JPH01244711A - Electrically-driven toothbrush - Google Patents

Abstract

PURPOSE:To contrive easy a usability and portability, and simultaneously, reduce driving loss by matching the centers of a case in a cylinder shape, a motor and a driving shaft and linking an eccentric shaft and a vibrating lever fitted to the driving shaft through a collar. CONSTITUTION:An electrically-driven toothbrush 9 is assembled by inserting a driving block 2 with a diameter smaller than the inner diameter of a case 1 in a cylinder shape from a bottom surface opening of the case 1 in the cylinder shape. In the on-condition of a switch 3, a motor 13 and a pinion 14 fixed to a motor shaft are rotated, a gear 15 engaged with the pinion 14 is rotated, and a vibrating lever 17 is reciprocate-rotated through a collar 5 by the drive of an eccentric shaft 16 provided to the gear 15. Thus, a driving shaft 10 is reciprocately-rotated, and a brush body fitted to the driving shaft 10 is reciprocately-rotated. Since the centers of the case in the cylinder shape, motor and driving shaft are matched, the case can be made into a small diameter, it can be made easy to grip, and the toothbrush with a good operability and an excellent portability can be obtained.

Description

[Detailed description of the invention] [Industrial application field 1 The present invention relates to an electric toothbrush.

[Prior Art] A conventional electric toothbrush 9 is as shown in FIG. 6, and as is clear from FIG. 6, the axis of the motor 13 and the drive shaft 10 are not aligned.

[Problems to be Solved by the Invention] However, in the conventional example shown in Figure @6, the axis of the motor 13 and the drive phase 10 do not match, and the grip part Case 1 was so thick that it was difficult to use and difficult to carry. There are various reasons why the case 1 becomes thicker in the conventional electric tooth pusher 9, including the relationship between the diameter of the motor 13 and its power, the size of the battery, the strength of the mechanism, loss, and the size of the waterproof boot 32. There is. For example, in the case shown in FIG. 6, when trying to reduce the diameter of the case 1, the drive shaft 10 is eccentric from the center of the cylindrical case 1, so the waterproof boot 3
2 has to be made smaller, so waterproof boots 32
There is a problem in that the viscous resistance of the waterproof boots 32 is large, resulting in drive loss, and if the waterproof boots 32 are removed, they will protrude from the case 1. Also, if the centers of the drive shaft 10 and the motor 13 are aligned, the diameter can be made smaller, but since the length of the lifting lever 17 cannot be made long, the eccentric shaft 16 is located near the center of swing of the swing lever 17. Therefore, there is a problem in that the resistance between the swing lever 17 and the eccentric shaft 16 increases, resulting in drive loss.

The present invention was invented in view of the above-mentioned conventional problems, and its purpose is to provide an electric toothbrush that is small in diameter, easy to use, easy to carry, and has low drive loss despite its small diameter. is to provide.

[Means for Solving the Problems 1] The electric toothbrush of the present invention has the centers of the cylindrical case 1, the motor 13, and the drive shaft 10 aligned, and the motor 1
3, the eccentric shaft 16 that is eccentrically rotated and the swing lever 17 attached to the drive shaft 10 are connected via the collar 5, and such a configuration is adopted. This achieves the above-mentioned object of the present invention.

[Operation 1] According to the present invention, the centers of the cylindrical case 1, the motor 13, and the drive shaft 10 are aligned, so the case 1 can be made small in diameter, and the drive shaft 10
By connecting the eccentric shaft 16 and the swinging lever 17 via the collar 5, the resistance can be reduced even though the centers of the two are aligned.

[Examples] The present invention will be explained in detail below with reference to Examples. An electric toothbrush 9 is shown in FIGS. 1 and 2.゛This electric toothbrush 9
is the cylindrical case 1 from the bottom opening of the cylindrical case 1.
A drive block 2 having a diameter smaller than the inner diameter of the case 1 is inserted and assembled as shown in FIG.
(not shown) can be detachably attached.

The electric toothbrush 9 is powered by a dry cell battery 11 that is inserted into the case 1 from the bottom opening of the case 1, and then closed with a bottom cap 12.
is attached to the bottom opening of case 1.

The drive block 2 has a motor 13, a pinion 14 fixed to the motor shaft, and a gear 1 on a base 19, which has a bearing holder 19a and a separate motor mounting base 19b.
5. It is constructed by incorporating an eccentric shaft 16, a swing lever 17, a drive shaft 10, a switch 3, etc. To assemble the drive block 2, fix the bearing 28 to the bearing holder 19a, attach the motor 13 to the motor mount 19b, press fit the pin 27 into the bearing holder 19a, insert the gear 15 into the pin 27, After inserting the swing lever 17, the bearing holder 19a and the motor mounting base 19b are connected by screws 29. Here, the screws 29 also serve to attach switch fittings 25 and 26, which will be described later, to the base body 19. The swing lever 17 attached to the lower part of the drive shaft 10 has a U-shaped cross section as shown in FIG. 4, and has a long hole 30 bored in its upper bottom. On the other hand, a collar 5 is attached to an eccentric shaft 16 protruding from the upper surface of the gear 15. Also, eccentric shaft 1
6 has a hole 31 bored therein as shown in FIG. 3, and the long hole 30 and hole 31 are inserted into the bottle 27. The eccentric shaft 3 is fitted through the collar 5 into a recess 17a of a swing lever 17 having a U-shaped cross section. A waterproof boot 32 with reduced torque loss is placed in the upper opening of the cylindrical case 1 so as to coincide with the center of the cylindrical case 1. It is placed at the center of the cylindrical case 1. In this way, by aligning the centers of the cylindrical case 1, the motor 13, and the drive shaft 10, the length of the swing lever 17 can be shortened. The switch 3 is composed of a switch lever 20 and switch fittings 25 and 26.

The switch lever 20 has a pair of bearings facing each other on the outer surface of the base 19 and is mounted between the parts 21 so as to be movable, and the pair of bearings are arranged in two rows of click grooves 22 or 22 provided on the opposing inner surfaces of the part 21. A click protrusion 24 of the switch lever 20 enters one of the click grooves 23, and by rotating the switch lever 20, the click protrusion 24 enters the other click groove 23 or the click groove 22. Further, switch metal fittings 25 and 26 are attached to the base body 19, and when the click protrusion 24 of the switch lever 20 enters the click groove 22, the switch metal fitting 25 is pushed by the switch lever 20 and comes into contact with the switch metal fitting 26. The switch lever 20 is set to be electrically conductive and turn on, and when the switch lever 20 is rotated and the click protrusion 24 enters the click groove 23, the switch lever 20 separates from the switch fitting 25, so that the switch is turned on. The setting is such that the metal fitting 25 is separated from the switch metal fitting 26 due to its own spring force and is turned off. When the switch 3 is on, the motor 13 and the pinion 1 fixed to the motor pongee
4 rotates, the gear 15 meshing with the collar 5 rotates, and the eccentric shaft 16 provided on the gear 15 is driven to rotate the collar 5.
The swing lever 17 reciprocates through the swing lever 17, and the drive shaft 18 reciprocates due to the reciprocation 17 of the swing lever 17, so that the brush body attached to the drive shaft 18 reciprocates.

An opening 4 is formed on the side surface of the cylindrical case 1 at a location corresponding to the switch 3. After the drive block is assembled inside the case 1, a rubber operator 7 is placed in the opening 4 from the outside of the case 1, and the operator 7 is held between the case 1 and the switch panel 8, and the switch panel 8 is fixed to case 1 by ultrasonic welding or the like. A protrusion 6 is provided on the back surface of the operator 7 for pushing and operating the switch 3 facing the opening 4 on the side surface of the case 1. Here, the projections 6 provided on the operator 7 include a projection 6a facing one end of the switch lever 20 and a projection 6b facing the other end of the switch lever 20. The surface of the operator 7 has protrusions 6a, 6.
Accordingly, operating sections 7a and 7b are provided, respectively, and the operating sections 7a and 7b have different shapes, so that the on side and the off side can be distinguished.

When one operating part 7a of the operator 7 is pressed, one end of the switch lever 20 is pushed by the protrusion 6a, the click protrusion 24 of the switch lever 20 enters the click groove 22 and is turned on, and conversely, the other operating part When 7b is pressed, the switch lever 20 is rotated by the protrusion 6b, and the click protrusion 24 enters the click groove 23, turning it off.

[Effects of the Invention] As described above, in the present invention, the centers of the cylindrical case, the motor, and the drive shaft are aligned, so the case can be made with a small diameter, making it easy to grip and operate. It is highly portable and has excellent portability, and since the eccentric shaft driven by a motor and the swinging lever attached to the drive shaft are connected via a collar, the center of the shaft can be aligned with the drive shaft. However, by connecting the eccentric shaft and the swinging lever via a collar, it is possible to reduce resistance and drive loss, and by aligning the drive shaft with the center of the cylindrical case. The waterproof boots can be installed in a well-balanced manner to ensure waterproofness without compromising reliability.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway front view of the present invention, Fig. 2 is a sectional view taken along A-A#i in Fig. 1, Fig. 3 is an exploded perspective view showing the eccentric shaft and collar of the same as above, Fig. 4 is a perspective view of the swing lever, the fifth
The figure is a perspective view of a drive block, and FIG. 6 is a sectional view of a conventional example, in which 1 is a case, 5 is a collar, 10 is a drive shaft, and 13 is a sectional view of a conventional example.
is a motor, 16 is an eccentric shaft, and 17 is a swing lever. Agent Patent Attorney Ishi 1) Ai 7 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] (1) The centers of a cylindrical case, motor, and drive shaft are aligned, and the eccentric shaft driven by the motor for eccentric rotation is connected via a collar to a swinging lever attached to the drive wheel. An electric toothbrush characterized by: