Abstract: A flapper valve for a toilet tank has an annular flange, a cone and an airflow controlling member. The cone is hollow and protrudes from the bottom of the annular flange. The cone has chamber and a vent defined in the outer periphery of the cone and communicating with the chamber. The airflow controlling member is attached to the cone and corresponds to the vent to make air in the chamber being discharged through the airflow controlling chamber. Accordingly, the discharging rate of the air from the chamber in the cone is adjustable, and the volume of flushing water of the toilet is also adjustable.

Abstract: A writing utensil structure includes a body having an upper end portion and a lower end portion defining a first sound emitting nozzle. A spacer is mounted in an inner wall of a mediate portion of the body for closing it, thereby defining an upper chamber and a lower chamber communicating with the first sound emitting nozzle. A first sound diffusing nozzle is defined through an outer wall of the lower end portion of the body and communicates between the lower chamber and the first sound emitting nozzle. A first sound guiding wedge is mounted in an inner wall of the lower end portion of the body and is located diametrically opposite to the first sound diffusing nozzle. By such an arrangement, the writing utensil structure can function as a whistle.

Abstract: A writing utensil structure includes a housing having an upper end portion with a neck extending upwardly and two diametrically opposite lugs each protruding from the neck. A passage is defined in the upper end portion of the housing and extends through the neck. A cap is mounted on the upper end portion of the housing and includes an inner wall having a first recess defined in a lower portion thereof for receiving the neck, a second recess defined in an intermediate portion thereof for receiving each of the two lugs, and a third recess defined in an upper portion thereof and aligning with the passage. A writing utensil is received in the passage and has an upper end with a tip extending upwardly and received in the third recess.

Abstract: A writing utensil structure includes an upper body having an upper end portion with a first neck having two first lugs, and a lower end portion with a second neck having two second lugs. A cap has an inner wall defining a first recess for receiving the first neck, and a second recess for receiving the two first lugs. An intermediate body includes an upper end portion having an inner wall defining a first socket for receiving the second neck, and a second socket for receiving the two second lugs, and includes a lower end portion having an inner wall with a first space defined in a lower portion thereof, and a second space defined in a mediate portion thereof. A lower body includes an upper end portion having a third neck received in the first space. Two third lugs each protrude from the third neck and are each received in the second space. A first writing utensil is received in a first passage defined in the upper body, and a second writing utensil is received in a second passage defined in the lower body.