2399results about "Construction fastening devices" patented technology

A lock capable of automatically locking a door after closing includes a latch, an anti-theft latch, and a stop-latch. When the door is in an open position, the stop-latch is in an extended position to prevent the anti-theft latch from moving to an anti-theft position. When the door pivots to a closed position, the stop-latch moves to a retracted position, and the anti-theft latch moves to the anti-theft position. When the latch is moved to an unlatching position through normal operation, the anti-theft latch moves to a non-anti-theft position. Thus, the anti-theft latch will be in the anti-theft position when the door is in the closed position, and the anti-theft latch will move to the non-anti-theft position when the door is opened through normal operation.

There is provided an unlocking device, including: a rotating member; a housing; an operating member; and a biasing member. The rotating member includes a pressed portion, and a retaining portion. The housing includes an accommodating portion, an engaging portion that is engaged with the retaining portion, and an opening. The operating member includes a pressing portion, and is slidable in a direction substantially parallel to a rotation plane of the rotating member. The retaining portion and the engaging portion are located within a thickness range of the operating member when viewed in a sliding direction of the operating member.

The utility model relates to a steel double-leaf flood-proof door which comprises a door frame, door leaves, an upper bolt clamping mechanism and a lower bolt clamping mechanism, the upper bolt clamping mechanism and the lower bolt clamping mechanism are arranged on the door leaves, a lower doorsill of the door frame is buried in a terrace, and the upper surface of the door frame is flush with the terrace; the upper part of the lower doorsill is provided with a plurality of openings for inserting bolts; the upper and lower bolt clamping mechanism comprises a bolt, a movable sinking water retaining block which moves up and down synchronously with the bolt is fixedly arranged on the bolt, the movable sinking water retaining block is in an L shape, the bottom face of the movable sinking water retaining block can cover the upper surface of the lower doorsill, and a rubber sealing piece is arranged on the side face of the movable sinking water retaining block to be attached to the door leaf. The lower doorsill is pre-buried in the terrace and kept on the terrace, when the plug pin is downwards inserted into the lower doorsill, the L-shaped movable sinking water retaining block moves downwards together, the bottom face of the L-shaped movable sinking water retaining block presses the lower doorsill, meanwhile, the side face of the L-shaped movable sinking water retaining block blocks a door crack in the bottom of the door leaf, and the good sealing and flood preventing functions are achieved.