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US 4,867,040 AGranted
Self-unlocking device for recoiling bolt carrier and barrel in a semi-automatic rifle
OwnerRonnie G. Barrettinventor
Life of this patent
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Abstract
A semi-automatic rifle including a recoiling barrel adapted to carry rearward the elongated bolt carrier containing the bolt for compressing the recoil spring, and a self-unlocking device including a self-unlocking rod longitudinally slidably mounted on the bolt carrier normally engaging the rear face of the barrel in a battery position and a trigger actuating device for thrusting the self-unlocking rod forward during the early stage of recoil for separation of the bolt carrier from the barrel before the barrel reaches the end of its recoil movement.
Claims7
A semi-automatic rifle comprising:
- (a) an elongated housing,
- (b) an elongated bolt carrier received within said housing for longitudinal, reciprocable movement, said bolt carrier having a coaxial forward-opening bolt cavity,
- (c) an elongated bolt slidably received within and projecting forward from said bolt cavity, said bolt comprising radially projecting bolt locking lugs,
- (d) bolt spring means in said bolt carrier, normally biasing said bolt forward,
- (e) cam and slot means interconnecting said bolt carrier to said bolt to provide limited rotary movement of said bolt relative to said bolt carrier during longitudinal movement of said bolt relative to said bolt carrier,
- (f) an elongated recoil spring within said housing for urging said bolt carrier forward,
- (g) an elongated barrel comprising an enlarged rear barrel extension,
- (h) said barrel extension having radially inward directed barrel locking lugs for engaging and disengaging said bolt locking lugs in a battery position,
- (i) support means in said housing for slidably receiving said barrel, stop means in said housing for limiting the rearward movement of said barrel within said housing,
- (k) barrel spring means connecting said barrel and said housing to bias said barrel forward to a battery position,
- (1) a self-unlocking member mounted for longitudinal movement on said bolt carrier and being adapted to engage said barrel extension in said battery position,
- (m) trip means operatively connected to said self-unlocking member to cause said self-unlocking member to move forward against said barrel extension during the initial recoil movement of said bolt carrier and said barrel to thrust said barrel away from said bolt carrier, thereby automatically causing said bolt locking lugs to rotate relative to said bolt carrier to disengage said barrel locking lugs and to separate said bolt from said barrel.
9 more elements
Dependencies are inferred from the claim text.