Abstract: An electric treadmill includes a treadmill frame, an endless belt, a motor coupled to the endless belt for driving the endless belt to rotate, a brake device and a lifting device. The brake device has a rotating disc coaxially fixed to a motor shaft of the motor and a magnetic brake mechanism. The magnetic brake mechanism has at least one magnetic portion for applying a drag force against rotation of the rotating disc. The lifting device is operable to drive the magnetic brake mechanism to move between a first position where the magnetic portion is located close to the rotating disc and a second position where the magnetic portion is located away from the rotating disc. When there is no electric power supplied to the electric treadmill, the magnetic brake mechanism will automatically move to the first position due to gravity to stop rotation of the endless belt.

Abstract: A motor brake device of an exercise apparatus includes a motor, a brake device and a lifting device. The brake device has a rotating disc and a magnetic brake mechanism. The rotating disc is coaxially mounted on a motor shaft of the motor. The magnetic brake mechanism has at least one magnetic portion. The lifting device is configured to drive the magnetic brake mechanism to move between a first position where the magnetic portion is located close to the rotating disc and a second position where the magnetic portion is located away from the rotating disc. The second position is located higher than the first position. When there is no electric power supplied to the exercise apparatus, the magnetic brake mechanism can move downward to the first position to stop rotation of the motor shaft by gravity due to potential difference between the second position and the first position.

Abstract: A digital photo frame (DPF) capable of indicating battery is provided. The DPF includes a light-emitting diode (LED) unit, a battery, a battery detection unit, a processing unit, and a display control unit. The battery detection unit is connected to the battery and is configured to detect the charge of the battery and output a low battery alarm signal when the charge of the battery is below a predetermined value. The processing unit is connected to the battery detection unit, and is configured to producing a control signal when receiving the low battery alarm signal. The display control unit is connected to the processing unit and the LED unit, and is configured to control the LED unit to change its display state when receiving the control signal.

Abstract: A tube jointing structure comprises a first tube, a second tube at an angle with the first tube, and a reinforcing plate for connecting the first tube with the second tube. A portion of the reinforcing plate is bonded to the first tube and the remaining portion of the reinforcing plate is soldered to the first tube and the second tube.