Abstract: An all purpose roller stand is provided by the present invention including a fixing standard with a pincher area so that said fixing standard can be fixed beside a working table. Said fixing standard has an angle-fixing portion thereof. A rotator pivots on said fixing standard. Said rotator can be fixed by said angle-fixing portion. Said rotator has plughole thereof. A T shape trestle has a transversal pole with a roller portion thereof and a longitudinal pole thereof. Said trestle can be mounted on said rotator by plug said longitudinal pole into said plughole.

Abstract: A security buckle for allowing a firm grip of a displaying device by a safety strap. The security buckle is anchored into a ventilation slit, thus preventing the strap from sliding. The security buckle comprises: an elongated member, a tooth protruding from one end of the elongated member and an arm for securing the strap onto the upper surface of the elongated member. Preferably the buckle is fabricated from a nonconductive plastic material.

Abstract: An adjustable arm rest for use with a personal computer including a support bracket couplable with the forward edge of the desk. The support bracket includes a pivot pin extending upwardly therefrom. A support plate is couplable with the support bracket. An arm support is couplable with the pivot pin of the support bracket to allow the arm support to slide and pivot with respect to the support bracket and the support plate while supporting the user's arm thereon.