Sadao Douchi

Title: The Innovations of Sadao Douchi in Steel Pipe Connections

Introduction

Sadao Douchi, an accomplished inventor based in Tokyo, Japan, is noted for his significant contributions to the field of steel pipe connections. With a total of six patents to his name, Douchi's work reflects a deep understanding of mechanical engineering and materials science.

Latest Patents

Douchi's latest inventions focus on innovative threaded connections for steel pipes. His first patent describes a threaded connection designed for large diameter steel pipes, which features high torque resistance and excellent sealability. This invention incorporates a tubular pin with a taper thread male threadform, supported by a tubular box with a matching female threadform, also made with a taper thread. The design includes wedge threads and a dovetail-shaped cross-section, ensuring high shear resistance and durability.

In another notable patent, Douchi improved thread designs for steel pipe connections, optimizing for high torque performance, high tension performance, and superior sealability. This threaded connection also employs a pin seal positioned between the pin shoulder and the male thread while ensuring that the pin shoulder is properly spaced from the box shoulder during connection.

Career Highlights

Douchi has worked with prominent companies in the engineering sector, including Nippon Steel Corporation and Vallourec Oil and Gas France. His leadership and innovative spirit in these organizations led to pioneering advancements in threaded connection designs that are crucial for many industrial applications.

Collaborations

Throughout his career, Douchi has collaborated with talented engineers and inventors, most notably Masaaki Sugino and Yousuke Oku. These partnerships have facilitated the exchange of innovative ideas, further enriching Douchi's contributions to the field.

Conclusion

Sadao Douchi's work exemplifies innovation in the design and manufacturing of steel pipe connections. His inventions play a crucial role in enhancing the reliability and efficiency of pipe systems in various industries. With a firm foundation built on his patents and collaborations, Douchi continues to inspire future innovations in mechanical engineering and industrial design.