135results about How to "Avoid excessive friction" patented technology

A substrate, such as a catheter or a guide wire, or a portion of the substrate is provided with a lubricous, hydrophilic abrasion-resistant coating by: (a) coating the substrate with a first aqueous coating composition having an aqueous dispersion or emulsion of a polymer having organic acid functional groups and a polyfunctional crosslinking agent having functional groups capable of reacting with organic acid groups, and drying the coating to obtain a substantially water-insoluble coating layer having excess polyfunctional including functional groups being reactive with organic acid groups remaining; and (b) contacting the dried water-insoluble coating layer with a second aqueous coating composition having an aqueous solution or dispersion of a hydrophilic polymer having organic acid functional groups, a polymer having organic acid functional groups and a polyfunctional crosslinking agent having functional groups capable of reacting with organic acid groups, and drying the combined coating to form an intermediate coating, whereby the polymer and the hydrophilic polymer of the second composition become bonded to the polymer of the first coating composition through the excess crosslinking agent; and (c) contacting the dried intermediate coating with a third aqueous coating composition having an aqueous solution or dispersion of a hydrophilic polymer having organic acid functional groups, and drying the combined coatings, the hydrophilic polymer of the third coating composition thereby becoming bonded to the polymers of the second coating composition through the excess crosslinking agent. The dryings can be carried out at ambient (room) temperature.

A mold for molding a tread of rubber mix, this tread comprising a running surface delimited axially by lateral faces, this mold comprising (i) a central part for molding the running surface, movable between an open configuration allowing filling of the mold and a closed configuration allowing molding, the central part comprising at least one rib for molding a groove in the running surface; (ii) two lateral parts for molding the lateral faces, at least one of the lateral parts being axially movable relative to the central part; et (iii) at least one pin for molding a channel inside the tread, this pin being anchored in one of the lateral parts; and in which, when the mold is closed, a contact surface is formed between the pin and the rib, and the pin and / or the rib comprise a buffer made of a deformable material, deformation of which makes it possible to fill in the clearance between the pin and the rib at the contact surface when the mold is closed.

A free piston engine has a pair of opposed cylinders on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each in a respective one of the cylinders, with a push rod connected therebetween. The push rod forms a fluid plunger. An outer piston assembly includes a pair of outer pistons, one each in a respective one of the cylinders, with a pull rod connected therebetween. The pull rod forms a fluid plunger. The movement of the inner and outer piston assemblies during engine operation will cause the fluid plungers to pump fluid from a low pressure container into a high pressure chamber as a means of storing the energy output. A hydraulic coupler synchronizes the inner and outer piston assemblies.

A cutting element for use in drilling subterranean formations. The cutting element includes a superabrasive table mounted to a supporting substrate. The superabrasive table includes a two-dimensional cutting face having a cutting edge along at least a portion of its periphery, and a surface comprising a chamfer extending forwardly and inwardly from proximate a peripheral cutting edge at a first acute angle of orientation of greater than about 45° with respect to the longitudinal axis of the cutting element, and to no greater than a selected depth. The chamfer may be arcuate or planar, and of a dimension sufficient to ensure that a wear flat generated during use of the cutting element remains outside the inner boundary of the chamfer within the chamfer envelope, and small enough to maintain aggressive cutting characteristics for the cutter. Drill bits and drilling tools bearing the cutting elements are also disclosed.

A coupler for a spiral membrane filtration element having a spiral membrane enclosed within a rigid outerwrap includes a center support, a plurality of spokes extending outwardly from the center support, a circular rim coupled with the spokes, with the face of the rim being perpendicular to the axis of the overwrap. The rim includes a channel on its face for receiving a compressible seal, and a plurality of receptacles around its outer surface for joining two face-to-face adjacent couplers when a pair of aligned keepers is place in each receptacle. Exemplary embodiments of the coupler and filtration elements and filtration assemblies are provided, as well as an associated method.

A free piston engine is configured with a pair of opposed engine cylinders located on opposite sides of a fluid pumping assembly. An inner piston assembly includes a pair of inner pistons, one each operatively located in a respective one of the engine cylinders, with a push rod connected between the inner pistons. The push rod extends through an inner pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. An outer piston assembly includes a pair of pistons, one each operatively located in a respective one of the engine cylinders, with at least one pull rod connected between the outer pistons. The pull rod extends through an outer pumping chamber in the fluid pumping assembly and forms a fluid plunger within this chamber. The movement of the inner and outer piston assemblies during engine operation will cause the fluid plungers to pump fluid from a low pressure container into a high pressure chamber as a means of storing the energy output from the engine. Alternatively, the piston assemblies may drive a linear alternator. Located adjacent to at least one of the pistons are oil holes, with an oil mist annulus supplying oil mist therethrough. The oil in the oil mist will lubricate the engine cylinder wall while minimizing the oil consumption of the engine.