KR20030080118A - Auto door closer - Google Patents

Abstract

PURPOSE: A separable hydraulic auto-door closer is provided to reduce the manufacturing cost by excluding unnecessary progresses and replacing components easily. CONSTITUTION: The separable hydraulic auto-door closer comprises: a door bearing member(10) provided with a doorframe bracket(11) and an outer housing(12) and fixed to a doorframe; a door moving member(20) provided with a door bracket(21) and fixed to a door; a lead screw(40) fixed on the outer housing(12) of the door bearing member(10) and provided with spirals(44); a cylinder member(30) formed to have a gap with an inner circumference of the outer housing(22) and filled up with pressure oil; a piston(50) provided with a check valve(51) and making a linear motion by the rotation of the door moving member(20); a piston guide(54) guiding a linear motion of the piston(50); and a hydraulic control member(60) formed on the cylinder member(30) and screwed on the inside of the outer housing(22) of the door moving member(20).

Description

Separate hydraulic and compression spring auto door closer {Auto door closer}

The present invention relates to a separable hydraulic type and a compression spring type automatic door closer for allowing the door to be opened and closed smoothly, and more specifically, the cylinder member 30 and the hydraulic adjustment member 60 are separated and configured, thereby providing a cylinder member ( 30) When the piston 50 operates within the hydraulic fluid uniformly does not cause a load, the hydraulic oil passing through the cylinder outer wall is not discharged through a separate hydraulic oil discharge hole, but rather a hemispherical protrusion of the upper end of the cylinder member (30) There is no risk of clogging of the hydraulic oil discharge hole due to flow in all directions through the 31, and it is a separate hydraulic auto door closer that can reduce the manufacturing cost by easily assembling, processing parts and replacing parts, and a compression spring instead of the conventional torsion spring. It is strong in fatigue strength, easy to adjust the tension of the compression spring, reduce unnecessary assembly process and parts processing And at the same time, compression in the parts replacement can be easily and reduce manufacturing costs relates to a spring-loaded automatic door closure.

In general, the entrance door of the building is provided with a swinging door, the door is opened suddenly by an unexpected external force in the open state is always inherent in the risk of safety accidents. In order to prevent such a safety accident, it was common to install a two-section link type damper on the top of a revolving door, but the installation process is increased by installing it separately from the door, and the door damper is easily removed from the door by external force. Departures can also cause malfunctions. Recently, hydraulic door closers and spring door closers (published by Korean Patent Nos. 1998-82068 and 2000-72276) have been introduced to have a damper function in the door hinge part to improve such a problem. 1 is an exploded perspective view of a conventional hydraulic door closer, and as shown in the drawing, the configuration includes a cylinder member 180 provided with a door pivot member 150, a door support member 160, and a hydraulic oil discharge hole 184. It can be seen that the spiral groove 173 is formed of a shaft 170 and a piston 190 that linearly moves within the cylinder 189. However, such a conventional hydraulic door closer is simply installed between the door and the door frame to have its own effect of buffering the external force acting on the open door, but has some problems as follows.

First, since the cylinder member 180 is integrally formed including the hydraulic adjusting screw 186 and the hydraulic fixing stopper, and the pressure oil discharge hole 184 and the spiral groove 181 are formed at one end thereof, the door is opened. When the piston 190 is operated, there is a possibility that a piece load is generated, and since the hydraulic oil discharge hole 184 having a relatively small diameter must be formed in the cylinder member 180, it is not easy to process and the hydraulic oil discharge hole A blockage of 184 may be easily generated, which may make it impossible to operate the door closer itself.

Second, when assembling the door closer, when the piston 190 is inserted into the cylinder member 180 by forcibly inserting the rubber O-ring (not shown in the figure) of the upper end of the piston 190, the wear of the parts are severe and the assembly and replacement of parts It is difficult, and third, when trying to adjust the hydraulic pressure by using the upper hydraulic adjustment screw 186, because the separate safety device is not provided, the hydraulic adjustment screw is separated from the spiral groove 181 of the cylinder member 180 As a result, a situation in which the oil is leaked may be produced.

Fourth, a separate guide pin 195 for guiding linear movement along the guide groove 197 of the guide member 196 should be formed in the lower end of the piston 190, the wear of the member in the guide groove 197 As a separate U-shaped steel member is to be forcedly inserted for prevention, an increase in a machining process and a rise in machining cost due to the manufacture of these components are inevitable, and the guide pin 195 is formed in the guide groove 197. Since there is a linear movement due to the point-contact between the magnetic steel member and has a problem that the unstable linear movement.

On the other hand, Figure 2 is an exploded perspective view of a conventional spring-type door closer, the configuration of the door pivot member 111 is provided with a door pivot member 110, the door support member 120 is provided with a door bracket 121b is fixed to the door frame , The shaft 130 for connecting the door support member 120, one side end is coupled to the door pivot member 110, the opposite end is coupled to the torsion spring 140 to be fixed integrally with the door support member 120. It can be seen that consists of. However, these conventional spring door closers also have some problems as follows.

First, as is well known, the conventional spring is designed with a unique concept of elastic recovery movement due to tension or compression force, and the spring used in the conventional spring type door closer receives a torsion when the door is opened. Some of the tension (tension force) in the center, the other is a compression force (compression force) acts to be relatively vulnerable to fatigue strength, second, the torsion spring 140 is the outer peripheral surface of the shaft 130 In order to secure the fitting, the fixing ends 142 and 143 which are bent in the longitudinal direction at both ends are required, and fixing holes drilled in the slit 132 and the door pivot member 110 of the shaft corresponding thereto ( The configuration of 113 is inevitable, and third, a pin hole 137 penetrated in a direction orthogonal to the spiral groove 136 is formed on the circumferential surface of the adjusting nut 135 for adjusting the elastic force of the torsion spring 140. Home (12 It is configured to adjust the elastic force by the pin 127 inserted through 6) to disassemble the pin 127 when adjusting the elasticity of the torsion spring 140 has to be reassembled in another pin fixing groove 126 Due to the formation angle or number of the fins and the pinned groove, there is a problem in that the elastic force of the torsion spring 140 cannot be finely adjusted.

The present invention has been made to solve the above-mentioned conventional drawbacks, the object of the present invention is to fundamentally solve the occurrence of piece load and clogging of the hydraulic oil discharge hole during the operation of the piston, and does not reveal the possibility of leakage of the hydraulic oil Provides a safety device to prevent damage to the parts and reduces the wear of parts, and is a separable hydraulic automatic door closer that is easy to assemble and replace each part and resistant to fatigue strength, simple assembly and production process of parts and fine spring elasticity To provide an adjustable adjustable spring auto door closer.

1 is an exploded perspective view of a conventional hydraulic door closer

2 is an exploded perspective view of a conventional spring type door closer

3 is an exploded perspective view of a separate hydraulic auto door closer constituting the present invention;

Figure 4 is a cross-sectional view of the operating state of the removable hydraulic automatic door closer constituting the present invention when the door is opened.

Figure 5 is a cross-sectional view of the operating state of the separate hydraulic automatic door closer constituting the present invention when the door is closed.

6 is an exploded perspective view of a compression spring type automatic door closer constituting the present invention;

Figure 7 is a cross-sectional view of the operating state of the compression spring type automatic door closer constituting the present invention when the door is opened.

Figure 8 is a cross-sectional view of the operating state of the compression spring type automatic door closer constituting the present invention when the door is closed.

Explanation of symbols on the main parts of the drawings

10, 120, 160: door support member 11, 111b: door frame bracket

12: outer housing 13, 63: cap

14: fixed screw 15: bearing

16: protrusion 17, 27: flat washer

18: cap installation unit 20, 110, 150: door rotation member

21, 121b: door bracket 22: outer housing

23a, 23b: thread 24: fixed end

25: O-ring coupling groove 26, 53, 67: O-ring

30, 180: cylinder member 31: hemispherical protrusion

33 head 34 hollow part

40: lead screw 41: snap ring

42: female thread 43: head

44: multi-threaded spiral 50, 80, 190: piston

51 check valve 52 steel ball

54 piston guide 55 washer

56 head portion 57 extension portion

58: body 59: incision groove

60: hydraulic adjustment member 61: hydraulic adjustment screw

62: washer 64: housing

65 stepped 66 bearing insertion hole

70: compression spring 81: fixed step

90: compression spring elastic force control member 91: protrusion

92: wrench groove 113: fixing hole

127: pin 130, 170: shaft

132: slit 135: adjusting nut

136, 173 Spiral groove 137 Pinhole

140: torsion spring 142, 143: fixed end

181: spiral groove 184: pressure oil discharge

189 cylinder 195 guide pin

196: guide member 197: guide groove

Features of the present invention for achieving the object as described above, first, in the case of a separable hydraulic auto door closer, the door support member 11 is fixed to the door frame (not shown) formed in the outer housing 12 ( 10); A door pivot member 20 having a door bracket 21 fixedly coupled to the door on an outer circumference of the outer housing 22; A cylinder member 30 configured to form a predetermined gap with an inner circumferential surface of the outer housing 22 and at the same time a pressurized oil is filled therein; A piston (50) having a check valve (51) therein and linearly moving inside the cylinder member (30) as the door pivot member (20) rotates; In the hydraulic auto door closer which is fixedly installed in the outer housing 12 of the door support member 10 and consists of a piston lead screw 40 spirally coupled to the piston 50, the lead screw 40 is multi-lined. Consists of a spiral, a plurality of hemispherical protrusions 31 are formed on the outer circumference of the cylinder member 30 head 33 for smooth flow of the hydraulic oil, and the hollow to be coupled to the hydraulic adjustment screw 61 in the center of the head 33 At the same time as the portion 34 is formed, a separate hydraulic adjustment member 60 having a screw thread is installed at one end of the cylinder member 30 to be helically coupled to the outer housing 22, the cylinder member 30 and It is to provide a separate hydraulic auto door closer, characterized in that the hydraulic adjustment member 60 is configured to be separated.

And, in another feature of the present invention, the hydraulic adjustment member 60 and the housing (64); The lower end portion is tapered in the lower direction and is inserted into the upper end of the cylinder member 30, and configured to have a predetermined gap with the hydraulic adjustment member 60 so that the pressure oil can flow out of the cylinder member 30. A hydraulic adjustment screw 61 configured to be screwed to 64; The inner diameter is composed of a washer 62 smaller than the outer diameter of the head of the hydraulic adjustment screw 61 is configured to prevent the hydraulic adjustment screw 61 from being separated from the housing during the hydraulic adjustment.

In addition, the head portion 43 of the lead screw 40 formed as a polygon as another feature of the present invention is fastened to the bearing 15 and the fixing screw 14 is characterized in that it is placed in the lower piston guide 54 The check valve 51 inherent in the piston 50 is characterized by a separable hydraulic auto door closer composed of only a body 58, steel balls 52, and a washer 55.

On the other hand, in the case of a compression spring type automatic door closer, the door support member 10 is formed in the outer housing 12, the door frame bracket 11 is fixedly coupled to the door frame (not shown); A door pivot member 20 having a door bracket 21 fixedly coupled to the door on an outer circumference of the outer housing 22; A piston 80 having a fixed stepped portion 81 at an upper end thereof and linearly moving as the door pivot member 20 rotates; The outer circumferential surface of the upper end is screwed into the interior of the door pivot member 20, the piston guide 54 for guiding the linear movement of the piston 80 in the state in which the extension portion 57 of the piston 80 is inserted into the inner circumferential surface Wow; A piston lead screw 40 fixedly installed at an outer housing 12 of the door support member 10 and configured to have a multi-helical shape spirally coupled to the piston 80; A compression spring (70) fitted on the protrusion (91) protruding downward from the fixed end portion (81) of the piston (80) and the compression spring elastic force adjusting member (90); It is to provide a compression spring type automatic door closer characterized in that the compression spring elastic force adjusting member 90 is screwed to the outer housing 22 of the door pivot member 20 and the lower portion has a protrusion 91 formed downward. .

Still another object of the present invention is to provide a wrench groove 92 at the upper end of the compression spring elastic force adjusting member 90 to finely adjust the tension of the compression spring 70 by the wrench groove.

Still another object of the present invention is a compression spring type automatic door closer characterized in that the head 43 of the lead screw 40 is fastened to the bearing 15 and the fixing screw 14 to be placed at the bottom of the piston guide 54. Is in the provision of.

The separate type hydraulic auto closer and the compression spring auto closer according to the present invention having such a configuration will be described in detail with reference to the drawings.

3 is an exploded perspective view of a separate hydraulic auto closer constituting the present invention. As shown in the drawing, the separable hydraulic auto closer has a door support member 10 fixedly coupled to a door frame (not shown), a door pivot member 20 fixedly coupled to the door, and the door support member 10. A lower end portion is fixedly coupled to the outer housing 12 of the lead screw 40 having a multi-threaded spiral portion 44 formed thereon, a cylinder member 30 filled with pressure oil in the lower portion, and an inner side in the cylinder member 30. The piston 50 coupled to the multi-threaded spiral portion 44 of the lead screw 40 in the inserted state in parallel to the rotary motion and linear motion, and the piston guide 54 for guiding the linear motion of the piston 50. It is composed of a), the upper cylinder member 30 is made of a separate hydraulic adjustment member 60 that is screwed into the interior of the door rotation member 20, the outer housing 22.

The door support member 10 has a door frame bracket 11 fixedly coupled to the door frame integrally formed on the outer circumferential surface of the outer housing 12, and has a polygonal lead screw 40 formed inside the outer housing 12. Protruding portion 16 having a shape corresponding to the shape of the head portion 43 is formed so that the head portion 43 is fixed and positioned, and a flat washer at the lower end portion of the protrusion portion 16 to prevent loosening of the fixing screw 14. 17, the bearing 15 is inserted between the flat washer 27 and the head 43 of the lead screw 40 to secure the lead screw 40 together with the fixing screw (14). It is configured to be screwed, the lower end of the outer housing 12, the cap installation portion 18 to which the cap 13 is coupled is protruded.

The door pivot member 20 is integrally provided with a door bracket 21 which is fixedly coupled to the door on the outer circumferential surface of the outer housing 22, and threads 23a and 23b on one side upper end and the lower end of the inner circumferential surface of the outer housing 22, respectively. The hydraulic adjustment member 60 and the piston guide 54 are fixedly coupled to each thread in the state where the thread is provided, and the cap 63 is fixed to the upper end.

The cylinder member 30 is provided with a hollow portion 34 at the upper end head 33 while the outer circumferential surface of the cylinder member 30 is inserted to form some gap with the inner circumferential surface of the door pivot member 20. The tapered lower portion is coupled to the hollow portion 34 so that a predetermined gap is maintained, and a plurality of hemispherical protrusions 31 are formed at the outer circumference of the upper end of the head 33 so that the end thereof is lower than the hydraulic adjustment member 60 to be described later. It is configured to abut. At this time, the plurality of hemispherical protrusions 31 is preferably installed three at intervals of 120 °, the number is not limited. On the other hand, as shown in the enlarged cross-sectional view of the cylinder member 30 of Figure 3, the step is formed on the inner peripheral edge of the upper end of the cylinder member (30). Due to this, the inner diameter of the cylinder member 30 has three different inner diameters in the vertical direction, and the inner diameter Φ 1 of the lower end of the cylinder member 30 centering on the stepped portion is larger than the inner diameter Φ 2 of the stepped portion. It is formed smaller than the inner diameter (Φ 3) of the upper end of the cylinder member 30 centered on the stepped portion, so that the size of Φ 2 <Φ 1 <Φ 3.

The lead screw 40 has a multi-threaded spiral 44 formed on the upper outer circumferential surface over a predetermined length to be inserted into the piston 50 to be described later, and the female screw 42 into which the fixed screw 14 is inserted. The head 43 having a polygonal shape is fixed in contact with the inner circumference of the piston guide (54). In addition, a flat washer 27 is provided at the center of the lead screw 40 to support the lead screw 40 at the lower jaw portion of the piston guide 54. -The ring 26 and the snap ring 41 for fixing the position of the bearing 15 under congratulation are installed.

The piston 50 has a circular head portion 56 having a circular cross section inserted into the cylinder of the cylinder member 30, extends downward from the head portion 56, and is inserted into the piston guide 54. A multi-threaded female screw portion is formed for the extension portion 57 having a hexagonal cross section and coupled to the lead screw 40 to a predetermined portion of the extension portion. The upper end of the piston 50 is provided with a check valve 51 which is separately processed and inserted, the configuration is for preventing the separation of the steel ball 52 and the steel ball 52 and the flow of pressure oil when the check valve is opened. An oval groove 51a is formed at the center of the washer 55, and the check valve 51 is opened and closed in accordance with the linear movement of the lead screw 40 to control the flow of pressure oil. On the other hand, the outer circumferential surface is circular, while the inner circumferential end surface is a hexagonal piston guide 54, the outer circumferential surface of its upper end is screwed into the inside of the door pivot member 20, the inner circumferential surface of the extension portion 57 of the piston 50 Will guide the linear movement of the piston 50 in the inserted state. In addition, a plurality of cutting grooves 59 are formed at the upper end of the piston guide 54 so that the hydraulic oil circulated through the gap between the inner circumferential surface of the door pivot member 20 and the outer circumferential surface of the cylinder member 30 can be smoothly passed through. At the lower end of the piston guide 54, a bearing insertion hole 66 coupled to the head 43 of the lead screw 40 protrudes to rotate integrally with the door pivot member 20. Accordingly, the piston guide 54 transmits a rotational movement to the piston 50 while rotating integrally with the door pivot member 20, and the piston 50 is a multi-threaded portion 44 of the lead screw 40. By the rotational motion and the linear motion will be parallel.

The hydraulic adjustment member 60 has a screw thread formed so as to be screwed with the hydraulic adjustment screw 61 in the center of the housing 64, and the lower end is also configured to be screwed with the outer housing 22 of the door pivot member 20. The lower end surface of the housing 64 of the hydraulic adjustment member 60 is configured to contact the hemispherical protrusion 31 of the cylinder member, and the housing 64 of the hemispherical protrusion 31 and the hydraulic adjustment member 60. The pressure oil flowing out through the gap between the inclined groove of the cylinder member 30 head 33 and the hydraulic adjustment screw 61 is made to flow through the gap formed therebetween. Therefore, after assembling, the hydraulic pressure of the hydraulic oil can be adjusted by fine adjustment of the hydraulic adjustment screw 61 to be described later, and at the same time, the manufacturing advantages can be adjusted in advance by adjusting the size of the hemispherical protrusion. On the other hand, at the center of the upper end of the hydraulic adjustment member 60, a stepped 65 for placing the washer 62 is formed, wherein the inner diameter of the washer 62 is the dozen or one-shaped groove Since the hydraulic adjustment screw 61 is rotated from the housing 64 of the hydraulic adjustment member 60 when the hydraulic adjustment screw 61 is rotated to adjust the hydraulic pressure of the hydraulic fluid by forming the head smaller than the outer diameter of the internal hydraulic adjustment screw 61. At the same time, a safety device that prevents the oil from leaking out of the system may be performed. In addition, the O-ring 67 is fitted to the lower end of the hydraulic adjustment screw 61 to prevent the hydraulic oil from leaking to the outside.

6 is an exploded perspective view of a compression spring type auto closer constituting the present invention. As shown in the figure, the compression spring type auto closer has a door support member 10 fixedly coupled to the door frame, a door pivot member 20 fixedly coupled to the door, and an outer housing of the door support member 10. The lower end portion is fixedly coupled to (12) and is coupled to the lead screw 40 having a multi-threaded spiral portion 44 formed on the top, and the multi-threaded spiral portion 44 of the lead screw 40 to perform a rotational motion and a linear motion in parallel A piston 80, a piston guide 54 for guiding the linear movement of the piston 80, and a separate compression spring elastic force adjusting member screwed to the inside of the outer housing 22 of the door pivot member 20 at the upper portion. 90, but the door support member 10, the door pivot member 20, the lead screw 40 and the piston guide 54 are the same as those of the separable hydraulic auto door closer, and thus description thereof will be omitted. Shall be.

One end of the coiled compression spring 70 is fitted in the form wound around the fixed end portion 81 of the piston 80 to be described later, the other end of the protrusion 91 of the compression spring elastic force adjusting member 90 also described later A configuration fitted to the

Piston 80 is composed of a fixed step portion 81 for the settlement of the compression spring 70 and the extension portion 57 is inserted into the piston guide 54 and the lead screw to a predetermined portion inside the extension portion A multi-threaded female thread portion for engaging with 40 is formed.

The outer circumferential surface of the compression spring elastic force adjusting member 90 is formed with a screw portion 94 is helically coupled into the outer housing 22, the lower end portion is formed with a protrusion 91 for coupling with the compression spring (70).

Hereinafter, with reference to the accompanying drawings, the functions and actions of the separable hydraulic auto door closer and the spring auto door closer according to the embodiment of the present invention having the above-described configuration will be described in detail.

4 and 7 are cross-sectional views of an operating state of a separate hydraulic auto door closer and a compression spring type auto door closer constituting the present invention when the door is opened, and FIGS. 5 and 8 are separate hydraulic types constituting the present invention when the door is closed, respectively. This is a cross-sectional view of the auto door closer and the compression spring type auto door closer.

When the person opens the door installed by the hinge of the door having the damper function, the rotational force of the compression spring type door closer is rotated integrally with the door and the rotation force is accumulated in the compression spring 70 fitted in the door pivot member 20. In the open state of the door, the door in the open state is closed by the elastic recovery force of the compression spring 70. At this time, the mechanism itself in which the hydraulic door closer controls the closing speed of the door is conventional. Is the same as the configuration of the door closer. However, when the door of the building is closed during the process as described above, the door pivot member 20 of the compression spring type door closer is rotated by a predetermined angle, the outer housing of the door pivot member 20 based on the rotational force Compression spring 70 installed in the (22) is to accumulate the elastic force in the compressed state as the piston 80 as shown in FIG. At this time, in order to increase or decrease the elastic force of the compression spring 70, the wrench is inserted into the wrench groove 92 formed on the upper end of the compression spring elastic force adjusting member 90, and the compression spring elastic force adjusting member 90 is rotated at an appropriate angle. By making the elastic force of the compression spring 70 can be finely increased or decreased. This is compared to the one side fixed end 143 of the torsion spring 140, the conventional spring-type closure is inserted into the fixing hole 113 is rotated at a predetermined angle in the winding direction to accumulate the elastic force 113 or shaft 130 It is possible to use the components of the separable hydraulic auto door closer as it is, without additional components that are difficult to process, and to use the compression elastic force of the unique concept of the spring instead of torsion, so that the durability of the product is excellent due to its excellent fatigue strength. It can be improved. In addition, when the elastic force of the spring is adjusted, the torsion spring 140 with the pin 127 in a state where the pin hole 137 of the adjustment nut 135 and the pin fixing groove 126 of the door support member 120 are in communication with each other. Conventional structure for increasing and decreasing the elastic force accumulated in the) is adjustable only by a predetermined angle (60 °, according to Figure 2), the compression spring type automatic door closer of the present application freely fine depending on the degree of rotation of the screw To that extent it is possible to adjust the elastic force of the compression spring (70).

On the other hand, when the compression spring 70 is operated as described above, as shown in Figure 4, when the door pivot member 20 of the separate type hydraulic auto door closer is rotated integrally with the door, the door pivot member 20 Piston guide 54 coupled to the thread 23b of the () is rotated together with the door pivot member 20, the piston 50 is integrally coupled with the piston guide 54 is also to be rotated at a predetermined angle. . In addition, the piston 50 is inserted into the multi-threaded spiral portion 44 of the lead screw 40 by the female screw portion of the inner circumference, the lead screw 40 is a protrusion 16 of the door support member 10 Since the head 43 of the lead screw 40 is firmly fixed to the), the piston 50 is transferred from the upper portion to the lower portion of the cylinder member 30 in parallel with the rotational movement and linear movement. Accordingly, the steel ball 52 of the check valve is raised to the upper portion of the piston 50 and positioned in the center of the elliptical groove 51a perforated in the washer 55, so that the pressure oil in the cylinder member 30 is increased in the elliptical groove 51a. Since the pressure inside the cylinder member 30 is released, the door is opened smoothly without receiving any resistance due to the oil pressure of the separate hydraulic door closer.

Subsequently, in the open state of the door, the compression spring type auto door closer is automatically closed by the elastic recovery force of the compression spring 70 itself without the action of an external force. The state of the closure is as shown in FIG.

On the other hand, the door rotation member 20 of the separate hydraulic automatic door closer of the present application corresponding to the piston guide 54 and the piston 50 to rotate integrally while integrally rotating with the door as described above, the piston ( 50) and also parallel to the rotational movement and linear movement in the cylinder member 30, and is transferred from the lower portion of the cylinder member 30 to the top, the state diagram is as shown in FIG. At this time, the steel ball 52 in the check valve 51 of the piston 50 is placed in the lower end of the body 58 of the check valve 51 and eventually the check valve 51 is kept closed. Accordingly, the hydraulic oil stayed in the upper portion of the cylinder member 30 is a four-way gap formed between the three hemispherical protrusions 31 formed at the upper end of the cylinder member 30 and the lower end of the housing 64 of the hydraulic adjustment member 60. Since it flows through, no load is generated, and the hydraulic oil flowing in the path as described above is then cylinder member 30 through a narrow gap between the outer housing 22 of the door pivot member 20 and the cylinder member 30. Since it is circulated to the lower part, the door is slowly closed by the pressure of the hydraulic oil. On the other hand, since the inner diameter of the cylinder member 30 is made of three different inner diameters (Φ 2 <Φ 1 <Φ 3) as described above, the door is up to a predetermined angle (that is, the piston 50 is raised to stepped portions) Until the piston 50 reaches the stepped portion, and becomes the minimum speed at the moment when the piston 50 reaches the stepped portion, the speed is faster than the door speed before reaching the stepped portion when the piston 50 passes the stepped portion itself. The door will close correctly.

In addition, the hydraulic pressure control of the hydraulic oil in the separate hydraulic automatic door closer tightens the hydraulic adjustment screw 61 in the top or bottom of the hydraulic adjustment member 60 in the top of the hydraulic adjustment member 60 with a conventional driver. Or to control the closing speed of the door by adjusting the amount of pressure oil circulated through the hollow portion 34, the inner diameter of the hydraulic adjustment screw 61 to form a separate washer 62 larger than the outer diameter When the hydraulic adjustment screw 61 is released during adjustment, the hydraulic adjustment screw 61 is prevented from being separated from the hydraulic adjustment member 60 by the pressure oil.

In the figure, reference numeral 24 denotes a fixed end for preventing the separation of the O-ring, 25 denotes an O-ring insertion groove, and 53 denotes an O-ring.

As described above, according to the present invention, the cylinder member 30 and the hydraulic adjustment member 60 are configured to be separated, so that the hydraulic oil acts uniformly when the piston 50 is operated in the cylinder member 30, and a single load is generated. The hydraulic oil passing through the cylinder outer wall flows in all directions between the hemispherical protrusions 31 of the upper end of the cylinder member 30 so that the hydraulic oil is circulated smoothly without clogging. By using a separate hydraulic auto door closer and a compression spring that can be reduced, it is strong in fatigue strength, easy to adjust the tension of the compression spring, reduces unnecessary assembly process and parts processing, and at the same time, it is easy to replace parts and save manufacturing cost. By providing a compression spring type auto door closer, a more efficient auto door closer can be provided.

Claims (8)

A door support member 10 having a door frame bracket 11 fixedly coupled to the door frame on the outer housing 12; A door pivot member 20 having a door bracket 21 fixedly coupled to the door on an outer circumference of the outer housing 22; A cylinder member 30 configured to form a predetermined gap with an inner circumferential surface of the outer housing 22 and at the same time a pressurized oil is filled therein; A piston (50) having a check valve (51) therein and linearly moving inside the cylinder member (30) as the door pivot member (20) rotates; In the hydraulic auto door closer which is fixedly installed in the outer housing 12 of the door support member 10 and consists of a piston lead screw 40 spirally coupled to the piston 50, the lead screw 40 is multi-lined. Consists of a spiral, a plurality of hemispherical protrusions 31 are formed on the outer circumference of the cylinder member 30 head 33 for smooth flow of the hydraulic oil, and the hollow to be coupled to the hydraulic adjustment screw 61 in the center of the head 33 At the same time as the portion 34 is formed, a separate hydraulic adjustment member 60 having a screw thread is installed at one end of the cylinder member 30 to be helically coupled to the outer housing 22, the cylinder member 30 and Separate hydraulic hydraulic door closer, characterized in that the hydraulic adjustment member 60 is configured to be separated from each other. 2. The separate type hydraulic auto door closer of claim 1, wherein the inner diameter of the cylinder member is made of three different inner diameters. According to claim 1, wherein the hydraulic pressure adjusting member (60) and the housing (64); The lower end is inclined and inserted into the upper end of the cylinder member 30, the hydraulic oil is configured to have a predetermined gap with the hydraulic adjustment member 60 so that the oil can flow out of the cylinder member 30, the upper end is screwed to the housing 64 A hydraulic adjustment screw 61 configured to be coupled; Separate hydraulic hydraulic door, characterized in that the inner diameter is composed of a washer 62 smaller than the outer diameter of the head of the hydraulic adjustment screw 61 is configured to prevent the hydraulic adjustment screw 61 is separated from the housing during the hydraulic adjustment. Closure. 2. The detachable hydraulic auto door according to claim 1, wherein the head 43 formed in the polygonal shape of the lead screw 40 is fastened to the bottom of the piston guide 54 by being fastened by the bearing 15 and the fixing screw 14. Closure. 2. The separate type hydraulic auto door closer of claim 1, wherein the check valve (51) embedded in the piston (50) is composed of only a body (58), steel balls (52), and a washer (55). A door support member 10 having a door frame bracket 11 fixedly coupled to the door frame on the outer housing 12; A door pivot member 20 having a door bracket 21 fixedly coupled to the door on an outer circumference of the outer housing 22; A piston 80 having a fixed stepped portion 81 at an upper end thereof and linearly moving as the door pivot member 20 rotates; The outer circumferential surface of the upper end is screwed into the inside of the door pivot member 20, the inner circumferential surface of the piston guide 54 for guiding the linear movement of the piston 80 with the extension portion 57 of the piston 80 is inserted; ; A piston lead screw 40 fixedly installed at an outer housing 12 of the door support member 10, spirally coupled to the piston 80, and configured in a multi-threaded shape; A compression spring (70) fitted on the protrusion (91) protruding downward from the fixed end portion (81) of the piston (80) and the compression spring elastic force adjusting member (90); Compression spring type automatic door closer, characterized in that the compression spring elastic force adjusting member 90 is screwed to the outer housing 22 of the door pivot member 20, the lower end is formed with a protrusion 91. According to claim 6, Compression spring elastic force adjusting member 90 is formed in the upper end of the wrench groove 92 is formed by the wrench inserted into the wrench groove 92 can finely adjust the tension of the compression spring (70) Compression spring auto door closer, characterized in that it is configured. The compression spring-type auto according to claim 6, wherein the head portion 43 formed in the polygonal shape of the lead screw 40 is fastened to the lower end of the piston guide 54 by being fastened by the bearing 15 and the fixing screw 14. Door closer.