초록 ▼

A plunger for a syringe of a liquid dispenser comprises a tapered front end section 12 having at its rear end 16 an outer diameter slightly smaller than the inner diameter of the syringe, a cylindrical drum section 14 continued to the rear end 16 of the tapered front end section 12, having a maximum

A plunger for a syringe of a liquid dispenser comprises a tapered front end section 12 having at its rear end 16 an outer diameter slightly smaller than the inner diameter of the syringe, a cylindrical drum section 14 continued to the rear end 16 of the tapered front end section 12, having a maximum outer diameter substantially the same as the inner diameter of the syringe and opening there, and a collar member 24 (30, 32) slidably formed by coupling with an outer circumferential surface in the vicinity of an opening 22 of the drum section 14 and maintaining the close contact with an inner wall surface 26 of the syringe 18, thereby inclination toward the syringe is eliminated and action within the syringe is constantly made smooth.

대표청구항 ▼

What is claimed is: 1. A plunger for a syringe of a liquid dispenser for pressurizing a liquid material contained in the syringe by compressed air to discharge the liquid from an outlet provided in the syringe, comprising:a tapered front section having a rear end, an outer diameter of the rear end b

What is claimed is: 1. A plunger for a syringe of a liquid dispenser for pressurizing a liquid material contained in the syringe by compressed air to discharge the liquid from an outlet provided in the syringe, comprising:a tapered front section having a rear end, an outer diameter of the rear end being slightly smaller than an inner diameter of the syringe;a cylindrical drum section comprising a continuation of the rear end of the tapered front section, a rear end of said cylindrical drum section having an outer diameter substantially the same as the inner diameter of the syringe, a rear end of said cylindrical drum section being open, the open end of the cylindrical drum section receiving compressed air from the syringe for pressurizing the liquid material contained in the syringe to discharge the liquid from the outlet in the syringe; anda collar member coupled with a circumferential surface of the cylindrical drum section, said collar member comprising two annular curved surface sections configured to maintain close sliding contact with different inner surface regions defined along a circumferential direction of the inner wall surface of the syringe, a first longitudinal end of the collar member being circumferentially joined to the cylindrical drum section at the open end of the cylindrical drum section.