Electric slide rail systems and methods

A rail for a sliding assembly including a screw member, the rail comprising:

• a sidewall extending along a rail axis and having a front end and a rear end;
• a plurality of engagement slots formed in the sidewall between the front end and the rear end, each of the plurality of engagement slots having a clearance portion, an upper engagement portion in communication with an upper end of the clearance portion, and a lower engagement portion in communication with a lower end of the clearance portion;
• wherein each of the plurality of engagement slots extends with respect to a second axis perpendicular to the rail axis;
• wherein the upper engagement portion and the lower engagement portion are configured to engage the screw member;
• and
• wherein the upper engagement portion has a leading contact edge oriented at an angle equal to or greater than a thread angle of the screw member.

An electric slide rail,

• a rail having a groove-shaped cross section and extending along the first direction;
• a slider received in and slidably engaged with the rail;
• a screw assembly including a screw member rotatably supported by the slider about the first direction;
• an electric motor supported by the slider and rotating the screw member;
• a threaded engagement portion extending in the first direction and formed on the rail so as to engage with the threaded member;
• wherein the rail has a pair of side walls facing each other,
• the screw engagement portion has a plurality of engagement holes formed in each of the pair of side walls and arranged in the first direction,
• each of the engagement holes extends obliquely with respect to a second direction orthogonal to the first direction, and includes a first portion disposed at the center in the longitudinal direction, and a pair of second portions disposed on both sides of the first portion, and a width of each of the second portions in the first direction is smaller than a width of the first portion in the first direction, such that the screw member does not contact an edge of the engagement hole in the first portion, but contacts the edge of the engagement hole in at least one of the second portions.