Patent ID: 7726291
Filing Date: 2010-06-01
Classification: A01K,F41B

Abstract:
1. A device for releasing a spear shaft of a spear gun, the gun comprising a frame having a longitudinally elongated body for supporting the shaft, and terminating with a grip portion and an underlying trigger connected pivotally to the frame, elastically opposed operation of the trigger being configured so as to release a latch element engaged with a shaped recess formed in a rear end of the shaft so as to withstand a pulling force exerted axially along the shaft by an elastic member connected to the frame that provides a propulsive force for launching the spear, wherein the latch element is formed on a first lever pivotally connected at its front end to a stem attached to the frame and generally parallel to the longitudinal axis, the elastic member maintaining the first lever in a resting position at which the gun is not loaded, the latch element abutting a first shoulder attached to and integrally with the frame and being aligned axially relative to the shaft when it is ready for loading a spear in the elongated body of the frame; the trigger comprising an abutment portion forced elastically against the front end of the first lever and extending forward of a convex upper surface intersecting a concave surface at an edge which, upon rotation of the trigger, traces a first circular trajectory; a second lever being pivotally connected to the frame at a point generally behind the latch element and below the front end of the first lever, the front end of the second lever being displaceable along a second circular trajectory that intersects the first circular trajectory, an arm of the second lever extending so as to intersect the trajectory of the shaft as it is loaded in the gun, whereupon axial movement in loading the spear, the spear shaft first abuts the latch element, thus moving the first lever away from its resting position, then comes to a loaded position, wherein the latch element engages the shaped recess and abuts the arm of the second lever, causing it to rotate until it abuts the first lever at the latch element, simultaneously raising its front end up to and against the convex surface of the trigger, the front end of the first lever being slidingly connected to the stem such that the first lever is adjustably displaceable in the direction of the longitudinal axis so as to vary the point at which the first lever rests against the second lever and thereby adjust the force with which the front end of the second lever rests against the convex surface of the trigger.