US Patent 7448311 Displacement difference-absorbing mechanism for cylinder apparatus

A coupler is provided inside an engaging hole of a piston yoke, which is connected to pistons. A slider is installed on an upper portion of the coupler through a coupler-insertion hole. An engaging member, provided at a lower portion of the coupler, is inserted into the engaging hole so as to be displaceable by a slight amount in the widthwise direction of a cylinder tube. The coupler is inserted into the coupler-insertion hole of the slider, so that the coupler-insertion hole is slidable with respect to curved surface sections of the coupler.