A hinge module assembled to a first body and a second body of an electronic device and including a first rotating shaft assembled to the first body and having a first limiting portion, a second rotating shaft movably and rotatably assembled to the second body, a linking member, a switching member, and a transmission couple is provided. The second rotating shaft is fixed to the linking member and has a second limiting portion. The first rotating shaft is rotatably assembled to the linking member. The switching member movably passes through the linking member. The first limiting portion and the second limiting portion are located at two opposite ends of a moving path of the switching member to be interfered therewith. The transmission couple is respectively disposed at the second rotating shaft and the second body.

A hinge mechanism with multiple preset positions is described. According to various embodiments, the hinge mechanism enables a support component to be adjustably attached to an apparatus, such as a computing device. In at least some embodiments, the hinge mechanism utilizes preset hinge positions that enable the support component to be placed at different preset positions. For instance, the hinge mechanism is configured such that an attached support component tends to snap into various preset positions. In at least some embodiments, the hinge mechanism includes an emergency escape position that enables the support component to be rotated beyond normal operating positions without damaging the support component.

A hinge mechanism with multiple preset positions is described. According to various embodiments, the hinge mechanism enables a support component to be adjustably attached to an apparatus, such as a computing device. In at least some embodiments, the hinge mechanism utilizes preset hinge positions that enable the support component to be placed at different preset positions. For instance, the hinge mechanism is configured such that an attached support component tends to snap into various preset positions. In at least some embodiments, the hinge mechanism includes an emergency escape position that enables the support component to be rotated beyond normal operating positions without damaging the support component.

PROBLEM: To stably support a door.

SOLUTION: A door device includes: an engagement member provided in a variable link equipped with a variable connection length mechanism; and a cam member provided on a door and having a cam groove with which the engagement member engages. Furthermore, an extension end of the cam groove that comes into close proximity to an engagement part of the engagement member that moves within the cam groove, based on full opening movement of the door is an opening side end of the cam groove. The cam groove has a groove width change section being set on an opening side of the extension region including the opening side end, and a groove width of the cam groove in this groove width change section is narrower than a groove width on a closing side of the extension region beyond the groove width change section.