JPS61103404A - Electromotive toothbrush - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an electric toothbrush, and more specifically, for example, the scrubbing method (scrubbing approximately 10 mm), which is the basis of the brush crank on the upper surface of the teeth, and the @ side bathing method ( The present invention relates to an electric toothbrush that can carry out a stroke of approximately 5 mm.

(Prior Art and its Problems) Conventionally, electric toothbrushes have been known that convert the rotational motion of a motor into motion and cause a brush holder equipped with a brush at its tip to move back and forth in a straight line.

By the way, among this type of electric toothbrushes, an electric toothbrush that can switch between the scrubbing method and the bath method has not been put into practical use. The reason for this is that it is difficult to incorporate a stroke switching means into the small-diameter cylindrical body of the handshake part due to space constraints, and even if it were built in, there are practical problems such as increased size and cost. be.

(Effects of the Invention) This invention has been made in view of the above points, and its purpose is to select and use at least two different brush movement strokes represented by, for example, the scrubbing method and the bus method. To provide an electric toothbrush that can provide an optimal brushing effect, has an extremely simple structure, and can be implemented at low cost without increasing its size.

(Structure of the Invention) This invention is applied to an electric toothbrush that converts the rotational motion of a motor into motion and causes a brush holder equipped with a brush at the tip to move back and forth in a straight line. A rotating plate 22 that changes the size in multiple stages, for example, rotated by a motor, a movable switching plate 32 rotatably supported by a fulcrum shaft 30 at an eccentric position of the rotating plate 22, and a fulcrum on this movable switching plate 32. A crank pin 34 that extends apart from the shaft 30 and engages with a slide groove 44 provided in the brush holder, a regulating means that regulates the movement stroke of the movable switching plate 32 due to forward and reverse rotation of the rotary plate 22, and a motor pole. It is characterized by having a switching means constituted by a changeover switch 54 that reverses the emotion.

(Example) Examples of the present invention will be described in detail below with reference to the drawings.

In FIG. 1, a battery 12. A DC motor 14 driven by the battery 12 and capable of forward and reverse rotation by switching the polarity of the battery. A deceleration mechanism 20 for decelerating the rotation of the gear 18 attached to the rotating shaft 16 of the DC motor 14, a rotary plate 22 that rotates at low speed in a horizontal plane in the figure by the deceleration mechanism 20, and a horizontal rotation of the rotary plate 22 to the left and right. A brush holder 24 driven by the reciprocating device is capable of reciprocating in the direction and switching the stroke of the reciprocating motion. The portion 26 is inserted through the center of the portion 26 via the seal member 28 and is supported horizontally in the left-right direction at a position extending outward to the left.

The horizontal rotation of the rotating plate 22 is a reciprocating movement in the left and right direction,
Furthermore, the stroke of the brush holder 24
(The switching means for switching between two stages consists of a Scotch choke as a reciprocating slider crank mechanism. The crank of the Scotch choke is in contact with the upper surface of the rotary plate 22, and is located near the right end in FIG. 5, off the center of rotation of the rotary plate 22. The rotary plate of the movable switching plate 32 and a vertically elongated crank pin 34 protruding from the rear upper surface of the movable switching plate 32 having a triangular plate shape with rounded corners are supported by a pin-shaped fulcrum shaft 30 protruding from the upper surface of the rotating plate 22 at the position. 22 A guide groove 36 transparently provided in the center of the rotation switching plate shaped along the central axis of the rotation plate 22 and guide groove 3 that smoothly guides movement during forward and reverse rotation.
6 from above and is inserted into a through hole 38 provided at the center of the rotary plate 22 to rotatably support the rotary plate 22. The upper part of the guide shaft 40 has a flat disk shape, and this flat disk shaped portion prevents the movable switching plate 32 from rising above the rotary plate 22.

Reference numeral 42 denotes a gear portion provided on the lower circumferential side of the rotary plate 22, and is linked to the speed reduction mechanism 20. The crank pin 34 of the crank is inserted through a slide groove 44 provided in the middle of the brush holder 24 as a slider and extending in the front-rear direction in FIG. .

The support mechanism of the brush holder 24 is formed by a pair of horizontal guide grooves 50 formed by drilling a guide pin 46 in a support plate 48 in the handshake part 10, the right end of which passes vertically through the right end of the brush holder 24 in the front-rear direction in FIG. The left end of the brush holder 24 is slidably supported on a support 52 (see FIG. 3) having a downward semicircular sleeve-shaped recess 51. 54 is a switch applied to the DC motor 14 that turns on and off the power supply voltage from the battery 12; and a switch 54 that reverses the positive and negative in the on state to reverse the rotation direction of the rotary plate 22 and change the stroke of the brush holder 24. It's a switch. brush holder 24
Near and above the support body 52 is a movable contact that presses the brush holder 24 downward and is made of a leaf spring that extends in the left-right direction and is supported with its right end bent toward the center between the battery and the DC motor. This is a space in which a fixed contact fixed within the handshake part exists. The electric circuit having a contact circuit consisting of a movable contact and a fixed contact can be used as a circuit to activate a notification device to notify that the pressing force applied to the brush holder exceeds a certain value, or as a circuit to stop driving a DC motor. It can be used as At the left end of the brush boulder, a screw-fastening mechanism for replacing and attaching the toothbrush 56 is provided, but in order to provide flexibility in this part, the diameter is particularly reduced to prevent excessive pressing force from being applied to the toothbrush. is good.

In addition, in the present invention, the brush movement stroke of another brushing method may be generated by changing the movable switching plate 32 or the like. The present invention is not limited to other embodiments, and the present invention allows arbitrary changes in shape and detailed structure without departing from the gist of the present invention.

(Function of the Invention) In the above configuration, the stroke switching mechanism shown in FIG.
direction), the movable switching plate 32 is moved upward in FIG. 6 due to friction with the rotating plate 22,
Since the distance R1ta between the crank pin 34 and the guide shaft 40 is large, the slide groove 44 of the brush boulder 24 is
Drive left and right at a distance of .

Therefore, by setting 2a to be approximately 10 mm, brushing by the scrambling method can be performed.

Next, a lotus method brushing is performed to polish the side surfaces of the teeth, but in this case, it is sufficient to simply change the polarity of the power source of the DC motor 14 between positive and negative using the changeover switch 54 to reverse the direction of rotation. In this case, as shown in FIG.
2 directions), and at a position where the upper end of the guide groove 36 abuts the upper end of the guide shaft 40, the crank pin 3
4 approaches the guide shaft 40, which is the center axis of rotation of the rotary plate 22, so that the brush boulder reciprocates in the left-right direction at a distance of 2b, thereby automatically performing bus brushing.

(Effect of the invention) By switching the stroke of the electric toothbrush,
Two types of brushing methods can be adopted for both types. Moreover, it is extremely easy to switch, the switching mechanism is simple and extremely small, it operates reliably, the stroke can be changed arbitrarily, there is no drop in driving force even when the stroke is changed, and it is also inexpensive. It has great effects, such as being able to achieve.

[Brief Description of the Drawings] The drawings show embodiments of the present invention, and FIGS. 1 and 2 are a front partial sectional view, a plan partial sectional view, and FIGS. 3 and 4.
5 is a perspective view of the support, a plan view of the switch, and a perspective view of the switching mechanism, and FIGS. 6 and 7 are plan views of the switching mechanism. DESCRIPTION OF SYMBOLS 10... Handshake part, 12... Battery, 14... DC motor, 16... Rotating shaft, 18... Gear,
20... Reduction mechanism, 22... Rotating plate, 2
4... Brush holder, 26... Lid part, 30.
...Fulcrum shaft, 32...Movable switching plate, 34...
・Crank pin, 36... Guide groove, 38...
Through hole, 40... Guide shaft, 42... Gear part, 44... Slide groove, 46... Guide pin, 48... Support plate, 50... Recessed part,
52... Support body, 54... Changeover switch, 5
6... Toothbrush.

Claims (1)

[Scope of Claims] 1. An electric toothbrush that converts the rotational motion of a motor into motion to move a brush holder equipped with a brush at its tip in a reciprocating and linear motion, comprising a switching means for switching the stroke size of the brush holder into a plurality of stages. An electric toothbrush comprising: 2. The switching means is a rotating plate 22 rotated by a motor.
, a movable switching plate 32 rotatably supported by a fulcrum shaft 30 at an eccentric position of this rotary plate 22, and this movable switching plate 3.
2, a crank pin 34 that is raised apart from the fulcrum shaft 30 on the brush holder and engages with a slide groove 44 provided in the brush holder, and a regulating means that regulates the movement stroke of the movable switching plate 32 due to forward and reverse rotation of the rotary plate 22. The electric toothbrush according to claim 1, further comprising a changeover switch 54 for reversing the polarity of the motor.