Abstract: Prior latches for sliding doors typically lock only from the inside of the door. The present invention provides a lock and latch system which allows the sliding door to be locked using a key from inside or outside the door, allowing the home owner to prevent unauthorized access by the picking of the external lock or breaking of the glass door and releasing of the lock from the inside. This is accomplished by providing a lock and latch in which the latch hook is rotated either by an internal handle or an external key. A rotating lug member, which is rotated from the interior by a key, can be engaged to block rotation of the latch.

Abstract: A lance for injecting a powdery material together with a carrier gas in metal melts such as liquid steel. The lance consists of a tubular body with an inner pipe bore having an inlet end and an outlet end for transport of powder through the tube. The lance has at least one outlet duct arranged adjacent the lower end for conducting powder from the pipe bore to the outside of the lance, said duct forming an angle of less than 90.degree. with the axis of the lance and being directed slopingly outwards/downwards from the bore towards the lance tip. The outlet duct or ducts are arranged in a nozzle contiguous to the tip of the lance, said tip being formed by a ceramic body intended for abutment against the bottom or wall in a ladle. In the outlet end of the pipe bore there is arranged a distributing means with a conical end adjacent the inlet openings of the outlet duct or ducts, for uniform distribution of the powdery material thereto.