Abstract: Disclosed is a vibration damping apparatus incorporated in the crossing of diagonal members such as braces of a framed structure for damping vibration imparted by external force such as an earthquake or a strong wind. The apparatus comprises a plurality of rotatable members or discs, a resistive body disposed between the discs, and a pair or pairs of link bars causing relative rotation of the discs in response to the impartation of the external force, whereby the vibration is damped by the resistance force of the resistive body resisting to the external force.

Abstract: Disclosed is a vibration damping apparatus incorporated in the crossing of diagonal members such as braces of a framed structure for damping vibration imparted by external force such as an earthquake or a strong wind. The apparatus comprises a plurality of rotatable members or discs, a resistive body disposed between the discs, and a pair or pairs of link bars causing relative rotation of the discs in response to the impartation of the external force, whereby the vibration is damped by the resistance force of the resistive body resisting to the external force.

Abstract: A process for producing porous cast iron, wherein cast iron having flake graphite structure is subjected to heat treatment in a high temperature gas atmosphere in which the iron component of the cast iron base is not subjected to oxidation and on the other hand the flake graphite is subjected to oxidation, whereby the flake graphite disappears from the cast iron to form pores therein.

Abstract: This invention relates to self-lubricating bearings or other antifriction elements formed of a lubricant-containing polyacetal. It can be manufactured in various shapes by molding a powdery mixture of the polyacetal having a bulk factor of 2-8 with 2-12 wt % of the lubricant which is in a liquid state at a normal room temperature or at the melting point of the polyacetal by a screw type injection molding machine having controlled temperatures in the feed, compression, metering and nozzle sections of the heating cylinders.During the process, the lubricant is uniformly dispersed in said resin material as fine particles independent from each other and this accounts for the extraordinarily high retention of lubricant film which forms on the bearing surface of the molded articles in use.