Door closer with large door opening angle

Abstract

The door closer with the large door opening angle comprises a shell, a spring, a cam shaft, a piston, a first idler wheel and a second idler wheel, the spring, the cam shaft and the piston are all located in the shell, the two ends of the cam shaft penetrate through the piston and then stretch out of the shell, and the first idler wheel and the second idler wheel are both installed on the piston and located on the two opposite sides of the cam shaft. One end of the spring abuts against the inner wall of the shell, the other end of the spring abuts against the piston, and the piston is of an integrally-formed structure. By means of the integrally-formed structure of the piston, when the cam shaft rotates and pushes the piston to move, the piston can integrally move, only a reset spring needs to be installed on one side, a spring does not need to be installed on the other side of the piston, and therefore the structure of the whole door closer can be simplified, and the requirement for the installation space in the whole shell is reduced; the size of the whole shell is reduced, and the door closer is convenient to install.

Description

Technical Field

[0001] The utility model belongs to a door closer, in particular to a door closer with a large opening angle. Background Art

[0002] Basically, only one cam is installed on the camshaft of the existing door closer. Through the interaction between the cam and the roller on the door closer, the positioning functions such as opening and closing of the door are completed. And the piston on the door closer adopts a split mode. When the camshaft acts on the piston, in order to maintain the consistency of the movement of the split piston, springs are installed on both sides of the piston. Through the action of the springs, the roller on the piston is always in close contact with the cam on the camshaft. For example, a door closer disclosed in the patent application No. 201180031543.4. The required space inside the housing of this type of door closer is relatively large, resulting in a relatively large volume of the entire door closer, which is not conducive to installation. Content of the Utility Model

[0003] The purpose of the utility model is to provide a door closer with a large opening angle that can solve at least one of the above problems.

[0004] According to one aspect of the utility model, there is provided a door closer with a large opening angle, including a housing, a spring, a camshaft, a piston, a first roller and a second roller. The spring, the camshaft and the piston are all located inside the housing. The two ends of the camshaft penetrate through the piston and then extend out of the housing. The first roller and the second roller are both installed on the piston and are located on the opposite sides of the camshaft. One end of the spring abuts against the inner wall of the housing, and the other end abuts against the piston. The piston is an integrally formed structure.

[0005] The beneficial effect of the utility model is that: due to the integrally formed structure of the piston, when the camshaft rotates to push the piston to move, the piston can move as a whole, and only a reset spring needs to be installed on one side, while no spring needs to be installed on the other side of the piston. Therefore, it is beneficial to simplify the structure of the entire door closer, reduce the installation space requirement inside the entire housing, reduce the volume of the entire housing, and facilitate the installation of the door closer.

[0006] In some embodiments, the piston is provided with an installation groove, and the camshaft penetrates through the installation groove and then extends out. The first roller and the second roller are respectively located on the opposite sides of the installation groove. Thus, by providing the installation groove, the installation of the first roller and the second roller can be facilitated.

[0007] In some embodiments, the camshaft includes a rotating shaft, a first cam, and a second cam. The first cam and the second cam are both disposed on the rotating shaft and are integrally formed with the rotating shaft. The first cam abuts against the first roller, and the second cam abuts against the second roller. The second roller is close to the spring side. Thus, by providing the first cam and the second cam on the rotating shaft and the first protrusion and the second protrusion are distributed in a staggered manner, when the second cam rotates more than 90°, the first cam can always keep in contact with the corresponding roller on the door closer, preventing the second cam from rotating back, which is beneficial to increasing the rotation angle of the second cam, that is, beneficial to the second cam acting on the roller for the other opening function, thereby increasing the opening angle and meeting the corresponding use requirements.

[0008] In some embodiments, the first cam is located above the second cam. A first protrusion is provided on one side of the first cam, and a second protrusion is provided on one side of the second cam. The first protrusion and the second protrusion are distributed in a staggered manner.

[0009] In some embodiments, a limiting groove is provided on the other side of the first cam, and a groove is provided on the other side of the second cam. The limiting groove can cooperate with the first roller, and the groove can cooperate with the second roller. Thus, through the limiting groove on the first cam, the rotating shaft can cooperate with the first roller when closing the door to achieve positioning.

[0010] In some embodiments, the limiting groove and the groove are flush, and the axis of the second cam and the axis of the rotating shaft are on the same straight line. Thus, by the axes of the two being on the same straight line, when the door is opened to the maximum angle, opening positioning is achieved.

[0011] In some embodiments, the limiting groove and the groove are distributed in a staggered manner, and the axis of the second cam is on one side of the axis of the rotating shaft. Thus, the axes of the two are not on the same straight line, and when the door is opened to the maximum angle, the door can automatically return to the closed state.

[0012] In some embodiments, there are two first cams, which are respectively located at the upper and lower ends of the second cam, and there are two first rollers corresponding to the first cams. Thus, the smoothness of the rotation of the entire rotating shaft is improved, which is beneficial to improving the load-bearing capacity.

[0013] In some embodiments, for the arcs on both sides between the second protrusion and the groove in the second cam, the arc length on one side is greater than the arc length on the other side. Thus, the opening angle can be increased accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of a door closer with a large opening angle of the present invention.

[0015] Figure 2 is Figure 1Schematic cross-sectional structure diagram.

[0016] Figure 3 It is a schematic diagram of the internal structure of the housing in a door closer with a large door opening angle of the present utility model.

[0017] Figure 4 It is a schematic diagram of one embodiment of the camshaft of a door closer with a large door opening angle of the present utility model having two first cams.

[0018] Figure 5 It is Figure 4 Schematic diagram of another angle.

[0019] Figure 6 It is a schematic diagram of another embodiment of the camshaft of a door closer with a large door opening angle of the present utility model having two first cams.

[0020] Figure 7 It is Figure 6 Schematic diagram of another angle.

[0021] Figure 8 It is a schematic diagram of the structure of the camshaft of a door closer with a large door opening angle of the present utility model having one first cam.

[0022] Figure 9 It is Figure 8 Schematic diagram of another angle. Specific embodiments

[0023] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0024] Refer to Figures 1 to 9 . A door closer with a large door opening angle includes a housing 1, a spring 2, a camshaft 3, a piston 4, a first roller 5, and a second roller 6. The spring 2, the camshaft 3, and the piston 4 are all located inside the housing 1. The two ends of the camshaft 3 penetrate through the piston 4 and extend out of the housing 1. The first roller 5 and the second roller 6 are both installed on the piston 4 and are located on opposite sides of the camshaft 3. One end of the spring 2 abuts against the inner wall of the housing 1, and the other end abuts against the piston 4. The piston 4 is an integrally formed structure.

[0025] During use, since the piston 4 is an integrally formed structure, when the camshaft 3 rotates to open the door, it acts on the corresponding roller, and the roller then acts on the piston 4, so that the piston acts on the spring 2, causing the spring 2 to be compressed. At this time, the entire piston 4 moves as a whole, ensuring that the camshaft always remains in contact with the piston. When the door leaf needs to be closed, the spring 2 rebounds, pushing the entire piston to move, and the piston acts on the camshaft 3, causing the camshaft 3 to rotate.

[0026] The piston 4 is provided with an installation groove 41. The camshaft 3 passes through the installation groove 41 and extends out. The first roller 5 and the second roller 6 are respectively located on opposite sides of the installation groove 41. Specifically, installation shafts are installed on both sides of the installation groove 41, and the two rollers are respectively sleeved on the corresponding installation shafts.

[0027] The camshaft 3 includes a rotating shaft 31, a first cam 32 and a second cam 33. The first cam 32 and the second cam 33 are both arranged on the rotating shaft 31 and are integrally formed with the rotating shaft 31. The first cam 32 abuts against the first roller 5, and the second cam 33 abuts against the second roller 6. The second roller 6 is close to the spring 2 side. When opening and closing the door, the second cam 33 acts on the second roller 6. The second cam 33 pushes the second roller 6 and the entire piston, or the second roller 6 acts on the second cam 33.

[0028] The first cam 32 is located above the second cam 33. A first protrusion 321 is provided on one side of the first cam 32, and a second protrusion 331 is provided on one side of the second cam 33. The first protrusion 321 and the second protrusion 331 are staggeredly distributed.

[0029] When opening the door, the second cam 33 pushes the second roller 6. At this time, the first cam 32 is in contact with the first roller 5. By maintaining contact between the first cam 32 and the first roller 5, it is prevented that the rotating shaft 31 separates from the roller and reverses during the process of opening or closing the door, ensuring the normal opening and closing of the door leaf and avoiding the separation of the camshaft 3 from the roller.

[0030] A limiting groove 322 is provided on the other side of the first cam 32, and a groove 332 is provided on the other side of the second cam 33. The limiting groove 322 can cooperate with the first roller 5, and the groove 332 can cooperate with the second roller 6.

[0031] The maximum opening angle of the door leaf can be achieved through the second protrusion 331; due to the staggered distribution of the first protrusion 321 and the second protrusion 331, that is, when the second cam 33 rotates more than 90°, the limiting groove 322 on the first cam 32 only cooperates with the first roller 5 to realize the limitation of the maximum opening angle of the door, thereby increasing the opening angle of the door leaf and achieving the effect of a large opening angle of the door.

[0032] As Figure 4 and Figure 5 shown, in an embodiment, the limiting groove 322 and the groove 332 are flush, and the axis of the second cam 33 and the axis of the rotating shaft 31 are on the same straight line. In this embodiment, since the axis of the second cam 33 and the axis of the rotating shaft 31 are on the same straight line, when the limiting groove 322 cooperates with the corresponding roller, the first cam 32 will not continue to rotate, so that the entire rotating shaft 31 will not continue to rotate, realizing the positioning when the door is opened to the maximum, and realizing the positioning function of the door leaf.

[0033] As Figures 6 to 9 shown, in another embodiment, the limiting groove 322 and the groove 332 are staggeredly distributed, and the axis of the second cam 33 is located on one side of the axis of the rotating shaft 31. Therefore, in this embodiment, since the axis of the second cam 33 is located on one side of the axis of the rotating shaft 31, that is, the axes of the two are not on the same straight line, and the axis of the first cam 32 and the rotating shaft 31 are on the same straight line. Therefore, when the limiting groove 322 cooperates with the roller on the door closer, the second cam 3 cannot be positioned, which is convenient for the second cam 33 to automatically close the door after being opened to the maximum angle.

[0034] There are two first cams 32, which are respectively located at the upper and lower ends of the second cam 33, and there are two first rollers 5 corresponding to the first cams 32. In actual use, the first cam 32 can be one or two. By providing two first cams 32, it is convenient to improve the smoothness of the force, facilitate improving the bearing capacity, and meet the use requirements of different occasions.

[0035] For the arcs on both sides between the second protrusion 331 and the groove 332 in the second cam 33, the arc length on one side is greater than that on the other side. Therefore, when the second cam 33 opens and closes the door, it contacts the corresponding roller through the arc with a larger length, which is convenient for the second cam 33 to push the door leaf to open a larger opening angle and meet the use requirements of a large opening angle.

[0036] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A door closer with a large opening angle, characterized in that, It includes a housing (1), a spring (2), a camshaft (3), a piston (4), a first roller (5) and a second roller (6). The spring (2), the camshaft (3) and the piston (4) are all located inside the housing (1). Both ends of the camshaft (3) penetrate through the piston (4) and extend out of the housing (1). The first roller (5) and the second roller (6) are both installed on the piston (4) and are located on opposite sides of the camshaft (3). One end of the spring (2) abuts against the inner wall of the housing (1), and the other end abuts against the piston (4). The piston (4) is an integrally formed structure.

2. The door closer with a large opening angle according to claim 1, characterized in that, An installation groove (41) is provided on the piston (4). The camshaft (3) penetrates through the installation groove (41) and extends out. The first roller (5) and the second roller (6) are respectively located on opposite sides of the installation groove (41).

3. The door closer with a large opening angle according to claim 2, characterized in that, The camshaft (3) includes a rotating shaft (31), a first cam (32) and a second cam (33). The first cam (32) and the second cam (33) are both provided on the rotating shaft (31) and are integrally formed with the rotating shaft (31). The first cam (32) abuts against the first roller (5), and the second cam (33) abuts against the second roller (6). The second roller (6) is on the side close to the spring (2).

4. The door closer with a large opening angle according to claim 3, characterized in that, The first cam (32) is located above the second cam (33). A first protrusion (321) is provided on one side of the first cam (32), and a second protrusion (331) is provided on one side of the second cam (33). The first protrusion (321) and the second protrusion (331) are staggeredly distributed.

5. A door closer with a large opening angle according to claim 3 or 4, characterized in that, A limiting groove (322) is provided on the other side of the first cam (32), and a groove (332) is provided on the other side of the second cam (33). The limiting groove (322) can cooperate with the first roller (5), and the groove (332) can cooperate with the second roller (6).

6. The door closer with a large opening angle according to claim 5, characterized in that The limiting groove (322) and the groove (332) are flush. The axis of the second cam (33) and the axis of the rotating shaft (31) are on the same straight line.

7. The door closer with a large opening angle according to claim 5, characterized in that, The limiting groove (322) and the groove (332) are staggeredly distributed. The axis of the second cam (33) is on one side of the axis of the rotating shaft (31).

8. A door closer with a large opening angle according to claim 3 or 4, characterized in that, There are two first cams (32), which are respectively located at the upper and lower ends of the second cam (33). The first rollers (5) corresponding to the first cams (32) are two.

9. The door closer with a large opening angle according to claim 5, characterized in that, For the second cam (33), the arc lengths of the two sides between the second protrusion (331) and the groove (332) are different, and the arc length of one side is greater than that of the other side.

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