Rail connecting structure

A rail connecting structure that connects rails to be mounted on rail mounting members, the rail connecting structure comprising:

• a base block that is placed at a connecting portion of one rail and the other rail and is separate from the rail mounting members, wherein
• the base block is fastened to the one rail and the other rail with fastening members that are passed through mounting holes of the one rail and the other rail,
• the base block is not fixed to the rail mounting members and is movable relative to the rail mounting members,
• side surfaces of the rails are pressed against a reference surface of the base block by use of cap screws that are threadedly engaged with the base block,
• the base block is formed with female threads that are threadedly engaged with the fastening members, and
• the base block is formed with female thread portions that are threadedly engaged with the cap screws that are different from the fastening members.

A rail connecting structure that connects rails to be mounted on rail mounting members, the rail connecting structure comprising:

• a base block that is placed at a connecting portion of one rail and the other rail and is separate from the rail mounting members, wherein
• the base block is fastened to the one rail and the other rail with fastening members that are passed through mounting holes of the one rail and the other rail, and
• the base block is not fixed to the rail mounting members and is movable relative to the rail mounting members,
• side surfaces of the rails are pressed against a reference surface of the base block by use of cap screws that are threadedly engaged with the base block and rail retainers placed on the side surfaces of the rails opposite to the reference surface.