Mobile terminal device including an elevating keyboard mechanism

A mobile terminal device, comprising:

• an upper housing;
• a lower housing including a first outer face substantially covered by the upper housing after a closing event;
• a key operation section mounted on a key mount plate and housed in the lower housing and configured to ascend through said first outer face in an opening event;
• a slide mechanism interconnecting the upper housing and the lower housing and configured to slide along an open direction and a close direction, the open direction being a direction in which the key operation section, covered by the upper housing in the closing event, is exposed, and the close direction being a direction in which the key operation section, exposed in the opening event, is covered by the upper housing;
• and
• an elevation mechanism mechanically coupled to the slide mechanism and configured to drive the key operation section to ascend from inside the lower housing in response to a force transferred to the elevation mechanism from a sliding movement of the slide mechanism in the open direction, and configured to drive the key operation section from an ascended state into the lower housing in response to a force transferred to the elevation mechanism from a sliding movement of the slide mechanism in the close direction, wherein
• the elevation mechanism comprises
• a support frame including a first spring anchor, the support frame pivotally connected to a first end of the key mount plate;
• a first rotational connector including a second spring anchor, the first rotational connector pivotally connected to the support frame;
• a spring anchored to the first spring anchor of the support frame and to the second spring anchor of the first rotational connector;
• and
• a second rotational connector pivotally connected to the first rotational connector and pivotally connected to a second end of the key mount plate.