Abstract: This optical connector with a shutter is for blocking emitted light from the connected optical connector, such as an optical connector adaptor, provided in a connector hole of a connector housing by using a shutter. In this optical connector with a shutter, the shutter unit is assembled in the center part of the connector housing, and the emitted light in the connector hole from the connected optical connector is blocked by shutter pieces of the shutter unit. Furthermore, an electromagnetic shielding capacity can be obtained without enlarging the optical connector by making the shutter unit from electrically conducting members.

Abstract: The present invention provides an optical connector cleaning instrument that enables cleaning of the front end of an optical connector with efficiency and certainty, and prevents excessive cleaning. The present invention further provides an optical connector cleaning method employing the aforementioned optical connector cleaning instrument. The optical connector cleaning instrument is provided with cleaning member for coming into contact with and cleaning the front end of the optical connector; a driver for driving the cleaning action of the cleaning member; and a switch for initiating the driving action of the driver.

Abstract: The present invention is applied to a structure in which to attach a backplane connector to a backplane so that the backplane connector can be moved by a desired amount, a clip from which a pair of elastic pawls project is used to engage the backplane with the backplane connector through holes in the backplane. The present invention allows the clip of this structure to be removed efficiently. That is, the present invention provides a clip removing tool 50 comprising disengaging pieces 52a and 52b that push in a pair of elastic pawls 29b through an attaching slot 31 in a backplane 23, the elastic pawls 29b being engaged with locking portions 34 on opposite side portions of a BH housing 26 are pushed, to disengage the elastic pawls 29b from the locking portions 34, as well as a clip removing method using this clip removing tool.

Abstract: The present invention relates to a technique for intercepting light which is emitted from a connection reception side optical connector which is housed inside a connector hole of a connector housing of a device such as an optical connector adapter or the like using a shutter, and more particularly relates to a development of this technology which makes it possible to arrange the shutter without exerting the negative effect of increasing the size of the connector housing. With the present invention such light interception is implemented, without increasing the size of the connector housing 14, by providing a structure in which a shutter unit is fitted within a connector hole 14a of a connector housing 14, with this shutter unit comprising two shutter leaves 53A and 53B for light interception supported upon shafts in a main section 51 of the assembly.

Abstract: An optical connector that provides a housing body 21 and a fixed part 22 that are installed so as to hold a backplane 3, and connects an optical connector plug 4b inserted into said housing body 21 via an installation hole in said backplane 3 and another optical connector plug 4a inserted into said housing body 21 from the direction opposite to that of said optical connector plug 4b, wherein flexible claws 25 projecting from both sides of said fixed part 22 engage said housing body 21 via said installation hole 30 in said backplane 3, and thereby said backplane 3 is held between said housing body 21 and said fixed part 22. Simply by adjusting the floating range (amount of floating) of the flexible claws 25 within said installation hole 30 the floating range (amount of floating) of the housing body 21 can be reliably set.

Abstract: A join end face of an optical connector is easily and reliably cleaned when the optical connector has been inserted into a connector housing, by using an optical connector cleaning unit comprising a cleaning member which wipes clean a join end face of an optical connector inside a connector housing by relative motion against the join end face, a drive mechanism which drives the cleaning member, and a connection section which enables a drive auxiliary mechanism for applying a moving force to the drive mechanism to be connected, and an optical connector cleaning tool in which a drive auxiliary unit comprising the drive auxiliary mechanism has been connected to the connection section of the optical connector cleaning unit.

Abstract: An optical connector cleaning tool, which can easily and reliably clean a connecting end face of an optical connector while the optical connector is disposed in a connector housing, is disclosed. The optical connector cleaning tool comprises a tool body, and an insertion portion which is provided so as to project from the tool body, and which is adapted to be inserted into the connector housing, and the optical connector cleaning tool is adapted such that the cleaning element disposed at an end of the insertion portion projecting from the tool body is positioned and abutted against the connecting end face when the insertion portion is inserted into the connector housing. It is easy to insert the cleaning element into the connector housing and to abut the cleaning element against the connecting end face. Furthermore, it is easy to maintain the cleaning element in position abutting against the connecting end face when the cleaning element is moved for wiping the connecting end face.

Abstract: This optical connector with a shutter is for blocking emitted light from the connected optical connector, such as an optical connector adaptor, provided in a connector hole of a connector housing by using a shutter. In this optical connector with a shutter, the shutter unit is assembled in the center part of the connector housing, and the emitted light in the connector hole from the connected optical connector is blocked by shutter pieces of the shutter unit. Furthermore, an electromagnetic shielding capacity can be obtained without enlarging the optical connector by making the shutter unit from electrically conducting members.

Abstract: The present invention is applied to a structure in which to attach a backplane connector to a backplane so that the backplane connector can be moved by a desired amount, a clip from which a pair of elastic pawls project is used to engage the backplane with the backplane connector through holes in the backplane. The present invention allows the clip of this structure to be removed efficiently. That is, the present invention provides a clip removing tool 50 comprising disengaging pieces 52a and 52b that push in a pair of elastic pawls 29b through an attaching slot 31 in a backplane 23, the elastic pawls 29b being engaged with locking portions 34 on opposite side portions of a BH housing 26 are pushed, to disengage the elastic pawls 29b from the locking portions 34, as well as a clip removing method using this clip removing tool.

Abstract: The present invention provides an optical connector cleaning instrument that enables cleaning of the front end of an optical connector with efficiency and certainty, and prevents excessive cleaning. The present invention further provides an optical connector cleaning method employing the aforementioned optical connector cleaning instrument. The optical connector cleaning instrument is provided with cleaning member for coming into contact with and cleaning the front end of the optical connector; a driver for driving the cleaning action of the cleaning member; and a switch for initiating the driving action of the driver.

Abstract: An optical connector that provides a housing body 21 and a fixed part 22 that are installed so as to hold a backplane 3, and connects an optical connector plug 4b inserted into said housing body 21 via an installation hole in backplane 3 and another optical connector plug 4a inserted into said housing body 21 from the direction opposite to that of fixed part 22 engage said housing body 21 via said installation hole 30 in said backplane 3, and thereby said backplane 3 is held between said housing body 21 and said fixed part 22. Simply by adjusting the floating range (amount of floating) of the flexible claws 25 within said installation hole 30 the floating range (amount of floating) of the housing body 21 can be reliably set. Thereby, when the housing body 21 engages the printed board housing, the dimensional error is offset reliably by the floating of the housing body 21, and the engagement is carried out smoothly.

Abstract: There is disclosed a muffler structure in which a valve opened/closed in accordance with exhaust gas pressure in a pipe is prevented from chattering by an inlet pipe provided with a first side hole and an outlet pipe provided with a second side hole with a valve biased by a spring to simultaneously close both the first and second side holes when the pressure is relatively low. When the pressure of the exhaust gas is relatively high, the pressure exerted on the valve by the exhaust gas in the inlet pipe is sufficient to open the valve and the exhaust gas introduced to the inlet pipe flows out to a second chamber via the first side hole, flows into the outlet pipe via the second side hole, and is exhausted to the outside of the muffler via the downstream outlet opening.

Abstract: In a muffler for internal combustion engine which is provided with a valve capable of closing and opening an open end of by-pass inner pipe, the opening and closing operation of the valve is performed via the exhaust gas pressure, without being affected by external factors. Also, the structure is simple and easy to be assembled. On a fixed shaft (36) supported in the vicinity of an open end (28a) of a by-pass inner pipe (28) is a valve (32) rotatably mounted. The valve (32) is urged against the open end (28a) by a coil spring (42), and when fitted in a flange part (38), it closes the open end (28a). When the revolving speed of the internal combustion engine is low, the pressure inside the by-pass inner pipe (28) is smaller than the operative force which is an addition of the urging force by the coil spring (42) and the external pressure. The open end (28a) is therefore closed.

Abstract: The present invention relates to a molten steel refining method for refining molten steel, the carbon content of which is not more than 0.1 weight %, by blowing oxygen gas for decarburization at a blowing speed so that a cavity, the depth of which is 150 to 400 mm, can be formed on the surface of molten steel in a straight barrel type vacuum refining apparatus in which a straight barrel type vacuum vessel having no vessel bottom and a ladle are arranged.

Abstract: In a muffler for an internal combustion engine which is provided with a valve capable of closing and opening an open end of a by-pass inner pipe, the opening and closing operation of the valve is performed by means of the exhaust gas pressure, without being affected by external factors. Also, the structure is simple and easy to be assembled. On a fixed shaft (36) supported proximate an open end (28a) of a by-pass inner pipe (28) is a valve (32), rotatably mounted. The valve (32) is urged against the open end (28a) by a coil spring (42), and when fitted in a flange part (38), it closes the open end (28a). When the revolving speed of internal combustion engine is low, the pressure inside the by-pass inner pipe (28) is smaller than the operative force which is an addition of the urging force by the coil spring (42) and the external pressure. The open end (28a) is therefore closed.

Abstract: In a chlorine hydrate tank wherein a chlorine gas supply pipe is inserted into a tank holding chilled water therein and chlorine gas in blown into the water through the pipe to form a chlorine hydrate, a hollow cylinder having an opening in an upper-side portion thereof is arranged around the chlorine gas supply pipe so as to form a predetermined gap therebetween so that the upper opening of the cylinder is partially or entirely submerged in the water.

Abstract: In a battery having a cathode in which a halogen is employed as an active material, the halogen is dissolved in an organic solvent such as a halogenated hydrocarbon, whereby the halogen is stored, and is utilized when needed. This battery can be applied as both a primary battery and a secondary battery. According to the battery of the present invention, a power required during the operation of the battery is reduced, whereby the total energy efficiency of the battery can be improved.

Abstract: In a zinc-chloride cell of the invention, the gas phase in a cell container comprises a gas mixture of chlorine gas and an inert gas to allow easy control of the internal pressure of the cell during cell operation. During charging of the cell, the gas mixture is trapped, and the trapped gas mixture is blown into the electrolyte so as to reduce the chlorine concentration in the electrolyte.

Abstract: A zinc-halogen battery having a negative electrode of zinc electrode, a positive electrode of halogen electrode, and an electrolyte of aqueous solution containing a zinc halide as a main component thereof, which is characterized in that said electrolyte contains Tl and/or Tl compound and further at least one additive selected from the group consisting of Mo, W, Sn, Pb, Bi and the compounds thereof, if necessary, with addition of In and/or In compound.

Abstract: A galvanic cell separator composed of polyvinyl alcohol having a crystallinity of 0.4 or more to be used with a galvanic cell containing alkaline electrolyte, and a method of manufacturing the same.