MUMBAI, India, July 30 -- Intellectual Property India has published a patent application (202641088572 A) filed by Renjith Thomas; St. Joseph'S College Of Engineering And Technology; Jacob Thomas; and Akhil Mathew on July 21, 2026, for Dual-Stroke, Variable-Ratio, Self-Locking Mechanical Chain Lifting System For Bidirectional Lever Actuation.
Inventors include Renjith Thomas; Jacob Thomas; and Akhil Mathew.
The application for the patent was published on July 24, 2026, under issue no. 30/2026.
Abstract: The present invention relates to a dual-stroke, variable-ratio, self-locking mechanical chain lifting system for bidirectional lever actuation, particularly adapted for manually operated lifting applications. The system comprises an operating lever operatively coupled to a dual-stroke transmission assembly including first and second drive members and corresponding one-way clutch mechanisms configured to alternately engage during upward and downward strokes of the operating lever, thereby converting both reciprocating strokes into continuous unidirectional rotary motion. The rotary output is transmitted through a mechanically actuated load-responsive variable-ratio transmission configured to automatically vary the transmission ratio in accordance with the applied load, and further through a self-locking drive mechanism configured to prevent reverse movement of the lifted load upon removal of the operating force. The output is transmitted to a drive sprocket engaging one or more lifting chains for raising and lowering a load-supporting platform. The lifting system further comprises one or more guide columns for maintaining stable vertical movement of the lifting platform and a chain tensioning mechanism for maintaining proper chain engagement during operation. By converting both upward and downward lever movements into useful lifting work while automatically adjusting the mechanical advantage according to load and preventing reverse movement of the lifted load, the invention improves lifting efficiency, reduces operator effort, enhances operational safety, minimizes wear and maintenance, and provides stable and reliable lifting performance without requiring electrical, hydraulic, or pneumatic power.
Disclaimer: Curated by HT Syndication.
