Abstract: A transmitter of audible sound waves is disposed at one end of a communicating hole of a cast molded article such as a cylinder block, and a receiver of audible sound waves is disposed at the other end of the communicating hole. The quality of the communicating hole is determined by receiving audible sound waves from a transmitter which have passed through the communicating hole and computing and processing a frequency spectrum of the received audible sound waves based on a reference frequency spectrum.
Type:
Grant
Filed:
February 7, 2001
Date of Patent:
April 9, 2002
Assignee:
Ryoei Engineering Co., Ltd.
Inventors:
Miyuki Satou, Oscar Vanegas, Toyokazu Itou
Abstract: A transmitter of audible sound waves is disposed at one end of a communicating hole of a cast molded article such as a cylinder block, and a receiver of audible sound waves is disposed at the other end of the communicating hole. The quality of the communicating hole is determined by receiving audible sound waves from a transmitter which have passed through the communicating hole and computing and processing a frequency spectrum of the received audible sound waves based on a reference frequency spectrum.
Type:
Application
Filed:
February 7, 2001
Publication date:
November 22, 2001
Applicant:
RYOEI ENGINEERING CO., LTD.
Inventors:
Miyuki Satou, Oscar Vanegas, Toyokazu Itou
Abstract: A push-pull chain having a lock mechanism provided between inner links and outer links, which are rotatably coupled together by link pins, to thereby permit the mutual pivotal movement of both links to be restricted. The lock mechanism is provided to both links on an axial line parallel to each link pin. As a lock pin moves parallel on the axial line and it is fitted in both links, the mutual pivotal movement of the links is locked.
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