Rotary port cover
AssigneeRemington Arms Company, Inc.
InventorsJames C. Hutton, Thomas G. Bauman, Kenneth C. Rowlands
Life of this patent
Estimating the term…
Abstract
An ejection port cover for a firearm which moves in pure rotation about an axis parallel to the bore of the firearm. The port cover is held about this axis and is oriented in the "open port" and "closed port" rotational position for proper alignment of a port cover cam with associated cam pin means on the reciprocating slide assembly since the port cover is shorter than the stroke of the slide assembly that engages and causes rotation of the port cover.
Claims31
In an ejection port covering mechanism for a reciprocating action firearm comprising:
- a hollow receiver having an ejection port therein, a bolt assembly slidably mounted in said receiver to move from a breech closed position to a breech open position, a port cover for covering said ejection port when the bolt assembly is in the breech closed position and which uncovers the port when the bolt assembly is retracted from the breech closed to the breech open position, the improvement comprising:
- means for supporting said port cover in said receiver to prevent longitudinal movement while permitting rotational movement of the port cover relative to said receiver, cam means on said bolt assembly engaging cam means on said port cover during a portion of the longitudinal stroke of said bolt assembly for rotating said port cover into port closed position when the bolt assembly is moved forwardly into the breech closed position, said cam means on said bolt assembly moving a greater distance longitudinally than the length of the port cover so that the bolt assembly cam means moves out of the port cover cam means at least at one end of said port cover, and means for retaining said port cover cam means in proper alignment with said bolt assembly cam means when the bolt assembly cam means is positioned outside of said port cover cam means.
A firearm having a hollow receiver in which a bolt assembly reciprocates from a rear, breech open position to a forward, breech closed position, an ejection port in said receiver, a port cover mounted in said receiver, means restraining longitudinal movement of said port cover relative to said receiver while permitting rotational movement into and out of ejection port covering position, cam pin means on said bolt assembly, corresponding cam track means on said port cover, said pin means and said cam track means cooperating to cause rotational movement of said port cover during a portion of the total reciprocating stroke of said bolt assembly, said port cover being shorter in length than the length of stroke of said cam pin means so as to permit a compact port cover which is slightly longer than said ejection port.
A break open firearm in which a barrel assembly is hinged to a frame so that when unlatched, the barrel assembly and frame can pivot relative to each other from a closed position to a break open position, said barrel assembly comprising a barrel extension at its breech end, said barrel extension and said frame cooperating to form a hollow receiver in which a bolt assembly is slidably mounted to reciprocate from a rear breech open position to a forward breech closed position, an ejection port in said barrel extension, a port cover for covering said ejection port when the bolt assembly is in the breech closed position, means on said barrel extension for restraining longitudinal movement of said port cover relative to said barrel extension while permitting rotational movement, cam pin means on said bolt assembly engaging cam track means on said port cover during a portion of the longitudinal stroke of said bolt assembly for rotating said port cover to cover or uncover the ejection port depending on whether the bolt assembly is moving forwardly or rearwardly, and means for retaining said cam track means in proper alignment with said cam pin means when said cam pin means is moved out of said cam track means.
Dependencies are inferred from the claim text.