Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
138 words
In a method for producing a ceramic insulator having a length-to-diameter ratio greater than 3:1 and at least two bores extending generally longitudinally of the insulator, said method comprising charging ceramic batch into a longitudinally extending die with stepped arbors supported therein by a plunger to form each of the bores, pressing the batch in the die between the arbor plunger and an opposing plunger, ejecting the blank and removing the arbors therefrom, contouring the blank to desired shape, and firing the contoured blank, the improvement of controlling the relative motion of the opposing plungers with respect to the longitudinal wall of the die while pressing the blank so that at least 80 percent of the total plunger movement is in the direction of decreasing arbor diameter whereby variations in the end-to-end density of the insulator are minimized.
Claim 2
Dependent Claim
138 words
In a method for producing a ceramic insulator having a length-to-diameter ratio greater than 3:1 and at least two bores extending generally longitudinally of the insulator, said method comprising charging ceramic batch into a longitudinally extending die with stepped arbors supported therein by a plunger to form each of the bores, pressing the batch in the die between the arbor plunger and an opposing plunger, ejecting the blank and removing the arbors therefrom, contouring the blank to desired shape, and firing the contoured blank, the improvement of controlling the relative motion of the opposing plungers with respect to the longitudinal wall of the die while pressing the blank so that at least 80 percent of the total plunger movement is in the direction of decreasing arbor diameter whereby variations in the end-to-end density of the insulator are minimized.
Claim 3
Dependent Claim
86 words
In a method as claimed in claim 1, the improvement wherein from 80 percent to 90 percent of the plunger movement is in the recited direction, the longitudinal surface of the blank prior to firing is contoured generally as a solid of revolution about its longitudinal axis and the transverse diameter along the longitudinal surface of the blank is controlled so that it is greater than that desired after firing by a percentage which varies as an inverse function of the green, or unfired end-to-end density.
Claim 4
Dependent Claim
23 words
In a method as claimed in claim 1, the improvement wherein the said ceramic insulator has a length-to-diameter ratio not greater than 8:1.
Claim 5
Dependent Claim
133 words
In a method for producing a ceramic insulator having a length-to-diameter ratio greater than 3:1 and at least two bores extending generally longitudinally of the insulator, said method comprising charging ceramic batch into a longitudinally extending die with arbors supported therein by a plunger to form each of the bores, pressing the batch between opposing plungers, ejecting the blank, contouring it to the desired shape, and firing the contoured blank, the improvement wherein the longitudinal surface of the blank prior to firing is contoured generally as a solid of revolution about its longitudinal axis and the transverse diameter along the longitudinal surface of the blank is controlled so that it is greater than that desired after firing by a percentage which varies as an inverse function of the green or unfired end-to-end density.
Claim 6
Dependent Claim
133 words
In a method for producing a ceramic insulator having a length-to-diameter ratio greater than 3:1 and at least two bores extending generally longitudinally of the insulator, said method comprising charging ceramic batch into a longitudinally extending die with arbors supported therein by a plunger to form each of the bores, pressing the batch between opposing plungers, ejecting the blank, contouring it to the desired shape, and firing the contoured blank, the improvement wherein the longitudinal surface of the blank prior to firing is contoured generally as a solid of revolution about its longitudinal axis and the transverse diameter along the longitudinal surface of the blank is controlled so that it is greater than that desired after firing by a percentage which varies as an inverse function of the green or unfired end-to-end density.