Abstract: A quick pressure reducing apparatus is used in vacuum packing of clothing, food, or the like. In order to quickly shift the interior of a preservation bag from the atmospheric state to a pressure reduced state, a reservoir tank is provided which is connected to a rotary pump functioning as a vacuum pump. By establishing communication between the reservoir tank and the preservation bag via an adapter, the internal pressure of the preservation bag can be sufficiently reduced. The adapter has a retractable communicating tubular member so as to smoothly reduce the internal pressure of the preservation bag. The adapter is inserted into the opening portion of the preservation bag whose internal pressure is to be reduced, thereby establishing communication between the preservation bag and the reservoir tank via the communicating tubular member. The opening portion of the preservation bag, together with the inserted adapter, is held between the upper and lower holding members.

Abstract: A heat insulating film comprises a plastic film, a surface metal layer coating the plastic film, a thin metal layer coating the surface metal layer and a protective membrane layer coating the thin metal layer. The surface metal layer has crystal grains having flat upper surfaces and the thin metal layer has flat crystal grains disposed in a single grain layer and formed and overlying respective flat upper surfaces of the crystal grains of the surface metal layer. Heat rays which irradiate on the heat insulating film pass freely through the protective membrane layer but are reflected by the crystal grains of the thin metal layer. Absorption of heat rays by the heat insulating film is remarkably suppressed.

Abstract: A turbomolecular pump comprises a casing having an inlet port at one end portion and an outlet port at another end portion, a rotor supported rotatably within the casing, and a stator fixed on an inner wall of the casing. The rotor has rotor vanes which coact with stator vanes on the stator to pump gas molecules from the inlet port to the outlet port. The rotor and stator vanes are arranged in multi-steps and have ceramic surfaces at the steps near the outlet port of the casing and have metallic surface at all other steps, so as to promote the baking efficiency and obtain extremely high vacuums.

Abstract: An electrostatic dust collector including a wall enclosing a vacuum chamber in which a target face to be subjected to dust removal is provided, a radiation emitting device for emitting radiation to dust on the target face so as to charge the dust positively or negatively, a dielectric member which is provided in the vacuum chamber and has a collecting face confronting the target face and a member for imparting negative or positive potential to the collecting face such that the dust charged oppositely is attracted to the collecting face.

Abstract: An apparatus for cooling various types of heating sources in vacuum, wherein the heating source is adapted to be electronically cooled by the cooling portion thereof with the Pelter effect disposed in the vacuum by the feeding of the current from a DC power supply into a circuit formed by the use of the thermoelectric materials, resulting in that the response speed of the cooling may be improved, and the pollution within the vacuum portion may be prevented.

Abstract: Disclosed is a vacuum container for transporting one or more articles in the vacuum atomsphere. To this end, the vacuum container comprises a container body which can be maintained in the air-tight state and which is formed with a hole through which one or more articles are inserted into or removed out of said container body, a gate valve for opening or closing the opening of the container body, vacuum maintaining pump means communicated with the container body in order to maintain the interior thereof at an extremely high degree of vacuum and retaining means disposed within the container body for releasably retaining at least one article. With the vacuum container with the above-described construction, one or more articles which cannot be exposed to the surrounding atmosphere because of various reasons can be transported in the vacuum state in a stable manner.

Abstract: An electrostatic dust collector including a wall enclosing a vacuum chamber in which a target face to be subjected to dust removal is provided, an electron beam emitting device for emitting electron beams to dust on the target face so as to charge the dust negatively, a dielectric member which is provided in the vacuum chamber and has a collecting face confronting the target face and a member for imparting positive potential to the collecting face such that the dust charged negatively is attracted to the collecting face.

Abstract: Electromagnetic parts have windings composed of an inorganic insulating cable including a metal sheath, an inorganic insulating material, and conductive wires. Thereby, the windings are adapted to have higher heat resisting properties by selectively employing a material having a higher melting point and not changing its state even at temperature of about several hundred degrees Celsius as the sheath and the conductive wire.

Abstract: A coolant preservation container having vacuum space in a peripheral portion of the interior thereof for making a container member adiabatic and a partition for dividing the container member into a plurality of chamber. Each chamber has ports from and via which a coolant is taken out from and returned to the chamber. These ports are suited to circulate a coolant contained in the chamber on external cooling trap.

Abstract: A vacuum cooling trap for use in a vacuum chamber comprising: a laminated structure comprised of a pair of plates bonded together in face-to-face contacting relation, the plates being composed of metal of high thermal conductivity, and the plates having aligned confronting conduit portions which jointly define a conduit within the laminated structure for circulating a cooling medium through the laminated structure during use of the vacuum cooling trap.

Abstract: An ion pump comprises a pump casing inserted in a magnetic field, with an anode supported by insulators in the pump casing. Both the pump casing and anode are made of alminum-based metals, and the pump casing serves also as a cathode, thereby the ion pump has a simpler structure and functions more efficiently than the conventional ones.

Abstract: A process for producing a hollow aluminum extrudate for use in a vacuum comprising the steps of hermetically closing the forward open end of a hollow shaped material immediately after extrusion, subsequently extruding a predetermined length of shaped material, cutting off the predetermined length of extruded material and hermetically closing the cut end thereof at the same time, and cutting off the closed ends. During extrusion, the inner surface of the hollow portion of the shaped material is substantially held out of contact with the atmosphere to inhibit a hydrous oxide on the inner surface while permitting formation of a compact oxide film thereon.

Abstract: A seal device for a gate valve is disclosed, in which annular members facing the front and rear surfaces of a gate valve member having a through hole are coupled to a valve cage by inner and outer bellows, each of the annular members has an annular recess formed on the side facing the gate valve member and closed by an annular mirror surface finished thin plate secured by welding to an opening thereof, the individual bellows are elongated by fluid under pressure supplied into annular spaces defined by the inner and outer bellows, and the annular mirror surface finished thin plates are strongly urged against the gate valve member by the pressure of the fluid forced from the annular spaces into the annular recesses. Edge portions of the annular mirror surface finished thin plates are to be very firmly mounted to the annular members, and the mechanical strength of the thin plates is to be increased.

Abstract: A shield-type coaxial vacuum feedthrough for connecting an external wire to lectric equipment inside a vacuum vessel, comprising a metal pin in the shape of a metal round bar, a ceramic cylinder enclosing the metal pin and a metal cylinder enclosing the ceramic cylinder, with the ceramic cylinder being partly enlarged in diameter so as to peripherally contact and fix itself to the metal cylinder, and the metal pin being reduced in diameter in that part corresponding to the enlarged part of the ceramic cylinder. Thereby, the matching of characteristic impedance can be secured even in the high-frequency region such as microwaves thereby allowing high-accuracy experiments and insuring strong endurance during the baking of the vacuum vessel.

Abstract: A bakable multi-pins vacuum feedthrough suitable for providing electrical connection from outside into a vacuum vessel of a synchrotron, comprising a metal cylinder and a disc-shaped ceramic pin-holder having multi-pins, wherein the pin-holder is sealingly fixed inside the cylinder at a place axially nonidentical with where the pin-holer and the multi-pins are sealingly fixed, so that favorable resistibility against high vacuum, baking, and strong radioactive rays is attained.