Abstract: Method and apparatus is disclosed for severing flat tubing. A length of tubing is gripped at longitudinally spaced apart locations and the tubing is deeply scored by rapidly rotating circular cutters which are moved across the faces of the tubing at a predetermined linear velocity. The angular velocity of the circular cutters greatly exceeds the linear velocity of traversal. An axial force is applied to separate the tubing.

Abstract: Method and apparatus for separating thin-walled flat metal tubing are disclosed. The tubing has flat upper and lower walls joined by end walls. The tubing is partially severed by providing relative movement between the tubing and opposed cutting blades having straight or slightly curved cutting edges. The relative movement is transverse to the longitudinal axis of the tubing, and the straight slicing edges, or the chords of curved slicing blades, form a small acute angle with respect to the flat faces of the tubing. The tubing is completely severed by applying an axial force to the tubing. Pressing heads follow the slicing blades to press any burrs back into the tubing.

Abstract: Method and apparatus is disclosed for severing flat tubing. The method involves the steps of clamping a length of tubing, deeply scoring the tubing on opposite sides and applying a high impact axial force to sever the tube.

Abstract: An improved tube and fin heat exchanger and a method and apparatus for making the same is disclosed. The head exchanger includes spaced end sheets and a stack of plate fins positioned therebetween. Hairpin tubes extend through the end plates and the stack of fins. The tubes are initially sized to loosely fit through the end sheets and fins and are expanded into tight heat exchange engagement therewith during manufacture. The end sheets are accurately positioned a fixed distance apart by a method and apparatus in which the end sheets are held a fixed distance apart during the expansion of the tubes. The bent ends of the hairpin tubes are moved upwardly through the adjacent end sheet and the fins ahead of the expansion bullets to compensate for the shortening of the tubes created by the expansion operation.

Abstract: A rod mounting system for mounting expander rods in tube expander machines is disclosed. The mounting structure includes an opening in a header sized to receive the end of a mounting rod. A key extends into the opening from one side thereof. The rod end is provided with two longitudinally extending keyways and a peripheral groove. The first keyway extends from the end of the rod to an end face aligned with the peripheral groove. The second keyway extends from a location spaced from the end of the rod in both directions beyond the peripheral groove. The rod is installed in the header by longitudinal movement in an installation and removal orientation in which the key is aligned with the first keyway. When the rod engages the inner end of the first keyway, it is rotated to position the second keyway and the key in alignment. In such orientation, the rod is locked within the header for movement between two limits of longitudinal movement.

Abstract: A power driven dereeling apparatus comprising a supporting frame which carries for rotation thereon a table adapted to carry a reel of strand material coiled thereon. An electric motor is connected to rotate the table. A device is provided for sensing the tension of a strand being drawn off the reel, this device being fixedly disposed relative to the frame. The device further includes a cam roller engageable by a strand being drawn off the reel, the roller being movable between first and second positions in response to a predetermined change in tension of such strand. An electrical switch is disposed to be responsive to movement of said cam roller to said first position due to an increase in tension for energizing the aforesaid motor. This in turn causes rotation of the table and reel mounted in a direction to pay strand material off the reel.