Abstract: A retractable dome stadium or the like utilizing a plurality of generally lune-shaped dome panels mounted for movement between an open position in which they are stacked one above the other in superimposed relationship and a closed position in which they are disposed in a generally side-by-side relationship, and a mechanism for guiding and moving said panels between said open and closed positions. A method of operation is also disclosed.

Abstract: A convertible furniture frame assembly having a stationary base assembly that supports at least one retractable supporting means. This supporting means is used to support retractable furniture components as they are raised and lowered. The invention further incorporates at least one generally horizontal self standing support means to stabilize the furniture frame assembly and at least one two-bar torsion system that aids users in raising and lowering the furniture components. The user is also aided by a self-energizing latching means that automatically latches the retractable supporting means in its lowered position. The user is further convenienced by a retaining means that prevents loose articles on the furniture components from sliding into the base assembly during retraction.

Abstract: A pre-assembled post lock assembly for loose leaf binders having separable covers which greatly simplifies mounting of the lock to the binder. A plastic sleeve press-fitted within the barrel assembly of the lock holds a spring biased ball carrier member in alignment with the barrel housing such that the locking balls are disposed for coaction with the cam surface of the barrel whether or not the lock assembly is mounted on the binder.

Abstract: Locks of hair from synthetic fibers grouped into a bundle are welded and then cut by ultrasonic waves in a two step process. The fiber bundle is placed on a platform having a pointed ridge, and a component comprising the emitter and an ultrasonic tool is moved downwardly in two stages. The emitter is deactivated during the return to its upper position.