Abstract: A shaft seal of the kind in which at least two sealing rings are spaced at axially from one another on a rotatable shaft or on a bush fastened to the shaft is provided between the sealing rings with one or more deflectors which are spaced from the sealing rings and are engageable with the shaft or bush and act to deflect and whirl liquid lubricant circulating between the sealing rings so as to improve circulation of the lubricant and lengthen the life of the seals.

Abstract: A corrugated radial spacer expander to be combined with side rails to form a compound oil scraping ring for internal combustion engines. The spacer expander has an annular shape cut at a portion thereof to present two opposing ends and has a corrugation consisting of successively alternating valleys and crests which are connected by intermediate flanks. At each one of said ends, there is formed a protrusion which bridges the neighbouring flanks over a valley adjacent the end, which protrusion is so shaped and positioned to prevent the valley at one end from being received by the valley at the other end, thereby ensuring that the opposing ends are correctly positioned in end to end relation, which would otherwise deteriorate the expansion force of the expander to make the oil scraper ring inoperative.

Abstract: An oil seal having an annular sealing surface and having, on one tapered side of the sealing surface, circumferential series of oppositely inclined V-shaped ribs which converge toward the sealing surface, the ribs being truncated adjacent the sealing surface to a diameter which is equal to or only slightly greater than the diameter of the sealing surface. The edges of the truncated portions of the ribs, when in contact around a rotating shaft, define with the shaft and with the sealing surface, a series of oppositely disposed wedge shaped spaces which pump oil leaking past the sealing surface back toward the oil side of the sealing surface regardless of the direction of rotation of the shaft.

Abstract: A rotary drilling head assembly having a main body through which an axial bore is formed for sealingly receiving, in an axially rotatable and longitudinally slidable manner, a driving member therethrough, thereby enabling the driving member to be moved longitudinally respective to the head while it is being axially rotated by the turntable.An outflow passageway conducts fluid flow away from the head, while a second seal means controls fluid flow between the relative rotating parts of the assembly.

Abstract: A Fire seal is formed in three layers, an elastic inner tube which is inflatable, a resilient fire resistant felt surrounding the tube, and a wear resistant rubber impregnated outer layer.

Abstract: An obturator for the rotor of a machine such as a compressor for special or oxic fluids consists of an annular seal clamped in the active position between stationary knife-edge elements provided on the rotor and movable knife-edge elements carried by an annular supporting member which is capable of moving along the axis of the machine under the action of magnetic means between an inactive position at a distance from the rotor and an active position in which the supporting member is coupled with the rotor as a result of magnetic attraction forces. The movable knife-edge elements are joined to the movable supporting member by resilient means whereby an obturation force of lower value than the magnetic attraction force is exerted in the direction of the stationary knife-edge elements.

Abstract: A device for producing a seal between movable and/or stationary parts, such as a piston and a cylinder particularly under conditions of high fluid pressures, comprises a sealing ring having an O-ring configuration and fabricated of a material such as rubber. A support ring is disposed on at least one side of the sealing ring in coaxial relation thereto, the support ring being fabricated of a thermoplastic polymer material having a hardness greater than the sealing ring and being formed with a concavely curved contact surface facing and engaging the sealing ring. A guide ring having an L-shaped cross section is disposed outside of the support ring relative to the sealing ring in coaxial relation to the sealing and support rings, and consists of a polymer material having a hardness greater than the thermoplastic polymer of the support ring.

Abstract: A lip seal for use between two relatively-rotating surfaces, and in which the contact pressure increases with distance from the sealing lip for preventing the leakage of fluid therebetween irrespective of the direction of relative rotation. The seal has projections on the "air" side of the sealing lip (that is to say, the side remote from the fluid to be sealed) which so engage one of the relatively-rotating surfaces as to have a contact area of which two opposite sides extend away from the sealing lip portion and diverge away from each other.