Non-directional hydraulic automatic hinge

Abstract

The present invention relates to a left-right installed hydraulic automatic hinge that is installed on an interior hinged door of a building and uses hydraulic pressure to cause the door to close slowly after it is opened, while allowing the hinged door to open in only one direction regardless of whether it is installed on the left or right side of the door frame. A door hinge part comprising a door fixing plate installed on a hinged door, and an upper rotating tube and a lower rotating tube formed in a cylindrical shape and provided on both the upper and lower sides of the door fixing plate; a fixed hinge part comprising a door frame fixing plate fixed to one side of the left or right of the door frame, and a fixed tube formed in a cylindrical shape connected to the door frame fixing plate and positioned between the upper rotating tube and the lower rotating tube; a cylinder having a lower oil reservoir formed therein for storing oil; a lifting member including a piston that moves up and down, a lifting shaft, and a spring; an inner body having an upper oil reservoir formed therein for storing oil; a lifting body connected to the lifting shaft of the lifting member and provided on the upper part of the inner body; and a rotating body formed in a cylindrical shape with a center hole into which the lifting body is inserted, and having a V-shaped cam groove formed therein for converting the rotational movement of the door hinge part into the up-and-down movement of the lifting body; and is characterized by being installed on a door frame so as to be opened to only one side.

Description

Technology Field

[0001] The present invention relates to a left-right installed hydraulic automatic hinge, and more specifically, to a left-right installed hydraulic automatic hinge that is installed on an interior door of a building such as a building, apartment, or house, and uses hydraulic pressure to allow the door to close slowly using hydraulics when the door is automatically closed by the elastic force of a spring after it is opened, while allowing the door to open in only one direction regardless of whether it is installed on the left or right side of the door frame. Background Technology

[0003] In homes equipped with standard hinges, people often leave doors open. However, if a door is slammed shut by a strong wind, it creates a loud noise that startles the people inside.

[0005] This is due to the hinge installed on the door being configured to allow rotation on both sides of the central axis. In other words, the speed at which the door closes varies depending on the magnitude of the force applied when closing the door. This is because strong winds entering the interior through the open exterior door continuously apply pressure to the door, accelerating the closing speed. Furthermore, when the door closes, the kinetic energy generated from the acceleration is converted into impact energy as the door comes to a stop the moment it hits the door frame, causing a loud noise.

[0007] In addition, there are always risk factors, such as people passing by a door that closes rapidly due to strong winds being struck by the closing door and suffering bruises, or children's hands being caught between the door and the door frame and suffering fractures, and there is a problem that pregnant women or the elderly are startled by the noise generated.

[0009] Accordingly, hydraulic automatic door closes have been developed; however, hydraulic automatic door closes have problems such as a complex configuration and an unsightly appearance because the installed unit protrudes from the outside of the door, and increased economic burden due to the complex installation process caused by the need to install both the hydraulic automatic door close and hinges in a double manner.

[0011] To resolve these problems, a hydraulically operated damping hinge was developed. The hydraulically operated damping hinge provides cushioning when the door closes, allowing the door to close slowly over a certain distance before suddenly accelerating to lock into the locking mechanism. At the same time, it allows for the free adjustment of the fluid flow rate and spring strength. It is installed by connecting it to the door frame and the door, causing the door to close due to the elastic force of the coil spring when opened. During this process, the rotation axis rotates along with it, driving a bevel gear installed inside the cylinder to lower the piston. Consequently, the oil inside the cylinder moves to the upper part of the piston, causing the door to close slowly by hydraulic pressure.

[0013] However, hydraulic damping hinges utilize a structure based on hydraulics and springs; since the hydraulic system is very complex, it requires precise work during manufacturing, which leads to problems such as reduced productivity and high production costs.

[0015] Meanwhile, Public Patent No. 10-2000-0012857 describes a mechanism in which right-turn spiral protruding cams are formed on both sides of a rotating shaft installed on a hinge body and inserted into right-turn spiral guide grooves formed in a reciprocating operating tube; left-turn spiral guide grooves are formed on both outer sides of the reciprocating operating tube and guide protruding pieces formed at a leftward inclination on both lower sides of a fixed tube are inserted therein. Consequently, when the reciprocating operating tube descends or ascends according to the rotation of the rotating shaft, a piston formed at the lower end of the reciprocating operating tube or installed separately reciprocates up and down within a cylinder, moving oil to the upper or lower part of the piston; simultaneously, a cushioning effect occurs due to the hydraulic pressure acting during the oil movement, causing the door to close slowly; the load caused by the hydraulic pressure acting on the rotating shaft is applied uniformly to the rotating shaft, preventing damage to the spiral guide grooves, spiral cams, and inner protruding pieces during the process of the rotating shaft rotating left and right; and if a fire occurs and the temperature rises above a certain level, the door closes automatically to prevent the spread of flames. We propose and disclose a hydraulic automatic buffer hinge that can minimize property damage and human casualties by reducing them to the maximum extent, and

[0017] Published Patent No. 10-2001-0010512 describes a door-close type hydraulic system configured to allow the door to close slowly and automatically after opening, without exceeding a set speed, by providing a shaft formed to be inserted into an upper rotating cylinder and rotated by a lower rotating cylinder and a fixed cylinder, a connecting tube having a threaded portion formed to be inserted into the lower part of the lower rotating cylinder and screw-coupled to a threaded portion formed within the lower part of the fixed cylinder, and a nut portion formed to be coupled to a screw formed at the lower part of the shaft, a plug having a threaded portion formed to be screw-coupled to a threaded portion formed within the lower part of the connecting tube, a piston formed on the shaft to form an upper fluid chamber and a lower fluid chamber while the shaft is coupled to the fixed cylinder, a guide member fixed to the upper part of the shaft by a fixing pin to prevent the shaft from slipping out of the lower part of the upper rotating cylinder and to allow the shaft to rotate, and a detachment prevention plug having a bolt portion formed to be coupled to a nut portion formed on the upper rotating cylinder to prevent a spring that elastically supports the guide member and returns it to its original position from detaching from the upper rotating cylinder. We are proposing and disclosing a hinge,

[0019] Published Patent No. 10-2001-0027832 comprises a movable hinge plate installed on the door side and a fixed hinge plate installed on the door frame side, a plurality of cylindrical hinge knuckles formed at opposing ends of the hinge plates to bind the hinge plates together, an upper cap fixed to the upper part of the hinge knuckles, a compression spring installed within the hinge knuckles to provide rotational force of the door, a conversion head installed within the hinge knuckles to receive the repulsive force of the compression spring and installed through a guide pin fixed to the hinge knuckles and a guide slot to convert vertical movement caused by the compression spring into rotational movement, a piston rod having a piston head connected to the lower part of the conversion head via a guide pin and rotating together with the up and down movement of the conversion head, a stopper upper surface installed inside the hinge knuckles and sealed fixed by a lower cap to guide the piston head, and a stopper upper surface formed from the stopper upper surface and guided by the guide pin. The present invention proposes and discloses an automatic hinge comprising a cylinder having an opposing inclined guide groove formed therein, a hydraulic control pin assembled by sealing within the hollow portion of the piston rod to control the hydraulic fluid in the cylinder together with the piston rod, a return valve and a safety valve installed in the piston head to return the hydraulic fluid, and a control valve installed in the lower cap, wherein the door is automatically closed while controlling the speed and simultaneously functions as a stopper when the door is opened to provide convenience in use when opening and closing the door, and performs a security function when the door is opened to protect life and property.

[0021] Published Patent No. 10-2004-0025290 comprises: a door fixing device equipped with a door fixing piece and a rotating cylinder; a door frame fixing device equipped with a support cylinder and a door frame fixing piece; a cylinder embedded to form a gap in the rotating cylinder and equipped with an oil discharge port and an oil inlet port; a control screw coupled to the cylinder to regulate the oil discharge amount; a shaft fitted into the support cylinder and a piston embedded to be movable up and down in the cylinder, having a spiral groove that is spirally coupled to the cylinder by a guide pin; a check valve that opens and closes the fluid path of the piston; a connector fitted between the rotating cylinder and the support cylinder; a rotation prevention device embedded in the lower part of the support cylinder to prevent rotation of the shaft; and a spring and a detachment prevention ring mounted on the lower part of the shaft. A hydraulic hinge is proposed and disclosed, comprising caps respectively coupled to the upper part of a rotating cylinder and the lower part of a supporting cylinder, which allows the door to open and close slowly through the cushioning action of hydraulics, thereby preventing the risk of safety accidents and simultaneously preventing damage to the door and door frame.

[0023] Registered Patent No. 10-0754295 comprises: a lower tube body formed by a lower large diameter section and an upper small diameter section having the same inner diameter, wherein a threaded section is formed at a midpoint of the inner surface and a mounting plate is formed on the outer side of the large diameter section; an upper tube body formed such that its inner diameter communicates with the lower large diameter hole and the upper small diameter hole, is coupled in the same axial direction as the lower tube body, has a spline section formed on the inner surface of the upper small diameter hole, and has a mounting plate on the outer side; and a piston formed within the lower tube body, wherein a threaded section is formed on its outer surface to be screw-coupled to the threaded section, a spline section is formed on the upper inner surface of an upwardly open central groove, and has a head section expanded on the outer side of the lower section and a check valve for unidirectional oil guidance on the bottom surface of the head section. A hydraulic hinge for a door is proposed and disclosed, comprising: a middle large diameter portion coupled to the inner circumference of an upper small diameter portion via an O-ring, a spline shaft formed on the upper side thereof that is vertically coupled to the spline portion of the upper small diameter hole so as not to rotate, and a spline portion provided on the lower side that is vertically coupled to the spline portion of the piston so as not to rotate to guide the vertical movement of the piston; an upper cap having a fixing bolt coupled to the upper end of the upper tube body and screw-coupled to the upper end of the rotation-preventing shaft; a hydraulic control member having a screw portion formed to be screw-coupled to the lower end of the lower tube body, and a hydraulic control screw rotatably coupled and fixed to the center of the bottom surface to open and close an oil passage hole; and a passage movement means for guiding internal oil vertically according to the rising and falling of the piston; wherein the overall outer diameter of the upper and lower tube bodies can be reduced, the number of parts can be significantly reduced, and the problem of injury caused by the sudden opening and closing operation of the door can be resolved. Prior art literature

[0025] Published Patent Application No. 10-2000-0012857 Published Patent Application No. 10-2001-0010512 Published Patent Application No. 10-2001-0027832 Published Patent Application No. 10-2004-0025290 Registered Patent Application No. 10-0754295 The problem to be solved

[0026] Accordingly, the present invention has been devised to solve the problems of the aforementioned prior art, and aims to provide a hydraulic automatic hinge that is installed on a hinged door for use inside various buildings, apartments, and houses, and uses hydraulic pressure to allow the door to close slowly when it is automatically closed by the elastic force of a spring after the door is opened.

[0027] In addition, the present invention has another objective of providing a hydraulic automatic hinge that allows the door to open or close slowly by causing oil to flow as the piston is raised as the hinged door rotates.

[0028] In addition, another objective of the present invention is to provide a hydraulic automatic hinge that allows the lifting member to move only up and down without rotating when the door is rotated.

[0029] In addition, the present invention aims to provide a hydraulic automatic hinge in which a coupling pin inserted into a cam groove moves smoothly when the door is rotated, thereby enabling the lifting member to move up and down. means of solving the problem

[0031] A left-right installed hydraulic automatic hinge according to the present invention for achieving the above objective comprises: a door hinge part consisting of a door fixing plate installed on a hinged door provided in a building, and an upper rotating tube and a lower rotating tube formed in a cylindrical shape and provided on both the upper and lower sides of the door fixing plate; a fixed hinge part consisting of a door frame fixing plate fixed to one side of the left or right of the door frame, and a fixed tube formed in a cylindrical shape connected to the door frame fixing plate and positioned between the upper rotating tube and the lower rotating tube; a cylinder located at the bottom of the lower rotating tube and having a lower oil storage part formed therein for storing oil; a lifting member provided within the lower oil storage part and comprising a piston that moves up and down, a lifting shaft, and a spring; an inner tube body provided with an upper oil storage part formed therein for storing oil that is pressed into the interior of the fixed tube; and a lifting body provided at the top of the inner tube body to which the lifting shaft of the lifting member is connected. It includes a rotating body formed in a cylindrical shape with a center hole into which a lifting body is inserted, which rotates integrally with the door hinge part and has a V-shaped cam groove formed therein to convert the rotational movement of the door hinge part into the up-and-down movement of the lifting body; and is characterized by being installed on a door frame so as to be opened to only one side.

[0032] Here, the lifting member may comprise a cylindrical piston provided within the lower oil storage portion of the cylinder, a lifting shaft installed vertically on the upper end of the piston and having a male threaded portion connected to the lifting body at the upper end, a fixed hinge portion coupled to the upper side of the cylinder to partition the upper oil storage portion and the lower oil storage portion and into which the lifting shaft is inserted so as to be liftable, and a spring provided between the lifting body and the fixed hinge portion that extends when the hinged door is opened and returns to an initial position when no external force is applied to the hinged door.

[0033] Here, the spring may be configured such that its upper end is connected to the lower end of the lifting body and its lower end is connected to the fixed hinge.

[0034] Here, the fixed hinge portion may have a male screw portion formed on the outside to be fastened to a female screw portion formed at the top of the cylinder, and may be provided with a plurality of flow passages so that the upper oil storage portion and the lower oil storage portion communicate with each other.

[0035] Here, the inner body is provided with a spline body having a spline groove formed on the upper inner side, and a spline coupling part formed on the lower part of the lifting body is coupled thereto so that the lifting body can move only up and down without rotating.

[0036] Here, a pin insertion hole can be horizontally formed in the lifting body, into which a coupling pin, with both ends inserted into the cam groove of the rotating body, is inserted.

[0037] Here, the cam groove can be formed to a size in which a roller ring, rotatably coupled to both ends of the coupling pin, is inserted and can rotate. Effects of the invention

[0039] The left-right installed hydraulic automatic hinge according to the present invention, when opening a swing door, rotates the door hinge part installed on the swing door, and the lifting body and lifting member move upward by means of a cam structure of a rotating body that rotates together with the door hinge part, thereby extending the spring; when the swing door is released, the extended spring is restored to its initial state, lowering the lifting body and lifting member, and the rotating body and door hinge part are rotated in the reverse direction through the cam structure of the rotating body to close the swing door. Furthermore, when the swing door is opened, oil from the upper oil reservoir moves to the lower oil reservoir through the flow path, and when the swing door is closed, oil from the lower oil reservoir moves to the upper oil reservoir through the flow path, thereby allowing the swing door to open or close slowly, preventing safety accidents that may occur when the swing door closes and preventing noise generation. Additionally, a V-shaped cam groove is formed in the rotating body, so that depending on the surrounding conditions, on the left or right side of the door frame By installing and determining the opening direction, a useful effect can be achieved that allows the hinged door to open smoothly.

[0040] According to the present invention, a useful effect can be achieved in which a lifting body is provided with a spline coupling part and coupled to a spline part of an inner cylinder, thereby allowing the lifting body to move only up and down without rotating together with the rotating body.

[0041] According to the present invention, the upper oil storage portion of the inner cylinder and the lower oil storage portion of the cylinder are partitioned by a fixed body, and oil flows only through a flow path formed in the fixed body, thereby achieving a useful effect in which the door opens or closes slowly.

[0042] According to the present invention, a roller ring coupled to a coupling pin that horizontally penetrates the lifting body is inserted into the cam groove of a rotating body, thereby enabling the coupling pin to move along the cam groove and thereby achieving a useful effect in which the lifting body is raised.

[0043] According to the present invention, a roller ring is coupled to a coupling pin and a cam groove is formed to a size into which the roller ring is inserted, thereby achieving a useful effect of allowing the coupling pin to move smoothly. Brief explanation of the drawing

[0045] FIG. 1 is an external perspective view of a left-right installed hydraulic automatic hinge according to the present invention. FIG. 2 is an external perspective view showing the left-right installed hydraulic automatic hinge according to the present invention in an open state rotated to the right. FIG. 3 is an external perspective view showing the left-right installed hydraulic automatic hinge according to the present invention in an open state rotated to the left. FIG. 4 is an exploded view of a left-right installed hydraulic automatic hinge according to the present invention. FIG. 5 is a cutaway perspective view showing the internal structure when a left-right installed hydraulic automatic hinge according to the present invention is installed on the right side of a door frame. FIG. 6 is a cutaway perspective view showing the internal structure when a left-right installed hydraulic automatic hinge according to the present invention is installed on the right side of a door frame and opened. FIG. 7 is a cutaway perspective view showing the internal structure when a left-right installed hydraulic automatic hinge according to the present invention is installed on the left side of a door frame. FIG. 8 is a cutaway perspective view showing the internal structure when a left-right installed hydraulic automatic hinge according to the present invention is installed on the left side of a door frame and opened. Specific details for implementing the invention

[0046] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0047] The terms used in this invention are defined in consideration of their functions within the invention; however, since these may vary depending on the intentions or practices of the user or operator, the definitions of these terms should be interpreted in a sense and concept consistent with the technical details of this invention.

[0048] FIGS. 1 to 4 of the attached drawings are drawings for explaining a left-right installed hydraulic automatic hinge according to an embodiment of the present invention, FIGS. 5 and 6 are drawings for explaining a case where a left-right installed hydraulic automatic hinge according to an embodiment of the present invention is installed on the right side of a door frame, and FIGS. 7 and 8 are drawings for explaining a case where a left-right installed hydraulic automatic hinge according to an embodiment of the present invention is installed on the left side of a door frame.

[0050] As shown in FIGS. 1 to 4, the left and right installed hydraulic automatic hinge according to the embodiment of the present invention comprises a door hinge part (10), a fixed hinge part (20), a cylinder (30), a lifting member (40), an inner body (50), a lifting body (60), and a rotating body (70), and is installed on a door frame separating the interior and the exterior so as to be opened to only one side, either the interior or the exterior side, preferably installed so as to be opened only to the exterior side.

[0052] The door hinge portion (10) is installed on a hinged door provided in a building and rotates as a single unit, and consists of a square-shaped door fixing plate (11) installed on the hinged door, and an upper rotating tube (12) and a lower rotating tube (13) formed in a cylindrical shape and provided on both the upper and lower sides of the door fixing plate (11).

[0053] At this time, it is preferable that the door fixing plate (11) be provided with a plurality of installation holes for installing screws, etc.

[0055] The fixed hinge portion (20) is installed on either the left or right side of the door frame and consists of a door frame fixing plate (21) fixed to the door frame and a fixing tube (22) formed in a cylindrical shape, connected to the door frame fixing plate (21), and positioned between the upper rotating tube (12) and the lower rotating tube (13).

[0056] At this time, it is natural that the door frame fixing plate (21) is also provided with multiple installation holes for installing screws, etc.

[0058] The cylinder (30) is located at the bottom of the lower rotating cylinder (13) that forms the rotating body (10), and a lower oil storage part (31) is formed on the inside in which oil is stored.

[0059] And, a female screw portion (32) is formed inside the upper side of the cylinder (30) so that a fixing body (44) described later can be fastened.

[0061] The lifting member (40) is raised and lowered according to the rotation of the door and is formed by including a piston (42) that is provided in the lower oil storage part (31) of the cylinder (30) and moves up and down, a lifting shaft (41), and a spring (45).

[0062] Specifically, the lifting member (40) comprises a cylindrical piston (42) provided within the lower oil storage section (31) of the cylinder (30), a lifting shaft (41) installed vertically on the upper end of the piston (42) and having a male screw section (43) to which the lifting body (60) is connected at the upper end, a fixed body (44) which is fastened to the upper female screw section (32) of the cylinder (30), divides the upper oil storage section (51) and the lower oil storage section (31), and into which the lifting shaft (41) is inserted so as to be liftable, and a spring (45) provided between the lifting body (60) and the fixed body (44) which extends when the hinged door is opened and returns to an initial position when no external force is applied to the hinged door.

[0064] At this time, the spring (45) is configured such that its upper end is connected to the lower end of the lifting body (60) and its lower end is connected to the fixed body (44), so that it extends when the lifting body (60) rises as the hinged door opens.

[0066] In addition, the lifting shaft (41) is provided with an enlarged portion (41') of a predetermined length at the lower side, which has a relatively expanded diameter to increase the connection area with the piston (42), thereby having a stepped shape.

[0067] And the fixed body (44) has a male screw portion (44') formed on the outside so as to be fastened to a female screw portion (32) formed at the top of the cylinder (30), and is provided with a plurality of flow passages (44") so as to allow the upper oil storage portion (51) and the lower oil storage portion (42) to communicate with each other.

[0068] Therefore, since the lifting shaft (41) is firmly connected to the piston (42) and the oil moves only through the passage (44), the speed at which the door closes is slowed down.

[0070] The inner body (50) is fixed by being pressed into the interior of the fixed body (22), and an upper oil storage section (51) in which oil is stored is formed on the inside.

[0071] And a spline part (53) is provided that is formed protruding at a position spaced apart from the top of the inner body (50) and has a plurality of spline grooves (53') formed on the inside.

[0073] The lifting body (60) is connected to the lifting shaft (41) and is raised and lowered, and is provided on the upper part of the inner body (50).

[0074] And on the upper side of the lifting body (60), a pin insertion hole (61) is horizontally formed so that a coupling pin (73) inserted into the cam groove (72) of the rotating body (70) can be inserted, and on the lower side of the lifting body (60), a spline coupling part (62) is provided and coupled to the spline part (53) of the inner body (50).

[0075] Therefore, the lifting body (60) moves only up and down without rotating.

[0077] The rotating body (70) is formed in a cylindrical shape having a center hole (71) into which the lifting body (60) is inserted, and rotates integrally with the rotating body (10).

[0078] And a cam groove (72) is formed to convert the rotational movement of the pivot body (10) into the up-and-down movement of the lifting body (60).

[0079] At this time, it is preferable that the cam groove (73) be formed in a size such that a roller ring (74), which is rotatably coupled to both ends of the coupling pin (73), can be inserted and rotated.

[0081] Accordingly, the installation of a left-right installed hydraulic automatic hinge according to the present invention, which is configured as described above, on a door frame and the opening and closing of a building's hinged door using the left-right installed hydraulic automatic hinge are explained as follows.

[0082] When installing a hinged door on a door frame, the opening direction and installation location are determined by considering the surrounding conditions of the door frame.

[0083] And, the fixed hinge part (20) is installed eccentrically on the outdoor or indoor side of the door frame so that the hinged door opens only to the outdoor side or only to the indoor side.

[0085] When the hinged door is opened to the outside and there is an obstacle on the outer left side of the door frame, as shown in FIGS. 5 and 6, a fixed hinge part (20) is installed on the front left side of the door frame so that the door hinge part (10) rotates to the right.

[0086] However, if there is an obstacle on the outer right side of the door frame, as shown in FIGS. 7 and 8, a fixed hinge part (20) is installed on the front right side of the door frame so that the door hinge part (10) can rotate to the left.

[0087] Conversely, if the hinged door cannot be opened to the outside, the installation location is determined based on the internal conditions of the door frame.

[0089] Meanwhile, when the hinged door is opened, the door hinge part (10) rotates due to the door fixing plate (11) installed on the hinged door, and the rotating body (70) coupled to the upper rotating tube (12) of the door hinge part (10) rotates at the same time.

[0090] And, the connecting pin (73), with both ends inserted into the V-shaped cam groove (72) of the rotating body (70), does not rotate together with the rotating body (70) when it rotates, but moves upward along the cam groove (72).

[0092] Accordingly, the lifting body (60) with the connecting pin (73) installed moves upward, and the lifting shaft (41) and piston (42) of the lifting member (40) connected to the lifting body (60) rise.

[0093] And a spring (45) with one end connected to the lifting body (60) extends as the lifting body (60) rises, and the upper end of the lifting body (60) protrudes upward toward the rotating body (70).

[0095] Additionally, as the piston (42) and the lifting shaft (41) of the lifting member (40) rise, the pressure in the upper oil storage section (51) of the inner body (50) increases and the pressure in the lower oil storage section (31) decreases, so the oil in the upper oil storage section (51) moves to the lower oil storage section (31) of the cylinder (30) through the flow path (44) of the fixed body (44).

[0096] Therefore, the amount of oil flowing through the Euro port (44) acts as a factor determining the opening speed of the swing door.

[0098] Afterwards, when the hinged door is released and no external force is applied, the extended spring (45) returns to its initial shape and contracts, and accordingly, the lifting body (60) descends.

[0099] When the lifting body (60) descends, the connecting pin (73) descends along the inclined surface of the V-shaped cam groove (72) to the lower part, so the rotating body (70) to which the connecting pin (73) is connected is rotated by the cam structure.

[0100] Accordingly, the door hinge part (10) combined with the rotating body (70) and the hinged door rotate as a single unit, causing the hinged door to close.

[0102] And as the lifting shaft (41) and piston (42) connected to the lifting body (60) are lowered, the pressure in the upper oil storage unit (51) decreases and the pressure in the lower oil storage unit (31) increases, so the oil in the lower oil storage unit (31) moves to the upper oil storage unit (51) through the flow path (44) of the fixed body (44).

[0103] Therefore, the amount of oil flowing through the Euro (44) acts as a factor in determining the speed at which the door closes.

[0105] At this time, since the lower part of the lifting shaft (41) is formed as an expanded part (41), initially a relatively large amount of oil flows, causing the hinged door to close quickly, and later less oil flows, causing the hinged door to close slowly.

[0107] The embodiments described above are merely illustrative of preferred embodiments of the present invention and are not strictly limited to such embodiments. Various modifications and variations may be made by those skilled in the art within the technical spirit and scope of the claims of the present invention, and such modifications and variations fall within the technical scope of the present invention. Explanation of the symbols

[0109] 10: Door hinge part 11: Door fixing plate 12: Upper rotating drum 13: Lower rotating drum 20: Fixed hinge part 21: Door frame fixing plate 22 : Fixed tube 30 : Cylinder 31: Lower oil reservoir 32: Female thread section 40 : Lifting member 41 : Lifting shaft 41' : Expanding section 42 : Piston 43: Male screw part 44: Fixing body 44' : Male screw thread 44" : Euro hole 45 : Spring 50 : Inner body 51: Upper oil reservoir 52: Fixing screw section 53 : Spline section 53' : Spline groove 60 : Lifting body 61 : Pin insertion hole 62 : Spline joint 70 : Rotating body 71 : Center hole 72 : V-shaped cam home 73 : Connecting pin 74 : Rollering

Claims

Claim 1 A door hinge part comprising a door fixing plate installed on a hinged door provided in a building, and an upper rotating tube and a lower rotating tube formed in a cylindrical shape and provided on both the upper and lower sides of the door fixing plate; a fixing hinge part comprising a door frame fixing plate fixed to one side of the left or right of the door frame, and a fixing tube formed in a cylindrical shape connected to the door frame fixing plate and positioned between the upper rotating tube and the lower rotating tube; a cylinder located at the bottom of the lower rotating tube and having a lower oil reservoir formed therein for storing oil; a lifting member provided within the lower oil reservoir and comprising a piston that moves up and down, a lifting shaft, and a spring; an inner body provided that is pressed into the interior of the fixing tube and has an upper oil reservoir formed therein for storing oil; and a lifting body provided at the top of the inner body to which the lifting shaft of the lifting member is connected. A left-right installed hydraulic automatic hinge characterized by comprising: a rotating body formed in a cylindrical shape having a center hole into which a lifting body is inserted, rotating integrally with the door hinge part, and having a V-shaped cam groove formed therein to convert the rotational movement of the door hinge part into the up-and-down movement of the lifting body; and installed on a door frame to open to only one side. A left-right installed hydraulic automatic hinge characterized by the inner body having a spline body with a spline groove formed on the upper inner side, and a spline coupling part formed on the lower part of the lifting body being coupled thereto so that the lifting body does not rotate but moves only up and down. Claim 2 A left-right installed hydraulic automatic hinge according to claim 1, wherein the lifting member comprises a cylindrical piston provided within the lower oil storage portion of a cylinder, a lifting shaft installed vertically at the upper end of the piston and having a male screw portion connected to a lifting body at the upper end, a fixed hinge portion coupled to the upper side of the cylinder to partition the upper oil storage portion and the lower oil storage portion and into which the lifting shaft is inserted to be vertically movable, and a spring provided between the lifting body and the fixed hinge portion that extends when the hinged door is opened and returns to an initial position when no external force is applied to the hinged door. Claim 3 A left-right installed hydraulic automatic hinge according to claim 2, characterized in that the spring is configured such that its upper end is connected to the lower end of the lifting body and its lower end is connected to the fixed hinge part. Claim 4 A left-right installed hydraulic automatic hinge according to claim 1, characterized in that the fixed hinge portion has a male screw portion formed on the outside to be fastened to a female screw portion formed at the top of the cylinder, and has a plurality of flow passages so that the upper oil storage portion and the lower oil storage portion communicate with each other. Claim 5 delete Claim 6 A left-right installed hydraulic automatic hinge according to claim 1, characterized in that a pin insertion hole is horizontally formed in the lifting body, into which a coupling pin, into which both ends are inserted into the cam groove of the rotating body, is inserted. Claim 7 A left-right installed hydraulic automatic hinge according to claim 6, characterized in that the cam groove is formed to a size in which a roller ring rotatably coupled to both ends of a coupling pin is inserted and can rotate.

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