Spiral safety hinge for self-opening door

Abstract

The invention discloses a spiral safety hinge for a self-opening door. The spiral safety hinge comprises a first connecting plate and a second connecting plate, wherein a first screw rod is arranged on the first connecting plate; a second screw rod is arranged on the second connecting plate; and the first screw rod is arranged on the inner side of the second screw rod and is connected with the second screw rod in a sliding manner. The spiral safety hinge for the self-opening door has the advantages that the structure is simple, the production cost is relatively low, the opening and closing angle is relatively large, the contact area between the two screw rods is relatively large, the bearing pressure is relatively low, the spiral safety hinge is not liable to abrade, and the service life is relatively long.

Description

technical field [0001] The invention relates to a self-opening door spiral safety hinge. Background technique [0002] Chinese utility model patent CN200320116501.3 discloses a self-closing door spiral hinge, which includes a hinge with a shaft sleeve disposed thereon, and bolts disposed in the shaft sleeve. It is characterized in that the working end surface on the hinge shaft sleeve is an annular positive spiral working surface or an annular special-shaped working surface, and there is a gap of half a pitch between the non-working surfaces of the shaft sleeve. When the door is opened, the spiral working surfaces on the two matching hinge bushes rotate to generate relative displacement. Once the external force is lost, the door will automatically slide down under the action of its own gravity and the door will be automatically closed. However, the processing cost of this spiral working surface is relatively high, resulting in high production cost of this self-closing door ...

AI Technical Summary

Problems solved by technology

However, the processing cost of this spiral working surface is relatively high, resulting in high production cost of this self-closing door spiral hinge; in addition, the relative rotation angle between the two hinges of this self-closing door spiral hinge is small, so it cannot be applied In the normally open doors that can be opened both outwards and inwards in large public places, for example, the gates of buildings can usually be opened to close to 180 degrees and close to 180 degrees inwards, and the rotation angle is relatively large

The area of ​​the spiral working surface is small, but the pressure it bears is relatively large, so it is easy to be worn, resulting in a short service life of the self-closing spiral hinge; The shaft sleeves slide against each other, so they are easily damaged by criminals

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