Firearms – Breech loading – Sliding breechblock
Patent
1986-01-15
1987-10-13
Brown, David H.
Firearms
Breech loading
Sliding breechblock
42 7001, F41C 700, F41C 1708
Patent
active
046989315
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a rifle bolt mechanism of the turning bolt action type where the bolt is movable relative a breech mechanism and by turning is lockable in the firing position in the breech mechanism, and where a firing pin united with a firing pin nut is arranged in the bolt, which is provided with a handle for operation, the firing pin nut being mounted non-rotatably but axially displaceably in a guide sleeve, which in turn is displaceably mounted in the breech mechanism.
A well-known example of this type of rifle bolt mechanism is the Mauser mechanism. One of the disadvantages with this type of mechanism is that the guide for the bolt is very short, which causes the axial movements of the bolt in the breech mechanism to be jerky as a result of the bolt coming out of alignment. This makes handling the weapon more difficult, inter alia for marksmanship shooting.
To obtain a better guidance of the bolt, it has been proposed in the Swedish published specification No. 339 645 to mount a guiding fork rearward of the breech mechanism for guiding the bolt. However, such a mounting fork makes the weapon more complicated and also requires extra space. Furthermore, precision will not be as good as when the improved guide is incorporated in the mechanism to start with.
The object of the invention is to provide an improved rifle bolt mechanism where the bolt is very well guided in the breech mechanism. A further object of the invention is to provide a bolt mechanism which is simple and reliable from the aspects of manufacture and maintenance.
These objects are achieved in accordance with the invention by the volt being mounted turnably but axially immovably in the guide sleeve and being guided in the breech mechanism via the guide sleeve. The bolt is suitably guided here in the guide sleeve along the major portion of its length, and a particularly advantageous embodiment is obtained if the forward end of the guide sleeve, when the bolt is in the firing position, reaches substantially as far as the forward end of the breech mechanism cartridge opening.
By both the firing pin nut and bolt being accommodated in the guide sleeve, it can be made very long. This results in that the bolt is given very good axial guidance, thus obtaining a smooth and comfortable action, without any binding tendency. Furthermore, the bolt is given very good mounting for rotation, with the consequence that its forward end may be given an exact locking position reltive the cartridge position, which is essential for precision weapons.
Further distinguishing features and advantages of the invention will be perceived from the following description and claims.
The invention will now be described in detail with the aid of an embodiment illustrated on the accompanying drawing, where:
FIG. 1 is a side view of a breech mechanism where a bolt mechanism in accordance with the invention is shown in the firing position;
FIG. 2 is a view from above of the breech mechanism in FIG. 1, with the bolt mechanism in a partially withdrawn position;
FIG. 3 is a side view of the bolt mechanism in accordance with the invention in the state it is in after being spring-biassed;
FIG. 4 is a view from below of the bolt mechanism of FIG. 3 after firing;
FIG. 5 is the same view as in FIG. 4 but with the bolt mechanism ready for dismantling;
FIG. 6 illustrates the bolt mechanism in FIG. 5 in a dismantled state;
FIG. 7 is a perspective view of the guide sleeve;
FIG. 8 is a perspective view of the firing pin with its associated nut;
FIG. 9 is a perspective view of a detail of the bolt;
FIG. 10 is a section along the line X--X in FIG. 6; and
FIG. 11 illustrates the function of a safety device.
In an inventive rifle bolt mechanism, as is apparent from FIGS. 1 and 2, a breech mechanism 1 is displaceably mounted in a breech mechanism 2, the forward end of which is attached to a barrel 3. The breech mechanism 2 is intended to be provided on its underside with a triggering arrangement 4, which may be of conventional type, and therefore does not need to be described
REFERENCES:
patent: 3387400 (1968-06-01), Badali et al.
patent: 3710492 (1973-01-01), Tirrell
patent: 4305218 (1981-12-01), Godsey
patent: 4454672 (1984-06-01), Timari
patent: 4547988 (1985-10-01), Nilsson
Brown David H.
Carone Michael J.
Lano Vapen och Finmekanik
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