MUMBAI, India, Jan. 9 -- Intellectual Property India has published a patent application (202531128242 A) filed by Indian Institute Of Technology (Indian School Of Mines), Dhanbad, Jharkhand, on Dec. 17, 2025, for 'a self-indexing mechanism for stepwise rotation of pick within pick-box assembly of mining excavators.'
Inventor(s) include Prof. L A Kumaraswamidhas; Prof. V M S R Murthy; Mr. Saurabh Raj; Mr. Aayan Rai; Mr. Akshit Bhagat; and Mr. Rupesh Kumar.
The application for the patent was published on Jan. 9, under issue no. 02/2026.
According to the abstract released by the Intellectual Property India: "A self-indexing mechanism for stepwise rotation of pick within pick-box assembly of mining excavators. The present invention relates to a purely mechanical and self-regulating rotation system built directly into a pick (cutting bits) (1) and pick-box (2). The pick (1) features multiple circumferential grooves (105) on its outer surface. Each groove consists of two distinct regions- a vertical path (109) followed by an inclined guiding path (110). A high- stiffness spring (205) positioned between a plate (206) and a cap (204) housed within the pick-box (2). In operation, when impact occurs, the pick moves axially inward compressing the spring (205). The stationery teeth (203) inside the pick-box (2) engage the vertical grooves, guiding the pick through a straight path. The tooth (203b) enters the locking zone, when descends further. The locking action (107) prevents the tooth (203b) to re-enter the same groove upon spring recovery, ensuring teeth (203b) to be directed toward the next adjacent groove during compression. When the external force ceases, the retraction movement forces the pick to rotate by a predetermined angular increment before returning to its original axial position."
Disclaimer: Curated by HT Syndication.
