Joint mechanism and child safety seat

A joint structure for detachably joining a first object to a second object, comprising:

• a fixing part connected to the first object, the fixing part having a cylindrical fixing part side wall, and the fixing part side wall having an open end and a receiving end provided opposite to each other;
• an inserting part connected to said second object, the inserting part having a cylindrical inserting part side wall, and the inserting part being inserted and sleeved into the fixing part side wall along an insertion direction through the open end, such that the second object is jointed to the first object;
• a closing member provided inside the fixing part side wall, positioned between the receiving end of the fixing part and the inserting part, and being movable between the open end and the receiving end;
• the closing member having a closing plate adjacent to the open end, and the closing plate being shaped corresponding to a cross-sectional shape of the fixing part side wall at the open end;
• a first elastic member provided between the closing member and the receiving end, for exerting a force that bias the closing member toward the open end, such that the closing member elastically abuts against the inserting part, wherein when the inserting part is not inserted into the fixing part, the closing member is biased to the open end by the first elastic member;
• and when the inserting part is inserted into the fixing part, the closing member is pushed to the receiving end by the inserting part and leaves the open end;
• and
• a release button provided on the inserting part side wall and partially inserted in the inserting part, wherein the release button is slidable between a locked position away from the inserting part and a release position close to the inserting part in a direction perpendicular to the insertion direction of the inserting part, so as to selectively lock the inserting part to the fixing part.

A child safety seat, comprising:

• a seat body;
• a canopy configured to join to an upper part of the seat body;
• and
• two joint structures respectively provided on both sides of the seat body for detachably joining a first object to a second object, the first object being the seat body and the second object being the canopy,
• wherein
• each of the two joint structures comprises:
• a fixing part connected to the first object, the fixing part having a cylindrical fixing part side wall, and the fixing part side wall having an open end and a receiving end provided opposite to each other, the receiving end of the fixing part being embedded into the seat body from a corresponding side surface of the seat body, and the open end of the fixing part being exposed out of a corresponding side surface of the seat body;
• an inserting part connected to said second object, the inserting part having a cylindrical inserting part side wall, and the inserting part being inserted and sleeved into the fixing part side wall along an insertion direction through the open end, such that the second object is jointed to the first object;
• a closing member provided inside the fixing part side wall, positioned between the receiving end of the fixing part and the inserting part, and being movable between the open end and the receiving end;
• the closing member having a closing plate adjacent to the open end, and the closing plate being shaped corresponding to a cross-sectional shape of the fixing part side wall at the open end;
• and
• a first elastic member provided between the closing member and the receiving end, for exerting a force that bias the closing member toward the open end, such that the closing member elastically abuts against the inserting part, wherein when the inserting part is not inserted into the fixing part, the closing member is biased to the open end by the first elastic member;
• and when the inserting part is inserted into the fixing part, the closing member is pushed to the receiving end by the inserting part and leaves the open end;
• the canopy comprises a first canopy rod and a second canopy rod that are substantially U-shaped, each of the two joint structures comprises a first canopy rod fixing member and a second canopy rod fixing member, wherein the first canopy rod fixing member is fixed on the inserting part, and the second canopy rod fixing member is pivotally connected to the first canopy rod fixing member;
• and
• two ends of the first canopy rod are fixedly connected to the corresponding first canopy rod fixing members of the two joint structures, respectively, and two ends of the second canopy rod are fixedly connected to the corresponding second canopy rod fixing members of the two joint structures, respectively, so that the second canopy rod is rotatable about an axis parallel to the insertion direction of the inserting part with respect to the first canopy rod.