doorhinge

A door hinge is a mechanical device, usually metal, used to attach a door to its frame, allowing it to pivot open or closed. It typically consists of two leaves, one attached to the door and the other to the frame, connected by a pin that runs through aligned knuckles. This pin allows for rotational movement. Different types of hinges exist, designed for various door weights, materials, and operational requirements.

The most common type is the butt hinge, characterized by its flat leaves. Strap hinges, with longer, decorative leaves, are often used for gates or heavier doors. Continuous hinges, also known as piano hinges, extend along the entire length of the door, providing strong support. Specialized hinges include rise and fall hinges, which lift the door slightly as it opens, and pivot hinges, which rotate on a point at the top and bottom of the door.

Door hinges are crucial for the functionality and usability of doors. They are essential components in buildings, vehicles, and furniture, enabling access and closure. The material, size, and number of hinges used depend on the weight and type of door. Proper installation and maintenance of door hinges ensure smooth operation and longevity.