Patent ID: 6994009
Filing Date: 2006-02-07
Classification: B21D,B23D,Y10T

Abstract:
1. A pipe cutter comprising: a cylinder with a top end and a rod end; a piston slidably mounted in the cylinder; a top end plug with a crimped cartridge bore on the top end of the cylinder; a bolt and firing pin assembly attached to the top end of the cylinder; a primary gas expansion chamber in the top end plug and between the top end plug and the piston and connected to the crimped cartridge bore; an inner chamber for gas expansion in the piston and a value seat and a gas metering piston pin between the primary gas expansion chamber and the inner chamber; a head end chamber, for gas expansion, inside the cylinder and between the piston and the top end plug, and wherein the head end chamber is separated from the primary gas expansion chamber when the piston is at an upper limit of movement toward the top end; a shear housing connected to the rod end of the cylinder and including a pipe passage; and a shear plate slidably mounted in the shear housing for slidable movement along a shear path that intersects the pipe passage and wherein the shear plate is connected to the piston and moveable with the piston.