Abstract:
A tube perforator is provided which has a generally cylindrical mandrel which extends within a tube. The mandrel is hollow and has a passage therein which extends in angular relation to the axis of the mandrel and exits on one side thereof. A punch disposed in the passage can be driven against the tube wall to cause perforation thereof.
Abstract:
In a pipe perforating machine including a cutter head movable through a pipe and cooperating with shear blades carried by the machine frame, a cutter guide consisting of guide ways extending through the pipe and on which the cutter head is slidably mounted, a fixed support for one end of the guide ways, a movable support for the free other end of the guide ways which is detachable from the ways to permit the pipe to be threaded longitudinally over the ways, a fixture detachably mountable on the guide ways at the free end thereof and including a roller on an axis transverse to the pipe and engageable with the frame to support the free ends of the ways when said movable support is disengaged, while still permitting the threading of the pipe over the ways, the cutter head including a toothed cutter wheel and being movable outwardly from the end of the pipe, and a fixture carried by the frame and urged against the end of the pipe, and operable to catch and secure the cutter wheel against rotation as it emerges from the pipe, whereby when it re-enters the pipe, its teeth will always begin cutting perforations at the same distance from the end of the pipe.
Abstract:
A high-tolerance molding device that uses a pulling technique to quickly form a desired elongated hole in a workpiece such as a pipe or a sheet with little material loss, due to the use of single-piece molding, while preventing material degradation. The workpiece is provided with a pilot hole that is smaller than but roughly concentric with the desired elongated hole. This molding device includes a power-coupling arm that can be inserted into the pilot hole; a control unit that controls the movement of the power-coupling arm; and a molding plug that is prepositioned on the opposite side, with respect to the power-coupling arm, of the surface of the workpiece in which the pilot hole is provided.
Abstract:
A punch tool is disclosed for puncturing the walls of heat exchanger tubes when they become worn in order that the tubes may be repaired. Said tool comprises a hardened, longitudinally drilled, steel rod that is able to fit within the heat exchanger tube. A piston with a cutting bit is fit within a milled slot that communicates with the longitudinally drilled hole of the hardened rod. Once the tool is inserted into a tube to be repaired hydraulic pressure is applied and the piston is forced outward thereby puncturing the tube.
Abstract:
The muffler has an outer shell filled with fiberglass wool around a central core tube which conveys the exhaust gases. The core tube is punched from the inside to form a spiral pattern of holes having gas deflecting tongues which project outward in circumferential directions opposed to the direction of the spiral. When the muffler is to be used on an engine producing a stream of exhaust gas having clockwise rotation in the core tube, the spiral pattern of holes is clockwise and the gas is discharged from the holes in counterclockwise directions. For a counterclockwise rotating gas stream the spiral pattern of holes is formed in counterclockwise direction and the tongues deflect the gas from the holes in clockwise directions. The holes are punched and the deflecting tongues are formed by a radial punch which reciprocates through a guide hole in a support tube. The punch is mounted on a crankshaft which rocks the punch back and forth as it is projected and retracted. When a core tube is placed on the support tube the rocking motion of the punch rotates the core tube to properly space the holes circumferentially. By slowly moving the core tube axially, the desired spiral pattern of holes is produced. The direction of the spiral, as a right-hand or left-hand thread, is determined by the direction of rotation of the crankshaft.
Abstract:
The purpose of the present invention is to provide a high-tolerance molding device that uses a pulling technique to quickly form a desired elongated hole in a workpiece such as a pipe or a sheet with little material loss, due to the use of single-piece molding, while preventing material degradation. The workpiece is provided with a pilot hole that is smaller than but roughly concentric with the desired elongated hole. This molding device is characterized by the provision of: a power-coupling arm that moves in a direction roughly perpendicular to the surface in which the aforementioned pilot hole is provided and can be inserted into the pilot hole; a control unit that controls the movement of the power-coupling arm; and a plug that is prepositioned on the opposite side, with respect to the power-coupling arm, of the surface of the workpiece in which the pilot hole is provided. The plug can engage with and move together with the arm.