Gate assembly and casing with gate assembly

A casing with a gate assembly, comprising:

• a casing, provided with an opening and two engagement grooves located on two opposite sides of the opening;
• and
• a gate assembly, arranged on the casing and correspondingly covering or exposing the opening, wherein the gate assembly comprises:
• a base member;
• a door cover member, arranged on the base member and comprising:
• a body, provided with a through slot and two protruding posts;
• a movable portion, arranged on the body and movable relative to the body along a first axis, wherein the movable portion is provided with two limiting posts and an accommodating portion;
• and
• two gate portions, movably arranged on the body and the movable portion, wherein each of the gate portions is provided with a limiting hole formed in an inclined direction and a positioning hole formed along a second axis orthogonal to the first axis, each of the limiting posts extends through the limiting hole, each of the protruding posts extends through the positioning hole, and when the movable portion moves along the first axis, the limiting post moves from one end of the limiting hole to an other end, and the protruding post moves from one end of the positioning hole to an other end to drive and limit movement of each of the gate portions along the second axis;
• and
• an operating member, extending through the through slot and comprising a holding portion and a latch portion, wherein the holding portion extends to one side of the door cover member, and the latch portion is connected to the movable portion and located on an other side of the door cover member, wherein
• the operating member is configured to drive the movable portion to reciprocate along the first axis and reciprocate relative to the movable portion along the second axis, so that a part of the latch portion is accommodated in or exposed from the accommodating portion;
• and
• when the gate assembly covers the opening, a part of each of the gate portions selectively leaves or is accommodated in each of the engagement grooves along the second axis.