Abstract: A pressing tool for fastening a seal 6 in a groove 5 of a support body is a rotatable holder 12 carrying ball rollers 22. A lip 4 forms a wall of the groove 5. The ball rollers are moved in a circular path along the lip 4 to press the lip 4 so as to grip the seal 6 in the groove 5.

Abstract: A shaft seal comprises a resilient sealing ring 1 with a peripheral sealing lip which is deflected axially in use so as to bear radially against a shaft. The sealing contact area 2 on the sealing lip is between predetermined limits, each defined by a change in angle of the surface of the sealing lip so that a substantial contact stress is maintained across the whole sealing contact area 2 in use. The seal can be used in an assembly including a carrier 5, 5' in which the seal is mounted. The seal can be used cooperatively with another shaft seal to prevent contaminants passing along the shaft.

Abstract: A thread seal comprises a helical rib (6) for use with a threaded member (1). The end portions (7) of the rib (6) are axially staggered and are joined by a transverse thread bridging member (8) which engages a crest (9) of the thread between successive turns of the groove (2). The rib (6) has a tapering cross-section to project radially into the groove (2) and to form a lip seal over a limited axial width of the groove (2) throughout the greater part of the circumferential length of the rib (6). The end portions (7) together with the bridging member (8) are shaped to form a seal over the full axial width of the thread profile. By limiting the area of contact between the rib (6) and groove (2) over the greater part of the circumferential length of the rib (6) the frictional force between them is reduced.

Abstract: A sealing assembly comprises a resilient sealing element (1), possibly substantially T-shaped in cross-section, with a horizontal top portion (2) and a vertical portion (3) depending from the top portion and possessing a rounded sealing lip (4) at an end remote from the top portion (2). The assembly also comprises supporting elements (5) of substantially non-resilient material positioned one on each side of the vertical portion (3) characterized in that the surface of the sealing lip (4) is less rounded than semi-circular when in a non-deflected condition. Opposed sides of the vertical portion (3) meet the surface of the sealing lip (4) at turning points (T, P), and the surface of the sealing lip between these turning points preferably lies within semi-ellipses whose minor radii (B) are from 30% to 80% of the major radii (A) extending between the turning points (T, P).

Abstract: A syringe comprising a barrel with means for positioning a needle at a forward end thereof, a plunger displaceable within the barrel, sealing means to maintain the integrity of a dispensing chamber forwardly of the barrel, wherein the plunger has associated disabling means to render the sealing means ineffective after a first use of the syringe.

Abstract: A method of manufacturing a seal which involves printing seal material onto a substrate by printing a first layer of seal material onto the substrate with a stencil, printing a subsequent layer of seal material onto the substrate with a further stencil, and curing or partially curing the seal material, wherein the further stencil has a recess formed therein which accommodates the first layer of seal material printed onto the substrate.

Abstract: A sealing assembly, suitable for sealing between two relatively-slidable parts, includes a sealing ring which is housed in an annular groove in one of the parts, which is formed with two circumferential lip portions and which is formed with a circumferential landed portion disposed between those portions. Elastomeric energizing means, also in the grooves and in engagement with the sealing ring, urges the lip portions into fluid sealing engagement with the other of the parts. The landed portion is, under conditions of low fluid pressure upon the assembly, free from fluid sealing engagement with the other part but, under conditions of high fluid pressure upon the assembly, is caused to come into fluid sealing engagement with the other part to supplement the sealing by the lip portions and to share with those portions contact stresses arising on relative movement of the two parts under high applied fluid pressure.

Abstract: A seal for use between two relatively-rotatable parts includes a sealing member of fluorine resin having a side which terminates in an edge and which has a plurality of recesses adjacent to and disposed about the edge. Each groove is in the form of a quadrilateral with two opposite sides substantially parallel to the edge, one being longer than, and closer to the edge than, the other, and each of the other two sides being inclined at an acute angle to the longer of the two parallel sides. In use the edge and at least part of the side adjacent the edge are engageable with one of the two relatively-rotatable parts.

Abstract: A seal or gasket having at least one aperture providing a fluid passageway and intended in use to be clamped by clamping means between surfaces of two parts to be sealed. The seal or gasket comprises conformable elastically-compressible material and relatively-incompressible material bonded therein. The relatively-incompressible material forms an extrusion-limiting barrier which extends at least part-way around the aperture, which is interrupted at intervals by portions of the elastically-compressible material and which is spaced from the aperture by a border portion wholly of the elastically-compressible material.

Abstract: An imperforate sheet of gasket material from which gaskets, for preventing leakage of fluid between opposed surfaces, can be made. The sheet, which may be produced by various methods, comprises a matrix of an elastically-compressible material and discrete volumes of substantially-rigid material so distributed therein that upon compressing the sheet between opposed surfaces, initially the matrix material solely resists compression and only thereafter do the discrete volumes also resist compression. The distribution is also such that the mean rate of compression over any area of the sheet is substantially the same as the mean rate of compression over another area of the sheet when the areas are similarly compressed. The discrete volumes form compression stops to resist undesirable over-compression of the sheet. Such a sheet has application in the automotive industry, gaskets made therefrom being particularly suitable for fluid-sealing in vehicle engines.

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.