position, a depending bracket at the forward end of the slide having a shell stop pivoted thereto with spring means to bias the shell stop outwardly of the bracket, and a cam surface at the forward end of the slide which, when the slide is forward, depresses said receiver cartridge stop and permits passage of a shell from the magazine tube past the cartridge stop for engagement by said shell stop. FRANK T. GREEN.

6 REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,648,831 Strickler Nov. 8, 1927 1,842,581 Browning Jan, 26, 1932 1,849,982 Howland Mar. 15, 1932 1,971,597 Browning Aug. 28, 1934 2,090,340 Browning Aug. 17, 1937 2,144,951 Williams Jan. 24, 1939