Abstract: A trigger adaptor allowing a conventional pistol-grip type hand held power tool to be used when suspended pointing vertically downwards, so that the operator may grip the tool and position it where desired and still be able to actuate the tool trigger. The adaptor includes a tubular grip surrounding the tool barrel and freely rotatable around it. The grip extends between upper and lower annular securing parts each of which is secured to the tool barrel. A longitudinal groove in the grip carries an auxiliary trigger bar pivoted at a lower end thereof on a pin. When the trigger bar is squeezed inwardly, its upper end bears on the underside of a flange at the top of a tube. When the flange rises it drives up a pushrod, which contacts the tool trigger and moves it to actuate the tool.

Abstract: A riveting tool of the kind having an elongate, headed, mandrel on which a plurality of tubular rivets are supported as a column, and which can be gripped and reciprocated relative to an abutment by reciprocable gripping jaws so as to draw the head of the mandrel through each rivet supported in turn by the abutment, and having a mechanism for feeding the column of rivets towards the head of the mandrel, has both the rivet feeding mechanism and the gripping of the mandrel by the jaws operated pneumatically, each respectively being under the control of a manually operable valve. In order to avoid the possibility of the feeding mechanism being actuated at a time when the mandrel is not gripped by the jaws, the valves are interengaged with a detent arranged to prevent opening of the valve which controls the rivet feeding mechanism when the valve which controls the jaws is closed.

Abstract: Data processing equipment suitable for recording details of manually connected telephone calls has a plurality of operator stations with keyboards and VDU's connected in groups to operator's control units which respond to keyed instructions to obtain data from peripheral units storing such data and for recording on magnetic tape cartridge the details of the calls. Each operator's control unit is connected to eight operator stations but is capable of handling inputs from twelve such stations. In the event of breakdown of an operator's control units the eight stations allocated to it are divided into two groups of four which are transferred to the two control units adjacent to that which has broken down. Among the criteria used to determine whether a control unit has broken down are the filling of buffer stores and the failure to perform a particular operation within a predetermined interval of time following the previous performance of that operation.