Abstract: A wheel includes a metal rim, an electrically conductive hub, a thermoelectric device, and a battery. The metal rim is exposed out of a circumference surface of the wheel for contacting with the ground. The thermoelectric device is connected between the metal rim and the electrically conductive hub for generating electric energy using temperature difference between the metal rim and the electrically conductive hub. The battery has two electrodes connected to the metal rim and the electrically conductive hub, respectively. The battery is configured for collecting electric energy generated by the thermoelectric device.

Abstract: A wheel includes a main body, a tire, a movable fixing pin, an electromagnet, and an elastic member. The tire is sleeved on the main body and defines a fixing hole. The tire is operable to rotate around the main body. The fixing pin is operable to be inserted into the fixing hole to fix the tire to the main body. The electromagnet is operable to attract the fixing pin to separate the fixing pin from the tire when the electromagnet is powered on. The elastic member is disposed between the electromagnet and the fixing ping, and pushes the fixing pin into the fixing hole when the electromagnet is powered off.

Abstract: A wheel assembly includes a shaft and a pair of wheels rotatably connected to opposite ends of the shaft. Each wheel includes an inner cover, an outer cover connected to the inner cover, and a steering member sandwiched between the inner cover and the outer cover. The steering member includes a motor, a rotating plate, at least two elastic elements equidistant from each other around the inner cover, and at least two pawls rotatably connected to the outer cover. The motor is fixed on the inner cover and includes a rotating shaft. The rotating plate is fixed to the rotating shaft and is driven by the motor to rotate. Each elastic element connects the rotating plate to each pawl. Each pawl extends out of the inner cover by rotation of the rotating plate, thereby changing the radius of the wheel.

Abstract: The present disclosure provides a motor overload protection device. The motor overload protection device includes a driving gear, a loading wheel, and at least one protecting gear unit rotatably fixed to the loading wheel. The loading wheel defines a central through hole for rotatably receiving a rotor of a motor. The driving gear is fixed on the rotor. The at least one protecting gear unit is rotated by the rotor. A resistance between the at least one protecting gear unit and the loading wheel is predetermined. When the load on the loading wheel is less than or equal to the maximum load of the motor, the resistance keeps the loading wheel and the at least one protecting gear unit together rotating around the rotor of the motor. When the load is greater than the maximum load of the motor, the at least one protecting gear unit rotates relative to the loading wheel.

Abstract: A replica eye includes an eyeball with a light-transmitting area for transmitting light, a resilient film, a driving member, and a transmission mechanism. The resilient film includes a pupil portion and an iris portion surrounding the pupil portion. The pupil portion is in a first color. The iris portion is in a second color other than the first color. The driving member has a shaft. The driving member provides rotating forces to the shaft. The transmission mechanism comprises a rotor fastened on the shaft of the driving member, and a plurality of flexible members in radial arrangement. A first end of each flexible member away from the rotor is fastened on an outer edge of the resilient film. When the driving member rotates the transmission mechanism, centrifugal forces are imparted on the plurality of flexible members, the plurality of flexible members stretches the pupil portion and the iris portion.

Abstract: A simulated eye capable of being changed between a contracted state and a dilated state. The simulated eye includes a semispherical eyeball having a transparent portion, a inductive coil, and an elastic film. The inductive coil coils around the elastic film, a size of the coil elastic film is changeable when being operationally supplied with electricity. When the inductive coil drives the elastic film, a size of the elastic film is changeable, whereby the simulated eye is changed between the contracted state and the dilated state.

Abstract: A simulated eye includes a semi-spherical eyeball with a light-transmitting area, a light source, a light transmitting board, and a photochromic layer. The light transmitting board disposed between the eyeball and the light source faces the light-transmitting area. The light transmitting board includes a first portion and a second portion surrounding the first position. The first portion is in a first color. The second portion is in a second color other than the first color. The photochromic layer is formed by photochromic materials coated on a side of the second portion facing the light source. When the light source is turned on, the emitted light irradiates the photochromic layer, whereby an area of the second portion covered by the photochromic layer changes from the second color to a third color similar to or the same as the first color.

Abstract: A simulated eye includes an eyeball, a first winding mechanism with a spool, a first driving member, a second winding mechanism with a reel, a second driving member and a strip. The first driving member is configured for driving the first winding mechanism to rotate in a first direction and a second direction opposite to the first direction. The second driving member is configured for driving the second winding mechanism to rotate in the first direction and the second direction. The strip has two ends wound around the spool and the reel correspondingly. The strip is wound around the spool when the first driving member and the second driving member rotate the first winding mechanism and the second winding mechanism in the first direction correspondingly.

Abstract: A battery casing used in an electrical device includes a box body, an electric sheet, a resilient electric portion and a switch apparatus. The box body for receiving a battery has a first sidewall and a second sidewall opposite to the first sidewall. The electric sheet mounted on an inner surface of the first sidewall is capable of electrically connecting with a first electrode of the battery. The resilient electric portion mounted on an inner surface of the second sidewall is capable of electrically connecting with a second electrode of the battery, and compressible to generate restoring forces. The switch apparatus mounted on an outer side of the first sidewall switches between a first position and a second position. When the switch apparatus is in the first position, the first electrode of the battery is detached from the electric sheet.

Abstract: A simulated eye includes a spherical cap eyeball, a resilient film, a driving mechanism, and a transmission mechanism. The eyeball includes a plurality of guide arms on an inner surface thereof. The resilient film received in the eyeball includes a pupil portion and an iris portion surrounding the pupil portion. The driving mechanism provides a first driving force and a second force opposite to the first driving force in direction. The transmission mechanism arranged between the driving mechanism and the resilient film includes a plurality of transmission members received and movable in the corresponding guide arms.

Abstract: A crawling device includes a first end with a first magnet recessed therein, a second end with a second magnet recessed therein, an elastic member disposed between the first end and the second end, a power source module, and a controller. When the first and second ends are supported on a supporting surface, and the controller connects the power source module to the first end and the elastic member, the first magnet extends beyond the first end onto the supporting surface and the elastic member becomes compressed toward the first end. When the elastic member is compressed, and the controller connects the power source module to the second end, the second magnet extends beyond the second end onto the supporting surface and the elastic member returns to the normal state.

Abstract: The present disclosure relates to a compressible mechanism for a toy. The compressible mechanism includes a first mounting portion, a second mounting portion, a coil spring, a power source, and a switch. The first mounting portion is capable of being secured to a part of the toy. The second mounting portion is capable of being secured to another part of the toy. The coil spring is made of electromagnetic material. The coil spring includes a first end and a second end, the first end and the second end are connected to the first mounting portion and the second mounting portion respectively. The power source is configured for providing a voltage across the coil spring. The switch is used for turning on or turning off the voltage across the coil spring.

Abstract: A toy eye includes a front cover, a rear cover and an iris assembly. The front cover defines a first through hole. The rear cover is coupled to the front cover to cooperatively define a receiving cavity. The iris assembly is received in the receiving cavity and includes a fixed supporting portion, an elastic pupil portion, a metallic body and an electromagnet. The supporting portion defines a second through hole. The pupil portion is attached to the supporting portion. The metallic body is fixed to the pupil portion and runs through the second through hole. The electromagnet is fixed to the rear cover and aligned with the metallic body.