Hitachi Metals, Ltd.

Stanley Electric Co., Ltd

Kajima Corporation

Yoshikazu Maeda

Toshikazu Yamada

Naoki Tanaka

Kuniaki Sato

Hideshige Matsuo

Akio Tomita

Michio Itoh

Yoshihiro Nakamura

Isamu Yamamoto

Toshiyuki Fukumoto

Osamu Narishige

Eiji Fukuzawa

Akihiko Amana

Koji Nakano

An elasto-plastic damper to protect a building from destructive impact of seismic tremors and/or high winds. The damper is a cylindrical shaft with a constricted waist portion adapted to yield uniformly throughout its length to an external force from any direction in a plane perpendicular to the longitudinal axis of the waist portion. This elasto-plastic deformation of the damper dissipates the energy of seismic and/or wind impact throughout its range of elastic deformation. The ends of the damper are threaded to facilitate threaded fastener engagement with structural and non-structural members of building.

Elasto-plastic damper for structure

A column base structure having connected a pair of column-base metal fittings to the lower part of a column consisting of a pair of main column members disposed at predetermined intervals and connecting members disposed in such a manner as to integrally connect the main column members; the column base metal fittings being fixedly fitted to a concrete foundation via anchor bolts and nuts; characterized in that a horizontal member having a predetermined cross-sectional area is integrally and fixedly fitted between the main column members in the vicinity of the column base metal fitting.

Column base structure

Lens for a lamp

Growing community of inventors

Tokyo, Japan

Yoshikazu Maeda