| 摘要 |
Inserted into the receiving chamber of the lock (i.e., trigger, sear and hammer) of a trap type shotgun is an elongated U-shape housing having on the forward end a spring supported loading platform adapted to receive and temporarily carry a shotgun shell inserted through the uncovered ejection port when the breech bolt is retracted rearwardly into open position. Rearward movement of the bolt is simultaneously effective to engage and depress a spring-biased hammer pivotally mounted on the housing, the hammer including a notch for engagement with the latch hook of a sear rockably mounted on the housing. A spring-urged trigger has a portion overlying a flange on the sear so that actuation of the trigger moves the sear latch hook out of engagement with the hammer, thereby allowing the hammer to spring forwardly and strike the firing pin. A safety lever positively immobilizes the trigger in open bolt position and, for automatic shotguns, a bolt detent structure holds the bolt open after each shot until a shell is inserted and a separate trip lever is actuated so as to allow the bolt to close.
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