JPH0517053Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention can be used, for example, in an oral hygiene device that suctions liquid, applies pulsation force, and discharges the liquid from a nozzle to clean the oral cavity or massage the gums. applicable. More specifically, the present invention relates to a liquid energizing device that pulsates and energizes liquid in such oral hygiene devices.

BACKGROUND ART Conventionally, in this type of liquid urging device, for example, as shown in FIG. It was in contact with the inner surface of cylinder 2.

Then, a crank 4 is connected to the base end via a pin 3.
The crank 4 converts the rotational motion into a linear reciprocating motion and transmits it to the piston 1, and the piston 1 reciprocates within the cylinder 2.

Problems to be Solved by the Invention However, in such a conventional structure, the shape of the thin wall portion 1a changes over time, creating a gap between the thin wall portion 1a and the inner surface of the cylinder 2, resulting in liquid leakage. .

Therefore, the purpose of this invention is to solve such conventional problems in the liquid urging device and to eliminate the possibility of liquid leakage occurring over time.

Means for Solving the Problems Therefore, the liquid biasing device according to the present invention has a motor 2 as shown in the illustrated embodiment below.
2 to operate the pump 26, and the pump 2
In the liquid urging device for pulsating the sucked liquid by reciprocating the piston 30 in the cylinder 32 of No. 6, the piston 30 is made of resin and has a thin wall portion 30b formed on the outer periphery of its tip. A gasket 31 is disposed on the inner periphery of the cylinder 32 so that its thin wall portion 30b is pressed against the inner surface of the cylinder 32.

Function: Even if the shape of the thin portion 30b changes over time, the gasket 31 presses the thin portion 30b against the inner surface of the cylinder 32 to bring it into close contact.

Embodiments Hereinafter, embodiments of this invention will be described in detail with reference to the drawings.

FIG. 2 shows the overall appearance of an oral hygiene device equipped with a liquid urging device according to this invention. In the figure, reference numeral 10 is the main body of the device, which is assembled onto a base 11. The base 11 has a power knob 12 and a pressure adjustment knob 1 on the front side (the front side in the figure).
Prepare 3 and 3 side by side. On the other hand, a coiled discharge tube 14 is placed on the base 11, and a handle attached to the tip of the discharge tube 14 is erected (see FIG. 3). Then, the base end of the discharge tube 14 is connected to the adjacent device main body 10. Further, a nozzle 15 is attached to the tip of the handle so as to be replaceable, and a cap 16 is covered. On the other hand, a tank 17 is placed on the device main body 10. The tank 17 has a top opening covered with a lid 18.

Now, FIG. 3 shows a schematic structure of the internal mechanism of the oral hygiene device shown in FIG. 2. Reference numeral 20 in the figure is a main body cover of the device main body 10, which together with the base cover 19 of the base 11 constitutes an exterior case of the oral hygiene device. Inside the main body cover 20 is a mounting base 21.
to store. A motor 22 is mounted on the mounting base 21. A motor gear 23 is attached to the rotating shaft of the motor 22, and meshes with a crank gear 24 supported by the mounting base 21. A crank 25 is attached to the crank gear 24, and a piston is connected to the tip of the crank 25, which will be described in detail later. The piston reciprocates within the cylinder. The cylinder is a pump 2 supported by a mounting base 21.
Form within 6. One end of a suction side tube 27 is attached to the suction port of the pump 26. The other end of the suction side tube 27 is attached to a connecting portion 28 between the device main body 10 and the tank 17.

Therefore, when the power knob 12 is turned on, the motor 22 is driven and its rotation is transmitted to the crank gear 24 via the motor gear 23. The rotation of the crank gear 24 rotates the base end of a crank 25 eccentrically attached thereto, causing a piston connected to the tip to reciprocate. As a result, the liquid in the tank 17 is sucked into the pump 26 from the connection part 28 through the suction side tube 27, and the sucked liquid is energized by the pump 26 and sent out to the outside of the apparatus main body 10. Then, the liquid is discharged in a pulsating manner from the nozzle 15 attached to the handle 29 through the discharge tube 14. Therefore, remove the cap 16, insert the tip of the nozzle 15 into the oral cavity, and turn the pressure adjustment knob 1.
3 while adjusting it appropriately, the pulsating flow discharged from the nozzle 15 can clean the inside of the oral cavity and perform gingival massage.

By the way, in this invention, the piston that reciprocates within the cylinder of the pump 26 is configured as shown in FIG. 1, for example. That is, as shown in the figure, the piston 30 is made of resin and has, for example, a cylindrical shape having a tip top portion 30a, and a thin wall portion 30b is provided on the outer periphery of the tip. The thin part 30b is the groove part 3
It is formed by extending the circumference of the main body 30d with 0c in between toward the tip into a cylindrical shape. Then, the thin portion 30b
An O-ring-shaped packing 31 is arranged on the inner periphery of the tip. The gasket 3 is located at the entrance of the groove 30c.
Provide a shape that can hold 1. Thus, the elasticity of the packing 31 keeps the thin portion 30b pressed against the inner surface of the cylinder 32 at all times.

The tip of the above-mentioned crank 25 is inserted into the base end of such a piston 30. Then, the pin 33 is press-fitted into the through hole 30e of the piston 30 so that the pin 33 passes through the tip hole of the crank 25, and the piston 30 is attached to the tip of the crank 25. Thus, the crank 25 converts the rotational motion of the crank gear 24 described above into linear reciprocating motion and transmits it to the piston 30, which causes the piston 30 to reciprocate within the cylinder 32. As a result, the pump 26 sucks the liquid and pulsates the liquid.

Therefore, the thin wall portion 30b of the piston 30 can be expanded and contracted in accordance with the inner surface shape of the cylinder 32, and can be kept in close contact with the inner surface of the cylinder 32 at all times. Due to its elasticity, it can be pressed against the inner surface of the cylinder 32 and brought into close contact with it.

Effects of the invention Therefore, according to this invention, for example, deformation over time of the thin walled portion of the piston is corrected by the packing,
Liquid leakage can be prevented.

[Brief explanation of the drawing]

1 to 3 show an oral hygiene device equipped with a liquid energizing device, which is an embodiment of the invention, in which FIG. 1 is a sectional view of the piston portion thereof, FIG. The figure is an overall schematic configuration diagram of the internal mechanism. FIG. 4 is a sectional view of a piston portion of a conventional liquid biasing device. 22... Motor, 26... Pump, 30... Piston, 30b... Thin wall part, 31... Packing,
32...Cylinder.

Claims (1)

[Scope of utility model registration request] In a liquid urging device that drives a motor to operate a pump and reciprocates a piston within a cylinder of the pump to pulsate the sucked liquid, the piston is made of resin and a thin wall portion is formed on the outer periphery of its tip. The liquid urging device further comprises a gasket disposed on the inner periphery of the thin-walled portion for pressing the thin-walled portion against the inner surface of the cylinder.