Abstract: A process and apparatus assuring low costs and high efficiency in practicing refuse incineration. A applying electromagnetic wave of a frequency band resonant with rotation or vibration of a specific substance e.g., dioxins molecule, thereby to heat the dioxins molecule selectively up to high temperature to remove the dioxins molecule by decomposition.

Abstract: A method of improving the temperature control of a clamped substrate mounted on a substrate support that is biased, the substrate support having a passage therethrough to permit a flow of backside gas for heating or cooling the substrate, whereby the pressure of the backside gas is maintained at at least 15 torr. A high gas pressure improves the thickness uniformity of processing across the substrate. For plasma deposition of sputtered seed layers, the morphology of the seed layer is improved near the edge of the substrate and the uniformity of the layer across the substrate is also improved.

Abstract: A water treatment tank for treating waste water using an electrochemical treatment process. The electrochemical process removes both suspended and dissolved solids in the water and allows the treated water to be removed from the tank for reuse or discharge. The tank includes a tank housing with first and second waste water receiving compartments. The two compartments are identical and are used alternately when treating the waste water. A waste water inlet line is attached to the top of the first compartment for filling the compartment with waste water. A side of the first compartment includes an annular opening for receiving an electrode assembly with a plurality of electrodes extending inside the compartment for treating the waste water electrochemically. The electrodes are attached to the power supply via electrode cables with the polarity of a current cycle reversed periodically depending on the types of water contaminates being treated.

Abstract: A cathode arrangement having a mounting rail (1) and a cathode plate (2) bonded to the mounting rail (1). Two parallel flanges extending in its longitudinal direction are formed on the underside (5) of the mounting rail (1). The cathode plate (2) is accommodated and bonded to the flanges (8, 9) by explosion welding between the parallel flanges. A full-surface metal-to-metal bond is thus obtained, which has very good current-conducting properties at the contact surfaces between the flanges (8, 9) and the cathode plate (2). The ends of the mounting rail (1) projecting over the cathode plate (2) have a flangeless design and have oblique surfaces (6, 7) intersecting in the shape of a wedge on the underside.

Abstract: A nitrogen oxide gas sensor wherein an alloy electrode of platinum and rhodium or a cermet electrode of platinum, rhodium, and zirconia or of a rhodium alloy and zirconia is used as the gas sensing electrode. The electrode of the sensor is suitable for measuring nitrogen oxide such as NO and NO2 in an exhaust gas.

Abstract: A gas sensor includes a sensor element formed of a solid electrolyte having an oxygen ion conductivity; a cathode and an anode, each formed of a porous metal material and each formed on the sensor element, to produce a pumping current reflecting a concentration of a detection component in a measurement gas when a predetermined voltage is applied between the cathode and the anode. The detection component contains oxygen. The measurement gas contacts the cathode. The gas sensor also includes a gas diffusion control to vary the oxygen pumping current in accordance with a pressure of the measurement gas by controlling a diffusion of the measurement gas. The measurement gas moves from a measurement atmosphere toward the cathode by way of the gas diffusion control. Thereby, information on the pressure of the measurement gas is obtained based on the oxygen pumping current.

Abstract: In order to raise accuracy of measurement, a compound layered type of sensing device is provided. The device comprises a plurality of solid electrolyte plates and first to third electrochemical cells. Each cell has a single pair of electrodes disposed on the solid electrolyte plates. A concentration of a gas specified from a gas to be measured pre-processed based on oxygen pumping by the first electrochemical cell is detected by the second electrochemical cell. A difference in electromotive force between the gas to be measured and a reference gas is detected by the third electrochemical cell. The single pair of electrodes of the third electrochemical cell is disposed on the same surface of one of the solid electrolyte plates, and both of the first and third electrochemical cells are located with different ones of the solid electrolyte plates.

Abstract: An objective gas to be measured is introduced into first and second chambers which are connected via a diffusion resistive passage. A first electrochemical cell is provided in the first chamber for pumping in and out oxygen in accordance with an applied voltage. A second electrochemical cell is provided in the second chamber and responsive to application of a predetermined voltage for generating a sensor current representing a specific gas concentration in the objective gas. The first electrochemical cell is located between the first chamber and a reference gas chamber so that oxygen pumping in and out operation can be performed between the first chamber and the reference gas chamber.

Abstract: The invention relates to a polymeric electrolyte which is part of an electrochemical reference electrode and which is used in potentiometric and amperometric sensors. The polymeric electrolyte is a hydrogel which is stable in a large pH-range and stable against organic solvents.

Abstract: The present invention provides methods for separating a compound, including a membrane polypeptide. The method includes the use of a bicontinuous lipidic phase. The invention also provides devices that include a bicontinuous lipidic cubic phase, and a kit for use in separating a compound, including a mixture that includes a lipid and an aqueous phase and instructions for using the mixture.

Abstract: A microfabricated capillary array electrophoresis chip includes a planar substrate having a first major surface defining converging first and second elongate separation channels. Each separation channel extends between an associated cathode port and anode port defined by the first major surface. The substrate further comprises a first perimetrical edge segment extending substantially along the first separation channel, and a second perimetrical edge segment extending substantially along the second separation channel. The perimetrical edge segments of a pair of chips of the present invention are cooperatively engageable so as to provide an electrophoresis separation plate having psuedoradially-aligned separation channels.

Abstract: In a method for controlling sample introduction in microcolumn separation techniques, more particularly in capillary electrophoresis (CE), where a sample is injected as a sample plug into a sampling device which comprises at least a channel for the electrolyte buffer and a supply and drain channel for the sample. The supply and drain channels discharge into the electolyte channel at respective supply and drain ports. The distance between the supply port and the drain port geometrically defines a sample volume. The injection of the sample plug into the electrolyte channel is accomplished electrokinetically by applying an electric field across the supply and drain channels for a time at least long enough that the sample component having the lowest electrophoretic mobility is contained within the geometrically defined volume. The supply and drain channels each are inclined to the electrolyte channel. Means are provided for electrokinetically injecting the sample into the sample volume.

Abstract: An image is reproduced and transferred onto a substrate by (a) providing a positive electrode having a continuous passivated surface moving at constant speed; (b) forming on the positive electrode surface dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of a colloid present in an electrocoagulation printing ink; and (c) bringing a substrate into contact with the dots of colloid to cause transfer of same onto the substrate. Step (b) is carried out by providing a series of negative electrodes having passivated surfaces spaced from the positive electrode surface by a constant gap; coating the positive electrode surface with an olefin; filling the electrode gap with the ink; applying to the negative electrodes a pulsed bias voltage; and applying to selected ones of the negative electrodes a trigger voltage sufficient to cause point-by-point selective coagulation and adherence of the colloid onto the olefin-coated positive electrode surface.

Abstract: A heat treatment apparatus permits manufacture of a high-accuracy resist pattern by reducing a temperature difference within a substrate surface in the transition state of heating or cooling the substrate and the steady state. The heat treatment apparatus includes a thermal plate having a main surface containing a first area on which the substrate is to be placed and a second area surrounding the first area, heat capacity per unit area in the second area of the main surface being smaller than heat capacity per unit area in the first area of the main surface; and a temperature control element for controlling temperature of the thermal plate in accordance with supplied current.

Abstract: A method of coating a metal surface, particularly an inner surface of a gun barrel, with a chromium layer, includes the following steps: electrolytically precipitating on the metal surface a plurality of partial chromium layers in a superposed relationship by electric current pulses equaling the number of the partial chromium layers; and selecting the duration of each pulse such that a crystallite growth of individual partial chromium layers is stopped prior to a natural termination thereof for obtaining a globular polytropic structure of the entire chromium layer.

Abstract: Nitride layer formation includes a method wherein a material is electrodeposited on a substrate and converted, at least in part, to a layer comprising nitrogen and the electrodeposited material. The electrodepositing may occur substantially selective on a conductive portion of the substrate. Also, the converting may comprise exposing the electrodeposited material to a nitrogen-comprising plasma. Chromium nitride and chromium oxynitride are examples of nitrogen-comprising materials. Copper or gold wiring of an integrated circuit are examples of a substrate. The processing temperature during the electrodepositing and the converting may be selected not to exceed 500° C. The thickness and composition of the nitride layer may be effective to limit diffusion of the wiring through the nitride layer. A diffusion barrier forming method may include forming a patterned layer of integrated circuit copper wiring over a substrate.

Abstract: In order to prepare tetramethylammonium hydroxide by electrolysis of a tetramethylammonium salt in a cell with a cation-exchange membrane, the operation is carried out continuously under stationary conditions obtained, on the one hand, by the introduction, into the anode electrolysis loop, of a tetramethylammonium salt solution which is more concentrated than that present in the cell and by an input of water into the cathode loop and, on the other hand, by the withdrawal of a portion of each of the solutions circulating in the anode and cathode loops.

Abstract: In a process for producing an aluminum support of a lithographic printing plate, the desired aluminum support is produced by imparting fine asperities to an aluminum plate and then roughening it electrochemically in an acidic aqueous solution. The roughened aluminum plate may be electropolished or chemically etched.

Abstract: This invention relates to a single-piece carrier for unitizing a plurality of containers with a retainer sheet integrated with a film sleeve. The retainer sheet may comprise a thicker material than the film sleeve. The retainer sheet comprises a plurality of container receiving openings for engaging a top portion of each container while the film sleeve surrounds the plurality of containers. Packages may comprise one or more layers of containers within the film sleeve.

Abstract: A notepad having rectangular leaves each having a self-adhesive marginal edge portion adhered to an underlying leaf, and a free edge opposite from the marginal edge portion, is provided in a notepad holder having a rectangular pad support surface, a pair of opposed side walls extending at right angles to the pad support surface at opposite sides of the pad support surface and an abutment for the marginal edge portions. Resilient material secured to the side walls, is in contact with and compressed by opposite sides of the notepad. At least the lowermost one of the leaves folded to form a strip-shaped bulge and a plastic strip is inserted into the bulge to increase the retention of the notepad.

Abstract: A golf club organizing assembly for a golf club carrying bag includes a plurality of dividers. Some of the dividers extend in intersecting transverse relationships with other of the dividers so as to form a plurality of compartments therebetween for receiving shafts of golf clubs placed in a carrying bag. Also, some dividers are of colors different from and contrasting with colors of other dividers so as to provide contrasting colors about the compartments which improve visibility of compartments to a golfer over a case where all of the dividers are of the same color.

Abstract: The invention relates to a pouch or bag (1) of a heat shrinkable gas-barrier, thermoplastic film for packaging one or a plurality of items, said pouch or bag comprising a closed bottom (2), two closed side edges (3) and (4) and an open mouth (5) for the introduction of the items to be packaged, said pouch or bag being characterized in that it comprises a seal (6) along a line, in-between the bottom (2) and the mouth (5), connecting the two side edges (3) and (4), said seal (6) defining with the closed bottom (2) and part of the side edges (3′) and (4′) a closed, airtight area (7) and in that it further comprises another seal (8) extending from the closed bottom (2) toward the closed, airtight area (7) and a precut (9) made in the area delimited by the bottom (2) and the seal (8).

Abstract: The packaging consists of a box-like body with a sleeve-like portion. The sleeve-like portion is essentially of rectangular construction and has a fold-back lid at one end and is provided with an opening at the other end. That is to say, the packaging does not have a base, The assembly consists of the packaging described above and a container to be accommodated therein, the dimensions of container and packaging being matched to one another in such a way that mutual engagement takes place.

Abstract: A wafer case for holding a wafer includes a case body having an opening for receiving the waver, and a lid for closing said opening of the case body. The case body and lid are made of dust-free paper. Further, the case body has a lid fitting portion, over which said lid fits; and a plurality of through holes are formed in the lid fitting portion at equal interval.

Abstract: The invention relates to a process for maintaining heat balance in a fluidized bed catalytic cracking unit. More specifically, the invention relates to a combustion control method capable of maintaining or restoring heat balance by conducting, under appropriate conditions, fuel and an oxygen-containing gas to a transfer line. The transfer line conducts effluent including spent catalyst and combustion products to the unit's catalyst regeneration zone.

Abstract: In a method of removing acidic compounds, color, and polynuclear aromatic hydrocarbons, and for removing or converting hydrocarbons containing heteroatoms from petroleum distillates, phase transfer catalyst is employed to facilitate the transfer of inorganic or organic bases to the substrate of the distillate. An inorganic or organic base, a phase transfer catalyst selected from the group including quaternary ammonium salts, polyol ethers and crown ethers, and used oil distillate are mixed and heated. Thereafter, contaminants are removed from the used oil distillate through distillation. A solvent is then mixed with the resulting distillate to extract contaminants therefrom. The solvent is recovered and distilled to separate the contaminants therefrom, and is then reused. The petroleum distillate having the contaminants separated therefrom is also distilled to remove any remaining solvent therefrom, with the recovered solvent being reused.

Abstract: A device and process for aerating dispersions, particularly for flotation of pulp suspensions, in a de-inking process where the pulp suspension containing dirt particles is sprayed into a tank together with air. The air is injected at a minimum of two successive points and mixed with the suspension.

Abstract: A vibrating screen apparatus for sizing materials is shown that has a minimum of moving parts therein. A vibrating motor is mounted below longitudinal vibrating bars. The vibrating bars are set on air mounts, which air mounts are between the vibrating bars and cross braces connected to the frame. The vibrating bars press against the underside of a vibrating screen to form a crown therein when the air mounts are inflated. The vibrating screen is stretched between the sides of the frame by tensioning rails. A shroud over the top of the frame is secured in place. Multiple size materials can be produced by stacking multiple vibrating screen apparatuses.

Abstract: An operation portion reads an analyzing time and an analyzing flow rate from a storing portion for a next analysis to calculate a liquid delivery quantity per analysis for the next analysis, and transmits the liquid delivery quantity per analysis to a comparison portion. The comparison portion compares a pump capacity and the liquid delivery quantity per analysis, and when the comparison portion determines that the pump capacity is larger than the liquid delivery quantity per analysis, a control portion allows a mobile phase in the next analysis to be delivered by only one cycle discharging operation in a low flow rate mode. Thus, in a micro-liquid chromatography, influence of a pulsating flow can be suppressed.

Abstract: An apparatus for the separation of immiscible liquids from liquid influent has a containment vessel. An influent channel discharges influent vertically upward against an upwardly divergent plate. This causes the influent to move radially outward, thus slowing the influent and facilitating gravitational separation of lighter immiscible liquids from the influent. As the separating liquids pass through a gap between the plate and the vessel to an upper region of the vessel, a hood funnels the separated lighter liquids to a collection zone. A transfer tube, a sensor, and a pump are provided to pump the lighter liquids out to a remote location. A pan in a lower portion of the vessel causes heavy solids to collect, and a suction conduit suctions the solids from the vessel. An effluent channel channels heavier liquids such as water from a central region of the vessel to a remote location, such as a sewer.

Abstract: A liquid filter, especially including an oil filter cartridge 12 which is contained in a pot-shaped or cylindrical housing 10 with threaded cover 11, into which a cooler 13 is preferably installed. An outlet opening 37a is contained in the oil cooler which facilitates complete emptying of the cooler when the filter is changed. In this way a complete replacement of the oil can be performed, so that the replaced oil is not contaminated from the outset by residues of the old oil. Thus, service intervals can be lengthened. To prevent a short circuit of the outlet opening 37a during operation, the opening is closed by a valve stem 33 coupled to the threaded cover and opened by unscrewing the cover.

Abstract: A device in connection with a separator (3) in a processing plant, for example a plant for processing a fluid consisting of oil, water, gas and possibly solid substances. The separator comprises a container or a chamber (7) with an inlet (1) for the fluid to be separated and two or more outlets for each of the respective separated phases. The fluid is designed to flow via a spiral duct (2) which extends from the inlet (1) down towards the base of the container (7). The container (7) may expediently be mainly cylindrical and vertical and the duct (2) extends along the periphery of the container.

Abstract: The rotary flat membrane disk is constructed in which circular membranes are stretched at both sides of a disk. The disk and the membrane are bonded to each other over the entire periphery by a peripheral bonding part, and they are also bonded to each other by a plurality of partial bonding parts arranged inside the peripheral bonding part. The partial bonding parts are formed like dots of 10 mm in diameter, and are arranged at every 30 degrees on circles of 500 mm and 600 mm in diameter.

Abstract: A filter element 10 for purifying fluids having a filter medium 11, an enclosure member 12, and a rod 13. The filter medium 11 has folds 14, which may be zigzag-shaped, and which define a fold height 15 and a pleat surface 16. At right angles to folds 14 extend end faces 17, which represent the course of the folds 14. The enclosure members 12 are arranged on the end faces 17. To support the folds 14, the rod 13 pierces through the pleat surfaces 16 of the folds 14 creating joints 19. These joints 19 are sealed, e.g., by additional seals or by fusing the filter medium to the support rod or the support rod to the filter medium.

Abstract: There can be obtained an ecological filtration apparatus providing a sufficient function of precise filtration while contributing to saving resources and minimizing refuse. The filtration apparatus includes a housing having an inlet and an outlet, an outer cylinder fixed to the housing, and a cartridge filter formed mainly of a cylindrical filter, an inner cylinder and end caps. The cartridge filter is detachably attached to the housing, housed in the outer cylinder, blocking a channel extending from the inlet to the outlet.

Abstract: A filter assembly for use in a press mould for moulding of cementitious products, the filter assembly including a fabric mounted in face to face contact with a support plate, perforated with a plurality of apertures arranged in a predetermined pattern to permit passage of fluid through the plate, the apertures defining imperforate zones there between, the fabric being knitted or woven to have a surface defined by a plurality of parallel ribs in face to face contact with the support plate, each pair of adjacent ribs defining therebetween opposed sides of a fluid channel which communicates with a number of said apertures and said imperforate zones, the ribs being knitted or woven to be sufficiently non-compressible in order to resist collapse of said fluid channels during compression of the cementitious product within said mould.

Abstract: A molecule separator device for isolating molecules having at least two separable properties and within a solution. The device includes a housing, and at least two molecule collection media disposed within the housing, whereby each such medium captures molecules exhibiting a respective property. In one embodiment, a first membrane captures only molecules with an ionic and/or hydrophobic and/or affinity attraction property while a second membrane captures only such molecules that additionally fall within a particular molecular weight range. A preferred housing is cylindrical for acceptance within a centrifuge, and is constructed of a plurality of releasably-connected compartments. The collection media is sequentially situated and centrifugation of the housing drives the solution through the media.

Abstract: A method of raising the concentration of a liquid mixture utilizes osmotic distillation to transfer a volatile liquid component from the mixture in contact with one side of a nonporous, preferably high free volume, gas permeable membrane to a strip solution in contact with the other side of the membrane. Due to its nonporous nature the gas permeable membrane resists penetration and wetting by oily components that may be present in the feed mixture. Similarly, occlusion of the membrane by solids is resisted. Preferably, an amorphous copolymer of perfluoro-2,2-dimethyl-1,3-dioxole is useful for the gas permeable membrane. Osmotic distillation utilizing such high free volume, nonporous gas permeable membranes can concentrate difficult liquid mixtures such as pulpy fruit juices and especially, limonene-containing juices, for example, orange juice. The process can be operated at high flux for long durations between membrane cleanings.

Abstract: A method for treating livestock wastewater includes directing screened wastewater to a hydrocyclone/separation tank system. The hydrocyclone directs the wastewater stream in a generally helical fashion to create bubble-particle aggregates. Activating chemicals can be added to the wastewater upstream of the hydrocyclone or within the hydrocyclone itself. The wastewater is channeled from an outlet of the hydrocyclone through a diffuser to a separation tank, where the bubble-particle aggregates are separated as they rise and accumulate on a free liquid surface of the tank. The treated wastewater settles below the bubble-particle aggregate accumulation and is transferred to a reservoir for later use as irrigation water or barn wash water. Salts may also be removed from the wastewater by filtering the wastewater through salt-removing filters before the wastewater is transferred to the reservoir.

Abstract: The present invention relates to an apparatus for putting into contact a defined quantity of treatment material with an aqueous solution to be treated. The apparatus comprises at least one medium permeable to the aqueous solution to be treated in which the treatment material is placed. The medium is made of polyester foam and has the form of a closed envelope. The treatment material present in the at least one medium is a material for trapping a compound to be eliminated from the solution.

Abstract: A support unit includes an outer panel intended to lie in a vertical plane when in use, the outer panel having a straight, horizontal lower edge. The support unit further includes an inner panel extending generally at right angles to the outer panel and connected thereto along a portion of the lower edge of the outer panel which is adjacent one end of that edge. The inner panel has structure defining a first horizontal contact plane on the upper side of the inner panel, and a second horizontal contact plane on the lower side of the inner panel. These two planes are substantially parallel. The preferred embodiment further includes a flange adjacent the mid-region of the outer panel and extending generally parallel with the two contact planes. In the preferred embodiment, the flange is flat and has a top surface which contains a hypothetical line extending at right angles to the outer panel.

Abstract: An adaptable retail merchandise product display system is particularly suited for display and storage of printed media in planar or roll form. The system includes display cassettes supported in tiers in a cabinet or rack; adjustable roll trays which accommodate rolled merchandise in various roll widths and also supported in tiers in a cabinet or rack; a fin to support merchandise displays and with integral storage compartments; and display spinners having a central vertical axis and radially extended attachment points between which display media extends in a concave form to maximize displayed surface area. The various aspects of the adaptable display can be combined in different arrangements according to the type of merchandise and the retail environment.

Abstract: A bottle holder to be used as packaging support device as well as storage and display furniture. The invention includes two panel members with four sides each and one of the side in each panel member includes at least one bay for receiving the body of a bottle. Elongated structural members are rigidly mounted panel members to keep the latter at a spaced apart and parallel relationship with respect to each other and to keep bays of the two panel in alignment relationships so the holder can be used to keep bottles vertically and separated inside a case in one position and horizontally in another position.

Abstract: The present invention discloses a three-dimensional helically-shaped display stand, and a stand and cake combination. Methods of manufacturing the same are also disclosed. From a base to an apex, a helically-shaped display rises. This helix can be cut from a single disc of material and can be supported in a variety of ways from a base.

Abstract: A semiconductor dry etching process that provides deep, smooth, and vertical etching of InP-based materials using a chlorinated plasma with the addition of nitrogen (N2) gas. Etching of InP-based semiconductors using an appropriate Cl2/N2 mixture without any additional gases provides improved surface morphology, anisotropy and etch rates.

Abstract: The power breaker is provided with at least one arcing chamber (2) which is filled with SF6 gas, is rotationally symmetrical, and extends along a longitudinal axis (3). The arcing chamber (2) has a power current path with a central contact pin (14), and has a separate rated current path provided with rated current contacts (11). The arcing chamber (2) is operated by a drive linkage (4) which moves the contact pin (14) and the rated current contacts (11). The drive linkage (4) is designed such that, at the start of the disconnection process, the contact pin (14) remains in a first dead point position until the rated current path is interrupted. The contact pin (14) can then be moved in the disconnection direction at a considerably higher speed than the rated current contacts (11). Toward the end of their disconnection travel, the rated current contacts (11) run into a second dead point position.

Abstract: The three-position, gas-insulated, metal-clad electrical switch inside a metal casing comprises first and second break contacts, a fixed grounding contact, and a switching element that is movable in an axial direction to interconnect said break contacts. The first and second break contacts and said fixed grounding contact are superposed in said axial direction, and the switching element is moved by means of a drive rod which passes through the fixed grounding contact, thereby enabling said switching element to occupy each of the three switching positions including a grounding position in which it connects the first break contact to the fixed grounding contact.

Abstract: A breaking module for an electrical switchgear apparatus comprises a vacuum cartridge comprising a body and a support frame of the cartridge. The cartridge is provided with a metal rod movable in translation and driving a movable contact. A collar both performs radial positioning of the body of the cartridge with respect to the frame and constitutes a guide sheath of the rod. For fitting, the collar can be opened so as to insert the rod radially therein. Once the body of the cartridge has been encircled, the collar is inserted radially in guide grooves of the frame.

Abstract: A switchgear apparatus comprises a vacuum cartridge one contact of which is fixedly secured to a metal rod protruding out from the cartridge. A flexible metallic electrical connector designed to electrically connect the rod to a busbar is provided, at one of its ends, with a bored hole in which one end of the rod is inserted. The joint between the flexible electrical connector and the rod is achieved by means of a braze implementing a metallic filler compound having a low melting temperature, so as not to damage the cartridge when the brazing operation is performed.

Abstract: A wire cut electric discharge machine according to the invention includes a machining tank storing a machining fluid, an upper arm disposed at an upper portion of the machining tank, a lower arm inserted into the machining tank, a wire electrode extending between the upper arm and the lower arm for performing electric discharge machining on a workpiece placed fixedly in the machining tank, a support member mounted to the machining tank for supporting the lower arm such that the lower arm is slidable relative to the machining tank and sealed from the machining tank, and an O-ring interposed between the lower arm and the support member. The support member has a groove formed all around its inner circumference, and the O-ring makes contact with sidewalls of the groove. Accordingly, even when the outside diameter of the O-ring varies depending on an error in diameter of the lower arm, contact between the sidewalls and the O-ring remains unchanged and fluid-tightness can be reliably ensured.