Abstract: A centrifuge includes an outer frame defining therein a rotor chamber, a centrifuge rotor detachably disposed in the rotor chamber, and a door slidably mounted on the frame for opening and closing the rotor chamber. The door projects outwardly from the frame when it is disposed in an open position. Since the door is received within the frame when it is fully closed, it does not enlarge the necessary space for installation of the centrifuge.

Abstract: A vibroisolating handle joint structure for a power tool such as a disc grinder has a vibratable power tool unit, a tubular handle holder fastened to the power tool unit and having first axial surfaces, a grip handle having on one end thereof a larger-diameter cup disposed radially around the handle holder and having second axial surfaces extending in substantially axially confronting relation to the first axial surfaces, and elastic members disposed between and joined to the first and second axial surfaces. The power tool unit and the handle are thus interconnected by the elastic members in a vibroisolating manner without using metallic plates. Even when some of the elastic members are torn apart, the power tool unit and the handle are prevented from being separated from each other by the first and second axial surfaces which are engageable with each other.