Door closers

Abstract

The present invention relates to the technical field of door hardware, and discloses a door closer comprising a fixed assembly and a movable assembly, wherein the fixed assembly comprises a mounting seat, a limit block, and a pin, and the movable assembly comprises a base, a slider, and a spring, wherein the limit block is inserted into the mounting seat, the base is hinged on the pin in the limit block, and the slider abuts against the limit block under the elastic force of the spring. During use, the cooperation between the slider, the spring, and the limit block enables the rotation of the movable assembly to be achieved with a relatively small structure, thereby achieving automatic closing of the door. Since the door closer has relatively few components, and each component can achieve the above-mentioned functions with a relatively small size, the overall volume of the door closer can be reduced, making it easier to transport and install on door frames and door leaves.

Description

Technical Field

[0001] The present invention relates to the technical field of door hardware, and in particular to a door closer. Background Art

[0002] Traditional door closers are usually hydraulic door closers, which have the problems of being large in size, high in cost, complex in adjusting the door closing force, and prone to oil leakage. Summary of the Invention

[0003] The present invention is made to solve the above technical problems, and its purpose is to provide a door closer with a simple structure, a small size and the ability to automatically close the door.

[0004] To achieve the above-mentioned object, the present invention provides a door closer, comprising a fixed assembly and a movable assembly, wherein the fixed assembly comprises: a mounting seat, provided on a door frame, having a mounting groove on one side with upper and lower groove walls having first mounting holes facing each other; a limit block, one end of which is inserted into the mounting groove, a middle portion of which is provided with a third mounting hole facing the first mounting hole, and a side surface of the other end of which is a contact surface; a pin, which is inserted into the first and third mounting holes and is concentric with the rotation axis of the door leaf;

[0005] The moving component includes: a base, which is provided on the door leaf and one end of which is hinged on the pin shaft; a slider, which is slidably provided in the base and can slide along the length direction of the base; a spring, which is provided in the base and applies elastic force to the slider so that the slider abuts against the contact surface; wherein, the opening angle of the door leaf is θ, when 0<θ≤α or θ>β, the direction of the force between the slider and the limit block deviates from the pin shaft, and the force can drive the door leaf to close, and the α and β are any values ​​within the range of 0-180°, and α≤β.

[0006] Preferably, a circular arc surface concentric with the pin shaft is provided in the middle of the contact surface; a first circular arc-shaped transition surface is provided between the end face of the slider close to the limit block and the side face of the slider close to the door frame; when α<θ≤β, the first transition surface abuts against the circular arc surface, the direction of the force between the slider and the limit block passes through the axis of the pin shaft, and α<β.

[0007] Preferably, a fixing surface is provided on the side of the contact surface close to the opening side of the door leaf, and the angle between the fixing surface and the door frame is less than 90°; an arc-shaped second transition surface is provided between the fixing surface and the arc surface; and an arc-shaped third transition surface is provided between the end face of the slider close to the limit block and the side face of the slider away from the door frame.

[0008] Preferably, the first mounting hole is an elongated hole perpendicular to the door frame; the door closer further comprises a fastener for fixing the limiting block and the mounting seat together.

[0009] Preferably, a second elongated mounting hole parallel to the first mounting hole is provided on one side wall of the mounting groove, and a elongated limiting groove facing the second mounting hole is provided on the other side wall of the groove; a threaded hole facing the second mounting hole is provided on the limiting block; and the fastener is a first screw inserted into the threaded hole.

[0010] Preferably, the base is further provided with an adjusting member for adjusting the elastic force of the spring.

[0011] Preferably, a sliding groove is provided in the base along the length direction for the sliding block to slide, and a spring seat is also slidably provided in the sliding groove. The spring is a compression spring with two ends respectively connected to the sliding block and the spring seat. The adjusting member is a second screw threadedly connected to the end wall of the sliding groove away from the sliding block, and the front end of the second screw abuts against the spring seat.

[0012] Preferably, it also includes a buffer assembly arranged in the base, and the buffer assembly includes: a limit seat, fixed in the base, and provided with a buffer hole facing the mounting seat on one side; a rocker arm, one end of which is hinged to the end of the limit seat close to the buffer hole; a damper, arranged in the limit seat, one end of which is connected to the end of the limit seat away from the buffer hole; a sliding arm, one end of which is hinged to the other end of the rocker arm, and the other end abuts the other end of the damper; wherein, the damper can apply a force toward one side of the rocker arm to the sliding arm when under pressure, and when the door leaf is opened, the connection between the rocker arm and the sliding arm is located outside the buffer hole, and when 0<θ≤γ, the connection between the rocker arm and the sliding arm abuts on the mounting seat, and γ is any value less than 45° and greater than 0.

[0013] Preferably, a sliding seat is provided in the limit seat, and two dampers are provided in the sliding seat; the tail end of one of the dampers abuts against the end face of the limit seat, and the front end abuts against the front end face of the sliding seat; the front end of the other damper abuts against the sliding arm, and the tail end abuts against the tail end face of the sliding seat.

[0014] Preferably, the side wall of the slider is provided with a limiting pit, and the side wall of the base is provided with a limiting hole; in the initial state, a limiting pin is passed through the limiting hole and the limiting pit, and fixes the slider in the base.

[0015] As can be seen from the above description and practice, the door closer of the present invention comprises a movable assembly and a fixed assembly. During use, the cooperation between the slider, spring, and stop block enables rotation of the movable assembly, thereby automatically closing the door, with minimal structural effort. Because the door closer comprises relatively few components, each of which can achieve the aforementioned functions with a relatively small size, the overall size of the door closer can be reduced, making it easier to transport and install on door frames and door leaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the use of a door closer involved in one embodiment of the present invention.

[0017] Figure 2a-2d They are schematic diagrams of the three-dimensional cross-sectional structure of a door closer involved in one embodiment of the present invention when the door leaf opening and closing angles are 0°, 30°, 90° and 150° respectively.

[0018] Figure 3a and Figure 3b They are schematic diagrams of the horizontal cross-sectional structure of a door closer involved in an embodiment of the present invention when the door leaf opening and closing angles are 0° and 90° respectively.

[0019] Figure 4 Schematic diagram of the horizontal cross-section structure of the moving component of the door closer in an initial state involved in one embodiment of the present invention.

[0020] Figure 5a and Figure 5b Schematic diagram of the vertical cross-sectional structure of the buffer assembly of the door closer involved in one embodiment of the present invention under different stress states.

[0021] Figure 6 The figure is a schematic diagram of the exploded structure of a fixing component in a door closer according to an embodiment of the present invention.

[0022] Figure 7a and Figure 7b Schematic diagram of the exploded structure of the moving component of the door closer involved in one embodiment of the present invention from two different perspectives.

[0023] Figure 8 Schematic diagram of the structure of a base in a door closer according to an embodiment of the present invention.

[0024] The reference numerals in the figures are:

[0025] 1. Fixed assembly; 11. Mounting seat; 12. Stop block; 13. Pin; 14. Mounting slot; 15. Contact surface; 16. U-shaped slot; 17. Reinforcement plate; 2. Moving assembly; 21. Base; 22. Slider; 23. Spring; 24. Slide; 25. Spring seat; 26. Recessed portion; 27. Base cover; 28. Strip groove; 29. ​​Card table; 3. Buffer assembly; 31. Stop seat; 32. Rocker arm; 33. Damping Device; 34. Sliding arm; 35. Buffer hole; 36. Sliding seat; 41. Door leaf; 42. Door frame; 51. First mounting hole; 52. Second mounting hole; 53. Third mounting hole; 54. Limiting groove; 61. First transition surface; 62. Second transition surface; 63. Third transition surface; 64. Arc surface; 65. Fixing surface; 71. First screw; 72. Second screw; 81. Limiting pit; 82. Limiting hole; 83. Limiting pin. DETAILED DESCRIPTION

[0026] The exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments can be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concepts of the exemplary embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0027] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. It should be noted that in the present disclosure, the terms "including", "configured with", and "set on" are used to express open-ended inclusion and mean that in addition to the listed elements / components / etc., there may be additional elements / components / etc.; the terms "first", "second", etc. are used only as labels and are not intended to limit the number or order of their objects; the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore should not be understood as limiting the present invention.

[0028] Unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0029] In this embodiment, a door closer is disclosed. Figure 1 The three-dimensional structure of the door closer in use is shown; Figure 2a-2d The three-dimensional cross-sectional structures of the door closer are shown respectively when the door leaf opening and closing angles are 0°, 30°, 90°, and 150°; Figure 3a and Figure 3b The horizontal cross-sectional structures of the door closer are shown when the door leaf opening and closing angles are 0° and 90° respectively. Figure 4 The horizontal cross-sectional structure of the moving assembly of the door closer in the initial state is shown;

[0030] Please refer to Figures 1 to 4 The door closer in this embodiment includes a fixed component 1 provided on a door frame 42 and a movable component 2 provided on a door leaf 41, which are rotatably connected together, wherein the movable component 2 can rotate synchronously with the door leaf 41, and the interaction force between the movable component 2 and the fixed component 1 at a preset position can cause the door leaf 41 to close automatically.

[0031] Specifically, the fixing assembly 1 includes a mounting seat 11 , a limiting block 12 and a pin 13 . Figure 6 The exploded structure of the fixing assembly 1 is shown, in which the limit block 12 is separated from the mounting base 11. The mounting base 11 is fixedly mounted on the side of the door frame 42, and its main body is a plate structure, which is convenient for installation on the door frame 42 by screws. A mounting groove 14 is provided on the left side of the mounting base 11, and two groove walls of the mounting groove 14 are provided with first mounting holes 51 facing each other for installing the limit block 12. After the assembly is completed, one end of the limit block 12 is inserted into the mounting groove 14, and a third mounting hole 53 facing the first mounting hole 51 is provided in the middle, and the side surface of the other end is a contact surface 15. The pin shaft 13 is passed through the first mounting hole 51 and the third mounting hole 53, and is concentric with the rotation axis of the door leaf 41, connecting the limit block 12 and the mounting base 11 together.

[0032] Figure 7a and Figure 7b The exploded structure of the moving assembly 2 at two different viewing angles is shown. In this embodiment, the moving assembly 2 includes a base 21 , a slider 22 and a spring 23 . Figure 8The three-dimensional structure of the base 21 is shown. The base 21 has an elongated slot structure as a whole. The open side faces the door frame 42 when in use, and one end is hinged on the pin 13 to achieve a rotational connection with the fixed assembly 1. The slider 22 is slidably arranged in the base 21 and can slide along the length of the base 21. The spring 23 is also arranged in the base 21, applying a force toward the limit block 12 to the slider 22, so that the slider 22 abuts against the contact surface 15. Specifically, in this embodiment, a slide groove 24 is provided in the base 21 along the length direction for the slider 22 to slide. The spring 23 is arranged inside the slide groove 24 and is in a compressed state. One end of the spring abuts against the slider 22, thereby pushing the slider 22 to move toward the outer end of the slide groove 24, even if it abuts against the contact surface 15. In other embodiments, a slide rail or other structure can also be provided between the slider 22 and the base 21 to achieve a sliding connection between the two.

[0033] In addition, in this embodiment, the angle of the door leaf 41 is θ. When 0<θ≤α or θ>β, the direction of the force between the slider 22 and the limit block 12 deviates from the pin 13, and the force can drive the door leaf 41 to close, wherein α and β are any values ​​within the range of 0-180°, and α≤β. Figure 2b For example, when the door leaf 41 is opened to an angle of 30° and less than α, the direction of the force between the slider 22 and the stopper 12 is located below the pin 13. This force is derived from the elastic force of the spring 23. Because the base 21 is rotatably connected to the pin 13, this force can generate a torque that rotates the base 21 counterclockwise about the pin 13, ultimately closing the door. When the door leaf 41 is opened at other angles within the range of 0 < θ ≤ α and θ > β, the principle of closing the door leaf 41 is the same as when the angle is 30°.

[0034] The door closer of this embodiment utilizes a relatively simple structure to achieve rotation of the movable assembly 2 and thus automatically close the door through the cooperation between the slider 22, the spring 23, and the stopper 12. Because the door closer has relatively few components, and each component can achieve the above functions with a relatively small size, the overall size of the door closer can be reduced, making it easier to transport and install on the door frame 42 and door leaf 41.

[0035] In this embodiment, a specific shape of the slider 22 and the stop block 12 is provided to realize the function of automatically closing the door leaf 41 under the above-mentioned opening and closing angle of the door leaf 41. Specifically, the front end surface of the slider 22 (the end surface close to the stop block 12) is a plane, the sliding direction of the slider 22 deviates from the pin 13, and the contact surface 15 of the stop block 12 includes a plane and an arc surface. Figure 6 In the embodiment, the contact surface 15 is a plane, a curved surface and a plane in sequence from the right side to the left side. This structural form can realize the automatic closing function of the door leaf 41 within the opening and closing angle of the door leaf 41.

[0036] It should be noted that the direction of the force between the slider 22 and the limit block 12 is perpendicular to the cross-section of the abutment position of the two and passes through the contact point. Therefore, changing the shape of the contact surface 15 of the limit block 12, changing the shape of the front end of the slider 22, or changing the sliding direction of the slider 22 can change the direction of the force between the slider 22 and the limit block 12. Therefore, based on this principle, the specific shape of the slider 22 and the limit block 12 in the door closer and the sliding direction of the slider 22 can also be changed according to actual needs. It is only necessary to ensure that when the opening angle of the door leaf 41 is 0<θ≤α and θ>β, the direction of the force between the slider 22 and the limit block 12 is located at Figure 2b The lower side of the middle pin shaft 13 can be used, and the function of automatically closing the door leaf 41 can also be achieved.

[0037] In addition, in this embodiment, the door closer also has an arbitrary stopping area within a certain angular range, that is, when the opening and closing angle of the door leaf 41 is α<θ≤β, and α<β, the direction of the force acting on the slider 22 and the limit block 12 passes through the axis of the pin 13. At this time, the force will not drive the moving component 2 to rotate. Accordingly, the door leaf 41 can be stationary within this angular range. Specifically, a circular arc surface 64 concentric with the pin 13 is provided in the middle of the contact surface 15, and a first circular arc transition surface 61 is provided between the front end surface of the slider 22 and the side surface of the slider 22 close to the door frame 42. When α<θ≤β, the first transition surface 61 abuts against the circular arc surface 64. Because the tangent plane of the two circular arc surfaces when they contact is perpendicular to the line connecting the contact point and the center of the circle, within this opening and closing angle range, the direction of the force acting on the slider 22 and the limit block 12 can always pass through the axis of the pin 13.

[0038] Furthermore, in this embodiment, α = 90° and β = 130°, so when the door leaf 41 is opened at an angle between 90° and 130°, it can remain in a stationary state if not disturbed by external forces. In other embodiments, the specific values ​​of α and β can be changed by changing the position or size range of the arc surface 64 in the middle of the contact surface 15.

[0039] In addition, on the side of the contact surface 15 close to the open side of the door leaf 41 (i.e. Figure 2b and Figure 6A fixed surface 65 is provided (on the right side in the figure), and the angle between the fixed surface 65 and the door frame 42 is less than 90°. A second curved transition surface 62 is provided between the fixed surface 65 and the arcuate surface 64, and a third curved transition surface 63 is provided between the front end surface of the slider 22 and the side of the slider 22 away from the door frame 42. In this structural form, when the door leaf 41 is close to closing and when it is closed, the force between the stop block 12 and the slider 22 is directed toward the door frame 42, which can keep the door leaf 41 in a relatively stable closed state. By providing the second transition surface 62 and the third transition surface 63, when the door leaf 41 opens, the slider 22 can more easily move from the fixed surface 65 to the arcuate surface 64, making it smoother for the user to push the door open.

[0040] Furthermore, in this embodiment, the first mounting hole 51 is an elongated hole perpendicular to the door frame 42. The door closer also includes a fastener that securely connects the stopper 12 to the mounting base 11. By moving the pin 13 on the stopper 12 within the elongated hole, the pin 13 is aligned with the rotation axis of the door leaf 41, facilitating precise and convenient installation of the door closer. Once the pin 13 is positioned, the fastener secures the stopper 12 to the mounting base 11.

[0041] like Figure 6 As shown, a second, elongated mounting hole 52 parallel to the first mounting hole 51 is provided on the outer wall of the mounting groove 14, a limiting groove 54 facing the second mounting hole 52 and also having an elongated shape is provided on the inner wall of the mounting groove, and a threaded hole facing the second mounting hole 52 is provided on the limiting block 12. The fastener is a first screw 71 inserted into the threaded hole. After the pin 13 is positioned, the first screw 71 is tightened in the threaded hole to tighten the limiting block 12 against the wall of the mounting groove 14. The elongated second mounting hole 52 and limiting groove 54 allow the user to move the limiting block 12 along the length of the second mounting hole 52 after loosening the first screw 71, making it easier for the user to adjust the position of the limiting block 12. The above describes a specific structural form of the fastener. In other embodiments, fasteners with structural forms such as pins and buckles can also be used to achieve the connection between the limiting block 12 and the mounting base 11.

[0042] In addition, in this embodiment, an adjusting member capable of adjusting the elastic force of the spring 23 is also provided on the base 21. Figure 3a 、 Figure 4 、 Figure 7a and Figure 7bThis embodiment provides a specific structure of an adjusting member, specifically comprising a second screw 72 and a spring seat 25. The spring seat 25, similar to the slider 22, slides within the chute 24. The spring 23 is positioned between the spring seat 25 and the slider 22, with its ends abutting against the spring seat 25 and the slider 22, respectively. The second screw 72 is threadedly connected to the end wall of the chute 24, away from the slider 22, with its front end abutting against the spring seat 25. By rotating the second screw 72, the position of the spring seat 25 within the chute 24 can be adjusted, thereby adjusting the degree of compression of the spring 23 and adjusting the force of the spring 23. Furthermore, in this embodiment, the spring 23 is a compression spring, so the elastic force of the spring 23 can be adjusted by moving the spring seat 25. In other embodiments, other structures that can slide on the base 21 can also be used as the adjusting member to similarly control the degree of compression of the spring 23. Furthermore, if the spring 23 is a torsion spring, the corresponding adjustment member can also be a structure that can rotate on the base 21 to control the compression degree of the torsion spring, thereby also adjusting the self-closing force of the door leaf 41. Furthermore, the slider 22 and the spring seat 25 are provided with opposing recessed portions 26 capable of accommodating the spring 23. The recessed portions 26 are cylindrical in shape, which can improve the stability of the spring 23 and prevent it from undergoing significant radial deformation.

[0043] In addition, the door closer in this embodiment further includes a buffer assembly 3, which is used to reduce the speed of the door leaf 41 when the door leaf 41 approaches the door frame 42 during the door closing process, so that the door leaf 41 can be closed smoothly.

[0044] Please combine Figure 7a and Figure 7b The buffer assembly 3 comprises a stopper 31, a rocker arm 32, a damper 33, and a slide arm 34. The stopper 31 is also a long, strip-shaped trough, located on the side of the base 21 near the door frame 42. A cavity is formed between the stopper 31 to accommodate the rocker arm 32, the slide arm 34, and the damper 33. A buffer hole 35 is provided on one side of the stopper 31, facing the mounting seat 11 on the door frame 42. During use, the moving assembly 2 and the buffer assembly 3 can be mounted on the door leaf 41 by passing a long screw through the base 21 and the stopper 31. One end of the rocker arm 32 is hinged to one end of the limit seat 31 near the buffer hole 35, and the other end is hinged to one end of the sliding arm 34; the other end of the sliding arm 34 is slidably arranged in the limit seat 31, and the end portion abuts against one end of the damper 33; the other end of the damper 33 abuts against the inner wall of the limit seat 31. When the damper 33 is pressurized, it can apply a force to the sliding arm 34 toward the side of the rocker arm 32.

[0045] Specifically, when the door 41 is open, the connection between the rocker arm 32 and the slide arm 34 is located outside the buffer hole 35. When 0 < θ ≤ γ, the connection between the rocker arm 32 and the slide arm 34 abuts the mounting seat 11. As the door 41 further closes, the mounting seat 11 pushes the slide arm 34 into the stop seat 31, which in turn compresses the damper 33. The resistance generated by the pressure on the damper 33 reduces the closing speed of the door 41, thus providing a buffering effect. γ is any value less than 45° and greater than 0. The specific value can be set by the user according to actual needs. This value can be adjusted by adjusting the length of the connection between the rocker arm 32 and the slide arm 34 outside the buffer hole 35. A larger length increases the rocker arm 32's contact with the mounting seat 11 earlier during the closing process, i.e., a larger γ increases the length. In this embodiment, γ is 20°. When the door 41 closes at this angle, the buffer assembly 3 intervenes, gradually reducing the closing speed of the door 41.

[0046] Figure 5a and Figure 5b The vertical cross-sectional structures of the door closer's buffer assembly 3 under different stress states are shown, wherein the position of the slide 36 moves left and right as the damper 33 is pressed. Figure 5a 、 Figure 5b 、 Figure 7a and Figure 7b In this embodiment, a slide 36 slides within the limit seat 31, and two dampers 33 are mounted on the slide 36. The overall structure of the slide 36 is U-shaped. The tail end (the end away from the slide arm 34) of one damper 33 passes through the slide 36 and abuts against the end surface of the limit seat 31, while the front end abuts against the front end surface of the slide 36. The front end of the other damper 33 passes through the slide 36 and abuts against the slide arm 34, while the tail end abuts against the rear end surface of the slide 36. This structural form allows the two dampers 33 to be connected in series within a relatively short length, which can ensure the buffering effect while reducing the volume of the buffer assembly 3.

[0047] In addition, the door closer is also provided with a structure capable of limiting the position of the slider 22. Figure 4 、 Figure 7a and Figure 7b The sidewalls of the slider 22 are provided with a retaining recess 81, and the sidewalls of the base 21 are provided with a retaining hole 82. Initially, a retaining pin 83 is inserted into the retaining hole 82 and retaining recess 81, securing the slider 22 within the base 21. This structure ensures that the slider 22 of the movable assembly 2 is locked when it leaves the factory, preventing it from being ejected by the spring 23. This also prevents workers from being pinched by the slider 22 and retaining block 12 during installation of the movable assembly 2. After the fixed assembly 1 and movable assembly 2 are positioned and installed, the retaining pin 83 is removed, and the slider 22 can resume normal operation.

[0048] Also, please refer to Figure 3a and Figure 6 The stop block 12 is provided with a U-shaped groove 16 facing the mounting groove 14, and a reinforcing plate 17 is provided in the mounting groove 14, which can be snapped into the U-shaped groove 16. The cooperation between the reinforcing plate 17 and the U-shaped groove 16 can improve the stability of the stop block 12 in the mounting groove 14, especially preventing the stop block 12 from rotating about the pin 13 when the slider 22 pushes the stop block 12, thereby ensuring the stable operation of the door closer.

[0049] In this embodiment, the mounting base 11 is fixed to the door frame 42 via screws, and the base 21 is also screwed to the door leaf 41. Furthermore, strip-shaped grooves 28 are provided at the upper and lower ends of the opening side of the base 21. The front end of the U-shaped base cover 27 is provided with a latch 29 that faces the strip-shaped grooves 28. The base cover 27 fits over the outer periphery of the base 21 and snaps into place with it, concealing the various components of the moving assembly 2 and simplifying the appearance of the door closer. The base cover 27 also has holes for the mounting screws of the base 21 and for a second screw 72 to pass through, facilitating mounting the base 21 to the door leaf 41 and rotating the second screw 72, respectively.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A door closer, characterized in that: Including fixed components and moving components, The fixing assembly includes: The mounting seat is provided on the door frame, and one side is provided with a mounting groove with upper and lower groove walls having first mounting holes facing each other; A limit block, one end of which is inserted into the mounting groove, a third mounting hole is provided in the middle thereof facing the first mounting hole, and a side surface of the other end is a contact surface; A pin is inserted into the first mounting hole and the third mounting hole and is concentric with the rotation axis of the door leaf; The mobile component includes: A base is provided on the door leaf, one end of which is hinged to the pin; A slider, slidably disposed in the base and capable of sliding along the length direction of the base; a spring, disposed in the base, for applying elastic force to the slider to cause the slider to abut against the contact surface; The door leaf is opened at an angle θ. When 0<θ≤α or θ>β, the direction of the force between the slider and the limit block deviates from the pin, and the force can drive the door leaf to close. α and β are any values ​​within the range of 0-180°, and α≤β; A buffer component is provided in the base, and the buffer component includes: A limit seat is fixed in the base and has a buffer hole on one side facing the mounting seat; A rocker arm, one end of which is hinged to an end of the limit seat close to the buffer hole; A damper is provided in the limit seat, one end of which is connected to an end of the limit seat away from the buffer hole; a sliding arm, one end of which is hinged to the other end of the rocker arm and the other end of which abuts against the other end of the damper; Wherein, the damper can apply a force to the sliding arm toward one side of the rocker arm when under pressure, and when the door leaf is opened, the connection between the rocker arm and the sliding arm is located outside the buffer hole, and when 0<θ≤γ, the connection between the rocker arm and the sliding arm abuts against the mounting seat, and γ is any value less than 45° and greater than 0; A sliding seat is provided in the limit seat for sliding movement, and two dampers are provided in the sliding seat. The tail end of one damper abuts against the end face of the limit seat, and the front end abuts against the front end face of the sliding seat, and the front end of the other damper abuts against the sliding arm, and the tail end abuts against the tail end face of the sliding seat.

2. The door closer according to claim 1, wherein: The middle part of the contact surface is provided with an arc surface concentric with the pin shaft; A first arc-shaped transition surface is provided between the end surface of the slider close to the limit block and the side surface of the slider close to the door frame; When α<θ≤β, the first transition surface abuts against the arc surface, the direction of the acting force between the slider and the limit block passes through the axis of the pin, and α<β.

3. The door closer according to claim 2, wherein: A fixing surface is provided on a side of the contact surface close to the opening side of the door leaf, and an angle between the fixing surface and the door frame is less than 90°; An arc-shaped second transition surface is provided between the fixing surface and the arc surface; An arc-shaped third transition surface is provided between the end surface of the sliding block close to the limiting block and the side surface of the sliding block away from the door frame.

4. The door closer according to claim 1, wherein: The first mounting hole is a long hole perpendicular to the door frame; The door closer further comprises a fastener for fixing the limit block and the mounting seat together.

5. The door closer according to claim 4, wherein: A second elongated mounting hole parallel to the first mounting hole is provided on one side of the mounting slot wall, and a elongated limiting groove facing the second mounting hole is provided on the other side of the slot wall; The limiting block is provided with a threaded hole facing the second mounting hole; The fastener is a first screw inserted into the threaded hole.

6. The door closer according to claim 1, wherein: The base is also provided with an adjusting piece for adjusting the elastic force of the spring.

7. The door closer according to claim 6, wherein: A sliding groove is provided in the base along the length direction for the sliding block to slide, and a spring seat is also slidably provided in the sliding groove. The spring is a compression spring with two ends respectively connected to the sliding block and the spring seat. The adjusting member is a second screw threadedly connected to the end wall of the sliding groove away from the sliding block, and the front end of the second screw abuts against the spring seat.

8. The door closer according to any one of claims 1 to 7, characterized in that The side wall of the slider is provided with a limiting pit, and the side wall of the base is provided with a limiting hole; In the initial state, the limiting pin is inserted into the limiting hole and the limiting pit, and fixes the slider in the base.

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