Head First

Abstract: The countermanding task requires subjects to cancel a planned movement on appearance of a stop signal, providing insights into response generation and suppression. Here, we studied human eye-head g...

Abstract: A bi-directional magnetic head assembly comprises a first write head adjacent to a read head, adjacent to a second write head. The three heads are in-line, so that the tape engages one or the other write head followed by the read head for either direction of tape motion. The central read head has slots on either side of its transducing region for skiving of entrained air and debris from the tape before the tape engages the transducing element of the read head for either direction of tape travel. On the other hand, each write head has only a single slot for skiving entrained air and debris; a slot being located in each write head structure outboard from the write transducing gap. In reading while writing during bi-directional operation, the write head first approached by the tape for a given direction of motion is the active, writing head. Because the slot is on the outboard side of each write head structure, skiving action occurs prior to the tape reaching the active write transducing gap. However, after the tape successively passes over the writing head and read head, it approaches the second, presently inactive write head from the inboard side of the second write head structure. The approach to the head gap from this direction is over a gently curved, unslotted portion of the second write head. Attendantly, there is minimal skiving action, and entrained air causes the tape to fly without substantially contacting the inactive write structure.

Abstract: A tubular fastener has an axially extending tubular shank receivable in a work bore and an annular head receivable in forcible engagement with the work material forming a counterbore. The fastener also is characterized by: (a) the head having an annular end face, a first forwardly tapered section located forwardly of that end face to forcibly engage the work counterbore and a second forwardly tapered section located forwardly of the first section, the taper angularity of the second section substantially exceeding the taper angularity of the first section, (b) a stem extending through the tubular shank and head, and (c) structure responsive to retraction of the stem toward the head end of the fastener to expand at the opposite end of the fastener and axially retain the fastener in position with the head first section forcibly engaging the counterbore, in non-rotating condition.

Abstract: A hinge pin removal tool for removing a head capped pin from a knuckled door hinge. The hinge pin removal tool comprises an elongate shaft, a generally planar tool head attached to the elongated shaft which extends therefrom. The tool head includes a first and a second end. The tool head is attached to the elongate shaft proximate to the second end of the tool head. The tool head further includes a tapered chisel edge disposed at the tool head first end, and an elongate pin punch disposed orthogonally to the tool head intermediate the chisel edge of the first end and the second end. The tool head may be disposed orthogonally to the elongate shaft. In a second embodiment the tool head and elongate shaft are substantially collinear. The hinge pin removal tool may further include an open slot disposed in the chisel edge which extends inwardly therefrom toward the second end of the tool head. The slot width is sized to accommodate a hinge pin shaft. The hinge pin removal tool shaft may include a first and a second end, wherein the first and second end each include a tool head attached thereto. In this version of the hinge pin removal tool, the two tool heads are disposed at opposite directions relative to each other. Each tool head includes a chisel edge and an elongate pin punch.