Gearshift knob joining arrangement

摘要

An arrangement for readily joining a plastic handgrip knob to a metal gearshift rod in a positive non-slip manner. The handgrip includes a plastic core member molded with an axial blind bore defining a linear key therein extending a predetermined axial distance from the upper terminus at the bore closed end to its lower terminus spaced from the bore open end. The junctures of the key sides with the internal surface of the bore define a pair of fillets coextensive with the key with the fillets being tapered from a maximum chordal distance at the key lower terminus to minimum chordal distance at the bore closed end. The rod is formed with a keyway extending from the rod upper end a predetermined distance sufficient to receive the key therein. The keyway junctures between its sides and the rod cylindrical surface define a pair of linear sharpened cutting edges adapted to deform and cut their associated fillets thereby tightly wedging and joining the plastic key in the keyway obviating relative rotational movement therebetween. The core member includes a pair of integral apertured leaf springs adapted to snappingly engage the ends of a rod crosspin to axially retain the handgrip on the rod.