KR200326948Y1 - Door closer - Google Patents

Abstract

The present invention relates to a door closer, and by configuring the door closer in a simple structure that does not require an externally protruding link, it is easy to assemble, beautiful in appearance and at the same time improved durability and miniaturization.

The present invention is mounted on one side of the door and the outer case is formed with a space therein, and the case portion consisting of an inner case is inserted into the inner space of the outer case and sliding contact; A wheel fixed to a lower portion of the inner case and a gear formed on an outer circumferential surface thereof; A rail engaged with a gear formed in the wheel and having one end fixed to the ground and the other end guided by a guide mounted on one side of the door; A power transmission means composed of a gear coupled to the rotating shaft of the wheel to rotate, a pinion engaged with the gear to transmit a rotational force, and a rack engaged with the pinion; A damping returning means attached to an inner side of the inner case and including a cylinder in which a working fluid is received, and a piston interlocked with the rack and mounted on the inner side of the cylinder and elastically returned by a spring; And an elastic member inserted between the outer case and the inner case to bring the wheel into intimate contact with the ground.

Description

Door closer {Door closer}

The present invention relates to a door closer, and more particularly to a door closer that can be easily assembled, simple design and beautiful appearance and miniaturization possible.

In general, door closers are also called door checks and are widely used for the automatic closing of doors or fire doors in office and residential buildings.

A general configuration of such a door closer is a piston 201 elastically pushed to the closed side by a spring 202 in the main body 200 of the door closer, in which a working fluid is stored and made of oil, as shown in FIG. 1. ) Is received, and a rack 203 is installed at one side of the piston 201 and its shaft is engaged with the pinion 204 coupled with the link 205.

A flow path 207 having a check valve 206 is formed inside the piston 201, and a large return first return path 208 and a small diameter second return path between the operation path and the return path of the piston 201 ( 209 is formed.

The main body 200 and the link 205 are fixed to the door and the door frame, respectively, when the door is opened with respect to the door frame, the pinion 204 rotates and translates the rack 203 so that the piston 201 compresses the spring 202. It moves to the left side of the drawing.

After the external force applied to the door is removed, the piston 201 is returned to the right side of the drawing by the restoring force of the spring 202, where the piston 201 is provided when the tip of the piston 201 is in front of the first return passage 208. When the working fluid pushed back is returned through the first and second return passages 208 and 209, and the tip of the piston 201 passes through the first return passage 208, only the second return passage 209 of the small diameter is operated. The fluid is returned. Accordingly, the door is decelerated shortly before closing and gently closed to prevent the impact of the closing.

2 is a view illustrating the operation of a conventional door closer.

Door (D) is coupled to the hinge (H) on one side with respect to the door frame (F) in the form of a rectangular rim (rim) surrounding it to form a swing door.

On the other hand, the main body 200 of the door closer is attached to the door (D) and the end of the link 205 is coupled to the door frame (F), the link 205 is rotated in accordance with the opening of the door (D) door closer Will be activated.

The link 205 here comprises first and second arms 205a and 205b which are hinged to each other for the construction of a triangular link by two arms, in particular the second arm 205b for the adjustment of the opening and closing force. It is common for the adjusting arm 205c to be screwed on

Such a conventional door closer operates by transmitting the rotation of the link 205 to the horizontal movement inside the main body 200 installed horizontally, so that the main body 200 is large in length and the link 205 protrudes considerably large. This not only damages the appearance of the door (D), but also causes problems of indoor space utilization and safety accidents due to the protrusion of the link 205.

In addition, since the long link 205 is hinged and screwed together, the hinge is worn and the screw is loosened due to repeated opening and closing operations, thereby deforming and damaging the link 205 and loosening of the adjustment state. The service life of the door closer is shortened and the operation reliability is not guaranteed.

In addition, the conventional door closer has a problem in that it is not only aesthetically pleasing but also requires a cost and time when it is rebuilt because the connection part of the door or the door frame is often separated during long-term use.

In addition, the conventional door closer has a mechanical problem, and even though the opening of the door D is 90 degrees to 180 degrees, the rotation angle of the link 205, in particular, the rotation angle of the first arm 205a is 30 degrees to Since it is impossible to generate an effective torque by only 40 degrees, there is a problem in that the size of the door closer becomes large because the piston 201 and the large spring 202 having a long stroke cannot be used.

The technical problem to be achieved by the present invention is to provide a door closer that can be easily assembled, simple design, beautiful appearance and miniaturization by configuring the door closure in a simple structure that does not require a protruding link to the outside.

1 is a cross-sectional view of a door closer according to the prior art,

2 is an operation of the door closer according to the prior art,

3 is an exploded perspective view of a door closer according to an embodiment of the present invention,

4 is a cross-sectional view taken along the line A-A of FIG.

5 is a side view of a door closer according to another embodiment of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: Moon 11: Stopper

20: outer case 22: guide projection

23: pressing plate 30. Body

32. Guiding groove 33. Wheel

35. Pinion 36. Cam

37. Rack 41b. First return euro

41c. 2nd return flow passage 45. Check valve

The present invention to achieve the above object,

A case part comprising an outer case mounted on one side of the door and having a space formed therein, and an inner case inserted into the inner space of the outer case and slidingly contacted;

A wheel fixed to a lower portion of the inner case and a gear formed on an outer circumferential surface thereof;

A rail engaged with a gear formed in the wheel and having one end fixed to the ground and the other end guided by a guide mounted on one side of the door;

A power transmission means composed of a gear coupled to the rotating shaft of the wheel to rotate, a pinion engaged with the gear to transmit a rotational force, and a rack engaged with the pinion;

A damping returning means attached to an inner side of the inner case and including a cylinder in which a working fluid is received, and a piston interlocked with the rack and mounted on the inner side of the cylinder and elastically returned by a spring;

And an elastic member inserted between the outer case and the inner case to bring the wheel into intimate contact with the ground.

Here, the power transmission means may be further provided with one or more auxiliary gears between the gear and the pinion to obtain a desired rotation ratio.

In addition, the rail is installed to prevent slip of the ground and the wheel.

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

3 is an exploded perspective view of a door closer according to an embodiment of the present invention. Referring to the drawings, the door closer according to the present invention is composed of an outer case 20 mounted on the lower side of the door 10, the main body 30 is fitted to the outer case 20.

The outer case 20 is formed with a plurality of bolt holes 21 to be mounted to the door 10 by the bolt 25. In addition, the inner side of the outer case 20 is formed with a guide protrusion 22 is formed so that the main body 30 slides in the vertical direction is fitted into the guide groove 32 formed in the main body 30.

A spring 23 and a pressing plate 24 are installed on the inner upper end of the outer case 20 so that the main body 30 is elastically supported downward. Of course, instead of the spring 23 may be configured by inserting another elastic member.

The main body 30 is composed of an inner case 31 and a wheel 33 provided below the inner case 31.

On the other hand, the door stopper 11 is mounted on one side of the door 10 so that the door 10 stops at a specific position.

An internal configuration of the main body 30 will be described with reference to FIG. 4, which is a cross-sectional view along the A-A direction of FIG. 3.

Referring to the drawings, the main body 30 of the door closer according to the present invention is the inner case 31, the wheel 33 mounted on the lower side of the inner case 31, and transmits the rotational force of the wheel 33 And a damping return means mounted on one side of the inner case 31.

The power transmission means includes a gear 34 coupled with a rotation shaft of the wheel 33, a pinion 35 engaged with the gear 34 to transmit a rotational force, and a rack 37 engaged with the pinion 35. It consists of.

One or more auxiliary gears (not shown) may be added between the gear 34 and the pinion 35 to adjust the rotation direction or the rotation ratio.

The rack 37 has a slot (37a) is formed on the inside and the fixing pin 38 is inserted so that it can be supported during the vertical movement.

The damping return means is a cylinder (41) in which a working fluid is accommodated therein, a piston (43) formed integrally with the rack (37) and mounted inside the cylinder (41), and the piston (43) and One side is configured to include a spring 47 and a check valve 45 installed inside the piston 43.

A check valve 45 is mounted inside the piston 43 and a flow path is formed to allow a working fluid to pass therethrough.

An upper inlet 41a, a large diameter first return passage 41b and a small diameter second return passage 41c are formed in the operation path of the piston 43.

This slip prevention is an important problem because the door closer does not close completely when slip occurs between the wheel 33 and the ground.

In one method, it is possible to form a gear on the outer circumferential surface of the wheel 33, and to install a rail to be engaged with the gear on the ground to prevent slip.

A more preferred method is shown in Figure 5 which is a door closer according to another embodiment of the present invention.

The door closer is configured to include an outer case 20 mounted to the door 10 and a main body 30 fitted thereto.

The main body 30 is provided with a wheel 33 'having a gear formed on an outer circumferential surface thereof, one end of which is fixed to the ground 60 by a fixing means 53 at the lower side of the wheel 33', and the other end of the door 10 Rail 51 guided by the guide 52 mounted on one side of the) is installed.

The rail 51 has a gear formed such that one side is in contact with the ground 60 and the other side is engaged with the gear of the wheel 33 '.

Looking at the operation of the door closer according to an embodiment of the present invention having the configuration as described above.

First, the outer case 20 is fixed to the door, and then the main body 30 is inserted. The wheel 33 installed on the lower side of the main body 30 by the spring installed on the outer case 20 is in intimate contact with the ground.

When the door is opened, the wheel 33 rotates by friction with the ground, and the rotational force is transmitted to the pinion 35. The pinion 35 rotates and translates the rack 37 so that the piston 43 moves upward while compressing the spring 47.

When the external force applied to the door is removed, the piston 43 returns to the lower side by the restoring force of the spring 47. At this time, when the piston 43 is above the first return passage 41b, the working fluid pushed by the piston 43 is After the first and second return passages 41b and 41c are returned, and the piston 43 passes through the first return passage 41b, the working fluid is returned only to the second return passage 41c having a small diameter. As a result, the door is decelerated just before closing and closes smoothly.

On the other hand, when the door reaches the desired position, if the stopper 11 is brought into contact with the ground, the wheel 33 is not rotated by the friction force, the restoring force of the spring 47 is not applied.

At this time, when the stopper 11 is separated from the ground, the door is smoothly closed by the restoring force of the spring 47 and the damping action of the working fluid.

In the door closer according to another embodiment of the present invention, when the wheel 33 'is rotated, the rail 51 is guided into the guide 52 so that when the door 10 is opened (or closed), the rail 51 ) Is located inside the guide 52 so that it can pass without obstacles.

At this time, the door closer is preferably closer to the hinge side of the door because the length of the rail can be shortened.

As described above, the door closer according to the present invention is mounted on the lower side of the door and operated in a structure that does not require a link, so that the appearance is beautiful and the indoor space can be utilized, and at the same time, there is an effect of preventing a safety accident.

In addition, there is less deformation and damage of the door closer by repeated opening and closing operation, thereby improving durability and ensuring the reliability of the operation.

In addition, since the door closer is implemented in a simple structure, the door closer can be miniaturized.

In the detailed description of the present invention as described above, specific embodiments have been described, but various modifications are possible without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the embodiments described, but should be defined by the utility model registration claims as described below and equivalents to the utility model registration claims.

Claims (2)

A case part comprising an outer case 20 mounted on one side of the door and having a space formed therein, and an inner case 31 inserted into the inner space of the outer case and slidingly contacted; A wheel 33 fixed to the lower portion of the inner case and having a gear formed on an outer circumferential surface thereof; A rail 51 engaged with a gear formed in the wheel and having one end fixed to the ground and the other end guided by a guide mounted on one side of the door; A power transmission means composed of a gear (34) coupled to a rotating shaft of the wheel, a pinion (35) engaged with the gear to transmit rotational force, and a rack (37) engaged with the pinion; A cylinder 41 attached to one inner side of the inner case and having a working fluid therein, and a piston 43 interlocked with the rack and mounted on the inner side of the cylinder and elastically returned by a spring 47. Attenuation return means configured; And an elastic member (23) inserted between the outer case and the inner case to bring the wheel into intimate contact with the ground. The method of claim 1, The power transmission means is a door closer, characterized in that at least one auxiliary gear is installed between the gear (34) and the pinion (35).