Firearms – Firing mechanism – Rearward sliding breech bolt
Patent
1985-10-29
1988-04-26
Parr, Ted L.
Firearms
Firing mechanism
Rearward sliding breech bolt
42 16, 89189, F41C 1900, F41C 1100
Patent
active
047395710
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a firing mechanism and to a method of, and means for, manipulating a round of ammunition.
BACKGROUND ART
British Patent Application No. 2081429A discloses a firearm for discharge of rounds such as gas canisters and the like. The firearm comprises a body in which there is a cavity for a round of ammunition with a percussion detonating means in a rearward facing surface thereof, at least one transverse aperture for introduction of a round into the cavity and ejection of the round therefrom, a breech block rearward of the cavity and movable to and from a rest disposition to a firing disposition forward of the rest disposition to carry the front of the round forwardly into engagement with a seating at the forward end of the cavity, and a firing pin carried by the breech block with a forward end to impact with the detonating means for detonation and discharge of the round, and a trigger to actuate the movement of the breech block and the firing pin, the firing mechanism comprising means to transmit the trigger movement to the breech block and lock the breech block in the firing disposition.
The prior published application discloses, in particular, an actuating mechanism for a firearm of this type in which use is made of an over-centre toggle linkage to lock the breech block in the firing disposition, and a sear mounted in the body of the firearm for holding and release of the firing pin upon movement of the trigger.
SUMMARY OF THE INVENTION
It is a continuing need in the design of firearms that the number of moving parts should be reduced to a minimum and that the interaction of these parts should be reliable and simple. It is one object of the present invention to satisfy this need rather better than does the previous proposal.
Accordingly, a first aspect of the present invention provides a firing mechanism as described above and characterised by camming means caused to move from a rest disposition to a firing disposition by movement of the trigger, the camming means having a first camming surface which contacts a cammed surface on the breech block to urge the breech block from its rest disposition to its firing disposition and lock the block in the firing disposition until the trigger moves out of its firing disposition, and a second camming surface which contacts a cammed surface on the firing pin during movement of the camming means from its rest disposition to its firing disposition to restrain forward travel of the firing pin during the movement yet allow such forward movement, for actuation of the detonating means, once the breech block is locked in the firing disposition. In accordance with a second aspect of the present invention there is provided a method of introducing a round of ammunition into the cavity of a firearm as described above and allowing ejection of the round therefrom, after firing, the method comprising the steps of:
(i) providing a first pair and a second pair of cooperating engagement surfaces, a static member of each pair being provided on the rear face of the round, and a moving element of each pair being provided on the front face of the breech block, the first pair of surfaces constituting a latch, and engaging when the round is introduced into the cavity with the breech block in its rest disposition to restrain the round from movement out of the cavity, and the second pair constituting a locking means for restraining lateral movement of the rear end of the round when the round is in its forward firing disposition;
(ii) spacing the two moving members apart from one another laterally in the breech block by a distance which is different from that separating the two static engagement surfaces in the rear face of the round;
(iii) so shaping the engagement surfaces that, when the breech block is moved forwardly from its rest disposition to its firing disposition, the static and moving members of the second pair engage one another, despite the noted difference in lateral spacing;
(iv) withdrawing the moving surface of the first pa
REFERENCES:
patent: 4387524 (1983-06-01), Brint et al.
patent: 4471549 (1984-09-01), Brint et al.
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