Door opening and closing mechanism

A door opening and closing mechanism in which a door to be attached to a body having an opening is separated from, and made in contact with a periphery of the opening so that the opening is opened and closed, and having a force-boosting mechanism, the force-boosting mechanism, comprising:

• a handle supported on the door by a shaft and having an operation portion at which the handle is held when rotated;
• a connected portion having a rotation center on a same side of the shaft as the operation portion, connected to the handle at a position between the rotation center and the shaft, and receiving, when the handle is rotated, an operation force on the handle after boosting;
• and
• a contact portion arranged on an opposite side of the rotation center of the connecting portion from the connecting portion, rotating together with the connecting portion to receive a rotation force thereof, and arranged to face the periphery of the opening,
• wherein, upon rotating the handle, the contact portion is pressed against the body so that the door is separated from the periphery of the opening with a predetermined distance.

A door opening and closing mechanism in which a door to be attached to a body having an opening is separated from, and made in contact with a periphery of the opening so that the opening is opened and closed, comprising:

• a handle that is shaft-supported on the door and allowed to pivot, the handle having an operation portion;
• a crank shaft made of metal, which has a first shaft portion that is placed on a same side as the operation portion with respect to a rotation axis of the handle, and fitted to the handle so as to freely pivot thereon and a second shaft portion that is formed in parallel with the first shaft portion, and supported on the door;
• a contact portion that is placed on the second shaft portion on a side opposite to the first shaft portion in a manner so as to extend perpendicularly from the second shaft portion, and aligned face to face with the periphery of the opening;
• and
• a first stopper with which the first shaft portion that pivots centered on the second shaft portion is made in contact to regulate the pivotal movement of the handle,
• wherein, when the operation portion is pulled, the contact portion is allowed to press the body so that the door is separated from the periphery of the opening with a predetermined distance.

A door opening and closing mechanism in which a door to be attached to a body having an opening is separated from, and made in contact with a periphery of the opening so that the opening is opened and closed, comprising:

• a handle that is shaft-supported on the door and allowed to pivot, the handle having an operation portion;
• a crank shaft which has a first shaft portion that is placed on a same side as the operation portion with respect to a rotation axis of the handle, and fitted to the handle so as to freely pivot thereon, a second shaft portion that is formed in parallel with the first shaft portion through a connecting portion formed by bending an end portion of the first shaft portion, and supported on the door, and a bent portion that is formed by bending a tip of the second shaft portion in a perpendicular direction toward a side opposite to the first shaft portion;
• a contact portion that is attached to the bent portion to be integrally formed with the second shaft portion, and placed face to face with the periphery of the opening;
• a shaft cover that is placed on the door with the crank shaft being inserted therein, and has first and second spaces in which the first and second shaft portions are respectively placed with a width that allows at least one of the connecting portion and the bent portion to be inserted therein, with a fitting section to which the second shaft portion is fitted being formed at an end of the second space by opening the end in a width direction thereof;
• and
• a supporting member having a holding portion that is fitted to the second space to be held therein and a shaft supporting portion that supports an opened side of the second shaft portion fitted to the fitting section,
• wherein, when the operation portion is pulled, the contact portion presses the body so that the door is separated from the periphery of the opening with a predetermined distance.