Method of making mat type floor switches

Claim 1

THE PROCESS OF MAKING PRDESTRAN WEIGHT-OPERATED MAT SWITCHES OF THE TYPE IN WHICH A PAIR OF LARGE AREA SWITCH PLATES ARE SPACED APART AND ENCAPSULATED WITHIN A PLASTIC SUBSTANCE WHICH HAS A RESILIENT ELASTOMER STATE WHICH ADHERES TO METAL SURFACES WHEN CURED AND A LIQUID STATE PRIOR TO CURING; WHICH COMPRISES STACKING A PAIR OF ALIGNED FLEXIBLE METAL PLATES OF SUBSTATIALLY IDENTICAL SIZE AND SHAPE SPACED SLIGHTLY APART AT THEIR EDGES ALL THE WAY AROUND THE PERIPHERIES OF SAID PLATES BY AN INTERVENING NARROW BARRIER STRIP; SAID BARRIER STRIP BEING RESISTANT TO COMPRESSION AND EXTRUSION AND FORMED OF A PLIABLE, BIBULOUS, ELECTRICALY INSLATING MATERIAL WHICH HAS A HIGH DEGREE OF ABSORBENCY FOR THE LIQUID PLASTIC SUBSTANCE, AND WHICH IS SUBSTANTIALLY UNAFFECTED BY THE LIQUID PLASTIC SUBSTANCE OR THE CURING STEP FOR SAID PLASTIC SUBSTANCE; FORMING A SUBASSEMBLY BY LIGHTLY CLAMPING THE PLATE EDGES AGAINST THE INTERVENING BARRIER STRIP BY PRESSING A CHNNEL STRIP OVER THE EDGES OF SAID PLATES SO AS TO ENCLOSE AND PARTIALLY SEAL THE PLATE EDGES TO PROVIDE LIMITED LIQUID ACCESS TO THE BARRIER STRIP EXTERNAL EDGE, SUPPORTING SAID SUBASSEMBLY IN A MOLD CAVITY PROVIDING CLEARANCE AROUND SAID SUBASSEMBLY, FILLING SAID CAVITY WITH THE PLASTIC SUBSTANCE INTHE LIQUID STATE SO AS TO SUBMERGE THE PLATES AND CHANNEL STRIP WITHIN THE LIQUID PLASTIC MASS, A MINOR PORTION OF THE LIQUID PLASTIC SUBSTANCE IN THE MOLD SEEPING THROUGH THE PARTIAL SEAL BETWEEN THE CHANNEL STRIP AND THE PLATE EDGES AND BEING ABSORBED BY THE BIBULOUS BARRIER STRIP, AND SUBSEQUENTLY CURINGALL OF HTE LIQUID PLASTIC SUBSTANCE TOGETHER TO THE RESILIENT STATE, THE ABSORBED PLASTIC MATERIAL AFTER CURING ACTING TO BOND THE PLASTE TO EACH OTHER AND TO THE BARRIER STRIP, WHEREBY IN THE CURED ASSEMBLY THE PLATES ARE SPACED APART AND SECURED TOGETHER AT AND NEAR THEIR EDGES BY THE PLASTIC SUBSTANCE REINFORCED BY THE BARRIER STRIP SUBSTANCE AND THE PLATES ARE COMPLETELY ENCLOSE WITHIN THE MASS OF PLASTIC SUBSTANCE IN THE RESILIENT ELASTOMER STATE.