MY130482A - Clinch-type blind nut - Google Patents

Abstract

A THREADED BLIND INSERT (10) INCLUDES A SHANK (12) WITH AN AXIAL BORE (9) THERE THROUGH HAVING A HEAD (15) AT ONE END AND A THREADED REGION (13) OF THE BORE (9) AT THE OPPOSITE END.THE WALL OF THE SHANK (12) BETWEEN ITS OUTER SURFACE AND THE BORE (9) INCLUDES A WEAKENED DEFORMABLE PORTION CREATED BY A REDUCED OUTSIDE DIAMETER OF THE SHANK (12) IN THAT AREA. A REINFORCEMENT COLLAR (11) INTEGRAL WITH THE SHANK (12) IS LOCATED AT APPROXIMATELY THE MIDDLE OF THE DEFORMABLE PORTION OF THE SHANK (12) THUS PROVIDING A MORE RIGID AREA AT THE COLLAR (11) WHICH CREATES BULGES (25),(26) IN THE DEFORMABLE PORTION ON EITHER SIDE OF THE COLLAR (11) WHEN THE INSERT (10) IS COMPRESSED. A FLANGE (17) LOCATED ADJACENT THE UNDERSIDE OF THE HEAD (15) OF THE INSERT (10) HAS AN OUTER DIAMETER GREATER THAN THE SHANK (12) BUT LESS THAN THE HEAD (15). WHEN FITTED INTO A MOUNTING HOLE OF A WORK PIECE,THE FLANGE (17) CENTERS THE INSERT (10) AND PROVIDES AN ANNULAR GAP BETWEEN THE SHANK (12) AND THE MOUNTING HOLE. AS THE INSERT (10) IS COMPRESSED BY AN INSTALLATION TOOL, THE BULGES (25), (26) PROVIDE A REACTIVE FORCE AGAINST THE BACKSIDE OF THE WORKPIECE, WHICH CLAMPS THE WORK PIECE BETWEEN THEBULGES (25), (26) AND THE HEAD (15) OF THE INSERT (10). REACTION FORCES OF THE BULGES (25), (26) ARE SUFFICIENT TO EMBED THE HEAD (15) INTO THE PANEL (20) COMPLETELY SO THAT THE INSTALLATION PROVIDES A FLUSH ATTACHMENT. ALTERNATELY, THE REINFORCEMENT COLLAR (11) MAY BE REPLACED BY A BAND OF GREATER HARDNESS ON THE DEFORMABLE WALL, WHICH CAN BE CREATED BY HEAT TREATMENT.(FIG 6)