Abstract: A mouthpiece having a vestibular shield overlapping a user's teeth and gums, a gases passageway extending through the vestibular shield allowing for the passage of the gases through the mouthpiece and an extra oral sealing member is associated with the gases passageway. The passageway in use causes gases to be diffused when exiting from the gases passageway. The mouthpiece may have a noseflap to seal the user's nose or provide a passageway for the user's nasal passages. The mouthpiece may have an adjustment arrangement to alter a distance between the vestibular shield and the extra-oral sealing member.

Abstract: A spindle nut assembly includes inner and outer nuts having corresponding beveled surfaces. The inner nut is tightly threaded onto an end of a spindle and is positioned to achieve a desired endplay setting. The outer nut contacts the inner nut at an oblique angle via the beveled surfaces, which squeezes the inner nut more tightly onto the spindle while still maintaining the desired endplay setting.

Abstract: This invention provides a locking fastener in which a nut is provided with symmetrical axial slots extending inwardly from one end, a sleeve surrounds the nut and has ribs in the slots for engaging the thread of a threaded shank received in the nut, and a tubular member extends around the sleeve for pressing the sleeve into an annular groove in the nut for retaining the sleeve on the nut. The ends of a tubular member are bent inwardly adjacent the ends of the sleeve for holding the tubular member on the sleeve.