Opening/closing mechanism for rotary cover

A rotation cover opening/closing mechanism comprising:

• a cover that is plate-shaped, and closes an opening portion formed in a part of an upper surface of a device body;
• a shaft body, one end of the shaft body being perpendicularly fixed to the cover, and at least a part of the shaft body at the other end of the shaft body being inserted into the device body;
• a turning mechanism that rotatably supports the shaft body inside the device body to allow turning of the cover around the shaft body in a plane parallel with the upper surface of the device body,
• a protrusion portion fixed to the shaft body on a side surface of the shaft body, and
• an up-down guide that guides the protrusion portion,
• wherein
• the turning mechanism includes a limitation portion that limits a rotation angle of the shaft body to a fixed range such that the cover turns between a cover closing position where the cover closes the opening portion, and a cover opening position where the cover opens the opening portion,
• the limitation portion limits a turnable angle of the protrusion portion turning in accordance with rotation of the shaft body to the fixed range, and
• the up-down guide includes a slope portion that guides the protrusion portion such that the protrusion portion gradually raises the shaft body when the cover turns from the cover closing position to the cover opening position.

A rotation cover opening/closing mechanism comprising:

• a cover that is plate-shaped, and closes an opening portion formed in a part of an upper surface of a device body;
• a shaft body, one end of the shaft body being perpendicularly fixed to the cover, and at least a part of the shaft body at the other end of the shaft body being inserted into the device body;
• a turning mechanism that rotatably supports the shaft body inside the device body to allow turning of the cover around the shaft body in a plane parallel with the upper surface of the device body, wherein the turning mechanism includes a limitation portion that limits a rotation angle of the shaft body to a fixed range such that the cover turns between a cover closing position where the cover closes the opening portion, and a cover opening position where the cover opens the opening portion,
• a turning portion that turns in linkage with rotation of the shaft body;
• and
• a rotational urging spring that is fixed to the device body and the turning portion, and gives rotational force to the shaft body to cause a shift of the cover to the cover closing position when the cover is located closer to the cover closing position than to an intermediate range defined between the cover closing position and the cover opening position, and to cause a shift of the cover to the cover opening position when the cover is located closer to the cover opening position than to the intermediate range.