Patent ID: 8074392
Filing Date: 2011-12-13
Classification: F41B

Abstract:
1. A backlash vibration structure installed in a rear side of a frame of a toy rifle in axial alignment with a piston in a piston-cylinder mechanism, comprising a receiver extension affixed to a rear side of said frame, a weight mounted in said receiver extension and axially movable along said receiver extension relative to said frame, a buttcap spacer detachably fastened to a rear side of said receiver extensions and a reaction spring connected between said weight and said buttcap spacer, wherein said buttcap spacer is detachably fastened to a rear side of said receiver extension and mounted with an adjustment rod; said adjustment rod being fastened to said buttcap spacer and rotatable forwards and backwards relative to said buttcap spacer between a front limit position where said adjustment screw rod is stopped against a rear side of said weight and a rear limit position where said adjustment screw rod is spaced from said weight at a predetermined distance.