Location History:
- Shizuoka, JP (1990 - 1997)
- Iwata-gun, JP (1998)
Company Filing History:
3 out of 13 
2 out of 34 Years Active: 1990-1998
Title: Masahiro Yamada: Innovator in Ball Joint and Rod-End Bearing Technology
Introduction
Masahiro Yamada is a notable inventor based in Shizuoka, Japan, recognized for his contributions to mechanical engineering. He holds five patents, showcasing his innovative spirit and technical expertise in the field.
Latest Patents
Yamada's latest patents include a ball joint and a rod-end bearing device. The ball joint features a bearing seat crimped within a housing, allowing a ball head of a ball stud to slide smoothly. The design incorporates a cylindrical crimpable portion that is inserted through the housing, secured by two stopper portions. One stopper is formed by crimping the cylindrical portion against the housing, while a dust cover is positioned between the ball stud and the other stopper. The design also utilizes ultrasonic vibration to enlarge the stopper portion outward. The inner side face of the crimpable portion inclines outward at an angle ranging from 3 to 20 degrees, enhancing its functionality.
The rod-end bearing device includes a ball seat crimped within an inner chamber of a housing, allowing the ball head of a ball stud to slide in the ball seat. The insertion hole for the ball stud flares outward, and a thick pressed portion contacts the housing around the ball seat. An indented portion around the pressed portion receives an annular raised portion of a dust cover, ensuring effective sealing. This innovative design transmits forces from the ball stud to the housing, maintaining the integrity of the dust cover.
Career Highlights
Throughout his career, Yamada has worked with prominent companies such as Ishikawa Tekko Co., Ltd. and Somic Ishikawa Co., Ltd. His experience in these organizations has contributed significantly to his development as an inventor.
Collaborations
Yamada has collaborated with notable coworkers, including Keiichiro Suzuki and Takao Fukukawa. Their combined expertise has likely fostered a creative environment that encourages innovation.
Conclusion
Masahiro Yamada's contributions to the fields of ball joint and rod-end bearing technology highlight his innovative capabilities and dedication to engineering excellence. His patents reflect a commitment to advancing mechanical design and functionality.