JPS5927778Y2 - Electric toothbrush drive assembly structure - Google Patents

Description

[Detailed description of the invention] This invention relates to the internal structure of the electric tooth side, that is, the structure of the drive part, and includes various parts such as the storage battery, motor, switch mechanism, toothbrush drive shaft, and its power transmission gear. Overall, it can be assembled into a compact unit, especially when assembling,
It was devised to have two functions in one part, making it easier to assemble with fewer parts overall.

Hereinafter, one embodiment of the present invention will be described based on the drawings.
The electric gear side piece 3, which is placed against a charging stand 2 with an hourglass 1, has a main body case 4 made of synthetic resin, into which a unitized driving part A shown in FIG. 4 is inserted.

5 is a toothbrush drive shaft 6 protruding from the upper end of the main body case 4
It is an individual toothbrush that is attached to the toothbrush.

This proposal relates to the assembly structure of the drive unit A, which will be explained next.As the overall support of the unit A,
A synthetic resin support shown in 7 is used.

This support body 7 has three parts: a lower cylinder 8 whose lower surface is open, a wall portion 9 extending upward from the upper surface and having a semicircular arc cross section, and a flat wall portion 10 above the lower cylinder 8. Part 8,9
．． 10 works as follows.

That is, a storage battery 11 is inserted into the lower tube 8, and its positive terminal is connected to a motor 13 via a lead wire 12.

A small cylindrical protrusion 14 is provided on the upper side of the lower tube 8 facing the semi-circular wall portion 9.

On the other hand, a pair of fixed contacts 15 and 15' are provided vertically in parallel on the uppermost plane wall 10, and the fixed contacts 15 and 15' are provided on the uppermost plane wall 10 in parallel with each other, and 15
．． A switch mechanism S is provided by attaching a diamond-shaped short-circuiting contact piece 17 that short-circuits between 15' and 15'.

The switch mechanism is operated by a rotating lever 18 coupled to the rotating element 16 from the outside.

A motor 13 and a bracket 19 on which movable power parts are mounted are attached to the intermediate wall portion 9 having a semicircular arc cross section.

The motor 13 is flat and has a pair of mounting holes 20, 20 formed in the upper end surface of its outer case, and a driving gear 22 is fixed to a protruding motor shaft 21.

The mounting bracket 19 is made of synthetic resin, and the lower surface of a substantially circular bottom plate 23 is opened in the center so that the driving gear 22 faces, and the motor 13 is fitted into the mounting hole 20, 20 of the motor. Protrusions 24 and 24 for temporary fixing are provided, and a driven gear 26 that meshes with the driving gear 22 is pivotally supported on a support shaft 25 that is integrally provided on one side.

Further, the cylindrical case 27 extending upward from the bottom plate 23 has the toothbrush drive shaft 6 inserted therethrough and is pivotally supported by an upper metal (not shown), and a horizontal drive lever fixed to the lower end of the drive shaft 6. 29 engages with the eccentric pin 30 of the driven gear 26 through its downward engaging recess 31.

A locking protrusion 3 is provided on one side of the bracket bottom plate 23.
2. A locking hook piece 33 is integrally provided on the other side.

Therefore, when the motor 13 is temporarily fixed to the bottom plate 23 of the bracket 19 and inserted into the semi-circular wall portion 9 of the support 7 from the side as shown by the arrow in FIG. 13 are respectively inserted between the upper end wall 9' of the semicircular arc wall 9 and the upper wall 8' of the lower cylinder 8, and the motor 13 and the bottom plate 23 are respectively inserted in FIG. Approximately half of the right side of the wall portion 9 is fitted into the inner semicircular recess 34 of the wall portion 9.

At this time, one of the locking protrusions 32 of the bottom plate 23 engages with a locking hole 35 formed above the semicircular arc-shaped wall portion 9 as shown in the second figure, thereby fixing one side.

However, fixing is insufficient if only one side is used, and the fixing force is applied only to one side, causing the whole to be distorted, so the unique structure of the present invention is used here.

That is, the wide conductive plate shown in figure 36 forms part of the discharge circuit of the storage battery 11, and has a round hole 37 at the bottom and a square hooking hole 38 at the top. It is located on the opposite side of the motor 13 and the bracket bottom plate 23, and on the left side in FIG.

Then, the lower end is soldered to the negative terminal of the storage battery 11, and the round hole 37 is locked to the cylindrical projection 14 of the support lower cylinder 8, and the bracket bottom plate 23 is further connected to the upper locking hole 38'. The other locking hook piece 33 is hooked to apply a force that pulls the entire motor 13 and bracket 19 downward, thereby holding the motor 13 and the bracket 19 in place.

Finally, the tip of the conductive plate 36 is soldered to the fixed contact 15 above, completing the entire assembly.

In this manner, the conductive plate 36, which is an electric circuit component, is used as a holding member for one side of the bracket 19 and the motor 13, thereby completely fixing both components 19 and 13.

Incidentally, a lead wire 3 is connected from the lower fixed contact 15'.
9 is arranged and connected to the negative terminal of the motor 13.

Further, 40 is a secondary coil, and although it will not be described in detail, the electric gear side of the present invention adopts electromagnetic induction charging, and the suspension claws 42 and 42 of the winding frame 41 are connected to the lower cylinder 8. They are hung by hanging from hook pieces 43 and 43 formed at the lower end, respectively.

The drive unit A shown in FIG. 4 assembled in the above manner is inserted into the main body case 4 from below, and finally, although not shown, is housed in the main body case 4 by the bottom cover and the electric tooth side piece 3 is inserted into the main body case 4. Complete.

Therefore, as described above, the wall portion 9 having a semi-circular cross section extending upwardly from the support 7 in which the storage battery 11 is housed in the lower cylinder 8,
Motor 13, power transmission gear 26, and toothbrush drive shaft 6
To attach the fixing bracket 19 to the bracket 19, first, the motor 13 is brought into contact with the bottom plate part 23 of the bracket 19 and locked to form an integral part, and then the motor 13 is simply inserted from the side into the recess 3 in the wall part.
4, and lock the locking protrusion 32 on one side of the bracket bottom plate into the locking hole 35 of the wall portion 9, first locking only one side, then the switch portion S above the support body 7 and the storage battery. A conductive plate 36 connecting the bracket bottom plate 2 is arranged on the opposite side, and a hook hole 38 provided in the conductive plate 36
By hooking the locking hook 33 on the other side of the bracket 3, the motor 13 is held down from the side, and the bracket 19 is also completely fixed on the opposite side, making it possible to unitize the drive into a very compact unit. It can be part A.

That is, since the conductive plate 36, which is an electrical connection body, is also used as a fixing member of the assembly, it has a practical effect that the number of parts can be reduced and assembly can be made very easy.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; Fig. 1 is an external view of the electric toothbrush inserted into the charging stand and being charged; Fig. 2 is a vertical sectional side view of the main parts of the electric toothbrush body; Figure 3 is a cross-sectional view of the main parts taken in a direction perpendicular to Figure 2, Figure 4 is an external view of the assembled drive unit, and Figure 5 is an exploded perspective view of the main parts that make up the drive unit. It is. 11...Storage battery, 8...Cylinder for storage,
9...Wall portion having a semicircular arc shape in cross section, 7...Synthetic resin support, 6...Toothbrush drive shaft, 26...
...Drive gear, 19...Bracket,
23... Bracket bottom plate, 13... Motor, 34... Recess in wall, 32...
- Locking protrusion, 35... Locking hole, S...
Switch, 36... Conductive plate, 14...
Cylinder peripheral surface protrusion, 38...Latching hole, 33...
...Latching hook piece.

Claims (1)

[Scope of utility model registration request] A support made of synthetic resin, which has a cylindrical part for storing a storage battery in its lower part, and a wall part having a semicircular arc in cross section is integrally formed from the upper surface of the support, and a bracket that pivotally supports a toothbrush drive shaft and its drive gear. a motor is abutted and locked on the lower surface of the bracket bottom plate to fit into the recess in the wall from the side,
a conductive plate that engages a locking protrusion on one side of the bracket bottom plate with a locking hole formed in the wall portion, and connects the storage battery and a switch provided above the support body to the opposite side surface of the bracket and the motor; and the lower end of the conductive plate is hooked to a protrusion on the circumferential surface of the cylindrical portion, and the upper hooking hole is hooked to a hook on the other side of the bracket bottom plate, respectively. .