Firearm having slide with cam

摘要

A barrel for a semiautomatic firearm operating under the short recoil system has one or more cam followers projecting outwardly to engage one or more cams positioned on an inner surface of a slide surrounding the barrel. Interaction between the cams and the cam followers controls the angle between the longitudinal axis of the barrel and the axis of motion of the slide to prevent the breech end of the barrel from moving too far as the barrel tilts as it unlocks from the slide, ensuring that the extractor will engage the rim of a spent casing and extract it from the chamber during recoil.

主权项

1. A firearm comprising:
a frame; a slide mounted on said frame and reciprocably movable relative thereto along a slide axis, said slide having an inner surface defining a central space; a first cam positioned on said inner surface of said slide, said first cam comprising a recess in said inner surface of said slide, said first cam further comprising a run surface on said inner surface of said slide, said recess having a floor surface offset from said run surface in a direction transverse to said slide axis; a barrel mounted on said frame and positioned within said central space, said barrel comprising: a tube having a breech end and a muzzle end oppositely disposed, said tube defining a longitudinal axis extending lengthwise along and positioned coaxially within said tube; a chamber comprising said breech end of said tube; a means for arresting motion of said barrel positioned underlying said chamber; a first cam follower positioned on said tube between said breech end and said muzzle end, said first cam follower comprising a projection extending outwardly from said tube in a direction angularly offset from said means for arresting motion about said longitudinal axis so as to align with said first cam, said recess facing said first cam follower, said run surface positioned between said recess and said muzzle end; wherein said first cam follower engages said first cam upon sliding motion of said slide relatively to said barrel, engagement between said first cam follower and said first cam determining an orientation angle between said longitudinal axis of said barrel and said slide axis during operation of said firearm.