Abstract: An economical to manufacture and simple to install and remove gas charged fluid pressure accumulator including a cup-shaped accumulator body with an integral dome at one end and an integral in-turned annular lip at the other end, a piston slidably disposed in the accumulator body, and an external screw thread on the accumulator body. The accumulator body is screwed into a threaded counterbore until the annular lip bears against a bottom wall of the counterbore with a fluid port of the manifold inside of the projection of the lip on the bottom wall. A seal ring in a groove in the bottom wall of the counterbore bears against the annular lip to seal the chamber of the accumulator defined between the bottom wall and the piston.

Abstract: A curtain rail consists of a number of interconnected lengths of extruded aluminium support rail of inverted channel section with inwardly projecting ribs at the mouth of the channel section. In the installed curtain rail, the ribs are embraced by one-piece or continuous plastics glide tracks engaged by necked nylon runners. The cross-sectional configurations of the ribs and the tracks are mutually complementary so that the tracks can be press-fitted manually and are self-retaining. The preferred track is a P.V.C. extrusion of C-shaped section. The arrangement provides, conveniently and economically, the advantage of easy handling and transporting associated with multi-piece support rail, coupled with the advantage of quiet click-free operation.