Abstract: A rolling bearing has a metallic member sealing member at one axial end thereof. The sealing member has a first cylinder section including a first cylinder section facing surface which is in contact with an outer peripheral surface of an inner ring, a second cylinder section connected to the first cylinder section and including a second cylinder section facing surface which faces the outer peripheral surface of the inner ring, and a flange section connected to the second cylinder section via a bend section. In a state before the sealing member is press fitted in the bearing, a radial position of the second cylinder section facing surface is closer to the flange section than a radial position of the first cylinder section facing surface. The rolling bearing has another metallic member sealing member at another axial end thereof.

Abstract: A syringe cylinder 12 includes a groove 32 formed in an inner peripheral surface thereof and extending over a predetermined length from an opening end 30 thereof. Even with the intermediate sliding stopper 14 located at a position where the groove 32 is formed, the pressure inside the syringe cylinder 12 can be reduced. Thus, during vacuum tapping, the intermediate sliding stopper 14 can be held in the vicinity of the opening end 30 of the syringe cylinder 12. Consequently, the intermediate sliding stopper 14 can be inserted into the syringe cylinder 12 in a correct posture and reliably moved to a predetermined position in the syringe cylinder 12.

Abstract: A supporting bearing is replaced with a new supporting bearing by conducting a first step and a second step. In the first step., an old inner ring before replacement is replaced with a new inner ring having an inner ring raceway diameter same as the old inner ring, and an axial length of an inner ring raceway face longer than the old inner ring so that a rolling roll is supported by this new inner ring in combination with an old outer ring and old cylindrical rollers. Thereafter, in the second step, the old cylindrical rollers are replaced with new cylindrical rollers having an axial length longer than the old cylindrical rollers, and simultaneously, the old outer ring is replaced with a new outer ring having an axial length of an outer ring raceway face longer than the old outer ring.

Abstract: In an optical head operable to record to and read from an optical recording medium, a beam emitted by a light-emitting element is reflected toward the light-emitting element by a first reflective mirror, and this reflected beam is reflected toward the optical recording medium by a second reflective mirror and focused on a recording surface of the optical recording medium. In this case, the first reflective mirror blocks a principal ray of the beam traveling toward the optical recording medium from the second reflective mirror, and the second reflective mirror consists of a plurality of concentric annular mirrors centered on the principal ray of the beam and separated from each other by a predetermined interval.

Abstract: In a prefilled syringe separately containing both a lidocaine solution and a hyaluronic acid solution, the viscosity of the hyaluronic acid solution is set so as to be sufficiently higher than the viscosity of the lidocaine solution. When lidocaine discharge from the tip of a hypodermic needle ends, the force f (N) required to discharge the hyaluronic acid solution from the needle tip suddenly increases, imparting sort of a jolt to the hand of the operator and creating a momentary sensation that the plunger is at rest. Letting the force f (N) required to discharge the lidocaine solution be P1 and the force f (N) required to discharge the hyaluronic acid solution be P2, the relationship therebetween is P1<P2. When (P2?P1)/P2>0.2, the operator is able to feel a sufficient jolt.

Abstract: An optical pickup having a light-emitting element, an objective lens unit, a reflecting mirror and a light-receiving element, emits a beam onto an optical recording medium and uses a reflected beam to read recorded information. In the objective lens unit, a central part of a surface, facing the light-emitting element, of an objective lens disposed so that an optical axis is substantially aligned with a chief ray of the beam emitted by the light-emitting element, is a transmissive diffraction grating, and a central part of a surface of the objective lens that will face the optical recording medium is a convex mirror which bulges toward the light-emitting element. The reflecting mirror, which is annular and encompasses the optical axis of the objective lens, reflects toward the objective lens the beam from the light-emitting element that has passed through the transmissive diffraction grating and been reflected by the convex mirror.

Abstract: An optical pickup having a light-emitting element, an objective lens unit, a reflecting mirror and a light-receiving element, emits a beam onto an optical recording medium and uses a reflected beam to read recorded information. In the objective lens unit, a central part of a surface, facing the light-emitting element, of an objective lens disposed so that an optical axis is substantially aligned with a chief ray of the beam emitted by the light-emitting element, is a transmissive diffraction grating, and a central part of a surface of the objective lens that will face the optical recording medium is a convex mirror which bulges toward the light-emitting element. The reflecting mirror, which is annular and encompasses the optical axis of the objective lens, reflects toward the objective lens the beam from the light-emitting element that has passed through the transmissive diffraction grating and been reflected by the convex mirror.

Abstract: A construction in which a light emitting/receiving element and an optical fiber are optically coupled by a lens system formed by a biconvex aspherical lens. This lens is featured by: a first lens surface (R1) and a second lens surface (R2) both having a positive refracting power. At least one lens surface is formed by an aspherical surface. A distance L between the light emitting portion and the light receiving portion is 1.3129 mm<L<2.0129 mm. Lens thickness t at its center is 0.2147 mm<t<0.8822 mm; and 0.5<.vertline.f/.phi..vertline.<2.2632 where f=focal length of the lens, and .phi.=incident pupil diameter.

Abstract: A thermoplastic elastomer composition is provided which is highly durable and free from oxidative deterioration when exposed to elevated temperature as in molding and also ambient temperature at which an end product thereof is used. These advantageous features are attributable to the use of a hydrogenated oil of the class disclosed which serves effectively to suppress the tendency of an elastomer undergoing gelation or cross-linking particularly when heated in the atmosphere. The hydrogenated oil is derivable from hydrogenation of a liquid product resulting from thermally treating a coal tar or distillates thereof at above 400.degree. C.; a liquid product resulting from thermally treating at above 400.degree. C. a petroleum crude oil, distillates thereof, or a liquid hydrocarbon derived from catalytic cracking, hydrogenative cracking or catalytic reforming of petroleum distillates; or a thermally cracked tar resulting from thermally cracking a petroleum crude oil or distillates thereof.

Abstract: A process is provided for converting a heavy hydrocarbon oil into light hydrocarbon fuels by thermal cracking or hydrocracking, which comprises adding to about 100 parts by weight of the heavy hydrocarbon oil feedstock (A) about 0.1 to 50 parts by weight of a substance (B) which is a hydrogenated oil obtained by aromatic ring hydrogenation of about 430.degree.-600.degree. C. thermal-treated or cracked petroleum feedstock product oil boiling higher than about 200.degree. C. to hydrogenate abot 20 to 90% of the aromatic rings present.

Abstract: Oil compositions are disclosed which are substantially undeteriorative even in an oxidizing atmosphere and suitably applicable as lubricating oils, heat transfer oils, heat treating oils and electrical discharge machining oils. The composition is essentially comprised of 100 weight parts of a selected base oil of a mineral or synthetic class and 0.1 to 20 weight parts of a specified oil fraction. The oil fraction is an oil generated from a hydrogenated pitch and distilled to boil at from 160.degree. to 550.degree. C., the pitch being derived by primarily heat-treating and hydrogenating a heavy oil of a petroleum or coal origin, or an oil resulting from secondarily heat-treating the pitch and boiling at from 160.degree. to 550.degree. C.

Abstract: A rubber composition comprising a naturally occurring and/or synthetic rubber and a selected amount of a hydrogen donor material having a hydrogen transfer (hydrogen atom/mol anthracene) of at least 0.1. The composition is highly stable during molding and in use under severe temperature and shearing conditions and substantially immune to deterioration by heat or radiation and ultraviolet rays.

Abstract: A thermoplastic resin composition comprising a thermoplastic resin (A) and a hydrogen donative material or Component (B) added in an amount of 0.01-40 weight parts per 100 weight parts resin (A), the hydrogen donative material having a transfer of hydrogen or at least 0.1 (hydrogen atoms/molecules anthracene). The composition further incorporates metal salts of aliphatic acid and/or hydrotalcites and a selected class of oxidation inhibitors.

Abstract: An oil composition contains 100 parts by weight of a base oil selected from the group consisting of mineral base oil, synthetic base oil and mixtures thereof, and 0.1 to 20 parts by weight of a hydrogenated oil obtained by hydrogenating an oil selected from the group consisting of coal type tar, oil produced by fractionating coal type tar, a hydrocarbon obtained by thermally cracking petroleum and having a boiling point of not lower than 200.degree. C., a hydrocarbon obtained by catalytically cracking petroleum and having a boiling point of not lower than 200.degree. C., a hydrocarbon obtained by catalytically reforming petroleum and having a boiling point of not lower than 200.degree. C., and mixtures thereof, whereby the hydrogenated oil has the hydrogen-donating properties of not lower than three times the hydrogen-donating properties of the base oil at temperatures of not lower than 350.degree. C.

Abstract: A method for hydrocracking a heavy fraction oil which comprises cracking a heavy fraction oil in the coexistence of a catalyst and a hydrogen donating solvent such as tetralin while adding a hydrogen-containing gas to the cracking reactor thereby inhibiting the formation of carbonaceous substances and precursors thereof and then hydrogenating the reaction products in the presence of a solid catalyst while adding a hydrogen-containing gas to the hydrogenating reactor thereby to convert the toluene-insoluble carbonaceous substances and precursors thereof to toluene-soluble ones, thus causing no clogging in an apparatus used.

Abstract: A method for hydrocracking a heavy fraction oil characterized by cracking a heavy fraction oil in the presence of a hydrogen donating solvent and hydrogen gas and circulating a fraction having a specific boiling range as the circulating solvent through the cracking reactor whereby the formation of carbonaceous substances is greatly inhibited, the supply of a makeup hydrogen donating solvent is disposed with and the concentration of tetralin in the circulating solvent is maintained at a fixed or higher level.

Abstract: A process for preparing a fluid for traction drive from a fraction containing compounds having at least four aromatic rings is disclosed. The fraction is a by-product produced at the time of the preparation of alpha-methyl-benzylalkylbenzenes by alkylation of at least one compound selected from C.sub.7 -C.sub.10 alkylbenzenes with styrene in the presence of an acid catalyst. The process comprises the steps of decomposing the fraction in an atmosphere of hydrogen at a predetermined temperature and pressure, collecting a decomposition product having a boiling range not higher than 450.degree. C. and then subjecting the decomposition product to nuclear hydrogenation at aromatic rings thereof in the presence of a catalyst capable of nuclear hydrogenation.

Abstract: A method for cracking a heavy fraction oil is provided in which is solved a problem as to an increase in pressure loss due to coking in a cracking tower during the treatment of heavy fraction oils containing at least 1.0 wt. % of asphaltene. The cracking tower is vertically divided into at least two portions with a partition for housing a solid catalyst having a hydrogenation function, and the divided portions are communicated with each other at the upper and lower parts of the tower. A starting heavy fraction oil, a hydrogen donative solvent, and a hydrogen-containing gas are introduced into at least one of the divided portions at the lower part thereof, and further the fluid is circulated between the divided portions. Another method for cracking heavy fraction oils is provided in which a heavy hydrocarbon oil containing at least 1.0 wt.

Abstract: A method of pre-heating feed water for boilers is disclosed which utilizes the exchange of heat between the tube side of a heat-exchanger which contains de-salinated and de-ionized water and the shell side which contains hydrocarbon vapors boiling in the range of 90.degree. to 150.degree. C. The tubes are made of carbon steel with their outer surfaces aluminized.