Abstract: A conveyor roller assembly comprising a supporting bracket through which the roller assembly can be fixed in use, a hollow, generally cylindrical roller shell supported for rotation about its longitudinal axis on the bracket, an electrical generator housed within the roller shell and driven thereby by rotation of the shell to produce an electrical output, a brake within the roller shell and operable to brake rotation of the shell relative to the bracket, a speed sensor within the shell for sensing the speed of rotation of the shell relative to the bracket, and, an actuator powered by the electrical output of the generator when the speed sensor detects that the speed of rotation of the shell relative to the bracket exceeds a predetermined value, to effect operation of the brake to brake rotation of the shell.

Abstract: A conveyor roller assembly comprising a supporting bracket through which the roller assembly can be fixed in use, a hollow, generally cylindrical roller shell supported for rotation about its longitudinal axis on said bracket, an electrical generator housed within said roller shell and driven thereby by rotation of the shell to produce an electrical output, a brake within said roller shell and operable to brake rotation of said shell relative to said bracket, a speed sensor within said shell for sensing the speed of rotation of said shell relative to said bracket, and, an actuator powered by the electrical output of said generator when said speed sensor detects that the speed of rotation of said shell relative to said bracket exceeds a predetermined value, to effect operation of said brake to brake rotation of the shell.

Abstract: An RF communications system assures selection of the optimum frequency for establishing a communications path between two stations by employing scanning transceivers which may be operated on a plurality of channels having programmed frequencies wherein the programmed frequencies in one transceiver may be automatically changed from another transceiver after establishing a communications path over one of the channels and, when calling another transceiver, the calling transceiver automatically reverts to the same channel last used for communications contact with the called transceiver.