ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,666, issued on Feb. 25, was assigned to ASSA ABLOY AMERICAS RESIDENTIAL INC. (New Haven, Conn.).
"Door handle adapter for sprung hub" was invented by James Lin (Laguna Niguel, Calif.), Eric Xin (Xaimen, China) and Doo Fai Yip (Rowland Heights, Calif.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An adapter for either a handle set or a lever set door lever is equipped with a pair of springs to provide a pre-load on the spindle. The pre-load prevents sagging of the lever due to the large mass of the lever. A sleeve in the adapter is formed out of a compressible material that accepts the spindle in a press-fit configuration. This allows for greater ma...