Connection structure

A connection structure configured to electrically connect between a first connection object and a second connection object, wherein:

• the connection structure comprises a first contact, a second contact, a relay contact, a first receiving portion and a second receiving portion;
• the first contact is configured to be connected to the first connection object;
• the second contact is configured to be connected to the second connection object;
• the first contact is formed with a first female thread;
• the second contact is formed with a second female thread whose handedness is opposite to a handedness of the first female thread;
• the relay contact has a shaft portion extending in a predetermined direction;
• the shaft portion is formed with a first male thread and a second male thread;
• the first male thread corresponds to the first female thread;
• the second male thread corresponds to the second female thread;
• a handedness of the second male thread is opposite to a handedness of the first male thread;
• when the first contact receives a force in a first orientation along the predetermined direction by a mating of the first male thread of the relay contact and the first female thread of the first contact upon screwing of the relay contact, the first receiving portion receives the first contact to regulate a movement of the first contact in the first orientation;
• when the second contact receives a force in a second orientation along the predetermined direction by a mating of the second male thread of the relay contact and the second female thread of the second contact upon the screwing of the relay contact, the second receiving portion receives the second contact to regulate a movement of the second contact in the second orientation;
• the second orientation is opposite to the first orientation;
• and
• the regulation of the movement of the first contact by the first receiving portion and the regulation of the movement of the second contact by the second receiving portion cause that the first male thread of the relay contact is brought into contact with the first female thread of the first contact at multiple locations while the second male thread of the relay contact is brought into contact with the second female thread of the second contact at multiple locations.