Patent ID: 8191937
Filing Date: 2012-06-05
Classification: E05B,E05C,Y10T

Abstract:
1. An automatic hidden latch structure provided in a door of a double-door device, wherein the door has a close side, comprising: a base secured in position in the door, proximate to the close side of the door, and having a positioning plate for positioning, a block portion and a receiving portion beside the positioning plate; a transmission mechanism disposed in the receiving portion and provided with a lock tongue received in and protruding from the receiving portion, a transmission member abutting against the lock tongue, a rotating member driven by the transmission member, and an engaging member fastenably engaging with the rotating member and protruding from the receiving portion, wherein the transmission member has a sloped transmission portion, the rotating member has an engaging portion, a rolling member and a rotating shaft, and the engaging member has a hook portion for engaging with the engaging portion of the rotating member, allowing the transmission portion to lean against the rolling member of the rotating member and the rotating member to swing around the rotating shaft; and a latch mechanism disposed in the block portion, mounted with the engaging member, and provided with a first elastic element and a check ring insertably engaging with the engaging member, a joining member mounted on a bottom of the engaging member, and a latch post and a bump mounted on the joining member for latching the door; wherein, with the door being closed, the lock tongue is pushed against by the close side of the door such that the transmission member is moved so as to drive the rotating member to rotate, and thus the rotating member pushes the engaging member, thereby pushing the latch post and the bump away from the engaging member; and wherein, with the door being open, the lock tongue is not pushed against by the close side of the door, allowing the first elastic element to push backward against the engaging member and thus the rotating member to push the transmission member and the lock tongue, thereby causing the lock tongue to protrude outward and the latch post and bump to retract inward.