Electric strip heater

Claim 1

AN ELECTRICALLY ENERGIZABLE STRIP HEATER UNIT FOR HEATING A MOVING WEB COMPRISING (A) A LONG, NARROW, THIN METAL CONDUCTOR STRIP OF HIGH ELECTRICAL RESISTIVITY, HIGH ELASTIC LIMIT CAPABLE OF THERMAL ELONGATION AND HAVING DEPENDING LENGTHWISE SIDES; (B) A THERMALLY AND ELECTRICALLY INSULATING SUPPORT FOR SAID STRIP HAVING A RECESSED AREA OR AREAS OF SMALL CROSS-SECTION EXTENDING DOWNWARDLY FROM THE SURFACE OF THE SUPPORT AND INTERFITTING WITH A DEPENDING SIDE OR SIDES OF THE STRIP; THE HEATER UNIT BEING FURTHER CHARACTERIZED BY HAVING (1) THE BOTTOM SURFACE OF THE STRIP BEING IN ENGAGEMENT WITH THE TOP SURFACE OF THE SUPPORT; (2) THE STRIP BEING CONNECTED TO A SOURCE OF ELECTRICAL ENERGY SO THAT THE STRIP WILL BE HEATED BY THE PASSAGE OF ELECTRICAL CURRENT; (3) THE SUPPORT AND STRIP BEING DISPOSED ADJACENT THE PATH OF THE WEB; (4) THE LENGTHWISE AXIS OF THE STRIP EXTENDING ACROSS THE PATH OF THE WEB AND AT RIGHT ANGLES TO THE AXIS OF THE WEB TRAVEL; (5) ONE END OF THE STRIP BEING FASTENED TO THE SUPPORT; (6) A LENGTHWISE EDGE OF THE STRIP OR OF AN ADJACENT SURFACE OF THE SUPPORT, DOWNSTREAM FROM THE PATH OF THE WEB, SERVING AS A STRAIGHT EDGE FOR GUIDING A WEB AS IT PASSES FROM THE UNIT AT AN ANGLE FROM THE SURFACE OF THE SUPPORT; AND (7) THE ADJOINING UPPER SURFACES OF THE STRIP AND THE SUPPORT BEING IN SUBSTANTIALLY THE SAME PLANE.