Firearms – Breech loading – Forward-sliding barrel
Patent
1988-06-23
1990-02-06
Brown, David H.
Firearms
Breech loading
Forward-sliding barrel
42 11, F41C 702, F41D 502
Patent
active
048979490
DESCRIPTION:
BRIEF SUMMARY
This invention relates to firearms
The invention is concerned with a firearm comprising a main housing having a main bore; a breech at one end of the main bore; a barrel having a bore therethrough and a rear end that is telescopically received within the main housing, the barrel being axially movable from a rear position in operative connection with the breech to a forward position; and a firing pin at the breech end of the main bore.
An object of the invention is to provide an improved firearm of this kind.
According to the invention the firearm is characterised in that the housing has a loading passsage through which a cartridge can be inserted into the main bore; and an eject passage through which a cartridge case can be ejected from the main bore and in that the barrel bore inhibits the cartridge casing from passing along the barrel.
In use a cartridge will be homed into the bore of the barrel on rearward movement of the barrel, the firing pin will activate the cartridge only when the cartridge is homed into the bore. The position of the rear of the barrel when it is in its rearward position is such that there will be an adequate sealing between the rear of the barrel and the breech.
Preferably there is further provided a sleeve rotatably fitting in the main bore and telescopically receiving the barrel, the sleeve having a port therein which corresponds in size and axial location to the magazine passage, there being engaging parts on the barrel and sleeve arranged to cause rotation of the sleeve on axial movement of the barrel; the arrangement being such that (i) when the barrel is in the forward position, the port will be adjacent the loading passage; and (ii) when the barrel is intermediate the forward and rear positions the port will be adjacent the eject passage.
The engaging means preferably comprise a cam groove in the barrel and a pin on the sleeve, the groove preferably comprises straight end portions with an inclined mid-portion so that the initial and terminal movement of the barrel is not accompanied by corresponding rotary movement of the sleeve. Suitable means are provided to ensure that the barrel does not rotate relative to the main housing. Where a tubular magazine is used, such means may comprise guides secured to the barrel and sliding over the magazine. A hand grip for use in "pumping" the barrel may be provided covering the guides.
The firing pin may preferably be mounted on a block which is spring loaded forwardly and which is moved rearwardly into the cocked position as a result of the axial movement of the barrel. Preferably there are corresponding cam surfaces on the outside rear of the sleeve and the block which engage when the sleeve is rotated to cause the said block to move as aforesaid.
The firearm may be a single acting weapon. In this arrangement, the firearm may have a firing mechanism that will engage the barrel to hold it in its rearward position, releasing it only on completion of the firing movement after the trigger has been released.
The firing mechanism preferably comprises a trigger, movable in use from a forward position to a firing position, and a rocker device, the rocker device being operatively connected to, preferably by having formed thereon, a sear and a locking pin and a cam surface, and the finger member having a cam member which engages the cam surface; the cam surface being arranged so that in use on initial movement of the trigger from its forward position the rocker device is caused to move so that the locking pin is moved into an operative position in which it operatively engages the barrel to hold it in its rearward position while on further movement of the trigger, the sear is moved to an inoperative position in which it permits the firing pin to move into its firing position. Preferably biassing means, preferably spring means, are provided for biassing the rocker device so that the sear is normally in its operative position.
The firearm may however also be an automatic weapon. In this arrangement, a spring device may be provided to biass the bar
REFERENCES:
patent: 398595 (1889-02-01), Emmens
patent: 877657 (1908-01-01), Mason
patent: 886211 (1908-04-01), Hino et al.
patent: 1179880 (1916-04-01), Wesson
patent: 2102199 (1937-12-01), Dixon
patent: 2699006 (1955-01-01), Maerk
patent: 2835998 (1958-05-01), Maerk
patent: 2963810 (1960-12-01), Robinson
patent: 3680241 (1972-08-01), Ramsay
Material Part of Firearm, Book One, Edited by A. A. Blagonravov, "Oborongiz"1 Publishers, Moscow 1945 English Translation of Russian Document.
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