# Patent

## Title
Toy top

## Abstract

A toy top equipped with a motor having a battery as a power source, wherein a main body is furnished with: a first wheel and a second wheel provided a specified distance from each other in a wheel axis direction; and a motive power transmission mechanism, for transmitting motive power from the motor and for rotating the first wheel in a first direction while rotating the second wheel in a second different direction The toy top is stable with respect to external forces and with which a range of top games can be broadened.

## Background
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a National Stage application under 35 U.S.C. Section 371 of PCT International Application No. PCT/JP2014/060737, filed Apr. 15, 2014, the contents of which are incorporated herein by reference.
TECHNICAL FIELD
The present invention relates to a toy top.
BACKGROUND ART
A toy top that includes a motor to rotate a spinning shaft is disclosed in, for example, Patent Document 1 as an electric toy top.
PRIOR ART DOCUMENT
Patent Document 1: JP S54-114344 A
In the electric toy top described in Patent Document 1, since the toy top is supported by a single spinning shaft, the position may become too unstable when it is subjected to an external force.
Another problem is that, the toy top cannot be started from a state of being placed on a floor, since the standing position cannot be maintained at a low spinning speed.
SUMMARY OF INVENTION
It is an object of the present invention to provide a toy top that is relatively stable against external forces, can be started from a state of being placed on a floor, and that can therefore widen the ways to play with toy tops.
The invention can include a toy top having a battery and a motor powered by the battery,
wherein a main body includes:
a first wheel and a second wheel that are disposed at a predetermined distance from each other along a wheel axis; and
a power transmission mechanism that is capable of transmitting a power of the motor to rotate the first wheel in a first direction and to rotate the second wheel in a second direction that is different from the first direction.
The invention can include a toy top according to the above, wherein the motor is a reversible motor.
The invention can include a toy top according to the above, wherein the power transmission mechanism is configured such that when the motor rotates in a forward direction, the first wheel rotates in the first direction and the second wheel rotates in the second direction, and when the motor rotates in a reverse direction, the first wheel rotates in the first direction and the second wheel is disconnected from power transmission.
The invention can include a toy top according to the above, wherein the main body further includes a lock that locks rotation of the second wheel when the motor rotates in the reverse direction.
The invention can include a toy top according to the above,
wherein the power transmission mechanism includes:

    
    
        a sun gear coupled to the motor;
        a first planetary gear and a second planetary gear that are engaged with the sun gear;
        a first gear train coupled to the first wheel; and
        a second gear train coupled to the second wheel,
    
    


wherein when the motor rotates in the forward direction,

    
    
        the first planetary gear is coupled to the first wheel through an even or odd number of first power transmission gear in the first gear train, and the second planetary gear is coupled to the second wheel through a specified number of second power transmission gear in the second gear, in which the specified number has a same parity as the number of the first transmission gear, and
    
    


wherein when the motor rotates in the reverse direction,

    
    
        the second planetary gear is coupled to the first wheel through a specified number of third power transmission gear in the first gear train, and the first planetary gear is not engaged with any gear in the second gear train, in which the specified number has different parity from the number of the first transmission gear.
    
    


The “same parity” means that if one is an even number, then the other is also an even number. If one is an odd number, then the other is also an odd number. The “different parity” means that if one is an even number, then the other is an odd number. If one is an odd number, then the other is an even number.
The invention can include a toy top according to the above, wherein the first planetary gear and the second planetary gear are supported by an arm that swings about an axis of the sun gear, and
wherein the lock mechanism includes a part to be locked that is integrally formed with one of gears in the second gear train, and a locking part that is disposed in the arm and that locks the part to be locked when the motor rotates in the reverse direction so as to lock rotation of the second wheel.
With the above, the top body does not have a spinning shaft (axis rod) but spins by means of a pair of wheels. Therefore, novel and innovative toy tops can be achieved. Further, since the top body stands on the pair of wheels, the spinning position is relatively stable. This is particularly advantageous during startup or the like when the spinning speed is low. Further, the toy top is driven by the motor. Therefore, toy tops that can stably spin for a long time can be achieved. In this case, inexpensive toy tops can be achieved by using only a single motor.
With the above, not only does the pair of wheels rotate in mutually opposite directions, but also the rotational direction of the motor can be reversed. This enables the toy top to perform a variety of motions. Therefore, toy tops that perform novel motions can be achieved.
With the above, not only does the pair of wheels rotate in mutually opposite directions, but also the rotational direction of the motor can be reversed so that one of the wheels is disconnected from power transmission. This can make the toy top perform different motions. Therefore, toy tops that perform novel motions can be achieved.
With the above, the rotation of the second wheel is locked when the motor rotates in the reverse direction. This makes the motion of the toy top unstable compared to the state in which the pair of wheels rotates in mutually opposite directions. Accordingly, depending on the conditions of the floor on which the toy top is placed when playing, the spinning speed of the toy top and the like, the toy top performs a variety of amusing motions, such as a circulating motion. For battle toy tops for example, such motions are effective in order to dodge an attack. In particular, when the toy top transits from the state in which the pair of wheels rotates in mutually opposite directions to the state in which the rotation of one of the wheels is locked, it is possible to enjoy a more drastic change of behavior.



BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a perspective view of a toy top according to an embodiment of the present invention, illustrating the outer appearance thereof.
FIG. 2 is an exploded perspective view of the toy top according to the embodiment.
FIG. 3 is a perspective view of a main body lower portion of the toy top according to the embodiment, illustrating the inside of the main body.
FIG. 4 is a perspective view of a power transmission mechanism of the toy top according to the embodiment.
FIG. 5 is a plan view of the power transmission mechanism of the toy top according to the embodiment.
FIG. 6A is a plan view illustrating an operation of the power transmission mechanism.
FIG. 6B is a plan view of the toy top illustrating the behavior thereof when the power transmission mechanism operates as illustrated in FIG. 6A.
FIG. 7A is a plan view illustrating another operation of the power transmission mechanism.
FIG. 7B is a plan view of the toy top illustrating the behavior thereof when the power transmission mechanism operates as illustrated in FIG. 7A.
FIG. 8 is a perspective view of the toy top according to the embodiment from below.
FIG. 9 is a perspective view of an example of a battle stadium for the toy top according to the embodiment.



DETAILED DESCRIPTION
Hereinafter, a toy top according to embodiments of the present invention will be described.
OVERALL
1. Configuration
FIG. 1 is a perspective view of a toy top according to an embodiment of the present invention, illustrating the outer appearance thereof, and FIG. 2 is an exploded perspective view of the toy top.
The toy top 1 roughly includes a main body 10, an upper deck 11 disposed over the main body 10, side plates 12 protruding outward from the sides of the main body 10, and a bottom plate 13 disposed on the bottom of the main body 10. The main body 10 may instead not be provided with the upper deck 11, the side plates 12 or the bottom plate 13.
As illustrated in FIG. 2, the main body 10 includes a main body upper portion 10a and a main body lower portion 10b. Inside the main body 10, a motor 16 and batteries 28 are provided. Further, in the lower part of the main body 10, a pair of wheels 14a, 14b (see FIG. 8) is provided. Further, in the main body 10, a photosensor 29a and a power switch 29b are provided.
2. Outline of Action
When the power switch 29b of the toy top 1 is turned on and then a hand is held over the toy top 1 such that the hand passes over the toy top 1 once, the toy top 1 spins in the same location. When a hand is held over the toy top 1 such that the hand passes over the toy top 1 twice in a predetermined short time, the toy top spins and performs a variety of actions such as a large circling action. When a hand is held over the toy top 1 for a long time, the toy top 1 stops the action, although it is not particularly limited thereto.
Hereinafter, details of the toy top 1 will be described.
DETAILS
1. Configuration of Main Body 10
As illustrated in FIG. 3, the main body lower portion 10b has a bowl shape. As illustrated in FIG. 8, the main body lower portion 10b rotatably supports the wheels 14a, 14b at the left and right sides across the center axis.
A frame 15 is disposed between the left and right wheels 14a, 14b, and a reversible motor 16 is disposed therein. The reversible motor 16 is attached in the frame 15 such that the shaft thereof extends in the vertical direction and protrudes downward. Further, the main part of a power transmission mechanism 17 is mounted in the frame 15, which is capable of coupling the reversible motor 16 with the left and right wheels 14a, 14b. 
In the main body lower portion 10b, three AAA batteries 28 are disposed, but they are not particularly limited thereto. The three batteries 28 are disposed surrounding the frame 15 from three directions. The three batteries 28 are electrically connected in series when they are disposed in the main body lower portion 10b. 
The toy top 1 also includes a controller 29c that controls the motor 16. The controller 29c is housed in a control box 29 disposed in the upper part of the toy top 1. The controller 29c is constituted by a programmable logic circuit or a wired logic circuit.
On the upper surface of the control box 29, the photosensor 29a is disposed. The photosensor 29a detects the manner of a hand gesture, and the controller 29c controls the motor 16 based on the detection result. For example, when a hand is held over the toy top 1 such that the hand passes over the toy top 1 once, the controller 29c makes the toy top 1 spin in the same place by controlling the rotation of the motor 16. When a hand is held over the toy top 1 such that the hand passes over the toy top 1 twice in a predetermined short time T1, the controller 29c makes the toy top 1 perform a variety of actions such as a large circling action by controlling the rotation of the motor 16. When a hand is held over the toy top 1 for a long time, the controller 29c makes the toy top 1 stop the action by controlling the rotation of the motor 16. When another hand gesture is performed while the toy top 1 is spinning according to a certain hand gesture, the controller 29c switches the action of the toy top 1.
The controlling manner of the controller 29c is not limited thereto. For example, while the toy top 1 is spinning at the same place after a hand is held over the toy top 1 once, when a hand is held over the toy top 1 once again for a time period longer than the time T1, the controller 29c may increase the spinning speed of the toy top 1 by controlling the rotation of the motor 16.
2. Power Transmission Mechanism
Next, the power transmission mechanism 17 will be described based on FIG. 4 through FIG. 7.
A pinion 21 is fixed to a shaft 16a of the motor 16. The pinion 21 serves as a sun gear of a planetary gear mechanism. The pinion 21 is engaged with a gear 20a and a gear 20b. The gear 20a and the gear 20b are disposed sandwiching the pinion 21. The gear 20a and the gear 20b serve as planetary gears of the planetary gear mechanism. The gear 20a and the gear 20b are supported about respective axes by an arm 18 that is swingable about the shaft 16a of the motor 16. Specifically, the arm 18 is swingably supported at the center part thereof by the shaft 16a of the motor 16, the gear 20a is supported at one end of the arm 18 by a shaft 19a, and the gear 20b is supported at the other end of the arm 18 by a shaft 19b. 
In the wheel 14a, which is one of the wheels, a crown gear 23a is provided. The crown gear 23a is engaged with a gear 24a. Further, the gear 24a is engaged with a gear 25a. The crown gear 23a and the gears 24a, 25a constitute a second gear train. In the gear 24a, a part to be locked 27b with three hooks is integrally provided.
In the right wheel 14b, a crown gear 23b is provided. The crown gear 23b is engaged with a gear 24b. Further, the gear 24b is engaged with a gear 25b. The crown gear 23b and the gears 24b, 25b constitute a first gear train.
In the power transmission mechanism 17, for example, when the pinion 21 rotates in the anti-clockwise direction as illustrated in FIG. 6A, the arm 18 swings in the anti-clockwise direction due to rotation of the gears 20a, 20b. As a result of the swing of the arm 18 in the anti-clockwise direction, the gear 20a engages with the gear 25a, and the gear 20b engages with the gear 25b. Accordingly, the rotation of the pinion 21 of the motor 16 is transmitted to the crown gear 23a through the gears 20a, 25a, 24a so that the wheel 14a rotates in the arrow direction. Also, the rotation of the pinion 21 of the motor 16 is transmitted to the crown gear 23b through the gears 20b, 25b, 24b so that the wheel 14b rotates in the arrow direction.
As a result, the wheels 14a, 14b rotate in mutually opposite directions. Therefore, the toy top 1 spins in the same place as illustrated in FIG. 6B.
The power transmission mechanism 17 also has a clutch mechanism. The clutch mechanism disconnects the power transmission to the wheel 14a when the pinion 21 rotates in the opposite direction (clockwise direction). For this configuration, in the toy top 1 according to the embodiment, the gear 20b of the arm 18 and the gear 24a are offset from each other in the vertical direction as illustrated in FIG. 4.
The operation of the clutch mechanism will be described. As illustrated in FIG. 7A, when the pinion 21 rotates in the clockwise direction, the arm 18 swings in the clockwise direction, and the gear 20a engages with the gear 24b. The gear 24b transmits the rotation of the pinion 21 to the wheel 14b, so that the wheel 14b rotates in the arrow direction. While the rotation of the pinion 21 is transmitted to the gear 20b, it is not transmitted from the gear 20b to the gear 24b since the gear 20b and the gear 24b do not engage with each other. Accordingly, the wheel 14a is released.
The power transmission mechanism 17 also has a brake (lock) mechanism. The brake mechanism 27 regulates the rotation of only one of the pair of wheels 14a, 14b (wheel 14a in the embodiment). As illustrated in FIG. 4, the brake mechanism 27 includes a locking part 27a disposed at the tip of the arm 18 and a part to be locked 27b disposed coaxially and integrally with the gear 24a. 
The brake (lock) mechanism is not necessarily provided.
In the brake mechanism, as illustrated in FIG. 7A, when the pinion 21 rotates in the clockwise direction and the arm 18 thereby swings in the clockwise direction, the locking part 27a of the arm 18 engages with (comes in contact with) the part to be locked 27b that is integrally formed with the gear 24a. That is, although the power transmission from the motor 16 has been disconnected, the wheel 14a rotates by being driven by the running wheel 14b, and the part to be locked 27b thereby engages with the locking part 27a of the arm 18. As a result, the rotation of the gear 24a is locked, and the rotation of the wheel 14a is locked accordingly.
In this way, while the wheel 14b rotates, the rotation of the wheel 14a is locked. As a result, for example, the toy top 1 makes a large circle about the wheel 14a as illustrated in FIG. 7B.
3. Wheels 14a, 14b 
Among the pair of wheels 14a, 14b, the free rotatable wheel 14b may be made of a highly frictional material such as rubber in order to increase the grip performance against a ground surface such as a floor. Alternatively, a rubber ring or the like may be fitted around the periphery of the wheel 14b. The locked non-rotatable wheel 14a has low friction compared to the wheel 14b. In principle, the motion of the toy top 1 becomes larger as the gripping performance of the wheel 14a is increased, but this also increases the load on the motor 16 and therefore decreases the rotation speed. The above configuration is determined considering the balance between the gripping performance and the rotation speed. When it is not necessary to consider the balance, it is needless to say that the gripping performance of the wheel 14a may be increased.
4. Upper Deck 11
The upper deck 11 of the toy top 1 also serves to change the position of the center of gravity of the toy top 1. By replacing the upper deck 11 with another one with a different weight, the position of the center of gravity of the toy top 1 can be changed in the vertical direction. Further, the upper deck 11 may also serve as a flywheel.
As illustrated in FIG. 2, the upper deck 11 is formed in a disk shape and has a rectangular hole 11a in the center. The control box 29 disposed in the upper part of the main body upper portion 10a is fitted in the hole 11a so that the upper deck 11 is supported.
5. Side Plates 12
The side plates 12 are weapons for fighting the other toy top 1. A variety of side plates 12 with different outer shapes are prepared, and a suitable set is selected and attached to the main body 10. As illustrated in FIG. 2, each of the side plates 12 has a cutout (or a hole) 12a in the middle part. Pins 30 are implanted on the main body lower portion 10b, and the side plates 12 are held between the main body lower portion 10b and the main body upper portion 10a with the pins 30 inserted in the cutouts 12a. 
6. Bottom Plate 13
When the bottom plate 13 comes in contact with a ground surface such as a floor, it causes a change of the behavior due to a change of the load applied thereto. A variety of bottom plates 13 with different uneven shapes of the bottom are prepared, and a suitable one can be selected to enjoy the change. The bottom plate 13 has a hole 13a in the center part thereof, and the bottom of the main body 10 is fitted in the hole 13a so that the bottom plate 13 is supported.
HOW TO PLAY
As illustrated in FIG. 9, players can play with the toy tops 1 with the above-described configuration, for example, by making them fight each other in a battle stadium 31. The battle stadium 31 includes an approximately circular field 31a and U-shaped standby spaces 31b for housing the toy tops 1 at the respective ends of a diameter. The players place the respective toy tops 1 in the standby spaces 31b and start them. Then, the toy tops 1 move toward the center of the field 31a. By using the battle stadium 31, the players can play a game in which a player loses the game when his/her toy top 1 drops out of the field 31a. 
While embodiments of the present invention are described above, the present invention is not limited to the above-described embodiments, and it should be understood that various changes can be made without changing the features of the present invention.
The present invention can be suitably applied to manufacturing of spinning top toys.

## Claims

1. A toy top, comprising:
a main body;
a battery; and
a motor powered by the battery,
wherein the main body, includes a first wheel and a second wheel that are disposed at a predetermined distance from each other along a wheel axis; and
a power transmission mechanism that transmits power from the motor to rotate the first wheel in a first direction and to rotate the second wheel in a second direction that is different from the first direction,
wherein the power transmission mechanism is configured such that, when the motor rotates in a forward direction, the first wheel rotates in the first direction and the second wheel rotates in the second direction, and when the motor rotates in a reverse direction, the first wheel rotates in the first direction and the second wheel is disconnected from the power transmission so that the second wheel is not driven by the motor.

2. The toy top according to claim 1, wherein the main body further comprises a lock mechanism that prevents rotation of the second wheel when the motor rotates in the reverse direction.

3. The toy top according to claim 2,
wherein the power transmission mechanism comprises:
a sun gear coupled to the motor;
a first planetary gear and a second planetary gear that are engaged with the sun gear;
a first gear train coupled to the first wheel; and
a second gear train coupled to the second wheel,

wherein, when the motor rotates in the forward direction, the first planetary gear is coupled to the first wheel through an even or odd number of first power transmission gears in the first gear train, and the second planetary gear is coupled to the second wheel through a specified number of second power transmission gears in the second gear train, in which the specified number has a same parity as the number of the first power transmission gears, and
wherein, when the motor rotates in the reverse direction, the second planetary gear is coupled to the first wheel through a specified number of third power transmission gears in the first gear train, and the first planetary gear is not engaged with any gear in the second gear train, in which the specified number has different parity from the number of the first power transmission gears.

4. The toy top according to claim 3,
wherein the first planetary gear and the second planetary gear are supported by an arm that swings about an axis of the sun gear, and
wherein the lock mechanism comprises a part to be locked that is integrally formed with one of the gears in the second gear train, and a locking part that is disposed in the arm and that locks the part to be locked when the motor rotates in the reverse direction so as to prevent rotation of the second wheel.

5. The toy top according to claim 1, wherein the main body comprises a removably mounted upper body portion selected from a plurality of upper body portions, each having a different weight.

6. The toy top according to claim 1, wherein the main body comprises a removably mounted side portion selected from a plurality of side portions, each having a different shape.

7. The toy top according to claim 1, wherein the main body comprises a removably mounted lower body portion selected from a plurality of lower body portions, each having a different shape.

8. A toy, comprising:
a playing field having separated standby portions on a periphery thereof;
at least two of the toy tops recited in claim 1, each being positioned in one of the standby portions.

9. A toy top, comprising:
a main body;
a battery; and
a reversible motor powered by the battery,
wherein the main body, includes—
a first wheel and a second wheel that are disposed at a predetermined distance from each other along a wheel axis, and
a power transmission mechanism that is capable of transmitting a power of the motor to rotate the first wheel in a first direction and to rotate the second wheel in a second direction that is different from the first direction,
wherein the power transmission mechanism is configured such that when the motor rotates in a forward direction, the first wheel rotates in the first direction and the second wheel rotates in the second direction, and when the motor rotates in a reverse direction, the first wheel rotates in the first direction and the second wheel is disconnected from the power transmission, and
wherein the main body further comprises a lock mechanism that prevents rotation of the second wheel when the motor rotates in the reverse direction.

10. The toy top according to claim 9,
wherein the power transmission mechanism comprises:
a sun gear coupled to the motor;
a first planetary gear and a second planetary gear that are engaged with the sun gear;
a first gear train coupled to the first wheel; and
a second gear train coupled to the second wheel,

wherein, when the motor rotates in the forward direction, the first planetary gear is coupled to the first wheel through an even or odd number of first power transmission gears in the first gear train, and the second planetary gear is coupled to the second wheel through a specified number of second power transmission gears in the second gear train, in which the specified number has a same parity as the number of the first power transmission gears, and
wherein, when the motor rotates in the reverse direction, the second planetary gear is coupled to the first wheel through a specified number of third power transmission gears in the first gear train, and the first planetary gear is not engaged with any gear in the second gear train, in which the specified number has different parity from the number of the first power transmission gears.

11. The toy top according to claim 10,
wherein the first planetary gear and the second planetary gear are supported by an arm that swings about an axis of the sun gear, and
wherein the lock mechanism comprises a part to be locked that is integrally formed with one of the gears in the second gear train, and a locking part that is disposed in the arm and that locks the part to be locked when the motor rotates in the reverse direction so as to lock rotation of the second wheel.

12. The toy top according to claim 9, wherein the main body comprises a removably mounted upper body portion selected from a plurality of upper body portions, each having a different weight.

13. The toy top according to claim 9, wherein the main body comprises a removably mounted side portion selected from a plurality of side portions, each having a different shape.

14. The toy top according to claim 9, wherein the main body comprises a removably mounted lower body portion selected from a plurality of lower body portions, each having a different shape.

15. A toy, comprising:
a playing field having separated standby portions on a periphery thereof;
at least two of the toy tops recited in claim 9, each being positioned in one of the standby portions.