A hinge that can be installed in the middle of a door pocket

Abstract

The utility model discloses a hinge can be installed in the middle of the door pocket, including first hinge board, second hinge board and fixed shaft. First hinge board is rotatably connected with the both ends of fixed shaft through two first hinging parts, and the both ends of fixed shaft are equipped with fixed cap, and the two first hinging parts are located between fixed cap and shaft sleeve respectively. Second hinge board is rotatably connected with fixed shaft through one second hinging part, and the both ends thereof are in contact with the end part of shaft sleeve. The core of the application lies in that the through hole leading to fixed shaft is formed on second hinge board, and graphite column is arranged in the hole and is pressed by spring, so that the friction surface of second hinging part and fixed shaft can be continuously lubricated automatically, and the abrasion and noise are reduced significantly. Second hinge board adopts Z type design, and the fixed hole structure is optimized, so that it is more suitable for hidden installation and is firmly connected.

Description

Technical Field

[0001] This utility model relates to the field of architectural hardware technology, specifically to a hinge that can be installed in the middle of a door frame. Background Technology

[0002] Hinges are used to connect doors to door frames. Over time, the lubricating oil in the hinges will be lost or dry out, causing abnormal noises or jamming during the closing and closing of the door.

[0003] To address the aforementioned issues, our company has developed a hinge that can be installed in the middle of a door frame (application number 202222190679.8). Its specific structure includes a hinge plate one, a hinge plate two, a fixed shaft, and a fixed cap. This invention features a bushing at the hinge joint between hinge plate one and hinge plate two, with graphite rings at both ends of the bushing. Under the action of a spring, the graphite rings press against the hinge joint end face of the hinge plate. Opening or closing the door causes friction between the hinge joint and the graphite rings. The graphite rings provide lubrication, and the graphite powder generated by the friction lubricates the hinge joint and the bushing, resulting in smoother and quieter hinge rotation.

[0004] Theoretically, the above-mentioned patent could utilize the powder generated by the graphite ring to lubricate the upper and lower end faces of the hinge. However, the contact distance between each hinge and the fixed shaft in this design is relatively short. When the hinge is in use, due to the weight of the door itself and the torque generated, part of the force of the hinge is point contact between adjacent end faces. Point contact leads to stress concentration, which accelerates the damage and aging of parts. However, this structure is also an open structure, and the graphite powder ground out will be squeezed to the outside by the contact points, making it difficult for the end face to retain graphite powder. Utility Model Content

[0005] The purpose of this invention is to provide a hinge that can be installed in the middle of a door frame to solve the problems mentioned in the background art.

[0006] The technical solution of this utility model is: a hinge that can be installed in the middle of a door frame, including a first hinge plate, a first hinge portion fixedly provided on the first hinge plate, a fixed shaft rotatably connected to the first hinge portion, fixed caps fixedly provided at both ends of the fixed shaft, and two bushings slidably provided on the outer side of the fixed shaft. The first hinge plate has two first hinge portions, each of which is located between the fixed cap and the bushing. A second hinge plate is rotatably connected to the outer side of the fixed shaft. The second hinge plate is rotatably connected to the fixed shaft through a second hinge portion surrounding the outer side of the fixed shaft. The second hinge portion is located in the middle of the two bushings. There is one second hinge portion, and both ends of it are in contact with the ends of the bushings. A through hole is opened on the surface of the second hinge plate. The other end of the through hole passes through the surface of the fixed shaft. A graphite column is provided at the end of the through hole near the fixed shaft. The graphite column can lubricate the cylindrical surface in contact with the fixed shaft of the second hinge portion. A spring is fixedly provided at the end of the graphite column away from the fixed shaft.

[0007] Preferably, an adjusting bolt is threaded to the end of the through hole away from the fixed shaft, and the adjusting bolt is used to adjust the tension of the spring.

[0008] Preferably, the second hinge plate has a "Z" shaped cross-section, and the through hole is formed on the surface at its first bend.

[0009] Preferably, the second hinge portion is elongated.

[0010] Preferably, the first hinge plate has 7 through-holes symmetrically provided, and the second hinge plate has 5 through-holes symmetrically provided. The hinge can be fixed to the door frame or door by fixing screws through the fixing holes.

[0011] Preferably, the diameter of the fixing hole on the mating surface is smaller than the diameter of the non-matting surface.

[0012] This utility model provides an improved hinge that can be installed in the middle of a door frame, which has the following improvements and advantages compared with the prior art: Firstly, this invention places the graphite column within a closed environment inside the second hinge plate. When the hinge rotates, the lubricating powder ground from the graphite column is completely confined within the sealed friction pair space formed by the second hinge and the fixed shaft, effectively avoiding the problem of traditional lubricating grease overflowing and contaminating the door leaf, door frame, or surrounding environment, thus maintaining a clean installation environment. Simultaneously, this design ensures that the graphite powder can be directly and efficiently applied to the contact surfaces requiring lubrication, resulting in high lubricant utilization. Secondly, the second hinge portion of this invention is limited at both ends by the bushings, making its force-bearing contact with the fixed shaft closer to line contact (or narrow surface contact). Compared to the original point contact, this contact method avoids high local pressure, allowing the lubricating powder of the graphite column to be pressed and dispersed more evenly throughout the entire effective contact area, avoiding lubrication dead zones, and forming a more stable and uniform self-lubricating film. This greatly reduces the coefficient of friction, reduces wear, effectively prevents door sagging caused by hinge wear, and significantly extends the service life of the hinge. Attached Figure Description

[0013] The present invention will be further explained below with reference to the accompanying drawings and embodiments: Figure 1 This is a three-dimensional structural schematic diagram of the present invention; Figure 2 yes Figure 1 A magnified view of part A in the middle; Figure 3 This is a cross-sectional view of the second hinge plate in this utility model; Figure 4 yes Figure 3 A magnified view of part B in the middle section.

[0014] Explanation of reference numerals in the attached figures: 1. First hinge plate; 11. First hinge joint; 2. Second hinge plate; 21. Second hinge joint; 3. Fixed shaft; 4. Fixed cap; 5. Bushing; 6. Through hole; 61. Adjusting bolt; 62. Spring; 63. Graphite column; 7. Fixing hole Detailed Implementation

[0015] The present invention will now be described in detail, and the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0016] This utility model provides an improved hinge that can be installed in the middle of a door frame. The technical solution of this utility model is as follows: like Figure 1-4As shown, a hinge that can be installed in the middle of a door frame has two bushings 5 ​​slidably fitted onto a fixed shaft 3. The second hinge plate 2 has its second hinge portion 21 fitted into the middle of the fixed shaft 3, positioning it between the two bushings 5. The first hinge plate 1 has one first hinge portion 11 at each end, inserted from both ends of the fixed shaft 3, such that one side of each first hinge portion 11 contacts the end face of a bushing 5. Finally, fixing caps 4 are screwed onto both ends of the fixed shaft 3. Tightening the fixing caps 4 pushes the bushings 5 ​​to move axially, thereby pressing and fixing the first hinge portion 11. Simultaneously, the two bushings 5 ​​also clamp and limit the second hinge portion 21 from both sides, preventing it from rotating only around the fixed shaft 3 and thus preventing axial movement.

[0017] The second hinge plate 2 has a through hole 6 that extends from the outside of the plate to the surface of the fixed shaft 3 inside. A spring 62 and a graphite pillar 63 are installed inside the through hole 6. One end of the spring 62 abuts against the plug of the through hole 6, while the other end always applies a preload force toward the fixed shaft 3 to the graphite pillar 63, forcing the graphite pillar 63 to remain in contact with the surface of the fixed shaft 3.

[0018] Furthermore, the outer end of the through hole 6 is tapped with internal threads. An adjusting bolt 61 is screwed into this threaded hole. By turning the adjusting bolt 61, its depth in the through hole 6 can be changed, thereby directly adjusting the compression of the spring 62. Screwing in the adjusting bolt 61 increases the pressure on the spring 62, maintaining the original compression of the spring 62 when the graphite column 63 is worn down and shortened; conversely, unscrewing it allows it to be removed and replaced when the graphite column 63 is worn out.

[0019] Furthermore, the second hinge plate 2 has a Z-shaped overall cross-section. This structure allows it to fit perfectly into the slot at the top of the door leaf. The first bend of the Z-shape has high structural strength and is an ideal location for opening the through hole 6, which is easy to process and ensures the stability of the lubrication structure.

[0020] Furthermore, the second hinge portion 21 is an elongated sleeve structure extending axially along the fixed axis 3. Its altered contact method can withstand greater loads, especially effectively resisting the torque generated by the weight of the door leaf, thereby preventing the door leaf from sagging after prolonged use and improving the reliability and durability of the hinge.

[0021] Furthermore, the first hinge plate 1 and the second hinge plate 2 have 7 and 5 fixing holes 7 respectively. These holes are symmetrically distributed to ensure balanced force distribution after installation. Figure 1As shown, each fixing hole (7) is countersunk, meaning the hole diameter is smaller on the side facing the door frame or door leaf, while the non-fitting hole diameter is larger on the side facing outwards. During installation, the screw shank passes through the smaller diameter end, and the screw head is recessed into the countersunk recess at the larger diameter end. This ensures that the screw head will not protrude from the hinge plate surface after installation, allowing the door leaf and door frame to close tightly and smoothly without any interference. Working principle: The first hinge plate 1 is fixed to the door frame via fixing holes 7 and screws. Similarly, the second hinge plate 2 is fixed to the door leaf via fixing holes 7. The weight of the door leaf is transmitted through the first hinge plate 1 to its first hinge joint 11, and then through the contact surface between the first hinge joint 11 and the fixing shaft 3 to the fixing shaft 3. The fixing shaft 3 then distributes the force to the second hinge joint 21, which is ultimately borne by the second hinge plate 2 fixed to the door frame. When the weight of the door leaf generates a torque that causes the hinges to separate axially, the two bushings 5 ​​tightly abut against both ends of the first hinge joint 11, forming a strong axial restraint to prevent structural loosening. Simultaneously, the elongated second hinge joint 21 provides a larger load-bearing area, working together to prevent the door leaf from sagging.

[0022] Spring 62 continuously applies pressure to graphite column 63, causing it to press firmly against the surface of fixed shaft 3. When the user opens or closes the door, the second hinge plate 2 drives its second hinge portion 21 to rotate relative to fixed shaft 3. This rotation causes slight friction between the graphite column 63 and the surface of fixed shaft 3. During this friction, fine powder ground off the graphite column 63 falls directly and fills the gap between the second hinge portion 21 and fixed shaft 3. Because this space is enclosed, the graphite powder does not leak out but is effectively confined inside the friction structure. This graphite powder is evenly rolled in the line contact area between the second hinge portion 21 and fixed shaft 3, forming a strong solid lubricating film with an extremely low coefficient of friction. This achieves continuous, automatic, and clean lubrication, significantly reducing wear and noise and extending the service life of the hinge.

[0023] The foregoing description enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hinge that can be installed in the middle of a door frame, comprising a first hinge plate (1), the first hinge plate (1) being fixedly provided with a first hinge portion (11), the first hinge portion (11) being rotatably connected to a fixed shaft (3), the fixed shaft (3) having fixed caps (4) fixedly provided at both ends, and two bushings (5) slidably provided on the outer side of the fixed shaft (3), the first hinge plate (1) having two first hinge portions (11) and each first hinge portion (11) being located between the fixed caps (4) and the bushings (5), the outer side of the fixed shaft (3) being rotatably connected to a second hinge plate (2), the second hinge plate (2) being rotatably connected to the fixed shaft (3) through a second hinge portion (21) surrounding the outer side of the fixed shaft (3), the second hinge portion (21) being located in the middle of the two bushings (5), characterized in that: The number of the second hinge part (21) is one and both ends of it are in contact with the end of the bushing (5). The surface of the second hinge plate (2) is provided with a through hole (6). The other end of the through hole (6) passes through the surface of the fixed shaft (3). A graphite column (63) is provided at the end of the through hole (6) near the fixed shaft (3). The graphite column (63) can lubricate the cylindrical surface in contact between the second hinge part (21) and the fixed shaft (3). A spring (62) is fixedly provided at the end of the graphite column (63) away from the fixed shaft (3).

2. A hinge that can be installed in the middle of a door frame according to claim 1, characterized in that: The end of the through hole (6) away from the fixed shaft (3) is threaded with an adjusting bolt (61), which is used to adjust the tightness of the spring (62).

3. A hinge that can be installed in the middle of a door frame according to claim 1, characterized in that: The second hinge plate (2) has a "Z" shaped cross-section, and the through hole (6) is opened on the surface at its first bend.

4. A hinge that can be installed in the middle of a door frame according to claim 1, characterized in that: The second hinge part (21) is elongated.

5. A hinge that can be installed in the middle of a door frame according to claim 1, characterized in that: The first hinge plate (1) has 7 through fixing holes (7) symmetrically provided, and the second hinge plate (2) has 5 through fixing holes (7) symmetrically provided. The fixing holes (7) can be used to fix the hinge to the door frame or door by fixing screws.

6. A hinge that can be installed in the middle of a door frame according to claim 5, characterized in that: The diameter of the fixing hole (7) on the mating surface is smaller than the diameter of the non-matting surface.

Images