A support device for preventing sagging of a door

Abstract

The utility model discloses a kind of support device for preventing door sagging, it includes connecting seat, for fixed installation in door body lower end;First support rod, rotatably connected in one side of connecting seat;Second support rod, rotatably connected in the other side of connecting seat;Rotary shaft, install on connecting seat, and pass through connecting seat, first support rod and second support rod, so that first support rod and second support rod can be relatively rotated around rotary shaft;Eccentric adjusting assembly, set on second support rod, including eccentric part and the shaft portion of supporting eccentric part, the shaft portion is screwed in one side of second support rod, eccentric part is set on the shaft portion, and eccentric part can be contacted with the end of first support rod, to limit the included angle between first support rod and second support rod;Advantages are simple structure, convenient to adjust, self-locking reliable, effectively adapt to different degrees of door body sagging condition.

Description

Technical Field

[0001] This utility model relates to a support device, and more particularly to a support device for preventing a door from sagging. Background Technology

[0002] During the daily use of buildings, door panels often sag due to various factors such as their own weight, hinge wear, and door frame deformation. Door sagging not only affects the normal opening and closing function of the door, causing friction between the door panel and the ground and difficulty in closing, but also accelerates the damage to hinges and door frames, shortening their service life. This problem is particularly pronounced for air-raid shelter doors, large door panels, heavy-duty fire doors, and industrial plant doors, and in severe cases, can even pose safety hazards. Therefore, developing an effective door sagging prevention and support device is of great significance for ensuring the normal use of door panels, extending their service life, and improving the overall quality of building use.

[0003] In existing technologies, the main solutions to the door sagging problem are as follows: First, increase the load-bearing capacity by replacing the hinges with reinforced ones or increasing the number of hinges; second, install fixed-angle diagonal braces at the bottom of the door to support the door using the principle of triangular stability; third, use telescopic support rods, adjusting the length of the rods to adapt to different support needs; and fourth, install auxiliary support wheels on the door frame to reduce the burden on the hinges. These technical solutions alleviate the door sagging problem to some extent and provide diverse technical options for door support.

[0004] However, the above technologies have the following shortcomings: replacing the hinges requires disassembling the original door, which is complex and costly; fixed-angle diagonal braces lack adjustability and cannot adapt to changes in the degree of door sagging, requiring replacement when the door continues to sag; while telescopic braces offer some adjustment, their range is limited, and they often use threaded adjustments, resulting in poor accuracy and inconvenient operation; support wheel solutions are prone to causing ground wear and require a high degree of ground flatness. More importantly, existing technologies generally lack a simple and precise angle adjustment mechanism, making it difficult to accurately correct for the actual sagging of the door and achieve true stepless adjustment, thus limiting their practicality and adaptability. Summary of the Invention

[0005] The purpose of this utility model is to provide a support device to prevent door sagging. It has a simple structure, is easy to adjust, and has reliable self-locking, effectively adapting to different degrees of door sagging.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a support device for preventing door sagging, comprising,

[0007] Connecting bracket, used for fixed installation at the lower end of the door body;

[0008] The first support rod is rotatably connected to one side of the connecting seat;

[0009] The second support rod is rotatably connected to the other side of the connecting seat;

[0010] A rotating shaft is mounted on the connecting seat and passes through the connecting seat, the first support rod, and the second support rod, so that both the first support rod and the second support rod can rotate relative to each other around the rotating shaft;

[0011] An eccentric adjustment assembly is disposed on the second support rod, including an eccentric member and a shaft portion supporting the eccentric member. The shaft portion is screwed to one side of the second support rod, the eccentric member is sleeved on the shaft portion, and the eccentric member can contact the end of the first support rod to limit the included angle between the first support rod and the second support rod.

[0012] Preferably, the eccentric component is an eccentric nut, the shaft is a bolt, and the shaft is screwed onto the side wall of the second support rod. The central axis of the eccentric nut has an eccentricity with the center of its outer circumference. By rotating the eccentric nut, different positions of its outer circumference contact the end face of the first support rod, thereby changing the included angle between the first support rod and the second support rod.

[0013] Preferably, both the first support rod and the second support rod are rectangular square tube structures.

[0014] Preferably, the end of the first support rod has a flat plate-like structure and includes a first arc segment on the upper side and a second arc segment on the lower side. The first arc segment and the second arc segment together form a semi-circular profile, wherein the second arc segment forms an arc-shaped contact surface facing the eccentric member for contacting the outer circumferential surface of the eccentric member.

[0015] Preferably, the end of the second support rod is a flat plate-like structure, and the end profile of the second support rod is arc-shaped.

[0016] Preferably, the second support rod is further provided with two threaded holes for mounting the shaft, and the two threaded holes are distributed vertically at intervals.

[0017] Preferably, the connecting seat includes a first ear plate, a second ear plate, and a connecting plate connecting the first ear plate and the second ear plate, wherein the first ear plate and the second ear plate are respectively provided with coaxial shaft holes, and one end of the rotating shaft passes through the two shaft holes and is connected to a retaining ring.

[0018] Compared with existing technologies, the advantages of this utility model are as follows: the device has significant advantages such as simple structure, convenient adjustment, and strong adaptability. It achieves the limitation of the support angle through an eccentric adjustment component: when the door sags, the connecting seat is fixedly installed at the lower end of the door, and the first and second support rods extend downwards to form a support structure. Since both the first and second support rods are pivotally connected to the connecting seat via a rotating shaft, they can rotate freely relative to each other. In use, first adjust the first and second support rods to the required support angle, then rotate the eccentric component. Utilizing its eccentric characteristics, the outer circumference of the eccentric component gradually approaches and finally abuts against the end of the first support rod. When the eccentric component contacts the first support rod, the included angle between the two support rods is locked at the current position, preventing the angle from changing.

[0019] The advantage of this design lies in its ability to flexibly adjust the support angle according to the actual degree of door sagging. Precise angle definition and reliable locking are achieved through the rotation of the eccentric component. The contact pressure between the eccentric component and the first support rod provides a stable limiting effect, ensuring the stability of the support device during use. The entire device has few parts, low cost, and is easy to install. It can be installed and adjusted without disassembling the door, effectively adapting to different degrees of door sagging, and possesses wide applicability and good adjustment accuracy. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only embodiments of this application. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is the main view of the present utility model. Figure 1 ;

[0022] Figure 2 This is the main view of the present utility model. Figure 2 ;

[0023] Figure 3 This is a three-dimensional structural diagram of the present invention;

[0024] Figure 4 This is a three-dimensional structural diagram of the present invention in its disassembled state;

[0025] In the figure, 1 is the connecting seat; 2 is the first support rod; 3 is the second support rod; 4 is the rotating shaft; 5 is the eccentric adjustment assembly; 6 is the eccentric part; 7 is the shaft; 8 is the first arc segment; 9 is the second arc segment; 10 is the arc-shaped contact surface; 11 is the threaded hole; 12 is the first ear plate; 13 is the second ear plate; 14 is the connecting plate; 15 is the shaft hole; and 16 is the snap ring. Detailed Implementation

[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] Example 1: As shown in the figure, a support device for preventing door sagging includes,

[0028] Connector 1 is used for fixed installation at the lower end of the door body;

[0029] The first support rod 2 is rotatably connected to one side of the connecting seat 1;

[0030] The second support rod 3 is rotatably connected to the other side of the connecting seat 1;

[0031] The rotating shaft 4 is installed on the connecting seat 1 and passes through the connecting seat 1, the first support rod 2 and the second support rod 3, so that the first support rod 2 and the second support rod 3 can rotate relative to each other around the rotating shaft 4;

[0032] An eccentric adjustment assembly 5 is disposed on the second support rod 3, including an eccentric member 6 and a shaft portion 7 supporting the eccentric member 6. The shaft portion 7 is screwed to one side of the second support rod 3, and the eccentric member 6 is sleeved on the shaft portion 7. The eccentric member 6 can contact the end of the first support rod 2 to limit the included angle between the first support rod 2 and the second support rod 3.

[0033] In this embodiment, the eccentric part 6 is an eccentric nut, and the shaft part 7 is a bolt. The shaft part 7 is screwed onto the side wall of the second support rod 3. The central axis of the eccentric nut has an eccentricity with the center of its outer circumference. By rotating the eccentric nut, different positions of its outer circumference contact the end face of the first support rod 2, thereby changing the included angle between the first support rod 2 and the second support rod 3.

[0034] The eccentric nut adjustment structure adopts a standard threaded connection method. The eccentric nut is used in conjunction with the bolt. The parts are simple in structure, easy to process, and inexpensive. This universal design makes the components readily available in the market, and maintenance and replacement are convenient, which greatly reduces the manufacturing and use costs of the device.

[0035] Because there is an eccentricity between the central axis of the nut and the center of the outer circumference, when the eccentric nut is rotated, different positions on its outer circumference will contact the first support rod 2 in sequence, realizing continuous stepless adjustment of the support angle. This adjustment method is highly accurate and intuitive to operate, and can be precisely adjusted according to the actual degree of sag of the door, avoiding the limitations of traditional fixed angle support devices.

[0036] In terms of reliability, the structure has excellent self-locking performance. The self-locking characteristics of the threaded connection itself, combined with the friction between the outer circumferential surface of the eccentric nut and the end face of the first support rod 2, form a stable double locking mechanism. After adjustment, the support angle can remain stable for a long time and will not loosen due to vibrations caused by door opening and closing or other external forces, thus ensuring the durability of the support effect.

[0037] The screw-in installation method provides ample operating space for the rotation and adjustment of the eccentric nut, making it easy to adjust using conventional tools such as wrenches. This improves the efficiency of on-site installation and debugging. The overall structure is compact and reasonable, does not occupy extra space around the door, and has good practicality.

[0038] In this embodiment, both the first support rod 2 and the second support rod 3 are rectangular square tube structures.

[0039] Compared to round tubes or other cross-sectional shapes, rectangular square tubes have higher bending stiffness and torsional resistance. They are less prone to deformation when subjected to the pressure generated by the weight of the door, providing stable and reliable support for the door. Furthermore, when used with connecting seat 1, the flat surface of the square tube can provide a larger contact area, resulting in high connection strength. When installing the eccentric adjustment component 5, the bolts can be vertically fixed to the flat side wall of the square tube, ensuring accurate installation positioning and a firm and reliable connection.

[0040] In this embodiment, the end of the first support rod 2 is a flat plate-shaped structure, and includes a first arc segment 8 located on the upper side and a second arc segment 9 located on the lower side. The first arc segment 8 and the second arc segment 9 together form a semi-circular outline. The second arc segment 9 forms an arc-shaped contact surface 10 facing the eccentric member 6 for contacting the outer circumferential surface of the eccentric member 6.

[0041] The semi-circular contour design allows the first support rod 2 to rotate freely within a wide angle range without interfering with other components, ensuring smooth adjustment. The second arc segment 9, as the main contact surface, has an arc design that forms an ideal contact fit with the outer circumference of the eccentric nut. When the eccentric nut rotates, its outer circumference always maintains good contact with the second arc segment 9, avoiding stress concentration and localized wear that might occur with point or line contact. This surface contact not only improves contact stability but also effectively disperses contact pressure, extending the service life of the components. Simultaneously, the arc-shaped contact surface 10 ensures that the eccentric nut smoothly contacts the first support rod 2 at different rotational positions, achieving continuity and stability in the adjustment process.

[0042] From a mechanical perspective, the semi-circular end structure effectively converts the thrust of the eccentric component 6 into a limiting effect on the first support rod 2. When the eccentric nut abuts against the second arc segment 9, the contact point is located below the rotating shaft 4, forming a stable mechanical support system that effectively prevents the first support rod 2 from rotating unexpectedly.

[0043] In this embodiment, the end of the second support rod 3 is a flat plate-like structure, and the end profile of the second support rod 3 is arc-shaped.

[0044] In terms of structural strength, the arc-shaped profile eliminates sharp stress concentration points, making the stress distribution more uniform when the end bears the load transmitted by the rotating shaft 4, effectively improving the fatigue strength and service life of the structure. In terms of assembly, the arc-shaped profile facilitates the positioning and rotation of the end within the connecting seat 1, reduces the risk of interference during rotation, and improves rotation flexibility.

[0045] In this embodiment, the second support rod 3 is also provided with two threaded holes 11 for mounting the shaft 7, and the two threaded holes 11 are distributed vertically at intervals.

[0046] The configuration of the double threaded holes 11 provides multiple options for the installation of the eccentric adjustment assembly 5, enabling the device to adapt to different usage scenarios and adjustment requirements. When a larger adjustment range is required, the upper threaded hole 11 can be selected to install the eccentric nut, obtaining a larger adjustment space; when a more stable support effect is required, the lower threaded hole 11 can be selected, making the eccentric nut closer to the center of the rotating shaft 4, improving the stability of the support.

[0047] Furthermore, during long-term use, if one of the threaded holes 11 experiences thread wear or stripping due to frequent disassembly or accidental damage, the other threaded hole 11 can be immediately used without replacing the entire support rod. This significantly improves the lifespan and maintenance convenience of the device, and this design avoids the risk of the entire device failing due to a single point of failure.

[0048] In this embodiment, the connecting seat 1 includes a first ear plate 12, a second ear plate 13 arranged opposite to each other, and a connecting plate 14 connecting the first ear plate 12 and the second ear plate 13. The first ear plate 12 and the second ear plate 13 are respectively provided with coaxial shaft holes 15. One end of the rotating shaft 4 passes through the two shaft holes 15 and is connected to a retaining ring 16.

[0049] The connecting plate 14 is connected between the first ear plate 12 and the second ear plate 13. It not only serves as a rigid connection, but more importantly, it provides an installation interface with the lower end of the door. The planar structure of the connecting plate 14 facilitates a firm connection with the door through bolts or welding. Its large contact area ensures the uniform transmission of load and avoids stress concentration. At the same time, the connecting plate 14 integrates the two ear plates into a single structure, which improves the overall rigidity and load-bearing capacity of the connecting seat 1.

[0050] As an axial positioning element, the snap ring 16 is very easy to install and remove, requiring only snap ring 16 clamps. This detachable connection not only facilitates device assembly but, more importantly, makes subsequent maintenance and component replacement easier. When adjustment or replacement of the support rod is needed, simply remove the snap ring 16 to pull out the rotating shaft 4; the entire disassembly and assembly process is quick and efficient.

[0051] To support the heavier door, all components of this device are preferably made of high-strength materials. The first support rod 2 and the second support rod 3 can be made of Q235 carbon steel, Q345 low-alloy high-strength steel, or 45# high-quality carbon structural steel. These materials possess excellent tensile and yield strength; Q345 steel, in particular, has a yield strength of up to 345 MPa, capable of supporting heavy-duty fire doors, industrial plant doors, etc. The pivot 4, as a key load-bearing component, can be made of 40Cr alloy steel and tempered, achieving a tensile strength of over 980 MPa, exhibiting extremely high shear resistance and wear resistance. The connecting seat 1 can be welded from Q235 carbon steel or integrally cast from ductile iron, ensuring structural strength while facilitating manufacturing. The eccentric part 6 and the shaft 7 require frequent adjustment; therefore, they can be made of 45# steel and surface-hardened to improve the hardness and wear resistance of the contact surfaces, extending their service life. For applications in humid environments or outdoors, all components should be hot-dip galvanized or treated with Dacromet for corrosion protection to ensure that load-bearing capacity is not reduced due to rust over long-term use.

[0052] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A support device for preventing door sagging, characterized in that: include, Connecting bracket, used for fixed installation at the lower end of the door body; The first support rod is rotatably connected to one side of the connecting seat; The second support rod is rotatably connected to the other side of the connecting seat; A rotating shaft is mounted on the connecting seat and passes through the connecting seat, the first support rod, and the second support rod, so that both the first support rod and the second support rod can rotate relative to each other around the rotating shaft; An eccentric adjustment assembly is disposed on the second support rod, including an eccentric member and a shaft portion supporting the eccentric member. The shaft portion is screwed to one side of the second support rod, the eccentric member is sleeved on the shaft portion, and the eccentric member can contact the end of the first support rod to limit the included angle between the first support rod and the second support rod.

2. The support device for preventing door sagging according to claim 1, characterized in that: The eccentric component is an eccentric nut, and the shaft is a bolt. The shaft is screwed onto the side wall of the second support rod. The central axis of the eccentric nut has an eccentricity with the center of its outer circumference. By rotating the eccentric nut, different positions of its outer circumference contact the end face of the first support rod, thereby changing the included angle between the first support rod and the second support rod.

3. The support device for preventing door sagging according to claim 1, characterized in that: Both the first support rod and the second support rod are rectangular square tube structures.

4. The support device for preventing door sagging according to claim 1, characterized in that: The end of the first support rod has a flat plate-like structure and includes a first arc segment on the upper side and a second arc segment on the lower side. The first arc segment and the second arc segment together form a semi-circular profile. The second arc segment forms an arc-shaped contact surface facing the eccentric member for contacting the outer circumferential surface of the eccentric member.

5. A support device for preventing door sagging according to claim 1, characterized in that: The end of the second support rod is a flat plate-like structure, and the end profile of the second support rod is arc-shaped.

6. A support device for preventing door sagging according to claim 1, characterized in that: The second support rod is also provided with two threaded holes for mounting the shaft, and the two threaded holes are distributed vertically at intervals.

7. A support device for preventing door sagging according to claim 1, characterized in that: The connecting seat includes a first ear plate, a second ear plate, and a connecting plate connecting the first ear plate and the second ear plate. The first ear plate and the second ear plate are respectively provided with coaxial shaft holes. One end of the rotating shaft passes through the two shaft holes and is connected to a retaining ring.

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