Abstract: Composite brake disc, comprising cast iron carrier disc (1) and at least one friction ring (2) of the different material rigidly joined therewith, which covers over essentially the area opposite to the brake pad, wherein the friction ring (2) is comprised of a friction material, which exhibits a higher corrosion resistance than the cast iron carrier disc (1), and process for production of a composite brake disc by joining a cast iron carrier disc (1) with at least one friction ring (2) by friction welding or by casting the carrier disc (1) thereon.

Abstract: The invention provides a connector for a rotatable lawn sprinkler mounted on a cylindrical stand pipe, and comprises two cylindrical members arranged co-axially with respect to the longitudinal axis of the stand pipe. A cylindrical sleeve, as the female member of the connector, has an open-ended longitudinal bore and terminates at one end with an outwardly extending annular shoulder seated on the marginal wall of the stand pipe and is secured thereto. A cylindrical stem, as the male member of the connector, having an open-ended longitudinal bore and terminates near one end with an outwardly extending annular collar is co-axially disposed and slidably engagable with the sleeve so as to be freely rotatable in the bore of the sleeve. The annular collar of the stem is supportably engaged with the annular shoulder of the sleeve. The upper section of the stem is adaptable for secure engagement with the rotatable lawn sprinkler.