ELASTIC PROJECTILE PROPULSION SYSTEMS AND METHODS

摘要

An elastic projectile propulsion system deploys a plurality of springs that bias a common launching cord via a plurality of block and tackle pulleys. Each sheave of the pulley is coupled to the moveable end of a spring such that the force of each spring contributes to the energy imparted to a projectile by the launching cord without adding significant friction or inertial resistance.

主权项

1. A propulsion device comprising:
a) an elongated barrel member forming a cavity having an elongated barrel member proximal end and an elongated barrel member distal end, where the elongated barrel member proximal end engages a mounting stock, b) a pair of forward spring members each having a forward spring member proximal end and a forward spring member distal end, the pair of forward spring members positioned within the cavity of the elongated barrel member wherein the distal ends of the forward spring members connect to a corresponding moveable brace and the proximal ends of the forward spring members connect to a moveable pulley blocks, c) a pair of rearward spring members, each having a rearward spring member proximal end and a rearward spring member distal end, the pair of rearward spring members positioned within the cavity of the elongated barrel member wherein the distal end of the rearward spring members connects to the moveable pulley blocks and the proximal ends of the rearward spring members connects to the corresponding moveable braces, d) at least one pair of forward pulleys, each forward pulley coupled to the forward spring member proximal ends and at least one rearward pulley, connected to each of the rearward spring member distal ends, and e) a launching cord having a first end and a second end wherein the first end engages the forward pulley and second end engages the rearward pulley.