Abstract: A tube mill operated under superpressure in the milling chamber is sealed by means of blocking air, which is made available in a blocking air chamber (9) arranged on the stationary part of the journal (2) of the tube mill. A blocking air channel is provided between the stationary and the rotating part of the tube mill and joins the blocking air chamber (9) to the milling chamber. The blocking air channel contains an inclined extending section (19), which is arranged at an acute angle to the longitudinal axis of the tube mill.

Abstract: A cylinder head gasket for internal combustion engines has all-metal composite refractory seal around each of the cylinder openings and elastomeric seals around each of the liquid passages, the latter being symetrically disposed on opposite sides of the central plate. The refractory seals comprise ribbed sheet metal members disposed symetrically and having perimeters extending inwardly at each cylinder opening, and cover members reaching from one side and the other over the perimeters.

Abstract: A repeatedly but easily compressible seal structure providing high resistance to the passage of fire across a long seal path between two opposing members is provided by an assembly including a long spring member that is laterally compressible, an outer circular cover of an ablative material and an inner core of high temperature resistant material. The spring is fitted within the cover and tends to restore it to circular cross section after compression between the opposing members is released, so that the cover provides a seal for normal operation. The inner core at least substantially fills the space within the compressed spring. Thus, in the event of fire, the cover acts as an initial ablative barrier but after it decomposes on the exposed side the spring holds the core in position to maintain the thermal and fire barrier for a desired interval.

Abstract: An annular spacer-expander spaces and positions two rails in a piston ring groove of a piston for an internal combustion engine. The spacer-expander comprises a plurality of U-shaped members which lie in respective angularly spaced planes including the spacer-expander axis and whose arms open inwardly of the spacer-expander for urging radially inner ends of respective rails into contact with respective radial walls of the piston ring groove. The U-shaped members are interlinked in serpentine fashion to give the spacer-expander circumferential resilience. The ends of the U-shaped members are bent outwardly for urging the rails into contact with an associated cylinder or liner. A plurality of rail spacer lugs are provided for controlling axial movement of the radially outer ends of the rails. Each ring spacer lug is located between a pair of adjacent U-shaped members and is connected to that portion of one of the pair which forms the base of the U.

Abstract: A seal assembly for a rotary drill bit of the type comprising a bearing journal constituting a first bearing member, and roller cutter having a blind end bore therein, constituting a second bearing member, receiving the journal and an annular recess at the open end of the bore, the annular recess and journal defining an annular cavity in the bit. The seal assembly is positioned in the cavity for holding lubricant in the bit and comprises a ring of relatively rigid material movable with respect to the journal and the roller cutter in the longitudinal axial direction thereof and having a sealing face. An elastomeric seal member sealingly engages the movable ring and one of the bearing members and biases the ring to a position in which the sealing face of the ring is in sealing engagement.

Abstract: The disclosed arrangement is for sealing between two cylindrical bodies with an annular gasket ring in such a way that the seal is established only under conditions of a predetermined fluid pressure, so that at a lower pressure a flow is permitted across the seal. The ring in its relaxed state has a clearance spacing from the sealing surfaces. It has a radial cross-sectional configuration such that when there is fluid pressure against the ring from one side, it deforms outwardly to provide the necessary sealing force against the sealing surfaces. The radial cross-section of the ring has a first portion extending along the sealing surface of the outer body and at least one further portion extending in substantially radial manner from the first portion. The deformation takes place by a radial cross-sectional rotation about a torsional axis which is located in the first part of the ring. Various ring and seat configurations are described.

Abstract: A steering ball seal includes a rigid annular outer case having a radially extending elastomeric sealing member bonded thereto. The sealing member includes a pair of sealing lips which extend radially inwardly of the case. The sealing member further includes an integral annular protective assembly tab which extends axially thereof and which contains a radially protruding retention ridge. The sealing member also includes an integral retention bead radially outwardly of the ridge. The lip and bead cooperate to provide for resilient insertion and removal of an inner case which is retained against the radial body of the sealing member to provide rigidity of the member during operation of the seal. In a preferred form, the inner case is of resilient polyethelene material, and includes a split body construction to facilitate its installation over the steering ball.

Abstract: Sealing rings of the type comprising a first ring member and a second ring member. The first ring member has an external radially extending face, an internally radially extending face, an inner axially extending face, and an outer axially extending face. The inner axially extending face has a series of internal labyrinth annular grooves and an axially extending groove joining the internal labyrinth annular grooves and opening to the external radially extending face. The internal radially extending face has an axially extending first annular recess having parallel inwardly radially facing and outwardly radially facing walls.The second ring member has an axially extending first annular flange having an outwardly facing portion and an inwardly facing portion adapted and constructed to be complementary with the recess.The sealing rings are improved in that they further comprise at least one of the following characteristics:a.

Abstract: A seal assembly (54) for closing a cavity (55) between a rotor (24), a bearing retainer (38) and a crankshaft (80) to retain a fluid therein for lubricating bearings (48, 50, 90) associated with the crankshaft (80). Seal assembly (54) has a disc (72) with a first resilient member (56) that engages the rotor surface (44) and a second eccentrically positioned resilient member (62), that engages surface (65) on bearing retainer (38). Disc (72) which is attached to crankshaft (80) rotates with ring gear (36) around pinion (32) to maintain a sealed cavity (55) even though the first and second resilient members (56 and 62) rotate on their respectively sealing surfaces (44 and 65) with different revolutions per minute.

Abstract: A mechanical face seal comprises a seat associated with one of a pair of relatively rotatable components and a seal face member associated with the other component and movable axially with respect thereto. Said seal face member has a sealing face which engages an opposed face of the seat to provide a seal therebetween, and an integral secondary sealing means remote from said face. Means is provided to urge the seal face member axially into sealing engagement with the seat and the secondary sealing means radially into sealing engagement with the component associated with the seal face member.

Abstract: A sealing device for a rotary shaft is provided with a spiral member having a determined pitch and a determined thickness on a rotating portion and/or a stationary portion corresponding to the rotating portion. The spiral member may be provided via a shaft sleeve, or may be directly attached on a rotating portion and/or a stationary portion corresponding to the rotating portion. The spiral member may be in advance shaped in a spiral form, or may be a string-like flexible member which may be shaped in a spiral form.

Abstract: A cylinder head gasket has outwardly open grooves formed in the compressible refractory body around the fluid passages to be sealed and sealing strips received in the grooves so that webs of the strips lying along the bottoms of the grooves are set back from the faces of the gasket while wings of the strips overhang these faces adjoining the grooves.

Abstract: A rotary fluid seal having a flexible sealing ring which floats between relatively rotatable counterface members and has contact faces which bear on the counterfaces under the influence of centrifugal force, such as forms the subject of U.S. Pat. No. 4,348,031, is provided with a rigid spring-retaining ring which permits but limits centrifugal expansion of a spring loading the contact faces against the counterfaces.

Abstract: Scraper rings are known which are mounted in the back plate of a hydraulic cylinder to scrape a hydraulic piston rod. Known scrapers are not very suitable for applications where the piston rod is liable to movement and vibration e.g. in pneumatic pistons and cylinders. The present invention provides a shaft scraper ring arrangement in which the scraper ring is so supported so as to be movable, to a limited extent, in a plane transverse to the shaft or rod which is to be scraped. Cylinder 1 contains a piston 2 and a back plate 3. Supported centrally in the back plate 3 is a housing 4 which supports a plate 5 carrying a rod scraper 5a. Piston 2 is supported by a piston rod 2a which is scraped by the rod scraper. A seal 10 located on the rod scraper plate 5 bears against the rod 2a. Rod scraper plate 5 has limited freedom for movement in a plane transverse to the rod 2a. The plate 5 is loosely carried by the housing 4 being located between two felt oil retaining annular rings 8.

Abstract: A stern tube seal having a fixed slidable ring and a rotatable and slidable ring in close contact and sliding with respect to the fixed slidable ring, wherein an annular groove is formed in a sliding end surface of the fixed slidable ring, a leaked liquid recovery line is disposed from the fixed slidable ring to the side of inboard, and if necessary, an annular lip portion having a pressure receiving surface disposed on the side of inboard is fitted within the annular groove.

Abstract: A seal assembly apt to be interposed between two members movable relative to one another, in order to provide a seal between a cavity situated between the two members and the external ambient surrounding said cavity, having a first and a second annular elements apt to be mounted on the said members, in which a third deformable annular element rigidly connected to said second element is provided with an annular lip and with an annular projection extending in a radial direction and substantially perpendicular to the lip, arranged to slide with a predetermined pressure on a first and a second surface of the said first element under the action of a resilient element housed in a seating of the third element.

Abstract: A sealing connection for the passage of a fluid control line through adjoining members. The connection comprises a metallic tubular sealing element (10) provided with tapered end portions, each end having internal frusto-conical surfaces (32, 33) and external frusto-conical surfaces (41,43) in coaxial alignment with the bore (31) through the element (10). The external frusto-conical surfaces (41, 43) provide metal-to-metal sealing with aligned frusto-conical seating surfaces (62, 54) in opposed pockets (51, 61) formed in aligned portions (28a, 29) of the control line at their respective openings at the adjoining surfaces of the adjoined member (13, 12).

Abstract: A sealing device for a high-vacuum closure, such as used in a high-vacuum valve, where the surfaces effecting the seal are formed of metal. In forming the seal, a sealing member extends between and into contact with a pair of laterally spaced sealing surfaces. The surfaces on the sealing member which contact the sealing surfaces are rounded and have a radius of curvature equal to half the dimension of the sealing member between the sealing surfaces when it first contacts the surfaces during the closing step. The sealing surfaces can be frustoconical or spherical. When the device is closed, sealing force presses the sealing member between the sealing surfaces so that a relative rolling action takes place. Only elastic deformation occurs when the seal is effected.

Abstract: A seal for use with pipes to be inserted one into another with spigot and socket ends, comprising a sealing sleeve made of an elastomeric material and arranged in the socket, wherein the sleeve is provided with a radially resilient element, the arrangement being such that, after being mounted in the socket, the seal is clamped in the socket by the radial resilience of said element.

Abstract: Disclosed is a method and apparatus for positioning a pair of opposed brush assemblies in a gap defined by end baffles between process chambers. The brushes have a plurality of offset bristle clusters secured to a header, and the header is preferably angled so that the brushes will have a wiping action as a workpiece such as the printed circuit board passes between the bristles. A pair of brushes are employed with the opposed ends in overlapping relationship providing a wiping-type gate, and which permits the entrained fluid to drip down the bristle hairs and into the chamber from which the workpiece such as a printed circuit board is being removed. Optionally the brush bristles can be angled upwardly to incite a gravity assist for the entrained fluid dripping down toward the header of the brush and into the process tank.