Abstract: A detachable pivoting chassis includes an accommodating base, a seat, a keyboard, a pivot module and a movable stand, and the accommodating base has an accommodating part for accommodating an electronic device, and the seat has an accommodating part for accommodating a keyboard, and the pivot module has at least two connecting elements and a pivoting element, and the connecting element is disposed on a side of the accommodating base and detachably coupled to the pivoting element, such that the accommodating base can be pivoted by the pivot module, and an end of the movable stand is pivotally coupled to an external side of the accommodating base, so that the electronic device can change its using status according to user requirements, and the detachable pivoting chassis can be combined with other electronic devices to provide the convenience of use.

Abstract: A photoelectric control unit installed in a video game machine and operated to control the motion of a controlled object in the screen of a display unit of the video game machine, the photoelectric control unit including a housing, a steering column installed in the housing and rotated with a steering wheel, a torsional spring mounted on the steering column, the torsional spring having one end fixedly fastened to the steering column and an opposite end fixedly connected to a fixed spring holder inside the housing, and a photoelectric controller formed of an optical transmitter and detector assembly and a signal processing circuit board for detecting rotary motion of the steering column and outputting to the display unit of the video game machine a signal indicative of rotary motion of the steering column.