US Patent 10391516 Applicator with rotary cam piston mechanism

An applied liquid applicator for discharging applied liquid by turning of an operating portion provided to a barrel main body achieves improved filling efficiency of the applied liquid stored in the barrel main body with respect to an inside capacity of the barrel main body. The applied liquid is fed to the applicator portion through the first valve and the applied liquid feed path by turning the operating portion and sliding the piston in the front-back direction by use of the cam mechanism portion.