Patent ID: 7958602

Claim:
A hinge mechanism comprising: a movement limiting opening and closing shaft member that is attached to one housing and at an end portion of which an opening and closing limiting protrusion section is provided; a movement limiting rotation shaft member that is attached to another housing and at an end portion of which a rotation limiting protrusion section is provided; a hinge housing that is provided with an opening and closing shaft holding section that rotatably supports the movement limiting opening and closing shaft member, and a rotation shaft holding section that is arranged perpendicular to the opening and closing shaft holding section, rotatably supports the movement limiting rotation shaft member with being perpendicular to the movement limiting opening and closing shaft member, wherein said rotation shaft holding section allows the rotation limiting protrusion section and the opening and closing limiting protrusion section to accessibly contact each other; an opening and closing limiting outer peripheral surface portion having a circular arc shape that is formed at the opening and closing limiting protrusion section; a restraining end surface formed on the opening and closing limiting outer peripheral surface portion, the restraining end surface being a planar surface; a rotation limiting outer peripheral surface portion having a circular arc shape that is formed at the rotation limiting protrusion section; and a restraining end section which is a surface formed in an escape recess section located on the rotation limiting outer peripheral surface portion, the escape recess section being configured such that the opening and closing limiting outer peripheral surface portion can be entered in the escape recess section, wherein, in a state in which the restraining end surface and the restraining end section are opposed, the movement limiting opening and closing shaft member and the movement limiting rotation shaft member are rotatable, and a spacing between the opening and closing shaft holding section and the rotation shaft holding section is set such that, in a state in which the rotation limiting outer peripheral surface portion opposes the restraining end surface, the restraining end surface touches against the rotation limiting outer peripheral surface portion and rotation of the movement limiting opening and closing shaft member is restrained, and in a state in which the opening and closing limiting outer peripheral surface portion opposes the restraining end section, the restraining end section touches against the opening and closing limiting outer peripheral surface portion and rotation of the movement limiting rotation shaft member is restrained.