Abstract: A method of biasing a worm shaft of a motor assembly including the steps of: providing a motor assembly having a housing defining an inner chamber, an access aperture spaced therefrom, a shaft aperture in communication with both the chamber and access aperture, and a shaft rotatably supported by and at least partially disposed in the shaft aperture; providing an ultrasonic device having a horn for producing vibrations; providing a slug having a body defining a first shape for being disposed in the access aperture, transformable to a second shape whereby the slug melts in response to predetermined vibrations; placing the slug in the access aperture; actuating the ultrasonic device so as to transform the slug to the second shape such that the slug melts and at least partially flows into the shaft aperture to abut the terminal portion.

Abstract: A method of biasing a worm shaft of a motor assembly including the steps of: providing a motor assembly having a housing defining an inner chamber, an access aperture spaced therefrom, a shaft aperture in communication with both the chamber and access aperture, and a shaft rotatably supported by and at least partially disposed in the shaft aperture; providing an ultrasonic device having a horn for producing vibrations; providing a slug having a body defining a first shape for being disposed in the access aperture, transformable to a second shape whereby the slug melts in response to predetermined vibrations; placing the slug in the access aperture; actuating the ultrasonic device so as to transform the slug to the second shape such that the slug melts and at least partially flows into the shaft aperture to abut the terminal portion.

Abstract: A pulse actuated interlock mechanism for a vehicle that couples and uncouples a drive member and a driven member. A clutch member is slidably movable to couple or uncouple the drive and driven members. A latchable piston assembly in combination with a return spring is utilized to move the clutch member. A force of short duration of a first magnitude is applied to latch the piston assembly which permits the return spring to move the clutch member to uncouple the drive and driven members. A force of a short duration of a second magnitude which is greater than the first force is applied to unlatch the piston assembly. A biasing member of the piston assembly moves the clutch member to couple the drive and driven members when the piston assembly is in the unlatched condition. The clutch member, return spring and piston assembly are installed in a modular housing.