Ejection port closure for firearms

• US 3,938,271 A
• Filed: 03/29/1974
• Issued: 02/17/1976
• Est. Priority Date: 04/05/1973
• Status: Expired due to Term

• Current Assignee: Valmet Oy (Valmet Oyj)
• Original Assignee: Valmet Oy (Valmet Oyj)
• Inventors: Hyytinen, Timo
• Primary Examiner(s): Feinberg, Samuel
• Assistant Examiner(s): Jordan, C. T.
• Application Number:
  US05/456,377
• Time in Patent Office: 690 Days
• Field of Search: 42/16
• US Class Current: 42/16
• CPC Class Codes: F41A 3/26 semi-automatically or automatically operated, e.g. having a slidable bolt-carrier and a rotatable bolt
• CPC Class Codes: F41A 35/02 Dust- or weather-protection caps or covers protecting-caps for trigger guards F41A17/54

Abstract

A firearm which has a receiver formed with an ejection port through which the cartridge case of a spent cartridge is ejected. A bolt is situated in the receiver for movement between a forward firing position and a rear retracted position, a cartridge case being ejected when the bolt is in its rear retracted position. The bolt is also supported in the receiver for rotary movement between locked and unlocked positions. A sleeve is operatively connected to and surrounds the bolt for rotating the latter between its locked and unlocked positions, this sleeve having a length substantially less than the length of the bolt and covering part of the ejection port when the bolt is in its firing position. A cover is provided to cover that part of the port which is not covered by the sleeve when the bolt is in its firing position, and this cover responds to rearward movement of the bolt from its firing to its retracted position for uncovering the ejection port.

Claims

1. In a firearm, receiver means formed with an ejection port through which a cartridge case of a spent cartridge is ejected, elongated bolt means situated in said receiver means for longitudinal movement between a forward firing position and a rear retracted position where said port is uncovered to an extent sufficient for ejection of a cartridge case, said bolt means also being supported in said receiver means for rotary movement between locked and unlocked positions, sleeve means surrounding said bolt means and operatively connected thereto for rotating said bolt means between said locked and unlocked positions thereof in response to longitudinal movement of said sleeve means with respect to said bolt means, said sleeve means having a length substantially shorter than said bolt means and said sleeve means extending across and partially covering said port when said bolt means is in said forward position thereof, said sleeve means moving rearwardly with said bolt means when the latter is displaced from said firing to said retracted position thereof for uncovering said port, and cover means situated in said receiver means for covering that part of said port which is not covered by said sleeve means when said bolt means is in said firing position thereof, said cover means being operatively connected with at least one of the other of said means for responding to movement of said bolt means from said firing to said retracted position to assume a position uncovering said port when said bolt means is in said retracted position thereof, said sleeve means covering a front portion of said port and said cover means covering a rear portion of said port when said bolt means is in said firing position thereof, said cover means being fixed to a rear portion of said bolt means for rotary and longitudinal movement with said bolt means.

2. The combination of claim 1 and wherein a pin extends transversely with respect to said bolt means for fixing said cover means thereto, said bolt means and said cover means being formed with openings which together form a recess for receiving said pin which fixes said cover means to said bolt means.

3. The combination of claim 1 and wherein said cover means and sleeve means cooperate telescopically with said cover means and sleeve means overlapping each other in the retracted position of said bolt means to an extent greater than in the firing position of said bolt means.

4. The combination of claim 3 and wherein said cover means at least partially surrounds said sleeve means at least in the retracted position of said bolt means.

5. The combination of claim 4 and wherein said cover means has a rear end portion fixed directly to said bolt means and has an elongated wall portion extending forwardly from said rear end portion and spaced from said bolt means to define with the latter a space which receives said sleeve means.