Protection device for entrance guard

• Main Author: ZHANG JIWU
• Format: Patent
• Language: Chinese; English
• Published: 17.07.2018
• Subjects: DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; FIXED CONSTRUCTIONS; FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES,FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS,BLINDS, GATES; LADDERS

The invention relates to the technical field of certified property and discloses a protection device for an entrance guard. The protection device comprises a door frame. Screws are fixedly mounted onthe positions, located on the left portion and the right portion of the door frame, of the front face of the door frame correspondingly; first hinges are fixedly mounted at the ends, close to the doorframe, of the screws; second rotating shafts are fixedly mounted on the sides, away from the door frame, of the first hinges; and second hinges are fixedly mounted at the ends, away from the first hinges, of the second rotating shafts. According to the protection device for the entrance guard, the depth of a sliding groove is gradually increased from the middle to the two ends, and the depth of each groove is larger than the depth of the sliding groove so that under the situation that a door is not well closed, clamping columns can be clamped inside the grooves under the inertia effect, and accordingly the door can be