Variable electrical resistance device

Claim 1

IN A VARIABLE ELECTRICAL RESISTANCE DEVICE, A HOUSING HAVING A SIDE WALL AND OPPOSED END WEB PORTIONS AND A RESISTANCE COMPONENT MOUNTED FOR ROTATION WITHIN SAID HOUSING COMPONENT; SAID RESISTANCE COMPONENT COMPRISING A CYLINDRICAL BODY HAVING AXIALLY ALIGNED BEARING JOURNALS AT THE OPPOSITE ENDS THEREOF ROTATABLY MOUNTED IN BEARINGS FORMED IN SAID HOUSING END WEB PORTIONS, RESISTANCE MEANS ON SAID CYLINDRICAL BODY COMPRISING AT LEAST ONE LENGTH OF WIRE CLOSELY WOUND THEREON THE ADJACENT CONVOLUTIONS OF SAID WIRE BEING INSULATED FROM ONE ANOTHER AND THE OUTER SURFACE OF SAID LENGTH OF WIRE BEING UNINSULATED AND THE ADJACENT CONVOLUTIONS OF SAID WIRE FORMING A HELICAL GROOVE ON THE EXTERIOR OF SAID RESISTANT COMPONENT, MEANS FOR ELECTRICALLY CONNECTING SAID RESISTANCE MEANS IN AN ELECTRICAL CIRCUIT COMPRISING AT LEAST ONE SLIP RING FIXED TO ONE END OF SAID CYLINDRICAL BODY IN COAXIAL RELATION THERETO AND ELECTRICALY CONDUCTIVELY CONNECTED TO ONE END OF SAID WIRE, AND A STATIONARY BRUSH ELEMENT CARRIED BY SAID HOUSING INCLUDING A CONTACT PORTION MAINTAINED IN YIELDING CONTACT WITH SAID SLIP RING AND ANOTHER PORTION EXTENDING THROUGH A WALL OF SAID HOUSING FOR CONNECTION IN AN ELECTRICAL CIRCUIT, A MOVABLE BRUSH COMPONENT MEANS CARRIED BY SAID HOUSING AND INCLUDING MEANS EFFECTING BOTH ELECTRICAL CONDUCTIVE CONNECTION WITH SAID UNINSULATED SURFACE OF SAID RESISTANCE WIRE AND MECHANICAL ENGAGEMENT WITH SAID HELICAL GROOVE, A BUS BAR WITHIN SAID HOUSING DISPOSED PARALLEL TO AND SUBSTANTIALLY LONGITUDINALLY COEXTENSIVE WITH SAID RESISTANCE COMPONENT ON WHICH SAID BRUSH COMPONENT IS SLIDABLE, AND MEANS ON THE EXTERIOR OF SAID HOUSING FOR EFFECTIVE ROTATION OF SAID RESISTANCE COMPONENT WITH RESULTANT MOVEMENT OF SAID BRUSH COMPONENT ALONG SAID BUS BAR BY REASON OF SAID MECHANICAL ENGAGEMENT OF SAID BUSH COMPONENT WITH SAID HELICAL GROOVE, SAID HOUSING COMPLETELY ENCLOSING SAID RESISTANCE COMPONENT AND BEING RORMED OF INTERFITTING PARTS EACH INCLUDING A PORTION OF BOTH END WEB PORTIONS SO SHAPED AS TO COMBINE TO FORM SAID BEARINGS FOR SAID JOURNALS WHEREBY ASSEMBLY OF SAID HOUSING SIMULTANEOUSLY ENCLOSES SAID RESISTANCE COMPONENT AND THE CONTACT PORTIONS OF SAID BRUSHES AND MOUNTS SAID RESISTANCE COMPONENT FOR ROTATION WITHIN SAID HOUSING ON SAID BEARINGS AND SAID BUS BAR AND SAID BRUSH COMPONENT BEING WHOLLY MOUNTED ON ONE OF SAID HOUSING PARTS.