Hidden door closer

Abstract

The utility model relates to the technical field of door closers, and discloses a hidden door closer which comprises a hollow sleeve, a connecting rod shaft is rotationally sleeved with the sleeve, the two ends of the connecting rod shaft extend to the upper side and the lower side of the sleeve, and end shafts are fixedly connected to the two ends of the connecting rod shaft. And the right sides of the outer surfaces of the two end shafts are jointly and fixedly connected with a second mounting blade, the left side of the outer surface of the sleeve is fixedly connected with a first mounting blade, and a torsion structure is arranged in the sleeve. The door closer can be installed at the hinged position of a door and a door frame through the arrangement of the first installation leaf and the second installation leaf, the installation position is not obvious, the door closer is smaller in structure, the overall attractiveness of the door and the door frame cannot be affected, and the door closer is not prone to falling off through pushing force of the spring and mutual extrusion of the movable rubber layer and the fixed rubber layer. The door is prevented from being directly and rapidly reset under the torsional force of the torsional spring 7 and violently colliding with the door frame, a certain protection effect on the door and the door frame is achieved, and the service life of the door and the door frame is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of door closers, in particular to a concealed door closer. Background Art

[0002] A door closer is used to open and close a door. When the door is opened, the door body drives the door closer's connecting rod to rotate, thereby opening the door. While the door is open, the spring inside the door closer is stressed. When the door is unobstructed, the spring returns to its original position under its elastic force, closing the door. However, existing door closers are large and their installation location is exposed and conspicuous, affecting the overall aesthetics of the door. Therefore, those skilled in the art have provided a concealed door closer to address the issues raised in the background art. Utility Model Content

[0003] The purpose of the present invention is to provide a concealed door closer to solve the problems raised in the above background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solutions:

[0005] A hidden door closer comprises a sleeve, which is hollow and has a connecting rod shaft rotatably sleeved inside. Both ends of the connecting rod shaft extend to the upper and lower sides of the sleeve, and both ends of the connecting rod shaft are fixedly connected to end shafts. The right sides of the outer surfaces of the two end shafts are commonly fixed with a second mounting leaf, and the left side of the outer surface of the sleeve is fixed with a first mounting leaf. The surfaces of the first mounting leaf and the second mounting leaf are both provided with mounting holes, and a torsion structure is provided inside the sleeve.

[0006] As a further solution of the present invention: the torsion structure includes a torsion spring, which is sleeved on the surface of the connecting rod shaft, and the two ends of the torsion spring are respectively fixed to the inner wall of the sleeve and the surface of the connecting rod shaft.

[0007] As a further solution of the present invention: an inner cavity is opened inside the end shafts, a fixed rubber layer is fixed to the inner surface of the inner cavity away from the sleeve, a spring is fixed to the inner surface of the inner cavity close to the sleeve, a movable rubber layer is fixed to the end of the spring close to the fixed rubber layer, the movable rubber layer and the fixed rubber layer are extruded, a steel cable is also fixed to the side of the movable rubber layer close to the spring, and the other end of the steel cable extends to the interior of the connecting rod shaft and extends from the side surface of the connecting rod shaft to be fixed to the inner wall of the sleeve.

[0008] As a further solution of the present invention: two torsion springs are provided, the spiral directions of the two torsion springs are the same, and one end of the steel cable extending from the side surface of the connecting rod shaft is located between the two torsion springs.

[0009] As a further solution of the present invention: a stopper is fixedly connected to the side surface of the connecting rod shaft, the stopper and one end of the steel cable extending out of the side surface of the connecting rod shaft are at the same horizontal height, and a groove for sliding of the steel cable is provided on the surface of the stopper facing the end of the steel cable.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] By providing the first and second mounting leaves, the door closer can be installed at the hinge of the door and the door frame. The installation position is not obvious, and the door closer structure is smaller, which will not affect the overall aesthetics of the door and the door frame. When the door is opened, the torsional force of the torsion spring can be utilized to enable the door to quickly reset after opening. The thrust of the spring and the mutual squeezing of the movable rubber layer and the fixed rubber layer are utilized, and the friction between the two is utilized to slow down the door before it is completely closed, thereby preventing the door from quickly resetting directly under the torsional force of the torsion spring 7 and violently colliding with the door frame. This provides a certain protection for the door and the door frame, and prolongs the service life of the door and the door frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural diagram of a concealed door closer;

[0013] Figure 2 The figure is a schematic diagram of the internal structure of a concealed door closer.

[0014] In the figure: 1. Sleeve; 2. End shaft; 3. First mounting leaf; 4. Second mounting leaf; 5. Mounting hole; 6. Connecting rod shaft; 7. Torsion spring; 8. Steel cable; 9. Stopper; 10. Inner cavity; 11. Spring; 12. Movable rubber layer; 13. Fixed rubber layer. DETAILED DESCRIPTION

[0015] See also Figures 1-2 In an embodiment of the present invention, a hidden door closer includes a sleeve 1. The sleeve 1 is hollow. A connecting rod shaft 6 is provided inside the sleeve 1 for rotation. Both ends of the connecting rod shaft 6 extend to the upper and lower sides of the sleeve 1. Both ends of the connecting rod shaft 6 are fixedly connected to an end shaft 2. The right side of the outer surface of the two end shafts 2 is commonly fixed with a second mounting leaf 4. The left side of the outer surface of the sleeve 1 is fixed with a first mounting leaf 3. The surfaces of the first mounting leaf 3 and the second mounting leaf 4 are both provided with mounting holes 5. A torsion structure is provided inside the sleeve 1.

[0016] Preferably, the torsion structure includes a torsion spring 7 , which is sleeved on the surface of the connecting rod shaft 6 , and two ends of the torsion spring 7 are respectively fixed to the inner wall of the sleeve 1 and the surface of the connecting rod shaft 6 .

[0017] Preferably, an inner cavity 10 is opened inside the end shaft 2, and a fixed rubber layer 13 is fixedly connected to the inner surface of the inner cavity 10 away from the sleeve 1, and a spring 11 is fixedly connected to the inner surface of the inner cavity 10 close to the sleeve 1, and a movable rubber layer 12 is fixedly connected to the end of the spring 11 close to the fixed rubber layer 13. The movable rubber layer 12 and the fixed rubber layer 13 are extruded and arranged, and a steel cable 8 is also fixed to the side of the movable rubber layer 12 close to the spring 11, and the other end of the steel cable 8 extends to the interior of the connecting rod shaft 6 and extends from the side surface of the connecting rod shaft 6 to be fixed to the inner wall of the sleeve 1.

[0018] Preferably, two torsion springs 7 are provided, the spiral directions of the two torsion springs 7 are the same, and one end of the steel cable 8 extending out of the side surface of the connecting rod shaft 6 is located between the two torsion springs 7 .

[0019] Preferably, a stopper 9 is fixed to the side surface of the connecting rod shaft 6, and the stopper 9 and one end of the steel cable 8 extending out of the side surface of the connecting rod shaft 6 are at the same horizontal height, and a groove for sliding of the steel cable 8 is provided on the surface of the stopper 9 facing the end of the steel cable 8.

[0020] The working principle of the present invention is as follows: when using the hidden door closer, the door and the door frame are first connected by screws or bolts through the mounting holes 5 on the surfaces of the first mounting leaf 3 and the second mounting leaf 4. When the door is opened, the angle between the planes where the first mounting leaf 3 and the second mounting leaf 4 are located becomes smaller. At this time, the torsion spring 7 generates a certain torsional force, forcing the door to reset. At the same time, under the traction of the steel cable 8, the movable rubber layer 12 and the fixed rubber layer 13 gradually change from the squeezed state to the separated state, and the spring 11 will be compressed. After the door is released, the torsional force of the torsion spring 7 forces the door to reset quickly. After resetting to a certain extent, and under the elastic force of the spring 11, the movable rubber layer 12 and the fixed rubber layer 13 change from the separated state to the contact state, and then from the contact state to the squeezed state. In this process, due to the friction between the movable rubber layer 12 and the fixed rubber layer 13, the door is decelerated before it is fully closed, preventing the door from quickly resetting directly under the torsional force of the torsion spring 7 and violently colliding with the door frame, thereby playing a certain protective role for the door and the door frame.

[0021] The above is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited to this. Any technician familiar with the technical field within the technical scope disclosed by the present invention can make equivalent replacements or changes based on the technical solution and utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concealed door closer, comprising a sleeve (1), characterized in that: The sleeve (1) is hollow, and a connecting rod shaft (6) is rotatably sleeved inside the sleeve (1). Both ends of the connecting rod shaft (6) extend to the upper and lower sides of the sleeve (1). Both ends of the connecting rod shaft (6) are fixedly connected to end shafts (2). The right sides of the outer surfaces of the two end shafts (2) are commonly fixedly connected to a second mounting leaf (4). The left side of the outer surface of the sleeve (1) is fixedly connected to a first mounting leaf (3). The surfaces of the first mounting leaf (3) and the second mounting leaf (4) are both provided with mounting holes (5). A torsion structure is provided inside the sleeve (1).

2. A concealed door closer according to claim 1, characterized in that: The torsion structure comprises a torsion spring (7), which is sleeved on the surface of the connecting rod shaft (6), and two ends of the torsion spring (7) are respectively fixed to the inner wall of the sleeve (1) and the surface of the connecting rod shaft (6).

3. The concealed door closer according to claim 2, characterized in that: The end shafts (2) are each provided with an inner cavity (10), the inner surface of the inner cavity (10) away from the sleeve (1) is fixedly connected to a fixed rubber layer (13), the inner cavity (10) is fixedly connected to the inner surface of the sleeve (1) close to the spring (1), the end of the spring (11) close to the fixed rubber layer (13) is fixedly connected to a movable rubber layer (12), the movable rubber layer (12) and the fixed rubber layer (13) are extruded, the movable rubber layer (12) is also fixedly connected to a steel cable (8) on one side close to the spring (11), and the other end of the steel cable (8) extends into the interior of the connecting rod shaft (6) and extends from the side surface of the connecting rod shaft (6) to be fixed to the inner wall of the sleeve (1).

4. The concealed door closer according to claim 3, characterized in that: Two torsion springs (7) are provided, and the spiral directions of the two torsion springs (7) are the same. One end of the steel cable (8) extending out of the side surface of the connecting rod shaft (6) is located between the two torsion springs (7).

5. The concealed door closer according to claim 4, characterized in that: A stopper (9) is fixedly connected to the side surface of the connecting rod shaft (6), and the stopper (9) and an end of the steel cable (8) extending out of the side surface of the connecting rod shaft (6) are located at the same horizontal height. A groove for sliding the steel cable (8) is provided on the surface of the stopper (9) facing the end of the steel cable (8).

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