Patent ID: 7082658
Filing Date: 2006-08-01
Classification: B21J,Y10T

Abstract:
1. An intake control valve assembly of a rivet-nut gun comprising: a valve cylinder mounted between a handle and a pressure accumulator, and said valve cylinder mounted with an intake control valve which includes: a connector mounted on said valve cylinder on said pressure accumulator, a hollow cylinder is located in a center of said valve cylinder; said hollow cylinder mounted with a control valve facing a trigger of the handle, and said control valve furnished with an intake passage and a guide passage; one side of said hollow cylinder furnished with a threaded hole mounted with a muffling screw inserted therein; a plurality of spacing rings, of which each outer surface is furnished with a ring-shaped groove; a surface on both sides of said ring-shaped groove being in contact with an inner surface of said hollow cylinder; a center of said spacing rings is furnished with a cylindrical hole; a surface of each said ring-shaped groove is furnished with a plurality of through holes; a seal ring mounted between every two of said spacing rings; a seal ring being substantially an O-ring to be mounted between two said spacing rings; a positioning disk being a round disk with a center through hole, and mounted on a bottom of said hollow cylinder; a spring, of which a first end being mounted on said positioning disk, and a second end extending into a center cylindrical hole of said valve rod and pushing against an inner surface thereof; a valve rod having a center cylindrical hole, and an outer surface thereof furnished with two sets of ring-shaped grooves for receiving a plurality of spacing rings and seal rings arranged alternately; a fastening ring having a center cylindrical hole, and an outer surface thereof furnished with ring-shaped grooves having a through hole in communication with said center cylindrical hole, and said fastening ring mounted on an outer end of said hollow cylinder and being fastened in place with a retaining ring.