KR20200088560A - shock-absorbing hinge apparatus for hinged door and construction method thereof - Google Patents

Abstract

The present invention provides a construction method of a shock-absorbing hinge apparatus for a hinged door to improve work convenience during construction and improve the durability of each component. The construction method of a shock-absorbing hinge apparatus for a hinged door comprises: a first step in which a first housing unit having a first hollow space, a first hinge unit having a first base unit protruding to the outside of the radial direction of the first housing unit, a second housing unit having a second hollow space longitudinally communicating with the first hollow space to form a rotating space, a second hinge unit having a second base unit protruding to the outside of the radial direction of the second housing unit, and an automatic rotating return means including at least one cam unit arranged in the rotating space are coupled to each other and prepared; a second step in which the first base unit is coupled to one of a door and a door frame, and the second base unit is coupled to the other one of the door and the door frame; a third step in which an accommodation groove is drilled on one of the door and the door frame, and the accommodation groove is guided and formed by a coupling hole formed on one of the first base unit and the second base unit; and a fourth step in which a shock-absorbing support device arranged to be perpendicular to the automatic rotating return means to provide shock-absorbing power by a working fluid flowing while the front end thereof protruding between the first base unit and the second base unit during rotating return of the automatic rotating return means is pressed on an opposite surface of one of the door and the door frame is inserted and fixed in the accommodation groove.

Description

Shock-absorbing hinge apparatus for hinged door and construction method thereof

The present invention relates to a buffer hinge device for a swing door and a construction method thereof, and more particularly, to a buffer hinge device for a swing door with improved durability of each component while improving work convenience during construction, and a construction method thereof.

Generally, the door and the door frame are connected by a hinge, and as the other side of the door is spaced apart from the other side of the door frame as it is rotated around the rotation axis of the hinge.

Here, the hinge includes a pair of support means that are fixed to the mutually adjacent positions of the door and the door frame, and the support means are provided to be opened or contacted with each other while being rotated about one rotation axis.

On the other hand, the conventional casement door has a hassle of manually opening and closing the door when entering or leaving a person. At this time, when the external force transmitted when closing the door is weak, the door is not substantially closed and thus cannot maintain a proper indoor temperature, and there is inconvenience due to noise or contaminants. On the other hand, if the external force transmitted when closing the door is strong, there is a problem that a part of the body, such as a finger, is caught between the door and the door frame, resulting in injury.

Accordingly, a hinge equipped with an automatic return means has been partially disclosed so that the opened door can be automatically closed.

The hinge provided with the automatic return means includes a fixed cam connected to the door and rotated interlockingly, a driving cam engaged with the fixed cam, and elastic means elastically supporting the driving cam. At this time, the inclined surfaces inclined at a predetermined angle are respectively formed on the side of the opposing surfaces of the fixed cam and the driving cam.

In detail, the fixed cam and the driving cam are disposed in a state in which the opposing surfaces are in close contact with each other while the door is closed. Then, when an external force is applied in one direction to open the door, the inclined surface formed in the driving cam slides along the inclined surface formed in the fixed cam. Accordingly, the driving cam is spaced apart from the fixed cam, and the elastic means is compressed.

At this time, when the external force used to open the door is removed or a predetermined external force acts on the other side, the drive cam is pressed to the fixed cam side by the elastic restoring force of the elastic means. Accordingly, since the drive cam and the fixed cam are rotated and returned in close contact with each other, the door may be automatically closed.

However, in the case of the conventional hinge provided with such an automatic return means, when excessive rotational force is applied due to frequent opening or external force of the door, the inclined surfaces of the driving cam and the fixed cam are worn or damaged. Due to this, the drive cam and the fixed cam are not properly molded, and the door cannot be completely closed due to a change in the rotational radius in the closing direction.

In addition, when the elastic restoring force of the elastic means is largely set, there is a problem that the user's discomfort cannot be substantially eliminated, such as an injury or a large impact sound caused by a body part being caught due to an increase in the speed of automatically returning to rotation.

Moreover, the hinge provided with the conventional automatic return means has substantially no function to keep the door open. For this reason, there is a problem in that a separate stopper device is installed on the door or a temporary load is required to temporarily support the door, causing inconvenience.

Korean Registered Patent No. 10-0227866

In order to solve the above problems, the present invention is to provide a buffer hinge device for a hinged door with improved durability of each component while improving work convenience during construction, and a construction method thereof.

In order to solve the above problems, the present invention provides a first hinge portion provided with a first housing portion in which a first hollow is formed and a first base portion protruding radially outward from the first housing portion, and the first hollow portion and the length. A second hinge part having a second hollow part communicating with the second hollow part forming a rotation space and a second base part protruding radially outward of the second housing part, and at least one disposed in the rotation space A first step in which the automatic rotation return means including the above cam parts are coupled and prepared with each other; A second step in which the first base portion is coupled to any one of the door and the door frame, and the second base portion is coupled to the other one of the door and the door frame; A third step in which an accommodating groove is perforated in one of the door and the door frame, the accommodating groove being guided and formed by a coupling hole formed in one of the first base part and the second base part; And a front end portion disposed vertically to the automatic rotation return means but protruding between the first base part and the second base part when the automatic rotation return means returns to rotation, being pressed against an opposite surface of the door and the door frame. It provides a construction method of a buffer hinge device for a hinged door comprising a fourth step in which a buffer support device that provides a buffer force by a working fluid that flows is fixed to the receiving groove.

Here, in the third step, when the drill device provided for forming a hole drills any one of the door and the door frame corresponding to the position of the coupling hole, the drill device is guided by the coupling hole and the receiving groove Including the step of forming, the fourth step, at least one fitting protrusion protruding radially outward at a predetermined interval along a circumferential direction on the outer circumferential front end side of the main body portion of the buffer support device to the receiving groove It is preferred to include a step of fitting.

On the other hand, the present invention is a first hinge portion provided with a first housing portion formed with a first hollow, and a first base portion protruding radially outwardly of the first housing portion and coupled to any one of a door and a door frame; A second housing part in which a second hollow is formed in the longitudinal direction communicating with the first hollow to form a rotating space, and a second housing protruding radially outside the second housing part and coupled to the other of the door and the door frame A second hinge portion provided with a base portion; Automatic rotation return means including at least one cam portion and a first elastic means disposed in the rotating space, the rotation return to rotation by the elastic restoring force of the first elastic means; And a front end side that is constrained by a coupling hole formed in any one of the first base part and the second base part, and a moving space is formed inside and radially outward along a circumferential direction at the edge of the opened front end. The main body portion is formed with a protruding locking protrusion, a cylinder portion filled with a working fluid providing buffer force therein, and inserted into the front end portion of the main body portion, but with a cylinder hole formed at the rear end portion and a rear end portion inside the rear end portion of the main body portion. It is fixed but is provided between a rod portion provided with a piston portion at a front end portion disposed inside the cylinder portion through the insertion hole, and an inner rear end portion of the main body portion and an outer rear end portion of the cylinder portion, wherein the front end portion of the cylinder portion is the main body. Provided is a buffer hinge device for a hinged door, including a buffer support device including a second elastic means for providing elastic restoring force so as to protrude outwardly from an opened front end of the part.

Here, the coupling hole is formed to be inclined and expanded in diameter toward one of the first base portion and the second base portion, and the locking protrusion is a radius along the circumferential direction of the opened front end portion of the body portion Protruding outward in the direction, it is preferable that the diameter is expanded and formed to be inclined toward the front end so as to be substantially shaped when the engaging hole is constrained.

Further, at least one fitting protrusion is formed on the outer circumferential front end portion of the main body portion along the circumferential direction from the rear side portion of the locking protrusion, and protrudes radially outward at a predetermined interval along the circumferential direction. At least one locking hole formed radially through the front and rear directions of the main body portion at the rear side of the outer circumference, and at least one locking stone extending radially outward to be engaged with the locking hole at the rear end side of the cylinder portion. It is preferred that groups are formed.

Through the above solution, the present invention provides the following effects.

First, only the body part of the buffer support device is fixed to the receiving groove formed in any one of the door and the door frame simply and quickly by a fitting protrusion formed in a plurality of places at predetermined intervals along the circumferential direction on the outer circumference without a separate adhesive means. As the installation of the product is completed, it is possible to improve work convenience and economy.

Second, when drilling the receiving groove for inserting the buffer support device into either the door or the door frame, the drilling direction is guided by the coupling hole formed in one of the first base part and the second base part, so that the precise shape of the hole can be quickly Since it is formed, work convenience and manufacturing precision can be improved.

Third, the locking protrusion protruding obliquely to the edge of the front end portion of the main body of the shock absorbing device is locked by the engaging hole of the hinge part. Since the damage is prevented, the durability of the product can be significantly improved.

Fourth, the cylinder portion of the buffer support device is guided and guided as it is caught in the locking hole of the main body by a locking protrusion formed on the rear end side edge. This can be provided.

Fifth, since the buffer support device is arranged in correspondence with the direction in which the impact is applied when the door is rotated in the other direction, the buffer force through the working fluid can be substantially transmitted to the door and closed more smoothly. The excessive friction is prevented and the durability of the product can be significantly improved.

1 is a perspective view showing a buffer hinge device for a swing door according to an embodiment of the present invention.
Figure 2 is an exploded perspective view showing a buffer hinge device for a swing door according to an embodiment of the present invention.
Figure 3 is an exemplary view of the state of use of the buffer hinge device for the swing door according to an embodiment of the present invention viewed from the upper side.
4A and 4B are cross-sectional exemplary views showing a state in which a door is rotated in one direction by a buffer hinge device for a casement door according to an embodiment of the present invention.
5A and 5B are cross-sectional exemplary views showing a state in which the door is rotated in the other direction by a buffer hinge device for a casement door according to an embodiment of the present invention.
Figure 6 is a rear view as viewed from the rear end of the buffer hinge device for the swing door according to an embodiment of the present invention.
7 is a front view showing a state in which a portion of the first cam portion and the second cam portion of the buffer hinge device for a swing door according to an embodiment of the present invention is projected.
Figure 8 is a flow chart showing a construction method of a buffer hinge device for a swing door according to an embodiment of the present invention.

Hereinafter, a buffer hinge device for a hinged door and a construction method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a buffer hinge device for a swing door according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view showing a buffer hinge device for a swing door according to an embodiment of the present invention. And, Figure 3 is an exemplary view of the state of use of the buffer hinge device for a swing door according to an embodiment of the present invention from the upper side, Figures 4a and 4b is a buffer hinge device for a swing door according to an embodiment of the present invention Is an exemplary cross-sectional view showing a rotated state in one direction. And, Figures 5a and 5b is a cross-sectional view showing a state in which the buffer hinge device for a swing door according to an embodiment of the present invention the door is rotated in the other direction, Figure 6 is a buffer for a swing door according to an embodiment of the present invention It is a rear view of the hinge device as viewed from the rear end. And, Figure 7 is a front view showing a state in which a part of the first cam portion and the second cam portion of the buffer hinge device for a hinged door according to an embodiment of the present invention, Figure 8 is for the casement according to an embodiment of the present invention It is a flow chart showing the construction method of the buffer hinge device.

1 to 8, the buffer hinge device 300 for a hinged door according to an embodiment of the present invention includes a first hinge part 310, a second hinge part 340, and automatic rotation return means 320. And a buffer support device 380.

Here, the first hinge portion 310 is provided including a first housing portion 311 and the first base portion 312. In detail, a first hollow 311a having a circular cross-section is formed in the first housing part 311 along the longitudinal direction, and the first base part 312 is radial in the first housing part 311. It rushes outward. At this time, the first base portion 312 is preferably provided in a plate shape that is coupled or fixed to any one of the door (d) and the door frame (f).

In addition, the second hinge part 340 is provided including a second housing part 341 and a second base part 342. In detail, a second hollow 341a having a circular cross-sectional shape is formed along the lengthwise direction in the second housing portion 341 so as to communicate with the first hollow 311a, and the second base portion 342 is The second housing part 341 is protruded outward in the radial direction. At this time, the second base portion 342 is preferably provided in a plate shape that is coupled or fixed to the other of the door (d) and the door frame (f).

That is, the first hinge part 310 and the second hinge part 340 are disposed such that the first hollow 311a and the second hollow 341a communicate in the longitudinal direction, thereby forming a rotating space A. do. Then, the first base portion 312 and the second base portion 342 are hinged so as to be adjacent to or spaced apart from each other about the automatic rotation return means 320 provided in the rotation space (A). Through this, the door (d) can be rotated to open or close in a hinged state to one side edge of the door frame (f).

Here, the lower end of the first hollow 311a and the upper end of the neighboring second hollow 341a are opened to communicate with each other, the upper end of the first hollow 311a and the lower end of the second hollow 341a Is preferably sealed. For example, as shown in the drawing, the upper end portion of the first hollow 311a and the lower end portion of the second hollow 341a may be covered by using detachable sealing caps 313 and 243. Accordingly, the automatic rotation return means 320 can be easily assembled and replaced inside the rotation space A, so that productivity and maintainability can be significantly improved. In addition, when the sealing caps 313 and 243 are combined, it is possible to prevent a malfunction when the automatic rotation return means 320 is driven, since the introduction of foreign substances into the rotation space (A) is prevented.

Hereinafter, the first hinge portion 310 is coupled to and rotated on the door d, and the second hinge portion 340 is continuously disposed at a lower end in the longitudinal direction of the first hinge portion 310, but the door frame A case where it is fixed by being coupled to (f) will be described as an example. In addition, hereinafter, one direction (R) is preferably understood as the direction in which the door (d) is opened, and the other direction (CR) is preferably understood as the direction in which the door (d) is closed.

On the other hand, the automatic rotation return means 320 is disposed in the rotation space (A), it is preferably provided with a first cam portion 330, the second cam portion 350 and the first elastic means 321. .

Here, the first cam portion 330 is disposed to be moved in the longitudinal direction on one side of the rotation space (A), it is preferable to include a first body portion 331 and the drive contact portion 332. At this time, that the first cam portion 330 is moved in the longitudinal direction, it is said that the first cam portion 330 is rotated with respect to the rotational rotation in the rotation space (A) with respect to the rotation axis is made only It is desirable to understand.

That is, as shown in the drawing, when the first hinge part 310 is coupled or fixed to the door d, the first cam part 330 is not rotated inside the rotation space A alone, and the first The hinge part 310 is interlocked and rotated but moved in the longitudinal direction. Alternatively, when the first hinge portion 310 is coupled to the door frame f, the first cam portion 330 is not rotated inside the rotating space A but is moved only in the longitudinal direction. Hereinafter, one side of the rotation space (A) is described and illustrated as the inside of the first hollow 311a.

In detail, the first cam part 330 is disposed inside the first hollow 311a, and has an inner circumferential diameter of the first housing part 311, that is, a cylinder corresponding to a cross-sectional shape of the first hollow 311a. It is preferably provided in a shape. In addition, the first cam portion 330 includes the drive contact portion 332 protruding to the other end side of the first body portion 331 side, a predetermined angle in one direction (R) side of the drive contact portion 332 It is preferable that the first inclined surface 332b inclined to be formed.

In addition, the second cam portion 350 is provided on the other side of the rotation space (A), it is preferable that it is provided, including a second body portion 351 and the rotation drive portion 352. Hereinafter, the other side of the rotation space (A) will be described and illustrated as a connecting portion in which the first hollow 311a and the second hollow 341a communicate.

In detail, the second body portion 351 is disposed inside the second hollow 341a, but is coupled to a coupling member 355 penetrating the second housing portion 341 and the second body portion 351 simultaneously. It is fixed to the second hinge portion 340 by. At this time, a fixing protrusion 341b and a fixing groove 351b may be formed on opposite surfaces between the outer circumference of the second trunk portion 351 and the inner circumference of the second hollow 341a. Through this, it is possible to prevent the second cam portion 350 from being interlocked with the first cam portion 330 while being fixed to the second hinge portion 340.

In addition, the rotation driving part 352 is provided on one end side of the second body part 351 and is disposed on the lower end side of the first hollow 311a. At this time, it is preferable that a second inclined surface 352b in sliding contact with the first inclined surface 332b is formed in the rotation driving part 352.

That is, the first inclined surface 332b and the second inclined surface 352b are in contact with each other, but when the door d is rotated in one direction (R) by an external force, the first inclined surface 332b is the second inclined surface Slide contact is moved along 352b.

At this time, since the first cam part 330 is disposed in a state in which the rotation is substantially constrained from the inside of the first hollow 311a, the first cam part 330 rotates interlocked with the first housing part 311, but inside the rotating space A Is moved only to one side and the other side.

It is preferable that the first cam part 330 is substantially interlocked and rotated when the door d is rotated, but is moved only in the longitudinal direction inside the first hollow 311a. Therefore, as the first inclined surface 332b slides to the second inclined surface 352b when one direction R of the door d is rotated, the first cam part 330 is one side of the rotating space A Can be moved to.

Then, the first elastic means 321 provided in the rotating space (A) is compressed while the other end side of the first body portion 331 and one end side of the second body portion 351 are spaced apart.

Here, the first elastic means 321 is preferably provided with a coil spring, it is preferably disposed between the closed side of the first cam portion 330 and the first hollow (311a). Through this, the first elastic means 321 may be compressed between the upper end portion of the first cam portion 330 and the first hollow 311a that are moved up and down to one side of the rotation space A.

In addition, when the external force that rotates the door d in one direction R is removed or a predetermined external force is applied to the other direction CR, the elastic recovery force of the compressed first elastic means 321 is the first cam portion. 330. Accordingly, the first cam portion 330 is moved to the other side to the rotation space (A), the first inclined surface 332b is automatically moved by sliding to the other direction (CR) side along the second inclined surface (352b) It can be driven to return to rotation.

That is, the first cam portion 330 is moved up and down in the direction of the rotation axis by pressing each of the inclined surfaces 332b and 252b formed on each cam portion 330 and 350 with each other, and then pressurizing the first elastic means 321 to be compressed. It can be automatically returned to rotation through the restoring force. Through this, even if the door (d) is operated in the other direction (CR) with a minimum force, it is driven to automatically close within a preset rotation angle range, so that the convenience of using the swing door can be significantly improved.

At this time, it is preferable that the rotation preventing protrusion 331b is protruded on one surface facing each other between the outer circumferential surface of the first cam portion 330 and the inner circumferential surface of the first hollow 311a. Further, it is preferable that the anti-rotation groove 311b is recessed to guide the movement of the anti-rotation protrusion 331b in the insertion and longitudinal direction.

Accordingly, the first elastic means 321 may be compressed while the first cam part 330 moves up and down only in the longitudinal direction without being idle inside the rotating space A. Through this, the pressing force of the first elastic means 321 provided to slide the first inclined surface 332b and the second inclined surface 352b to each other, that is, the elastic restoration force is accurately transmitted. Therefore, since the automatic rotation return means 320 is easily and automatically returned to rotation, driving reliability of the product can be remarkably improved.

Of course, if necessary, at least one de-cut portion is formed on the outer surface of the first cam portion 330, and a flat portion corresponding to the de-cut portion may be provided on the inner circumference of the first hollow 311a. It belongs to the scope of the present invention.

Meanwhile, referring to FIGS. 4A to 5A and 7, the second inclined surface 352b is a stepped surface 352a and an open surface 352c which are formed to be stepped with each other at one end of the second cam part 350. It is preferably arranged to be inclined upward in one direction (R) between. The second inclined surface 352b is preferably formed at an inclination angle corresponding to the first inclined surface 332b formed in one direction R side of the driving contact part 332.

In detail, the closed surface 352a is formed as a horizontal surface along a circumferential direction at one end of the rotation driving part 352. In addition, the open surface 352c is formed as a horizontal surface along the circumferential direction on the upper surface of the stepped portion 352d which protrudes stepwise from the closed surface 352a.

In addition, the driving contact portion 332 is disposed so that the end is in contact with the closed surface 352a in the closed state of the door d, but the second inclined surface 352b when rotating in one direction R of the door d ) After being moved along the slide and disposed on the open surface 352c. At this time, since the pressing force to the other end side is transmitted to the first cam part 330 by the elastic restoring force of the first elastic means 321, the end of the driving contact part 332 is in close contact with the open surface 352c In the friction stop and pressurized restraint. Through this, the open state of the door d may be maintained until a separate external force is applied.

Therefore, since the door (d) does not require a separate stopper or support device for fixing the open state, the operation convenience of the door (d) can be further improved, and the stopper member protruding around the door (d) Discomfort such as a user tripping can be prevented. In addition, since the driving contact portion 332 is frictionally stopped on the open surface 352c and rotation is limited, the door d can be prevented from being excessively opened in one direction R. Through this, damage and malfunction of the automatic rotation return means 320 are prevented, so that the service life of the product can be significantly extended.

On the other hand, in the related art, malfunctions and malfunctions frequently occurred because a cam member configured to be automatically closed was not provided with a separate means for limiting the rotation angle in one direction. That is, due to the fact that the cam protrusions protruding so as to be engaged with each other are rotated at a predetermined angle or more and are displaced, there is a problem in that they cannot be substantially rotated in the closing direction. Accordingly, the present invention discloses a structure for solving this problem.

In detail, to limit the rotation angle of one direction (R) of the second cam part 350, the stepped restriction protrusion 352e is brought into contact with the first inclined surface 332b at one end (R) side end of the open surface 352c. It is preferred that the rush. That is, the rotation driving unit 352 may be formed in a multi-stepped stepped shape with ends of the closed surface 352a, the open surface 352c, and the restriction protrusion 352e facing one side at predetermined intervals. Here, in the enlarged view shown on the left side of FIG. 4A, it is understood that the upper surface of the closed surface 352a, the open surface 352c, and the restriction protrusion 352e respectively represents a stepped shape. desirable.

Therefore, when the door (d) is rotated in one direction (R), the driving contact portion 332 is moved from the closed surface 352a along the second inclined surface 352b, and then disposed on the open surface 352c. . In addition, excessive rotation in one direction (R) is restricted as the end of the driving contact portion (332) is locked by the restriction protrusion (352e) protruding to one side at one end (R) of the open surface (352c). Can be.

That is, the driving contact portion 332, the friction force between the contact surfaces in the state disposed on the open surface (352c), the pressing force of the first elastic means 321 and the restriction protrusion (352e) through the locking constraint in one direction ( Rotation to R) is prevented. Therefore, the rotation angle of the door d may be limited to within a preset rotation angle range.

Accordingly, it is possible to prevent the driving contact part 332 from falling/hanging between the second stopper protrusion 354 and the second slope 352b, which will be described later, because the door d is rotated at a predetermined rotation angle or higher. have. Through this, the driving stability and driving reliability of the buffer hinge device 300 for the swing door can be significantly improved.

On the other hand, it is preferable that the first stopper protrusion 334 that protrudes in the other direction CR toward the end is formed on the other direction CR side of the driving contact part 332. In addition, it is preferable that the second cam portion 350 protrudes in a spiral direction in the second stopper protrusion 354 that is locked by the first stopper protrusion 334.

In detail, when the external force that rotates the door d in one direction R is removed or when a predetermined external force is applied to the other direction CR, the first cam portion is generated by the elastic restoration force of the first elastic means 321. 330) is pressed to the other side of the rotating space (A). Then, the first inclined surface 332b and the second inclined surface 352b slide contact with each other while the driving contact part 332 descends to the other side of the rotation space A.

At this time, the first cam portion 330 is provided to be substantially interlocked with the first hinge portion 310 through the anti-rotation protrusion 331b and the anti-rotation groove 311b. Thus, as the first inclined surface 332b slides obliquely along the second inclined surface 352b, rotational force to rotate the first cam part 330 is substantially transmitted to the first hinge part 310, thereby returning to rotation. And the door (d) is closed.

In addition, when the other direction CR of the door d is rotated, the first stopper protrusion 334 and the second stopper protrusion 354 are adjacent to each other, but are constrained to face each other of the stopper protrusions 334 and 354. Rotation in the other direction (CR) is restricted while being inserted into the surfaces (334b, 354b).

At this time, each of the restraining surfaces 334b and 354b is formed of a profile corresponding to the protruding outer surfaces of each of the stopper protrusions 334 and 354. Therefore, the first stopper protrusion 334 and the second stopper protrusion 354 are precisely matched to the insides of the restraining surfaces 334b and 354b when the automatic rotation return means 320 returns to rotation. Through this, even if the door (d) is repeatedly opened and closed, wear or damage of each component is minimized, and the rotation angle is precisely constrained, so that the driving reliability and driving stability of the product can be significantly improved.

Here, the first stopper protrusion 334 and the agent when rotating in one direction (R) such that the end of the driving contact portion 332 is located on the stepped upper side of the second inclined surface 352b, that is, the open surface 352c It is preferable that the ends of the two stopper protrusions 354 face each other. To this end, the vertical spacing in which the second stopper protrusion 354 protrudes from the closing surface 352a to one side is a vertical spacing between the lower and upper sides of the second inclined surface 352b, that is, the closing surface 352a. ) And is set to exceed the vertical distance between the open surfaces 352c.

Moreover, the protruding end of the second stopper protrusion 354 is preferably formed to correspond to the protruding end of the restriction protrusion 352e. Therefore, each end of the first stopper protrusion 334 and the second stopper protrusion 354 may face each other while the drive contact portion 332 is disposed on the open surface 352c.

Accordingly, when the door (d) is rotated in the other direction (CR), the first stopper protrusion 334 and the second stopper protrusion 354 are adjacent to each other, and each end is engaged with each other and the restraining surface 334b of each other ,354b). Through this, the automatic rotation return means 320 is prevented from being excessively rotated to the other direction (CR), thereby preventing abrasion or damage of the product, and driving reliability of the product can be significantly improved.

In addition, between the first hinge portion 310 and the second hinge portion 340, and between the second cam portion 350 and the lower end of the first hollow 311a, wear prevention rings 371 and 372 are provided, respectively. It is desirable.

That is, since a separate wear prevention ring 371,372 is disposed on a portion that is repeatedly rubbed when the hinge of the automatic rotation return means 320 is rotated, it is possible to prevent a play due to wear of each cam part 330,350. , The service life of the product can be significantly extended.

On the other hand, the buffer support device 380 is coupled to any one of the first base portion 312 and the second base portion 342, the body portion 381, the cylinder portion 382, the rod portion 383 ) And the second elastic means (384) is preferably provided.

Here, the buffer support device 380 is preferably disposed vertically with the automatic rotation return means 320, and is disposed in a direction corresponding to a direction in which an impact is applied when rotating in the other direction (CR) of the door (d). This is preferred.

In detail, the buffer support device 380 has a front end portion protruding between the first base portion 312 and the second base portion 342 when the automatic rotation return means 320 is returned to rotation. A buffer force is provided by a working fluid that flows while being pressed against an opposite surface of any one of the door frames (f).

Here, it is preferable that the coupling hole 342a is formed through one of the first base portion 312 and the second base portion 342 so that the main body portion 381 is locked. In addition, one of the door (d) and the door frame (f) corresponding to the position of the coupling hole (342a) is formed in the receiving groove (fa) is perforated by a separate drill device or the like, the receiving groove ( fa) is preferably guided and formed by the coupling hole 342a.

At this time, when the buffer support device 380 is coupled to the second base portion 342, it is preferable that the receiving groove fa in which the buffer support device 380 is interpolated is formed in the door frame f. . Of course, in some cases, the buffer support device 380 may be coupled to the first base portion 312, in which case the receiving groove may be formed in the door d. Hereinafter, a case where the buffer support device 380 is coupled to the second base portion 342 and the receiving groove fa is formed in the door frame f is described and illustrated as an example.

On the other hand, the main body portion 381 is provided in a cylindrical shape or the like and is formed in an outer circumferential diameter corresponding to the coupling hole 342a formed in the second base portion 342, and a moving space inside the front end side opening It is formed. At this time, it is preferable to understand that the front end side of the main body portion 381 is a portion that is engaged with the coupling hole 342a.

Here, the opening of the front end portion of the main body portion 381 extends radially outward along the circumferential direction and engages substantially with the coupling hole 342a as it is constrained by the edge of the coupling hole 342a. It is preferable that the protrusions 381a are formed.

In addition, the engaging protrusion 381a is preferably formed to protrude radially outward along the circumferential direction with a predetermined thickness in the front-rear direction from the edge of the opened front end of the body portion 381.

In addition, it is preferable that the engaging protrusion 381a is formed to be inclined and expanded in diameter toward the front end of the main body 381. That is, it is preferable that the end portion of the engaging protrusion 381a is formed in the form of an inclined surface extending radially outward toward the front end of the body portion 381.

At this time, the diameter of the rim of the coupling hole 342a corresponds to the shape of the locking protrusion 381a, and it is preferable that the diameter of the body portion 381 is expanded to be inclined toward the front end. That is, it is preferable that the inner circumference of the coupling hole 342a is formed in an inclined surface shape extending radially outward toward the front end of the main body 381.

Here, when the main body portion 381 is inserted from the front end portion to the rear end side of the coupling hole 342a, the inclined surfaces of the locking protrusions 381a and the coupling hole 342a are in close contact with each other and the main body portion ( 381) is preferably locked.

Moreover, when the engaging protrusion 381a is completely inserted into the engaging hole 342a, the engaging protrusion 381a and the first base portion 312 and the second base on which the engaging hole 342a are formed. It is preferable that the outer surface profile of any one of the portions 342 is formed as a substantially continuous surface.

Through this, the end side of the buffer support device 380 in the closed state of the door (d) collides with the edge surface (da) of the door (d) is excessively inserted into the receiving groove (fa) side Can be prevented.

Therefore, the locking protrusions 381a formed obliquely on the edge of the front end of the main body portion 381 of the buffer support device 380 are locked in the engaging hole 342a and closed in the closed state of the door d. Since the damage of the buffer support device 380 due to excessive pressure insertion due to a collision between the end surface of the buffer support device 380 and the edge surface of the door d is prevented, the durability of the product can be significantly improved.

Moreover, since the outer surface profile of any one of the engaging protrusion 381a of the main body portion 381 and the first base portion 312 and the second base portion 342 is formed as a substantially continuous surface, aesthetics can be improved. Can. In addition, an outer surface profile of any one of the first base portion 312 and the second base portion 342 is formed as a substantially continuous surface to expose the front end side of the body portion 381 when the door d is closed. The installation precision of the product can be improved since the door (d) facing one of the first base part (312) and the second base part (342) is in close contact with each other. That is, unlike the conventional front end portion of the damping device protruding from the hinge, an outer surface profile of any one of the engaging protrusion 381a, the first base portion 312 and the second base portion 342 is formed as a substantially continuous surface. It is desirable to understand that there are differences.

In addition, at least one fitting protrusion protruding radially outward at a predetermined interval along a circumferential direction extending from the rear side of the locking protrusion 381a to the outer circumferential front end side of the main body portion 381 along a circumferential direction. It is preferable that (381b) is formed.

Here, it is preferable that the fitting protrusion 381b is provided to provide a mutually fastening force between the outer circumference of the main body portion 381 and the inner circumference of the receiving groove fa, and the circumferential length becomes tapered toward the radially outer side. It can be formed in a reduced form.

In addition, the fitting projection 381b may be reduced inclined in the radial length toward the rear end from the front end of the main body portion 381 so that the pressing force increases when the main body portion 381 is inserted into the receiving groove fa. have.

Accordingly, the body portion 381 having at least one of the fitting protrusions 381b along the outer circumference on the front end side is formed in the receiving groove fa formed in any one of the door d and the door frame f. Can be easily fitted and fixed. Moreover, rotation of the main body portion 381 inserted into the receiving groove fa by the fitting protrusion 381b is prevented, and durability can be improved.

Therefore, the receiving groove formed in any one of the door (d) and the door frame (f) by the fitting protrusion 381b, the body portion 381 of the buffer support device 380 without a separate adhesive means ( Since it is easily fitted and fixed to fa), work convenience can be significantly improved. Of course, in some cases, it is also possible to apply a separate adhesive means between the outer periphery of the main body portion 381 and the inner periphery of the receiving groove fa so that the bonding force is improved.

In addition, the moving space of the inner periphery of the main body portion 381 is recessed along the front-rear direction to be easily inserted upon initial insertion of the engaging projection 382a to be described later, but at least one guide groove 381d is formed along the circumferential direction. Can be.

Moreover, the opened front end side edge of the moving space may be formed to be tapered in diameter toward the front end of the main body part 381 so that the cylinder part 382 is easily inserted and friction is reduced.

And, the rear end of the main body portion 381 is preferably fitted and fixed to the receiving groove (fa), the length in the front-rear direction of the main body portion 381 and the depression depth of the receiving groove (fa) are substantially correspond to each other It is preferably formed.

In addition, a cap member 386 may be integrally provided at a rear end of the main body 381. Of course, in some cases, the main body portion 381 is also opened at the rear end portion, but may be covered by a separate cap member 386. Through this, it is easy to assemble and replace each component disposed therein, so that productivity and maintainability can be significantly improved.

In addition, it is preferable that at least one locking hole 381c formed in the radial direction along the front-rear direction of the main body portion 381 is formed in a rectangular shape on the rear side of the outer periphery of the main body portion 381. At this time, in the exemplary embodiment of the present invention, a description will be given of a case in which the engaging hole 381c and the engaging protrusion 382a are provided as a pair, respectively.

Here, it is preferable that the engaging hole 381c is formed in a rectangular shape and is disposed long along the front-rear direction of the main body portion 381. That is, the locking hole 381c is formed in a first length along the front-rear direction of the main body portion 381, but is formed in a second length in the circumferential direction of the main body portion 381, and the first length is the It is preferred to exceed the second length.

On the other hand, the cylinder portion 382 is provided in a cylindrical shape or the like, but is inserted into the opened front end portion of the body portion 381, and is preferably provided as an outer circumference corresponding to the inner circumference of the body portion 381.

Here, it is preferable that a locking protrusion 382a extending radially outward is formed at the rear end side edge of the cylinder portion 382 to be engaged with the locking hole 381c. At this time, the engaging projection 382a is provided with a length corresponding to the second length of the engaging hole 381c along the circumferential direction, and is preferably provided with a length less than the first length along the front-rear direction.

Accordingly, when the front end of the cylinder portion 382 is pressed against any one of the door (d) and the door frame (f), the locking projections 382a move to the rear end of the locking hole 381a. Can be. On the other hand, when the pressurization of the front end of the cylinder portion 382 is released, the cylinder portion 382 is elastically restored and moved forward by the second elastic means 384, but the locking protrusion 382a is the locking hole ( 381a), the movement may be limited as it is caught in the front end portion.

Therefore, the cylinder portion 382 is guided and moved forward and backward as the locking projections 382a are caught by the locking holes 381a, but when the door d is closed, the cylinder portion 382 front end portion is excessive. Stable damping function may be provided because jamming due to protrusion is prevented.

In addition, the working fluid is filled in the cylinder portion 382 and an insertion hole 382c is formed at the rear end side. At this time, it is preferable that the outer circumferential diameter of the cylinder portion 382 corresponds to the inner circumferential diameter of the main body portion 381, and wear due to friction is minimized when the cylinder portion 382 moves in the front-rear direction of the moving space. It is preferably formed to a diameter that can.

Here, as the cylinder portion 382 is moved in the front-rear direction while being inserted into the body portion 381, it is possible to prevent the working fluid from flowing out of the door frame f.

In addition, it is preferable that the front end of the cylinder portion 382 is provided with a buffer head portion 382b. Through this, even if the edge surface (da) of the door (d) facing the front end side of the buffer support device 380 collides with the cylinder part 382, the impact transmitted to the buffer support device 380 Since it is minimized, the durability of the product can be significantly improved.

And, the rod portion 383 is preferably a rear end portion is fixed to the inner rear end portion of the main body portion 381, the front end portion is disposed inside the cylinder portion 382 through the insertion hole 382c. At this time, the front end of the rod portion 383 is provided with a piston portion 385, the piston portion 385 is a fluid moving groove (not shown) along the outer periphery corresponding to the inner circumference of the cylinder portion 382. At least one may be formed in the front-rear direction.

In addition, the second elastic means 384 is preferably provided between the inner rear end of the body portion 381 and the outer rear end of the cylinder portion 382. The second elastic means 384 provides elastic recovery force so that the front end of the cylinder portion 382 protrudes toward the front end of the opened front end of the body portion 381.

Therefore, the front end of the cylinder portion 382 is disposed to protrude between the first base portion 312 and the second base portion 342 by the elastic restoration force of the second elastic means 384. And, when the door (d) is rotated in the other direction (CR), the cylinder portion 382 faces any one of the door (d) and the door frame (f), in this embodiment the door (d) It is pressed to the rear end side while colliding with the edge surface (da) of.

On the other hand, in the open state of the door (d), the opposite edges of the door (d) and the door frame (f) are spaced apart from each other, and the cylinder portion 382 is formed by the elastic restoring force of the second elastic means 384. ), the front end portion protrudes between the first base portion 312 and the second base portion 342. Further, the piston portion 385 is located at the inner rear end of the cylinder portion 382, and the working fluid is located on the left side of the piston portion 385, that is, on the front end side of the cylinder portion 382.

At this time, when the door (d) is rotated in the other direction (CR), the edge of the door (d) is adjacent to the door frame (f) side and presses the protruding cylinder portion 382 to the rear end side. At this time, while the cylinder portion 382 is pressed toward the rear end portion, the position of the piston portion 385 is relatively changed to the inner front end portion of the cylinder portion 382. Here, since the working fluid is an incompressible fluid, in this process, the working fluid is moved to the right side of the cylinder part 382 through the fluid moving groove (not shown), that is, to the rear end side of the cylinder part 382.

In addition, as the working fluid moves through the fluid moving groove (not shown), the speed change at the time of impact of the door (d) is attenuated through the turbulence resistance (resistance proportional to the square of the speed), so the automatic rotation return Sudden rotation return of the means 320 can be prevented.

Therefore, even if an excessive external force is applied to the door d in the other direction CR, damage to the door d or the buffer hinge device 300 due to an impact can be prevented. In addition, a safety accident such as a user's finger or a body part being caught while the door d is suddenly closed may be prevented.

On the other hand, when the door (d) is opened again, the front end of the cylinder portion 382 by the elastic restoring force of the second elastic means 384, the first base portion 312 and the second base portion ( 342). Through this, even if the door (d) is repeatedly opened and closed, the buffer support device 380 can be returned to a position capable of cushioning the rotational speed and impact when the door (d) is closed at all times.

Moreover, it is preferable that the elastic recovery force of the first elastic means 321 is set larger than that of the second elastic means 384. Therefore, as the first cam unit 330 is pressed through the elastic restoration force of the first elastic means 321, the force that the automatic rotation return means 320 rotates and returns is the elastic restoration force of the second elastic means 384. Through the cylinder portion 382 acts larger than the projecting force.

Through this, although the force to press the cylinder portion 382 toward the front end portion of the second elastic means 384 is always applied, the door d through the elastic recovery force of the first elastic means 321 The automatic closing of can be made stably.

On the other hand, in the present embodiment, the first hinge portion 310 is coupled to the door (d) and the second hinge portion 340 is described as being coupled to the door frame (f), but the first hinge portion ( 310) may be coupled to the door frame (f) and the second hinge portion 340 may be coupled to the door (d).

Here, when the second hinge portion 340 is coupled to the door d, the second cam portion 350 may be rotated interlocked with the door d. At this time, the first cam portion 330 may be restricted in rotation so as to move only in the longitudinal direction of the rotating space A from the inside of the first hollow 311a.

In addition, the buffer support device 380 may also be coupled to a hinge portion coupled to the door (d), and such modifications are within the scope of the present invention.

Through this, the buffer hinge device 300 for the hinged door according to the present invention is within the rotational angle range in which the first cam part 330 and the second cam part 350 which are cam-driven in the rotation space A are preset. The first elastic means 321 is returned to rotation through the elastic restoration force.

Therefore, since the door (d) to which the product is coupled is automatically closed, the usability is significantly improved, and the rotational speed of the door (d) can be attenuated through the buffer support device (380). Through this, it is possible to prevent a safety accident such as a finger jamming while minimizing noise generated by an impact when the door d is closed.

In addition, it is constrained that the first cam portion 330 rotates at a predetermined rotational angle or more as the restriction protrusion 352e protrudes at one end of the open surface 352c formed in the second cam portion 350. Through this, the drive contact part 332 protruding from the other end of the first cam part 330 is incorrectly inserted between the second slope 352b and the second stopper protrusion 354 of the second cam part 350. It is possible to prevent malfunction or damage of the product.

In addition, since the buffer support device 380 is disposed corresponding to a direction in which an impact is applied when the door d is rotated in the other direction, the buffer force through the working fluid is substantially transmitted to the door d. Through this, the door (d) can be closed more smoothly, and the durability of the product can be significantly improved by preventing the automatic rotation return means (320) from being excessively rubbed.

On the other hand, the construction method of the buffer hinge device for the hinged door according to an embodiment of the present invention is the first hinge portion 310, the second hinge portion 340, the automatic rotation return means 320 are mutually coupled and prepared (s10), the first base portion 312 of the first hinge portion 310 is coupled to any one of the door (d) and the door frame (f) and the agent of the second hinge portion 340 2 Base portion 342 is coupled to the other of the door (d) and the door frame (f) (s20), perforated the receiving groove (fa) in any one of the door (d) and the door frame (f) ( s30), the buffer support device 380 includes a series of steps of fitting (s40) into the receiving groove (fa).

In detail, the first hinge portion 310, the second hinge portion 340, and the automatic rotation return means 320 are mutually coupled and prepared (s10). At this time, the first hinge portion 310 is formed with the first hollow 311a, the first housing portion 311 and the first housing portion 311 protruding radially outward of the first base portion 312 ) Is preferably provided. In addition, the second housing portion 341 having the second hollow 341a formed in the second hinge portion 340 to communicate with the first hollow 311a in the longitudinal direction to form the rotation space A is formed. And it is preferable that the second base portion 342 protruding outward in the radial direction of the second housing portion 341 is provided.

In addition, the automatic rotation return means 320 is disposed to be moved in the longitudinal direction on one side of the rotation space (A) and includes the drive contact portion 332 formed with the first inclined surface 332b inclined at a predetermined angle. The second cam portion 350 is provided on the other side of the first cam portion 330 and the rotating space (A) and in sliding contact with the first inclined surface 332b corresponding to the rotation direction of the door (d) It is preferable that the first cam unit 330 is driven to be returned to rotation while being pressed by the elastic restoring force of the first elastic means 321 provided in the rotating space A.

Of course, each cam portion 330, 350 may be provided with at least one or more, and in some cases, each cam portion 330, 350 is provided as one to mediate connection between the first hinge portion 310 and the second hinge portion 340. It may be provided to provide only the rotating shaft function.

And, the first base portion 312 is screwed to any one of the door (d) and the door frame (f), the second base portion 342 is the door (d) and the door frame (f) It is screwed to the other of (s20).

At this time, a plurality of screw holes may be formed through the first base part 312 and the second base part 342, respectively, and the first base may be formed by screws (not shown) that penetrate each screw hole. The part 312 and the second base part 342 may be fixed to the door d and the door frame f.

Subsequently, the receiving groove (fa) is perforated by a separate drilling device or the like in any one of the door (d) and the door frame (f), the receiving groove (fa) is the first base portion 312 and the It is guided and formed by the coupling hole 342a formed in any one of the second base portions 342 (s30).

Here, when the drill device (not shown) provided for forming a hole drills any one of the door (d) and the door frame (f) corresponding to the position of the coupling hole (342a), the drill device (not shown) Shi) is guided by the coupling hole 342a and preferably includes the step of forming the receiving groove fa.

For example, when the second base portion 342 on which the coupling hole 342a is formed is coupled to the door frame f, a separate drill device is guided through the coupling hole 342a and is attached to the door frame f. The receiving groove fa can be drilled. At this time, the receiving groove (fa) is preferably formed over the length in the front-rear direction of the main body portion 381, preferably perforated with an inner diameter corresponding to the outer diameter of the main body portion 381.

Accordingly, the first base portion 312 and the second when drilling the receiving groove (fa) for the insertion of the buffer support device 380 in any one of the door (d) and the door frame (f) Since the perforation direction is guided by the coupling hole 342a formed in any one of the base parts 342, the perforation of a precise shape is quickly formed, and thus work convenience and manufacturing precision can be improved.

Then, as the buffer support device 380 passes through the coupling hole 342a and is fixed to the receiving groove fa, the buffer hinge device 300 for the casement door is finally constructed (s40).

Here, at least one of the fitting protrusions 381b protruding radially outward at a predetermined distance along the circumferential direction on the outer circumferential front end side of the main body part 381 is fixed to the fitting groove fa. It is preferred to include.

Therefore, the receiving groove formed in any one of the door (d) and the door frame (f) by the fitting projection 381 b of the body portion 381 of the buffer support device 380 without a separate adhesive means ( Since the installation of the product is completed simply by simply and quickly fitting it into the fa), work convenience and economic efficiency can be remarkably improved.

In addition, the buffer support device 380 is disposed vertically to the automatic rotation return means 320, but when the rotation of the automatic rotation return means 320 returns, the first base part 312 and the second base part ( It is preferable that the front end projecting between 342) is provided to provide a buffering force by the working fluid flowing while being pressed against the opposite surface of either the door (d) or the door frame (f).

Therefore, since the buffer support device 380 is disposed corresponding to the direction in which the impact is applied when rotating the other direction CR of the door d, the buffer force through the working fluid is substantially transmitted to the door d, and further It can be closed smoothly, and the durability of the product can be significantly improved by preventing the automatic rotation return means 320 from being excessively rubbed through attenuation of the rotational speed.

At this time, the terms "include", "compose", "have" or "have" as described above mean that the corresponding component can be intrinsic, unless otherwise stated. It should be construed that other components may be included rather than excluded. All terms, including technical or scientific terms, have the same meaning as generally understood by a person skilled in the art to which the present invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted as being consistent with the contextual meaning of the related art, and are not to be interpreted as ideal or excessively formal meanings unless explicitly defined in the present invention.

As described above, the present invention is not limited to each of the above-described embodiments, and it is possible to be modified by a person skilled in the art to which the present invention pertains without departing from the scope of the claims of the present invention. And, such modifications are within the scope of the present invention.

300: shock absorber hinge device 310: first hinge
320: automatic rotation return means 321: first elastic means
330: first cam portion 332: drive contact portion
332b: first slope surface 334: first stopper protrusion
340: second hinge portion 350: second cam portion
352: rotary driving unit 352a: closed surface
352b: second inclined surface 352c: open surface
354: second stopper projection 380: buffer support device
381: main body portion 381a: jam protrusion
381b: Insertion 381c: Hanging hole
382: cylinder portion 382a: locking projection
383: rod portion 384: second elastic means

Claims (5)

A first hinge portion provided with a first housing portion in which a first hollow is formed and a first base portion protruding radially outwardly of the first housing portion, and a second portion communicating with the first hollow in a longitudinal direction to form a rotating space An automatic rotation return means including a second hinge part provided with a second housing part having a hollow and a second base part protruding radially outwardly from the second housing part, and at least one cam part disposed in the rotation space The first step is combined and prepared;
A second step in which the first base portion is coupled to any one of the door and the door frame, and the second base portion is coupled to the other one of the door and the door frame;
A third step in which an accommodating groove is perforated in one of the door and the door frame, the accommodating groove being guided and formed by a coupling hole formed in one of the first base part and the second base part; And
It is disposed vertically to the automatic rotation return means, the front end protruding between the first base portion and the second base portion when the rotation of the automatic rotation return means is rotated while being pressed against an opposite surface of either the door or the door frame A method of constructing a buffer hinge device for a hinged door, comprising a fourth step in which a buffer support device that provides a buffer force by a working fluid is fitted into the receiving groove. According to claim 1,
In the third step, when a drill device provided for forming a hole punches any one of the door and the door frame corresponding to the position of the coupling hole, the drill device is guided by the coupling hole and forms the receiving groove The steps include,
The fourth step includes the step of fixing at least one fitting protrusion protruding radially outward at a predetermined distance along a circumferential direction on the outer circumferential front end side of the main body portion of the buffer support device. Construction method of a buffer hinge device for a swing door, characterized by. A first hinge portion provided with a first housing portion having a first hollow and a first base portion protruding radially outwardly of the first housing portion and coupled to any one of a door and a door frame;
A second housing part in which a second hollow is formed in the longitudinal direction communicating with the first hollow to form a rotating space, and a second housing protruding radially outside the second housing part and coupled to the other of the door and the door frame A second hinge portion provided with a base portion;
Automatic rotation return means including at least one cam portion and a first elastic means disposed in the rotating space, the rotation return to rotation by the elastic restoring force of the first elastic means; And
The front end side which is constrained by a coupling hole formed in any one of the first base part and the second base part is opened, a moving space is formed inside, and radially outwardly protrudes along the circumferential direction on the edge of the opened front end. The main body portion is formed with a locking protrusion, a working fluid that provides a buffer force therein, is inserted into the front end portion of the main body portion, and the cylinder portion is formed with an insertion hole at the rear end side, and the rear end portion is fixed to the inner rear end portion of the main body portion. However, it is provided between the rod portion provided with a piston portion in the front end disposed inside the cylinder portion through the insertion hole, the inner rear end portion of the main body portion and the outer rear end portion of the cylinder portion, the front end portion of the cylinder portion is the main body portion A shock absorbing hinge device for a hinged door, comprising a shock absorbing device including a second elastic means for providing elastic restoring force so as to protrude outside the opened front end. The method of claim 4,
The coupling hole is formed by extending the inclined diameter toward the front end to either one of the first base portion and the second base portion,
The engaging protrusion protrudes radially outward along the circumferential direction to the edge of the opened front end portion of the main body, for a hinged door characterized in that the diameter extends and extends toward the front end so as to be substantially shaped when the engaging hole is constrained. Buffer hinge device. The method of claim 4,
At least one fitting protrusion is formed on the outer circumferential front end portion of the main body portion along the front and rear direction from the rear side portion of the locking protrusion, and protrudes radially outward at a predetermined interval along the circumferential direction,
At least one locking hole formed in the radial direction along the front-rear direction of the main body portion is formed in the rear side of the outer periphery of the main body portion,
A buffer hinge device for a hinged door, characterized in that at least one locking protrusion extending radially outwardly is formed at the rear end side edge of the cylinder portion so as to be engaged with the locking hole.

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