Kazuhiko Nakagawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A method and apparatus for unloading a tire from a tire vulcanizer wherein following the vulcanization of the tire within upper and lower molds the tires withdrawn from a bladder through tire support arms travelling in a given trajectory and is then transferred on to a device which in turn conveys the tire to the next succeeding step, the method utilized in accordance with the apparatus including the steps of forwarding the tire support arms in a horizontal direction to correspond to sides of the bottom of the tire to be removed, elevating the arms in a vertical direction together with the tire for removing the tire therefrom and transfering the tire onto the conveying device via a path different from that for the forwarding arms while the tire is being held in a horizontal position.
Abstract: The specification describes a tire vulcanizer adapted for use in performing the shaping and curing operation of a green tire efficiently and safely. The vulcanizer is characterized by means for lifting or lowering an upper ring, which includes a rotary means consisting of a ball screw shaft and nut cylinder, and a mechanism adapted to render said ball screw shaft rotate freely upon receiving a signal which is generated upon the completion of the shaping and curing operation.
Abstract: An extruder with a roller die in which a plastic or rubber material fed from a mixer is formed into a sheet by a roller die located at the fore end of a screw feeder which includes a cylinder and a revolving screw, the screw feeder employing a short screw shaft which has its base portion rotatably supported in the cylinder and a non-contacting screw portion essentially including a feed portion and a compression portion and disposed in the cylinder with a small gap being formed between the screw portion and the inner periphery of the cylinder. The pressure distribution in the screw feeder is controlled such that the maximum pressure in a compression zone and the pressure at the fore end of the cylinder are maintained in the ranges of 52.times.10.sup.3 to 200.times.10.sup.3 gr/cm.sup.2 and 20.times.10.sup.3 to 60.times.10.sup.3 gr/cm.sup.2, respectively.
Abstract: A mixing and kneading machine including a pair of parallel rotors each having a long vane and a short vane, both of which extend spirally about the center line of the rotors. A length ratio of the short vanes to the long vanes is selected within a range of 0.48 to 0.1. Also described is a mixing and kneading device which has a pair of parallel rotors rotating in opposite directions within a mixing chamber defined by a casing and an end frame. Each of the rotors comprises a long vane and a short vane, both of which extend spirally about the center line of the rotor, the spiral direction thereof being selected such that material to be mixed flows from the edges of the rotors into the central portion thereof. The ratio of the length of the short vane to that of the long vane is determined within the range of 0.48 to 0.1 and a ratio of axial thrust exerted on the material by the short vane to that by the long vane is determined between 0.7 and approximately 0.
Abstract: A conveying method for conveying green tires from storing devices, disposed near building machines, to curing machines and attaching them to the curing machines is disclosed wherein a green tire delivery demand signal is emitted, from a specific curing machine among a plurality of curing machines, to a control system which stores the corresponding relationships between the respective storing devices and the respective curing machines and the quantities and kinds of green tires stored in the storing devices. The control system which receives this demand signal sends a signal, indicating the curing machine which has emitted the demand signal and the corresponding specific storing device, to an automatic truck supporting and carrying thereon a mechanism which is capable of withdrawing a green tire from the storing device, having it suspended thereon, and loading it onto the curing machine.
Abstract: A charging device for a vulcanizing press has a cylinder disposed concentrically with a vulcanizing mold, a movable piston vertically movable through the cylinder, a piston rod secured to the piston, and a gas-tight cylindrical bladder of a flexible material held between the upper end of the piston rod and the top of the cylinder.
Abstract: A method for curing tires especially adapted for curing very large-sized or so-called giant tires which have not been generally in such demand as to warrant mass production characterized by holding the curing mold in a stably closed locked condition during the curing process under purely mechanical force in contrast to hydraulic force such as heretofore employed, comprising the steps of placing a mold unit composed of upper and lower mold halves and containing a semi-shaped "green" tire upon a stand of a mechanical press having a plunger mechanism supporting an upper housing member moved by means of a crank gear, driving the crank gear to a first position located ahead of its lower dead center a predetermined amount whereby the plunger mechanism and housing section are smoothly and continuously moved through an arcuate path from a raised position to a lowered position at which the plunger mechanism and housing member are adjacent the upper mold half, adjusting the position of the plunger mechanism relative to