Door closer cam shaft with large door opening angle

Abstract

The utility model discloses a door closer camshaft with a large door opening angle, which comprises a rotating shaft, a first cam and a second cam, the first cam and the second cam are both arranged on the rotating shaft and are integrated with the rotating shaft, the first cam is positioned above the second cam, one side of the first cam is provided with a first lug boss, and the other side of the first cam is provided with a second lug boss. A second protruding part is arranged on one side of the second cam, and the first protruding part and the second protruding part are distributed in a staggered mode. According to the door closer, the first cam and the second cam are arranged on the rotating shaft, and the first protruding part and the second protruding part are distributed in a staggered mode, so that after the second cam rotates by more than 90 degrees, the second cam is prevented from rotating through the contact action of the first cam and a corresponding roller on the door closer all the time, and the rotating angle of the second cam is increased; therefore, the second cam can act on another rolling wheel with the door opening function, the door opening angle is increased, and the corresponding use requirement is met.

Description

Technical Field

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

[0002] The camshafts on existing door closers are basically equipped with a cam, which acts on the roller on the door closer to complete the door opening, closing and other positioning functions. For example, application No. 202120580614.7 discloses a door closer cam, in which the cams are symmetrically arranged, and the door closing positioning is achieved through the positioning groove on one side of the cam and the roller on the door closer. Therefore, when this type of camshaft rotates, when the cam rotates 90°, the door opens to the most open position, but when the cam actually rotates 90°, the door opening angle will be less than 90°, that is, when this type of cam is used on the door closer, the door opening angle is small and the door opening angle is greatly limited. Utility Model Content

[0003] The utility model aims to provide a door closer cam shaft with a large door opening angle, which can solve at least one of the above problems.

[0004] According to one aspect of the utility model, a door closer cam shaft with a large door opening angle is provided, comprising a rotating shaft, a first cam and a second cam, the first cam and the second cam are both arranged on the rotating shaft and are integrally formed with the rotating shaft, the first cam is located above the second cam, a first protrusion is provided on one side of the first cam, a second protrusion is provided on one side of the second cam, and the first protrusion and the second protrusion are staggered.

[0005] The beneficial effect of the utility model is that the first cam and the second cam are arranged on the rotating shaft, and the first protrusion and the second protrusion are staggered, so that after the second cam rotates more than 90°, the first cam and the corresponding roller on the door closer are always kept in contact, and the second cam is prevented from rotating, which is conducive to increasing the rotation angle of the second cam, that is, it is conducive to the second cam acting on another roller for opening the door, thereby increasing the door opening angle and meeting the corresponding use requirements.

[0006] 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. Thus, the limiting groove on the first cam can realize the positioning of the rotating shaft when closing the door.

[0007] 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 located on the same straight line. Thus, when the door is opened to the maximum angle, the door is positioned for opening.

[0008] In some embodiments, the limiting groove and the groove are staggered, and the axis of the second cam is located on one side of the axis of the rotating shaft. Thus, the axes of the two are not on the same straight line, so that when the door is opened to the maximum angle, the door can automatically return to the closed state.

[0009] In some embodiments, there are two first cams, which are respectively located at the upper and lower ends of the second cam, thereby improving the stability of the rotation of the entire shaft and facilitating the improvement of the load-bearing capacity.

[0010] In some embodiments, the arcs on both sides of the second cam between the second protrusion and the groove have a length on one side that is greater than the length on the other side, thereby increasing the door opening angle accordingly. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of one embodiment of a door closer cam shaft with a large door opening angle having two first cams according to the utility model.

[0012] Figure 2 yes Figure 1 A schematic diagram of the structure from another angle.

[0013] Figure 3 It is a structural schematic diagram of another implementation manner of a door closer cam shaft with a large door opening angle and two first cams according to the utility model.

[0014] Figure 4 yes Figure 3 A schematic diagram of the structure from another angle.

[0015] Figure 5 The utility model is a structural schematic diagram of a door closer cam shaft with a large door opening angle having a first cam mode.

[0016] Figure 6 yes Figure 5 A schematic diagram of the structure from another angle. DETAILED DESCRIPTION

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0018] Reference Figure 1 to Figure 6 A door closer cam shaft with a large door opening angle comprises a rotating shaft 1, a first cam 2 and a second cam 3. The first cam 2 and the second cam 3 are both arranged on the rotating shaft 1 and are integrally formed with the rotating shaft 1. The first cam 2 is located above the second cam 3. A first protrusion 21 is provided on one side of the first cam 2, and a second protrusion 31 is provided on one side of the second cam 3. The first protrusion 21 and the second protrusion 31 are staggered.

[0019] The camshaft of the door closer with a large door opening angle of the utility model is used on the door closer, and the first cam 2 and the second cam 3 act on the rollers on the corresponding sides of the piston in the door closer respectively. The second cam 3 pushes the roller on one side of the piston to realize the opening or closing of the door; the first cam 2 acts on the roller on the other side, and the first cam 2 always contacts the roller on the other side. Therefore, when the second cam 3 pushes the piston to move to realize the opening and closing of the door leaf, the first cam 2 contacts the roller, so that the entire camshaft contacts the roller on the other side, thereby preventing the rotating shaft 1 from separating from the roller and reversing during the process of opening or closing the door, and ensuring the normal opening and closing of the door leaf.

[0020] A limiting groove 22 is provided on the other side of the first cam 2 , and a groove 32 is provided on the other side of the second cam 3 .

[0021] The maximum opening angle of the door leaf can be achieved through the second protrusion 31; since the first protrusion 21 and the second protrusion 31 are staggered, that is, when the second cam 3 rotates more than 90°, the limiting groove 22 on the first cam 2 cooperates with the corresponding roller to achieve 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 door opening angle.

[0022] like Figure 1 and Figure 2 As shown, in one embodiment, the limit groove 22 and the groove 32 are flush, and the axis of the second cam 3 is on the same straight line as the axis of the rotating shaft 1. In this embodiment, the axis of the second cam 3 is on the same straight line as the axis of the rotating shaft 1, so when the limit groove 22 cooperates with the corresponding roller, the first cam 2 will not continue to rotate, so that the entire rotating shaft will not continue to rotate, and the positioning when the door is opened to the maximum is realized, and the positioning function of the door leaf is realized.

[0023] like Figure 3 and Figure 4 As shown, in another embodiment, the limiting groove 22 and the groove 32 are staggered, and the axis of the second cam 3 is located on one side of the axis of the rotating shaft 1. Therefore, in this embodiment, since the axis of the second cam 3 is located on one side of the axis of the rotating shaft 1, that is, the axes of the two are not located on the same straight line, the axes of the first cam 2 and the rotating shaft 1 are located on the same straight line. Therefore, when the limiting groove 22 cooperates with the roller on the door closer, the second cam 3 cannot be positioned, so that the second cam 3 is opened to the maximum angle and the door is automatically closed.

[0024] In another embodiment, there are two first cams 2, which are respectively located at the upper and lower ends of the second cam 3. In actual use, there can be one or two first cams 2. By providing two first cams 2, it is convenient to improve the stability of force, which is conducive to improving the bearing capacity and meeting the use requirements of different occasions.

[0025] The arcs on both sides between the second protrusion 31 and the groove 32 of the second cam 3 are longer on one side than on the other side. Therefore, when the second cam 3 is opening or closing the door, the arc on the side with the larger length contacts the corresponding roller, so that the second cam 3 can push the door leaf to open a larger door opening angle, thus meeting the use requirement of a large door opening angle.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements all fall within the protection scope of the present invention.

Claims

1. A door closer cam shaft with a large door opening angle, characterized in that: The invention comprises a rotating shaft (1), a first cam (2) and a second cam (3); the first cam (2) and the second cam (3) are both arranged on the rotating shaft (1) and are integrally formed with the rotating shaft (1); the first cam (2) is located above the second cam (3); a first protrusion (21) is arranged on one side of the first cam (2); a second protrusion (31) is arranged on one side of the second cam (3); and the first protrusion (21) and the second protrusion (31) are staggered.

2. A door closer cam shaft with a large door opening angle according to claim 1, characterized in that: A limiting groove (22) is provided on the other side of the first cam (2), and a groove (32) is provided on the other side of the second cam (3).

3. A door closer cam shaft with a large door opening angle according to claim 2, characterized in that: The limiting groove (22) and the groove (32) are flush with each other, and the axis of the second cam (3) and the axis of the rotating shaft (1) are located on the same straight line.

4. A door closer cam shaft with a large door opening angle according to claim 2, characterized in that: The limiting groove (22) and the groove (32) are staggered and distributed, and the axis of the second cam (3) is located on one side of the axis of the rotating shaft (1).

5. A door closer cam shaft with a large door opening angle according to any one of claims 1 to 4, characterized in that: There are two first cams (2), which are respectively located at the upper and lower ends of the second cam (3).

6. A door closer cam shaft with a large door opening angle according to claim 5, characterized in that: The arcs on both sides between the second protruding portion (31) and the groove (32) in the second cam (3) have an arc length on one side that is greater than an arc length on the other side.

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