The top and bottom pivots (also known as “up and down pivots”) are a type of hardware component used to control the rotation and positioning of a door. The core structure consists of the “top pivot” (installed on the top of the door frame or the door lintel) and the “bottom pivot” (installed on the ground or the bottom of the door). It achieves the opening and closing of the door by supporting at two points. Its functions revolve around “stable support, flexible rotation, and adaptation to special door types”, and it is widely used in scenarios such as hingeless doors, heavy-duty doors, and minimalist-style doors. The specific functions and features can be broken down into the following dimensions:
Core Function
Two-point support, replacing traditional hinges to achieve door rotation
The essence of the top and bottom pivots is “the core hub for door rotation”. Through the symmetrical pivot structure on top and bottom, it replaces the function of traditional side hinges (such as hinges), solving the pain points of traditional hinges that are difficult to adapt to certain scenarios:
- Stabilize the door and distribute the load pressure: Traditional hinges need to be installed 2-3 times on the side of the door body, concentrating the load on the side, and over time, they can cause the door to tilt or the hinges to loosen (especially for heavy-duty doors); while the top and bottom pivots are supported vertically by two points (the bottom pivot mostly bears the main load), and even for heavy-duty doors weighing over 100kg (such as solid wood doors, copper doors, and glass doors), they can remain stable for a long time, avoiding door sagging or rotation jamming.
- Enable 360° or bidirectional rotation (as per design requirements): Conventional top and bottom pivots can support the door’s bidirectional 180° rotation (such as for public areas with bidirectional door opening), meeting the need for people to pass through from both sides, replacing the bidirectional door opening function of the floor spring;
Special customized models (such as rotating door top and bottom pivots) can achieve 360° continuous rotation, suitable for rotating doors, display areas with irregular doors, etc., providing a stable rotation axis for the door.
| Category name | Minimum order quantity | Dollar ladder price | unit | Grouping | Core keywords | Country of origin | Outer packaging size | Gross weight KG | Shipped quantity | Estimated delivery time | Packaging method | Sample part |
| HAFELE wooden door heaven and earth axis Rotating hinge | 2 | 50-70 | set | Accessories | Heaven and earth axis | China | 20*20*10cm， | 2.4 | 999 | 10 | cartons | Not supported |
Core Function: Adapt to special door types + optimize space and aesthetics
The functional advantages of the top and bottom pivots lie in “adaptability” and “aesthetics”, especially for door types and design requirements that traditional hinges cannot cover:
Adapt to no-frame / minimalist door types, breaking installation limitations
No-frame glass doors / metal doors
Traditional hinges rely on the connection between the door body and the door frame, while no-frame glass doors (such as commercial exhibition halls, high-end residential glass partitions) have no side force points. The top and bottom pivots are installed “fixed to the ceiling / door lintel at the top and to the ground at the bottom”, without contacting the side of the door body, achieving support without exposing the side hinges, perfectly solving the rotation requirements of no-frame doors;
Invisible doors / concealed doors
Invisible doors pursue “integration of door and wall”, traditional hinge-side installation would expose the hardware traces, damaging the invisible effect; the hidden installation of the top and bottom pivots (only the bottom pivot may expose a small amount of components, which can be covered by ground decoration), allows the door body to seamlessly connect with the wall, achieving “invisible” design.
Optimize space utilization, reduce collision hazards
Save side space
When traditional hinge doors are opened, the side of the door body protrudes outward (requiring a hinge rotation space), which is prone to collision with people or objects in narrow corridors, elevator lobbies, etc.; the top and bottom pivots’ door opening only revolves around the up and down axes, the side of the door body does not require additional space, especially suitable for small-sized, compact public areas, improving passage efficiency;
Avoid hinge scraping
The metal components of traditional hinges are exposed, prone to scraping clothes, bags, or being touched and injured by children; the top and bottom pivots have no exposed side hardware, providing higher safety, especially suitable for families, kindergartens, etc.
- Adapt to heavy-duty doors and special material door bodies Heavy-duty door compatibility: For heavy doors weighing 50-200kg (such as villa copper doors, hotel solid wood doors, industrial workshop iron doors), the high-load design of the Heavenly Earth Axis (with bottom rotating shafts mostly made of high-strength materials like stainless steel and brass) can stably support them, and has low rotational resistance, making door opening and closing more convenient, avoiding door deformation caused by insufficient load of traditional hinges;
- Special-shaped door compatibility: For curved doors and special-shaped doors (such as triangular doors, irregularly shaped doors), traditional hinges have difficulty finding symmetrical installation points. The Heavenly Earth Axis can adjust the positions of the upper and lower rotating shafts to adapt to the special structure of the door body, ensuring that the rotation axis center is consistent with the center of gravity of the door body, avoiding door shaking.
Additional functions: Enhancing user experience and durability
Wear-Resistant, Suitable for Complex Scenarios
The structural design of floor springs gives them stronger environmental adaptability and service life, reducing long-term maintenance costs:
- Sturdy structure, wear-resistant and anti-agingCore components (such as hydraulic cylinders, rotating shafts, and springs) are mostly made of corrosion-resistant materials like brass and stainless steel, with excellent sealing performance. They can effectively isolate dust and water vapor (some waterproof models can be used for semi-outdoor doors), reducing rust or jamming of internal components. Under normal use, their service life can reach 5-10 years, which is much longer than that of ordinary door closers made of plastic or thin iron sheets.
- Adaptable to frequent use with strong stabilityDoors in public areas (such as shopping mall entrances and hospital corridors) can be opened thousands of times a day. The hydraulic buffer structure of floor springs can withstand the impact of high-frequency opening and closing, avoiding functional failures caused by repeated stress (such as faster door-closing speed and positioning failure) and ensuring stability during long-term use.
Additional value:
Adapting to Special Doors + Meeting Scenario Needs
Can be paired with positioning / buffering components to expand functions
The Heavenly Earth Axis can be combined with a separate locator (such as ground locator pins) and a buffer (such as hydraulic dampers) to achieve “90° positioning of the door body” (convenient for transporting items), “buffered door closing” (avoiding door body impact), etc., compensating for the lack of control function of pure mechanical Heavenly Earth Axes, and suitable for more scenarios (such as hospital corridor doors, shopping mall entrance doors).
Simple structure, low maintenance cost
The core components of the Heavenly Earth Axis are only the upper and lower rotating shafts, without complex hydraulic / pneumatic structures (different from floor springs). During daily use, it is less likely to encounter oil leakage, jamming, etc., and after component wear, only the rotating shafts need to be replaced, without the need to disassemble the door body as a whole, making maintenance more convenient and cost-effective.
Adapts to various installation environments
The bottom rotating shaft can be embedded in the ground (hidden installation) or fixed on the ground (exposed installation), and the top rotating shaft can be installed on the door lintel, ceiling or steel structure frame, suitable for different building structures (such as no ceiling space, high-floor door lintel), with higher installation flexibility than traditional hinges.
