Abstract: A threaded rod (40) extends through two blocks (20, 22). Each block (20, 22) has a bore. The bore of the first of the two blocks (20) is not threaded and is prevented from moving when the threaded rod is turned. The bore of the second of the two blocks (22) is threaded and engages the threads of the threaded rod (40). As the rod (40) is turned clockwise or counter clockwise, the second block (22) responds by moving toward or away from the first block (20). One side of each block (20, 22) is connected to a plate (24, 26) which is contoured to fit the inner wall of a tube (11) or pipe. The blocks (20, 22) and plates (24, 26) are pivotally connected by bars (30). A cold welding compound is applied to the plates and the device is inserted into a tube (11) to be repaired. When the plates (24, 26) are aligned over the portion of the tube (11 ) to be repaired, the threaded rod (40) is rotated so that the second block (22) moves toward the first block (20) causing the plates (24, 26) to move outward.

Abstract: The invention provides a fiber testing device for thermomechanical testing of fibers which preferably includes a linear step motor coupled to a first fiber gripping jaw. A second fiber gripping jaw is positioned in linear relation to the first gripping jaw and is coupled to a load cell. Advantageously, the apparatus includes a chamber for maintaining a fiber test specimen in a substantially thermally isolated environment during testing of the fiber. A heating means and a cooling means are connected to the chamber. The heating means and cooling means are controlled by a control means which also controls the position of the linear step motor. The fiber testing device of the invention is capable of performing complicated mechanical and thermal fiber testing protocals without operator involvement except for initiation of the testing sequence.

Abstract: The invention concerns an improved yarn package, process and apparatus. The improved package has particular utility in automated processes for making melt spun yarn. Broadly, the invention comprises (a) a cross wound package of melt spun flat filament yarn that is characterized by the yarn's outer end being pile wound in a compact bunch on the cross wound package's surface, the yarn end comprising at least twenty pile turns, the pile turns comprising upstream pile turns and downstream pile turns, and wherein the upstream pile turns partly underlap the downstream pile turns; and (b and c) modifications to conventional process and conventional apparatus for winding yarns, in order to make such packages, particularly at speeds greater than 3000 mpm.

Abstract: The invention comprises (a) an improved cross wound yarn package on which the final few turns of yarn are wound as a compact pile wound bunch on the cylindrical cross wound package surface; (b) apparatus for winding such a package, comprising a fixed pile winding guide (4 in FIG. 3) as well as a traverse guide (1 in FIG. 3) and means effective to move the yarn from one to the other (5 in FIG. 3); and (c) a modified yarn traverse roll with an extra circumferential groove to aid pile winding (2 in FIG. 1) intersecting a helical traverse groove (1 in FIG. 1).