patent US 3260009 Liberator Shotgun

patent US 3260009 Liberator Shotgun
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  July 12, 18966 R. L HILLBERG 3,260,009 MULTI-BARREL FIREARM WITH ROTATABLE AND RECIPROCABLE HAMMER Filed Dec. 23, 1964 5 Sheets-Sheet 1 r i \\ a ‘» \ ‘ \ \ w O I g BY EOBERT L./'//LLBE \ ?wmm ATTORNEY  3,260,009 uly 12, 1966 R. 1 HILLBERG MUL I‘I-BARREL FIREARM WITH ROTATABLE AND RECIPROCABLE HAMMER s Sheets-Sheet z iled Dec. 23,. 1964 INVENTOR. ROBERT . H/LLBERG “M m ATTORNEY  July 12, 1966 R. L. HILLBERG 3,260,009 MULTI-BARREL FIREARM WITH ROTATABLE AND RECIPROCABLE HAMMER Filed Dec. 25, 1964 5 Sheets-Sheet 5 INVENTOR. ROBERT L. H/LLBERG BYM/FW A TZ ORNEV  United States Patent 1 3,260,009 MULTI BARREL FIREARM WITH ROTATABLE AND RECIPROCABLE HAMMER Robert L. Hillberg, Cheshire, Conn., assignor to Olin Mathieson Corporation, a corporation of Virginia Filed Dec. 23, 1964, Ser. No. 420,562 3 Claims. (Cl. 42-69) This invention relates to a multi-barrel close range weapon with high killing potential. More speci?cally, this invention relates to a four barrel break-open ?rearm which has a minimum number of working parts, is simple to operate even by inexperienced personnel, and is economical to manufacture. The ?rearm of this invention is a four barrel weapon adapted for ?ring area type ammunition such as shot shells or the like. This type of ammunition compensates for the accuracy of inexperienced shooters, and the lack of time to take proper aim. A ?xed chamber aligned with each barrel accommo dates a round of ammunition. A queeze type trigger adapted to be pulled by four ?ngers is operative to cook and index a single rotating hammer housed in the rear of the ?rearm. The hammer consecutively actuates a ?ring pin aligned with each chamber to ?re the chamber. The ?ring mechanism s not dependent in any way on re coil or other forces for its operation. A is?re in any given chamber will therefore not effect the ?ring of the rest of the un?red rounds. A am on the hammer s operative to rotate the ham mer and cause a different chamber to be ?red each time the trigger is pulled. The ?rearm of this invention is compact, rugged, re liable, simple to operate and delivers high ?re power at close ranges. Because the ?ring mechanism is extremely simple and has very few moving parts, there is little chance for mal~ functions. The action cannot become jammed as in more conventional ?rearms. The design is rugged and simple so that the ?rearm can be re dily air dropped and used effectively by unskilled shooters with great effect. This invention will now be described in detail with reference to a preferred embodiment llustrated in the ap pended drawings in which: FIGURE is a top plan view of the ?rearm of this invention. FIGURE is a sectional side view of the ?rearm of this invention taken along the line 2—-2 of FIGURE . FIGURE is a side view partly sectioned showing the ?rearm f this invention broken open. FIGURE is a front view of the ?rearm of this inven tion. FIGURE is a sectional view taken along lines 5 5 in FIGURE . FIGURE is an end view of the rotary hammer used in the ?rearm of this invention. FIGURE is a side view of the hammer. FIGURE is a view showing the other end of the ham mer. Referring now to the drawings, the ?rearm comprises a front barrel housing 1 ‘and a rear trigger housing 2 joined together by pivot pin 3. The ?rearm is broken open for loading and unloading shells by pivoting about pin 3, as shown n FIGURE . A atch 4 pivotally attached to barrel housing 1 inter locks with lugs 5 on rear housing 2 to lock the ?rearm in the ?ring position shown in FIGURE . Latch 4 is pro vided with openings 6 which interlock with lugs 5. A spring 7 and plunger 8 act on latch 4 to bias the latch toward its locked position. The barrel housing 1 is provided with barrels, 9, 10, 11 10 15 20 25 30 50 55 60 65 70 3,260,009 Patented July 12, 1966 C€ 2 and 12 as seen in FIGURE . The barrels 9-12 may be formed integral with the housing 1, or may comprise in sel ts ?tted into the housing. Alternatively, the front housing may consist of four individual barrels fastened together by suitable means. A hamber is formed at the breech end of each barrel to accommodate a shotshell or the like. A rip 13 may be provided on barrel housing 1 to fa cilitate handling the ?rearm. The, grip 13 may be formed integral with the barrel housing or attached thereto by conventional means. Trigger housing 2 includes a piston grip portion 14 which may be formed integral with the housing or at tached thereto by conventional means. A reech plug 17 is mounted in rear housing 2. The breech plug has a hollow cylindrical rear portion 18 which accommodates a cylindrical rotating hammer 19. Mounted in the breech plug are a plurality of ?ring pins 16. A ring pin 16 is provided which is aligned with each of the chambers provided in front housing 1. Each ?ring pin is provided with a spring (not shown) urging the ?ring pin rearwardly away from the chamber. A snap ring or equivalent means is utilized to ‘hold each of the ?ring pins 16 in the breech plug. Hammer 19 includes a cylindrical body portion 20 and an enlarged rear shoulder 21. The body portion 20 is concentrically housed in the hollow rear portion 18 of the breech plug 17. A pring 22 extends between the inner end of the hammer 19 and a screw plug 23 which closes and rovides access to the interior of the rear hous ing 2. The spring 22 is guided by guide rod 24 formed integral with or attached to the breech plug 20 and ex tending rearwardly therefrom. The cylindrical hammer 19 is provided with a cam track 30 formed on the outer surface thereof as clearly seen in FIGURE . A in 31 (see FIG. 2) mounted in rear housing 2 engages the cam track and causes the hammer to rotate as it is moved rearwardly and released by the trigger means described below. A lurality of recesses 32, 33 and 34 (see FIG. 8-) are formed in the forward end of hammer 19. These recesses are aligned with {?ring pins mounted in the breech plug so that \those ?ring pins aligned with a recess are not engaged and ?red. Only the single ?ring pin aligned with ‘and en gaged by the portion of the hammer face which is not recessed will be actuated. A rigger 41 is pivotally mounted in grip portion 14 by means of a pivot pin 42. Spring means 43 urges the trigger in a counterclockwise direction about the pivot pin. A awl 45 is mounted in a recess 46 formed in the upper portion of the trigger. A spring 47 is mounted in recess 48 in the trigger and has portions 49 and 50 engaging a recess 51 formed n the pawl. In operation, the ?rearm is broken open as seen in FIGURE and shotshells are positioned in each of the flour chambers. The gun is closed and is ready to be ed. The rigger 41 is then squeezed. The trigger swings in an arc about pivot pin 42 carrying spring loaded pawl 45 on its upper surface. The pawl 45 engages shoulder 21 on hammer 19 and moves the hammer rearwardly. As the hammer moves rearwardly, it compresses hammer spring 22. As the pawl moves rearwardly in an arc, it releases the hammer which moves forward under spring force and strikes one of the ?ring pins 16. Since the :hammer s relieved at three sections 32, 33 and 34 on ts face, only one ?ring pin is engaged by the hammer. Pin 31 riding in cam track 30 on the hammer surface causes the hammer o rotate 90° during each fore and aft recipro cation. When he trigger 41 is released, it is returned to its nor mal ?ring position by spring 43 and pawl 45 is snapped
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