KR20200048851A - damping apparatus of bidirectionally openable revolving odoor - Google Patents

Abstract

According to the present invention, a damping apparatus for a door capable of being bidirectionally rotated and opened/closed uses a structure of a gear instead of a cam, thereby being more accurately and stably performing a damping function as compared to the damping apparatus using the cam, having excellent durability, stably fixing and maintaining the opening and closing state of the door, and stably fixing and maintaining the opening and closing state of the door even when an opening and closing degree of the door is changed in stages.

Description

Damping apparatus of bidirectionally openable revolving odoor}

The present invention relates to a damping device for a door, and more particularly, to a damping device for a door that can be opened and closed in both directions.

A damping device for a door that can be opened and closed while rotating in both directions refers to a device that is installed on the floor or upper door frame or inside the door of a building's entrance door to buffer the door so that it automatically closes slowly when the door is opened and closed. The damping device of a conventional door has a mechanism in which the damping force is controlled while the hydraulic fluid inside the damping device moves by the interlocking operation of the cam, piston, and spring that rotate when the door is opened or closed.

In the case of the door damping device using the cam, the cam under the action of a strong force is worn, and there is a high possibility that the accuracy of the operation is deteriorated, but the durability of the door damping device is deteriorated. On the other hand, when a door that can be opened and closed actually is installed, it is a reality that the demand or demand for a function capable of maintaining the opening and closing degree of the door fixedly and fixing the opening and closing degree step by step is high. In some cases, these demands have not been met.

Accordingly, the technical problem to be solved by the present invention is to provide an accurate and stable damping function compared to a damping device using a cam by using a gear structure rather than a cam, and to provide a damping device for a door that can be opened and closed in both directions with excellent durability. will be.

Another technical problem to be solved by the present invention is to be able to stably maintain the opening and closing state of the door, and furthermore, to rotate and open in both directions to stably maintain the opening and closing state of the door even when the degree of opening and closing of the door is changed stepwise. It is possible to provide a door damping device.

The technical problems to be achieved by the present invention are not limited to the technical problems mentioned above, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description. Will be able to.

A damping device for a door that can be opened and closed in both directions according to the present invention for solving the above technical problem includes: a body in which a cylindrical inner space in a horizontal direction filled with hydraulic oil is formed; A spring inserted into one side of the inner space to provide elastic force; Supported by the spring and inserted into the other side of the inner space, head portions are provided to seal the inner space at both ends, and horizontal holes formed in the vertical direction are formed between the head portions. Pistons are formed on the left and right side walls of the first and second gear portions; The long hole is inserted through, and one end is sealed and protruded from the main body and fixed to the door. A third gear part and a first rotation angle fixing groove part are formed in the longitudinal direction along the clockwise direction in the center of the front part, and the front part A fourth gear portion and a second rotation angle fixing groove portion are formed in the longitudinal direction in a counterclockwise direction from the center, and a rear portion is seated on a rounding portion provided at one end of the long hole such that the front portion faces the other end of the long hole, A rotating shaft interlocked with the door; And a rotation angle fixing member protruding from the other end of the elongated hole, and having a protruding degree varying according to a force applied by the rotating shaft.

When the rotating shaft rotates clockwise, the third gear part engages with the first gear part and moves the piston to one side of the interior space, but the fourth gear part does not mesh with the second gear part and has a constant rotation angle. Beyond, after the fourth gear part is engaged with the first gear part, the rotational angle fixing member is inserted / released in the second rotation angle fixing groove, and the clockwise rotation state of the door can be fixed stepwise.

When the rotating shaft rotates counterclockwise, the fourth gear part engages with the second gear part and moves the piston to one side of the inner space, but the third gear part does not mesh with the first gear part and has a constant rotation angle. After the third gear part is engaged with the second gear part, the rotation angle fixing member may be inserted / released in the first rotation angle fixing groove to fix the counterclockwise rotation state of the door step by step.

The rotation angle fixing member is provided with a cylindrical first accommodation space therein, screwed to a hole provided in the center of the other side wall of the long hole, and at one end of the other side of the long hole is a hole formed narrower than the diameter of the first receiving space A coupling member having a first locking portion; A first fixing groove insertion member which is inserted into one end of the first accommodation space and partially protrudes through the first locking portion; And a first spring inserted into the first accommodation space and supporting the fixing groove insertion member in the long hole direction. In this case, the first fixing groove inserting member may be inserted into / released from the first and second rotating angle fixing grooves while the protruding degree is changed by the force applied by the rotating shaft.

The portion of the first fixing groove insertion member that protrudes through the first locking portion has a rod-like cuboid shape, and ends of the cuboid shape are formed in the longitudinal direction of the rotary shaft. It can be characterized in that it is rounded along the longitudinal direction of the rotating shaft so that it can be inserted into the rotating angle fixing groove.

A second accommodating space having a cylindrical shape may be provided at a central portion of the other side wall of the elongated hole, and a second locking portion, which is a hole having a reduced diameter, may be formed at one end of the second accommodating space that borders the other side of the elongated hole. At this time, the rotation angle fixing member is inserted into one end of the second receiving space, a part of the second fixing groove insertion member protruding through the second locking portion; And a second spring inserted into the second receiving space and supporting the second fixing groove inserting member in the long hole direction, wherein the second fixing groove inserting member has a protrusion degree applied to the force applied by the rotating shaft. By being variable, it can be inserted / removed from the first and second rotation angle fixing grooves.

The portion protruding through the second locking portion from the second fixing groove insertion member has a rod-like cuboid shape, and ends of the cuboid shape are formed in the longitudinal direction of the rotating shaft. It is preferable to be rounded along the longitudinal direction of the rotating shaft so that it can be inserted into the rotating angle fixing groove.

In each of the first and second gear portions, a gear value adjacent to the rounding portion has a lower height compared to other gear values, and a height may increase from one end of the inner space to the other end of the inner space.

The number of gear teeth provided in the first and second gear parts is different from each other, and the rotation corresponding to the gear part having a large number of gear teeth among the first and second gear parts among the first and second rotation angle fixing groove parts The number of fixing grooves provided in each fixing groove portion may be greater than the number of fixing grooves provided in other rotation angle fixing grooves.

The damping device for the door that can be opened and closed in both directions according to the present invention uses the gear structure, not the cam, and performs an accurate and stable damping function compared to the damping device using the cam, and at the same time, has excellent durability due to the unique gear structure. connect.

And the damping device for the door that can be opened and closed in both directions according to the present invention can stably maintain the opening and closing state of the door, and furthermore, it can stably maintain the opening and closing state of the door even when the degree of opening and closing of the door is changed stepwise. It can provide an effect.

1 is an assembly complete view of a damping device for a door that can be opened and closed in both directions according to the present invention.
2A to 2 are views for explaining the operating principle of the door damping device capable of opening and closing in both directions according to the present invention.
Figure 3 is a conceptual diagram for explaining the structural features of the gear provided on the piston of the damping device for a door that can be opened and closed in both directions according to the present invention.
4A and 4B are perspective and cross-sectional views of an example of a rotating shaft of a damping device for a door that can be opened and closed in both directions according to the present invention.
5A and 5B are views of a piston of a door damping device for a door that can be opened and closed in both directions according to the present invention in various directions.
6A and 6B are views showing an example of a rotation axis of the door damping device 100 of a door that can be opened and closed in both directions according to the present invention.
7 is a view showing an example of a rotating shaft of a damping device for a door that can be opened and closed in both directions according to another embodiment of the present invention.

In order to fully understand the present invention, the operational or functional advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing may denote the same members.

1 is an assembly complete view of a damping device 100 of a door that can be opened and closed in both directions according to the present invention. 2A to 2 are schematic diagrams for explaining the operating principle of the door damping device 100 capable of opening and closing in both directions according to the present invention. For reference, FIGS. 2A to 2C are schematic views created by looking at the door damping device 100 from above.

Figure 3 is a conceptual diagram for explaining the structural features of the gear provided on the piston 130 of the damping device 100 of the door that can be opened and closed in both directions according to the present invention. 4A and 4B are perspective views and cross-sectional views of an example of the rotating shaft 140 of the damping device 100 for a bidirectional rotating switchable door according to the present invention.

5A and 5B are views of the piston 130 of the door damping device 100 of the door capable of rotating and opening in both directions according to the present invention in various directions. 6A and 6B are diagrams showing an example of the rotation shaft 150 of the door damping device 100 of a door that can be opened and closed in both directions according to the present invention. 7 is a view showing an example of a rotating shaft 140 ′ of a damping device for a bidirectional rotating switchable door according to another embodiment of the present invention.

The damping device (100, hereinafter referred to as a 'door damping device') of the bidirectional rotating switchable door includes a main body 110, a spring 120, a piston 130, a rotating shaft 140, and a rotating angle fixing member 150. Includes. Since the components of the door damping device 100 shown in the drawings are not essential, the door damping device 100 may have more or fewer components. This is the same for each component constituting the door damping device 100. Hereinafter, each component will be described in more detail.

The main body 110 is provided with a cylindrical inner space 111 in a horizontal direction filled with hydraulic oil. The spring 120 is inserted into one side of the inner space 111 to provide elastic force. The piston 130 is supported by the spring 120 and inserted into the other side of the inner space 111, and both ends are provided with head portions 131 for sealing the inner space 111, and the head portion Between 131, a horizontal long hole 132 penetrated in a vertical direction is formed, and a first gear portion 133 and a second gear portion 134 are formed on left and right walls of the long hole 132. have.

One end of the long hole 132 of the piston 130 is provided with a first hole 136 for moving the hydraulic fluid in communication with one side of the inner space 111. And the other end of the long hole 132 of the piston 130 is for moving the hydraulic fluid in communication with the other side of the second hole 137 and the inner space 111, the rotation angle fixing member 150 is inserted and fixed by screw coupling The third hole 138 is provided.

In a conventional door damping device, a hole for moving the hydraulic oil is provided at a position corresponding to the second hole 137 in the piston 130. On the other hand, the door damping device 100 according to the present invention is provided with the rotation angle fixing member 150 for fixing the opening / closing state of the door, and the third hole 138 for moving the working oil is the piston 130 It is provided off-center. This can be called the piston structure unique to the present invention.

On the other hand, the core of the technical idea of the present invention is a door damping operation by interlocking between the gears provided on the piston 130 and the rotating shaft 140, and when the door is opened or closed at a certain angle or more, the degree of opening and closing of the door is fixed. I can do it. In addition, since the movement and function of the hydraulic oil in the door damping device 100 according to the present invention are the same or similar to those of the conventional door damping device, detailed descriptions of the hydraulic oil-related contents are omitted herein.

The rotating shaft 140 is inserted through the long hole 132, the one end 145 is sealed protruding from the body 110 and fixed to the door (not shown), in the center of the front portion of the body 140 ' The third gear part 141 and the second rotation angle fixing groove part 142 are formed in the longitudinal direction along the clockwise direction.

In the rotation shaft 140 body 140 ', a fourth gear portion 143 and a second rotation angle fixing groove 144 are formed in the longitudinal direction along the counterclockwise direction from the center of the front portion. In addition, the rotating shaft 140 is seated on the rounding portion 135 provided at one end of the long hole 132 so that the front portion faces the other end of the long hole 132. The rotating shaft 140 has a sealing protrusion 145 fixed to the door to rotate in conjunction with the door.

The rotation angle fixing member 150 protrudes from the other end of the elongated hole 132 of the piston 130, while the degree of protruding is varied by the force applied by the rotation shaft 140, and the removal of the rotation shaft 140 is performed. The rotational state of the door can be fixed stepwise while inserting / detaching into the rotation angle fixing member 142 and the second rotation angle fixing groove 144.

The rotation angle fixing member 150 includes a coupling member 151, a first fixing groove insertion member 155 and a first spring 156. The coupling member 151 is provided with a first receiving space 153 therein, the second hole provided in the center of the other side wall of the long hole 132 of the piston 130 by the thread 152 of the surface ( 137). In the coupling member 151, one end of the other side of the long hole 132 is formed with a first locking portion 154 formed narrower than the diameter of the first receiving space 153.

The first fixing groove inserting member 155 is inserted into one end of the first receiving space 153, and a part of which protrudes through the first locking portion 154. The first spring 156 is inserted into the first accommodation space 153 to support the first fixing groove insertion member 155 in the direction of the long hole 132 of the piston 130.

The first fixing groove inserting member 155 is provided with the first rotation angle fixing groove 142 and the second rotation angle fixing groove 144 while the degree of protrusion is varied by the force applied by the rotation shaft 140. It can be inserted / released. Accordingly, the opening and closing state of the door may be fixed step by step. At this time, according to the opening / closing direction of the door, the fixing groove part into which the first fixing groove inserting member 155 is to be inserted is determined to be the first rotation angle fixing groove part 142 and the second rotation angle fixing groove part 144 log. .

Meanwhile, a portion of the first fixing groove insertion member 155 that protrudes through the first locking portion 154 has a rod-shaped cuboid shape. And the cuboid-shaped end portion 155 'may be inserted into the first rotation angle fixing groove 142 and the second rotation angle fixing groove 144 formed in the longitudinal direction of the rotation shaft 140, It is characterized in that it is rounded along the longitudinal direction of the rotating shaft 140.

That is, the first fixing groove insertion member 155, unlike a simple spherical pressing means, the first rotation angle fixing groove portion 142 and the second rotation angle fixing groove portion in the longitudinal direction of the rotation shaft 140 ( Since it is inserted over a certain section in 144), it is possible to provide a strong rotation angle fixing force compared to a simple spherical pressing means.

Unlike the door damping device 100 according to the present invention in which the rotation angle fixing member 150 is screwed to the hole 137 provided on the other side of the long hole 132 of the piston 130, the long hole 132 A hole is provided on the other side of the other type of rotation angle fixing member for fixing the rotation angle using the hole may be implemented. Let's look at an example of such a structure.

First, a second cylindrical receiving space is provided in the center of the other side wall of the long hole, and a second locking portion, which is a hole in which a diameter is reduced, is formed at one end of the second receiving space that forms a boundary with the other side of the long hole 132. have. The locking portion may function as the first locking portion 154 of the rotation angle fixing member 150.

At this time, the other type of rotation angle fixing member is inserted into one end of the second receiving space, a part of which is inserted into the second fixing groove inserting member and the second receiving space protruding through the second locking portion and the It may be implemented as a second spring that supports the second fixing groove insertion member in the long hole direction.

Of course, the couple protruding through the second locking portion from the second fixing groove insertion member has a rod-shaped cuboid shape, and the end of the cuboid shape is fixed to the first rotation angle in the longitudinal direction of the rotation shaft 140. By having a round that is inserted over a certain section of the groove portion 142 and the second rotation angle fixing groove portion 144, the rotational angle fixing member of the other type can also provide a strong fixing force.

Meanwhile, the gear value 133a adjacent to the rounding portion 135 of the long hole 132 in the first gear portion 133 has a lower height compared to other gear values of the first gear portion 133, and It is characterized in that the height increases from one end of the inner space 111 toward the other end of the inner space 111. This is to ensure that the start of the engagement is smooth when the third gear part 141 starts to mesh with the first gear part 133. This mechanism can be equally applied to the second gear portion 134 and the fourth gear portion 143.

FIG. 3 is a view showing this content in more detail. Referring to FIG. 3, the height of the gear teeth 133a is preferably lower than 2/3 of the height H of the other gear teeth 133b. On the other hand, it is preferable that the lower part of the inclination of the gear teeth 133a is about 1/2 of the height h of the other gear teeth 133b. The height ratio is only according to an example of the present invention, and the scope of the present invention is not limited thereto.

2A to 2C as described above, a mechanism in which the door damping device 100 operates according to opening and closing of the door will be described in detail. For reference, FIG. 2A is a state in which the door is not opened and fixed, and FIG. 2B is a state in which the rotation shaft 140 starts to rotate clockwise as the door rotates, and FIG. 2C shows that the door is at a constant angle It indicates a state in which the rotation state of the door is fixed by the rotation angle fixing member 150 by rotating above.

In the state where the door is fixed, one gear 141c of the third gear part 141 corresponds to an adjacent gear groove of the first gear part 133, and the fourth gear part 143 One gear 143c corresponds to an adjacent gear groove (Fig. 2A). In this state, the rotating shaft 140 rotates clockwise. At this time, the rotation shaft 140 does not change the position, but only rotates.

Then, the third gear part 141 meshes with the first gear part 133 and moves the piston 130 to one side of the inner space 111 (FIG. 2B). However, the fourth gear part 143 is not engaged with the second gear part 134. Due to this, the friction force due to the gear bite is reduced, and thus the force required to open and close the door may be reduced, and the durability of the door damping device 100 may be increased. At this time, an external force is not applied to the first fixing groove insertion member 155 of the rotation angle fixing member 150, thereby maintaining the protruding state.

On the other hand, after the rotation angle of the rotation shaft 140 exceeds a certain rotation angle, the fourth gear part 143 is engaged with the first gear part 133 in the order of 143a 143b, 143c, and then the second rotation angle The first fixing groove inserting member 155 of the rotation angle fixing member 150 is inserted into the first fixing groove 144a of the fixing groove 144 to fix the rotation state of the door (FIG. 2C). At this time, the protruding length of the first fixing groove insertion member 155 is reduced by the force applied by the rotating shaft 140.

When the rotating shaft 140 is further rotated clockwise in the state of FIG. 2C, the first fixing groove inserting member 155 is fixed with the second rotation angle while the degree of protrusion is variable by the force exerted by the rotating shaft 140. It is inserted into the other fixing groove 144b of the groove portion 144. By this mechanism, the clockwise rotational state (ie, rotation angle) of the door can be fixed stepwise.

In the above, the case where the rotating shaft 140 rotates clockwise has been described. The case where the rotating shaft 140 rotates counterclockwise by applying the above-described mechanism will be described.

It is assumed that the rotating shaft 140 rotates counterclockwise in the state of FIG. 2A. Then, the fourth gear portion 143 is engaged with the second gear portion 134 and moves the piston 130 to one side of the inner space 111, but the third gear portion 141 is the first gear portion. It does not mesh with the gear part 133.

At this time, if the rotation angle of the rotation shaft 140 exceeds a certain rotation angle, the third gear part 141 meshes with the second gear part 134, and then the first rotation angle fixing groove part 142 to the first 1 As the fixing groove inserting member 155 is inserted / released, the rotational state of the door in the counterclockwise direction may be fixed stepwise according to the rotation angle.

As described above, the door damping device 100 according to the present invention may perform an opening / closing state fixing function for a plurality of opening / closing angles in both directions of the door. This function will be referred to as a function unique to the present invention that is not provided in the existing door damping device. On the other hand, since the first fixing groove insertion member 155 is inserted over a certain section in the longitudinal direction of the rotating shaft 140, it has been described above to provide a strong fixing force.

On the other hand, Figure 7 shows an example of the rotating shaft 140 of the damping device of the door that can be opened and closed in both directions, according to which the maximum opening and closing angle is different depending on the opening and closing direction, the rotation angle is greater for the larger direction. An angle fixing function can be provided, which will be described in more detail.

It is assumed that the first gear portion 133 and the second gear portion 134 have one more gear value of the first gear portion 133. At this time, the second rotation angle fixing groove portion 144 'in the rotation shaft 140' includes one more fixing groove 144c compared to the existing second rotation angle fixing groove portion 144.

When the rotating shaft 140 'rotates clockwise more by one gear than the rotating shaft 140, the first fixing groove insertion member 155 of the rotating angle fixing member 150 additionally includes the fixing groove ( 144c). This is a door damping device according to another embodiment of the present invention to which the rotating shaft 140 'is applied, the opening and closing state of the door opening / closing direction in which the rotating shaft 140' rotates clockwise compared to the counterclockwise direction. It means that it can be fixed more.

When the above-described bar is applied to the door damping device described above, the number of gear teeth provided on the left and right side walls of the long hole of the piston is different from each other, and the first and second rotation angle fixing grooves provided on the rotation shaft Among the first and second gear portions, if the number of fixing grooves provided in the rotation angle fixing groove corresponding to the gear portion having a large number of gear teeth is greater than the number of fixing grooves provided in the other rotation angle fixing groove, the opening / closing direction According to the case where the maximum opening / closing angle is different, more rotation angles can be fixed for a direction in which the opening / closing angle is larger. This configuration and the resulting mechanism will also be referred to as technical features unique to the present invention.

As described above, although the present invention has been described with limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations from these descriptions will be made by those skilled in the art to which the present invention pertains. This is possible.

Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the following claims, but also by the claims and equivalents.

100: door damping device 110: piston
120: spring 130: piston
140: rotating shaft 150: rotating angle fixing member

Claims (7)

The main body is formed of a horizontal inner cylindrical space filled with hydraulic oil;
A spring inserted into one side of the inner space to provide elastic force;
Supported by the spring and inserted into the other side of the inner space, head portions are provided to seal the inner space at both ends, and horizontal holes formed in the vertical direction are formed between the head portions. Pistons are formed on the left and right side walls of the first and second gear portions;
The long hole is inserted through, and one end is sealed and protruded from the main body and fixed to the door. A third gear part and a first rotation angle fixing groove part are formed in the longitudinal direction along the clockwise direction in the center of the front part, and the front part A fourth gear portion and a second rotation angle fixing groove portion are formed in the longitudinal direction in a counterclockwise direction from the center, and a rear portion is seated on a rounding portion provided at one end of the long hole such that the front portion faces the other end of the long hole, A rotating shaft interlocked with the door; And
It includes a rotation angle fixing member that protrudes to the other end of the long hole, but the degree of protrusion is variable according to the force applied by the rotating shaft,
When the rotation axis is rotated clockwise,
The third gear portion meshes with the first gear portion and moves the piston to one side of the internal space, but the fourth gear portion does not mesh with the second gear portion, and the fourth gear portion exceeds a predetermined rotation angle to the first gear portion After engaging with the gear portion, the rotation angle fixing member is inserted / detached into the second rotation angle fixing groove to fix the clockwise rotation state of the door stepwise.
When the rotation axis is rotated counterclockwise,
The fourth gear portion meshes with the second gear portion and moves the piston to one side of the internal space, but the third gear portion does not mesh with the first gear portion, and the third gear portion exceeds a predetermined rotation angle to the second gear portion After engaging with the gear portion, the rotation angle fixing member is inserted / detached into the first rotation angle fixing groove, and the door can be opened and closed in both directions, characterized in that the rotational state of the door can be fixed stepwise. Damping device.
According to claim 1, The rotation angle fixing member,
A cylindrical first accommodating space is provided inside, screwed to a hole provided in the center of the other side wall of the elongated hole, and a first engaging portion, a hole formed narrower than the diameter of the first accommodating space, is formed at one end of the other side of the elongated hole Coupling member;
A first fixing groove insertion member which is inserted into one end of the first accommodation space and partially protrudes through the first locking portion; And
And a first spring inserted into the first receiving space to support the fixing groove insertion member in the long hole direction,
The first fixing groove insertion member,
A damping device for a door that can be opened and closed in both directions, characterized in that the protruding degree is changed by a force applied by the rotating shaft and is inserted into / released from the first and second rotating angle fixing grooves.
The method of claim 2, wherein the portion that protrudes through the first locking portion from the first fixing groove insertion member,
It has a rod-shaped cuboid shape,
The end of the rectangular parallelepiped shape,
A damping device for a door that can be opened and closed in both directions, characterized in that it is rounded along the longitudinal direction of the rotating shaft so that it can be inserted into the first and second rotating angle fixing grooves formed in the longitudinal direction of the rotating shaft.
According to claim 1, A second receiving space of a cylindrical shape is provided in the center of the other side wall of the long hole,
In the second receiving space, a second engaging portion, which is a hole having a reduced diameter, is formed at one end portion that forms a boundary with the other side of the long hole,
The rotation angle fixing member,
A second fixing groove insertion member which is inserted into one end of the second accommodation space and partially protrudes through the second locking portion; And
And a second spring inserted into the second receiving space to support the second fixing groove insertion member in the long hole direction,
The second fixing groove insertion member,
A damping device for a door that can be opened and closed in both directions, characterized in that the protruding degree is changed by a force applied by the rotating shaft and is inserted into / released from the first and second rotating angle fixing grooves.
The method of claim 4, wherein the portion that protrudes through the second locking portion from the second fixing groove insertion member,
It has a rod-shaped cuboid shape,
The end of the rectangular parallelepiped shape,
A damping device for a door that can be opened and closed in both directions, characterized in that it is rounded along the longitudinal direction of the rotating shaft so that it can be inserted into the first and second rotating angle fixing grooves formed in the longitudinal direction of the rotating shaft.
According to claim 1, Gear teeth adjacent to the rounding portion in each of the first and second gear portion,
A damping device for a door that can be opened and closed in both directions, characterized in that the height is lower than that of other gear teeth, and the height increases from one end of the inner space to the other end of the inner space.
According to claim 1, The number of gear teeth provided in the first and second gear parts are different from each other,
Among the first and second rotation angle fixing grooves, the number of fixing grooves provided in the rotation angle fixing grooves corresponding to a gear portion having a large number of gear teeth among the first and second gear portions is fixed to the rotation angle fixing grooves having different numbers. A damping device for a door that can be opened and closed in both directions, characterized by more than the number of grooves.

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