Hinge capable of being set in normally opened state or in normally closed state

Abstract

The invention discloses a hinge capable of being set in a normally opened state or in a normally closed state. The hinge comprises a double-shaft-sleeve hinge piece (1), a single-shaft-sleeve hinge piece (2) and a pin shaft (3). An upper torsion spring (7) is arranged in an upper shaft sleeve (4) of the double-shaft-sleeve hinge piece. One end of the upper torsion spring is welded to the inner wall of the upper shaft sleeve. The other end of the upper torsion spring extends out from a straight slot (9) of the upper shaft sleeve. A lower torsion spring (8) is arranged in a lower shaft sleeve (5) of the double-shaft-sleeve hinge piece. One end of the lower torsion spring is welded to the inner wall of the lower shaft sleeve. The other end of the lower torsion spring extends out from an L-shaped slot (10) of the lower shaft sleeve. The single-shaft-sleeve hinge piece is provided with an upper clamping groove (11) and a lower clamping groove (12) corresponding to upper and lower straight slots. According to the hinge provided by the invention, an improvement is made on a common damping hinge; the new functions are added to the hinge; and switching of a common damping state, the normally opened state and the normally closed state maintained by the hinge can be realized through simple arrangement. The hinge is simple in structure, easy to implement and reliable in use and has no influence on existing doors and windows after installation.

Description

technical field [0001] The invention relates to a hinge which can be set in a normally open or normally closed state, and belongs to the technical field of door and window hardware. Background technique [0002] The hinges used for existing doors and windows are common hinges or common hinges with a damping function. However, in use, the doors and windows are sometimes required to be opened or closed most of the time. The prior art is usually to fix a rubber band on the door, and when people go in and out, the door is automatically closed under the action of the rubber band. The prior art affects the appearance, and the rubber band is easy to break after being used for a period of time. There are certain deficiencies. Contents of the invention [0003] The object of the present invention is to provide a hinge that can be set to a normally open or normally closed state, so that the switch between the normally open, normally closed and normal functions of doors and window...

AI Technical Summary

Problems solved by technology

The existing technology affects the appearance, and the rubber band is easy to break after a period of use

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