Abstract: An electromagnetic relay having an electromagnetic block with a roughly U-shaped iron core formed with a pair of bent opposing magnetic poles at both the ends thereof and with a coil wound therearound via a spool; and an armature block with both ends thereof opposing the magnetic poles and with the middle portion thereof pivotally supported. A permanent magnet is disposed between the two opposing magnet poles of the iron core so as to oppose said armature. The permanent magnet is supported by a support member formed integral with the spool of the electromagnetic block. The armature is pivotally supported by the electromagnetic block.

Abstract: An electric switch for a power tool, comprising: a slider slidably received in a switch casing along a longitudinal direction, a handle provided in the grip of the power tool for manually actuating the slider along the longitudinal direction; a plurality of fixed contact pieces arranged in an internal bottom surface of the switch casing and provided with contact surfaces located substantially in a same plane; and a plurality of moveable contact pieces arranged in the bottom surface of the slider and urged toward the fixed contact pieces by spring members so as to selectively contact at least some of the contact surfaces of the fixed contact pieces. The contact portions of this switch achieve various conductive states by planar arrangement and movement of the contact pieces, the component parts can be fitted into a small switch casing, particularly having a small height.

Abstract: A microswitch in which a good snap action feeling is obtained and an operating stroke is large is provided. Included in the microswitch is a swingable lever which is pushed by a pressing projection of a push button swingably pivotally supported. One end of the lever is pivotally supported and the other end is coupled with one end of a movable member having a movable contact. The movable member is biased by a spring in one direction.

Abstract: An electromagnetic relay having an electromagnetic block with a roughly U-shaped iron core formed with a pair of bent opposing magnetic poles at both the ends thereof and with a coil wound therearound via a spool; and an armature block with both ends thereof opposing the magnetic poles and with the middle portion thereof pivotally supported. A permanent magnet is disposed between the two opposing magnet poles of the iron core so as to oppose said armature. The permanent magnet is supported by a support member formed integral with the spool of the electromagnetic block. The armature is pivotally supported by the electromagnetic block.

Abstract: A microswitch in which a good snap action feeling is obtained and an operating stroke is enhanced is provided. A compession spring is interposed between a movable member and a swingable lever which are respectively pivotaly supported at close positions. The swingable lever is operated by a push button which is vertically slidable. Further, restricting plates to restrict the motion in the width direction of the movable member are attached to the push button. A positioning member to hold the swingably lever to the position which faces the push button when the microswitch is assembled is also provided.

Abstract: An electromagnetic relay having an electromagnetic block with a roughly U-shaped iron core formed with a pair of bent opposing magnetic poles at both the ends thereof and with a coil wound therearound via a spool; and an armature block with both ends thereof opposing the magnetic poles and with the middle portion thereof pivotally supported. A permanent magnet is disposed between the two opposing magnet poles of the iron core so as to oppose said armature. The permanent magnet is supported by a support member formed integral with the spool of the electromagnetic block. The armature is pivotally supported by the electromagnetic block.

Abstract: A polarized relay with an electromagnetic drive comprises an electromagnetic yoke composed of a core wound with a coil and a yoke body, and having one end portion of one magnetic polarity and a pair of bifurcated end portions of the other magnetic polarity opposite to the one magnetic polarity. The bifurcated end portions are separated in opposition from each other. The one end portion of the yoke is disposed between the bifurcated end portions so as to cooperate to form a pair of working gaps. A movable block of a substantially C-like configuration incorporating a permanent magnet has two magnetic pole pieces which are disposed within the working gaps, respectively. Guide is provided for guiding the movable block in response to energization and deenergization of the coil so that the pole pieces are movable within the respective working gaps. A contact mechanism including movable contacts is mechanically coupled to the movable block to make or break circuit.

Abstract: An electromagnetic relay includes a moving block assembly which is selectively attracted by the energization of the electromagnet in the relay and moves in a direction perpendicular to the axis of an iron core within the electromagnet, thus actuating a movable contact support. The moving block and the movable contact support slide together, thus preventing wobbling of the movable block assembly within the relay.

Abstract: This electromagnetic relay includes: a base assembly; an electromagnetic block assembly, mounted to the base, including an iron core and an electromagnetic coil wound around the core; a movable block assembly, which is selectively attracted by the electromagnetic block assembly according to energization of the electromagnetic coil thereof, and is movable along a direction perpendicular to the axial line of the iron core; a contact mechanism including a movable contact support member actuated by the movement of the movable block assembly, a movable contact mounted to the movable contact support member near one extremity thereof, a fixed terminal member supporting the movable contact support member from the base assembly near another extremity thereof, a fixed contact support member mounted to the base assembly opposing the movable contact support member, and a fixed contact mounted to the fixed contact support member opposing the movable contact; a means for guiding the movable block assembly along the aforesa

Abstract: A polarized electromagnetic relay apparatus for assembling a coil spool with a terminal carrying base plate is disclosed. The coil spool assembly has a front collar with a projecting piece. The projecting piece is adapted to engage with a latch hole in the terminal carrying base plate. The terminal carrying base plate has jaw-like, offset portions which engage with supporting offset portions formed in the rear collar of the coil spool assembly. The flexible projecting pieces may be of deformable material in order to easily engage with the latch hole of the base plate. The flexible projecting pieces can be tapered, also to facilitate engagement with the base plate latch hole. A terminal holder is formed on the rear collar of the coil spool assembly and is adapted to receive terminals from the coil. The terminal holder comprises the supporting offset portions which engage with the jaw-like offset portions of the base plate. The terminal holder is of a greater thickness than the base plate.

Abstract: A molding method and apparatus in which an insert part is supported in a mold cavity by a pin. The pin is withdrawn when the resin pressure in the mold exceeds a predetermined value.

Abstract: Ultrathin membranes for separating substances are obtained by exposing shaped articles comprising a water-soluble polymer or a mixture of a water-soluble polymer and water-insoluble polymer to a plasma of a gas selected from helium, argon, nitrogen, hydrogen, oxygen, carbon monoxide, carbon dioxide, ammonia, a hydrocarbon having 1 to 10 carbon atoms, an epoxide having 2 to 10 carbon atoms, or an alkylamine, or a mixture of these substances to crosslink the surface layer, and then washing the exposed articles with water to remove the unreacted portions. The membrane exhibits outstanding performance characteristics when used in the processes for separating or concentrating substances, such as reverse osmosis, ultrafiltration, and the like.

Abstract: An improved process for producing a photo-curable composite material using a liquid photo-curable resin, which comprises holding a liquid photo-curable resin with a screen material between two films, at least one of the films having photo-transmitting properties, and passing the films holding the liquid photo-curable resin and the screen material through a gap (e.g. between two rollers). The process of the present invention can produce photo-curable composite materials useful for preparing various stencils for screen printing, textile printing, or the like at a low cost and with less production of defects.

Abstract: Relieved pattern of a resin original pattern plate, which does not exhibit fluidity at transferring temperature and possesses elastic modulus no smaller than 10 kg/cm.sup.2, preferably no smaller than 100 kg/cm.sup.2, is transferred onto thermoplastic resin material having fluidity at the transferring temperature (ASTM D1238, load 21.6 kg) of at least 0.01 dg/min, preferably at least 0.1 dg/min, by pressing the thermoplastic resin material to the original pattern plate under a pressure condition where elastic deformation of the original pattern plate is kept within 10%. The resin original pattern plate is prepared by controlling the photo-polymerizable resin composition to adjust its crosslink-ability and then photo-polymerizing, whereby the resulting resin original pattern plate possesses an elastic modulus of 10 kg/cm.sup.2 or higher at transferring temperature.

Abstract: A photo-curable composite material used for preparing various stencils for screen printing, textile printing or the like, which comprises a flat, flexible and photo-transmitting thin film (A); a flat and flexible film (B); a liquid photo-curable resin and a flat screen material, said films (A) and (B) being air-tightly bonded to each other at the peripheral portion thereof to form a flat inner space therein, said liquid resin being filled in said inner space to form a layer and said screen material also being placed in the inner space substantially in parallel with the inner walls of the films (A) and (B).

Abstract: A method for the preparation of a semipermeable membrane which comprises exposing porous shaped articles of polyacrylonitrile or copolymers thereof containing acrylonitrile in an amount of more than 40% by mole to a plasma.The resulting semipermeable membrane is very useful for separating substances by reverse osmosis or ultrafiltration.

Abstract: A process for improving the performances of semipermeable membranes which comprise an acrylonitrile polymer containing 40 to 100% by mole of acrylonitrile and have a bubble point of more than 0.1 kg/cm.sup.2, by dipping said membranes in an aqueous solution containing inorganic salts and/or protic acids.

Abstract: A method for the preparation of semipermeable membranes which comprises sulfonating porous membranes of acrylonitrile polymers containing acrylonitrile in an amount of 40% to 100% by mole.The resulting semipermeable membrane is very useful for separating substances by reverse osmosis or ultrafiltration.

Abstract: An original pattern plate obtained by the use of a photo-sensitive resin composition comprising:(A) an unsaturated polyester having an acid value of from 10 to 40 and having not less than 50% by mole of unsaturated acids in the acid component,(B) a photo-polymerizable, ethylenically unsaturated compound which essentially contains a compound having a photo-polymerizable, ethylenically unsaturated linkage and at least one hydroxyl group,(C) a melamine compound of the formula:(C.sub.3 H.sub.6-(m+n) N.sub.6)(CH.sub.2 OH).sub.m (CH.sub.2 OR).sub.nwherein R is an alkyl group having 1 to 4 carbon atoms, m is from 0 to 6, n is from 0 to 6 and m+n is from 1.5 to 6, or its condensate having an average condensation degree of not more than 4,(D) a photo-polymerization initiator, and(E) a thermal polymerization inhibitor,the weight proportion of the components (A), (B) and (C) satisfying the relationships of the following equations: 1/5.ltoreq.B/(A+B).ltoreq.3/5 and 1/50.ltoreq.C/(A+B+C).ltoreq.

Abstract: A process for the polymerization of olefins in the presence of a catalyst comprising a titanium compound and/or vanadium compound supported on a solid carrier and an organoaluminum compound, characterized in that said solid carrier comprises a solid product obtained by the reaction of an organomagnesium compound or a reaction mixture resulting from the organomagnesium compound and at least one compound selected from the group consisting of magnesium hydroxide, calcium hydroxide, zinc hydroxide and aluminum hydroxide, with an aluminum halogenide and/or silicon halogenide, whereby there are produced olefine polymers in an extremely large amount per unit weight of catalyst.