Door hinges

Abstract

There is provided a door hinge including a fixed body having a first connecting shaft and a second connecting shaft installed inside along the length direction, a link assembly having both ends hinged to the fixed body and the movable body, respectively, a movable body having a sliding block installed inside and capable of sliding along the depth direction, one end of the sliding block hinged to one end of the link assembly, and a track plane and a track slope inclined toward the center of the sliding block installed on one side of the sliding block, and an automatic closing mechanism installed on the side close to the track plane inside the movable body, having an expandable structure, one end abutting against a side surface of the sliding block, and driving the sliding block to slide into the movable body when the end abuts against the track slope and extends. The door hinge is a concealed hinge and also has an automatic closing function.

Description

[Technical field]

[0001] This application claims priority to and benefits from a Chinese patent application having application number 2021101783812, filed on February 9, 2021, and entitled "Door Hinge", and a Chinese patent application having application number 2021107798205, filed on July 9, 2021, and entitled "Pressure Adjustment Device for Door Hinge Automatic Closing Mechanism and Door Hinge Including Same", the entire contents of which are incorporated herein by reference.

[0002] FIELD OF THE DISCLOSURE The present disclosure relates to the field of door hardware, and more particularly to concealed self-closing door hinges. [Background technology]

[0003] At present, the doors of buildings such as shopping malls, apartment complexes, office buildings, and conference rooms are often doors that can be closed automatically, and one of the ways to achieve such doors is to use door hinges with a self-closing function. However, door hinges with a self-closing function are often surface-mounted hinges, and the exposed parts of such surface-mounted hinges tend to impair the overall effect of the door. In contrast, traditional concealed door hinges are installed in a concealed manner, but cannot achieve the effect of automatically closing the door. Summary of the Invention

[0004] One embodiment of the present disclosure has been made to solve the above technical problems, and its objective is to provide a door hinge that can not only realize hidden installation, but also realize a self-closing function.

[0005] In order to achieve the above object, a door hinge according to an embodiment of the present disclosure includes: a fixed body which is a hollow case; A link assembly including a plurality of link blocks for connecting the movable body and the fixed body; a movable body including a hollow case in which a sliding block capable of sliding along a depth direction is installed, one end of the sliding block being hingedly connected to the link assembly, and a track plane and a track slope inclined toward the center of the sliding block being installed on one side of the sliding block; the movable body is provided on a side closer to the trajectory plane, has an expandable structure that can expand and contract along the length of the movable body, has one end abutting against a side surface of the sliding block, and includes a self-closing mechanism that drives the sliding block to slide into the movable body when the end abuts against the trajectory slope and extends.

[0006] As can be seen from the above description and practice, the door hinge according to one embodiment of the present disclosure can not only realize hidden installation, but also realize self-closing function. [Brief description of the drawings]

[0007] The above features and technical advantages of the present disclosure will become more apparent and can be readily understood by reading the following detailed description of the embodiments with reference to the accompanying drawings. [Figure 1] 1 is a schematic perspective view of a door hinge according to a first embodiment of the present disclosure; [Diagram 2] FIG. 1 is a plan view of a door hinge according to a first embodiment of the present disclosure. [Diagram 3] FIG. 2 is a schematic exploded view of the door hinge according to the first embodiment of the present disclosure at a first viewing angle. [Figure 4] FIG. 2 is a schematic exploded view of the door hinge according to the first embodiment of the present disclosure at a second viewing angle. [Diagram 5] FIG. 2 is a schematic internal configuration diagram of the door hinge according to the first embodiment of the present disclosure at a first viewing angle, in which the adjustment mechanism is disassembled to clearly show each component. [Figure 6] FIG. 11 is a schematic internal configuration diagram of the door hinge according to the first embodiment of the present disclosure at a third viewing angle, in which the adjustment mechanism is disassembled to clearly show each component. [Figure 7] FIG. 2 is a schematic configuration diagram of the AA cross section in FIG. 1, showing only the cross-sectional structure of a movable body. [Figure 8] 2 is a schematic configuration diagram of the AA cross section in FIG. 1, showing only the cross-sectional structure of the movable body when the cushioning mechanism starts cushioning. FIG. [Figure 9] FIG. 2 is a schematic configuration diagram of the cross section AA in FIG. 1, showing only a schematic diagram of the cross-sectional structure of the movable body when the door hinge is automatically closed. [Figure 10] FIG. 2 is a schematic configuration diagram of the cross section BB in FIG. 1, showing the cross-sectional structure of the door hinge when the cushioning mechanism starts cushioning. [Figure 11] FIG. 2 is a schematic diagram of the cross section taken along the line BB in FIG. 1, showing the cross-sectional structure of the door hinge when the cushioning of the cushioning mechanism has finished. [Figure 12] FIG. 2 is a schematic configuration diagram of a sliding block according to the first embodiment of the present disclosure. [Figure 13] FIG. 2 is a schematic exploded view of a link assembly according to the first embodiment of the present disclosure. [Figure 14] FIG. 11 is a schematic perspective view of a door hinge according to a second embodiment of the present disclosure. [Figure 15] 15 is a schematic configuration diagram of the CC cross section in FIG. 14, showing only the cross-sectional structure of the movable body. FIG. [Figure 16] FIG. 11 is a schematic exploded configuration diagram of an adjustment mechanism according to a second embodiment of the present disclosure.

[0008] 1 ... fixed body, 11 ... fixed base, 12 ... fixed block of fixed base, 13 ... first connecting shaft, 14 ... second connecting shaft, 15 ... through hole of fixed body, 2...link assembly, 21...first link block, 22...second link block, 23...third link block, 24...fourth link block, 25...shaft sleeve, 3... Movable body, 31... First fixed block of movable base, 32... Second fixed block of movable base, 33... Movable base, 34... Sliding block, 35... In-line bearing, 36... Through hole of movable body, 37... First bearing, 38... First guide groove, 39... Second guide groove, 340... Track inclined surface, 341... Track plane, 342... First track inclined surface, 343... Second track inclined surface, 4...automatic closing mechanism, 41...accumulator spring, 42...spring slider, 43...second bearing, 5... Buffer mechanism, 51... Damping slider, 52... Damper, 53... Eject plate, 54... Eject block, 6...adjustment mechanism, 61...spring ejection block, 62...first screw, 63...worm gear, 64...worm screw, 65...fixing block, 66...buckle, 67...first slider, 68...second slider, 69...second screw, 671...first inclined surface, 681...second inclined surface, 682...position limiting groove, 691...connection part. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, the exemplary embodiments will be described more completely with reference to the drawings. However, the exemplary embodiments may be implemented in various forms and should not be understood as being limited to the examples set forth herein. On the contrary, by providing these embodiments, the present disclosure will be more thorough and complete, and the concept of the exemplary embodiments will be fully conveyed to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner into one or more embodiments.

[0010] In addition, the drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. In the drawings, the same or similar parts are represented by the same reference numerals, and their description will not be repeated. In this disclosure, the terms "including," "disposed," and "installed" are intended to indicate a non-limiting inclusion meaning, and mean that there may be other elements / components / etc. in addition to the listed elements / components / etc. The terms "first," "second," etc. are merely used as marks and do not limit the number or order of their objects. The orientations or positional relationships indicated by the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," etc. are based on the orientations or positional relationships shown in the drawings, and are merely intended to easily explain and simplify the present disclosure, and do not indicate or suggest that the devices or elements shown must have a specific orientation and be configured and operated in a specific orientation, and should not be understood as limiting the present disclosure.

[0011] Unless otherwise specified and limited, the meaning of the terms "attached", "coupled" and "connected" should be broadly understood, for example, it may be fixed connection, detachable connection, integral connection, mechanical connection, electrical connection, direct connection, indirect connection through an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present disclosure according to the specific situation.

[0012] In this disclosure, the singular forms (e.g., a, an) are intended to include the plural forms unless otherwise specified. Furthermore, in this disclosure, unless otherwise specified, when "one embodiment," "some embodiments," or similar expressions are used, they may refer to the same one or several embodiments or to different one or several embodiments.

[0013] Example 1 1 to 7, the door hinge in this embodiment is a hidden hinge and has a function of automatically closing within a predetermined angle range. Specifically, the door hinge includes a fixed body 1, a link assembly 2, a movable body 3, and an automatic closing mechanism 4. In use, the fixed body 1 is installed on the door frame and the movable body 3 is installed on the door leaf, or the movable body 3 is installed on the door frame and the fixed body 1 is installed on the door leaf. Both ends of the link assembly 2 are connected to the fixed body 1 and the movable body 3, respectively, and drive the fixed body 1 and the movable body 3 to approach each other when the door is closed, and drive the fixed body 1 and the movable body 3 to move away from each other when the door is opened.

[0014] The fixed body 1 is composed of a fixed base 11 and a fixed block 12 of the fixed base. The fixed base 11 has a hollow cavity in the center, and connection plates for connecting to the door frame are installed at both ends, so that the fixed body 1 can be fixed to the door frame by screws. The fixed block 12 of the fixed base is removably attached in the cavity in the center of the fixed base 11 by bolts. The fixed block 12 of the fixed base has a U-shaped structure, and has a cavity between the fixed base 11 and the fixed base 11 to accommodate a part of the link assembly 2. In the fixed block 12 of the fixed base, a first connecting shaft 13 and a second connecting shaft 14 are arranged in this order along the depth direction of the fixed base 11, and the first connecting shaft 13 is adjacent to one side of the inside of the fixed base 11. In the exploded views of Figures 3 and 4, the first connecting shaft 13 and the second connecting shaft 14 that are simultaneously inserted into the link assembly 2 are not exploded in order to show the connection relationship between the fixed body 1 and the link assembly 2.

[0015] The above-mentioned fixed body 1 has a structure in which a fixed base 11 and a fixed block 12 of the fixed base are assembled, but the purpose of this is to facilitate the assembly of the door hinge. In other embodiments, the fixed base 11 and the fixed block 12 of the fixed base may be installed as an integral structure, in which case the functions of self-closing and hidden installation can be similarly realized.

[0016] 13, the link assembly 2 includes a first link block 21, a second link block 22, a third link block 23, and a fourth link block 24. The link blocks are all plates having a radius, and a through hole for passing a connecting shaft is formed at each end. A notch is formed in the center of the third link block 23 into which the fourth link block 24 fits, and a through hole for passing the connecting shaft is formed in the center of the notch and in the center of the fourth link block 24, so that the center of the third link block 23 and the center of the fourth link block 24 are hingedly connected via the connecting shaft.

[0017] The first link block 21 and the second link block 22 have one ends hinged to the first connecting shaft 13, and the other ends hinged integrally to one end of the third link block 23 by a connecting shaft. One end of the fourth link block 24 close to the fixed body 1 is hinged to the second connecting shaft 14.

[0018] The movable body 3 is composed of a movable base 33, a first fixed block 31 of the movable base, and a second fixed block 32 of the movable base. The movable base 33 has a hollow cavity in the center, and connection plates for connecting to the door are installed at both ends. The first fixed block 31 of the movable base and the second fixed block 32 of the movable base are detachably fixed to the movable base 33 by rivets, and divide the cavity in the movable base 33 into three accommodation cavities for accommodating the sliding block 34, the self-closing mechanism 4, and the buffer mechanism 5. The first fixed block 31 of the movable base is provided with opposing through holes for passing through the connection shaft, and the adjacent side walls of the first fixed block 31 of the movable base and the second fixed block 32 of the movable base are also formed with through holes for passing through the connection shaft, and these two through holes are used to hinge-connect the third link block 23. The third link block 23 has two support arms at one end close to the movable body 3, which are hingedly connected to a first fixed block 31 of the movable base and a second fixed block 32 of the movable base by connecting shafts.

[0019] A sliding block 34 is slidably mounted at a position facing the fourth link block 24 in the movable body 3, and a position limiting groove is provided on the inner wall of the movable body 3, along which the sliding block 34 slides in the depth direction. Referring to Fig. 12, a U-shaped notch is provided in the center of the sliding block 34, and opposing through holes are provided on two side walls of the U-shaped notch for hinge connection to the end of the fourth link block 24 by a connecting shaft. When the door is opened or closed, the fourth link block 24 drives the sliding block 34 to slide in the depth direction of the movable body 3.

[0020] One side of the sliding block 34 is flat and abuts against the side wall of the second fixed block 32 of the movable base. An in-line bearing 35 is further installed between the side wall of the second fixed block 32 of the movable base and the sliding block 34 to improve the sliding efficiency of the sliding block 34. On the other side of the sliding block 34, i.e., the side closer to the first fixed block 31 of the movable base, a track plane 341 and a track slope are installed which are connected to each other, and the track slope is inclined toward the center of the sliding block 34 and cooperates with the automatic closing mechanism 4 to drive the sliding block 34 to slide toward one side of the interior of the movable body 3, thereby driving the door hinge to close. In this embodiment, a total of two track slopes are installed, which are a first track slope 342 and a second track slope 343 which are installed in order along the depth direction. The included angle between the first track slope 342 and the track plane 341 is α1, and the included angle between the second track slope 343 and the track plane 341 is α2, and α1<α2. The adjacent points of the track plane 341, the first track slope 342, and the second track slope 343 are designed to be inverse arcs so that the self-closing mechanism 4 rolls thereon. In one embodiment, 9°≦α1<45°, 24°≦α2≦45°.

[0021] In this embodiment, the specific structural form of the link assembly 2 and its connection relationship with the fixed body 1 and the movable body 3 are shown, but in other embodiments, the specific configuration structure of the link assembly 2 may be changed, for example, the number of link blocks may be increased or decreased or the shape of the link blocks may be changed to achieve the function of a hidden door hinge.

[0022] The fixed block 12 of the fixed base, the first link block 21, the second link block 22, the third link block 23, the fourth link block 24, the sliding block 34, the first fixed block 31 of the movable base, and the second fixed block 32 of the movable base are hingedly connected together in the form of a connecting shaft, and in order to avoid friction between adjacent structures, a shaft sleeve 25 is further fitted onto the connecting shaft at the hinge connection point.

[0023] The automatic closing mechanism 4 is installed on the side closer to the locus plane 341 within the movable body 3, and has an expandable structure, being expandable along the length direction of the movable body 3, with one end abutting against the side surface of the sliding block 34. When the end of the automatic closing mechanism 4 abuts against the locus slope, the sliding block 34 is driven to slide into the movable body 3 by its own elastic force, and the door hinge is driven to close.

[0024] 8 and 9, in this embodiment, the self-closing mechanism 4 includes an accumulator spring 41, a spring slider 42, and a second bearing 43. The accumulator spring 41 is installed along the length of the movable body 3, one end of which is connected to the inner wall of the movable body 3 via an adjustment mechanism 6, and the spring slider 42 is installed at the other end. As shown in Figs. 3 and 4, which are exploded views, the spring slider 42 has a U-shaped structure, and two of the accumulator springs 41 are installed inside. The second bearing 43, which abuts against the side surface of the sliding block 34, is hingedly connected to one end of the spring slider 42 away from the accumulator spring 41. The spring slider 42 is movable along the length of the movable body 3 under the action of the elastic force of the accumulator spring 41. When the door hinge is fully open, the sliding block 34 is located near the outer end of the movable body 3, and at this time, the second bearing 43 abuts against the locus plane 341. When the door hinge is closed, the sliding block 34 gradually slides into the movable body, and when the second bearing 43 abuts against the first locus inclined surface 342, the acting force applied to the sliding block 34 by the automatic closing mechanism 4 has a component force along the depth direction, so that the sliding block 34 can be driven to continue sliding into the movable body 3, and the door hinge can be driven to automatically close. At this time, the angle at which the door hinge opens is the angle at which the door hinge automatically closes, and the magnitude of this angle can be adjusted by adjusting the start position of the first locus inclined surface 342.

[0025] The adjustment mechanism 6 is installed between the accumulator spring 41 and the inner wall of the movable body 3, and serves to adjust the power of the self-closing mechanism 4 by adjusting the magnitude of the elastic force of the accumulator spring 41. Referring to Figs. 3 to 7, the adjustment structure 6 includes a spring eject block 61, a first screw 62, a worm gear 63, a worm screw 64, and a fixed block 65. The spring eject block 61 has one end which is a plate, and the other end which is two support legs which penetrate the accumulator spring 41. One end of the first screw 62 is fixedly connected to the plate of the spring eject block 61, and the first screw 62 and the spring eject block 61 cannot rotate relative to each other, and a male screw thread is installed on the first screw 62. The worm gear 63 is screwed into the first screw 62, and the worm screw 64 meshes with the worm gear 63 to drive the worm gear 63 to rotate. The worm screw 64 is hinged to the movable body 3, one end of which penetrates the first fixed block 31 of the movable base, and the other end of which is reduced in diameter and penetrates the side wall of the movable base 33, and a buckle 66 is provided at the end of the worm screw 64 to prevent it from falling off the movable body 3. A slotted groove is provided on the end face of the worm screw 64 close to the first fixed block 31 of the movable base to rotate the worm screw 64 with a slotted screwdriver. The fixed block 65 has a hollow cylindrical structure, a screw thread is provided on its outer periphery, and penetrates the inner wall of the end of the movable base 33, one end of the first screw 62 penetrates the fixed block 65, and the end face of the worm gear 63 abuts against the end face of the fixed block 65, which serves to prevent the worm gear 63 from moving outside the movable base 33 along the length direction.

[0026] Under the action of the elastic force of the accumulator spring 41, the worm gear 63 always abuts against the end face of the fixed block 65, and when the worm screw 64 is rotated clockwise or counterclockwise, the worm gear 63 can be driven to rotate, and the movement of the worm gear 63 in the longitudinal direction is restricted, so that the first screw 62 moves along the longitudinal direction to adjust the distance between the spring ejection block 61 and the inner wall of the movable platform 33, that is, by adjusting the magnitude of the elastic force of the accumulator spring 41, it can be adapted to the door of different weights and the door can be closed smoothly.

[0027] 8 to 11, a buffer mechanism 5 for controlling the speed at which the door hinge closes is further installed in the movable body 3. The buffer mechanism 5 includes an ejection plate 53, a damper 52, and a damping slider 51. The ejection plate 53 is a rectangular plate that serves to detachably connect the buffer mechanism 5 to the movable base 33. The damper 52 may be a hydraulic damper or other existing damper, and one end is fixedly connected to the ejection plate 53 and the other end is a free end. The damping slider 51 has a U-shaped structure, and its grooved end is fitted into the free end of the damper 52, and a position limiting groove is installed in the movable base 33 to allow the damping slider 51 to slide along the depth direction. An ejection block 54 that protrudes outward is installed at one end of the damping slider 51 close to the fixed body 1, and the ejection block 54 is positioned outside the movable body 3 by the elastic force of the damper 52. In addition, a protrusion is provided on the fixed block 12 of the fixed base of the fixed body 1 at a position opposite to the ejection block 54. In the process of closing the door hinge, the ejection block 54 first abuts against the protrusion, and at this time, the damper 52 receives a force, slowing down the speed at which the door hinge closes. Preferably, when the second bearing 43 abuts against the second track inclined surface 343, the ejection block 54 abuts against the protrusion just right. Since the included angle between the second track inclined surface 343 and the track plane 341 is large, the acting force that the automatic closing mechanism 4 applies to the sliding block 34 along the depth direction is large, that is, the force for closing the door is large, so that the buffer mechanism 5 slows down the speed at which the door hinge closes and ensures that the door hinge has a sufficient acting force for closing the door.

[0028] When the door hinge is installed on the door and the door is opened, the second bearing 43 at one end of the automatic closing mechanism 4 abuts against the track plane 341 on the side of the sliding block 34, and the automatic closing mechanism 4 is perpendicular to the track plane 341, so that the force applied by the accumulator spring 41 to the sliding block 34 does not have a component along the depth direction of the movable body 3, and the door can be kept open. When the door is closed, the sliding block 34 moves inward along the depth direction of the movable body 3, and the second bearing 43 gradually rolls to one side of the track slope on the side of the sliding block 34, and when the second bearing 43 abuts against the track slope, the force applied by the accumulator spring 41 to the sliding block 34 has a component along the depth direction of the movable body 3, and the sliding block 34 continues to move into the movable body 3 without the need for an external force, so that the door can be driven to keep closing.

[0029] Example 2 In comparison with the first embodiment, this embodiment discloses a different structural form of the adjustment mechanism 6, and based on this, the structures of the fixed body 1 and the movable body 3 are adaptively changed. Therefore, only the contents different from the structure and connection relationship in the first embodiment will be described below.

[0030] 14 to 16, in this embodiment, the adjustment mechanism 6 is similarly installed between the accumulator spring 41 and the inner wall of the movable body 3, and serves to adjust the power of the self-closing mechanism 4 by adjusting the magnitude of the elastic force of the accumulator spring 41. Specifically, the adjustment mechanism 6 includes a first slider 67, a second slider 68, and a second screw 69. The first slider 67 is slidably mounted in the movable body 3, and is slidable along the expansion and contraction direction of the accumulator spring 41. A groove that accommodates the accumulator spring 41 is provided at one end of the first slider 67, one end of the accumulator spring 41 abuts against the inner wall of the groove, and a first inclined surface 671 is provided at the other end of the first slider 67. The second slider 68 is slidably mounted within the movable body 3, and its sliding direction is perpendicular to the expansion and contraction direction of the accumulator spring 41, i.e., it slides along the depth direction of the movable body 3. A second inclined surface 681 that abuts against the first inclined surface 671 is provided on the side surface of the second slider 68. The second screw 69 is screwed into the side wall of the movable body 3, and one end is rotatably connected to one end of the second slider 68 remote from the first slider 67. In use, the second slider 68 can be driven to slide by rotating the second screw 69, and the second inclined surface 681 comes into contact with the first inclined surface 671, driving the first slider 67 to slide along the length direction of the accumulator spring 41, thereby changing the length of the accumulator spring 41, i.e., changing the elastic force of the accumulator spring 41, and adjusting the pressure of the automatic closing mechanism 4 to suit door openings of different weights and stably closing the door opening.

[0031] Specifically, a connecting portion 691 is provided at one end of the second screw 69, and a position limiting groove 682 for accommodating the connecting portion 691 is provided at one end of the second slider 68, and the connecting portion 691 is engaged in the position limiting groove 682, so that the connecting portion 691 can rotate in the axial direction around the second screw 69. In this embodiment, the connecting portion 691 is round cake-shaped, and the position limiting groove 682 is a striped groove, and the opening dimension of the side is smaller than the outer diameter of the connecting portion 691, so that the connecting portion 691 is engaged in the position limiting groove 682 and is prevented from being displaced along the axial direction of the second screw 69 in the position limiting groove 682. In another embodiment, the connecting portion 691 may be spherical, and can similarly play the role of rotatably connecting the second screw 69 and the second slider 68.

[0032] If the side wall of the movable body 3 is thick, the outer end of the second screw 69 may be installed so as to be flush with the outer wall of the movable body 3. If the side wall of the movable body 3 is thin, the outer end of the second screw 69 may be exposed to the outside of the movable body 3, in which case the through hole 15 of the fixed body that accommodates the exposed portion of the second screw 69 needs to be installed in the side wall of the fixed body 1 so as to prevent the second screw 69 from contacting the fixed body 1 when the door hinge is closed.

[0033] In addition, a first inclined surface 671 is provided on the other end of the first slider 67, and since there is a possibility that the first inclined surface 671 may come into contact with the inner wall of the movable body 3 when the first slider 67 slides, a through hole 36 of the movable body is formed on the side wall of the movable body 3. When the first slider 67 slides to one end away from the automatic closing mechanism 4, the one end having the first inclined surface 671 enters the through hole 36 of the movable body, ensuring smooth sliding.

[0034] In addition, in order to ensure that the first slider 67 can slide only along the expansion and contraction direction of the accumulator spring 41, a first guide groove 38 is further provided in the movable body 3 along the length direction of the movable body 3, and the side of the first slider 67 abuts against the side of the first guide groove 38. In addition, a second guide groove 39 is further provided in the movable body 3 along the depth direction of the movable body 3, and both sides of the second slider 68 abut against the second guide groove 39, ensuring that the second slider 68 can slide only along the depth direction of the movable body 3.

[0035] Furthermore, this embodiment differs from the in-line bearing 35 in the first embodiment in that a first bearing 37 is installed between the sliding block 34 and the movable base 33. Specifically, the side surface of the sliding block 34 away from the automatic closing mechanism 4 is flat, and a first bearing 37 is installed at a position of the movable base 33 close to the flat surface, the outer circumferential surface of which abuts against the sliding block 34 and the axial direction of which is perpendicular to the sliding direction of the sliding block 34. By installing the first bearing 37 and changing the sliding friction between the sliding block 34 and the movable base 33 to rolling friction, the sliding efficiency of the sliding block 34 can be improved. Furthermore, the first bearing 37 has a simpler structure and is easier to install than the in-line bearing 35, and has a higher fixing effect within the movable base 33.

[0036] In some embodiments of the present disclosure, the door hinge further comprises:

[0037] (1) a fixed body which is a hollow case; A link assembly including a plurality of link blocks for connecting the movable body and the fixed body; a movable body including a hollow case in which a sliding block capable of sliding along a depth direction is installed, one end of the sliding block being hingedly connected to the link assembly, and a track plane and a track slope inclined toward the center of the sliding block being installed on one side of the sliding block; a self-closing mechanism that is installed on a side of the movable body closer to the trajectory plane, has an extendable structure that can extend and contract along the length of the movable body, has one end abutting against a side of the sliding block, and when the end abuts against the trajectory slope and extends, drives the sliding block to slide into the movable body.

[0038] (2) A first connecting shaft and a second connecting shaft are installed in the fixed body along the length direction, the link assembly includes a first link block, a second link block, a third link block, and a fourth link block; One end of each of the first link block and the second link block is hingedly connected to the first connecting shaft, and the other end is hingedly connected to one end of the third link block, The third link block has the other end hinged to a movable body, and has a notch in the center into which the fourth link block is inserted. The door hinge of (1), wherein one end of the fourth link block is hingedly connected to the second connecting shaft, a central portion of the fourth link block is hingedly connected within a notch of the third link block, and the other end of the fourth link block is hingedly connected to the sliding block.

[0039] (3) The self-closing mechanism includes: an accumulator spring disposed along the length of the movable body, one end of which is connected to the inner wall of the movable body and the other end of which is provided with a spring slider; and a spring slider having an end remote from the accumulator spring and a second bearing hingedly connected to the end of the sliding block, the second bearing abutting against a side surface of the sliding block.

[0040] (4) An adjustment mechanism for adjusting a distance between an end of the accumulator spring and the inner wall of the movable body is further installed between the accumulator spring and the inner wall of the movable body, and the adjustment mechanism includes: a spring ejector block having one end connected to an end of the accumulator spring and an opposite end fixedly connected to a first screw; a worm gear screwed onto the first screw; a worm screw hingedly connected to the movable body and meshing with the worm gear to drive the worm gear to rotate; The door hinge described in (3) includes a fixed block having a hollow cylindrical structure, installed on the inner wall of the end of the movable body, one end of the first screw passing through it, and an end face of the fixed block abutting against an end face of the worm gear.

[0041] (5) The door hinge according to (4), wherein one end of the worm screw penetrates the side wall of the movable body, and a buckle is provided at an outer end of the worm screw to limit the displacement of the worm screw along its own length.

[0042] (6) An adjustment mechanism for adjusting a distance between an end of the accumulator spring and the inner wall of the movable body is further installed between the accumulator spring and the inner wall of the movable body, and the adjustment mechanism includes: a first slider that is slidably mounted within the movable body and is slidable along the extension and contraction direction of the self-closing mechanism, one end of which is connected to the self-closing mechanism and the other end of which has a first inclined surface; a second slider that is slidably mounted within the movable body, the sliding direction of which is perpendicular to the extension and contraction direction of the automatic closing mechanism, and the second inclined surface that abuts against the first inclined surface is provided on a side surface of the second slider; A second screw that is screwed into the side wall of the movable body and has one end rotatably connected to one end of the second slider that is remote from the first slider.

[0043] (7) A connection portion is provided at one end of the second screw; The door hinge described in (6), wherein a position limiting groove that accommodates the connection portion is provided at one end of the second slider, and the connection portion is engaged within the position limiting groove and is rotatable axially around the second screw.

[0044] (8) A through hole of the fixing body that accommodates the exposed portion of the second screw is provided on a side wall of the fixing body, The door hinge according to (6), wherein a through hole of the movable body, through which the end of the first slider slides, is provided in a side wall of the movable body.

[0045] (9) A first guide groove is provided in the movable body, in which the first slider slides along the expansion and contraction direction of the accumulator spring, The door hinge according to (6), wherein a second guide groove in which the second slider slides is provided within the movable body.

[0046] (10) A buffer mechanism is further provided within the movable body to control the speed at which the door hinge closes, The buffer mechanism includes: an ejection plate removably connected to a side wall of the movable body; a damper having one end fixedly connected to the ejection plate and the other end being an expandable end; The door hinge described in (1) includes a damping slider that is slidably mounted within the movable body, is slidable along the depth direction of the movable body, has one end abutting the extension end of the damper, and has an ejection block protruding outward at the other end.

[0047] (11) The door hinge described in (10), wherein the movable body includes a movable base, a first fixed block of the movable base, and a second fixed block of the movable base, and a cavity is formed between the three to accommodate the sliding block, the automatic closing mechanism, and the buffer mechanism.

[0048] (12) The door hinge according to claim 10, wherein the fixed body includes a fixed base and a fixed block of the fixed base, and the fixed base and the fixed block of the fixed base are removably connected.

[0049] (13) The door hinge according to (12), wherein a protrusion facing the ejection block is provided on the fixed block of the fixed base.

[0050] (14) The door hinge according to (1), wherein the trajectory inclined surface includes a first trajectory inclined surface and a second trajectory inclined surface arranged in sequence, an included angle between the first trajectory inclined surface and the trajectory plane is α1, an included angle between the second trajectory inclined surface and the trajectory plane is α2, and α1<α2.

[0051] (15) The door hinge according to (14), wherein 9°≦α1<45° and 24°≦α2≦45°.

[0052] According to some embodiments of the present disclosure, all or some of the following advantages may be realized.

[0053] 1. In the door hinges according to some embodiments of the present disclosure, the fixed body and the movable body can be installed in the door frame and inside the door respectively, thereby realizing a hidden installation of the hinge, and an automatic-closing mechanism is installed inside the door hinge. When the door is closed, the included angle of the door hinge reaches a certain angle, and the door hinge can automatically close. This realizes both the hidden installation and the automatic-closing function.

[0054] 2. An adjustment mechanism for adjusting the magnitude of the force of the automatic closing mechanism is provided in the door hinge of some embodiments of the present disclosure. When the door hinge is installed on different doors, the magnitude of the force of the automatic closing mechanism can be adjusted according to the weight of the door, so as to suit doors of various specifications.

[0055] 3. The door hinges in some embodiments of the present disclosure are further equipped with a buffer mechanism, which can effectively reduce the speed at which the door hinges are closed, thereby reducing the noise generated during the door closing process.

[0056] It is obvious to those skilled in the art that the present disclosure is not limited to the details of the above exemplary embodiments, and the present disclosure can be embodied in other specific forms without departing from the spirit or essential characteristics of the present disclosure. Therefore, in all respects, the embodiments should be considered as illustrative and non-limiting, and the scope of the present disclosure is limited not by the above description but by the appended claims, and all modifications within the meaning and scope of the claims are intended to be included. Any reference signs in the claims do not limit the scope of the associated claims. [Industrial Applicability]

[0057] The door hinge of the present disclosure solves the problem that the conventional door hinge cannot combine the function of concealed installation and the function of self-closing, and is suitable for industrial use.

Claims

1. a fixed body which is a hollow case; A link assembly including a plurality of link blocks for connecting the movable body and the fixed body; a movable body including a hollow case in which a sliding block is installed inside, the sliding block being slidable along a depth direction, one end of the sliding block being hingedly connected to the link assembly, and a locus plane and a locus slope adjacent to the locus plane and inclined toward the center of the sliding block being installed on one side of the sliding block; a self-closing mechanism that is installed on a side of the movable body closer to the trajectory plane, has an expandable structure that is expandable and contractable along a longitudinal direction of the movable body perpendicular to the depth direction, has one end abutting against one side of the sliding block, and when the one end abuts against the trajectory slope and extends, drives the sliding block to slide into the movable body along the depth direction.

2. A first connecting shaft and a second connecting shaft are provided in the fixed body along a longitudinal direction of the fixed body, the link assembly includes a first link block, a second link block, a third link block, and a fourth link block; The first link block and the second link block have one end hinged to the first connecting shaft and the other end hinged to one end of the third link block, The third link block has the other end hinged to a movable body, and has a notch in the center into which the fourth link block is inserted.

2. The door hinge of claim 1, wherein the fourth link block has one end hinged to the second connecting shaft, a central portion hinged within a notch of the third link block, and an other end hinged to the sliding block.

3. The self-closing mechanism includes: an accumulator spring disposed along the length of the movable body, one end of which is connected to the inner wall of the movable body and the other end of which is provided with a spring slider; 2. The door hinge of claim 1 including a spring slider hingedly connected at one end remote from said accumulator spring to a second bearing abutting said one side of said sliding block.

4. an adjustment mechanism for adjusting a distance between an end of the accumulator spring and the inner wall of the movable body is further installed between the accumulator spring and the inner wall of the movable body; The adjustment mechanism includes: a spring ejector block having one end connected to an end of the accumulator spring and an opposite end fixedly connected to a first screw; a worm gear screwed onto the first screw; a worm screw hingedly connected to the movable body and meshing with the worm gear to drive the worm gear to rotate; 4. The door hinge according to claim 3, further comprising: a fixed block having a hollow cylindrical structure, installed on an inner wall of the end of the movable body, one end of the first screw passing through the inside, and an end face of the fixed block abutting against an end face of the worm gear.

5. 5. The door hinge according to claim 4, wherein one end of the worm screw penetrates the side wall of the movable body, and a buckle is provided at an outer end of the worm screw for limiting the displacement of the worm screw along its own length direction.

6. an adjustment mechanism for adjusting a distance between an end of the accumulator spring and the inner wall of the movable body is further installed between the accumulator spring and the inner wall of the movable body; The adjustment mechanism includes: a first slider that is slidably mounted within the movable body and is slidable along the extension and contraction direction of the self-closing mechanism, one end of which is connected to the self-closing mechanism and the other end of which has a first inclined surface; a second slider that is slidably mounted within the movable body, the sliding direction of which is perpendicular to the extension and contraction direction of the automatic closing mechanism, and the second inclined surface that is in contact with the first inclined surface is provided on a side surface of the second slider; 4. The door hinge according to claim 3, further comprising: a second screw screwed into a side wall of said movable body and having one end rotatably connected to one end of said second slider remote from said first slider.

7. A connection portion is provided at one end of the second screw; 7. The door hinge according to claim 6, wherein a position limiting groove for accommodating the connection portion is provided at one end of the second slider, and the connection portion is engaged within the position limiting groove and is rotatable around the axis of the second screw.

8. A through hole of the fixing body that accommodates the exposed portion of the second screw is provided on a side wall of the fixing body, 7. The door hinge according to claim 6, wherein a through hole of the movable body is provided on a side wall of the movable body, through which the end of the first slider slides.

9. A first guide groove is provided in the movable body, in which the first slider slides along the expansion and contraction direction of the accumulator spring, 7. The door hinge according to claim 6, wherein a second guide groove in which the second slider slides is provided within the movable body.

10. A buffer mechanism is further provided within the movable body to control the speed at which the door hinge closes, The buffer mechanism includes: an ejection plate removably connected to a side wall of the movable body; a damper having one end fixedly connected to the ejection plate and the other end being an expandable end; 2. The door hinge as described in claim 1, further comprising: a damping slider that is slidably mounted within the movable body, is slidable along the depth direction of the movable body, has one end abutting against the extension end of the damper, and has an ejection block protruding outward at the other end.

11. 11. The door hinge according to claim 10, wherein the movable body includes a movable base, a first fixed block of the movable base, and a second fixed block of the movable base, and a cavity is formed between the three to accommodate the sliding block, the automatic closing mechanism, and the buffer mechanism.

12. 11. The door hinge according to claim 10, wherein the fixed body includes a fixed base and a fixed block of the fixed base, and the fixed base and the fixed block of the fixed base are removably connected.

13. 13. The door hinge according to claim 12, wherein a projection is provided on the fixed block of the fixed base so as to face the ejection block.

14. The trajectory slope includes a first trajectory slope and a second trajectory slope arranged in sequence, and an included angle between the first trajectory slope and the trajectory plane is α １ and the included angle between the second trajectory slope and the trajectory plane is α ２ And α １ <α ２ 2. The door hinge of claim 1 ,

15. 9°≦α １ <45°, 24°≦α ２ 15. The door hinge of claim 14, wherein the angle is ≦45°.

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