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Publication numberUS557079 A
Publication typeGrant
Publication dateMar 24, 1896
Publication numberUS 557079 A, US 557079A, US-A-557079, US557079 A, US557079A
InventorsManuel Mondragon
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 557079 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.) 3 Sheets-Sheet l.



No. 557,079. Petenlted Mer.. 24, 1896.

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Patented Mar. 24, 1896.

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MMONDRAGON. ,BREBGH LOADING BOLT GUN. No. 557,079. Patented Mar. 24, 1896.


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'SPECIFICATION forming part of Letters Patent No. 557,079, dated March 24, 1896.

' Application filed February 8,1893. Serial No. l161,476. (No model.) Patented in Belgium March 23, 1892, No. 98,947, and in France April 20, 1892, No. 221,035.

To all whom t may concern:

Be it known that I, MANUEL MoNDRAGoN, a citizen of the Republic of Mexico, and a.resident of Mexico, (Palacio Nacionah) in the Republic of Mexico, have invented certain new and useful Improvements in Breech-Loading Firearms, (for which I have obtained Letters Patent in Belgium, No. 98, 947, dated March 23, 1892, and in France, No. 221,035, dated April 20, 1892,) of which the following is a specification.

This invention relates to improvements in breech-loading firearms in which the breech is opened and closed by moving the breechbolt forward and backward in line of the axis of the barrel.

The invention consists in thecombination with a breech-casing of aguide-bar on which the slide is mounted that is provided with a projecting pin passing into a spiral or inclined groove of the breech-bolt. The slide transmits to the breech-bolt a reciprocating movement and during the course of said movement turns the breech-bolt axially, so as to permit a latch on the slide to pass into an aperture on the breech-bolt, so that the breech-bolt after having been turned moves only in the direction of its length. A plate having a tapering end and secured on the breech-casing serves for the purpose of automatically disengaging the latch 'when the breech-bolt is to be turned axially. The breech-bolt is provided with a series of ribs, and two corresponding series of ribs are provided on the breech-casing, which ribs have beveled ends, so that when the breech-bolt is turned axially it is locked doubly secure.

The invention further consists in the attachment of means by which the gun can be fired automatically-` In the accompanying drawings, Figure 1 is a side view of my improved breech-loading firearm, parts being in section and the breech closed by the bolt. Fig. 2 is a plan view of the same, parts being broken out. Fig. 3 is a vertical transverse sectional view on line 3 3 of Fig. 1. Fig. 4 is a vertical transverse section on line 4 4 of Fig. 1. Fig. 5 is a vertical longitudinal sectional view of the breech of the iirearm, showing the breech-bolt being removed and the trigger being locked for automatic firing. Fig. G is a side view of the breech part of the firearm, showing the breechbolt and latch after the first part of the movement toward the rear; and Fig. 7 is a sectional plan view on the line 7 7 of Fig. 5. Fig. 84is a plan-view of the means for moving forward the breech-bolt, parts being broken ont.

Similar letters of' reference indicate corresponding parts.

The breech-bolt l) of the gun is provided at the front and near the rear end with two rows of short longitudinal ribs 1)112, separated circumferentially a short distance from each other, as shown in Figs. 1, 2 and 6, and the breech-casing a of the gun is provided with two sets of correspondingly-longitudinal short ribs a' a2 on the inner surface, which ribs are separated circumferentially from each other a distance equal to the width of the ribs b/ b2, as shown on Fig. 5. The two sets of ribs on the breech-bolt and breech-casing are so arranged that when the breech-bolt b is inserted into the breech-casing a the bolt must be turned in order to permit the ribs b b2 to pass through the grooves between the ribs a a2.

. The breech-casing has at one side a guidebar c, Figs. 1 and 3, upon which the slide d, provided with a head or handle CZ', can move in the direction of the length of the barrel. The slide d is provided with a projecting pin do, Figs. 1 and (5, that passes into an inclined or spiral groove bo, Figs. 1, 2 and G, of the breech-bolt b.

During the forward and backward movements of the slide d on the guide-bar c the breech-bolt is moved in the direction of the length of the axis of the barrel in the breechcasing, but in such a manner that at the beginning of the movement toward the rear, and likewise at the end of the movement toward the front, said breech-bolt is turned by the action of the pin d0 on the edges of the groove bo. The bolt is turned axially and by this movement causes the breech-bolt to close absolutely tight, as the ribs bl and a 01,2 have their ends beveled, and by the action on each other of the beveled ends of said ribs the breech-bolt is forced to the front.


Upon the beginning of the opening movement of the bolt, said bolt is iirst turned axially to unlock the same, and at the same time the cartridge,which is gripped by the well-known extractor-jaws, (not shown in this case,) is loosened. In order that the axial movement of the breech-bolt should begin and cease at the proper time, an adjusting device is provided, which'consists of the latch e, Figs. 2, 3, and 8, which is provided with a pin that passes into an aperture in the knob d of the slide and is pressed by a spring e0 toward the axis of the barrel and breech, wherebythe pin e of the latch passes into the aperture b3 ofthe bolt. Said pin e can only pass into the aperture b3 when the slide d with the pin d0 has traversed the length of the inclined or spiral groove 50 and has turned the breechbolt axially, and when the latch e has arrived at the curved tapered end of the plate f attached to the breech-casing a, when said pin e can be pushed forward by its spring. Vhen moving the breech-block toward the front, an axial movement for the purpose of forcing the breech forward can only take placel after the latch e has been pressed outward by the curved end of the plate f, and thereby the pin e moved out of the aperture of the breech-bolt. (See Figs. 2 and 8.) By reason of the double row of locking-ribs b' b2 and a/ d2, the breech-bolt is locked doubly secure and the rear ribs c2 act as stops for the bolt b. The breech-casing a is further provided with an attachment which permits of firing the gun automatically or withoutv operating the trigger g. The trigger-spring t', Fig. '7, is cut longitudinal, so as to consist of two spring-Shanks z" and i2, of which one shank, t, can be pressed downward by the arm g/ of the trigger, as shown in Fig. 5, whereas the other shank, 2, is not acted upon. As the breech-bolt moves not only longitudinally when closing the breech, but also moves axially, the iiring-pin,which is provided With a lug h projecting through a longitudinal slot b4 in the breech-bolt, must participate in this axial movement, and when the trigger is held in the position shown in Fig. 5 the lug h of the firing-pin iirst engages the end of the shank i2 of the trigger-spring. As said axial movement continues until the lug 71, arrives above the end of the shank 1l of the trigger-spring, and when said trigger-spring is held in lowered position, said lug h cannot engage the same and consequently is released, permitting the firing-pin to be forced forward by its spring to explode the cartridge. The trigger is held in position, as shown in Fig. 5, by an arm 7c on the shaft 7a, which shaft can be turned by means of a small spring-lever m iixed on said shaft within a proper recess in the side of the stock, a projection of said leverm snapping into the depression of a plate Zon the side of the stock, whereby said lever m is locked in place and also locks the trigger in place, as shown in Fig. 5.

For the purpose of locking the loaded firearm in such a manner that it cannot be fired, the spring-lever m is turned so that the hook k2 on the shaft 7o engages the lug h2 of the trigger-lever, (see Fig. 1,) thus preventing the latter from being operated. ln this position also the spring-lever snaps into a suitable depression for the purpose of locking said spring-lever m and the trigger in place. lf the lever fm is locked in a position midway between those described, it permits the trigger to be operated in the usual manner, and the gun can be loaded and iired in the usual manner.

Having thus described my invention, l claim as new and desire to secure by Letters Patentl. In a rearm, the combination, with a breech-casing, of a longitudinally-movable and axially rotative breech -bolt, provided with an inclined or spiral slot, a slide guided on the breech-casing, a pin projecting from the slide into the incline or spiral groove of the bolt, and a latch on said slide, being pressed by a spring into an aperture of the bolt, substantially as set forth.

2. In a iirearm, the combination, with a breech-casing, a guide-bar attached to the side of the casing, a slide mounted on said bar, a pin projecting from the slide, a longitudinally-movable and axially-rotative breechbolt, having an inclined or spiral groove into which the pin on the slide passes, and a latch on said slide being pressed by a spring into an aperture of the bolt, substantially as set forth.

3. In a irearm, the combination, with a breech casing, of a longitudinallymovable and axially-rotative breech-bolt having an inclinedor spiral groove, a slide guided on the breech-casing, a pin projecting from said slide into the inclined spiral groove, a latch on the slide which latch can pass into an aperture in the breech-bolt, and'a plate having a tapered or curved end and being secured on the casing in the line of movement of said latch, substantially as set forth.

4L. In a firearm, the combination with a breech-casing, of a longitudinally-movable and axially-rotatable breech-bolt, a firing-pin in said bolt which is provided with a lug projecting through a slot in the breech-bolt, and a projection arranged in the path of the longitudinal movement of the firing-pin and forming a stop, said lug being enabled to rotate with the breech-bolt and adapted to slide off the stop when the bolt is turned axially, substantially as set forth.

' 5. In a iirearm, the combination with a breech casing, of a longitudinally -movable and axially-rotatable breech-bolt, a firing-pin adapted to rotate with the bolt, a lug on said pin projecting through a slot in the breechbolt, a trigger-spring having two Shanks, each provided with a projection extending into the line of movement of the lug on the firing-pin, and a trigger for actuating or depressing one of said shanks while the projection of the IOO IIO

stock and provided with two arms, one of which is adapted to engage the said lug on the trigger and hold the same in forward position, while the other is adapted to engage the trigger and hold it in backward or pulled position, substantially as set forth.

In testimony whereof I hereunto sign my name, in the presence of two subscribing witnesses, this 23d day of January, 1893.




Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3494216 *May 13, 1968Feb 10, 1970Champlin Haskins IncBolt action for repeating rifle
US4653210 *Feb 28, 1985Mar 31, 1987Poff Jr Charles RFirearm bolt action and extractor
US4930238 *Apr 21, 1988Jun 5, 1990Poff Jr Charles RRimfire firearm receiver
US8533986 *Nov 22, 2011Sep 17, 2013Blaser Finanzholding GmbBolt for a repeating firearm
US20120137557 *Nov 22, 2011Jun 7, 2012Blaser Finanzholding GmbhBolt for a repeating firearm
Cooperative ClassificationF41A15/14