A hinged mobile computing device includes a first housing part with a first display and a second housing part with a second display. The first and second housing parts are coupled by a hinge assembly that includes a spring-loaded opening mechanism configured to bias with a biasing torque the first housing part and second housing part to rotate away from each other when the first and second displays are in a closed face-to-face orientation. An electro-magnetic closure system is configured to retain the first and second displays in the closed face-to-face orientation against the biasing torque of the spring-loaded opening mechanism, and release of the electro-magnetic closure system permits the first housing part to rotationally separate from the second housing part to a predetermined angular orientation due to the biasing force of the spring-loaded opening mechanism.

The description relates to devices, such as computing devices that have hinged portions. One example can include a first portion and a second portion. This example can also include a hinge assembly that can rotatably secure the first portion to the second portion with a flexible hinge that is biased into the second portion such that a length of the flexible hinge exposed between the first and second portions changes as the first and second portions are rotated through a range of angular orientations.

A hinge and joint for a pair of eyeglasses is disclosed. A split frame has upper and lower rim end pieces that bend and extend rearwardly. A vertically-extending hollow shaft is provided on the end of a temple. A spring or springs are positioned laterally between the rim end pieces and the shaft, such that the shaft bears against the spring or springs. A U-shaped housing fits over the exterior top, bottom, and side of the joint and has a pair of aligned slots in top and bottom flanges. A pin is placed through the aligned slots in the housing and the shaft of the temple. Lateral force provided by the spring or springs biases the joint away from the aligned position, and that force, in combination with upper and lower shoulders on the pin, keep the joint and hinge together.