US Patent Issued to Caterpillar on March 3 for "Hydraulic control system in excavator type construction machine" (Japanese Inventors)

ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,754, issued on March 3, was assigned to Caterpillar SARL (Geneva).

"Hydraulic control system in excavator type construction machine" was invented by Hideki Nakajima (Akashi, Japan) and Koichi Kiyasu (Akashi, Japan).

According to the abstract* released by the U.S. Patent & Trademark Office: "Problem to Be Solved: To investigate an opening area control of a flow control valve disposed on upstream side of the stick's direction change-over valve when using the flow control valve as a valve for restricting the supply flow rate to stick cylinder during interlocking operation of the swiveling motor and stick cylinder. Solution: A configuration is provided to control the opening area of ...