Core Function: Why the Rising Design?

The sole purpose of Rising Butt Hinge is to elevate the door panel away from obstacles as it swings open. The most common obstacles are thick carpets or mats, and they also help the door panel clear uneven surfaces, high thresholds, and even ventilation grilles.

·Opening: The hinge mechanism forces the door panel to lift vertically by approximately 1/2 inch (12-13 mm) during the opening process.

·Closing: The door panel gently lowers back to its original sealed position.

This design prevents the bottom edge of the door panel from scraping, catching, or wearing down carpets.

Working Principle: The Ingenuity Lies in the Pin

The secret lies in the design of the hinge pin and hinge joint:

1. Helical Pin Shaft: The pin shaft is not perfectly straight; a portion of its length features a slight, progressive helical shape (like an extremely shallow thread).

2. Interlocking Mechanism: The inner surface of one side of the hinge socket contains a helical groove that matches the helical pin shaft.

3. Lifting Action: When opening the door, the spiral pin rotates within the groove. Since both ends of the pin are fixed, this rotation forces the entire door panel to move upward along the spiral path of the pin. The reverse action occurs when closing the door.

Analogy: The principle resembles that of a corkscrew—rotation generates vertical displacement.

Key Features and Identification Methods

· Appearance: Resembles heavy-duty double-hinges. Its lifting function is built-in.

· Opening Direction (Left/Right): Extremely important! Lift-up double-hinges are directional—when the door opens away from you and the hinge is on the left side, select a left-opening hinge; conversely, select a right-opening hinge. Incorrect installation direction will cause door sagging and jamming during opening.

· Non-removable Pins: For safety and functionality, pins are typically fixed-design to resist impact dislodgement or removal, preventing accidental door detachment.

· Heavy-Duty Springs: Most models feature heavy-duty springs to assist closing/lowering actions, ensuring a tight Door Seal.

Common Types and Application Scenarios

There are primarily two designs, typically used in tandem:

 1. Lift-type hinge: The basic type described above—providing lifting functionality only.

 2. Lift-spring hinge: Integrates a spring mechanism with the spiral pin, combining lifting functionality with automatic closing. This design is widely used in fire doors for commercial or residential buildings, ensuring door panels can clear carpets and close automatically.

Primary Application Scenarios:

·Door panels requiring clearance over thick pile carpets

·Fire doors needing reliable closure across varying floor coverings

·Exterior doors equipped with high weatherstripping or thresholds

·Renovation projects involving changes in floor level

Installation and Adjustment Precautions

Installing upward-opening double hinges is similar to standard double hinges but requires higher precision:

 1. Direction selection is critical: Always confirm the door panel's opening direction before purchase. Hinges with incorrect orientation will not function properly.

 2. Vertical alignment must be precise: Hinges must be perfectly vertically aligned. Any tilt will obstruct upward movement, making the door difficult to open.

 3. Clearance Verification: Ensure sufficient headroom above the door to prevent collision with the top door frame when the door lifts.

 4. Professional Installation Recommended: Due to the need for precise alignment and the drilling/chasing required for installing these heavy-duty hinges, installation should ideally be performed by an experienced carpenter or professional door installer.

Summary

In short, the Rising Butt Hinge is a problem-solving hardware solution. When standard hinges cause doors to scrape the floor, it becomes your ideal choice. Its ingenious spiral pin design adds crucial lift to door swing, ensuring smooth operation even on uneven surfaces.