Firearm with facility for open-bolt and closed-bolt operation

a technology of closed-bolt operation and open-bolt, which is applied in the field of selectfire rifles, can solve the problems of increased susceptibility to dirt and contamination entering the action and chamber, increased risk of malfunction, and less accurate aimed fire of open-bolt arms, so as to avoid the noise of bolt closure
US20100236394A1Active Publication Date: 2010-09-23LWRC INTERNATIONAL
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
LWRC INTERNATIONAL
Publication Date
2010-09-23

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Abstract

A firearm has a frame with a barrel connected to the frame and defining a barrel axis. The barrel has a rear end defining a chamber, and a bolt assembly reciprocates with respect to the chamber between a closed position adjacent the chamber, and an open position away from the chamber. A fire control assembly includes a trigger and a selector switch with a semi-automatic position and a fully-automatic position. The fire control assembly includes a bolt assembly sear operably engaging the bolt. The fire control assembly operates when the selector switch is in the semi-automatic position in response to pulling the trigger to discharge the firearm, to load a cartridge, and to position the bolt in the closed position. The fire control assembly operates when the selector switch is in the fully-automatic position in response to pulling the trigger to discharge the firearm, and to hold the bolt in the open position. The fire control may include a sub-frame connected to the frame and to the bolt assembly sear, and may include a safety sear that prevents firing out of battery when in either full-auto or semi-auto modes. The fire control system may include a facility that momentarily maintains the trigger in a firing position when it is released while the bolt is moving forward from the open position.
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Description

FIELD OF THE INVENTION

[0001] This invention relates to the firearms, and more particularly to select-fire rifles.BACKGROUND AND SUMMARY OF THE INVENTION

[0002] Certain firearms may operate to fire either from an open bolt configuration or a closed bolt configuration.

[0003] Open bolt operation proceeds with a trigger pull causing a retracted bolt to move forward, stripping a cartridge from a magazine or belt, chambering the cartridge, and firing the cartridge. In response to firing one or more rounds, the bolt is forced back to the open position, where it is held until the trigger is pulled again. Open bolt arms have the advantage of allowing the barrel and chamber to cool more readily after sustained firing by keeping the chamber open. They avoid the risk of “cook-off,” which occurs when a cartridge is chambered into a very hot chamber, and heated to the point of ignition, causing the rifle to discharge even when the trigger is not pulled and a safety is engaged. Open bolt arms also pre...

Claims

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