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US 4,232,583 AGranted
Firearm with recoil movement delaying mechanism
OwnerDonald G. Harrisoninventor
Life of this patent
Estimating the term…
Abstract
Automatic or semiautomatic firearms which operate on the blowback principle are equipped to fire more powerful cartridges by the provision of a simple lightweight mechanical recoil movement delaying mechanism which increases the breech opening delay time so that the higher gas pressure in the weapon's firing chamber resulting from the use of more powerful cartridges will have time to drop to a safe level. A second embodiment of the recoil movement delaying mechanism is employed to provide a simple inexpensive locking device for use on automatic or semiautomatic firearms which operate on the locked breech principle.
Claims12
An automatic or semiautomatic firearm comprising in combination:
- (a) a frame;
- (b) a recoiling breechlock on said frame and longitudinally reciprocally movable relative to said frame between a breech opening position and a breech closing position;
- (c) roller means mounted in said frame and reciprocally movable into and out of the movement path of said recoiling breechblock;
- (d) means in said frame for reciprocally mounting said roller means therein;
- and
- (e) a hammer pivotably mounted in said frame for movement from a cocked position to a fallen position, said hammer having a cam surface formed on its leading edge which is disposed to engage said roller means upon movement of said hammer to its fallen position to drive said roller means into the movement path of said recoiling breechblock to delay movement thereof to its breech opening position.
3 more elements
An automatic or semiautomatic firearm comprising in combination:
- (a) a frame;
- (b) a barrel fixedly mounted on said frame;
- (c) a breechblock slidably mounted on said frame for recoil movement from a breech closing position to a breech opening position upon firing of the firearm;
- (d) biasing means in bearing engagement with said barrel and said breechblock for yieldingly urging said breechblock to its breech closing position;
- (e) a roller mounted in said frame for reciprocal movement in a path into and out of bearing engagement with said breechblock;
- (f) mounting means in said frame for reciprocally mounting said roller therein;
- and
- (g) a hammer pivotably mounted in said frame and movable between a cocked position and a fallen position to fire the firearm, said hammer having a cam surface formed on the leading edge thereof which engages said roller upon movement of said hammer toward its fallen position to drive said roller into wedged bearing engagement with said breechblock, the cam surface of said hammer configured to present a segment thereof in an angular attitude in the movement path of said roller when said hammer is in its fallen position to hold said roller in bearing engagement with said breechblock and to resistingly delay movement of said roller out of engagement with said breechblock during initial recoil movement thereof.
5 more elements
An automatic or semiautomatic firearm comprising in combination:
- (a) a frame;
- (b) a barrel on said frame;
- (c) a breechblock slidably mounted on said frame for recoil movement from a breech closing position to a breech opening position upon firing of the firearm;
- (d) a hammer pivotably mounted on said frame and movable from a cocked position to a fallen position to fire the firearm;
- (e) a cylinder mounted on said frame;
- (f) a piston reciprocally mounted in said cylinder for movement between a first and a second position, said piston having an axially extending means for engaging said hammer and said breechblock;
- (g) biasing means in said frame and in bearing engagement with said frame and the axially extending means of said piston for yieldingly urging said piston to the first position thereof and for yieldingly urging said breechblock to its breech closing position;
- (h) a roller mounted in said frame for reciprocal movement into and out of bearing engagement with said breechblock;
- (i) mounting means in said frame for reciprocally mounting said roller therein;
- (j) said hammer having a cam surface formed on the leading edge thereof which engages said roller upon movement of said hammer to its fallen position to drive said roller into bearing engagement with said breechblock, the cam surface of said hammer having a substantially flat segment which is disposed transverse to the movement path of said roller to lock said roller in bearing engagement with said breechblock when the hammer is in its fallen position;
- and
- (k) said cylinder having a port which is coupled to the bore of said barrel so that gas pressure subsequent to firing of the firearm will move said piston to its second position to cause the axially extending means thereof to rotate said hammer toward its cocked position to move the flat segment of the cam surface of said hammer out of the movement path of said roller.
9 more elements
An automatic or semiautomatic firearm comprising in combination:
- (a) a frame having a first abutment and a spaced second abutment;
- (b) a housing mounted on said frame for reciprocal movement from an extended position into engagement with the first abutment of said frame upon firing of the firearm, said housing having a barrel;
- (c) a breechblock slidably mounted on said housing for movement from a breech closing position to a breech opening position upon firing of the firearm;
- (d) biasing means in bearing engagement with said breechblock for yieldably urging said breechblock to its breech closing position and said housing to its extended position;
- (e) a hammer pivotably mounted on said housing for movement from a cocked position to a fallen position to fire the firearm;
- (f) a hammer strut extending from said hammer and having means for biasing said hammer to its fallen position;
- (g) a roller mounted in said housing for reciprocal movement into and out of bearing engagement with said breechblock;
- (h) mounting means in said housing for reciprocally mounting said roller therein;
- (i) said hammer having a cam surface formed on the leading edge thereof which engages said roller upon movement of said hammer to its fallen position to drive said roller into bearing engagement with said breechblock, the cam surface of said hammer formed with a substantially flat segment which is disposed transverse to the movement path of said roller to lock said roller in bearing engagement with said breechblock when said hammer is in its fallen position;
- and
- (j) said hammer strut disposed proximate the second abutment of said frame so that upon firing of the firearm said hammer strut will move into engagement with the second abutment to pivotably move said hammer toward its cocked position to move the flat segment of the cam surface of said hammer out of the movement path of said roller.
8 more elements
Dependencies are inferred from the claim text.