Patent ID: 7669356
Filing Date: 2010-03-02
Classification: F41A

Abstract:
1. Device for detecting and counting shots fired by an automatic or semi-automatic firearm, comprising: a barrel and moving parts to recock the firearm, sliding in the axial direction of the barrel between a front position and a rear position, wherein the firearm undergoes accelerations in the axial direction of the barrel for every fired shot, caused by a succession of shocks due to the shot being fired and to the movements of the moving parts, wherein the progression in time of the accelerations is typical for a firearm and for the type of ammunition used, thus forming a typical acceleration signature for the firearm and for the type of ammunition, and including an accelerometer with a pass band which is sensitive to shocks in the axial direction of the barrel and a microprocessor for analyzing the signal of the accelerometer while firing, wherein the microprocessor is equipped with an algorithm to count the number of shots fired, based on the discernment and recording of a shot being fired on the basis of the detection, in the signal of the accelerometer, of characteristic elements of the acceleration signature which is typical of the type of firearm and of the different types of ammunition used, said characteristic elements of said acceleration signature comprising acceleration pulses, acceleration variations and calm zones during which the level of the signal of the accelerometer is practically zero, wherein the characteristic elements are defined at least by a duration, a direction, an absolute or relative amplitude, and time intervals therebetween and wherein these characteristic elements are stored beforehand in a memory of the device.