Abstract: A device for forcing a piston ring, which is a sealing member interposed between the cylindrical outer surface of a piston and the bore wall of a cylinder, radially outwardly beyond the cylindrical outer surface of the piston. A plunger rod which forces the piston ring radially outwardly is extended through a coiled spring. One end of the coiled spring is enlarged in diameter and is made into engagement with the edge surface of a radial hole into which is inserted the coiled spring while the other end of the coiled spring is made into engagement with the inner end of the plunger rod, whereby the piston ring is forced to extend radially outwardly by the compressive force of the coiled spring acting on the piston ring through a plunger.

Abstract: A shaft seal for a gas pumping device comprising a mechanical seal (5,6) and a labyrinth seal in form of a sliding bearing (4). A chamber (7) between the mechanical seal and the sliding bearing is fed with lubricant for the bearing at a pressure being higher than the gas pressure on the other side of the mechanical seal so that there is no leakage of gas past the mechanical seal.

Abstract: An apparatus in which an annular ring is carried within a groove about one member for slidably engaging the cylindrical surface of another member. In certain of the embodiments, the ring is a seal ring to form a sealed joint, and, in another embodiment, the ring is a bearing ring to form a bearing assembly. In each case, a recess is formed in the side of the ring intermediate lips or annular surfaces thereof which slidably engage the cylindrical surface, and a metal ring is moved into a position opposite the recess and radially distorted into the recess to retain the seal or bearing ring within the groove.

Abstract: A sealing assembly for a universal joint formed as an annular disc made of resilient material extending in sealing engagement between an inner joint member or a shaft part thereof and an outer joint member with the annular disc being in sealed engagement with the outer joint member and having a central bore formed with a diameter smaller than the diameter of the shaft of the inner joint member extending therethrough in order to effect sealing engagement with the shaft, the central bore being surrounded by a reinforcing annular portion which is dimensioned with an enlarged thickness for reinforcing purposes thereby to enable large angles of articulation to be endured even when the central bore is under extreme loads thereby to provide a rugged construction for the sealing assembly.

Abstract: A molded resilient ring seal with support rings mold bonded or bonded and connected to both ends. The molded resilient material portion of the seal utilizes unique contouring to reduce internal resilient material stresses during use, enabling the seal to seal higher pressures at elevated temperatures for longer periods of time. A number of support ring configurations are also disclosed, which further enhance sealing ability of the resilient material.

Abstract: A gasket such as a head gasket having a sealing bead on the main body portion. The sealing bead terminates just short of the gasket periphery. An embossment at the periphery extends inwardly to the sealing bead and merges therewith. The embossment and bead may merge on the extension portion of a head gasket to seal against the passage of oil from the associated engine crankcase.

Abstract: Washing out of a grease fill and loss of the barrier effect with respect to dust is avoided in a labyrinth seal of a cone crusher, the labyrinth seal comprising a vertical labyrinth filled with grease and a horizontal labyrinth formed of at least one groove on the circumference of the inner sealing half and of at least one groove, and webs, on the inner circumference of the outer sealing half of the labyrinth seal.

Abstract: A gasket including a sheet having a composition of 40 to 80% by weight of thin flakes of expanded vermiculite, 1 to 30% by weight of fibers, 5 to 40% by weight of fine filling grains, and appropriate amounts of a binding agent and a vulcanizing agent. The sheet also has a metal plate laminated thereto. A vortex gasket may be formed by spirally winding a metal hoop together with a filling material, which is composed primarily of expanded vermiculite.

Abstract: A coupler and manifold assembly which makes it possible to turn the shaft and impellers of an absorption chiller circulating pump with an external drive means instead of a hermatically sealed drive means, comprising an interconnecting combination of a plurality of restrictive orifices, a plurality of solenoids, conduit, and a plurality of chambers to help provide a differential vacuum across a seal face of a double mechanical rotating seal, to substantially prevent the introduction of air into the vacuum of the essentially closed system of an absorption chiller, during operation and/or shut down of the absorption chiller.

Abstract: An oil scraper piston ring assembly includes an oil scraper ring received in a piston groove and being in circular contact with a first side wall of the groove; and a spring ring received in the groove between the oil scraper ring and a second side wall of the groove. The spring ring has circumferentially distributed resilient tongues oriented alternatingly radially inwardly and radially outwardly. The spring ring has a radially outer circular part situated axially adjacent the oil scraper ring and a radially inner circular part bent with respect to the radially outer circular part and extending at least partially radially adjacent an inner periphery of the oil scraper ring. The oil scraper ring is a steel band ring of relatively small axial height, the spring ring is a resilient band ring also of relatively small axial height, and the oil scraper ring and the spring ring have approximately identical thicknesses of material.

Abstract: A piston ring formed from a plastics material and having a maximum pressure against the associated cylinder of between 0.10 and 1.50 MN/m.sup.2 and preferably 0.50 MN/m.sup.2. One possible material for such piston rings is polyetheretherketone. The benefits obtained are greater conformability which leads to a reduction in the number of piston rings which need be used for a particular piston. This in turn reduces friction so increasing the performance of the associated engine. Acceptable wear rates and ability to withstand operating temperatures have been found in these piston rings.

Abstract: A packing which includes a plurality of seal portions integrally formed on an annular elastic sheet. The seal portions are spaced about the circumference of the sheet and project from one side surface of the sheet. Each seal portion has a through hole extending entirely through the sheet parallel to the center axis of the sheet. In the preferred embodiment, the packing is used in a rotary change-over valve and each seal portion has an annular rib at its free end which is adapted to fit in a corresponding hole in a rotary valve inlet element with the packing held in a recess in the inlet element between the inlet element and a rotary valve outlet element.

Abstract: A seal for interconnecting a vibrating plenum chamber to a stationary air duct for air flow communication therebetween. The chamber defines an inlet duct bounded by an upstream facing annular sealing surface. A baffle member is attached to, and encircles, the adjacent end of the stationary air duct. The baffle member comprises a pair of outwardly converging annular sides sealingly joined at their outer radius, with the innermost annular portion of one side attached to the stationary air duct and the innermost annular portion of the other side attached to a sealing member defining an annular surface slidingly engaging the upstream facing annular sealing surface on the inlet duct.

Abstract: An inclinometer, adapted to be rigidly secured to an object, for detecting the amount and direction of the inclination of the object in any direction with respect to a horizontal or other reference plane. The inclinometer comprises a fiber optic rod rigidly mounted at one of its ends and having a weight secured to its free end. The free end of the rod has two degrees of freedom of motion with respect to its rigidly mounted end. Light is supplied to the rod's mounted end and light emitted from the rod's free end falls on a continuous two dimensional optical detection surface area of an optical detector which uniquely detects the position of the spot of light falling anywhere on its surface area, regardless of the direction in which the spot of light moves on its surface area. From the position of the spot of light on the surface area, the amount and direction of inclination of the object can be determined.

Abstract: A shaping element designed to form a sewer pipe receiving opening during pouring of concrete to mould a manhole. The shaping element also holds a gasket seal in position until the concrete is set. The shaping element is made of two axially separable parts each having a flange to form part of the sewer pipe receiving opening. The inner end of one flange has an L-shaped extension defining a radially inwardly extending step and an axially extending end portion, the inner end of the other part extends short of the step and overlaps the axial extension whereby there is formed a gasket seal receiving peripheral channel of L-shaped cross-section. The two parts are completely closed at their outer ends and are assembled by means of non-circular telescopic tubes at their center to maintain the same in a predetermined relative orientation.

Abstract: Seals between a wheel and a cover which rotate in relation to each other are installed under utilization of auxiliary equipment which includes a ring with annularly distributed bores and held against an abutment surface in the wheel while another ring of U-shaped cross-section has one of the flanges in abutment with an annular abutment surface of the cover; the other flange has threaded bores for receiving tension screws by means of which the two rings are held together for temporarily holding the wheel to the cover, particularly during installation of the axle and bolting of the cover, for example, to the swivel in a full track vehicle.

Abstract: A seal assembly has a pair of relatively rotatable sub-assemblies adapted to be attached and sealed respectively to relatively fixed and relatively rotatable members to confine the flow of fluid through the space between the members to a restricted passage. One of the sub-assemblies includes one of a pair of relatively rotatable seal rings. Coupling means are operable to selectively couple the other seal ring of the pair to a sub-assembly in a stand-by state in which the seal rings are not in relatively rotated engagement and, alternately, in a working state in which the seal rings are in relatively rotated engagement to seal the restricted passage.

Abstract: A pneumatic safety seal joint, made of elastomer, generally designed to be installed in a slot or groove, this joint having an inflatable internal volume under the pressure of a fluid, and an external seal surface. The joint has an internal volume with maximum internal width l and a maximum internal height H and has an internal sealed septum which divides the internal volume into two chambers, each with a means for pressurization. This internal septum is connected to the lateral walls of the joint such that the respective volumes of the two chambers are in a ratio between 0.9 and 1.1 and when l/H is between 1 and 2, the developed width L of this sealed septum is between 1.1 times and 1.4 times l, when l/H is between 2 and 8, the developed width L is such that 1.ltoreq.L.ltoreq.1.21. In case of the puncturing of one chamber the internal septum deforms and comes to press against the wall to be sealed, maintaining the seal.

Abstract: A seal means for use in the Stirling engine or the like, the seal means comprising: a cylinder including a piston reciprocating therein, and a buffer chamber located in one of the spaces produced at the both sides of the piston; a tank for storing the working fluid in the buffer chamber when the engine is at rest, the tank being located outside the cylinder; a means for introducing the working fluid in the tank into the buffer chamber under pressure when the engine is started; a crank shaft driven by means of the piston through a piston rod; a crankcase for accommodating the crank shaft; a plurality of packings for preventing the working fluid in the buffer chamber from entering the crankcase by flowing along the outer surface of the moving piston rod, the packings being arranged in contact with the outer surface of the piston rod; and a means for returning the working fluid leaked in the packings from the buffer chamber through the moving piston rod to the buffer chamber.

Abstract: An improved radial oil seal adapted to be disposed between a housing bore and a rotation shaft inserted therein for sealing of fluid in a housing. The radial oil seal includes a first seal ring having a rubber seal lip in sealing contact with the rotation shaft, a second seal ring having a synthetic resin seal lip and disposed at the air side of and adjacent the first seal ring, the synthetic resin seal lip extending along the back face of the rubber seal lip and being in sealing contact with the rotation shaft. A reinforcing ring having a substantial rigidity is disposed at the air side of and adjacent the second seal ring and curved along a bent portion of the synthetic resin seal lip so as to support the back face of the bent portion. An outer ring is fitted into the housing bore for firmly holding the radially outer portions of the first and second seal rings and the reinforcing ring.