KR100387211B1 - Door closer - Google Patents

Abstract

The present invention relates to a door closer, and more particularly, to reduce the wear of the rotating part by repeated opening and closing of the door to maintain a stable rotational force and precision, as well as to open the door with a small force ( The lower inner part of the 13 is provided with an insert 21 having a hexagonal hollow structure in the lower inner part of the housing 11 so as to be guided during the elevating, and the flow path R of the rotating rod 12 is formed. In order to implement a check valve 19 at the end of the c) and to implement efficient distribution of the hydraulic oil, a flow path R formed in the piston 13 at the opening and closing of the door is selectively selected to the flow path R in which the hydraulic regulator 16 is installed. It is configured to include a secondary hydraulic tank 15 is formed in communication with the insert 21 in the lower space of the insert 21 to communicate smoothly to the door by the hydraulic fluid is made.

Description

Door closer {Door closer}

The present invention relates to a door closer, and more particularly to a door closer to reduce the wear of the parts due to mechanical friction between the rotating parts when the door is opened and closed, while opening the door with a small force.

A door closer, generally referred to as a door check, is widely used for the purpose of automatically closing doors or fire doors of office buildings and residential buildings, and its general configuration is the same as that of FIG. 1 of Utility Model Registration No. 165486 (vertical door closer). . Referring to FIG. 1, a cylinder 1 coupled to a door or a door frame side receives a pintle 4 coupled to a door frame or a door side and rotating relative thereto, and a multi-threaded screw 4a formed at a lower portion thereof includes a piston 2. It is screwed into the screw groove of). The means for rotational restraint of the piston 2 has a polygonal cross section in which the outer surface of the piston 2 and the bore of the cylinder 1 in which the piston 2 is housed and lifted correspond to each other.

A rim portion 4b protrudes from the upper side of the pintle 4, and a coil spring 3 is provided between the lower portion of the rim portion 4b and the upper portion of the piston 2 to elastically move the piston 2 downward. It is biased (elastically pushed). Accordingly, when the door is opened, the pintle 4 coupled thereto rotates according to the rotation of the door, and the piston 2 coupled with the pintle 4 and the multi-threaded screw 4a is constrained to rotate against the bore of the cylinder 1. The coil spring 3 is elastically compressed while being raised in the closed state. Here, reference numerals 3a and 3b are both ends of the spring.

In the conventional door closer having such a configuration, since the thread grooves of the multi-threaded screw 4a and the piston 2 are directly engaged and rotated, the pintle 4 is shaken due to wear due to mutual friction, thereby shortening the life of the product. do. In addition, the conventional door closer because the impact and external forces are concentrated inside the cap portion of the upper portion due to the opening and closing of the door, the wear rate is very large, additional force is required when the rotation is applied due to the rotational load due to friction. In addition, in the configuration of the flow path, the fluid is difficult to be distributed efficiently, and a vacuum phenomenon occurs inside the piston reciprocating upward and downward, so that the opening and closing speed of the door is not constant, and more force is required, particularly when opening the door. There was a problem.

Therefore, the present invention was created to overcome the above-mentioned problems, and an object of the present invention is to reduce the wear of the rotating part due to the repetitive opening and closing of the door to maintain a stable rotational force and precision, as well as the door with a small force In providing a door closer that can open the.

1 is a cross-sectional view showing a door closer according to the prior art.

Figure 2 is a perspective view of the door closer of the present invention.

3 is a cross-sectional view of FIG.

4 is an exploded perspective view of FIG. 2;

<< Description of main part of drawing >>

11: housing 12: rotating rod

13: piston 14: ball screw

15: hydraulic auxiliary tank 16: hydraulic regulator

17: bush 18: housing cap

19: check valve 21: insert

22: shock absorber 23: thrust bearing

24: spring

An object of the present invention is a door closer in which the hydraulic pressure is controlled by the selective opening and closing of the flow path formed in the housing, the housing is built in the housing such that the rotary rod and the piston is elastically lifted, the lower portion of the piston To install the insert having a hexagonal hollow structure in the lower inner side of the housing so that the inner portion is guided during the elevating, to form a flow path of the rotating rod, but to install a check valve at the end of the flow path, to implement efficient distribution of hydraulic oil In order to open and close the door, the flow path formed in the piston is selectively communicated with the flow path in which the hydraulic control mechanism is installed, and the auxiliary hydraulic tank formed in communication with the insert in the lower space of the insert so that the smooth opening and closing of the door is made It can be achieved by the door closer.

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

Figure 2 is a perspective view showing a door closer of the present invention, Figures 3 and 4 are a cross-sectional view and an exploded perspective view of FIG. 2 to 4, the door closer of the present invention is a trust to hold the upper portion of the rotating rod 12 to distribute the torsional stress concentrated in the housing cap 18 according to the repetitive opening and closing of the door Built-in bearing 23 to couple the housing cap 18, the flow of the hydraulic flow is smoothly opening and closing the door through efficient distribution, as well as inside the lower end of the housing 11 to open the door with less force, in more detail Is formed by forming an auxiliary hydraulic tank 15 and the flow path (R) corresponding to the lower end of the piston (13).

Rotating rod 12 is mechanically coupled to the upper end of the door frame, the check valve 19 is formed in the hollow portion of the lower portion is formed with a flow path (R) corresponding thereto. Here, the flow path (R) is a passage of the hydraulic oil filled in the hydraulic auxiliary tank 15 to be described later through the open lower end, is formed to implement the opening of the door with a small force. The lower outer circumferential surface of the rotary rod 12 is formed with a screw thread so as to be engaged with the piston 13 to be described later as the door is opened and closed. Here, the thread of the rotating rod 12 is not clearly shown to show the hollow structure therein.

The piston 13 has a hollow structure in which the upper and lower ends are open to accommodate the above-described rotating rod 12, and as described above, a screw groove corresponding to the thread of the rotating rod 12 is formed in the lower inner wall. The drawings are not clearly shown. In addition, the lower portion of the piston 13 has a wide diameter of the inner wall so that the insert 21 of the hexagonal hollow structure can be inserted into a predetermined portion.

The rotating rod 12 and the piston 13 are accommodated in the housing 11 in an assembled state and are coupled by the housing cap 18. Here, as described above, the upper portion of the rotating rod 12 is exposed to the upper portion of the housing cap 18 to be mechanically coupled to the door frame. The inner wall of the housing 11 and the outer circumferential wall of the piston 13 are provided with a plurality of O-rings on the upper outer wall and the inner circumferential wall of the piston 13 for airtightness.

In addition, since the engaged rotary rod 12 and the piston 13 open and close the door, the inside of the housing cap 18 holding the upper portion of the rotary rod 12 may be concentrated and impacted seriously. Torsional stress is generated. In order to prevent this, the rotating rod 12 is held by incorporating the housing cap 18 by embedding the thrust bearing 23. That is, the thrust bearing 23 is located under the housing cap 18. This is caused by the occurrence of load during the opening and closing of the door, and the wear and tear of each part, while the impurities caused by the wear accumulated in the flow path (R) adversely affects the hydraulic flow is not desired, the additional force is required when opening the door and parts of It solves the problem of shortening the life.

The housing cap 18 has a brass bush 17 formed inside the housing cap 18 so as to prevent the wear of the inner wall due to mutual friction between the metal materials due to the rotation of the rotating rod 12 to reduce the life. Forced press The brass bush 17 is characterized by minimizing the mutual friction coefficient between the metal material to ensure durability between each component and to maintain the rotational force and precision of the stable rotating rod 12 for a long time.

The piston 13 is engaged with the rotary rod 12 and is moved up and down along the inner wall of the housing 11 in response to the rotation of the rotary rod 12. Here, the hexagonal insert 21 is press-fitted into the lower inner wall of the piston 13 to reduce the frictional force of the central axis of the rotational support portion, so that the lifting is smooth and the wear rate is minimized. In more detail, the reason why the insert 21 is provided on the inner lower portion of the housing 11 is that the piston 13 must be accurately guided along the inner wall of the housing 11 as the piston 13 moves up. Almost all the parts of 13) should be formed to be in close contact with the inner wall of the housing 11, and the increase in frictional force is well known. Therefore, in order to reduce the frictional force of the piston 13, after forming a lower portion of the piston 13 with a smaller outer diameter than the upper portion, the lower portion of the piston 13 is guided by the hexagonal insert 21 to form the piston as a whole. (13) is to allow the lifting and lowering accurately while reducing the frictional force with the inner wall of the housing (11).

In addition, a high tension square spring 24 is provided between the engaging step formed on the outer circumferential surface of the piston 13 and the inner bottom portion of the housing 11 for the stable lifting of the piston 13 engaged with the rotary rod 12 when the door is opened and closed. Is provided.

In addition, a ball screw 14 is provided on the engaged portion of the rotary rod 12 and the piston 13 so that the engaged groove portion of the piston 13 corresponds to the rotation of the rotary rod 12. The frictional force due to the tooth was minimized by being elevated while rotating along. In addition, a plurality of synthetic rubber O-rings are provided on the upper outer wall and inner circumferential wall of the piston 13 as described above in order to block the fluid to flow along the engagement groove to prevent the hydraulic pressure from being dispersed. It is.

In addition, the hydraulic oil is filled in the flow path R in order to stably implement the piston 13 as the piston 13 moves up and down in response to the opening and closing of the door. In addition, an auxiliary hydraulic tank 15 capable of storing and supplying hydraulic oil is formed at the lower end of the insert 21 provided inside the housing 11 so that the hydraulic pressure is not insufficient. Here, the upper side of the housing 11 is provided with a hydraulic adjustment port 16 by a screw adjustment method to the other portion in which the rotary rod 12 and the piston 13 is accommodated, so that the amount of hydraulic oil through the flow path R is increased. Proper adjustment facilitates the opening and closing of the entire door closer.

Referring to the flow of the hydraulic oil, the hydraulic oil filled in the housing 11 is via the check valve 19 provided inside the rotary rod 12 through the through hole (13a) formed in the lower portion of the piston (13) The fluid flows through the flow path formed inside the rotary rod 12, and then, in response to the lifting and lowering of the piston 13, the hydraulic regulator 16 is selectively communicated with the two flow paths provided therein, and then filled again in the housing 11. . In addition, the auxiliary hydraulic tank 15 provides surplus hydraulic oil to the check valve 19 of the rotary rod 12 through the insert 21 having a hexagonal hollow structure, thereby enabling the door to be opened and closed with less force. There is this. Here, the check valve 19 is provided for preventing the backflow of the hydraulic oil to facilitate opening and closing of the door by maintaining a constant opening and closing speed of the door by preventing the vacuum of the hydraulic pressure in accordance with the vertical reciprocating motion of the piston (13).

A separate buffer port 22 is provided at the bottom of the auxiliary hydraulic tank 15 so that proper hydraulic pressure always acts on the hydraulic auxiliary tank 15 so that the hydraulic pressure drops due to leakage of oil due to long time use. It is preventing. The buffer opening 22 is divided into an upper plate 22a provided with oil so as to be airtight with the inner wall of the housing 11, and a lower cap 22b screwed into the housing 11, with a spring 22c interposed therebetween. The hydraulic pressure acting on the auxiliary hydraulic tank 15 is maintained to correspond to the hydraulic pressure of the entire door closer by the elastic force of the spring 22c.

Here, the buffer port 22 may be lowered according to the pressure of the hydraulic oil of the upper plate 22a, and may be restored by the elastic force of the spring 22c, and desirable hydraulic pressure may be formed in the auxiliary hydraulic tank 15, which is a space. have.

As described above, the structure of the present invention has the following effects.

First, by distributing the torsional stress concentrated inside the housing cap to reduce the rotational load of the rotating rod, smooth opening and closing of the door can be achieved. Smooth flow can be achieved.

Second, by providing a brass bush in the direct contact portion between the housing cap and the rotating rod to minimize the mutual friction coefficient can maintain the durability between the components and stable rotational force and precision of the rotating rod.

Third, by providing an auxiliary hydraulic tank and a check valve to implement an efficient distribution of the hydraulic oil to prevent the vacuum state of the hydraulic pressure due to the movement of the piston up and down, the opening and closing speed of the door can be maintained and maintained smoothly opening and closing.

Fourth, since the piston has a structure in which a certain portion of the ball screw is recessed in the engagement groove when the piston ascends, it is possible to minimize the friction force between the rotating rod and the engaged piston, while providing an O-ring for the flow of hydraulic oil through the ball screw. By blocking leakage through it, the hydraulic pressure can be kept constant to realize the stable opening and closing speed of the door.

Fifth, by providing the insert so that only the upper side between the outer circumferential surface of the piston and the inner wall of the housing is in contact, the overall frictional force is minimized, and the lower part of the piston can be accurately guided by the insert even if the lower part of the piston is not in close contact with the outer circumferential wall. Can be.

Claims (5)

In the door closer in which the rotary rod and the piston is engaged to be embedded in the housing so that the piston is elastically elevated, the hydraulic pressure is controlled by the selective opening and closing of the flow path formed in the housing, An insert 21 having a hollow structure is installed inside the lower part of the housing 11 so that the lower inner part of the piston 13 is guided when the lower part is lifted, and a flow path R of the rotary rod 12 is formed. A check valve 19 is provided at an end of the flow path R, and a flow path R formed at the piston 13 when the door is opened and closed in order to implement an efficient distribution of the hydraulic oil flow path R in which the hydraulic regulator 16 is installed. And an auxiliary hydraulic tank (15) communicating with the insert (21) in the lower space of the insert (21) to selectively open and close the door by the hydraulic fluid. The method of claim 1, wherein the housing cap 18 of the housing cap 18 to disperse the torsional stress concentrated in the housing cap 18 according to the rotation of the rotary rod 12 and the lifting and lowering of the piston 13 when opening and closing the door And a thrust bearing (23) at the bottom to hold the outer circumferential surface of the rotating rod (12). 2. The rotary rod 12 is provided to hold the rotary rod 12 by forcibly pressing it into the housing cap 18 so as to reduce wear of the housing cap 18 in contact with the upper outer circumferential surface of the rotary rod 12. Door closer comprising a brass bush (17). The method of claim 1, wherein the ball screw 14 is provided in the engagement portion of the rotary rod 12 and the piston 13 to reduce the friction between the engaged rotary rod 12 and the piston 13, Door piston, characterized in that the piston (13) is raised and lowered as the meshed groove portion of the piston (13) rotates along the ball screw (14) corresponding to the rotation of the rotary rod (12). The door closer according to claim 1, wherein a buffer opening (22) is provided at an inner lower end of the housing (11) in which the auxiliary hydraulic tank (15) is formed to maintain proper hydraulic pressure of the auxiliary hydraulic tank (15). .