KR860003003Y1 - Door closer - Google Patents

Abstract

No content.

Description

Pneumatic door closer

Figure 1 is a partial longitudinal cross-sectional view showing the configuration and operation state of the door closer design of the present invention, Figure 1 (a) is a longitudinal cross-sectional view showing a state before the operation of the piston in the closed state the door is equipped, the first (b) is a longitudinal cross-sectional view of the state in which the piston is opened backward operation of the door is equipped with the present invention.

2 is an enlarged perspective view of a disk valve installed in the present invention.

3 is an installation state of the door closer design of the present invention.

* Explanation of symbols for main parts of the drawings

1: cylinder 2: pinion

3: spring 4: piston

4 ': rack 4a: groove

4b: distribution hole 5: front cap

5a: recess 5b: inlet hole

5c: adjusting hole 5d: exhaust hole

5 ': rear cap 5a': ventilator

6: Adjustment bolt 7, 7 ': Disc valve

7a: disc plate 7d: bullet point

The present invention relates to a pneumatic door closer that allows the door to be closed using compressed air, and instantaneous opening / closing operation of a disk plate valve installed at each front hole of the cylinder body and the front cap of the piston body. The present invention relates to a pneumatic door closer which allows for easy and smooth opening and closing of a door by appropriately maintaining air pressure in the piston.

Hydraulic door closers generally used generally contain a certain amount of oil inside the cylinder to prevent the door from closing due to the hydraulic action of the oil circulating in the cylinder in accordance with the forward movement of the piston piling up with the spring. It is supposed to. However, this type of hydraulic door closer requires a certain amount of oil to properly maintain the hydraulic pressure therein, which causes a cost increase, while the oil contained in the cylinder reacts sensitively to the atmosphere depending on the temperature difference. As a result, the viscosity of the oil was changed, and the opening and closing speed of the door was changed according to the change of season. In addition, since a predetermined sealing material must be inserted in the connecting bearing portion of the pinion and the arm that drives the piston, it is necessary to precisely process to maintain an accurate sealing for inserting such a sealing material. As the sealing part is easily worn by repeated rotation of the bearing part, the closed end of oil filled inside flows out of the cylinder, and when the door is opened, that is, when the piston is retracted, the oil introduced into the piston is piston. As the outflow circulation circulates to the front of the cylinder through the small outflow hole in the front, the door is opened heavily when the door is opened, and the outflow hole in which the ball valve is inserted is easily blocked by foreign substances, causing the case of opening and closing failure. Got. In addition, if the door is not opened at a certain angle when the door is opened, that is, the hydraulic pressure inside the cylinder is not changed when the door is opened in a small width, and the door is not completely closed. There was a point.

On the other hand, in view of the defects and problems of the conventional hydraulic door closer, a door closer employing a pneumatic cylinder is known by the Korean Utility Model Publication No. 81-1620 (name: automatic door closing device), such a The door closer connects the connecting piece formed on the front cap of the cylinder with a pin to the hanging piece fixed to the door, and the spring piece is fixed to the hanging piece between the supports fixed to the door holder, and the outer end of the piston rod inserted into the cylinder Is connected to the connecting piece of the spring barrel and both ends of the coil spring wound on the outer circumferential surface of the piston rod are in contact with the piston and the rear cap fixed to the tip of the piston rod, respectively, while opening and closing the exhaust hole formed in the front cap of the cylinder It has a structure in which the adjusting tool is screwed in.

When the door locker is opened, the piston in the cylinder is moved backwards to contract the coil spring and at the same time, the outside air flows through the exhaust hole formed in the front cap, and through the guide hole of the piston rod formed in the rear cap. As the internal air is discharged, the door is opened. When the door is closed, the air in the cylinder is discharged to the outside through the exhaust hole of the front cap and the outside air is introduced through the guide hole of the rear cap as the piston moves forward.

However, such a conventional pneumatic door closer always constantly introduces the pressure difference acting on the front space portion of the piston only through the exhaust hole formed in the front cap when the piston is moved backward or forward as the door is opened or closed. It is supposed to be eliminated by the outflowing air.

Therefore, when the door is closed by using the conventional door closer, the air filled in the front space of the piston is gradually discharged through the exhaust hole adjusted by the adjustment mechanism, so that the door is closed slowly, but the door is opened. Even if there is also a problem with the closed end that the outside air is gradually introduced through the exhaust hole is not able to open the door quickly and easily with a small force.

The present invention is devised to solve all the defects and problems of the conventional door closer, the front cap of the cylinder is formed in the exhaust hole to be opened and closed by the adjustment bolt and the front portion of the piston installed inside the cylinder A disk plate valve (hereinafter referred to as a disk valve) which is opened and closed by a predetermined air pressure is drilled on the inner surface of the front cap and the front part of the piston where the air inlet hole and the distribution hole having a predetermined diameter are drilled, respectively. On the other hand, on the one side of the cap covered in the rear of the cylinder body, a hole of another air through which a certain amount of air can be freely flown is drilled, and the inside of the cylinder flows in accordance with the forward and backward operation of the piston, which is driven by the pinion. When the door is opened by selectively opening / closing of each disc valve by air pressure The piston can be quickly reversed, and when the door is closed, the slow forward operation of the required piston can be made, which will be described in detail with reference to the accompanying drawings.

As shown in FIG. 1 (a) and FIG. 1 (b), the piston 4 which is elastically installed by the spring 3 to the pinion 2 provided in the middle part of the inner side of the cylinder 1 body. Rack 4 'is engaged, and both sides of the cylinder 1 have a front cap 5 and a vent 5a' having a vent hole 5a 'having a discharge hole 5d that is opened and closed by an adjustment bolt 6. In the pneumatic door closer (5 ') is provided, respectively, the recessed portion (5a) of a predetermined depth on the inner surface of the front cap (5) is drilled in the central portion of the inlet hole (5b) of a predetermined diameter In the front part of the piston 4, which is inserted into the body of the cylinder 1, a groove part 4a corresponding to the groove part 5a of the front cap 5 is formed, and in the center of the groove part 4a Inside of the piston 4b. The hole 4b of a predetermined diameter penetrated to the outside was drilled, but the aperture of the vent 4b was slightly larger than the aperture 5a 'of the rear cap 5'.

On the other hand, in the inner surface of the groove portion 5a of the front cap 5 and the inner surface of the groove portion 4a of the piston 4 as described above, a disk-shaped plate 7a having a predetermined size is formed on one side as shown in FIG. The other side is formed with a fixed piece (7c) perforated with a fixed hole (7b), and between the two plates (7a), (7c) formed of a carbon steel section (7d) of a constant width and length integrally formed The disc valves 7 and 7 'are fixed to each other with rivets 8 and 8', and the disk-shaped plates 7a of the disc valves 7 and 7 'are provided with the inlet hole 5b and Each of the distribution holes 4b was sealed.

In the figure, reference numeral 5c shows an adjustment ball which communicates with the discharge hole 5d so that the adjustment bolt 6 is fastened by screwing, and 9 and 9 'are airtight between the cylinder 1 and the piston 4. O-ring to maintain the will.

The operation and effects of the present invention door closer constructed as described above will be described in detail with reference to FIGS. 1A and 1B as follows.

FIG. 1 (a) shows the state in which the door to which the present invention is installed is closed, that is, before the door closer of the present invention is operated. In this case, the piston 4, which is piled up with the spring 3, is a cylinder (1). ), The front periphery of the piston 4 and the inner periphery of the front cap 5 are in close contact with each other, and the air pressure inside the cylinder 1 maintains the atmospheric pressure, and the piston 4 and the front The disc-shaped plates 7a of the disc valves 7 and 7 'provided in the cap 5 seal one side of the through holes 4b and 5b by the self-elasticity of these valves 7 and 7'. I keep doing it. In this state, when the door is opened, the pinion 2 of the cylinder 1 is driven to rapidly retreat the piston 4, and thus, the inside of the piston 4 and the cylinder by the rapid backward force of the piston 4 as described above. At the rear of (1), that is, the hollow portion (10 ') is instantaneously compressed to have an elevated air pressure in the hollow portion (10'), at the same time the cylinder (1) due to the backward of the piston (4) Another hollow portion (10) formed in the square of the instantaneously having a vacuum phenomenon, thus formed before the cylinder (1). As different air pressures are applied to the rear hollow portions 10 and 10 ', the compressed air in the rear hollow portion 10' causes the aeration holes 5a 'and the front surface of the rear cap 5'. It flows out through the distribution hole 4b, respectively.

However, at this time, since the diameter of the distribution hole 4b formed in the piston has a larger diameter than the vent hole 5'a of the cap 5 ', the air hole acting on the rear side of the distribution hole 4b is removed. As shown in Fig. 1 (b), the disk-shaped plate 7a of the disc valve 7 closing the front end of the flow hole 4b is pushed forward to open the valve 7 in a predetermined width. Accordingly, a portion of the compressed air inside the piston 4 and the rear hollow portion 10 'of the cylinder is introduced into the hollow portion 10 in front of the cylinder, and the rear hollow portion 10' of the cylinder 1 is also introduced. At the same time as the compressed air is discharged, the inlet hole 5b of the front cap 5 is closed by the suction force acting upon the instantaneous vacuum phenomenon formed in the hollow portion 10 in front of the cylinder 1. The disc-shaped plate 7 'of the disc valve 7 is bent inward from the tanning section 7d and then Since the negative air is sufficiently sucked in, the front of the cylinder (1). Atmospheric pressure, such as before the piston 4 is reversed, is momentarily applied to the rear hollow portions 10 and 10 '. Therefore, at the time of opening the door it is possible to achieve a quick and flexible opening without excessive force.

On the other hand, when the door opened as described above is stopped at a predetermined position and the back of the piston 4 is stopped and the air pressure of the double hollow portions 10 and 10 'inside the cylinder 1 is also reduced to atmospheric pressure, 4b, and since the inflow of air through the inlet hole 5b is stopped, the two holes 4b are formed by the elasticity of each of the disc valves 7, 7 'and the bullet point 7b. 5b is closed, and the forward movement of the piston 4 is started by the elasticity of the spring 3 applied to the piston 4 which has been reversed at the same time to compress the air introduced into the cylinder front hollow 10. Done. Therefore, the compressed air is gradually discharged to the outside of the cylinder through the one side discharge hole (5d) of the front cap (5), so that the smooth and smooth forward operation of the piston 4 is made to smooth and smooth closing of the open door You will be able to. The closing speed of such a door can be suitably adjusted by the adjustment bolt 6 of the adjustment hole 5c which communicates with the discharge hole 5d.

In addition, at this time, since any element that prevents the forward operation of the piston 4 does not work inside the cylinder 1 of the present invention, the door is minutely applied to the elasticity of the spring 3 for advancing the piston 4. It will be able to show a perfect closure even in the open state.

The pneumatic door closer according to the present invention as described above is the piston. In slow opening and closing the door by using the air pressure acting on the inside of the cylinder as the reverse operation, the inlet and the distribution hole which is opened and closed by the disc valve in front of the cylinder front cap and the piston are respectively formed, Piston's former at the time of reverse. The air pressure isolated from the rear hollow portion can be rapidly reduced to atmospheric pressure, and when the piston is advanced due to the closing of the door, the compressed air acting on the front of the piston is gradually discharged only through the discharge hole controlled by the adjustment bowl. Since it is possible to open the door quickly and effortlessly and effortlessly, there is an effect that a smooth and smooth slow opening and closing of the open door can be made.

Claims (1)

The pinion (2) adhered to the inner side of the cylinder (1) is engaged with the rack (4 ') of the piston (4), which is elastically installed by the spring (3), and the adjustment bolt (6) at both ends of the cylinder (1). In the door closer in which the front cap 5 having the discharge hole 5d which opens and closes, and the rear cap 5 'formed with the ventilation hole 5'a are respectively provided, the piston 4 with the distribution hole 4b is formed. The disk valves 7 and 7 'having the bullet holes 7d are fixedly installed in the inner recess 5a of the front cap 5 where the front recess 4a and the inlet hole 5b are formed. The disks 7a and 7 'of the disc-shaped plates 7a respectively allow the flow holes 4b and the inflow holes 5b to be closed, and vent holes formed in the rear caps 5'. A pneumatic door closer, characterized in that (5a ') is configured to have a slightly smaller aperture than the aperture of the distribution hole (4b).