Location History:
- Chiba, JP (1990)
- Kashiwa, JP (1991 - 1995)
- Tokyo, JP (1987 - 1996)
- Ibaraki, JP (1997)
Company Filing History:
Years Active: 1987-1997
Title: Akira Tatsumi: Innovator in Hydraulic Control Systems
Introduction
Akira Tatsumi is a prominent inventor based in Kashiwa, Japan, known for his significant contributions to hydraulic control systems in construction machinery. With a total of 11 patents to his name, Tatsumi has made remarkable advancements in the efficiency and functionality of hydraulic systems.
Latest Patents
One of his latest patents is a control device for hydraulically propelled work vehicles. This invention discriminates between the vehicle propulsion condition and the performing work condition. When the vehicle is in propulsion mode, the maximum engine revolution speed is limited to a first revolution speed, and the maximum displacement is restricted to a first displacement value. Conversely, in the performing work condition, the maximum engine revolution speed is limited to a second revolution speed, which is equal to or lower than the first, while the maximum displacement is increased to a second value. This innovative approach ensures that the pump output flow during vehicle propulsion on level ground is lower than during work performance, thereby reducing pressure loss and enhancing output torque.
Another significant patent by Tatsumi is a hydraulic control system for construction machines. This system features a recovery switching valve that ceases the recovery function when the pump pressure exceeds a predetermined threshold. By controlling the engine speed to increase the pump delivery rate, the system allows for small speed changes in actuators, improving working efficiency without compromising operability.
Career Highlights
Tatsumi's career is marked by his role at Hitachi Construction Machinery Co., Ltd., where he has been instrumental in developing advanced hydraulic systems. His work has not only improved the performance of construction machinery but has also contributed to the overall efficiency of hydraulic operations in various applications.
Collaborations
Throughout his career, Tatsumi has collaborated with notable colleagues, including Seiji Tamura and Mitsuo Kihara. These collaborations have fostered innovation and have led to the successful development of several patented technologies.
Conclusion
Akira Tatsumi's contributions to hydraulic control systems have significantly impacted the construction machinery industry. His innovative patents reflect a deep understanding of hydraulic mechanics and a commitment to enhancing operational efficiency. Tatsumi's work continues to inspire advancements in hydraulic technology, making him a key figure in the field.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.