Abstract: A portable conveyor cleaning assembly with adjustable first and second end assemblies selectively mountable on respective sides of different width conveyors. A carriage is movable reciprocally over the conveyor to direct a cleaning fluid onto the conveyor, with the degree of reciprocal movement being adjustable to suit a particular conveyor.

Abstract: A post and rail assembly comprising a rail having one end of a flexible tether secured thereto, and a post provided with an aperture through which the flexible tether can be passed. The other end of the tether is provided with an enlarged head which in at least one orientation with respect to the aperture is incapable of passing therethrough. A locking element is releasably engageable with the post to restrict the aperture and prevent both passage of the enlarged head therethrough and removal of the end of the tether therefrom.

Abstract: An adaptor in combination with a supporting container, the adaptor comprising support means for a lamp unit or other warning mechanism and the supporting container having an open end into which a portion of the adaptor normally located beneath the support means can be inserted. A locking device comprising engageable elements is provided on the aforesaid portion of the adaptor and the interior of the supporting container such that the elements engage one with another some distance within the container from the open end when the unit is inserted so as to prevent removal of the unit. The locking device is arranged to be unlocked by a key insertable into the tubular container to cause disengagement of the engaged elements one from another so that the unit can be removed.