Hinge structure for swing door

Abstract

The present invention relates to a hinge structure for a swing door, comprising: a door frame; a door that opens and closes an opening of the door frame; an upper hinge casing fixedly attached to the upper side of the side of the door; a lower hinge casing fixedly attached to the lower side of the side of the door; a lower hinge installed with at least part thereof inserted into the lower hinge casing, which generates a restoring force so as to close the door when an external force for opening the door is removed during opening of the door; and an upper hinge which is installed with at least part thereof inserted into the upper hinge casing, and which controls a restoring operation in which the door is closed by the restoring force when the door is being closed.

Description

Hinge structure of a swing door

[0001] The present invention relates to a hinge structure of a swing door, and more specifically, to a hinge structure of a swing door capable of controlling a restoring action of a door leaf to close when an external force that opens the door leaf is removed during opening of the swing door leaf, and a restoring force is applied in the direction of closing the door leaf.

[0002] Many swing doors have been proposed and are being used in which, when the external force that causes the door leaf to open is removed during the opening process of the swing door, a restoring force is applied in the direction in which the door leaf closes, causing the door leaf to close automatically.

[0003] For a swing door having such an automatic return function, the inventor of the present invention proposed a swing door return device including a door return assembly on the upper side of the door frame that automatically returns the door to the closed position in Patent Registration No. 10-2255003.

[0004] The above device has a significant advantage in the function of automatically returning the door to the closed position, but since the door return assembly is composed of a hydraulic device, operational problems occur after a certain period of time, making maintenance difficult.

[0005] Accordingly, the inventor of the present invention proposed a hinge structure of a folding door having an automatic return function of the door leaf using only mechanical force without using the above-mentioned hydraulic device in registered patent no. 10-2211918.

[0006] The invention above compresses a spring installed at the bottom of a linkage cam ring by the action of a fixed cam ring and a linkage cam ring when a user opens a door, and when the external force for opening the door is removed, the compressed spring is restored, and the door closes automatically with the restoration of the spring, thereby enabling a door in a fully open state to be quickly moved to a fully closed position without much force, while solving the maintenance problems of the prior art.

[0007] However, in the above invention, when the external force that opens the door is removed, the compressed spring is restored, and in this restoration process, the restoration is slow at first and then gradually accelerates, and the acceleration is maximum when the door reaches the door frame, and thereafter, the process of swinging back and forth around the door frame is repeated until the door closes on the door frame. Therefore, the automatic closing process of the door is not smooth, and there is a need for improvement in the process of closing the door. Furthermore, there is a concern that if the user carelessly places his or her fingers between the door and the door frame during the closing process, the fingers or the like may be injured if they are caught between the door and the door frame.

[0008] In order to solve the above problem, the inventor of the present invention proposed a hinge structure of a swing door in which a lower hinge is additionally installed on the lower side of the door leaf, which can reduce the size of the restoring force when the door leaf is closed when the external force that opens the door leaf is removed during opening of the swing door leaf, and the restoring force acts in the direction of closing the door leaf.

[0009] The above invention effectively reduces the size of the restoring force when the door is closed by the action of the lower hinge, thereby allowing the door to close slowly. However, depending on the installation site of the swing door, that is, if the door size is not predetermined or depending on the user's request, there was a problem in that the size of the restoring force for closing the door could not be reduced as desired by the user.

[0010] The present invention has been proposed to solve the problems of the conventional swing door as described above, and the purpose of the present invention is to provide a hinge structure of a swing door that, when an external force that opens the door leaf is removed while the swing door leaf is being opened, causes a restoring force to act in the direction in which the door leaf closes, and the door leaf closes more slowly than when it is closed by the restoring force.

[0011] In addition, another object of the present invention is to provide a hinge structure for a swing door that can be installed by immediately adjusting the closing motion of the door on site when a restoring force is applied in the direction of closing the door when an external force that opens the door is removed during the opening of the swing door, even if the door size is not predetermined or there is a request from the user.

[0012] In addition, another object of the present invention is to provide a hinge structure for a swing door that can be installed by simply adjusting the installation positions of the upper fixed cam ring and the upper linkage cam ring at the installation site of the swing door, thereby adjusting the point in time at which the restoring force begins to decrease when the door leaf is closed by the restoring force.

[0013] In addition, another object of the present invention is to provide a hinge structure for a swing door that allows the user to reduce the size of the door closing restoring force as desired, depending on the installation site of the swing door, that is, when the door size is not predetermined or depending on the user's request.

[0014] In addition, another object of the present invention is to provide a hinge structure for a swing door that allows a user to easily adjust the degree to which the restoring force applied in the closing direction of the door is reduced as needed when the door leaf is closed by applying a restoring force in the closing direction even after the door leaf of the swing door has been installed in the door frame, thereby controlling the closing speed of the door leaf.

[0015] In addition, another object of the present invention is to provide a hinge structure for a swing door that temporarily stops the closing motion of the door when a restoring force is applied in the closing direction of the door leaf to close the door leaf, thereby temporarily stopping the closing motion of the door leaf.

[0016] In addition, another object of the present invention is to provide a hinge structure for a swing door that prevents the door from closing at an abrupt rate when the door approaches the door frame when closing the swing door, thereby allowing the door to close without shaking as it slowly approaches the door frame.

[0017] In order to achieve these objects, the present invention comprises: a door frame; a door leaf rotatably installed on one side of the door frame to open and close an opening of the door frame; an upper hinge casing fixedly attached to an upper side of the door leaf and having a plurality of grooves formed longitudinally and spaced apart from each other inside; a lower hinge casing fixedly attached to a lower side of the door leaf and having a plurality of grooves formed longitudinally and spaced apart from each other inside; a lower hinge at least partially fitted into the interior of the lower hinge casing and rotatably supporting a lower portion of the door leaf with respect to the door frame when the door leaf rotates, and generating a restoring force to close the door leaf when an external force for opening the door leaf is removed while the door leaf is being opened; And it is characterized by including an upper hinge which is installed by being fitted at least partially inside the upper hinge casing, and rotatably supports the upper part of the door leaf with respect to the door frame when the door leaf rotates, and controls the restoring motion of the door leaf closing by the restoring force when the door leaf is closed.

[0018] The upper hinge preferably includes: an upper hinge shaft member that is fixedly installed and inserted into the interior of the upper hinge casing in an axial direction so as not to rotate relative to the upper door frame of the door frame; an upper fixed cam ring that is fixedly installed around the circumference of the upper hinge shaft member so as not to rotate relative to the upper hinge shaft member and inserted into the interior of the upper hinge casing; an upper linkage cam ring that is inserted into the interior of the upper hinge casing so as to be able to be raised and lowered and rotated at a lower portion of the upper fixed cam ring and that descends in the longitudinal direction of the upper hinge shaft member while engaging with the upper fixed cam ring when the door is closed; and a shock absorber that is fixedly installed inside the hinge casing at a lower portion of the upper linkage cam ring and that controls a descending motion of the upper linkage cam ring when the upper linkage cam ring descends during the process of closing the door.

[0019] It is preferable that the upper linkage cam ring is fitted inside the upper hinge casing so that the upper surface of the upper linkage cam ring does not come into contact with the lower surface of the upper fixed cam ring when the door is fully opened.

[0020] It is preferable that the length of the rod protruding from the body is maximized when the door is fully opened, the length of the rod protruding from the body gradually decreases as the door is closed, and the length of the rod protruding from the body is minimized when the door is fully closed.

[0021] The shock absorber preferably includes a control unit for controlling the lifting speed of the load, and the control unit preferably includes: a control casing fixedly installed at a lower portion of the shock absorber body; a first gear rotatably accommodated inside the control casing for controlling the lifting speed of the load; a second gear rotatably installed inside the control casing for rotating the first gear; and a rotating unit installed at one end of a gear shaft of the second gear for rotating the second gear.

[0022] It is preferable that the above-mentioned rotating part be capable of rotation through a through hole formed on one side of the upper hinge casing.

[0023] It is preferable that the above door closing restoration operation includes a pause operation in which the door closing speed is reduced during the door closing process to temporarily stop the door from closing.

[0024] It is preferable that the upper linkage cam ring is fitted inside the upper hinge casing so that the upper surface of the upper linkage cam ring contacts the lower surface of the upper fixed cam ring when the door is fully opened.

[0025] In addition, the present invention comprises: a door frame; a door leaf having a hinge casing attached thereto, which is rotatably installed on one side of the door frame to open and close an opening of the door frame, and which is formed hollow on one side and has a plurality of grooves formed longitudinally spaced apart from each other inside; an upper hinge which is installed on an upper side of the door leaf and rotatably supports an upper portion of the door leaf with respect to the door frame when the door leaf is rotated; And a lower hinge installed on the lower side of the door leaf and rotatably supporting the lower portion of the door leaf with respect to the door frame when the door leaf rotates; wherein one of the upper hinge and the lower hinge is characterized in that, when an external force for opening the door leaf is removed while opening the door leaf, a restoring force is applied in the direction in which the door leaf closes to close the door leaf, and the other of the upper hinge and the lower hinge is characterized in that, when the door leaf is closed, the door leaf closes more slowly than when it is closed by the restoring force.

[0026] It is preferable that one of the upper hinge and the lower hinge is the lower hinge, and the other of the upper hinge and the lower hinge is the upper hinge.

[0027] The upper hinge preferably includes: an upper hinge shaft member that is axially inserted and mounted inside the hinge casing and is fixed to the upper door frame of the door frame so as not to rotate relative to the upper hinge shaft member; an upper fixed cam ring that is fitted around the circumference of the upper hinge shaft member so as not to rotate relative to the upper door frame; an upper linkage cam ring that is fitted to be able to be raised and lowered and rotated at a lower portion of the upper fixed cam ring and that descends in the longitudinal direction of the upper hinge shaft member while engaging with the upper fixed cam ring when the door is closed; and a shock absorber that is fixedly installed inside the hinge casing at a lower portion of the upper linkage cam ring and that allows the upper linkage cam ring to slowly descend when the upper linkage cam ring descends during the process of closing the door.

[0028] It is preferable that the length of the rod protruding from the body is maximized when the door is fully opened, and that the length of the rod protruding from the body gradually decreases as the door is closed, so that the length of the rod protruding from the body is minimized when the door is fully closed.

[0029] The lower hinge comprises: a lower hinge shaft member that is inserted and installed in the axial direction into the interior of the hinge casing and is fixed so as not to rotate relative to the right door frame; a lower fixed cam ring that is fitted so as not to rotate relative to the circumference of the lower hinge shaft member; a lower interlocking cam ring that is fitted so as to be able to rise and fall and rotate around the circumference of the lower hinge shaft member from the upper portion of the lower fixed cam ring, and that rotates together with the door when the door is opened by engaging the lower fixed cam ring, and descends in the longitudinal direction of the lower hinge shaft member when an external force for opening the door is removed; And it is preferable to include a lower spring that is flexibly fitted around the circumference of the lower hinge shaft member at the upper portion of the lower linkage cam ring, is compressed when the lower linkage cam ring rises in the longitudinal direction of the lower hinge shaft member, and is tensioned in the longitudinal direction of the lower hinge shaft member when an external force for opening the door is removed during opening the door, thereby closing the door.

[0030] The upper hinge comprises: an upper hinge shaft member that is axially inserted and mounted inside the hinge casing and is fixed to the upper door frame of the door frame so as not to rotate relative to the upper hinge shaft member; an upper fixed cam ring that is fitted around the circumference of the upper hinge shaft member so as not to rotate relative to the upper hinge shaft member; an upper linkage cam ring that is fitted around the circumference of the upper hinge shaft member at the lower portion of the upper fixed cam ring so as to be able to rise and fall and rotate, and when the door leaf is opened by engaging the upper fixed cam ring, rotates together with the door leaf and rises in the longitudinal direction of the upper hinge shaft member, and when an external force for opening the door leaf is removed, descends in the longitudinal direction of the upper hinge shaft member; an upper spring that is fitted around the circumference of the upper hinge shaft member at the lower portion of the upper linkage cam ring and is compressed when the upper linkage cam ring descends in the longitudinal direction of the upper hinge shaft member; It is preferable to include a pressure member that is movably fitted around the circumference of the upper hinge shaft member at the lower end of the upper linkage cam ring, and when the upper linkage cam ring is lowered, the pressure member is lowered downward by the force of the upper linkage cam ring being lowered; and a shock absorber that is fixedly installed inside the hinge casing at the lower end of the pressure member, and when the pressure member is lowered by the upper linkage cam ring during the process of closing the door, the upper linkage cam ring and the pressure member are allowed to slowly lower.

[0031] It is preferable that one of the upper hinge and the lower hinge is the upper hinge, and the other of the upper hinge and the lower hinge is the lower hinge.

[0032] The lower hinge preferably includes: a lower hinge shaft member that is axially inserted and installed inside the hinge casing and is fixed so as not to rotate relative to the right door frame; a lower fixed cam ring that is fitted around the circumference of the lower hinge shaft member so as not to rotate relative to the circumference; an upper linkage cam ring that is fitted inside the hinge casing so as to be able to be raised and lowered and rotated at a singe portion of the lower fixed cam ring, and that rises in the longitudinal direction of the lower hinge shaft member while engaging with the lower fixed cam ring when the door is closed; and a shock absorber that is fixedly installed inside the hinge casing above the upper linkage cam ring and allows the upper linkage cam ring to slowly rise when the lower linkage cam ring rises during the process of closing the door.

[0033] According to the hinge structure of the swing door of the present invention, when an external force for opening the door leaf is removed while the swing door leaf is being opened, a hinge structure of the swing door can be provided that allows the door leaf to close more slowly than when closed by the restoring force when a restoring force is applied in the direction in which the door leaf is closed.

[0034] Even if the size of the door leaf is not predetermined or is requested by the user, when the external force that causes the door leaf to open is removed while the door leaf is being opened, a hinge structure of a swing door can be provided that allows the door leaf to be closed and installed immediately by adjusting the restoring action on site when a restoring force is applied in the direction of closing the door leaf.

[0035] In addition, the present invention can provide a hinge structure for a swing door that can be installed by simply adjusting the installation positions of the upper fixed cam ring and the upper linkage cam ring at the installation site of the swing door, thereby adjusting the point in time at which the restoring force begins to decrease when the door leaf is closed by the restoring force.

[0036] In addition, the present invention can provide a hinge structure for a swing door that allows the user to reduce the size of the door closing restoring force as desired, depending on the installation site of the swing door, that is, when the door size is not predetermined or depending on the user's request.

[0037] In addition, the present invention provides a hinge structure for a swing door that allows a user to easily adjust the degree to which the restoring force applied in the closing direction of the door is reduced as needed, thereby controlling the closing speed of the door, even after the door leaf of the swing door is installed on the door frame, when the door leaf is closed by applying a restoring force in the closing direction.

[0038] In addition, the present invention can provide a hinge structure of a swing door that temporarily stops the closing motion of the door leaf when a restoring force is applied in the closing direction of the swing door leaf to close the door leaf, thereby temporarily stopping the closing motion of the door leaf.

[0039] In addition, another object of the present invention is to provide a hinge structure for a swing door that prevents the door from closing at an abrupt rate when the door approaches the door frame when closing the swing door, thereby allowing the door to close without shaking as it slowly approaches the door frame.

[0040] FIG. 1 is a perspective view of a door frame of a hinge structure of a swing door according to one embodiment of the present invention.

[0041] Figure 2 is a perspective view of a door leaf having a hinge structure according to one embodiment of the present invention.

[0042] FIG. 3 is a cross-sectional view showing a swing door with a hinge structure applied according to one embodiment of the present invention in a fully open position.

[0043] Figure 4 is a cross-sectional view showing the door in Figure 3 in a state of being moved to a closed position.

[0044] FIG. 5 is a cross-sectional view showing a swing door with a hinge structure applied according to one embodiment of the present invention in a fully closed position.

[0045] FIG. 6 is a perspective view showing the door leaf, lower hinge, and lower hinge casing separated from the hinge structure of a swing door according to one embodiment of the present invention.

[0046] Figure 7 is an exploded perspective view of Figure 6.

[0047] FIG. 8 is a perspective view showing the door leaf, upper hinge, and upper hinge casing separated from the hinge structure of a swing door according to one embodiment of the present invention.

[0048] Figure 9 is an exploded perspective view of Figure 8.

[0049] Fig. 10 is an exploded perspective view of Fig. 8 from another angle.

[0050] Fig. 11 is a swing door to which a hinge structure of a swing door according to another embodiment of the present invention is applied.

[0051] Fig. 12 is a cross-sectional view showing a swing door with a hinge structure applied according to another embodiment of the present invention in a fully open position.

[0052] Fig. 13 is a cross-sectional view showing the door in Fig. 12 in a state of being moved to a closed position.

[0053] Fig. 14 is a cross-sectional view showing a swing door with a hinge structure applied according to another embodiment of the present invention in a fully closed position.

[0054] Fig. 15 is a perspective view showing the lower hinge and casing in the hinge structure of the swing door illustrated in Fig. 12.

[0055] Figure 16 is an exploded perspective view of Figure 15.

[0056] FIG. 17 is a perspective view showing an upper hinge, an upper door frame, and a casing in a hinge structure of a swing door according to another embodiment of the present invention illustrated in FIG. 12.

[0057] Figure 18 is an exploded perspective view of Figure 17.

[0058] Fig. 19 is a cross-sectional view of a swing door to which another embodiment of a shock absorber is applied in a hinge structure of a swing door according to another embodiment of the present invention.

[0059] Fig. 20 is a cross-sectional view showing another embodiment of an upper hinge in a swing door to which a hinge structure of a swing door is applied according to another embodiment of the present invention.

[0060] Fig. 21 is a perspective view showing the upper hinge, door frame, and casing in Fig. 20.

[0061] Figure 22 is an exploded perspective view of Figure 21.

[0062] Figure 23 is a cross-sectional view showing a swing door with a hinge structure applied according to another embodiment of the present invention in a fully open position.

[0063] Fig. 24 is a perspective view of the upper hinge and casing in Fig. 23.

[0064] Figure 25 is an exploded perspective view of the upper door frame, upper hinge, and casing in Figure 23.

[0065] Figure 26 is a perspective view showing the main components of the lower hinge, casing, and right door frame in Figure 23 separated.

[0066] Figure 27 is an exploded perspective view of Figure 26.

[0067] A hinge structure of a swing door according to one embodiment of the present invention is described in detail with reference to the attached drawings.

[0068] The hinge structure of a swing door according to the present invention is such that, even if the size of the door leaf is not predetermined or there is a user's request, when an external force that opens the door leaf is removed while the swing door leaf is being opened, a restoring force is applied in the direction in which the door leaf closes, and the restoring action of the door leaf closing can be immediately adjusted and installed on site. As shown in FIGS. 1 and 2, the swing door includes a door frame (1), a door leaf (10), an upper hinge casing (11), a lower hinge casing (15), a lower hinge (20), and an upper hinge (30).

[0069] As illustrated in Fig. 1, the door frame (1) comprises a left door frame (2), a right door frame (3), and an upper door frame (4), and an opening (6) is formed inside to insert a door leaf (10). A step (5) is formed in the left door frame (2), the right door frame (3), and the upper door frame (4) to prevent the door leaf (10) from closing further when it is completely closed. As illustrated by reference numeral A in Fig. 1, an upper door frame member (35) is fixedly connected to the upper side of the right door frame (3), and as illustrated by reference numeral B in Fig. 1, a lower door frame member (50) is fixedly connected to the lower side of the right door frame (3). Here, terms including directions such as left door frame (2), right door frame (3), and upper door frame (4) are based on the directions illustrated in Figs. 1 and 2.

[0070] The door (10) is rotatably installed on one side of the door frame (1) to open and close the opening of the door frame (1), and a groove (10a) is formed on one side of the upper corner for fixing and connecting the upper door leaf connecting member (39) of the upper hinge (30) described later, as shown in FIG. 2 and FIG. 8, and a groove (10b) is formed on one side of the lower corner for fixing and connecting the lower door leaf connecting member (70) of the lower hinge (20) described later, as shown in FIG. 6. The door (10) may be of various shapes, including an ABS door, a wooden door, etc. Unexplained reference numeral 19 is a protective cover installed on one side of the door (10).

[0071] The upper hinge casing (11) is a hollow body (341) fixedly attached to the upper side of the door leaf (10) as shown in FIGS. 2 and 8, and inside, a plurality of grooves (11a) for connecting the upper door leaf connecting member (39) and a plurality of grooves (11b) for fitting the spline projections (33a) of the upper linkage cam ring (33) are formed longitudinally and spaced apart from each other.

[0072] The lower hinge casing (15) is a hollow body (341) fixedly attached to the lower side of the door leaf (10) as shown in FIGS. 2 and 6, and has a plurality of grooves (15a) for connecting the lower door leaf connecting member (70) and grooves (15b) for fitting the spline projections (23a) of the lower linkage cam ring (23) formed longitudinally and spaced apart from each other inside.

[0073] The lower hinge (20) is installed so that at least a portion of it is fitted into the interior of the lower hinge casing (15), as illustrated by reference numeral C in FIG. 2, and when the door (10) rotates, it rotatably supports the lower portion of the door (10) with respect to the door frame (1), preferably the right door frame (3), and when the external force that opens the door (10) is removed while the door (10) is being opened, it generates a restoring force that closes the door (10), thereby closing the door (10). Various structures can be used, and an example thereof includes a lower hinge shaft member (21), a lower fixed cam ring (22), a lower linked cam ring (23), and a lower spring (24), as illustrated in FIGS. 2 to 7.

[0074] The lower hinge shaft member (21) is a shaft member that serves as the center of the lower hinge (20), and as shown in FIG. 7, is composed of a square portion (21a) formed at the bottom, a cylindrical body (21b) formed at the top of the square portion (21a), and a screw portion (21c) formed at the top of the cylindrical body (21b), and is inserted and mounted in the axial direction into the interior of the lower hinge casing (15) and fixed so as not to rotate relative to the right door frame (3).

[0075] The lower fixed cam ring (22) is a ring-shaped cam that is fitted around the square portion (21a) of the lower hinge shaft member (21) so as to be relatively non-rotatable, as illustrated in FIGS. 3 to 7. As illustrated in FIG. 7, a hinge hole (22a) opened in the center is aligned with the square portion (21a), thereby axially connecting with the lower hinge shaft member (21), and hills and valleys are alternately formed at 90-degree intervals on the upper surface. Therefore, the lower fixed cam ring (22) cannot rotate relative to the lower hinge shaft member (21), so that when the lower linkage cam ring (23), which will be described later, rotates together with the door leaf (10), the lower fixed cam ring (22) maintains its current fixed position, thereby causing the lower linkage cam ring (23) to move up and down while rotating relative to compress or release the lower spring (24).

[0076] The lower linkage cam ring (23) is a ring-shaped cam that is fitted around the lower hinge shaft member (21) so as to be able to rise and fall and rotate from the upper portion of the lower fixed cam ring (22), as shown in FIGS. 3 to 7. When the door (10) is opened by engaging with the lower fixed cam ring (22), it rotates together with the door (10) and rises in the longitudinal direction of the lower hinge shaft member (21), and when the external force for opening the door (10) is removed, it descends in the longitudinal direction of the lower hinge shaft member (21).

[0077] In addition, the lower linkage cam ring (23) is inserted into the lower hinge casing (15) attached to the lower side of the door (10) so as to be pivotally connected to the pivot rotation center of the door (10) as shown in FIGS. 2, 6, and 7 so as to be linked to the rotation of the door (10), and the spline projection (23a) formed to extend axially on the outer circumference is fitted into the groove portion (15b) formed on the inner circumference of the lower hinge casing (15). Therefore, the lower linkage cam ring (23) rotates in conjunction with the rotation of the door (10), i.e., the lower hinge casing (15), and moves up and down by the meshing contact with the lower fixed cam ring (22) during the rotation.

[0078] The lower linkage cam ring (23) and the lower fixed cam ring (22) that are interlocked in this way have mountains and valleys formed on their contact surfaces, as shown in FIGS. 6 and 7. The lower linkage cam ring (23) located above has mountains and valleys formed on its lower surface, as shown in FIG. 7, and conversely, the lower fixed cam ring (22) located below has valleys and mountains formed on its upper surface. At this time, the lower surface of the lower linkage cam ring (23) has mountains and valleys formed alternately at 90-degree intervals, and the upper surface of the lower fixed cam ring (22) has valleys and mountains formed alternately at 90-degree intervals. In addition, the mountains of the lower linkage cam ring (23) have mountain ridges (231) formed on their mountains, and the valley bottoms (232) formed on their valleys, and the lower fixed cam ring (22) also has valley bottoms (222) formed on its valleys, and mountain ridges (221) formed on its mountains. Here, when the door (10) is in the fully open position as shown in FIG. 3, the ridge (231) of the lower linkage cam ring (23) shown in FIG. 3 contacts the ridge (221) of the lower fixed cam ring (22), and when the door (10) is in the fully closed position as shown in FIG. 5, the ridge (231) of the lower linkage cam ring (23) contacts the groove (222) of the lower fixed cam ring (22) shown in FIG. 6.

[0079] Fig. 4 is a drawing explaining the operation when the door (10) is switched from the open position to the closed position. In Fig. 4, the lower fixed cam ring (22) and the lower linkage cam ring (23) are in contact at their respective inclined portions (223, 232). When the door (10) continues to close in the state of Fig. 3 in which they are in contact at their respective inclined portions (223, 233), the lower linkage cam ring (23) descends along with the rotation of the door (10), and at this time, the inclined portion (233) of the lower linkage cam ring (23) continues to engage with the inclined portion (223) of the lower fixed cam ring (22), and when the ridge (231) of the lower linkage cam ring (23) comes into contact with the groove (222) of the lower fixed cam ring (22), as shown in Fig. 5, the door (10) is completely closed.

[0080] The lower spring (24) is flexibly fitted around the lower hinge shaft member (21) at the upper portion of the lower linkage cam ring (23), and is compressed when the lower linkage cam ring (23) rises in the longitudinal direction of the lower hinge shaft member (21), and when the external force that causes the door (10) to open is removed during the opening of the door (10), the lower spring (24) is tensioned in the longitudinal direction of the lower hinge shaft member (21), thereby allowing the door (10) to close.

[0081] Here, the lower hinge shaft member (21) is fixedly connected to the door frame (1), preferably the right door frame (3), so as not to rotate relative to the door frame. Various examples can be used for the structure in which the lower hinge shaft member (21) is fixedly connected to the right door frame (3) so as not to rotate relative to the door frame. As an example, a lower fitting plate (40) and a lower door frame connecting member (50) can be used as shown in FIGS. 6 and 7.

[0082] The lower fitting plate (40) has a circular hole (41) formed in the center, and a cylindrical portion (21d) formed at the lower portion of the square portion (21a) of the lower hinge shaft member (21) is fixed to the circular hole (41) so as not to rotate relative to it by a method such as welding. Here, if the circular hole (41) at the center of the lower fitting plate (40) is formed in a polygonal shape, the lower fitting plate (40) can be directly fitted to the square portion (21a) of the lower hinge shaft member (21) so as to be aligned, thereby being fixed to the lower hinge shaft member (21) so as not to rotate relative to it.

[0083] The lower door frame connecting member (50) is a supporting member that connects the lower fitting plate (40) fixedly mounted on the outer periphery of the cylindrical portion (21d) formed at the lower portion of the lower hinge shaft member (21) to the right door frame (3) without relative rotation, and is composed of a connecting plate (55) and a fixed plate (51) as shown in FIGS. 6 and 7.

[0084] The lower fitting plate (40) is fitted into a hole (52) formed in the center of the connecting plate (55), for example, a hole (52) having a square shape, so as not to rotate relative to the connecting plate, and the fixed plate (51) is formed by being bent upward from one side of the connecting plate (55) and extended, and a plurality of screw holes are formed so that it can be fixedly connected to the right door frame (3).

[0085] In addition, a mediating ring (60) and a lower door connecting member (70) can be fitted to the outer periphery of the lower hinge shaft member (21) to connect the door (10) so that it can rotate with respect to the lower hinge shaft member (21).

[0086] The intermediate ring (60) is a ring that is fitted around the periphery of the square portion of the lower hinge shaft member (21) so that the lower door connecting member (70) fitted around the outer periphery of the lower hinge shaft member (21) can rotate smoothly on the outer periphery of the lower hinge shaft member (21). A polygonal hinge hole (62) that is aligned with the square portion (21a) is formed in the center, and the outer periphery (61) is formed in the shape of a cylinder.

[0087] The lower door leaf connecting member (70) is a member that is fitted around the circumference of the intermediate ring (60) having a cylindrical shape so that the door leaf (10) can rotate around the lower hinge axis member (21). As illustrated in FIG. 7, it has a form in which a ring portion (71) and a plate body (72) are combined, wherein the plate body (72) is fixedly fitted to a groove portion (10b) formed at the lower edge of the door leaf (10), and the ring portion (71) is rotatably fitted to the outer circumference of the lower hinge axis member (21). Unexplained reference numeral 25 denotes a nut, 26 denotes a bearing, 57 denotes a height adjustment plate for adjusting the installation height of the lower hinge (20), 73 denotes a ring fitted around the circumference of the intermediate ring (60), and 74 denotes a ring fitted between the lower door leaf connecting member (71) and the lower fitting plate (40).

[0088] The upper hinge (30) is installed by fitting at least a portion of the interior of the upper hinge casing (11) installed on the upper side of the door leaf (10) as illustrated by the drawing symbol D in FIG. 2, and when the door leaf (10) rotates, it rotatably supports the upper part of the door leaf (10) with respect to the door frame (1), preferably the upper door frame (4), and when the door leaf (10) is closed, it controls the restoring motion of the door leaf (10) closing by the restoring force generated by the lower hinge (20). Various structures can be used, and an example thereof includes an upper hinge shaft member (31), an upper fixed cam ring (32), an upper linked cam ring (33), and a shock absorber (34) as illustrated in FIGS. 2 to 5 and FIGS. 8 to 10.

[0089] The upper hinge shaft member (31) is a shaft member that serves as the center of the upper hinge (30), and as shown in FIGS. 8 to 10, the outer periphery is formed as a square portion, and is fixedly installed by being inserted in the axial direction into the interior of the upper hinge casing (11), and is fixedly connected so as not to rotate relative to the upper door frame (4). Various examples can be used for the structure in which the upper hinge shaft member (31) is fixedly connected to the upper door frame (4) so ​​as not to rotate relative to the upper door frame, and as an example, an intermediate block (36) and an upper door frame connecting member (35) as shown in FIGS. 8 to 10 can be used.

[0090] As shown in FIGS. 9 and 10, the intermediate block (36) has a polygonal hole (36a) formed in the center, and a square portion of the upper hinge shaft member (31) is fitted into the polygonal hole (36a) so as not to rotate relative to the center. In addition, the outer periphery of the intermediate block (36) is formed with a square portion (36b) that can be fitted into a hole (35c) of the upper door frame connecting member (35) described later, and a cylindrical portion (36c) for fitting the ring portion (39a) of the upper door leaf connecting member (39). Here, the square portion (36b) is formed in a polygonal shape, preferably a rectangular shape.

[0091] The upper door frame connecting member (35) is a supporting member that connects the intermediate block (36) fitted to the outer periphery of the upper hinge shaft member (31) to the right door frame (3) so that it cannot rotate relative to the other side, and is composed of a connecting plate (35a) and a fixed plate (35b) as shown in FIGS. 8 to 10.

[0092] The connecting plate (35a) has a hole (35c) formed in the center, for example, a square hole (35c), into which the square portion (36b) of the intermediate block (36) is fitted so as not to rotate relative to the hole, and the fixed plate (35b) is formed by being extended by being bent downward from one side of the connecting plate (35a), and a plurality of screw holes are formed so that it can be fixedly connected to the right door frame (3).

[0093] In addition, an upper door connection member (39) can be fitted to the outer periphery of the upper hinge shaft member (31) to connect the door (10) so that it can rotate with respect to the upper hinge shaft member (31).

[0094] The upper door leaf connecting member (39) is a member that is fitted around the cylindrical portion (36c) of the intermediate block (36) as shown in FIGS. 8 and 9 so that the door leaf (10) can rotate around the upper hinge axis member (31), and is formed by combining a ring portion (39a) and a plate body (39b) as shown in FIG. 9, wherein the ring portion (39a) is rotatably fitted around the outer periphery of the upper hinge axis member (31), and the plate body (39b) is fixedly connected to a groove portion (10a) formed on the upper side edge of the door leaf (10) and a groove portion (11a) formed on the upper hinge casing (11). The unexplained symbol 37 is a fixing screw that securely connects the intermediate block (36) to the upper hinge shaft member (31), 37a is a washer, 45 is a ring that fits around the cylindrical portion (36c) of the intermediate block (36) on top of the upper door leaf connecting member (39), 47 is a ring that fits around the cylindrical portion (36c) of the intermediate block (36), 38 is a ring that fits around the ring (47) on top of the upper door leaf connecting member (39), and 39c, 39d, and 39e are fixing screws.

[0095] The upper fixed cam ring (32) is a ring-shaped cam that is fixedly mounted around the upper hinge shaft member (31) so as to be unable to rotate relative to the upper door frame (4) of the door frame (1) as illustrated in FIGS. 3 to 5 and FIGS. 8 to 10, and is inserted into the interior of the upper hinge casing (11). The lower surface has mountains and valleys alternately formed at 90-degree intervals. Therefore, the upper fixed cam ring (32) cannot rotate relative to the upper hinge shaft member (31), and when the upper linkage cam ring (33), which will be described later, rotates together with the door leaf (10), it maintains the current fixed position, thereby causing the upper linkage cam ring (33) to move up and down while rotating relative to compress or release the rod (342) of the shock absorber (34), which will be described later. Unexplained reference numeral 323 is an inclined portion that connects the ridge (322) and the valley bottom (321).

[0096] The upper fixed cam ring (32) may be formed integrally with the upper hinge shaft member (31) so as not to be separated from each other as shown in FIG. 9, or alternatively, the upper fixed cam ring (32) and the upper hinge shaft member (31) may be formed as separate bodies, and then the upper fixed cam ring (32) may be fixedly coupled around the upper hinge shaft member (31) so as not to rotate relative to each other.

[0097] The upper linkage cam ring (33) is a ring-shaped cam inserted into the interior of the upper hinge casing (11) to enable lifting and rotation from the lower portion of the upper fixed cam ring (32). As shown in FIGS. 3 to 5 and FIGS. 8 to 10, it is inserted into the interior of the upper hinge casing (11) to enable lifting and rotation between the upper fixed cam ring (32) and the shock absorber (34), thereby allowing for up-and-down movement, i.e., lifting and lowering, thereby applying or releasing pressure to the load (342) of the shock absorber (34) described later.

[0098] The upper linkage cam ring (33) is inserted into the upper hinge casing (11) so as to be axially connected to the pivot rotation center of the door (10), as shown in FIGS. 9 and 10, in order to be linked to the rotation of the door (10). A spline projection (33a) is formed on the outer surface thereof and extends axially to be fitted into a groove (11b) on the inner surface of the upper hinge casing (11). Therefore, the upper linkage cam ring (33) rotates in conjunction with the rotation of the door (10), i.e., the upper hinge casing (11), and moves up and down by engaging contact with the upper fixed cam ring (32) during the rotation.

[0099] The upper linkage cam ring (33) has a mountain and a valley formed on the upper surface that mesh with the mountain and valley formed on the lower surface of the upper fixed cam ring (32), and when the door (10) is in a fully open position, it rotates together with the door (10) and rises in the longitudinal direction of the upper hinge shaft member (31) as shown in FIG. 3, and when the door (10) is in a fully closed position, it descends in the longitudinal direction of the upper hinge shaft member (31) as shown in FIG. 5.

[0100] In this way, the upper interlocking cam ring (33) and the upper fixed cam ring (32) that are interlocked with each other have mountains and valleys formed on their contact surfaces, as shown in FIGS. 9 and 10. The upper interlocking cam ring (33) located below has mountains and valleys formed on its upper surface as shown in FIG. 9, and conversely, the upper fixed cam ring (32) located above has valleys and mountains formed on its lower surface. At this time, the upper surface of the upper interlocking cam ring (33) has mountains and valleys formed alternately at 90-degree intervals, and the lower surface of the upper fixed cam ring (32) has valleys and mountains formed alternately at 90-degree intervals. In addition, the mountains of the upper interlocking cam ring (33) have mountain peaks (331) and the valley bottoms (332) are formed respectively, and the upper fixed cam ring (32) also has valley bottoms (321) formed on its valleys and mountain tops (322) formed respectively. Here, as illustrated in FIG. 3, when the door (10) is in the fully open position, the ridge (331) of the upper linkage cam ring (33) illustrated in FIG. 9 is positioned toward the bottom (321) of the upper fixed cam ring (32), and the bottom (332) of the upper linkage cam ring (33) is positioned toward the top (322) of the upper fixed cam ring (32). Conversely, as illustrated in FIG. 5, when the door (10) is in the fully closed position, the ridge (331) of the upper linkage cam ring (33) illustrated in FIG. 9 is in contact with the top (322) of the upper fixed cam ring (32). Accordingly, in the section where the ridge (322) and the ridge (331) are in contact and maintain their positions in the fully closed position of the door (10), the rod (342) of the shock absorber (34) described later is pressurized to the maximum extent so that the length of the rod (342) protruding from the body (341) is minimized.

[0101] As shown in FIG. 4, the shock absorber (34) is fixedly installed inside the upper hinge casing (11) at the bottom of the upper linkage cam ring (33), so that when the upper linkage cam ring (33) is lowered during the closing process of the door (10), the movement of the upper linkage cam ring (33) is controlled. Various types of shock absorbers (34) can be used, and as an example, a structure including a body (341) and a rod (342) can be used, as shown in FIGS. 3 and 8. Here, the detailed structure inside the body (341) is not the gist of the present invention, so a description thereof is omitted.

[0102] The rod (342) is installed so that a portion thereof protrudes from the body (341), and when no external force is applied to the rod (342), it protrudes as much as possible from the body (341), and when an external force is applied to the rod (342) in the longitudinal direction of the rod (342), that is, downward in FIGS. 3 to 5, a portion thereof is accommodated inside the body (341), and the length of the rod (342) protruding from the body (341) due to the external force becomes smaller.

[0103] It is preferable that the tip (343) of the rod (342) be formed larger than the outer diameter of the rod (342) so that the descending force of the upper linkage cam ring (33) can be more effectively transmitted to the rod (342) when the upper linkage cam ring (33) is lowered.

[0104] FIG. 3 shows the state of the upper linkage cam ring (33) and the shock absorber (34) when the door (10) is fully opened. The upper surface of the upper linkage cam ring (33) shown in FIG. 3 is slightly apart from the lower surface of the upper fixed cam ring (32), and the lower surface of the upper linkage cam ring (33) is in contact with the tip (343) of the shock absorber (34). In this state, when the door (10) is closed, the upper linkage cam ring (33) rotates along with the rotation of the door (10), and when the upper linkage cam ring (33) rotates, the upper linkage cam ring (33) continues to rotate in place until the inclined surface (333) of the upper linkage cam ring (33) comes into contact with the inclined surface (323) of the upper fixed cam ring (32). (Until the rotation in place is performed in this way, the load of the shock absorber (34) described later is not contracted, so the restoring force for closing the door (10) generated by the lower hinge (20) is not hindered, that is, the closing speed of the door (10) is not reduced at all.)

[0105] Afterwards, when the upper linkage cam ring (33) rotates further, as shown in FIG. 4, the inclined surface (333) of the upper linkage cam ring (33) engages with the inclined surface (323) of the upper fixed cam ring (32), causing the upper linkage cam ring (33) to descend downwards (in order for the upper linkage cam ring (33) to descend downwards, the rod (342) of the shock absorber (34) must contract downwards, but in order to contract the rod (342) downwards, a large force is required to press the rod (342) downwards, and this large force greatly reduces the closing speed of the door (10) due to the restoring force of the door (10) closing, and depending on the degree of adjustment of the adjustment unit (80) described later, the door (10) may temporarily stop closing).

[0106] Afterwards, when the upper linkage cam ring (33) is lowered, the upper linkage cam ring (33) applies pressure to the tip (343) of the rod (342) protruding from the body (341) and applies downward pressure to the rod (342) protruding from the body (341) to the maximum as shown in FIG. 4, so that the length of the rod (342) protruding from the body (341) gradually decreases, and when the door (10) is closed further, the upper linkage cam ring (33) is lowered further as shown in FIG. 5, so that the ridge (322) of the upper fixed cam ring (32) and the ridge (331) of the upper linkage cam ring (33) come into contact, and at the same time, the rod (342) protruding from the body (341) is lowered to the maximum as shown in FIG. 5, so that an external force is applied downward to the rod (342) protruding from the body (341). The length of the rod (342) is minimized, and in this process, the restoring force acting in the direction of closing the door (10) by the lower hinge (20) gradually decreases, thereby reducing the closing speed of the door (10), so that the door (10) closes slowly and smoothly until it touches the step (5) of the door frame (1).

[0107] Accordingly, when the door (10) is completely opened, the length of the rod (342) protruding from the body (341) is maximum, and when the door (10) is closed, the length of the rod (342) protruding from the body (341) gradually decreases, and when the door (10) is completely closed, the length of the rod (342) protruding from the body (341) is minimum.

[0108] Meanwhile, the shock absorber (34) may further include a control unit (80) for controlling the pressure inside the body (341) to control the lifting speed of the load (342) according to the user's needs. Various examples may be used for the structure of the control unit (80), and as an example, it may be composed of a control casing (81), a first gear (82), a second gear (83), and a rotating unit (84), as shown in FIGS. 9 and 10.

[0109] The adjusting casing (81) is preferably a cylindrical casing fixedly installed at the bottom of the body (341) of the shock absorber (34), and the inner circumference of the adjusting casing (81) is screw-connected to the outer circumference of the body (341). A second gear (83) is rotatably installed inside, and a spline projection (81a) is formed to extend axially on the outer circumference and is fitted into a groove (11b) on the inner circumference of the upper hinge casing (11).

[0110] The first gear (82) is installed at the bottom of the body (341) so as to control the pressure inside the body (341) and controls the lifting and lowering speed of the rod (342) according to the opening and closing of the door (10) when the door (10) is opened and closed. The outer diameter of the first gear (82) is formed smaller than the inner diameter of the body (341) so that it can rotate inside the body (341).

[0111] The second gear (83) is rotatably installed inside the adjusting casing (81) to rotate the first gear (82), and the gear shaft (83a) of the second gear (83) is installed by being fitted into a pair of through holes (85) formed in the adjusting casing (81), and a rotating part (84), such as a screw groove or wrench part that can rotate the gear shaft (83a), is installed at one end of the gear shaft (83a) so as to be exposed to the outside of the adjusting casing (81). The rotating part (84) installed to be exposed to the outside of the adjustment casing (81) is installed so as to be in a straight line with the through hole (11c) formed on one side of the upper hinge casing (11), so that when the door (10) is installed at the site or even after the door (10) is completely installed, a tool such as a hexagonal wrench or a driver is passed through the through hole (11c) formed on one side of the upper hinge casing (11) to rotate the rotating part (84), the second gear (83) is rotated, and the second gear (83) rotates the first gear (82) while controlling the pressure inside the body (341), thereby controlling the speed at which the load of the shock absorber (34) is raised and lowered.

[0112] The shock absorber (34) is fixedly connected to the lower adjustment casing (81) as shown in Fig. 8, and the shock absorber (34) fixedly connected to the adjustment casing (81) is fitted into the interior of the upper hinge casing (11) and then prevented from descending downwards. A support member (90) is fitted into the lower side of the upper hinge casing (11), and the support member (90) can be fixedly connected to the upper hinge casing (11) and the door leaf (10) using fixing screws (91, 92).

[0113] The fixing screw (91) is for fixing the support member (90) to the door leaf (10), and passes through a hole (90a) formed in the support member (90) to fix the support member (90) and the upper hinge casing (11) to the side of the door leaf (10), and the fixing screw (92) passes through a through hole (90b) of the support member (90) and is fixedly connected to the groove (11a) of the upper hinge casing (11) to fix the support member (90) and the upper hinge casing (11).

[0114] Meanwhile, the shock absorber (34) may further have a spring (not shown) installed on the outer periphery of the rod (342) protrudingly installed on one side of the body (341). By installing the spring (not shown) on the outer periphery of the rod (342) in this way, when the door (10) is opened from a closed state, the rod (342) can be reliably protruded upward from the body (341) of the shock absorber (34).

[0115] According to a preferred embodiment of the present invention, the hinge structure of a swing door having the structure as described above is such that an upper hinge (30) is installed on the upper side of the swing door, and a lower hinge (20) is installed on the lower side of the swing door, as shown in FIGS. 2 to 5.

[0116] Referring to FIG. 3, FIG. 3 is a drawing showing the lower hinge (20) and the upper hinge (30) when the door leaf (10) of the door is in the fully open position. In the lower hinge (20), the lower spring (24) is compressed while the ridge (231) of the lower linkage cam ring (23) engages with the ridge (221) of the lower fixed cam ring (22), and in the upper hinge (30), the rod (342) of the shock absorber (34) protrudes upward to the maximum, and the length of the protruding rod (342) reaches the maximum, and the upper linkage cam ring (33) rises upward so that the groove (332) of the upper linkage cam ring (33) remains close to the ridge (322) of the upper fixed cam ring (32).

[0117] When the user closes the door (10) in the state of FIG. 3 above, as shown in FIG. 3, the contact area between the ridge (231) of the lower linkage cam ring (23) and the ridge (221) of the lower fixed cam ring (22) is narrow, so that the lower linkage cam ring (23) is immediately changed from an open state to a closed state by the engagement contact of the inclined portions (223, 233) as shown in FIG. 4 and FIG. 7, even with a slight rotation by an external force, due to the restoring force of the lower spring (24), and then returns to the fully closed position of the door (10) in which the ridge (231) of the lower linkage cam ring (23) and the groove (232) of the lower fixed cam ring (22) are engaged as shown in FIG. 5. At this time, in order to control the restoration operation of closing the door (10) by the restoring force of the lower spring (24) (i.e., the door (10) is closed) In order to reduce the speed), if the upper linkage cam ring (23) and shock absorber (34) are installed separately from the lower hinge (20) on the upper hinge (30), the closing speed of the door (10) is reduced by the action of the upper linkage cam ring (23) and shock absorber (34), so that the door (10) closes slowly and smoothly until it touches the step (5) of the door frame (1). Here, when the door (10) is closed by the restoring force, the point in time at which the restoring force begins to decrease is when the inclined surface (333) of the upper linkage cam ring (33) comes into contact with the inclined surface (323) of the upper fixed cam ring (32), so that the restoring force decreases and the door (10) closes slowly. Accordingly, by adjusting the degree of gap between the upper surface of the upper linkage cam ring (33) and the lower surface of the upper fixed cam ring (32), the point in time at which the door (10) slowly closes can be adjusted while the door (10) is being closed by the restoring force, and thereafter, the door (10) slowly and smoothly closes until it touches the step (5) of the door frame (1) by the action of the lower linkage cam ring (23) and the shock absorber (34).

[0118] Meanwhile, in the embodiment illustrated in FIG. 3 above, the upper linkage cam ring (33) is fitted into the interior of the upper hinge casing (11) so that the upper surface of the upper linkage cam ring (33) does not come into contact with the lower surface of the upper fixed cam ring (32) when the door (10) is fully opened, but, on the other hand, the upper linkage cam ring (33) may be fitted into the interior of the upper hinge casing (11) so that the upper surface of the upper linkage cam ring (33) comes into contact with the lower surface of the upper fixed cam ring (32) when the door (10) is fully opened, and in this example, when the door (10) is closed, the upper linkage cam ring (33) rotates along with the rotation of the door (10), and when the upper linkage cam ring (33) rotates, the inclined surface (333) of the upper linkage cam ring (33) comes into direct contact with the inclined surface (323) of the upper fixed cam ring (32). Since the load of the shock absorber (34) begins to contract immediately, the restoring force for closing the door (10) is immediately reduced, so the closing speed of the door (10) is immediately reduced and it closes slowly.

[0119] Meanwhile, FIGS. 11 to 18 illustrate a swing door to which a hinge structure of a swing door according to another embodiment of the present invention is applied.

[0120] The hinge structure of the swing door according to another embodiment illustrated in FIGS. 11 to 18 is different in the detailed configuration of the hinge structure of the swing door in that the structure of the door leaf is different compared to the hinge structure of the swing door described above. That is, the hinge structure of the swing door described above is installed on the outside of the door leaf, such as an ABS door or a wooden door leaf, whereas the hinge structure of the swing door according to another embodiment illustrated in FIGS. 11 to 18 is different in that the hinge structure is installed on the inside of the door leaf formed by four door leaf frames on the top, bottom, left, and right sides with a hollow frame made of aluminum.

[0121] The hinge structure of a swing door according to another embodiment of the present invention illustrated in FIGS. 11 to 18 is such that when an external force for opening a swing door is removed while the swing door is being opened, a restoring force is applied in the direction in which the swing door is closed, and the swing door closes more slowly than when it is closed by the restoring force. As illustrated in FIG. 11, the hinge structure of the swing door includes a door frame (1), a door leaf (10), a lower hinge (20), and an upper hinge (30).

[0122] As shown in Fig. 11, the door frame (1) has a left door frame (2), a right door frame (3), and an upper door frame (4), and an opening is formed inside.

[0123] A door leaf (10) is rotatably installed on one side of a door frame (1) to open and close the opening of the door frame (1), and a hinge casing (11) is attached to one side, which is formed hollow as shown in FIGS. 11, 15 and 16, and has a plurality of grooves (12, 13) formed longitudinally and spaced apart from each other inside.

[0124] The lower hinge (20) is installed on the lower side of the door leaf (10) as shown by the drawing symbol B in Fig. 11, and when the door leaf (10) rotates, it rotatably supports the lower part of the door leaf (10) with respect to the door frame (1), preferably the right door frame (3).

[0125] The upper hinge (30) is installed on the upper side of the door leaf (10) as shown by the drawing symbol A in Fig. 11, and when the door leaf (10) rotates, it rotatably supports the upper part of the door leaf (10) with respect to the upper door frame (4) of the door frame (1).

[0126] Here, when the external force that opens the door (10) is removed while opening the door (10), one of the lower hinge (20) and the upper hinge (30) acts to close the door (10) by applying a restoring force in the direction in which the door (10) closes, and the other of the lower hinge (20) and the upper hinge (30) acts to close the door (10) more slowly than when the door (10) is closed by the restoring force.

[0127] That is, if one of the lower hinge (20) and the upper hinge (30) is the lower hinge (20), the other becomes the upper hinge (30). In the following, the lower hinge (20) and the upper hinge (30) in the above case will be described first.

[0128] The lower hinge (20) is installed on the lower side of the door leaf (10) as shown by the drawing symbol B in FIG. 11, and when the door leaf (10) rotates, it rotatably supports the lower part of the door leaf (10) with respect to the door frame (1), preferably the right door frame (3), and when the external force that opens the door leaf (10) is removed while the door leaf (10) is being opened, a restoring force is applied in the direction in which the door leaf (10) closes, so that the door leaf (10) closes. As shown in FIGS. 12 to 16, the lower hinge shaft member (21), the lower fixed cam ring (22), the lower linked cam ring (23), and the lower spring (24) are included.

[0129] The lower hinge shaft member (21) is a shaft member that serves as the center of the lower hinge (20), and as shown in Fig. 16, is composed of a square portion (21a) formed at the bottom, a cylindrical body (21b) formed at the top of the square portion (21a), and a screw portion (21c) formed at the top of the cylindrical body (21b), and is inserted and mounted in the axial direction into the interior of the hinge casing (11) and fixed so as not to rotate relative to the right door frame (3).

[0130] The lower fixed cam ring (22) is a ring-shaped cam that is fitted around the square portion (21a) of the lower hinge shaft member (21) in a non-rotatable manner as shown in FIGS. 12, 15, and 16, and the hinge hole (22a) opened in the center is aligned with the square portion (21a), thereby being axially connected to the lower hinge shaft member (21), and on the upper surface, mountains and valleys are alternately formed at 90-degree intervals, and the ridges (221) and valley bottoms (222) are formed flat. Accordingly, the lower fixed cam ring (22) cannot rotate relative to the lower hinge shaft member (21), so that when the lower linkage cam ring (23) described later rotates together with the door leaf (10), the lower fixed cam ring (22) maintains its current fixed position, thereby causing the lower linkage cam ring (23) to move up and down while rotating relative to compress or release the lower spring (24).

[0131] The lower linkage cam ring (23) is a ring-shaped cam that is fitted around the lower hinge shaft member (21) from the upper portion of the lower fixed cam ring (22), and as shown in FIGS. 12 to 14, is fitted around the lower hinge shaft member (21) so as to be able to rise and fall and rotate, and when the door (10) is opened by engaging with the lower fixed cam ring (22), it rotates together with the door (10) and rises in the longitudinal direction of the lower hinge shaft member (21), and when the external force for opening the door (10) is removed, it descends in the longitudinal direction of the lower hinge shaft member (21).

[0132] The lower linkage cam ring (23) is inserted into the hinge casing (11) so as to be axially connected to the pivot rotation center of the door (10), as shown in FIGS. 12, 15, and 16, in order to be linked to the rotation of the door (10). A spline projection (23a) is formed on the outer surface thereof and extends axially to be fitted into the groove (13) on the inner surface of the hinge casing (11). Accordingly, the lower linkage cam ring (23) rotates in conjunction with the rotation of the door (10), i.e., the hinge casing (11), and moves up and down by engaging contact with the lower fixed cam ring (22) during the rotation.

[0133] The lower linkage cam ring (23) and the lower fixed cam ring (22) that are interlocked in this way have mountains and valleys formed on their contact surfaces, as shown in FIGS. 15 and 16. The lower linkage cam ring (23) located above has mountains and valleys formed on its lower surface, as shown in FIG. 16, and conversely, the lower fixed cam ring (22) located below has valleys and mountains formed on its upper surface. At this time, the lower surface of the lower linkage cam ring (23) has mountains and valleys formed alternately at 90-degree intervals, and the upper surface of the lower fixed cam ring (22) has valleys and mountains formed alternately at 90-degree intervals. In addition, the mountains of the lower linkage cam ring (23) have mountain ridges (231) formed on their mountains, and the valley bottoms (232) formed on their valleys, and the lower fixed cam ring (22) also has valley bottoms (222) formed on its valleys, and mountain ridges (221) formed on its mountains. Here, the ridges (231, 221) and the valleys (232, 222) are flat, so when the door (10) is in the fully open position as shown in FIG. 12, the ridge (231) of the lower linkage cam ring (23) shown in FIG. 16 contacts the ridge (221) of the lower fixed cam ring (22), and when the door (10) is in the fully closed position as shown in FIG. 14, the ridge (231) of the lower linkage cam ring (23) contacts the valley (222) of the lower fixed cam ring (22) shown in FIG. 16.

[0134] Fig. 13 is a drawing explaining the operation when the door (10) is switched from the open position to the closed position. In Fig. 13, the lower fixed cam ring (22) and the lower linkage cam ring (23) are in contact at their respective inclined portions (223, 232). When the door (10) continues to close in the state of Fig. 13 in which they are in contact at their respective inclined portions (223, 233), the lower linkage cam ring (23) descends along with the rotation of the door (10), and at this time, the inclined portion (233) of the lower linkage cam ring (23) continues to engage with the inclined portion (223) of the lower fixed cam ring (22), and when the ridge (231) of the lower linkage cam ring (23) comes into contact with the groove (222) of the lower fixed cam ring (22), as shown in Fig. 14, the door (10) is completely closed.

[0135] The lower spring (24) is flexibly fitted around the lower hinge shaft member (21) at the upper portion of the lower linkage cam ring (23), and is compressed when the lower linkage cam ring (23) rises in the longitudinal direction of the lower hinge shaft member (21), and when the external force that causes the door (10) to open is removed during the opening of the door (10), the lower spring (24) is tensioned in the longitudinal direction of the lower hinge shaft member (21), thereby allowing the door (10) to close.

[0136] Here, the lower hinge shaft member (21) is fixedly connected to the door frame (1), preferably the right door frame (3), so as not to rotate relative to the door frame. Various examples can be used for the structure in which the lower hinge shaft member (21) is fixedly connected to the right door frame (3) so as not to rotate relative to the door frame. As an example, a lower fitting plate (40) and a lower door frame member (50) can be used as shown in FIGS. 15 and 16.

[0137] As shown in FIGS. 12, 15 and 16, the lower fitting plate (40) has a polygonal hole (41) formed in the center, and the square portion (21a) of the lower hinge shaft member (21) is fitted into the polygonal hole (41) so as not to rotate relative to the center.

[0138] The lower door frame member (50) is a support member that connects the lower fitting plate (40) fitted to the outer periphery of the lower hinge shaft member (21) to the right door frame (3) so that it cannot rotate relative to the lower fitting plate (40), and is composed of a connecting plate (51) and a fixed plate (55) as shown in FIGS. 15 and 16.

[0139] The connecting plate (51) has a hole (52) formed in the center, for example, a square-shaped hole (52), into which a lower fitting plate (40) is fitted so as not to rotate relative to the hole, and a fixed plate (55) is formed to extend from one side of the connecting plate (51) toward the right door frame (3) and is fixedly connected to the lower part of the right door frame (3). The unexplained symbol 60 is a mediating ring, and a polygonal hinge hole (62) that matches the square portion (21a) in the center is formed, and the outer circumference (61) is formed in the shape of a cylinder, 70 is a lower door leaf connecting member that allows the lower hinge axis member (21) to be mounted on the door leaf (10), and is formed by combining a ring (71) and a plate body (72), 25 is a fixing screw, 26 is a bearing, 56 is a screw hole, and 3a is a groove of the right door frame (3) for fixing the fixing plate (55).

[0140] The upper hinge (30) is installed on the upper side of the door leaf (10) as shown by the drawing symbol A in FIG. 11, and when the door leaf (10) is rotated, it rotatably supports the upper part of the door leaf (10) with respect to the door frame (1), preferably the upper door frame (4), and when the door leaf (10) is closed, it closes more slowly than when the door leaf (10) is closed by the restoring force applied by the lower hinge (20) (here, the meaning of slowly closing is that when the door leaf (10) is closed in a state where the upper hinge (30) is not installed, it closes more slowly than when the door leaf (10) is closed by the restoring force applied in the closing direction of the door leaf (10). Various structures can be used, and examples thereof include the upper hinge (30) as shown in FIGS. 12 to 14, 17, and 18. It includes a hinge shaft member (31), an upper fixed cam ring (32), an upper linked cam ring (33), and a shock absorber (34).

[0141] The upper hinge shaft member (31) is a shaft member that serves as the center of the upper hinge (30), and as illustrated in FIG. 18, the outer periphery is formed by a square portion (31a), and is installed by being inserted in the axial direction inside the hinge casing (11) and is fixed so as not to rotate relative to the upper door frame (4). Here, the structure in which the upper hinge shaft member (31) is fixed so as not to rotate relative to the upper door frame (4) may use a door frame connecting member (35) and an intermediate block (36), and the detailed structures thereof may use the door frame connecting member and intermediate block known in registered patent no. 10-2211918. Unexplained reference numeral 37 denotes a fixing screw that is coupled to a hole (31b) formed in the upper portion of the upper hinge shaft member (31) so that the intermediate block (36) is not separated from the upper portion of the upper hinge shaft member (31).

[0142] The upper fixed cam ring (32) is a ring-shaped cam that is fitted so as not to rotate relative to the circumference of the square portion (31a) formed on the outer periphery of the upper hinge shaft member (31) as shown in FIGS. 12 to 14, FIG. 17, and FIG. 18, and the hinge hole (32a) opened in the center is aligned with the square portion (31a), thereby forming a fixed shaft connection with the upper hinge shaft member (31), and on the lower surface, mountains and valleys are alternately formed at 90-degree intervals, and the ridges (322) and valley bottoms (321) are formed flat. Accordingly, the upper fixed cam ring (32) cannot rotate relative to the upper hinge shaft member (31), so that when the upper linkage cam ring (33) described later rotates together with the door leaf (10), the current fixed position is maintained, thereby allowing the upper linkage cam ring (33) to move up and down while rotating relative to compress or release the load (342) of the shock absorber (34) described later. Unexplained reference numeral 323 denotes a sloped portion connecting the ridge (322) and the bottom (321), and 48 denotes a fixing screw that is coupled to a hole formed in the lower part of the lower hinge shaft member (31) so that the upper fixed cam ring (32) is not separated from the lower part of the upper hinge shaft member (31).

[0143] The upper linkage cam ring (33) is a ring-shaped cam that is fitted around the upper hinge shaft member (31) from the lower portion of the upper fixed cam ring (32), and as shown in FIGS. 12 to 14, 17 and 18, it is fitted around the upper hinge shaft member (31) between the upper fixed cam ring (32) and the shock absorber (34) so ​​as to be able to move up and down, i.e., to be able to be lifted and lowered, thereby applying or releasing pressure to the load (342) of the shock absorber (34) described later.

[0144] The upper linkage cam ring (33) is inserted into the hinge casing (11) so as to be axially connected to the pivot rotation center of the door (10), as shown in FIGS. 17 and 18, so as to be linked to the rotation of the door (10). A spline projection (33a) is provided on the outer surface thereof to extend axially and fit into the groove (13) on the inner surface of the hinge casing (11). Accordingly, the upper linkage cam ring (33) rotates in conjunction with the rotation of the door (10), i.e., the hinge casing (11), and moves up and down by engaging contact with the upper fixed cam ring (32) during rotation.

[0145] The upper linkage cam ring (33) has a mountain and a valley formed on the upper surface that mesh with the mountain and valley formed on the lower surface of the upper fixed cam ring (32), and when the door (10) is in a fully open position, it rotates together with the door (10) and rises in the longitudinal direction of the upper hinge shaft member (31) as shown in FIG. 12, and when the door (10) is in a fully closed position, it descends in the longitudinal direction of the upper hinge shaft member (31) as shown in FIG. 14.

[0146] In this way, the upper interlocking cam ring (33) and the upper fixed cam ring (32) that are interlocked with each other have mountains and valleys formed on their contact surfaces, as shown in FIGS. 17 and 18. The upper interlocking cam ring (33) located below has mountains and valleys formed on its upper surface, as shown in FIG. 18, and conversely, the upper fixed cam ring (32) located above has valleys and mountains formed on its lower surface. At this time, the upper surface of the upper interlocking cam ring (33) has mountains and valleys formed alternately at 90-degree intervals, and the lower surface of the upper fixed cam ring (32) has valleys and mountains formed alternately at 90-degree intervals. In addition, the mountains of the upper interlocking cam ring (33) have mountain ridges (331) formed on their mountains, and the valley bottoms (332) formed on their valleys, and the upper fixed cam ring (32) also has valley bottoms (321) formed on the upper ends of its valleys, and the ridges (322) formed on the lower ends of its mountains. Here, since the ridges (331, 322) and the valley bottoms (332, 321) are flat, as shown in FIG. 12, when the door (10) is in the fully open position, the ridge (331) of the upper linkage cam ring (33) shown in FIG. 18 is positioned toward the valley bottom (321) of the upper fixed cam ring (32), and the valley bottom (332) of the upper linkage cam ring (33) is positioned toward the ridge (322) of the upper fixed cam ring (32). Conversely, as shown in FIG. 14, when the door (10) is in the fully closed position, the ridge (331) of the upper linkage cam ring (33) shown in FIG. 18 is in contact with the valley bottom (322) of the upper fixed cam ring (32). Accordingly, in the section where the ridge (322) and the ridge (331) are in contact and maintain their positions in the fully closed position of the door (10), the rod (342) of the shock absorber (34) described later is pressurized to the maximum extent so that the length of the rod (342) protruding from the body (341) is minimized.

[0147] As shown in Fig. 12, the shock absorber (34) is fixedly installed inside the hinge casing (11) at the bottom of the upper linkage cam ring (33), so that when the upper linkage cam ring (33) is lowered during the process of closing the door (10), the upper linkage cam ring (33) is lowered slowly. Various types of shock absorbers (34) can be used, and as an example, various known structures including a body (341) and a rod (342) can be used.

[0148] The rod (342) is installed so that a portion thereof protrudes from the body (341), and when no external force is applied to the rod (342), it protrudes as much as possible from the body (341), and when an external force is applied to the rod (342) in the longitudinal direction of the rod (342), that is, downward in FIGS. 12 to 14, a portion thereof is accommodated inside the body (341), and the length of the rod (342) protruding from the body (341) due to the external force becomes smaller.

[0149] Here, the tip (343) of the load (342) is preferably formed to be larger than the outer diameter of the load (342) so that the descending force of the upper linkage cam ring (33) can be more effectively transmitted to the load (342) when the upper linkage cam ring (33) descends. Unexplained reference numeral 344 is a control unit for controlling the pressure inside the body (341).

[0150] Fig. 12 shows the state of the upper linkage cam ring (33) and the shock absorber (34) when the door (10) is fully opened. The upper surface of the upper linkage cam ring (33) shown in Fig. 12 is slightly apart from the lower surface of the upper fixed cam ring (32), and the lower surface of the upper linkage cam ring (33) is in contact with the tip (343) of the shock absorber (34).In this state, when the door (10) is closed, the upper linkage cam ring (33) rotates along with the rotation of the door (10), and when the upper linkage cam ring (33) rotates, the upper linkage cam ring (33) continues to rotate in place until the inclined surface (333) of the upper linkage cam ring (33) comes into contact with the inclined surface (323) of the upper fixed cam ring (32), and when the upper linkage cam ring (33) rotates further, as shown in FIG. 13, the inclined surface (333) of the upper linkage cam ring (33) comes into engagement contact with the inclined surface (323) of the upper fixed cam ring (32), and when the upper linkage cam ring (33) descends, the upper linkage cam ring (33) is lowered by the rod (342) that was protruding from the body (341). As the tip (343) is pressed, the rod (342) protruding from the body (341) to the maximum is applied downward as shown in Fig. 13, and the length of the rod (342) protruding from the body (341) gradually becomes smaller, and as the door (10) is closed further, the upper linkage cam ring (33) is lowered further as shown in Fig. 14, and the ridge (322) of the upper fixed cam ring (32) and the ridge (331) of the upper linkage cam ring (33) come into contact, and at the same time, as shown in Fig. 14, the rod (342) protruding from the body (341) is lowered to the maximum, and an external force is applied downward, and the length of the rod (342) protruding from the body (341) becomes minimum, and in this process, the restoring force that was acting in the direction of closing the door (10) by the lower hinge (20) gradually becomes smaller. By reducing the closing speed of the door (10), the door (10) is closed slowly and accurately aligned with the center of the left door frame (2) of the door (10) without any misalignment.

[0151] Accordingly, when the door (10) is fully opened, the length of the rod (342) protruding from the body (341) is at its maximum, and when the door (10) is closed, the length of the rod (342) protruding from the body (341) gradually decreases, and when the door (10) is fully closed, the length of the rod (342) protruding from the body (341) is at its minimum.

[0152] Here, Fig. 19 shows an example of a state in which a spring (347) is wound around the outer circumference of the rod (342) of the shock absorber (34), and when the spring (347) is installed around the outer circumference of the rod (342) of the shock absorber (34) as shown in Fig. 19, when the door (10) is opened from a closed state, the rod (342) can be made to protrude upwardly from the body (341) of the shock absorber (34). The unexplained symbol 345 is a support member that prevents the shock absorber (34) from descending inside the hinge casing (11), 346 is a fixing screw for fixing the support member (345) to the hinge casing (11), and 39 is an upper door leaf connecting member that enables the upper hinge axis member (31) to be mounted on the door leaf (10), and as shown in FIG. 18, it is in the form of a combination of a ring (39a) and a plate body (39b), and a known upper door leaf connecting member (39) can be used, and an intermediate ring (38) is fitted between the inner circumference of the ring portion (39a) formed on the upper door leaf connecting member (39) and the outer circumference of the upper hinge axis member (31) so that the upper door leaf connecting member (39) can rotate on the outer circumference of the upper hinge axis member (31), and such The intermediary ring (38) may be a intermediary ring known in registered patent no. 10-2211918.

[0153] According to another embodiment of the present invention, a hinge structure of a swing door as shown in FIGS. 11 to 14 having a structure as described above, an upper hinge (30) is installed on the upper side of the swing door, and a lower hinge (20) is installed on the lower side of the swing door.

[0154] Referring to Fig. 12, Fig. 12 is a drawing showing the lower hinge (20) and the upper hinge (30) when the door leaf (10) of the door is in the fully open position, in which the lower hinge (20) has the lower spring (24) compressed while the ridge (231) of the lower linkage cam ring (23) engages with the ridge (221) of the lower fixed cam ring (22), and in the upper hinge (30), the rod (342) of the shock absorber (34) protrudes upward to the maximum, and the length of the protruded rod (342) reaches the maximum, and the upper linkage cam ring (33) rises upward so that the groove (332) of the upper linkage cam ring (33) remains close to the ridge (322) of the upper fixed cam ring (32).

[0155] When the user closes the door (10) in the state of FIG. 12, as shown in FIG. 12, since the contact area between the ridge (231) of the lower linkage cam ring (23) and the ridge (221) of the lower fixed cam ring (22) is relatively narrow, the lower linkage cam ring (23) is immediately moved from the open state to the closed state by the engagement contact of the inclined portions (223, 233) as shown in FIG. 13 and FIG. 16, even with a slight rotation by an external force, and then returns to the fully closed position of the door (10) in which the ridge (231) of the lower linkage cam ring (23) and the groove (232) of the lower fixed cam ring (22) are engaged as shown in FIG. 14. At this time, in order to reduce the closing speed of the door (10) by the restoring force of the lower spring (24), separately from the lower hinge (20), When the lower linkage cam ring (23) and shock absorber (34) are installed on the upper hinge (30), the closing speed of the door (10) is reduced by the action of the lower linkage cam ring (23) and shock absorber (34), so that the door (10) closes slowly and accurately without misalignment with the door frame (1). Here, when the door (10) is closed by the restoring force, the point in time when the restoring force begins to decrease is when the inclined surface (333) of the upper linkage cam ring (33) comes into contact with the inclined surface (323) of the upper fixed cam ring (32), and the restoring force is reduced from that point on, so that the door (10) closes slowly. Accordingly, by adjusting the degree of gap between the upper surface of the upper linkage cam ring (33) and the lower surface of the upper fixed cam ring (32), the point in time at which the door (10) slowly closes can be adjusted while the door (10) is being closed by the restoring force, and thereafter, the door (10) slowly closes until it is aligned with the center of the right door frame (1) without misalignment by the action of the lower linkage cam ring (23) and the shock absorber (34).

[0156] Meanwhile, FIGS. 20 to 22 are drawings illustrating another embodiment of an upper hinge (30). The upper hinge (30) illustrated in FIGS. 20 to 22 includes an upper hinge shaft member (31), an upper fixed cam ring (32), an upper linkage cam ring (33), an upper spring (44), a pressure member (45), and a shock absorber (34). Compared to the upper hinge (30) illustrated in FIGS. 12, 17, and 18, the upper hinge shaft member (31) has a different shape in part, and the upper spring (44) and the pressure member (45) are additionally installed on the outer periphery of the upper hinge shaft member (31), so that the structure is partially different. Here, components having the same structure as the upper hinge (30) illustrated in FIG. 18 in the upper hinge (30) illustrated in FIG. 20 to FIG. 22 will use the same drawing reference numerals, and only the different configurations will be described below.

[0157] In the upper hinge (30) illustrated in FIGS. 20 to 22, the upper hinge shaft member (31) is a shaft member that serves as the center of the upper hinge (30), and as illustrated in FIG. 22, is composed of a square portion (31a) formed at the upper end, a cylindrical body (31b) formed at the lower end of the square portion (31a), and a screw portion (31c) formed at the lower end of the cylindrical body (31b), and is inserted and mounted in the axial direction into the interior of the hinge casing (11) and is fixed so as not to rotate relative to the upper door frame (4).

[0158] The upper spring (44) installed on the outer periphery of the upper hinge shaft member (31) is compressed when the upper linkage cam ring (33) descends in the longitudinal direction of the upper hinge shaft member (31), is compressed to the maximum when the door (10) is completely closed, and is tensioned to the maximum when the door (10) is completely opened.

[0159] The pressure member (45) that is movably fitted into the outer circumference of the upper hinge shaft member (31) is fitted into the outer circumference of the upper hinge shaft member (31) so as to be spaced apart from the lower portion of the upper linkage cam ring (33), preferably the bearing (47), when the door (10) is fully opened, and when the door (10) is closed from the fully opened state, the upper linkage cam ring (33) is lowered along with the closing of the door (10), and as the upper linkage cam ring (33) is lowered, the bearing (47) located at the lower portion of the upper linkage cam ring (33) and the upper linkage cam ring (33) come into contact, and thereafter, when the upper linkage cam ring (33) continues to lower, the upper linkage cam ring (33) presses the upper end of the pressure member (45), thereby reducing the restoring force that closes the door (10), and thereafter, the door (10) is continuously closed. When this happens, the upper linkage cam ring (33) is lowered to the maximum extent, and the ridge (322) of the upper fixed cam ring (32) and the ridge (331) of the upper linkage cam ring (33) come into contact, and at the same time, the rod (342) protruding from the body (341) is subjected to an external force downward as the upper linkage cam ring (33) is lowered to the maximum extent, and the length of the rod (342) protruding from the body (341) becomes minimum, and in this process, the restoring force acting in the direction of closing the door (10) by the lower hinge (20) gradually decreases, thereby reducing the closing speed of the door (10) and allowing the door (10) to close slowly. When the door (10) is closed by the restoring force, the point in time when the restoring force begins to decrease is when the upper linkage cam ring (33), more specifically, the bearing (47) at the bottom of the upper linkage cam ring (33), comes into contact with the upper surface of the pressure member (45), and the restoring force is reduced, so that the door (10) closes slowly. Therefore, by adjusting the degree of separation between the lower surface of the bearing (47) installed at the lower portion of the upper linkage cam ring (33) and the upper surface of the pressure member (45), the point in time when the door (10) closes slowly can be adjusted.

[0160] Here, when the pressure member (45) is lowered downward, the lower part of the pressure member (45) presses the tip (343) of the rod (342) of the shock absorber (34). The lower part of the pressure member (45) for pressing the tip (343) of the rod (342) can be formed in various ways, for example, the bottom surface of a cylindrical portion can be formed as a flat surface, and in addition, the lower part of the pressure member can be formed as a pressure member capable of pressing the tip (343) of the rod (342) of various structures.

[0161] Meanwhile, the above description describes a case where one of the lower hinge (20) and the upper hinge (30) is the lower hinge (20) and the other is the upper hinge (30). Conversely, as shown in FIG. 23, one of the lower hinge (20) and the upper hinge (30) may be the upper hinge (30) and the other may be the lower hinge (20). The upper hinge (30) and the lower hinge (20) in such a case will be described below.

[0162] Referring to Fig. 23, Fig. 23 shows the upper hinge (30) and the lower hinge (20) when the door (10) is fully open.

[0163] In Fig. 23, the upper hinge (30) is installed on the upper side of the door leaf (10), and when the door leaf (10) rotates, it rotatably supports the upper part of the door leaf (10) with respect to the door frame (1), preferably the upper door frame (4), and when the external force that opens the door leaf (10) is removed while opening the door leaf (10), a restoring force acts in the direction in which the door leaf (10) closes, so that the door leaf (10) closes. As shown in Figs. 23 to 25, the upper hinge shaft member (31), the upper fixed cam ring (32), the upper linked cam ring (33), and the upper spring (44) are included, and the upper hinge (30) having the above configuration is different from the upper hinge (30) shown in Fig. 22 only in the configuration of the pressure member (45) and the shock absorber (34), and the remaining configurations are all the same in structure, so that Figs. 23 to 25 In the upper hinge (30) illustrated in FIG. 25, all components identical to those in the upper hinge (30) illustrated in FIG. 22 are designated by the same drawing reference numerals, and since the upper hinge (30) illustrated in FIG. 23 can utilize the hinge structure disclosed in the registered patent no. 10-2211918, a detailed description of the detailed configuration of the upper hinge (30) is omitted.

[0164] In Fig. 23, the lower hinge (20) is installed on the lower side of the door leaf (10), and when the door leaf (10) rotates, it rotatably supports the lower part of the door leaf (10) with respect to the right door frame (3) of the door frame (1), and when the door leaf (10) is closed, it closes more slowly than when the door leaf (10) is closed by the restoring force. Various structures can be used, and as an example, it includes a lower hinge shaft member (21), a lower fixed cam ring (22), a lower linked cam ring (23), and a shock absorber (240) as shown in Figs. 23, 26, and 27.

[0165] In Fig. 23, the lower hinge shaft member (21), the lower fixed cam ring (22), and the lower linkage cam ring (23) are the same as the lower hinge shaft member (21), the lower fixed cam ring (22), and the lower linkage cam ring (23) that constitute the lower hinge (20) described in Fig. 12 described above, so both use the same drawing reference numerals, and a detailed description thereof refers to the content described above.

[0166] In Fig. 23, the shock absorber (240) of the lower hinge (20) is fixedly installed inside the hinge casing (11) at the upper portion of the lower linkage cam ring (23), so that when the lower linkage cam ring (23) rises during the process of closing the door (10), the lower linkage cam ring (23) slowly rises. Various known structures including a body (241) and a rod (242) can be used.

[0167] The rod (242) is installed so that a portion thereof protrudes from the body (241), and when no external force is applied to the rod (242), it protrudes as much as possible from the body (241), and when an external force is applied to the rod (242) in the longitudinal direction of the rod (242), i.e., upward in FIG. 23, a portion thereof is accommodated inside the body (241), and the length of the rod (242) protruding from the body (241) due to the external force becomes smaller.

[0168] Here, it is preferable that the tip (243) of the load (242) be formed larger than the outer diameter of the load (242) so that the upward force of the lower linkage cam ring (23) can be more effectively transmitted to the load (242) when the lower linkage cam ring (23) rises.

[0169] The detailed operation of the shock absorber (240) as described above is the same as that of the shock absorber (34) illustrated in FIGS. 12 to 14 described above, and therefore, a description thereof will be omitted. Unexplained reference numeral 245 denotes a support member that prevents the shock absorber (240) from rising upward, and 246 denotes a fixing screw that fixes the support member (245) to the hinge casing (11).

[0170] The lower hinge (20) illustrated in FIG. 23 rotatably supports the lower portion of the door leaf (10) with respect to the right door frame (3), and the lower hinge axis member (21) described above is fixedly connected to the right door frame (3) of the door frame (1) so that it cannot rotate relative to the door frame. Various examples can be used for the structure in which the lower hinge axis member (21) is fixedly connected to the right door frame (3) so that it cannot rotate relative to the door frame. As an example, a lower fitting plate (40) and a lower door frame member (50) can be used as illustrated in FIGS. 26 and 27.

[0171] Here, the lower fitting plate (40) and the lower door frame member (50) may be of the same structure as the lower fitting plate (40) and the lower door frame member (50) illustrated in FIGS. 15 and 16, so their description is omitted.

[0172] While specific implementations of the present invention have been described above with examples, these are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. It will be apparent to those skilled in the art that various substitutions, modifications, and alterations are possible without departing from the technical spirit of the present invention.

[0173] The present invention is a useful invention that can provide a hinge structure for a swing door that, when an external force that opens the door is removed while the door is being opened, causes a restoring force to act in the direction in which the door is closed, so that the door closes more slowly than when it is closed by the restoring force.

Claims

1. Door frame (1); A door leaf (10) that is rotatably installed on one side of the door frame (1) and opens and closes the opening of the door frame (1); An upper hinge casing (11) fixedly attached to the upper side of the door (10) and having a plurality of grooves (11a) (11b) formed longitudinally and spaced apart from each other inside; A lower hinge casing (15) fixedly attached to the lower side of the door (10) and having a plurality of grooves (15a) (15b) formed longitudinally and spaced apart from each other inside; A lower hinge (20) which is installed so that at least a portion of the lower hinge casing (15) is fitted therein, and when the door (10) rotates, it rotatably supports the lower portion of the door (10) with respect to the door frame (1), and when an external force that opens the door (10) is removed while the door (10) is being opened, it generates a restoring force that closes the door (10), thereby closing the door (10); and A hinge structure for a swing door, characterized by including an upper hinge (30) which is installed by being fitted at least partially inside the upper hinge casing (11), rotatably supports the upper portion of the door (10) with respect to the door frame (1) when the door (10) rotates, and controls a restoring motion for closing the door (10) by the restoring force when the door (10) is closed.

2. In claim 1, The upper hinge (30) above, An upper hinge axis member (31) that is fixedly installed by being inserted in the axial direction into the interior of the upper hinge casing (11) so that it cannot rotate relative to the upper door frame (4) of the above door frame (1); An upper fixed cam ring (32) that is fixedly mounted around the circumference of the upper hinge shaft member (31) so as not to rotate relative to the upper hinge shaft member (31) and inserted into the interior of the upper hinge casing (11); An upper linkage cam ring (33) inserted into the interior of the upper hinge casing (11) so as to be able to be lifted and rotated from the lower portion of the upper fixed cam ring (32), and when the door (10) is closed, it is engaged with the upper fixed cam ring (32) and descends in the longitudinal direction of the upper hinge shaft member (31); and A hinge structure of a swing door characterized by including a shock absorber (34) which is fixedly installed inside the hinge casing (11) at the lower end of the upper linkage cam ring (33) and controls the lowering motion of the upper linkage cam ring (33) when the upper linkage cam ring (33) is lowered during the closing process of the door (10).

3. In claim 2, A hinge structure of a swing door, characterized in that the upper linkage cam ring (33) is fitted into the interior of the upper hinge casing (11) so that the upper surface of the upper linkage cam ring (33) does not come into contact with the lower surface of the upper fixed cam ring (32) when the door (10) is fully opened.

4. In claim 2 or claim 3, The above show bar (34) is, A hinge structure of a swing door characterized in that when the door (10) is fully opened, the length of the rod (342) protruding from the body (341) becomes maximum, and when the door (10) is closed, the length of the rod (342) protruding from the body (341) gradually becomes smaller, and when the door (10) is fully closed, the length of the rod (342) protruding from the body (341) becomes minimum.

5. In claim 4, The above shock absorber (34) includes a control unit (80) for controlling the lifting speed of the load, The above control unit (80) is An adjustment casing (81) fixedly installed at the bottom of the body (341) of the above shock absorber (34); A first gear (82) rotatably accommodated inside the above-mentioned control casing (81) and for controlling the lifting speed of the above-mentioned load (342); A second gear (83) rotatably installed inside the above-mentioned control casing (81) to rotate the first gear (82); and A hinge structure for a swing door, characterized in that it includes a rotating part (84) installed at one end of a gear shaft (83a) of the second gear (83) to rotate the second gear (83).

6. In claim 5, A hinge structure of a swing door, characterized in that the above rotating part (84) can rotate through a through hole (11c) formed on one side of the upper hinge casing (11).

7. In claim 1, A hinge structure of a swing door, characterized in that the restoration action of closing the door (10) includes a temporary stop action in which the closing speed of the door (10) decreases during the closing process of the door (10) to temporarily stop the door (10) from closing.

8. In claim 2, A hinge structure of a swing door, characterized in that the upper linkage cam ring (33) is fitted into the interior of the upper hinge casing (11) so that the upper surface of the upper linkage cam ring (33) comes into contact with the lower surface of the upper fixed cam ring (32) when the door (10) is fully opened.

9. Door frame (1); A door leaf (10) having a hinge casing (11) attached thereto, which is rotatably installed on one side of the door frame (1) to open and close the opening of the door frame (1), and which is formed hollow on one side and has a plurality of grooves (12) formed longitudinally and spaced apart from each other inside; An upper hinge (30) installed on the upper side of the door (10) and rotatably supporting the upper part of the door (10) with respect to the door frame (1) when the door (10) rotates; and It includes a lower hinge (20) that is installed on the lower side of the door (10) and rotatably supports the lower part of the door (10) with respect to the door frame (1) when the door (10) is rotated; When the external force that opens the door (10) is removed while opening the door (10), one of the upper hinge (30) and the lower hinge (20) causes a restoring force to act in the direction in which the door (10) closes, thereby closing the door (10). A hinge structure of a swing door, characterized in that the remaining one of the upper hinge (30) and the lower hinge (20) closes the door (10) more slowly than when the door (10) is closed by the restoring force when the door (10) is closed.

10. In claim 9, A hinge structure of a swing door, characterized in that one of the upper hinge (30) and the lower hinge (20) is the lower hinge (20), and the other of the upper hinge (30) and the lower hinge (20) is the upper hinge (30).

11. In claim 10, The upper hinge (30) above, An upper hinge shaft member (31) that is inserted and installed in the axial direction inside the above hinge casing (11) and is fixed so as not to rotate relative to the upper door frame (4) of the above door frame (1); An upper fixed cam ring (32) that is fitted around the circumference of the upper hinge shaft member (31) so as not to rotate relative to the surroundings; An upper linkage cam ring (33) that is fitted so as to be able to be lifted and rotated at the bottom of the upper fixed cam ring (32), and when the door (10) is closed, is lowered in the longitudinal direction of the upper hinge shaft member (31) while engaging with the upper fixed cam ring (32); and A hinge structure of a swing door characterized by including a shock absorber (34) which is fixedly installed inside the hinge casing (11) at the lower end of the upper linkage cam ring (33) so that when the upper linkage cam ring (33) is lowered during the closing process of the door (10), the upper linkage cam ring (33) is slowly lowered.

12. In claim 11, The above show bar (34) is, A hinge structure of a swing door characterized in that when the door (10) is fully opened, the length of the rod (342) protruding from the body (341) is maximum, and when the door (10) is closed, the length of the rod (342) protruding from the body (341) gradually decreases, and when the door (10) is fully closed, the length of the rod (342) protruding from the body (341) is minimum.

13. In claim 10, The above lower hinge (20) is A lower hinge axis member (21) that is inserted and installed in the axial direction inside the above hinge casing (11) and is fixed so as not to rotate relative to the right door frame (3); A lower fixed cam ring (22) that is fitted around the circumference of the lower hinge shaft member (21) so as not to rotate relative to the surroundings; A lower linkage cam ring (23) that is fitted around the lower hinge shaft member (21) so as to be able to be lifted and rotated from the upper portion of the lower fixed cam ring (22), and when the door (10) is opened by engaging with the lower fixed cam ring (22), it rotates together with the door (10) and rises in the longitudinal direction of the lower hinge shaft member (21), and when the external force for opening the door (10) is removed, it descends in the longitudinal direction of the lower hinge shaft member (21); and A hinge structure of a swing door, characterized by including a lower spring (24) that is flexibly fitted around the circumference of the lower hinge shaft member (21) at the upper portion of the lower linkage cam ring (23), is compressed when the lower linkage cam ring (23) rises in the longitudinal direction of the lower hinge shaft member (21), and is tensioned in the longitudinal direction of the lower hinge shaft member (21) when an external force for opening the door (10) is removed during opening of the door (10), thereby closing the door (10).

14. In claim 10, The upper hinge (30) above, An upper hinge shaft member (31) that is inserted and installed in the axial direction inside the above hinge casing (11) and is fixed so as not to rotate relative to the upper door frame (4) of the above door frame (1); An upper fixed cam ring (32) that is fitted around the circumference of the upper hinge shaft member (31) so as not to rotate relative to the surroundings; An upper linkage cam ring (33) which is fitted around the upper hinge shaft member (31) at the lower portion of the upper fixed cam ring (32) so as to be able to be lifted and rotated, and which is engaged with the upper fixed cam ring (32) so that when the door (10) is opened, it rotates together with the door (10) and rises in the longitudinal direction of the upper hinge shaft member (31), and when an external force for opening the door (10) is removed, it descends in the longitudinal direction of the upper hinge shaft member (31); An upper spring (44) fitted around the circumference of the upper hinge shaft member (31) at the lower end of the upper linkage cam ring (33) and compressed when the upper linkage cam ring (33) descends in the longitudinal direction of the upper hinge shaft member (31); A pressure member (45) that is movably fitted around the circumference of the upper hinge shaft member (31) at the lower end of the upper linkage cam ring (33), and when the upper linkage cam ring (33) is lowered, the pressure member (45) is lowered downward by the force of the upper linkage cam ring (33); and A hinge structure of a swing door characterized by including a shock absorber (34) which is fixedly installed inside the hinge casing (11) at the lower end of the pressure member (45) and allows the upper linkage cam ring (33) and the pressure member (45) to slowly descend when the pressure member (45) is lowered by the upper linkage cam ring (33) during the closing process of the door (10).

15. In claim 9, A hinge structure of a swing door, characterized in that one of the upper hinge (30) and the lower hinge (20) is the upper hinge (30), and the other of the upper hinge (30) and the lower hinge (20) is the lower hinge (20).

16. In claim 15, The above lower hinge (20) is A lower hinge axis member (21) that is inserted and installed in the axial direction inside the above hinge casing (11) and is fixed so as not to rotate relative to the right door frame (3); A lower fixed cam ring (22) that is fitted around the circumference of the lower hinge shaft member (21) so as not to rotate relative to the surroundings; An upper linkage cam ring (33) that is fitted inside the hinge casing (11) to enable lifting and rotation in the lower fixed cam ring (22) and, when the door (10) is closed, engages with the lower fixed cam ring (22) and rises in the longitudinal direction of the lower hinge shaft member (21); and A hinge structure of a swing door characterized by including a shock absorber (240) that is fixedly installed inside the hinge casing (11) at the upper portion of the upper linkage cam ring (33) so that when the lower linkage cam ring (23) rises during the closing process of the door (10), the upper linkage cam ring (33) slowly rises.

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