Push button device, keyboard device, and electronic apparatus

A keyboard device comprising a plurality of push button devices, wherein at least one push button device includes:

• a base part;
• a guide mechanism disposed on an upper surface of the base part;
• and
• a push button that is guided by the guide mechanism to be vertically movable, wherein
• the guide mechanism includes:
• an outer frame member having a first end rotatably supported on the base part and a second end rotatably supported on the push button, and
• an inner member disposed inside the outer frame member and diagonally braced to the outer frame member, the inner member having a first end rotatably supported on the push button and a second end rotatably supported on the base part,
• the outer frame member has a pair of inner surfaces opposed to each other with an opening therebetween, each of the inner surfaces having a first engagement part that consists of one of a bearing hole and a rotation shaft,
• the inner member has a pair of outer surfaces opposed to the pair of inner surfaces of the outer frame member, each of the outer surfaces has a second engagement part that consists of an other one of the bearing hole and the rotation shaft, the second engagement part being rotatably engaged with the first engagement part,
• the rotation shaft has an outer peripheral surface including a tapered portion whose outer diameter gradually decreases in an insertion direction of the bearing hole,
• the bearing hole has only one inner diameter along an entire length, in the insertion direction, of the bearing hole, and
• the tapered portion has a proximal outer diameter larger than the inner diameter of an opening edge of the bearing hole, has a distal outer diameter smaller than the inner diameter of the opening edge of the bearing hole, and has an outer peripheral surface in contact with the opening edge of the bearing hole.

An electronic apparatus comprising:

• a chassis equipped with a keyboard device having:
• a plurality of push button devices, wherein at least one push button device includes:
• a base part;
• a guide mechanism disposed on an upper surface of the base part;
• and
• a push button that is guided by the guide mechanism to be vertically movable, wherein
• the guide mechanism includes:
• an outer frame member having a first end rotatably supported on the base part and a second end rotatably supported on the push button, and
• an inner member disposed inside the outer frame member and diagonally braced to the outer frame member, the inner member having a first end rotatably supported on the push button and a second end rotatably supported on the base part,
• the outer frame member has a pair of inner surfaces opposed to each other with an opening therebetween, each of the inner surfaces having a first engagement part that consists of one of a bearing hole and a rotation shaft,
• the inner member has a pair of outer surfaces opposed to the pair of inner surfaces of the outer frame member, each of the outer surfaces has a second engagement part that consists of an other one of the bearing hole and the rotation shaft, the second engagement part being rotatably engaged with the first engagement part, and
• the rotation shaft has an outer peripheral surface including a tapered portion whose outer diameter gradually decreases in an insertion direction of the bearing hole,
• the bearing hole has only one inner diameter along an entire length, in the insertion direction, of the bearing hole, and
• the tapered portion has a proximal outer diameter larger than the inner diameter of an opening edge of the bearing hole, has a distal outer diameter smaller than the inner diameter of the opening edge of the bearing hole, and has an outer peripheral surface in contact with the opening edge of the bearing hole;
• and
• a display chassis including a display that displays in accordance with an input operation to at least one of the push button devices of the keyboard device, the display chassis being rotatably connected to the chassis.