Patent ID: 7556032
Filing Date: 2009-07-07
Classification: F41B

Abstract:
1. A bolt for a pneumatic launching device configured to launch a projectile using a pneumatic force, said launching device comprising a longitudinal chamber arranged therein; a pneumatic housing arranged within the longitudinal chamber; a compressed gas storage chamber arranged in the longitudinal chamber and configured to store a quantity of compressed gas for use in a firing operation of the launching device; and an O-ring configured to retain the quantity of compressed gas within the compressed gas storage chamber until the firing operation; said piston rod assembly comprising: a piston rod configured to be disposed longitudinally through at least a portion of the longitudinal chamber of the launching device; a piston surface arranged on the piston rod within the pneumatic housing and configured to move the piston rod longitudinally within the longitudinal chamber in response to a force applied by the compressed gas; a plurality of firing grooves, each firing groove forming a trench in an outer surface of the piston rod and disposed having a length arranged longitudinally along the piston rod, wherein said length is greater than a width of the firing groove, and wherein said firing grooves are configured to be arranged in a position within the longitudinal chamber of the launching device so as to enable compressed gas from the compressed gas storage chamber to enter a compressed gas releasing chamber arranged in the pneumatic housing during the firing operation of the launching device; and a plurality of ribs arranged between the plurality of firing grooves, said ribs being configured to maintain the O-ring in communication with an outer surface of the piston rod and within an O-ring retaining groove arranged at a predetermined location in the pneumatic housing.