Die attachment for forming split type fasteners on molded parts

Claim 2

In combination with die parts defining a die cavity, a die attachment for forming a split type fastener on a molded part, comprising a sleeve having a bore and an inner end facing the die cavity, a forming wedge carried by the inner end of said sleeve, a cap mounted on the inner end of said sleeve and holding said forming wedge in place, said cap having a bore for forming the outer surface of said fastener, said forming wedge extending into said cap bore for forming the slot of said fastener, and an ejector pin slidably mounted in said sleeve and movable between an outer position in which its end coacts with the surfaces of the cap bore, sleeve end and forming wedge to form a cavity for molding the fastener, and an inner position in which it ejects the molded fastener from the bore, the ejector pin having a slot for accommodating said forming wedge.

Claim 3

The combination according to claim 1, the inner end of said sleeve bore having a flared portion for forming a chamfer on said fastener.

Claim 4

The combination according to claim 1, said cap bore being slightly tapered so as to form a corresponding slight flare on said fastener.

Claim 5

The combination according to claim 3, said forming wedge being tapered whereby ejection of said fastener from said sleeve bore will be permitted.

Claim 6

The combination according to claim 1, said cap having an annular lip surrounding said bore, whereby a receSs will be formed at the base of said fastener.

Claim 7

The combination according to claim 1, the inner end of said sleeve having an externally threaded portion, and an internally threaded portion on said cap mountable on said sleeve.

Claim 8

An attachment for a die used to form a part having an integral split type fastener, comprising a bored sleeve of cylindrical shape with an inner portion of narrower diameter, the end of the sleeve bore within said inner portion being flared to form a chamfer on said fastener, a diametral slot in the inner end of said sleeve, a forming wedge having a mounting portion in said slot with a width equal to the diameter of said inner sleeve portion and a narrower wedge-shaped forming portion with shoulders between said portions, a cap engaging said shoulders to hold the forming wedge in place, said cap having a first bore portion secured on said inner sleeve portion and a forming bore portion of smaller diameter than said first bore portion, the forming portion of said wedge being disposed within said forming bore portion of the cap, the sides of said forming portion of the wedge engaging said forming bore portion of the cap with both having a slight taper, an annular lip on said cap surrounding said forming bore portion for creating a recess around the base of said fastener, and an ejector pin slidably mounted in said sleeve bore and movable between an outer position in which its end forms the end of the fastener cavity and an inner position ejecting the fastener, said ejector pin having a slot for accommodating said forming wedge.

Claim 9

An attachment for a die used to form a part having an integral split type fastener, comprising a bored sleeve of cylindrical shape with an inner portion of narrower diameter, the end of the sleeve bore within said inner portion being flared to form a chamfer on said fastener, a diametral slot in the inner end of said sleeve, a forming wedge having a mounting portion in said slot with a width equal to the diameter of said inner sleeve portion and a narrower wedge-shaped forming portion with shoulders between said portions, a cap engaging said shoulders to hold the forming wedge in place, said cap having a first bore portion secured on said inner sleeve portion and a forming bore portion of smaller diameter than said first bore portion, the forming portion of said wedge being disposed within said forming bore portion of the cap, the sides of said forming portion of the wedge engaging said forming bore portion of the cap with both having a slight taper, an annular lip on said cap surrounding said forming bore portion for creating a recess around the base of said fastener, and an ejector pin slidably mounted in said sleeve bore and movable between an outer position in which its end forms the end of the fastener cavity and an inner position ejecting the fastener, said ejector pin having a slot for accommodating said forming wedge.