KR100265254B1 - Door closer - Google Patents

Abstract

PURPOSE: A pneumatic door closer is provided to correctly operate without considering temperature, to prevent trouble according to immoderate operation and to reduce a cost. CONSTITUTION: A pneumatic door closer comprises a door(2) having a cylinder body(6); a cylinder(4) mounted in the cylinder body; pistons(42,44) sliding front and back in the cylinder; and a pressure spring(10) pressurizing the piston frontward. The piston composed of a rear piston pressurized through the pressure spring by forming a rack gear(8) on a side and a front piston elastically connected to the rear piston. A first buffer spring(52) is installed between the rear and front pistons to buffer. The pneumatic door closer uses air to control traveling speed of the pistons. Thereby, the pneumatic door closer actuates without considering temperature by the air not changing viscosity, and prevents oil leakage and environmental pollution.

Description

Pneumatic Door Closer

The present invention relates to a pneumatic door closer, and more particularly to a pneumatic door closer that can be used to close the open door at a constant speed using air.

Figure 1 shows the mounting portion of the door closer, Figure 2 shows a cross section of a conventional door closer.

Such a door closer is generally mounted on the upper side of the door 2 to automatically close the open door 2 at a constant speed. A cylinder body 6 having a cylinder 4 therein includes a door 2 ) Is mounted on the upper side. In addition, a rack gear 8 is formed at one side, and the piston 12 pressurized forward by the pressure spring 10 is slidably mounted inside and outside the cylinder 4. The piston 12 is hermetically mounted inside the cylinder 4 to partition the inside of the cylinder 4 into a front chamber 14 and a rear chamber 16.

Then, the pinion gear 20 meshed with the rack gear 8 is mounted in the insertion hole 18 formed in the cylinder body 6. The insertion hole 18 is formed in close proximity to the piston 12 so that one side crosses the piston 12, the communication portion 22 is formed to communicate with the piston 12 on one side thereof is the communication portion 22 The rack gear 8 and the pinion gear 20 are engaged with each other.

In addition, the pinion gear 20 is connected to the link mechanism 24 for rotating the pinion gear 20 in accordance with the opening and closing of the door (2). The link mechanism 24 has a pivotal arm 26 fixedly mounted to the rotary shaft 25 of the pinion gear 20, one end of which is connected to the pivotal arm 26, and the other end of which is mounted to the door 2. It is composed of a connecting arm 28 connected to the door frame 27.

In addition, the operating chamber is filled in the front chamber 14 and the rear chamber 16 of the cylinder 4, and the piston 12 is pressurized by the piston 12 when the piston 12 is reversed. A check valve 30 for discharging the operating oil of the chamber 16 to the front chamber 14 is provided. In addition, the cylinder body 6 has a flow path 32 for discharging the oil of the front chamber 14 pressurized when the piston 12 is advanced to the rear chamber 16, and the flow path 32 is formed in the flow path (32). 32 is provided with a control valve 34 for adjusting the flow rate of the operating oil discharged to the rear chamber (16).

Accordingly, when the door 2 is opened, the pinion gear 20 is rotated by the link mechanism. Accordingly, the piston 12 engaged with the pinion gear 20 is reversed to compress the pressure spring 10. The operation oil behind the piston 12 is discharged to the front of the piston 12 through the check valve 30. When the door 2 is released, the piston 12 is advanced by the compressed pressure spring 10 to rotate the pinion gear 20. At this time, the operating oil discharged to the front of the piston 12 was discharged to the rear of the piston 12 through the flow path (32).

Then, the flow rate of the operation oil discharged to the rear of the piston 12 through the flow path 32 to the control valve 34, and accordingly, by adjusting the speed at which the piston 12 is advanced, the door (2) You can adjust the speed at which) closes. As the pinion gear 20 rotates, the pivoting arm 26 is rotated to pull the connecting arm 28 so that the door 2 automatically closes, so that the door 2 does not have to be deliberately closed.

However, such a door closer has a problem in that the closing speed of the door changes according to the season since the viscosity of the working oil used as the working fluid changes with temperature. In particular, in the summer, the door could be closed quickly to injure the hands, etc., and in winter, the door was closed lately, causing problems with heating, as well as freezing the operating oil when the temperature was very low, causing the door closer to freeze. In addition, the oil may leak due to wear during use, and there is a problem in that the operation is poor as the oil leaks. In addition, since the flow path 32 through which the working fluid is discharged must be formed in the cylinder body 6, there is a problem in that the cost is increased. When the door 2 is closed, when the door 2 is pushed in the direction in which the door 2 is closed or an impact is applied to the door 2, the pinion gear 20 tries to rotate rapidly, but the control valve Since the speed at which the piston 12 moves forward by the 34 is limited, an excessive force is applied to each of the parts such as the link mechanism 24 and the control valve 34 to easily break down or leak oil.

The present invention is to solve the above problems, the object of the present invention is to operate exactly regardless of the temperature, to prevent the failure due to excessive operation, to provide a pneumatic door closer of a new structure that can reduce the cost It is for.

1 is a reference diagram showing the mounting position of the door closer

2 is a cross-sectional view of a conventional door closer

3 is a cross-sectional view of the pneumatic door closer according to the present invention

4 to 7 are cross-sectional views showing the operating state of the embodiment

<Description of the code | symbol about the principal part of drawing>

2. Door 4. Cylinder

6. Cylinder body 10. Pressurized spring

24. Crank mechanism 42. Front piston

44. Rear piston 58. Front air chamber

60. Rear air chamber 68. First control valve

70. Second control valve 72. Vent

According to the present invention, a cylinder body 6 mounted on the door 2 and provided with a cylinder 4 therein, and a rack gear 8 formed on one side thereof, and slides back and forth inside the cylinder 4. A piston 42 and 44 which are integrally formed so as to partition the inside of the cylinder 4 into the front air chamber 58 and the rear air chamber 60 and are pressed forward by the pressure spring 10, and one side of the cylinder A pinion gear 20 mounted to an insertion hole 18 formed in the cylinder body 6 so as to communicate with the rack body 8 and engaged with the rack gear 8 formed in the pistons 42 and 44; Rotating arm 26 fixedly mounted to rotating shaft 25 of 20 and one end thereof is connected to this rotating arm 26 and the other end of the connecting arm 28 connected to door frame 27 on which door 2 is mounted. It is composed of a link mechanism 24 for rotating the pinion gear 20 in accordance with the opening and closing of the door (2), and is mounted on the front end side of the cylinder body (6) Control valves 68 and 70 through which air in the front air chamber 58 flows in and out as the pistons 42 and 44 move forward and backward, and are formed at the rear end side of the cylinder body 6 and the pistons 42 and 44. And a through hole through which the air in the rear air chamber 60 is suctioned and discharged according to the forward and backward movement of the), and the flow rate of the air discharged from the front air chamber 58 by adjusting the control valves 68 and 70. By adjusting the, a pneumatic door closer is provided, characterized in that it is possible to adjust the speed at which the door 2 is closed.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

Figure 3 shows a pneumatic door closer according to the present invention, the cylinder 4 is provided inside the cylinder body 6 mounted to the door 2, the inside of the cylinder 4, the piston 42, 44 is slidably mounted back and forth. The pistons 42 and 44 are pushed forward by the pressure springs 10, and a rack gear 8 is formed at one side thereof, and a rear piston 44 pressurized by the pressure springs 10, and the rear It is composed of a front piston 42 disposed in front of the piston 44 and elastically connected to the rear piston 44.

The rear piston 44 has a slide hole 46 formed on the front thereof, and the slide hole 46 is slidably mounted with a connecting rod 50 having a head 44 formed at a rear end thereof. The front piston 42 is screwed to the front end of the). Then, a first buffer spring 52 is interposed between the rear piston 44 and the front piston 42 to cushion the space between the rear piston 44 and the front piston 42. In addition, a second buffer spring 54 is provided on the front sides of the pistons 42 and 44. The second buffer spring 54 supports the front ends of the pistons 42 and 44, thereby acting as a shock absorber with the first buffer spring 52.

The front piston 42 is made slightly smaller than the diameter of the cylinder 4 so that some air can pass between the outer peripheral surface and the inner wall of the cylinder, the piston ring 56 is mounted on the outer peripheral surface of the cylinder ( The inside of the cylinder 4 is partitioned into the front air chamber 58 and the rear air chamber 60 by the front piston 42. In addition, an air inlet groove 62 is formed on the outer circumferential surface of the front piston 42 so as to be located at the front side of the piston ring 56, and the air inlet groove is a connection groove formed on the outer circumferential surfaces of the pistons 42 and 44 ( 64 is in communication with the front air chamber 58, the air of the front air chamber 58 is introduced. In addition, an oilless bearing 66 is mounted on the inner circumferential surface of the cylinder 4 in contact with the pistons 42 and 44, and the inner circumferential surface of the cylinder 4 and the pistons 42 and 44 according to the slides of the pistons 42 and 44. To prevent wear on the outer circumferential surface.

In addition, the cylinder body 6 has an insertion hole 18 to which the pinion gear 20 engaged with the rack gear 8 formed in the rear piston 44 is mounted. The insertion hole 18 has a communication portion 22 communicating with the cylinder 4 on one side thereof, and the rack gear 8 and the pinion gear 20 are engaged through the communication portion 22. In addition, a tip end of the pivot arm 26 fixedly mounted to the rotation shaft 25 of the pinion gear 20 and a door frame 27 connected to the pivot arm 26 and to which the door 2 is mounted is mounted. Link mechanism 24 composed of a connecting arm 28 is provided to rotate the pinion gear 20 in accordance with opening and closing of the door 2. Therefore, like the conventional door closer, the door 2 can be closed automatically.

In addition, a first control valve 68 and a second control valve 70 are mounted on the front end side of the rear piston 44. The first regulating valve 68 and the second regulating valve 70 communicate with the front air chamber 58 so that the first and second regulating valves 68 and 70 move forward and backward. Through the outside air is sucked into the front air chamber 58, or the air of the front air chamber 58 is discharged to the outside. Therefore, by adjusting the flow rate of the air discharged from the front air chamber 58 by adjusting the first and second control valves 68 and 70, the speed at which the pistons 42 and 44 move forward can be adjusted accordingly. The speed at which the door 2 is closed can be adjusted.

In particular, the second control valve 70 is disposed in the middle of the stroke of the piston (42, 44) in which the piston (42, 44) is advanced. Therefore, if the front end of the front piston 42 blocks the second control valve 70 while the pistons 42 and 44 are moving forward, the side surfaces of the pistons 42 and 44 through the second control valve 70. Since only a small amount of air is supplied between the inner wall of the cylinder 4 and the discharge, the flow rate of the air discharged from the front air chamber 58 is further reduced.

In addition, a vent hole 72 is formed at the rear end side of the cylinder body 6 to supply air to the rear air chamber 60 as the pistons 42 and 44 move forward or backward, or to the rear air chamber 60. Exhale air to the outside.

4 to 6 illustrate an operating state of the pneumatic door closer. When the door 2 is opened, the pistons 42 and 44 are reversed by the link mechanism 24 as shown in FIG. 4. . At this time, outside air flows into the front air chamber 58 through the first and second control valves 68 and 70, and through the air vent 72 formed at the rear end of the cylinder body 6, the rear air. Air in the chamber 60 is discharged to the outside. Then, the pressure springs 10 for pressing the pistons 42 and 44 are compressed by the reversed pistons 42 and 44.

When the door 2 is released, the pistons 42 and 44 are advanced by the pressure spring 10 and the door 2 starts to close. At this time, the air of the front air chamber 58 is discharged to the outside through the first and second control valves 68 and 70, and the outside air is passed to the rear air chamber 60 through the vent hole 72. Inflow. Accordingly, the door 2 is closed by adjusting the flow rates of air discharged to the outside through the first and second control valves 68 and 70 by adjusting the first and second control valves 68 and 70. You can adjust the speed.

As shown in FIG. 5, when the front piston 42 moves forward and the front end blocks the second control valve 70, the small amount of air supplied between the pistons 42 and 44 and the inner wall of the cylinder 4 is reduced. Only positive air is discharged through the second control valve (70). Therefore, since the flow rate of the air discharged from the front air chamber 58 decreases, the speed at which the pistons 42 and 44 move forward and the speed at which the door 2 closes become slower.

And, as shown in Figure 6, when the front piston 42 is further advanced to block the first control valve 68 and the second control valve 70, the piston (42, 44) and the cylinder (4) Since only a small amount of air supplied between the inner walls is discharged through the first and second control valves 68 and 70, the speed at which the pistons 42 and 44 move forward and the door 2 are closed are further increased. It slows down, and therefore it can prevent that a hand etc. get caught between the door 2 and the door frame 27, and is injured.

When the pistons 42 and 44 are further advanced and the air inlet grooves 62 formed in the front piston 42 reach the first control valve 68, the front pistons Since the air of the front air chamber 58 supplied to the air inlet groove 62 through the connection groove 64 formed in the 42 is discharged through the first control valve 68, the discharge of air is increased and the piston ( The speed at which the 42 and 44 move forward and the door 2 are closed are increased.

In general, the ratchet bolt is inserted into the insertion hole 18 formed in the door 2 to protrude by the spring on the side of the door 2 so that the door 2 can be closed. In this case, a slight force should be applied to the door (2). Therefore, as described above, the door 2 can be closed by increasing the speed at which the door 2 is closed.

Therefore, when the door 2 is closed, as described above, the door 2 can be closed at a speed of about three stages, and the first and second control valves 68 and 70 are adjusted to control the door 2. You can freely adjust the closing speed. In addition, the air used in the door closer according to the present invention has a high compression ratio compared to the oil used in the conventional door closer, there is a problem that the air of the front air chamber 58 is compressed by the pressure spring, the pressure spring Since the pressure by is not very large, the compression of the air by the pressure spring in the general situation can be ignored.

If the user pushes the door 2 in the direction in which the door 2 is closed while the door 2 is closed, or an impact is applied to the door 2, the shock is transmitted to the pistons 42 and 44. As shown in FIG. 1, the front piston 42 is not rapidly advanced, and only the rear piston 44 is advanced, so that the first buffer spring 52 interposed between the rear piston 44 and the front piston 42. ) Is compressed.

Therefore, the gap between the rear piston 44 and the front piston 42 is reduced, thereby acting as a buffer. At this time, the second buffer spring 54 supports the front piston 42 to prevent the front piston 42 from moving forward. Therefore, the shock applied to the link mechanism 24 can be absorbed by the rear piston 44 moving forward, and since the forward speed of the front piston 42 does not change significantly, the first and second regulating valves 68 The flow rate of the air discharged to 70 does not increase rapidly. Thus, the link mechanism 24 and the first and second control valves 68 and 70 can be prevented from being damaged.

As such, the configured pneumatic door closer uses air to adjust the speed at which the pistons 42 and 44 move forward, and thus can exclude the leakage of oil due to the use of oil, and the air may change or freeze depending on temperature. Because of this, it can always operate correctly regardless of temperature, and can prevent the environmental pollution by oil.

In addition, it is not necessary to form a passage through which oil passes in the cylinder body 6, and inexpensive air can be used instead of relatively expensive oil, thereby reducing the cost. In addition, when an impact is applied to the door 2, since the first buffer spring 52 interposed between the rear piston 44 and the front piston 42 absorbs the shock, breakage due to the impact may be prevented. .

As described above, according to the present invention, by using air as a fluid to control the forward speed of the piston (42, 44), it is operated accurately regardless of the temperature, can prevent failure due to excessive operation, and reduce the cost It is possible to provide a new structure of pneumatic door closer.

Claims (2)

The cylinder body (6) mounted on the upper door 2 and provided with a cylinder (4) therein, and a rack gear (8) is formed on one side and the cylinder (4) is built in the cylinder (4) so as to slide back and forth The inside of the (4) is divided into the front air chamber 58 and the rear air chamber 60, the pistons (42, 44) pushed forward by the pressure spring 10, and one side is in communication with the cylinder (4) A pinion gear 20 mounted to an insertion hole 18 formed in the cylinder body 6 so as to be engaged with the rack gear 8 formed on the pistons 42 and 44, and a rotation shaft of the pinion gear 20; The rotating arm 26 fixedly mounted at 25 and one end thereof are connected to the rotating arm 26 and the other end is composed of a connecting arm 28 connected to the door frame 27 on which the door 2 is mounted. 2) the link mechanism 24 for rotating the pinion gear 20 in accordance with the opening and closing of the cylinder, and the front side of the cylinder body 6, and the front of the pistons 42 and 44. Control valves 68 and 70 through which air in the front air chamber 58 flows in and out as the tank is formed, and are formed at the rear end side of the cylinder body 6, and the rear air is moved forward and backward of the pistons 42 and 44. It comprises a through hole through which the air in the chamber 60 is sucked and discharged, and by adjusting the control valves 68, 70 by adjusting the flow rate of the air discharged from the front air chamber 58, the door (2) Pneumatic door closer, characterized in that to adjust the closing speed. The rear piston (44) of claim 1, wherein the pistons (42, 44) are provided with rack gears (8) formed at one side thereof and pressed by the pressure springs (10) and slide holes (46) formed at the front thereof. The rear end has a head 44 formed so as to be slidably mounted in the slide hole 46, the front piston 42 which is coupled to the front end of the connecting rod 50, and the rear. A pneumatic door closer characterized in that it comprises a first buffer spring (52) interposed between the piston (44) and the front piston (42).