JPH0519051Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field This invention drives a motor to operate a pump via a crank mechanism, sucks liquid with the pump, and pulsates the sucked liquid.
It can be applied to an oral hygiene device that cleans the oral cavity by discharging it from a nozzle into the oral cavity, and also performs gingival surgery. Specifically, in such an oral hygiene device, the present invention relates to a crank mechanism that converts rotational motion of a motor into linear reciprocating motion and transmits the linear reciprocating motion to a pump.

Conventionally, in this type of crank mechanism, for example, as shown in FIG. engage. and,
A motor (not shown) is driven to rotate the crank gear 2, and the rotation of the crank gear 2 rotates the base end of the crank 3, and the crank 3 converts the rotational motion into linear motion, which is then connected to the tip of the crank 3. The pump was operated by reciprocating a piston 4 within a pump block 5.

Problems that the invention aims to solve However, with this type of conventional crank mechanism,
As can be seen from FIG. 4, the axial movement of the crank gear 2 and the crank 3 on the gear shaft 1 is not restricted, and their axial movement is prevented by the pump block 5, etc., which the crank 3 engages with via the piston 4. was prevented. Therefore, when the oral hygiene device is used, there is a problem in that the crank gear 2 and the crank 3 move in the axial direction and generate noise.

SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to solve the above-mentioned problems in the crank mechanism of an oral hygiene device and to prevent noise generation.

Means for Solving the Problems Therefore, the crank mechanism according to this invention has a motor 2, for example, as shown in the illustrated embodiment below.
2, the crank 25 rotates the crank gear 24 and engages with the eccentric protrusion 24a of the crank gear 24.
The crank 25 converts the rotational motion into linear motion by rotating the base end of the pump, and the piston 32 connected to the tip of the crank 25 reciprocates to operate the pump 26, which sucks the liquid. In an oral hygiene device that is energized in pulsation and discharged from a nozzle 15, a gear shaft 30 of the crank gear 24 passes through the eccentric protrusion 24a and supports the crank gear 24 slidably in the axial direction. Axis 3
0, a washer 34 that is slidably supported in the axial direction is biased by a spring, and the washer 34 moves the crank 2.
5, the crank gear 24 is compressed in the axial direction.

Function The washer 34 biased by the spring restricts the axial movement of the crank gear 24 and the crank 25 on the gear shaft 30.

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 crank mechanism 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, although not shown. The piston reciprocates within the cylinder. The cylinder is formed within a pump 26 which is supported by a mount 21. One end of a suction side tube 27 is attached to the suction port of the pump 26. Suction side tube 27
The other end is the connection part 2 between the device body 10 and the tank 17.
Attach to 8.

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.

In the illustrated embodiment, the crank mechanism that converts the rotational motion of the motor 22 into linear reciprocating motion and transmits it to the pump 26 is configured as shown in FIG. 1 in detail. Reference numeral 21a in the figure is a downward protrusion that is formed integrally with the above-mentioned mounting base 21 when it is molded, and 21b is a reinforcing protrusion that is also formed integrally with the mounting base 21 when it is molded and is provided radially around the downward protrusion 21a. be. Mounting stand 2
1, the base end of the gear shaft 30 is inserted into the downward projection 21a, and its tip is suspended from the mounting base 21. However, the gear shaft 30
The above-described crank gear 24 is rotatably and slidably mounted in the axial direction. The crank gear 24 has an eccentric protrusion 24a at an eccentric position through which the gear shaft 30 passes, and lubricating grease is interposed on the outer periphery of the eccentric protrusion 24a.
Engage the proximal end of 5. At the tip of the crank 25,
A piston 32 is connected via a pin 31. That is, the tip of the crank 25 is inserted into the base end cylindrical portion of the piston 32, and the pin 31 press-fitted into the cylindrical portion in the radial direction penetrates the tip of the crank 25 inserted into the base end cylindrical portion. The piston 32 is connected. The piston 32 is housed in the cylinder block 33 of the pump 26 described above so as to be able to reciprocate. On the other hand, a washer 34 is attached to the tip of the gear shaft 30 so as to be slidable in the axial direction. Then, a leaf spring 35 is further attached to the outside thereof, and finally a set screw 36 is attached to hold down the leaf spring 35. However, leaf spring 3
5, bias the washer 34 in the axial direction and rotate the crank 2.
5, the crank gear 24 is pressed against the downward protrusion 21a of the mounting base 21. Here, Watshiya 34
The protruding height h of the eccentric protrusion 24a formed on the crank gear 24 is made smaller than the thickness t of the base end of the crank 25 so that the crank gear 24 is pressed via the crank 25.

This prevents the axial movement of the crank gear 24 and the crank 25 on the gear shaft 30, and also rotates the base end of the crank 25 which is eccentrically attached to the crank gear 24 by driving the motor 22, The crank 25 converts rotational motion into linear motion, and the cylinder block 3
The piston 32 is reciprocated within the pump 3 to operate the pump 26.

Effects of the invention Therefore, according to this invention, the spring-biased washers restrict the axial movement of the crank gear and crank on the gear shaft, thereby eliminating the axial play in them and reducing noise generation. can be prevented. Furthermore, the washer can prevent the lubricating grease interposed between the eccentric protrusion of the crank gear and the crank from escaping, thereby improving durability.

[Brief explanation of the drawing]

Figures 1 to 3 show an oral hygiene device equipped with a crank mechanism which is an embodiment of this invention. Figure 1 is a sectional view showing the crank mechanism, Figure 2 is a perspective view of the overall appearance, and Figure 3 is an oral hygiene device equipped with a crank mechanism. FIG. 2 is an overall schematic configuration diagram of an internal mechanism. FIG. 4 is a sectional view showing a conventional crank mechanism of an oral hygiene device. 15... Nozzle, 22... Motor, 24... Crank gear, 24a... Eccentric protrusion, 25... Crank, 26... Pump, 30... Gear shaft, 32...
... Piston, 34... Watshiya.

Claims (1)

[Scope of utility model registration request] A motor rotates a crank gear, the base end of the crank engages with the eccentric protrusion of the crank gear, the crank converts rotational motion into linear motion, and the piston connected to the tip of the crank reciprocates. In an oral hygiene device in which a pump is actuated by the pump, the pump sucks liquid, pulsates it, and discharges it from a nozzle. An oral hygiene device comprising a washer which is movably supported and which is also slidably supported in the axial direction by the gear shaft, which is biased by a spring, and which presses the crank gear in the axial direction via the crank. crank mechanism.