Snap fastening unit

A snap fastening unit for being fastened to one or more thin walls with through holes, comprising a housing and at least one snap block, the housing having a fastening support wall and a head portion extending away from the fastening support wall, the head portion having a guide channel;

• the snap block being restricted to slide directionally on the guide channel of the head portion and being interchangeable between a fastening position and a releasing position on the head portion;
• in the fastening position, a clamping head of the snap block protruding from the head portion and engaging with the fastening support wall to form a fastened state allowing the snap block to be fastened to the one or more thin walls;
• in the releasing position, the clamping head of the snap block retracting into the head portion to form a detachable state allowing the head portion of the snap fastening unit to freely enter and exit the through hole in the thin wall;
• the snap block comprising an elastic element providing an elastic loading force that drives the snap block to slide to the fastening position and maintains the snap block in the fastening position,
• wherein the snap fastening unit further comprises an automatic locking device;
• the automatic locking device comprises a first locking member arranged on the snap block and moveable along with the snap block, and a second locking member arranged on the head portion;
• when the snap block slides to the releasing position, the first locking member and the second locking member automatically lock together to lock the snap block on the head portion, and meanwhile the elastic element completes energy storage;
• the automatic locking device further comprises a triggering component which drives the first locking member to unlock from the second locking member to release the snap block from the releasing position, and the snap block released at the releasing position is driven by the energy storage of the elastic element to return to the fastening position.