Embodiments of the disclosure relate to a device including a first hollow body, a second hollow body, and a first hollow axle joining the first hollow body and the second hollow body. The device further includes a second axle coaxial with, and in slip-fit engagement with, the first hollow axle, a first flywheel connected to the solid axle and placed in the first hollow body, and a second flywheel connected to the solid axle and placed in the second hollow body. The device is one of a grinder and a climbing top. A method for operation of the grinder including a detachable lid and coupled to a string is also disclosed herein.

Embodiments of the disclosure relate to a device including a first hollow body, a second hollow body, and a first hollow axle joining the first hollow body and the second hollow body. The device further includes a second axle coaxial with, and in slip-fit engagement with, the first hollow axle, a first flywheel connected to the solid axle and placed in the first hollow body, and a second flywheel connected to the solid axle and placed in the second hollow body. The device is one of a grinder and a climbing top. A method for operation of the grinder including a detachable lid and coupled to a string is also disclosed herein.

A system of strongly coupled multiple Yo-Yos in series is disclosed in which very string that connects the successive Yo-Yos may be wrapped around Yo-Yos respective axles and therefore can be wound or unwound on both ends at the same time. Accordingly, both ends of the strings and their respective Yo-Yos may move with different speeds and accelerations. Yo-Yos in the system have a modular structure. The system also can be constructed with modular pieces to provide different operating modes when is set in motion. In embodiments, the Yo-Yos may be connected via the return strings. To ensure the Yo-Yo sides remain with equal length during the operation, a regulating mechanism is provided, and a regulating ring to keep the two sides of the return string in proximity, and assuring a long operation.

A system of strongly coupled multiple Yo-Yos in series is disclosed in which very string that connects the successive Yo-Yos may be wrapped around Yo-Yos respective axles and therefore can be wound or unwound on both ends at the same time. Accordingly, both ends of the strings and their respective Yo-Yos may move with different speeds and accelerations. Yo-Yos in the system have a modular structure. The system also can be constructed with modular pieces to provide different operating modes when is set in motion. In embodiments, the Yo-Yos may be connected via the return strings. To ensure the Yo-Yo sides remain with equal length during the operation, a regulating mechanism is provided, and a regulating ring to keep the two sides of the return string in proximity, and assuring a long operation.

There described a computerized yo-yo toy that uses an acceleration measuring device, a computation and control device, a communication device and entertaining devices to enhance the entertaining experience of playing with the computerized yo-yo toy. The acceleration measuring device measures the acceleration values of the computerized yo-yo toy. The computation and control device uses the measured acceleration values to generate control signals to control the entertaining devices such as a light display device, an audio play device and an auxiliary device for an enhanced entertaining experience. The entertaining devices may be latched to a latching base, which allows using different and new entertaining devices with the computerized yo-yo toy. The computation and control device may also use the measured acceleration values to generate control signals to control the motion of the computerized yo-yo toy, using an electric clutch device and an electric motor device. The control signals are based on the measured acceleration values, the type of entertaining device latched to the latching base and setup parameters received by the communication device from an external device, such as smartphone or tablet. The communication deice may also send data from the computerized yo-yo toy to the external device, which allows the external device to analyze, store or display the data for an enhanced entertaining experience.

There described a computerized yo-yo toy that uses an acceleration measuring device, a computation and control device, a communication device and entertaining devices to enhance the entertaining experience of playing with the computerized yo-yo toy. The acceleration measuring device measures the acceleration values of the computerized yo-yo toy. The computation and control device uses the measured acceleration values to generate control signals to control the entertaining devices such as a light display device, an audio play device and an auxiliary device for an enhanced entertaining experience. The entertaining devices may be latched to a latching base, which allows using different and new entertaining devices with the computerized yo-yo toy. The computation and control device may also use the measured acceleration values to generate control signals to control the motion of the computerized yo-yo toy, using an electric clutch device and an electric motor device. The control signals are based on the measured acceleration values, the type of entertaining device latched to the latching base and setup parameters received by the communication device from an external device, such as smartphone or tablet. The communication deice may also send data from the computerized yo-yo toy to the external device, which allows the external device to analyze, store or display the data for an enhanced entertaining experience.

The disclosure is direct to a tether assembly for use with a yoyo to limit the twisting of the tether when the yoyo is being used. The tether assembly includes a fixed member that is adapted to be releasably coupled to at least one finger of a user and a bearing member configured to be secured to the fixed member. The tether assembly also includes a flexible tether segment that is secured to the yoyo at a first end and to the bearing member at a second end. The connection of the flexible tether with the yoyo forms a first axis of rotation and the connection of the flexible tether with the bearing member forms a second axis of rotation to allow a user to use the yoyo without the tether twisting and binding.

The disclosure is direct to a tether assembly for use with a yoyo to limit the twisting of the tether when the yoyo is being used. The tether assembly includes a fixed member that is adapted to be releasably coupled to at least one finger of a user and a bearing member configured to be secured to the fixed member. The tether assembly also includes a flexible tether segment that is secured to the yoyo at a first end and to the bearing member at a second end. The connection of the flexible tether with the yoyo forms a first axis of rotation and the connection of the flexible tether with the bearing member forms a second axis of rotation to allow a user to use the yoyo without the tether twisting and binding.

A yo-yo includes: a shaft member; a string member supported by the shaft member; a first rotation portion rotatable around the shaft member; and a second rotation portion rotatable around the shaft member and rotatable relative to the corresponding first rotation portion. The second rotation portion is provided outside the first rotation portion in a direction in which the shaft member extends, the second rotation portion covers a partial area of the first rotation portion, and at least a part of the partial area is visible through the second rotation portion.

A yo-yo includes: a shaft member; a string member supported by the shaft member; a first rotation portion rotatable around the shaft member; and a second rotation portion rotatable around the shaft member and rotatable relative to the corresponding first rotation portion. The second rotation portion is provided outside the first rotation portion in a direction in which the shaft member extends, the second rotation portion covers a partial area of the first rotation portion, and at least a part of the partial area is visible through the second rotation portion.