Abstract: An improved hydraulic coupling includes a fitting and a nut that are threadably connectable together. The fitting includes a generally annular groove having a lateral frusto-conic engagement surface. The nut includes a plurality of elongated fingers that each include a projection having an outwardly-disposed edge. When the coupling is assembled, the edges are frictionally engaged with the engagement surface as a result of the elastic deflection of the fingers. The frusto-conic shape of the engagement surface provides progressively greater frictional resistance in a direction of unthreading of the coupling, whereby loosening of the coupling during operation of the fluid circuit is resisted.

Abstract: An improved hydraulic coupling includes a fitting and a nut that are threadably connectable together. The fitting includes a generally annular groove having a lateral frusto-conic engagement surface. The nut includes a plurality of elongated fingers that each include a projection having an outwardly-disposed edge. When the coupling is assembled, the edges are frictionally engaged with the engagement surface as a result of the elastic deflection of the fingers. The frusto-conic shape of the engagement surface provides progressively greater frictional resistance in a direction of unthreading of the coupling, whereby loosening of the coupling during operation of the fluid circuit is resisted.

Abstract: An apparatus for cooling a workpiece, especially a continuous rolled non-flat workpiece includes a cooling passage having an inlet for receiving the workpiece and an outlet for discharging the workpiece, the cooling passage having a central axis and further including an inlet for introducing a cooling medium to the cooling passage, and an outlet for removing the cooling medium from the cooling passage, the cooling medium inlet being arranged relative to the central axis of the cooling passage so as to induce a substantially helical flow of cooling medium around the central axis from the cooling medium inlet to the cooling medium outlet, the cooling medium outlet including a chamber having an expanded flow area, whereby pressure and velocity of the cooling medium in the cooling passage are controlled so as to provide accelerated cooling of the workpiece.