US Patent 10301797 Counterweight supporting structure for construction machine

To improve the precision of position of a fastener hole and a seating face for mounting a counterweight, a counterweight supporting member is comprised of a support plate erected and fixed at the rear end of a revolving frame and a supporting member attached to the support plate. The supporting member is comprised of a base member that is locked and secured to a through hole opened on the support plate in a back and forth adjustable manner and has a counterweight fixing surface and a bolt fastening member in which a fastener hole for receiving a fastener bolt is formed.