Company Filing History:
2 out of 1,813 
2 out of 13 Years Active: 2007
Title: Keinosuke Ichikawa: Innovator in Hydraulic Control Technologies
Introduction
Keinosuke Ichikawa is a notable inventor based in Nagano-ken, Japan. He has made significant contributions to the field of hydraulic control devices, holding a total of 2 patents. His innovative designs have enhanced the functionality and efficiency of hydraulic systems in various applications.
Latest Patents
Ichikawa's latest patents include a hydraulic control device and an industrial vehicle equipped with this technology. The hydraulic control device features a main spool located in a bypass line that connects a pump line to a return line. This main spool adjusts the opening degree of the bypass line based on the pressure in a spring chamber and a pilot chamber. Additionally, a pilot switching valve regulates the flow rate of hydraulic oil, allowing for improved control over the hydraulic actuator's load pressure. This design expands the range of hydraulic oil flow, ensuring optimal performance.
Another significant patent is the parking brake device for vehicles. This hydraulic parking brake can switch between braking and non-braking states. The braking force is designed to decrease as the pressure in the control oil chamber increases, and vice versa. The device includes a discharged oil restrictor and an accumulator that releases hydraulic oil to the control oil chamber, enabling a gradual braking process from a running state.
Career Highlights
Throughout his career, Ichikawa has worked with prominent companies such as Toyota Jidoshokki and Nishina Industrial Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to the development of advanced hydraulic technologies.
Collaborations
Ichikawa has collaborated with talented individuals in the industry, including Tetsuya Goto and Yasuhiro Maeda. These partnerships have fostered innovation and the exchange of ideas, further enhancing the impact of his work.
Conclusion
Keinosuke Ichikawa's contributions to hydraulic control technologies demonstrate his expertise and commitment to innovation. His patents reflect a deep understanding of hydraulic systems and their applications, making him a valuable figure in the field.