Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Mitsubishi Electric Home Appliance Co., Ltd.

Koei Matsukawa

Katsunori Sato

Eiji Ando

Yoshikatsu Hayashi

Hiroyuki Nakagawa

Toshihisa Imai

Atsushi Mitsui

In an elevator apparatus, a main rope suspending a car and a balance weight is looped around a traction sheave and a driven sheave of a traction machine. A driving-side speed detecting portion for detecting rotational speed of the traction sheave and a driven-side speed detecting portion for detecting rotational speed of the driven sheave are electrically connected to an operation control device. The operation control device includes a determination portion determining presence or absence of an abnormality in an elevator by calculating speed difference between rotational speeds of the traction sheave and comparing the speed difference to a fixed reference value, set in advance, and a control portion for controlling the operation of the elevator based on information from the determination portion.

Elevator apparatus with sheave rotational speed difference determination for detecting an abnormality

A porous-plastic bearing comprises a porous-plastic sliding bearing member which is formed by gathering a cluster of plastic particles each having a volume in the range of from about 0.004 mm.sup.3 to about 4 mm.sup.3 and sintering the cluster of plastic particles while setting its porosity at a selected value in the range of from about 10% to about 30%. Furthermore, the sliding bearing member comprises a plurality of plastic particles in any longitudinal or cross section. Pores formed within the sliding bearing member are impregnated with or filled with a lubricating agent.

Porous-plastic bearing and method of manufacturing porous-plastic bearing

Growing community of inventors

Tokyo, Japan

Koei Matsukawa