The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 20, 2002
Filed:
Mar. 29, 2000
Tetsushi Sakane, Tokyo, JP;
Nakamaro Hyodo, Higashikurume, JP;
Takashi Fujii, Katano, JP;
Hironori Namioka, Osaka, JP;
Toshinari Kato, Choshi, JP;
Haneda Humepipe Co., Ltd., Tokyo, JP;
Abstract
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.