Abstract: A fin for use on a heat exchanger and a method for making the same. The fin is made by stamping individual columns of openings in the fin such that adjacent columns are equally spaced apart. The outermost column of openings is spaced from a side edge of the fin a distance that is about one-half of the distance between adjacent columns of openings. The uniform spacing allows for the construction of a fin requiring any number of columns of openings to correspond to the tube portion that is used to form the heat exchanger. This spacing provides for an efficient and compact design of the tube portion and of the heat exchanger formed with the tube portion and the fins.

Abstract: A universal fin for use on a heat exchanger having a known number of vertical and horizontal tube passes. The universal fin has a plurality of openings arranged in equally spaced columns and equally spaced rows. One or more continuous fins having columns and rows of openings equal to the known number of tube passes can be removed from the universal fin and assembled with a tube portion to form the heat exchanger. The openings on the universal fin are configured so that one or more fins can be separated from the universal fin for use on a heat exchanger regardless of the number of horizontal and vertical passes that comprise the heat exchanger.

Abstract: A fin for use on a heat exchanger and a method for making the same are disclosed. The fin is made by stamping individual columns of openings in the fin such that adjacent columns are equally spaced apart. The outermost column of openings are spaced from a side edge of the fin a distance that is about one-half of the distance between adjacent columns of openings. The uniform spacing allows for the construction of a fin requiring any number of columns of openings to correspond to the tube portion that is used to form the heat exchanger. This spacing provides for an efficient and compact design of the tube portion and of the heat exchanger formed with the tube portion and the fins.

Abstract: A universal fin for use on a heat exchanger having a known number of vertical and horizontal tube passes. The universal fin has a plurality of openings arranged in equally spaced columns and equally spaced rows. One or more continuous fins having columns and rows of openings equal to the known number of tube passes can be removed from the universal fin and assembled with a tube portion to form the heat exchanger. The openings on the universal fin are configured so that one or more fins can be separated from the universal fin for use on a heat exchanger regardless of the number of horizontal and vertical passes that comprise the heat exchanger.

Abstract: A heat exchanger of the finned tube type in which the tubing is formed in a single, continuous length which is bent into a zigzagged or serpentine shape and then inserted through elongated slots formed in a series of fin plates. The invention provides for the production of heat exchangers in which the spacing between tube passes through the heat exchanger, and so the flow pattern of the refrigerant, may be varied to meet the design considerations of the particular heat exchanger application.

Abstract: A method of severing an elongated flat metal tube of the type including upper and lower flat horizontal walls, vertical edge walls and vertical partition walls spaced between the edge walls and interconnecting the upper and lower walls to divide the tube into a series of parallel, generally rectangular, longitudinally extending passages. The tube is cut by forming transverse kerfs in the upper and lower walls of the tube and thereafter exerting a relative pulling force on the tube sections on opposite sides of the plane in which the kerfs have been formed to tear apart the remaining tube material at the severing plane and sever the tube. The kerfs are formed in a two-step broaching operation comprising a first cut in which a narrow generally V-shaped narrow angle kerf is formed and a second cut in which the kerf is widened to provide a wide, generally V-shaped, wide angle kerf.

Abstract: A method for fabricating metallic conduit and the like having exterior surface details such as beads, bulges and flares by inelastic flow of the metal of an extruded blank which does not exhibit the detail. The process comprises the steps of placing a blank in a high pressure die, injecting oil or other incompressible pressure-transmitting fluid into the blank, and using advancing core punches, pressurizing the fluid to cause the metal of the blank to flow into detail cavities of the die.