ALEXANDRIA, Va., June 4 -- United States Patent no. 12,318,013, issued on June 3.
"Height adjustment mechanism for furniture" was invented by Ronald B. Johnson (Honokaa, Hawaii).
According to the abstract* released by the U.S. Patent & Trademark Office: "A height adjustment mechanism for a chair with a housing and an adjustment lever. The housing is fixed to the base of the chair and is slidably coupled to a post supporting the chair seat. The height of the seat above the base of the chair is dependent on a position of the post with respect to the housing. The adjustment lever is positioned within the housing and has two plates joined by a spring configured to bias the two plates in opposite directions. A free end of the adjustment lever ...