Method for producing grooved molded parts

Claim 1

A METHOD OF PRODUCING MOLDED PARTS HAVING RECESSES IN THEIR LATERAL SIDES COMPRISING THE STEPS OF FILLING A MIXTURE OF A FINELY SHREDDED ORGANIC FIBROUS MATERIAL AND A HEAT SETTING BINDER INTO THE OPEN UPPER SIDE SUBSTANTIALLY TO THE LEVEL OF THE UPPER END OF A MOLD CAVITY IN AN AMOUNT RANGING FROM 4-1 TO 10:1 OF THE SIZE OF THE MOLDED PART, SAID CAVITY DEFINED BY A STATIONARY BOTTOM AND SIDE WALLS HAVING A SHAPE AND CAPACITY IN PROPORTION TO THE SIZE, SHAPE AND COMPRESSIVE STRENGTH OF THE PART TO BE MOLDED, AND AT LEAST ONE OF SAID SIDE WALLS COMPRISING A MEMBER MOVABLE VERTICALLY TO SAID BOTTOM AND HAVING A PRIJECTION EXTENDING INTO SAID MOLD CAVITY AND OF A SIZE AND SHAPE IN ACCORDANCE WITH THE SIZE AND SHAPE OF A RECESS TO BE MOLDED IN SAID PART, MOVING AN UPPER DIE INTO THE OPEN SIDE OF SAID MOLD CAVITY FOR A CERTAIN DISTANCE IN THE DIRECTION TOWARD SAID BOTTOM AND TO A CERTAIN LEVEL ABOVE SAID PROJECTION AND THEREBY COMPRESSING SAID MIXTURE IN SAID MOLD CAVITY AND AROUND SAID PROJECTION, AND THEN CONTINUING TO MOVE SAID UPPER DIE DOWNWARDLY AND SIMULTANEOUSLY AND EQUALLY MOVING SAID MEMBER WITH SAID PROJECTION THEREON FOR A DISTANCE SUBSTANTIALLY EQUAL TO SAID FIRST DISTANCE, WHEREBY SAID MIXTURE IS COMPRESSED TO THE SIZE, SHAPE, AND COMPRESSIVE STRENGTH OF THE DESIRED MOLDED PART AND A RECESS IS MOLDED BY SAID PROJECTION IN SAID MOLDED PART, THE AREA AT BOTH SIDES OF SAID RECESS THEN HAVING A COMPRESSIVE STRENGTH HIGHER THAN THAT OF THE OTHER AREAS OF SAID MOLDED PART.

Claim 2

A METHOD OF PRODUCING MOLDED PARTS HAVING RECESSES IN THEIR LATERAL SIDES COMPRISING THE STEPS OF FILLING A MIXTURE OF A FINELY SHREDDED ORGANIC FIBROUS MATERIAL AND A HEAT SETTING BINDER INTO THE OPEN UPPER SIDE SUBSTANTIALLY TO THE LEVEL OF THE UPPER END OF A MOLD CAVITY IN AN AMOUNT RANGING FROM 4-1 TO 10:1 OF THE SIZE OF THE MOLDED PART, SAID CAVITY DEFINED BY A STATIONARY BOTTOM AND SIDE WALLS HAVING A SHAPE AND CAPACITY IN PROPORTION TO THE SIZE, SHAPE AND COMPRESSIVE STRENGTH OF THE PART TO BE MOLDED, AND AT LEAST ONE OF SAID SIDE WALLS COMPRISING A MEMBER MOVABLE VERTICALLY TO SAID BOTTOM AND HAVING A PRIJECTION EXTENDING INTO SAID MOLD CAVITY AND OF A SIZE AND SHAPE IN ACCORDANCE WITH THE SIZE AND SHAPE OF A RECESS TO BE MOLDED IN SAID PART, MOVING AN UPPER DIE INTO THE OPEN SIDE OF SAID MOLD CAVITY FOR A CERTAIN DISTANCE IN THE DIRECTION TOWARD SAID BOTTOM AND TO A CERTAIN LEVEL ABOVE SAID PROJECTION AND THEREBY COMPRESSING SAID MIXTURE IN SAID MOLD CAVITY AND AROUND SAID PROJECTION, AND THEN CONTINUING TO MOVE SAID UPPER DIE DOWNWARDLY AND SIMULTANEOUSLY AND EQUALLY MOVING SAID MEMBER WITH SAID PROJECTION THEREON FOR A DISTANCE SUBSTANTIALLY EQUAL TO SAID FIRST DISTANCE, WHEREBY SAID MIXTURE IS COMPRESSED TO THE SIZE, SHAPE, AND COMPRESSIVE STRENGTH OF THE DESIRED MOLDED PART AND A RECESS IS MOLDED BY SAID PROJECTION IN SAID MOLDED PART, THE AREA AT BOTH SIDES OF SAID RECESS THEN HAVING A COMPRESSIVE STRENGTH HIGHER THAN THAT OF THE OTHER AREAS OF SAID MOLDED PART.