KR20210043170A - Door closer - Google Patents

Abstract

The present invention relates to a door closer placed between a door and a door frame to turn the door installed in a hinge structure inward around a hinge shaft, thereby promoting the closing of the door. According to the present invention, the door closer includes: a casing part having a cylinder chamber; a piston placed in a forward and backward movement structure in the cylinder chamber; a rotary shaft placed in a rotary structure in the casing part, and geared with the piston through rack and pinion gears to be rotated normally and reversely by the forward and backward movement of the piston such that an assembled link arm can be turned inward and outward; and a closing spring elastically pressing the piston from one side to the other side. As the cylinder chamber is divided into left and right sides by the piston placed in a forward and backward movement structure, on one side of the cylinder chamber, the closing spring is placed, and an intake decompression part having an intake hole communicating with the outside is formed, and, on the other side of the cylinder chamber, a compression pressurization part for damping an advancement speed of the piston advanced in the other direction of the cylinder chamber by an elastic force of the closing spring through compressed air pressure by compressing residual air by the piston advanced in the other direction, is formed. Thus, the piston advanced in the other direction by the elastic force of the closing spring is formed to damp the speed of advancement to the other side by a compression pressure force generated in the compression pressurization part and an intake decompression force generated in the intake decompression part.

Description

Door closer

The present invention relates to a door closer, and more particularly, to a door closer that attempts to close a door by rotating a door disposed between a door and a door frame and installed in a hinge structure inwardly around a hinge axis.

As is well known, a door closer is usually installed on the door to close the door in a fire door such as a fire door or a front door of a house, apartment, officetel, etc., and conventionally, a housing and a link shaft penetrating approximately the center of the housing ( A pinion gear coupled to the gear shaft), a spring disposed inside the housing, and a rack gear meshing with the pinion gear are provided to press the spring when the door is opened to accumulate elastic energy for closing the door. It is equipped with a spring pusher.

The housing of the door closer is attached to the door, one end of the link is fastened to the link shaft, and the other end of the link is fastened to the door frame.

And as an example, in order to configure the housing compactly, a conventionally applied and registered technology of patent application No. 10-2012-0139177 has been developed, which includes: a housing fixed to a door; One end is a link (link) connected to the frame (frame) of the door; A link shaft that is rotatably fitted to the housing and has its upper end protruding to the outside of the housing connected to the other end of the link; A pinion gear rotating coaxially with the link shaft; It is inserted into the housing so as to be reciprocated in the longitudinal direction of the housing, a rack gear portion engaged with the pinion gear at one end, a piston base portion at the other end, and the rack gear portion and the piston A piston having a piston body connecting the base; And a coil spring fitted into the piston body and compressed when the link shaft rotates in a direction in which the door is opened to accumulate elastic energy, and a spring through hole into which the coil spring is inserted, As a passage through which the rack gear unit reciprocates, the rack gear through holes are formed to be connected in a line with each other, a damping oil filled in the spring through hole, and a sealing unit that prevents the damping oil from leaking into the rack gear through hole It has a structure further comprising a (sealing unit).

If such damping oil is adopted, it is difficult to ensure stable operation stability due to leakage of damping oil, and if external heating occurs due to fire or the like, explosion and ignition due to vaporization of the filled damping oil are caused, causing safety problems. do.

Of course, a structure that replaces the oil-type damping structure with pneumatic pressure has also been developed, and by using an air cylinder with a damping hole for gradually releasing the air pressure, the air in the air cylinder is compressed with a piston when the door is closed. It is a structure in which the amount of air discharged through the damping hole is reduced compared to the amount of compressed air so that it is damped in response to the closing force of the door.

However, conventionally, when air pressure is formed in the air cylinder, it is continuously discharged through the damping hole.Therefore, the amount of change in the air pressure in the air cylinder is small. There is this.

In addition, if the door is stopped while the door is closed, the air in the air cylinder is continuously discharged through the damping hole.When the door is closed again after stopping the closing door, the closing speed of the door is reduced in the cylinder until the air pressure in the air cylinder is formed. It has the limitation that it cannot be reduced by air pressure.

KR 10-1050509 B1 KR 10-0265254 B1 KR 10-2019588 B1

An object of the present invention conceived to solve the above problems is to convert the elastic reaction force of the closing spring into rotational force through the rack and pinion, and close the door through the rotational force, so that the closing force speed of the compressed closing spring is It is to provide a door closer that allows the door to close smoothly by configuring it to be controlled through pneumatic pressure.

The above object is achieved by the following configuration provided in the present invention.

The door closer according to the present invention,

A casing portion in which a cylinder chamber is formed; A piston disposed in an advancing and retreating structure in the cylinder chamber; A rotation shaft disposed in the casing portion in a rotational structure, engaged by the piston, the rack and the pinion gear, and rotated in a forward and reverse direction by the advance and retreat of the piston, so that the assembled link arm rotates inward and outward; And a closing spring for elastically applying the piston from one side to the other side,

The cylinder chamber is partitioned left and right by a piston arranged in a forward and backward structure,

One side of the cylinder chamber is provided with a closing spring, and an intake depressurization unit having an intake hole communicating with the outside is formed, and the other side of the cylinder chamber is applied to a piston advancing in the other direction of the cylinder chamber by the elastic force of the closing spring. By compressing the residual air by forming a compression pressurizing part that attenuates the advancing speed of the piston advancing in the other direction through the compressed air pressure,

The piston advancing in the other direction by the elastic force of the closing spring is configured to reduce the advancing speed of advancing to the other side by the compression press force generated in the compression pressurization unit and the intake air pressure decompression force generated in the intake depressurization unit. .

Preferably, a sealing ring that forms a sealing structure with the inner wall of the intake air depressurization portion is disposed at one end of the piston that is externally in contact with the inner wall of the intake air decompression portion of the cylinder chamber.

More preferably, in the intake hole formed in the intake pressure reducing part, an intake control valve is disposed in which the opening amount is adjusted according to the tightening amount of the adjusting bolt, and the intake pressure reducing force in the intake pressure reducing part according to the opening amount of the intake hole through the intake control valve It is configured to be adjusted.

In addition, the compression pressurization unit is formed by filling compressed air of a set pressure, and the other end of the piston in contact with the inner wall of the compression pressurization unit forms an inner wall and a sealing structure of the compression pressurization unit, and the compression is filled in the compression pressurization unit. A sealing ring is arranged to prevent air leakage.

In addition, a damping member that is filled with compressed air of a set pressure in the compression pressurization unit and moves forward and backward by the pneumatic pressure of the compressed air filled in the compression pressurization unit is further disposed, so that the piston is in the compression pressurization unit through the damping member. Compressed air at the filled set pressure is indirectly pressurized and compressed, and the advancing speed advancing to the other side is controlled.

In addition, when the pressure of the compressed air remaining in the compression pressurization unit is formed to be lower than the set pressure, the auxiliary air supply tank communicates through a pressure valve, and the compressed air filled in the auxiliary air supply tank is filled in the compression pressurization unit. Is configured so that compressed air of the set pressure is always filled.

In addition, the piston is supported in a rolling friction state through the support roller, and is stably supported by the support roller in the process of advancing and retreating along the cylinder chamber, so that flow generation is suppressed.

As described above, in the door closer according to the present invention, when the piston engaged with the rotation shaft moves from one side to the other by the elastic force provided through the closing spring, the door is closed, forming a compression pressing force and an intake air pressure reducing force. By providing the pneumatic damping structure, the piston is controlled at the required advance speed through the pneumatic damping structure.

That is, the present invention does not simply depend only on the compression pressure of air according to the advance of the piston, but structurally further provides an intake air pressure, thereby implementing the reduction braking of the piston through pneumatic pressure.

In this way, when the piston performs the damping function, that is, the damping function of the piston through the pneumatic pressure, the general problems caused by the adoption of damping oil, which is a factor of conventional leakage or heat explosion, and ignition, are solved, and excellent repetitive reproducing performance and Stable piston deceleration control is possible.

In addition, if a friction braking unit is additionally added, a more stable deceleration braking of the piston can be achieved by the organic action of the pneumatic damping structure and the friction damping structure, and the auxiliary closing force can be provided through the built-in auxiliary pressing unit. Through this, it is possible to form a completely closed state of the door.

In addition, since the auxiliary force portion is formed by grafting between the piston and the case portion, the structure becomes complicated and the volume becomes enlarged according to the separate exterior.

1 shows a construction state of a door closer proposed as a preferred embodiment in the present invention,
Figure 2 shows the overall configuration of the door closer proposed as a preferred embodiment in the present invention,
3 and 4 are operational state diagrams sequentially showing the advance state of the piston by the elastic force applied by the closing spring in the door closer proposed as a preferred embodiment in the present invention,
5 is an operational state diagram sequentially showing the advance state of the piston by the elastic force applied by the closing spring in the door closer proposed as another embodiment in the present invention,
6 is an enlarged view showing the operating states of the'A' portion and the'B' portion in FIG. 4,
7 is a view showing a detailed configuration and operation state of a friction damping unit in a door closer proposed as another embodiment in the present invention,
8 is a view showing a detailed configuration and operation state of the auxiliary pressing unit in the door closer proposed as another embodiment in the present invention.

Hereinafter, a door closer proposed as a preferred embodiment in the present invention will be described in detail with reference to the accompanying drawings.

1 shows the construction state of a door closer proposed as a preferred embodiment in the present invention, FIG. 2 shows the overall configuration of the door closer proposed as a preferred embodiment in the present invention, and FIGS. 3 and 4 In the door closer proposed as a preferred embodiment in the present invention, an operational state diagram sequentially showing the advance state of the piston by an elastic force by a closing spring, and FIG. 5 is a door proposed as another embodiment in the present invention. In the closure, it is an operational state diagram sequentially showing the advance state of the piston by the elastic force applied by the closing spring, and FIG. 6 is an enlarged view of the operational state of the'A' portion and the'B' portion in FIG. 4, and FIG. 7 shows the detailed configuration and operation state of the friction damping part in the door closer proposed as another embodiment in the present invention. It shows the detailed composition and working state of the force part.

The door closer (1) proposed as a preferred embodiment in the present invention is a link structure through a link arm (LA) between the door (D) and the door frame (F) forming the entrance of the building as shown in FIG. The device is disposed to provide a closing force for turning inward to the door D through the link arm LA so that the door D enters and closes the door frame F.

The door closer 1 includes a casing portion 110 having a cylinder chamber 110a formed thereon, as shown in FIGS. 2 to 4; A piston 120 disposed in an advancing and retreating structure in the cylinder chamber 110a; Arranged in a rotational structure in the casing part 110, the piston 120, the rack and the pinion gear are engaged to rotate in the forward and reverse direction by the advance and retreat of the piston 120, and the assembled link arm (LA) is rotated inward and outward. A rotation shaft 130 to be able to be; And a closing spring 140 for elastically pressing the piston 120 from one side to the other side.

Preferably, the piston 120 is supported in a rolling friction state through the support roller 113, and is stably supported by the support roller 113 in the process of advancing and retreating along the cylinder chamber 110a to suppress the occurrence of flow. do.

Therefore, in the door closer 1 according to the present embodiment, when the piston 120 advances from one side to the other by the elastic force of the compressed closing spring 140, the rotation shaft 130 engaged with the piston 120 is While rotating in one direction, the door (D) is automatically closed by turning the link arm (LA) assembled on the rotating shaft (130) inward, and the closing action of the door (D) through the elastic force of the closing spring (140) is It is almost the same as the conventional one.

However, in this embodiment, an improved pneumatic damping structure is provided in the door closer 1 to reduce the advancing speed of the piston 120 advancing from one direction to the other by the closing spring 140 through pneumatic pressure. Thus, by adjusting the advancing speed of the piston 120 during the closing wedge process of the door, the closing speed of the door D can be adjusted.

In particular, the pneumatic damping structure according to the present invention organically combines the compression action of the air and the decompression action of the air according to the advance of the piston 120, thereby reducing the advance speed of the piston 120, the casing unit 110 While minimizing the volume including the length of ), the stable deceleration of the piston 120 is implemented.

To this end, in this embodiment, the cylinder chamber 110a formed in the case portion 110 is divided left and right through a piston 120 arranged in an advance and retreat structure, so that the left side of the cylinder chamber 110a is a closing spring 140 ) Is formed in the intake pressure reducing portion 112, the other side of the cylinder chamber (110a) is by the piston 120 advancing to the other side of the cylinder chamber (110a) by the elastic force of the closing spring (140). By compressing the residual air, a compression pressurizing unit 111 is formed to reduce the advancing speed of the piston 120 advancing to the other side through the compressed air pressure.

In this embodiment, one end 121 of the piston 120 circumscribes the inner wall of the intake decompression unit 112 and the other end 122 of the piston 120 circumscribes the inner wall of the compression and pressurization unit 111 Each of the sealing rings 123 is disposed, so that both ends of the piston 120 are formed on one side of the cylinder chamber 110a by the sealing ring 123, and an intake decompression unit 112 formed on one side and a compression pressurization unit formed on the other side. (111) to form a seal within.

In addition, by forming one or more intake holes 112a in communication with the outside in the intake decompression unit 112, the piston ( When 120) advances from one direction to the other and a decompression state is formed in the intake decompression unit 112, external air gradually flows into the intake decompression unit 112 through the intake hole 112a to generate an intake decompression force. At the same time, the remaining air is compressed by the advancing piston in the compression pressurizing unit 111 to generate a compression pressurizing force.

Therefore, when the piston 120 advances from one side to the other side by an elastic force due to elastic restoration of the compressed closing spring 140, the piston 120 is a compression pressurization unit as shown in FIGS. 4 and 6 Due to the organic action of the compression pressing force formed in (111) and the intake air pressure reducing force formed in the intake decompression unit, the advancing speed of advancing from one direction to the other is reduced, and as a result, the door does not close rapidly, but closes at a low speed.

More preferably, as shown in FIG. 6B, an intake control valve 112b whose opening amount is adjusted according to the fastening amount of the control bolts 112b-a is disposed in the intake hole 112a formed in the intake pressure reducing part 112.

Therefore, the manager controls the opening amount of the intake hole 112a through the intake control valve 112b, through which the external air flowing into the intake depressurization unit 112 in which a depressurized state is formed through the intake hole 112a. By adjusting the inflow speed, it is possible to adjust the advancing speed of the piston 120.

In addition, in this embodiment, the compressed air of the set pressure is filled in the compression and pressurization unit 111, and the piston 120 that advances into the compression and pressurization unit 111 when the door D is closed is compressed air of the set pressure. While compressing, the moving speed by the elastic force provided through the closing spring 140 is reduced more stably.

In a preferred embodiment of the present invention, the compressed air of the set pressure is filled in the compression and pressurization unit 111, and the piston 120 advancing into the compression and pressurization unit 111 is compressed by the elastic force of the closing spring 140. While directly compressing the compressed air remaining in the pressurizing unit 111, it is decelerated from one side to the other to advance.

That is, in this embodiment, while the piston 120 disposed in the compression pressurization unit 111 directly compresses the compressed air PA of the set pressure filled in the compression pressurization unit 111, it is directed to the other side by the compression force of the compressed air. Let's advance.

In another embodiment, as shown in FIG. 5, a damping member 150 is provided that fills the compressed air of the set pressure in the compression and pressurization unit 111, and advances and retreats by the air pressure of the compressed air filled in the compression and pressurization unit 111. Further arranged, the piston 120 advancing into the compression pressurizing part 110 by the elastic force of the closing spring 140 is supported by the damping member 150 so that the advancing speed advancing from one side to the other side is reduced It is configured to be.

That is, in this embodiment, the piston 120 advancing in the other direction does not directly compress the compressed air, but the piston 120 indirectly presses and compresses the compressed air through the damping member 150, It aims to reduce the advancing speed that advances in the other direction.

More preferably, the compression pressurization unit 111 communicates with the auxiliary air supply tank 151 filled with compressed air having a relatively higher air pressure than the compressed air pressure remaining in the compression pressurization unit 111 through the pressure valve 152 Arrange it.

Therefore, when the pressure of the compressed air remaining in the compression and pressurization unit 11 is formed to be lower than the set pressure, the auxiliary air supply tank 151 communicates through the pressure valve 152 and the compressed air filled in the auxiliary air supply tank 151 Is filled in the compression pressurization unit 111, so that compressed air of the set pressure is always filled in the compression pressurization unit 111.

Thus, when the door (D) is closed, the piston 120 advancing into the compression pressurization unit 11 forms a compression pressurization force and a decompression state according to the compression of the compressed air of the set pressure filled in the compression pressurization unit 111. Due to the intake decompression force according to the inlet speed of the external air flowing into the intake decompression unit 112, it does not rapidly advance from one direction to the other, but slowly advances by decelerating, and as a result, the door (D) is at a constant speed. It turns inward and closes.

In addition, in this embodiment, by further providing a friction damping unit 160 that assists the air damping structure, the advancing speed of the piston 120 is more stable due to the organic action of the air damping structure and the friction damping unit 160. To be very controllable.

The friction damping unit 160 is disposed in a rotating structure through a hinge pin on the casing unit 10 as shown in Figs. 2, 4, and 7, and the action end 161b is on the outer wall of the piston 120. A frictional brake lever 161; A braking spring that pressurizes the pressing end 161c of the braking lever 161 so that the braking lever 161 rotates around the hinge pin 161a to frictionally brake the outer wall of the piston 120 through the action end 161b Including 162.

Here, a friction pad layer 161b-a is formed at the working end 161b of the braking lever 161 to stably frictionally brake the piston 120 advancing in the other direction, and the rear end of the braking spring 162 Is supported by the adjustment bolt 163 so that the frictional braking force formed between the brake lever 161 and the piston 120 is adjusted according to the fastening amount of the adjustment bolt 163.

Accordingly, the piston 120 that closes the door while moving from one direction to the other by the elastic pressing force provided through the compressed closing spring 140 has an air damping structure that forms a compression pressing force and an intake air pressure reducing force, Due to the organic deceleration damping action of the friction damping structure including the braking spring 162 and the braking lever 161, the door does not rapidly move to the other side but gradually moves by the elastic force provided through the closing spring 140. (D) Make sure that it is closed gently and slowly.

On the other hand, in the present embodiment, by adding an auxiliary force to the door closer to assist the closing force section, the compressed closing spring is extended to weaken the elastic force, that is, the auxiliary closing force to the piston just before the door enters the door frame. By providing a further, the piston is completely moved to the other side by the auxiliary closing force to form a completely closed state of the door.

The auxiliary pressing unit 170, as shown in Figs. 2 to 4 and 8, the auxiliary pressing force formed to be concave in the outer wall of the piston 120 advancing and retreating along the cylinder chamber 110a formed in the case unit 110 A groove 171 and; The other side of the piston 120 is supported by being externally supported on the outer wall of the piston 120 advancing in the other direction along the cylinder chamber 110a, and then elastically entering the auxiliary pressing groove 171 in the auxiliary closing section where auxiliary pressing force is required. It includes an auxiliary pressing force tool 172 to push the auxiliary force in the direction.

Here, the auxiliary pressing groove 171 formed on the outer wall of the piston 120 is elastically supported by the auxiliary pressing tool 172 and the inclined surface structure to enter the inclined structure, so that the auxiliary pressing force provided through the auxiliary pressing tool 172 By this, the piston is configured to advance in the other direction.

In addition, the auxiliary pressing tool 172 includes a pressing lever (172a) disposed externally to the outer wall of the piston (120); It includes a force spring (172b) for elastically applying the force lever (172a), a support roller (172a-a) is provided at the working end of the force lever (172a), the force lever (172a) is a support roller ( 172a-a) through rolling friction with the outer wall of the piston 140.

The pressing lever (172a) is installed in a vertical hinge structure through a hinge pin on the mover supported at the tip of the pressing spring (172b), as shown in Figure 8, the pressing lever (172a) is a piston (120) in one direction In the advanced and retracted state, it is horizontally aligned with the mover to support the outer wall of the piston 120, and when the piston 120 moves in the other direction and is positioned in the auxiliary closed section, it is bent downward and enters into the auxiliary force groove 171 and is inclined. By supporting the structure, the auxiliary force of the piston 120 advancing in the other direction by the elastic force provided through the force spring 172 is aimed at.

*** Reference numeral 173 on the drawing is a guide that guides the path of the force lever, and 174 is an adjustment bolt that adjusts the compression force of the force spring. ***

Accordingly, the present invention provides the auxiliary pressing force at the time when the elastic pressing force of the closing spring is weakened by the auxiliary pressing force, thereby achieving stable closing of the door.

1. Door closer
110. Casing part 110a. Cylinder chamber
111. Compression pressurization part
112. Intake decompression unit 112a. Intake hole
112b. Intake control valve 112b-a. Adjustment bolt
113. Support Roller
120. Piston 121. One end
122. Other end 123. Sealing ring
130. Rotating shaft
140. Closing spring 150. Damping member
151. Auxiliary air supply tank 152. Pressure valve
160. Auxiliary damping part 161. Brake lever
161a. Hinge pin 161b. Action stage
161b-a. Friction pad layer 161c. Pressurization end
162. Brake spring 163. Adjustment bolt
170. Auxiliary gripping unit 171. Auxiliary gripping groove
172. Auxiliary furniture 172a. Auxiliary clamping lever
172b. Auxiliary load spring

Claims (7)

A casing portion in which a cylinder chamber is formed; A piston disposed in an advancing and retreating structure in the cylinder chamber; A rotating shaft disposed in the casing part in a rotating structure, engaged with the piston, rotated in a forward and reverse direction by the advance and retreat of the piston, and rotate the assembled link arm inward and outward; And a closing spring for elastically applying the piston from one side to the other side,
The cylinder chamber is partitioned left and right by a piston arranged in a forward and backward structure,
One side of the cylinder chamber is provided with a closing spring, and an intake depressurization unit having an intake hole communicating with the outside is formed, and the other side of the cylinder chamber is applied to a piston advancing in the other direction of the cylinder chamber by the elastic force of the closing spring. By compressing the residual air by forming a compression pressurizing part that attenuates the advancing speed of the piston advancing in the other direction through the compressed air pressure,
The piston advancing in the other direction by the elastic force of the closing spring is configured to reduce the advancing speed to the other side by the compression press force generated in the compression pressurization unit and the intake air depressurization force generated in the intake depressurization unit. Door closer. The door closer according to claim 1, wherein a sealing ring is disposed at one end of the piston that is externally in contact with the inner wall of the intake depressurizing portion of the cylinder chamber and forms a sealing structure with the inner wall of the intake depressurizing portion. The intake control valve according to claim 1, wherein an intake control valve in which an opening amount is adjusted according to a fastening amount of the control bolt is disposed in the intake hole formed in the intake pressure reducing part, Door closer, characterized in that configured to adjust the pressure. The compression pressurizing unit according to claim 1, wherein the compression pressurizing unit is formed by filling compressed air of a set pressure, and the other end of the piston in contact with the inner wall of the pressurizing unit is formed with an inner wall of the pressurizing unit and a sealing structure A door closer, characterized in that a sealing ring is disposed to prevent leakage of compressed air filled therein. The method of claim 1, further comprising a damping member filled with compressed air of a set pressure in the compression pressing unit and advancing and retreating by the pneumatic pressure of the compressed air filled in the compression pressing unit, wherein the piston is moved through the damping member. A door closer, characterized in that, while compressing by indirectly pressurizing compressed air of a set pressure filled in the compression pressurizing unit, the advancing speed advancing in the other direction is controlled. The method of claim 4 or 5, wherein when the pressure of the compressed air remaining in the compression pressurization unit is formed to be lower than the set pressure, the auxiliary air supply tank communicates through a pressure valve to compress and pressurize the compressed air filled in the auxiliary air supply tank. Door closer, characterized in that configured to be filled in the portion, the compressed air of the set pressure is always filled in the compression pressurized portion. The door closer according to claim 1, wherein the piston is supported in a rolling friction state through a support roller, and is stably supported by the support roller in the process of advancing and retreating along the cylinder chamber to suppress the occurrence of flow.

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