I invented the "double crescent mother-child double anti-theft lock"

**Biography of a Chinese Inventor and Mechanical Engineer** A male Han Chinese, born on July 12, 1956, is a dedicated member of the Communist Party of China. He hails from Nangong City, Hebei Province. In May 1973, he began his career in Nanyang, Henan Province, working at the No. 5143 Factory First Research Institute of the State-owned (Henan State-owned Xiangdong Machinery Factory). Over the past 27 years, he has focused on the production of military equipment and vehicle axles. His creativity and determination led to numerous innovative proposals and technological advancements that significantly contributed to both military and civilian product manufacturing at Xiangdong Machinery Factory. In his spare time, he never stopped learning, actively researching and improving his professional skills. Over the years, he has traveled to more than 20 cities across China, including major industrial hubs like Wenzhou, Shanghai, and Guangdong. He has published over 100 papers in various mechanical and technical journals such as "Electromechanical Daily Newspaper," "Mechanical Workers," and "Machine Manufacturing." His work has earned him recognition and awards from both domestic and international institutions. He has also been honored by CCTV-10's "I Love to Invent" program, where he showcased his innovations in lock technology. He holds seven national patents, including the "Automatic Iron Unloading Device," "Mother-and-Child Double Lock," and "Column Automatic Lock." His inventions have been featured in prestigious publications like "China Contemporary Science and Technology Experts" and "Contemporary Chinese Inventions." After 2000, due to factory inefficiencies, he participated in the "buy-out service" and "self-destruction" initiatives. He then moved to Guangdong, Shanghai, and Wenzhou, working in locksmith businesses such as Leian, Baomin, Yuexin, and Spring City. Through hard work and innovation, he established a new precedent for the development and design of hardware locks in China, filling an international gap and making significant contributions to the industry. --- **The Birth Background of the Mother-in-Law Double Anti-Theft Lock** Locks have a long history in China, with records dating back over 5,000 years. From padlocks and drawer locks in the 1950s, to anti-theft locks in the 1960s, ball locks in the 1970s, and electronic locks in the 1990s, the evolution of locks has been remarkable. Today, smart locks, fingerprint locks, and intercom systems represent the latest in security technology. China is now the world’s largest producer and consumer of locks, with over 1,000 companies producing more than 5 million yuan annually. Zhejiang, Guangdong, and Shandong have formed mature lock manufacturing clusters, with Wenzhou known as the "China Lock Capital." With the rise of residential, automotive, and high-end office construction, the demand for high-precision locks in defense, public security, and finance has increased. High-end locks, such as IC card locks, encrypted magnetic card locks, and fingerprint locks, are becoming mainstream due to their advanced features and high profit margins. As the market grows rapidly, China’s lock industry is moving toward internationalization and branding. Locks play a vital role in home safety. People not only seek strong anti-theft performance but also aesthetic designs. To meet these needs, I invented the "Mother-in-Law Double Anti-Theft Lock." With extensive experience in mechanical engineering and lock development, I aimed to create a more secure locking system. After analyzing real-life theft scenarios, I identified key weaknesses in traditional locks: simple structures, limited key codes, and slow technological updates. Inspired by the spring knife mechanism, I spent over two years designing and testing a new lock system. The result was the "Mother-in-Law Double Anti-Theft Lock" (Patent No. ZL02215284.9), which offers an unprecedented level of security. --- **Structural Principle and Features of the Mother-in-Law Double Anti-Theft Lock** This lock combines two locks and a single core into one unit, with keys designed as mother and child keys. Its theoretical key code exceeds 762.5 billion, far surpassing conventional locks. This complexity makes it extremely difficult for thieves to open using technical methods. The design also prevents simultaneous rotation, increasing security. --- **Usage of the Mother-in-Law Double Anti-Theft Lock** The operation is similar to traditional locks: 1. **Unlocking**: Insert the red key upward, rotate 180 degrees to make the blue point up, press the handle to push out the subkey, then turn counterclockwise to unlock. 2. **Removing the Key**: Rotate the key to lift the blue point, pull out the subkey, then rotate 180 degrees to remove the mother key. 3. **Opening the Door**: Turn the knob clockwise and pull the door open. 4. **Locking the Door**: Simply close the door; it locks automatically, eliminating the need for keys and reducing the risk of forgetting to lock. --- **Key Features of the Mother-in-Law Double Anti-Theft Lock** 1. **Double-Spring Design**: Combines front and rear springs with a step-by-step insertion system, making technical opening difficult. 2. **Dual-Key System**: Increases key distribution and reduces copying risks, enhancing security. 3. **Cross Four-Way Flange Design**: Prevents loosening and improves stability. 4. **Automatic Lock Mechanism**: Patent No. ZL02215280.6, offering anti-drilling, anti-mite, and simplified structure benefits. --- **Conclusion** The "Mother-in-Law Double Anti-Theft Lock" is a revolutionary invention with advanced technology, strong security, and global significance. I hope this lock can be widely used in homes, banks, safes, and warehouses worldwide. It will enhance societal safety, reduce crime, and bring immense social and economic benefits. Together, we can build a safer, more harmonious, and technologically advanced society.

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