Firearms – Breech loading – Sliding breechblock
Patent
1998-01-29
1999-12-14
Jordan, Charles T.
Firearms
Breech loading
Sliding breechblock
F41A 300
Patent
active
060001615
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a breech mechanism for a bolt-action firearm, the breech mechanism consisting of a breech body reciprocating in the receiver and rotatable into locking position, having in its front portion a locking lug placed in three sectors.
In all bolt-action systems known per se, either complete breech control or parallel loading has been sacrified so far. There are generally three guide surfaces, and it has been found that the breech mechanism tends to swerve when being opened or closed.
The purpose of the invention is to achieve a breech mechanism of a new type for a bolt-action firearm, which is free of the inconveniences mentioned above. The breech mechanism of the invention is characterised in that the locking lugs in at least two sectors have been formed in a breech mechanism provided with a parallel loading magazine such that there are four guide surfaces to limit rotation of the breech mechanism between the receiver and the breech body. Four guide surfaces provide notably better control of the breech mechanism than solutions known per se. The solution of the invention also enables a loose magazine to be filled without the magazine being detached from the firearm, and thus cartridges can be inserted in the magazine from above, as in a conventional magazine.
One embodiment of the invention is characterised in that the guide surfaces are located in the lower locldng lugs of the sector and symmetrically on each side of the breech body.
A second embodiment of the invention is characterised in that the lower locking lugs have longitudinal grooves, which form two lower guide surfaces, and in that the upper surfaces of the lugs form two upper guide surfaces.
The invention will be described below by means of an example and with reference to the enclosed drawings, in which
FIG. 1 is an axonometric view of the front portion of the bolt action
FIG. 2 is a cross-section of the breech mechanism of the bolt action and
FIGS. 3-6 illustrate bolt-action solutions known per se.
The breech mechanism consists of a breech body 2 reciprocating in the receiver 1 and rotatable into locking position, and having in its front portion a locking lug 3, 4, 5 located in three sectors. The locking lugs in two sectors 4, 5 have been formed in a breech mechanism provided with a parallel loading magazine 6 such that there are four guide surfaces 7, 8, 9, 10 limiting breech rotation between the receiver 1 and the breech body 2. The guide surfaces 7, 8, 9, 10 are located in the lower locking lugs 4, 5 of the sector and symmetrically on each side of the breech body 2. The lower locking lugs 4, 5 have longitudinal grooves 11, 12, which form lower guide surfaces 8, 10 and the upper surfaces of lugs 4, 5 form upper guide surfaces 7, 9. The hook 13 shown in FIG. 1 is a cartridge or shell extractor and the sing pin opening 14 is in the centre.
1. A breech mechanism for a bolt-action firearm, comprising a breech body reciprocating in a receiver and rotatable into a locking position, and having on a front portion thereof a locking lug placed in three sectors, wherein the locking lugs in at least two sectors have been formed in a breech mechanism provided with a parallel loading magazine such that there are four guide surfaces to limit breech rotation between the receiver and the breech body, wherein the guide surfaces are located on lower locking lugs of the sector and symmetrically on each side of the breech body, and wherein the lower locking lugs have longitudinal grooves which form two lower guide surfaces and the lower locking lugs have upper surfaces that form two upper guide surfaces.
2. A breech mechanism for a bolt-action firearm including a parallel loading magazine, the breech mechanism comprising: receiver and to be rotatable to a locking position, the breech body including a front portion having an outer periphery; and portion of the breech body, at least two of the locking lugs including a pair of guide surfaces so that the breech mechanism includes four guide surfaces that cooperate with the receiver to limit rota
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patent: 4547988 (1985-10-01), Nilsson
Buckley Denise J.
Jordan Charles T.
Sako Oy
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