Abstract: A sealing apparatus disposed between a housing and a shaft received in the housing. The sealing apparatus has, at least, a fitting portion which is fitted to either one of the housing and the shaft, and a seal lip of an elastic material which extends axially obliquely from the fitting portion and is provided at its distal end with a seal portion. The sealing apparatus is provided with a bend preventing portion which is formed at the distal end of the seal lip such as to extend axially outwardly of the seal portion.

Abstract: An oil seal disposed between a housing and a rotating shaft received in the hollow inside of the housing so as to prevent a liquid in the housing from leaking to the outside. The oil seal has a first metal ring and a second metal ring. The first metal ring is secured at the outer peripheral portion thereof to the housing and is provided at the inner peripheral portion thereof with an annular seal lip which is in slide contact with the outer peripheral surface of the rotating shaft thereby to seal the liquid in the housing. The second metal ring is connected at the outer peripheral portion thereof to the outer peripheral portion of the first metal ring and is separated at the inner peripheral portion thereof from the inner peripheral portion of the first metal ring in the axial direction of the rotating shaft so as to form an annular space in cooperation with the first metal ring. The second metal ring further has a dust lip which is in slide contact with the outer peripheral surface of the rotating shaft.

Abstract: An oil seal mounting jig for mounting an oil seal in a hole formed in the wall of a machine housing, the oil seal being provided on the inner periphery thereof with an annular oil-side tapered surface for contact with the oil to be sealed and an air-side tapered surface having an inclination angle greater than that of the oil-side tapered surface. The oil seal mounting jig has a hollow insertion cylinder opened at its one end and closed at its other end. A hub member for carrying the oil seal is adapted to be slidingly received by the cylinder from the open end of the latter and has an outer peripheral surface of an outside diameter substantially equal to that of a shaft on which the oil seal is to be mounted, one end surface of the hub member having a chamfered portion adapted to abut the oil-side tapered surface of the oil seal.

Abstract: A sealing apparatus comprises an annular elastic seal member having a main annular lip and an auxiliary annular lip extending substantially radially inwardly to a rotatable shaft with inclination so as to define an annular chamber between both the lips. A plurality of projections or grooves are formed in an inner peripheral surface of the auxiliary annular lip in the vicinity of a sealing portion thereof to form flow passages which allow the annular chamber to be communicated to the atmosphere upon generation of vacuum within the annular chamber, to thereby prevent excessive contact pressure from being applied to the sealing portions of the main and auxiliary sealing lips under action of vacuum and protect the seal from abrasion.

Abstract: The backup ring offered by the present device is formed to be a ring-shaped body and is cut at one place thereof in the circumferential direction by a plane which is made to parallel the radius passing the central axial line of the ring-shaped body, which is inclined to the end surface of the ring-shaped body and whose point of intersection with the central axial line is located outside the ring-shaped body.

Abstract: A sealing device comprising a first seal member mounted on a rotating shaft extending through a housing and having a body portion and a radial component formed integral with and extending radially outwardly from the body portion, the body portion forming an annular groove, and a second seal member mounted on the housing to seal a gap between the housing and the rotating shaft by cooperating with the first seal member, the second seal member having a reinforcement made of a metal plate and a seal lip made of resilient rubber provided on the inner end of the reinforcement member and in sliding contact with the radial component of the first seal member.

Abstract: There is provided a sealing material comprising 100 parts by weight of a fibrous material made of polyester, polyamide or the like which constitutes a non-woven cloth; and 10 to 150 parts by weight, based on the weight after dried and hardened, of one or a mixture of a styrene-butadiene polymer base latex, an acrylonitrile-butadiene polymer base latex, an acrylic ester polymer base latex, a polysiloxane base latex and/or a fluorine-contained rubber base latex impregnated in the fibrous material.

Abstract: A bellows apparatus consisting essentially of a bellows main body and restriction means for restricting elongation and contraction, said restriction means comprising plural annular guide metals provided integrally to said bellows main body with a predetermined spacing therebetween in the axial direction, plural guide members secured integrally to each of said guide metals and extending in the axial direction, and plural stoppers extending integrally in the circumferential direction from the edge section in the axial direction of said guide members. Said guide members displaced with respect to each other in the circumferential direction, and their respective stoppers engage with adjacent stoppers and the annular guide metals to thus restrict elongation and contraction respectively of said bellows main body.

Abstract: The present invention relates to a sealing device comprising a sealing member and a cap, said sealing member consisting of a reinforcement ring with an axial portion and radial portion, a rubber lip portion secured to the end of the radial portion, and a lip-like annular sealing piece secured to the side of the radial portion, said cap consisting of a cylinder portion and a flange portion extending inwardly in the radial direction from the cylinder portion, whereby the axial portion of said reinforcement ring engages with the inside of the cylinder portion of the cap and the annular sealing piece bears tightly against the inner surface of the flange of the cap.

Abstract: A roll neck sealing device comprising a neck seal consisting of an inside neck seal and an outside neck seal, both fitted to the outer surface of the neck portion of a roll, and a preventive means, one end of which is secured to the outside neck seal and the other end of which is inserted through a tapered hole, formed in the inside neck seal, into a core hole formed in the fixing pin secured to the end of the sleeve, said preventive means being adapted for preventing relative rotation between the neck seal and the sleeve, whereby the axial length over which the preventive means is inserted into the fixing pin is set greater than the maximum allowable axial play between the sleeve and the bushing, said axial play being caused when the sealing member is being replaced.

Abstract: Disclosed is a hydrodynamic seal comprising a sealing member of a fluorine resin including a sealing lip portion having a conical shape and a fixing portion extending from the sealing lip portion in the radial direction, a gripping support member for gripping and supporting the fixing portion of said sealing member and a coil spring member wound helically in the conical shape on the sealing lip portion of the sealing member, wherein a spiral projection is formed on the peripheral face of the sealing lip portion by the spring member.

Abstract: A mechanical shaft seal has a seal ring made of rubber or the like elastic material and disposed between a housing and a floating seat. The seal ring has a poly-arcuate shape consisting of continuous arcuate portions of different diameters. The maximum outer diameter of the seal ring is larger than the inner diameter of the peripheral surface of a stepped recess formed in the housing, while the minimum inner diameter of the seal ring is smaller than the outer diameter of the peripheral surface of a stepped recess formed on the floating seat.

Abstract: A bellows apparatus consisting essentially of a bellows main body and restriction means for restricting elongation and contraction, said restriction means comprising plural annular guide metals provided integrally to said bellows main body with a predetermined spacing therebetween in the axial direction, plural guide members secured integrally to each of said guide metals and extending in the axial direction, and plural stoppers extending integrally in the circumferential direction from the edge section in the axial direction of said guide members. Said guide members are disposed in the circumferential direction, engage with said stoppers provided thereto and thus restrict elongation and contraction of said bellows main body.

Abstract: A reed valve assembly in which a gummous material coating is applied to the noise-propagating passageway of a secondary-air exhaust gas recombustion system for internal combustion engines.

Abstract: Disclosed is a method of measuring the directional properties of the surface of shafts by pressing a measuring contact terminal against the surface of an objective shaft which is horizontally and rotatably supported, to thereby measure the amount of movement in the axial direction of the contact terminal caused by the rotation of the object shaft.

Abstract: Disclosed is an inverted cup-shaped cover of deformable material to be fitted over an open socket housing end of a pivotal ball joint assembly. The cover has a pair of opposite end openings, one of which is considerably smaller in diameter than the other and receives therethrough in sealed relationship the shank of a ball stud protruding from the housing through an open end thereof. The cover has a gently curved longitudinal sectional configuration and is flared toward its other end opening at which it is fitted over the open end of the housing. A ring is embedded in the flared portion of the cover and has an inner circumferential edge exposed toward the interior of the cover. This inner edge is sharp-angled and has a diameter slightly smaller than the maximum diameter of the housing at the open end thereof. This ring is formed of resilient material, for example, spring steel.

Abstract: An improvement in valves for suction or exhaust passages of an internal combustion engine, wherein the projection of the plane of the fixing seat of the valve plate and the plane of the valve seat are not parallel. The fixing seat can be tapered. The valve seat can either have a straight angle taper or a curved face. The angle of difference between the two planes is from 30' to 10.degree., preferably from 1.degree. to 3.degree..

Abstract: A molding machine for producing products of a rubber-like resilient material, particularly oil seals in which a first mold part is stationarily supported in axial spaced relation to a main base, a base between the main base and first mold part is axially movable toward and away from the first mold part and supports a second complementary mold part, a holder between and axially spaced from the first and second mold parts is mounted for limited axial movement and rotary movement in a plane parallel to the first and second mold parts, with the holder carrying two diametrically opposite further mold parts spaced apart an equal distance from the axis of the rotary movement and one of the further mold parts being in substantially registry with the first and second mold parts so that movement of the base relative to the holder brings the second mold part into operative relation to the one further mold part and continued movement of the movable base moves the holder toward the first mold part until the first mold par

Abstract: A photocurable composition comprising the reaction product of the addition compound obtained from an epoxy resin and a photopolymerizable .alpha..beta.-unsaturated carboxylic acid, and a dibasic acid anhydride; a photopolymerizable monomer; and a photopolymerization initiator. The composition is used for making a relief image.

Abstract: A device for sealing a steel door of a coke oven includes a ring-shaped steel packing fitted over an outer surface of the steel door so as to contact a side wall of the coke oven when the steel door is closed, a packing retainer fitted over the outer surface of the steel packing and provided with a ring-shaped groove opened toward the side wall, a ring-shaped packing assembly fitted into the groove so as to press against the side wall and a holder for movably holding the steel packing and the packing retainer. The packing assembly extends closer to the side wall of the coke oven than the steel packing.