Linear motion unit

A linear motion unit comprising:

• a linear motion mechanism including a track member and a moving member, the moving member being linearly movable along longitudinal directions of the track member;
• and
• a housing that houses the linear motion mechanism and includes a fastener extending in the longitudinal directions,
• the track member having a first rolling surface extending in the longitudinal directions,
• the moving member having a second rolling surface, the second rolling surface being opposed to the first rolling surface and defining a rolling element raceway between the first rolling surface and the second rolling surface,
• the linear motion mechanism further including a plurality of rolling elements that circulate in a rolling element circulation path including the rolling element raceway with linear movement of the moving member along the longitudinal directions of the track member,
• the fastener including
• a first element extending in the longitudinal directions,
• a second element that extends along the first element in the longitudinal directions and is meshable with the first element,
• a first slider that is attached to the first element and the second element, and
• a second slider that is attached to the first element and the second element and located away from the first slider in the longitudinal directions,
• the first slider and the second slider being configured to cause the first element and the second element to be separated from each other when the first slider and the second slider move away from each other, and to cause the first element and the second element to mesh with each other when the first slider and the second slider move toward each other, and
• the first slider and the second slider being fixable to the moving member that is housed in the housing.