Haneda Humepipe Co., Ltd.

Toshinari Kato

Takashi Fujii

Nakamaro Hyodo

Tetsushi Sakane

Hironori Namioka

The present invention is provided with a key hole insertion fitted to a manhole cover, a manhole cover locking apparatus equipped with the key hole insertion, a manhole cover locking system, a method for unlocking the manhole cover, and a control system for opening and a closing manhole cover, which is designed to prevent an external access to the key hole of the manhole cover, thus attaining a sound and severe locking management. The electrical locking assembly can be added to conventional manhole covers in a simple way. The structure of the invention is characterized in a key hole insertion A inserted in a key hole of the inner manhole cover or the key hole of the manhole cover enough to engage pins with engaging openings of the cap holding member secured to the key hole or the key hole This allows the key hole insertion A to be locked to the key hole or the key hole It is also characterized in that the control chip mounted in the inserting portion after receiving the unlock signal sent from external R/W terminal transmits a control signal to pull the pins inward enough to be released from the engaging opening and thus the access to the key hole or is available.

KEY HOLE INSERTION FOR MANHOLE AND MANHOLE COVER LOCKING APPARATUS EQUIPPED WITH THE KEY HOLE INSERTION AND MANHOLE COVER LOCKING SYSTEM AND UNLOCKING METHOD AND MANHOLE COVER OPENING AND CLOSING CONTROL SYSTEM

Growing community of inventors

Choshi, Japan

Toshinari Kato