Abstract: A hinge structure is shown for use in portable electronic devices, making it possible to turn a first housing part and a second housing part of the device in relation to an axis of rotation of a hinge structure, the hinge structure comprising a torsion spring, which has a first end and a second end and a longitudinal axis, and the first end of the spring is connected to a first hinge half and the second end of the spring is connected to a second hinge half in such a manner that the connection point of the second end of the spring is able to rotate around the axis of the spring.

Abstract: A modular spring system has a module body to accommodate a cam shaft holder on one end and a blocking surface on the other end. The cam shaft holder has a well to accommodate a cam shaft, allowing the cam shaft to rotate therein. The well has an open section and the cam shaft has a cam tip located near the open section. A slider with a protruding portion is used to press against the cam tip through the open section of the well to provide a nose-to-nose interface. A spring is inserted between the blocking surface and the slider to provide stability of a nose-to-nose interface position. Depending on the shape of the protruding portion of the slider and the shape of the cam tip, the modular spring system can have one, two or more stable nose-to-nose interface positions.

Abstract: A sliding assembly has a slider and at least one rail movably engaged with the slider for movement. The rail is coupled to a module operable in a number of module positions. A lever arm is connected between a pin on the slider and the module to change the module positions, such that when the module positions are caused to change, the slider is also caused to move relative to the rail. In a portable device, such as a mobile phone having a first device part and a second device part, the first device part can be fixedly mounted to the slider and the second device part can be fixedly mounted to the rail in order to achieve a sliding motion between the first and second device parts so as to allow the mobile phone to operate between closed and open positions.