摘要:
Abase tube for an electrophotographic photoconductive member, is provided with a cylindrical body on which a photoconductive layer is formed; and a first slanting portion formed on a peripheral surface of an end portion of the cylindrical body, and slanting inward toward an end face of the end portion with respect to an axis of the cylindrical body. An axial length of the first slanting portion of the cylindrical body is within a range of 0.3 to 5 mm.
摘要:
A method for manufacturing thread-forming screws wherein the tapered leading end of the screws can include thread portions or sections having sharp crests but wherein the thread-forming screws can be made using conventional flat thread rolling dies. Also provided is a screw blank having a tapered leading end particularly shaped or formed such that when the threads are rolled on the screw blank using conventional flat thread rolling dies, the tapered leading end of the screw will include thread sections having sharp crests.
摘要:
A metal scrap block for use in electric furnaces is of substantially cylindrical configuration and provided in its outer circumferential surface with angularly spaced longitudinal grooves which extend radially inwardly by between about 1/8 and 1/4 of the block diameter.
摘要:
A tapered pole design and a method and apparatus for producing tapered poles are provided. The apparatus includes a tapered mandrel, means for rotating the mandrel, means for directing a tapered strip onto the mandrel, and means for placing the strip in tension as it is wound on the mandrel in a pseudo-helical manner. The tapered strip is preferably curved or formed in several segments attached together in end-to-end relationship at angles formed between the first strip segment and subsequent ones. Longitudinally extending edge portions of the tapered strip preferably slant downwardly to the plane of the strip prior to being wound on the mandrel. This counteracts a tendency for the edges of the strip to curl up when wound under tension. The pole can be removed from the tapered mandrel by a spinning technique or by employing a collapsible mandrel. The pole itself can be made from two separate tapered strips which are wound in opposite directions to provide a double wall tapered pole of maximum strength and stiffness.