KR20190119934A - Door closer - Google Patents

Abstract

The present invention relates to a door closer. The door closer is installed on a door and a door frame, and comprises: a housing attached to the door; a connection arm whose one end is movably connected to the door frame; a cam unit rotatably accommodated in the housing, wherein one end thereof protrudes to the outside of the housing to be connected to the other end of the connection arm; a spring unit which is connected to the cam unit to reciprocate by rotation of the cam unit, and accommodates a compression spring therein to be elastically pressed from the housing; and a planetary gear unit connected to a rack gear to convert a reciprocating motion of the rack gear into a rotary motion by a predetermined gear ratio. The present invention automatically closes a door by a gear instead of air or oil pressure to eliminate concern for air or oil pressure leakage, and smoothly closes the door by an accurate gear ratio even if a strong wind blows to prevent damage to the door by preventing the door from being slammed.

Description

DOOR CLOSER}

The present invention relates to a door closer, and more particularly to a door closer that mitigates an impact with the door frame when the door is closed.

In general, a door frame and a door are installed on a wall dividing the space of the building, and the user can move the divided space by opening or closing the door. And, the door is equipped with a door closer to open and close the door automatically.

And door closers are not usually applied to indoor doors, but mainly to fire doors.

In a room, when a user opens a door, the door is often forgotten, and since the door is kept open, there is a problem that the personal space is opened and personal life is not protected. In addition, when the outside wind is introduced in a state in which the door is opened, the door is hardly closed, causing a loud sound, and in severe cases, the door is broken.

Therefore, the present situation requires the development of a door closer applicable to the door of the room.

Meanwhile, air supply or hydraulic door closers have been disclosed as conventional door closers.

However, the conventional air supply or hydraulic door closer has a problem that the air (air) and the hydraulic leakage occurs, when the strong wind blows the strength of the air or hydraulic pressure does not stand the resistance of the wind causing a malfunction.

KR 10-2010-0112513 A

The present invention is to solve the conventional problems as described above, it is an object of the present invention to provide a door closer to automatically open and close the door through a gear other than air or hydraulic pressure.

Another object of the present invention is to provide a door closer capable of keeping the door open when the door is opened, which can be applied indoors with low noise.

Still another object of the present invention is to provide a door closer in which a door can be automatically opened from a predetermined angle even when the user opens the door without applying force until the door is fully opened.

Still another object of the present invention is to provide a door closer in which the automatic opening and closing of the door is quiet and smooth through a planetary gear having a predetermined gear ratio.

In order to achieve the object of the present invention as described above, the door closer according to an embodiment of the present invention, the door closer is installed in the door and the door frame, the housing is attached to the door; A connecting arm connected at one end to the door frame to be movable; A cam part rotatably received in the housing and having an end portion protruding to the outside of the housing and connected to the other end of the connection arm; A spring part connected to the cam part and reciprocally movable by rotation of the cam part, and accommodating a compression spring therein to be elastically pressed from the housing; And a planetary gear part connected to the rack gear to convert the reciprocating motion of the rack gear into a rotational motion through a predetermined gear ratio.

In the door closer according to an embodiment of the present invention, a sliding groove having a predetermined length is formed on a lower surface of the door frame, and the connection arm is provided at one end of the connection arm and is disposed in the sliding groove. It may further include a member.

In the door closer according to an embodiment of the present invention, a pair of stoppers for limiting the movement of the sliding member when the connection arm is moved; And a buffer member disposed between the pair of stoppers to mitigate the impact of the sliding member.

In the door closer according to an embodiment of the present invention, the connection arm is formed with a hole at the other end, the end of the cam portion protruding from the housing is inserted into the hole, the connection arm and the cam portion is interlocked with each other Can be.

In the door closer according to an embodiment of the present invention, the cam portion and the spring portion are connected, the first position in which the door is closed, the second position in which the compression spring is compressed to the maximum, and the door by a predetermined angle. And a link unit moving to an open third position and movable between the first and third positions.

In the door closer according to the embodiment of the present invention, when the cam portion rotates in one direction and the link portion is moved from the second position to the third position, the door is automatically opened by the pressing force of the compression spring. Can be.

In the door closer according to an embodiment of the present invention, the cam portion, the end is positioned at the end and the rotation shaft eccentric; And an avoidance groove that prevents interference with the rack gear during rotation.

In the door closer according to an embodiment of the present invention, the planetary gear unit, Pinion gear meshing with the rack gear; A first planetary gear unit disposed relatively close to the pinion gear; A second planetary gear unit disposed to be relatively spaced apart from the pinion gear than the first planetary gear unit; And a ring gear having an inner side engaged with an outer side of the first planetary gear unit or the second planetary gear unit.

In the door closer according to an embodiment of the present invention, a latch gear disposed between the pinion gear and the first planetary gear unit, the pinion gear and the rotation is interlocked; further comprising the first planetary gear unit The latch gear may further include a plurality of latches disposed at equal intervals around the latch gear so that the latch gear rotates in only one direction.

In the door closer according to an embodiment of the present invention, the first planetary gear unit includes: a first sun gear which is the latch gear; A first carrier having one surface facing one surface of the latch gear and having a latch installed thereon, the first protrusion having a rim protruding downward to prevent interference with the ring gear; And a plurality of first planetary gears having gears formed on an outer surface of the first carrier to be engaged with the ring gear.

In the door closer according to an embodiment of the present invention, the second planetary gear unit includes: a second sun gear meshed with the plurality of first planetary gears inside the plurality of first planetary gears; A second carrier whose rotation is interlocked with one surface facing the second sun gear; And a plurality of second planetary gears having gears formed on an outer surface of the second carrier to be engaged with the ring gear.

In the door closer according to an embodiment of the present invention, further comprising a third planetary gear unit meshed with the second planetary gear unit, wherein the third planetary gear unit, the inner side of the plurality of second planetary gear A third sun gear meshed with the plurality of second planetary gears; And a third carrier which is a balance weight to which rotation is interlocked by facing the third sun gear on one surface.

In the door closer according to an embodiment of the present invention, the planetary gear unit, a plurality of planetary gears are provided in the housing, and further comprises a slave gear for transmitting a rotational force between the planetary gear portion, the ring gear, the outer surface And a shaft groove into which a rotating shaft of the subordinate gear is inserted, and a balance additional portion may be installed on a gear that receives the last rotational force among the plurality of planetary gear parts.

1 is a perspective view showing a state of use of the door closer according to an embodiment of the present invention.
FIG. 2A is a sectional view taken along line AA ′ of the door frame of FIG. 1.
FIG. 2B is a bottom view of the door frame of FIG. 1.
3 is a perspective view of a door closer according to an embodiment of the present invention.
4 is an exploded perspective view of the components excluding the housing of FIG. 3.
Figure 5 is a schematic diagram showing the operating state of the spring portion and the cam portion of the door closer according to an embodiment of the present invention.
Figure 6 is a perspective view of the planetary gear portion of the door closer according to an embodiment of the present invention.
7 is a perspective view of the planetary gear unit except for the ring gear in FIG. 6.
8 is an exploded perspective view of FIG. 7.
9 is an exploded perspective view of FIG. 7 viewed from another angle.
10 is a view of the rear surface of the planetary gear unit in the case where there are a plurality of planetary gear units of the door closer according to the embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are assigned to the same components as much as possible even though they are shown in different drawings. In addition, in describing the embodiments of the present invention, if it is determined that the detailed description of the related well-known configuration or function interferes with the understanding of the embodiments of the present invention, the detailed description thereof will be omitted.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being “connected”, “coupled” or “connected” to another component, that component may be directly connected or connected to that other component, but there is another component between each component. It should be understood that may be “connected”, “coupled” or “connected”.

Hereinafter, a door closer according to an embodiment of the present invention will be described with reference to the drawings.

1 is a perspective view showing a state of use of the door closer according to an embodiment of the present invention, Figure 2 (a) is a cross-sectional view of the door frame of Figure 1 AA ', Figure 2 (b) of Figure 1 Bottom view of the door frame.

1 to 2, the door closer 1 according to the exemplary embodiment of the present invention may be installed in the door 10 and the door frame 20.

In other words, the door closer 1 is installed in the door 10, the connection arm 200 connects the door closure 1 and the door frame 20, and the connection arm (according to the opening and closing of the door 10) 200 may slide along the sliding groove 21 in the door frame 20.

The door frame 20 may have a sliding groove 21 formed on a lower surface of the upper portion in a rectangular frame corresponding to the door 10.

In this case, the sliding groove 21 may have a predetermined length, and stoppers 22 may be provided at both ends thereof. The stopper 22 may limit the movement of the sliding member 210 to be described later when the connection arm 200 moves.

In addition, the sliding groove 21 is provided with a buffer member 23 between the plurality of stoppers 22 to mitigate the impact of the sliding member 210 when the door 10 is opened and closed. In the drawing, the shock absorbing member 23 is disposed in contact with the pair of stoppers 22, but this is only one embodiment, and the user or the manufacturer's option to mitigate the impact of the sliding member 210 and the stopper 22. If only a number, it may be installed anywhere in the sliding groove (21). Therefore, the stopper 22 and the shock absorbing member 23 provided on either side limit the opening of the door 10 when the door 10 is opened, and the stopper 22 and the shock absorbing member 230 provided on the other side of the door It is possible to limit the closing of the door 10 when the 10 is closed.

3 is a perspective view of a door closer according to an embodiment of the present invention, Figure 4 is an exploded perspective view of the components excluding the housing in FIG.

3 and 4, the door closer according to the embodiment of the present invention includes a housing 100, a connection arm 200, a cam part 300, a spring part 400, a rack gear 600 and a planetary gear part. 700 may be included.

The housing 100 may be attached to an upper portion of the door 10 so that the connection arm 200 may be connected to the bottom surface of the door frame 20 when the connecting arm 200 is rotated horizontally.

As shown in the figure, the housing 100 may be a hollow rectangular parallelepiped, and end caps 110 may be provided at both ends in the longitudinal direction to prevent internal components from being separated from the housing 100.

End cap 110 is provided with a protrusion (not shown) in the inner direction of the housing 100, it can support a compression spring (not shown) to be described later.

The connection arm 200 may connect the housing 100 and the door frame 20.

A sliding member 210 is disposed at one end of the connecting arm 200, and the sliding member 210 is inserted into the sliding groove 21 of the door frame 20, so that the connecting arm 200 is formed of the sliding groove 21. It can slide along the longitudinal direction.

For example, one end of the connection arm 200 may be formed with a through hole (not shown), the sliding member 210 is inserted into the through hole, the sliding member 210 may be disposed in the sliding groove 21.

The connection arm 200 is movable along the longitudinal direction of the sliding groove 21 of the door frame 20 as the door 10 rotates.

The cam part 300 may be accommodated to be rotatable inside the housing 100. The cam unit 300 may have an eccentric rotation shaft disposed therein, and may rotate about the rotation shaft.

End portions 310 of the cam part 300 may be positioned at both ends of the rotation shaft. The end 310 may protrude out of the housing 100. The other end of the connection arm 200 may be connected to the end 310 of the cam part 300.

For example, a hole (unsigned) may be formed at the other end of the connection arm 200, and an end 310 of the cam part 300 may be inserted. In this case, gears may be formed on the inner circumferential surface of the hole formed at the other end of the connecting arm 200 and the outer circumferential surface of the end portion 310 of the cam part 300, respectively, and may be engaged with each other by being engaged with each other.

The cam part 300 may have an evacuation groove 320 formed on an outer surface thereof. When the cam unit 300 is eccentrically rotated about the eccentric rotation axis, the cam unit 300 may prevent interference with the rack gear 600 to be described later through the avoidance groove 320.

The cam part 300 may have a link groove 330 formed on an outer surface thereof. The link groove 330 is inserted so that the link unit 500 to be described later is rotatably connected, and when the cam unit 300 is rotated by a predetermined angle, the link unit 500 is a partition wall 331 formed in the link groove 330. The cam part is no longer rotated by the blockage.

The spring part 400 may be accommodated in the housing 100 and may be interlocked with the cam part 300. The spring part 400 is connected to the cam part 300 and is reciprocated by the rotation of the cam part 300. That is, the spring unit 400 may be connected by the cam unit 300 and the link unit 500 to be described later. The spring unit 400 may have an end relatively far from the cam unit 300.

The spring unit 400 may accommodate a compression spring (not shown) therein.

The compression spring may be exposed to the outside of the spring 400, that is, the inside of the housing 100, through the open surface of the spring 400.

One end of the compression spring may be supported by the end cap 110, and the protrusion of the end cap 110 may be inserted into the compression spring. The compression spring may elastically support the spring portion 400 from the end cap 110. That is, the spring unit 400 may be elastically pressed from the housing 100 by the compression spring.

The spring unit 400 may be combined with the rack gear 600 to be described later. When the spring 400 is moved by the compression spring, the rack gear 600 interlocked with the spring 400 may also be moved.

The link part 500 may be disposed between the spring part 400 and the cam part 300, and the spring part 400 and the cam part 300 may be interlocked by the link part 500.

Figure 5 is a schematic diagram showing the operating state of the spring portion and the cam portion of the door closer according to an embodiment of the present invention.

FIG. 5A illustrates a first position of the link unit 500 in which the cam unit 300 is rotated, that is, the closed state before the door 10 is opened, and one end of the link unit 500 is a spring. It is connected to the unit 400, the other end of the link unit 500 is located on the lower side in the drawing.

FIG. 5B illustrates a portion of the link part 500 in which the cam part 300 is partially rotated, that is, the compression spring (not shown) of the spring part 400 while the door 10 is opened is maximally compressed. As shown in the second position, one end of the link unit 500 is connected to the spring unit 400, and the other end of the link unit 500 is located in the middle of the drawing.

5 (c) shows the third position of the link portion 500 in which the cam portion 300 is completely rotated, that is, the door 10 is fully opened, and one end of the link portion 500 is a spring portion. It is connected to 400, the other end of the link unit 500 is located on the upper side in the figure. At this time, the link unit 500 is pressed by the compression spring of the spring unit 400, and the cam unit 300 is restricted from rotation by the housing 100, so that the link unit 500 is caught by the cam unit 300. As a result, since the rack gear 600, which will be described later, cannot be moved, the door 10 may be kept open.

Meanwhile, in the process of opening the door 10, the link unit 500 may move from the first position to the third position.

While the link unit 500 moves from the first position to the third position, the cam unit 300 may rotate in one direction, that is, the door 10 is opened.

In this case, the second position is a state in which the compression spring (not shown) of the spring unit 400 is compressed to the maximum, and thus the link unit 500 moves while the link unit 500 is moved from the second position to the third position. Even if no force is applied, the door 10 may be automatically opened because the cam part 300 rotates in one direction by the pressing force of the compression spring (not shown) of the spring part 400. That is, when the user opens the door 10 only to a predetermined angle, the door 10 may be automatically opened to the fully open position.

One end of the rack gear 600 is connected to the spring unit 400. That is, the rack gear 600 may be interlocked with the spring unit 400. In other words, when the door 10 is opened by the user, the rack gear 600 is moved to the left in the drawing, and thus the spring 400 is also moved to the left and the compression spring is pressed. On the contrary, when the door 10 is closed, the compression spring is restored by the elastic force, and the spring 400 and the rack gear 600 are moved to the right in the drawing.

6 is a perspective view of the planetary gear unit of the door closer according to an embodiment of the present invention, Figure 7 is a perspective view of the planetary gear unit excluding the ring gear in Figure 6, Figure 8 is an exploded perspective view of Figure 7, Figure 9 7 is an exploded perspective view of FIG. 7 viewed from another angle.

6 to 9, the door closer according to the exemplary embodiment of the present invention may include a planetary gear part 700.

The planetary gear unit 700 may be connected to the rack gear 600 and convert the reciprocating motion of the rack gear 600 into a rotational motion. The planetary gear unit 700 may determine the amount of rotation of the pinion gear 710 generated by the reciprocating motion of the rack gear 600 through a predetermined gear ratio.

The planetary gear unit 700 may include a pinion gear 710, a latch gear 721, a first planetary gear unit 720, a second planetary gear unit 730, and a ring gear 750.

The pinion gear 710 may be meshed with the rack gear 600, and may convert the reciprocating motion of the rack gear 600 into a rotational motion.

The latch gear 721 may be disposed between the pinion gear 710 and the first planetary gear unit 720, and the pinion gear 710 may rotate with the pinion gear 710.

The first planetary gear unit 720 may be disposed closer to the pinion gear 710 than the second planetary gear unit 730 described later.

The first planetary gear unit 720 may include a latch gear 721, a first carrier 722, and a first planetary gear 723. The latch gear 721 may be a first sun gear.

The latch gear 721 may be installed on one surface of the first carrier 722.

The first carrier 722 is preferably formed such that the edge 722a protrudes in the direction toward the pinion gear 710.

The first carrier 722 can include a latch 724. The latch 724 may be coupled to and rotated on one surface of the first carrier 722. The latch 724 may be engaged with the latch gear 721, and the pinion gear 710 and the latch gear 721 may be rotated by allowing the first carrier 722 to rotate only in one direction in which the latch gear 721 rotates. The rotational force of may be transmitted to the first carrier 722.

In this case, a plurality of latches 724 may be provided. Preferably, three or more latches 724 may be provided. The plurality of latches 724 may be disposed at equal intervals from the center of the pinion gear 710, the latch gear 721, or the first carrier 722.

The latches 724 disposed at equal intervals from each other may not be engaged with the latch gear 721 because the latches 724 disposed on the lower side are struck by gravity when the first carrier 722 rotates. Since the latch 724 disposed above is engaged with the latch gear 721, the rotational force of the latch gear 721 may be transmitted to the first carrier 722.

In addition, even if the latch 724 disposed on the lower side due to gravity is struck downward, the interference with the ring gear 750 may be prevented because it is blocked by the protruding edge 722a.

For reference, in one embodiment of the present invention, the latch 724 is not elastically engaged with the latch gear 721. For example, if the latch 724 is engaged by the latch gear 721 through the elastic member, the latch 724 is pressed against the latch 724 that is pressed when the door 10 is opened, that is, when the latch gear 721 rotates counterclockwise. It may cause noise.

The first planetary gear 723 may be installed on the other surface of the first carrier 722. A plurality of first planetary gears 723 may be provided. Each of the first planetary gears 723 has a gear (unsigned) formed on the outside thereof, and the gears protrude radially from the center of the first carrier 722 more than the edge 722a of the first carrier 722. And 750.

The second planetary gear unit 730 is relatively spaced apart from the pinion gear 710 than the first planetary gear unit 720, and may be disposed closer to the third planetary gear unit 740, which will be described later.

The second planetary gear unit 730 may include a second sun gear 731, a second carrier 732, and a second planetary gear 733.

The second sun gear 731 may be disposed inside the plurality of first planetary gears 723 and may be engaged with all of the plurality of first planetary gears 723.

One surface of the second carrier 732 may face the second sun gear 731, and the second carrier 732 may be interlocked with the second sun gear 731.

The second planetary gear 733 may be installed on the other surface of the second carrier 732. A plurality of second planetary gears 733 may be provided. Gears (unsigned) are formed on the outside of the second planetary gear 733, respectively, and the gears protrude radially from the edge of the second carrier 732 radially from the center of the second carrier 732 and the ring gear 750. Can be combined with.

The third planetary gear unit 740 may be disposed in close proximity to the second planetary gear unit 730.

The third planetary gear unit 740 may include a third sun gear 741 and a third carrier 742.

The third sun gear 741 may be disposed inside the plurality of second planetary gears 733, and may be engaged with all of the plurality of second planetary gears 733.

One surface of the third carrier 742 may face the third sun gear 741, and the third carrier 742 may be interlocked with the third sun gear 741. In this case, the third carrier 742 is preferably a counter weight.

In the door closer according to the embodiment of the present invention, the pinion gear 710, the latch gear 721, the first carrier 722, the second sun gear 731, the second carrier 732, and the third sun gear 741. ) And the third carrier 742 may be rotated in the same direction. The first planetary gear 723 and the second planetary gear 733 may be rotated in the same direction.

The third carrier 742 may be formed to be heavier than other gears or gear units disposed in the door closer according to the embodiment of the present invention as a counterweight. For example, when the door 10 opened by the user is automatically closed, the rack gear 600 is moved to the right in the drawing by the spring of the spring 400, and the pinion gear 710 rotates clockwise, Accordingly, the third carrier 742 may also rotate clockwise. At this time, the third carrier 742 can perform the continuous rotation by obtaining the inertial force due to the weight can be more easily performed to close the door 10.

As shown in FIG. 6, the ring gear 750 may have a shaft groove 751 formed on the outside thereof. The shaft groove 751 is for inserting the rotating shaft of the slave gear 760, that is, the slave gear shaft 761, which will be described later.

The number of planetary gear units forming the planetary gear unit 700 is not particularly limited. For example, the gear ratio may be converted according to the number of the second planetary gear units 730 disposed between the first planetary gear unit 720 and the third planetary gear unit 740. That is, the second planetary gear unit 730 may be arranged in various numbers according to the manufacturer's intention along with the first planetary gear unit 720 and the third planetary gear unit 740.

The second planetary gear unit 730 may be provided in plural in order to change the gear ratio in a large width. When the planetary gear part 700 becomes thick due to the plurality of second planetary gear units 730, the planetary gear part 700 may be provided. Since the width of the housing 100 may be greater, the number of the second planetary gear units 730 may be limited by the width of the housing 100.

For reference, as mentioned above, while the link unit 500 moves from the second position to the third position, the rack gear 600 interlocked with the spring unit 400 moves to the right in the drawing and the latch gear The planetary gear unit 700 may be operated by the 721 latching the latch 724, but the planetary gear unit 700 is for adjusting the gear ratio in the process of closing the door 10. No interference

10 is a view of the rear surface of the planetary gear unit in the case where there are a plurality of planetary gear units of the door closer according to the embodiment of the present invention.

Referring to FIG. 10, a plurality of planetary gear units 700 may be provided.

As mentioned above, since the number of the second planetary gear units 730 of the planetary gear unit 700 may be limited to the width of the housing 100, the inside of the housing 100 for a large width change of the gear ratio. The planetary gear portion 700 may be arranged in plural in the longitudinal direction of the housing 100, and the subordinate gear 760 may be disposed to transmit rotational force between the planetary gear portions 700. At this time, it is preferable that the ring gear 750 has a shaft groove 751 in which the subordinate gear shaft 761 can be inserted in all directions. That is, even if the arrangement direction of the plurality of planetary gear parts 700 or the ring gear 750 is changed, the ring gears 750 of the planetary gear parts 700 adjacent to each other have the shaft grooves 751 facing each other, so that the slave gear shaft 761 is closed. Can be inserted.

In this case, it is preferable that a counter weight is disposed on the gear that receives the rotational force transmitted from the rack gear 600 lastly, and this counterweight may be the same as the role of the third carrier 742 mentioned above.

In addition, upon transmission of the rotational force through the subordinate gear 760 from one planetary gear unit 700 to the neighboring planetary gear unit 700, each planetary gear unit (unsigned) is a sun gear engaged with the subordinate gear 760. (Unsigned) may be further provided, but various shapes and arrangements of gears may be used depending on the manufacturer's intention as long as the rotational force is transmitted by the subordinate gear 760 without being limited thereto.

Hereinafter, the operation of the door closer according to an embodiment of the present invention will be described with reference to the accompanying drawings.

A door closer 1 is attached to the door 10, and a sliding groove 21 is formed at a bottom of the upper side of the door frame 20, and the door closer 1 and the sliding groove 21 are connected to the connection arm 200. Are connected by.

The connection arm 200 connects the cam member 300 protruding out of the housing 100 of the door closer 1 and the sliding member 210 disposed in the sliding groove 21.

When the user wants to move from one space to another space through the door, the user pushes or pulls the door handle (not shown).

In this case, the sliding member 210 may move along the sliding groove 21 and may move up to the stopper 22 disposed in the sliding groove 21. The door 10 may be opened by the buffer member 23 disposed adjacent to the stopper 22 to cushion the impact of the sliding member 210 and the stopper 22.

As the door 10 is opened, the cam part 300 connected to the connecting arm 200 rotates in one direction. Referring to the drawing, as the door 10 is opened, the cam part 300 is rotated clockwise.

The spring part 400 connected to the cam part 300 and the link part 500 by the clockwise rotation of the cam part 300 is moved to the left in the drawing, and the link part 500 is moved to the first position (FIG. 5A). And a compression spring (not shown) accommodated in the spring part 400 is pressed between the end cap 110 and the spring part 400.

In this case, the rack gear 600 is also moved to the left side by the left movement of the spring 400 in the drawing, the pinion gear 710 meshed with the rack gear 600 is rotated in the counterclockwise direction, the pinion gear ( The latch gear 721 associated with 710 is also rotated counterclockwise.

Even though the pinion gear 710 and the latch gear 721 rotate in the counterclockwise direction, the latch gear 721 is formed so as not to be caught by the latch, so that a part of the first planetary gear unit 720 of the planetary gear part 700 and the second to the second are made. The three planetary gear units 730 and 740 are not rotated.

Meanwhile, as shown in (a) of FIG. 5, the cam part 300 may rotate and the link part 500 may move.

Since the cam part 300 is eccentric in rotation, and the link part 500 is connected to one side of the cam part 300, the rotation of the cam part 300 and the movement of the link part 500 are limited. In detail, the cam part 300 and the link part 500 are connected to one side so that the cam part 300 rotates, but the cam part 300 is the partition wall of the link groove 330 formed so that the link part 500 is connected and rotated. It is impossible to rotate more than a predetermined angle by 331 (see FIG. 4).

For example, (a) of FIG. 5 is a view (first position) of the cam part 300 and the link part 500 before the door 10 is opened, and (b) of FIG. 5 is in the process of opening the door 10. The cam part 300 and the link part 500 are in a state (second position), and FIG. 5C shows the cam part 300 and the link part 500 in a state in which the door 10 is completely opened (third position). Location).

While the link unit 500 is moving from the first position to the second position, that is, the user opens the door 10 by a predetermined angle, the compression spring (not shown) of the spring unit 400 is pressed, and the rack gear 600 is moved to the left in the drawing and the planetary gear portion 700 is not operated. In other words, the latch gear 721 of the planetary gear unit 700 can rotate clockwise in the drawing when the latch gear 721 is caught by the latch 724, so that the rack gear 600 is moved to the left in the drawing to latch the pinion gear 710. Even though the gear 721 rotates in the counterclockwise direction, the latch 724 located on the upper portion is brought into contact with the latch gear 721 by gravity, but the planetary gear portion 700 is not engaged with the latch gear 721. It doesn't work.

When the link unit 500 reaches the second position, that is, the door 10 is opened by a predetermined angle by the user, the compression spring is in a state of being fully pressed.

At this time, since the link unit 500 moves from the first position to the third position and the cam unit 300 is maintained in one direction, even if the user does not open the door 10 by more than a predetermined angle, It can be opened automatically by the compression spring and the rotation of the cam unit 300 in one direction.

In addition, while the link unit 500 moves from the second position to the third position, that is, the door 10 is automatically opened at a predetermined angle or more, the sliding member 210 of the connecting arm 200 is a buffer member ( The shock is mitigated by 23) and stopped by the stopper 22 and the door 10 is completely opened.

For reference, while the link unit 500 is moved from the second position to the third position, the rack gear 600 may be moved to the right in the drawing to operate the planetary gear unit 700, but the planetary gear unit 700 may be operated. Since the gear ratio is adjusted when the door 10 is closed, even if the planetary gear unit 700 operates, the door 10 is not prevented from opening.

When the door 10 is fully opened as shown in (c) of FIG. 5, the connecting portion of the cam part 300 and the link part 500 is moved upward in the drawing, when the user does not close the door 10 and the spring part The link part 500 continues to push the cam part 300 by the compression of the compression spring accommodated in the 400, but is blocked by the partition wall 331 of the link groove 330 formed in the cam part 300, and thus the cam part 300. ) Is not rotated so that the door 10 may remain open. For reference, according to the manufacturer's intention, the position of the partition wall 331 of the cam portion 300 mentioned above, and the length of the sliding groove 21 and the connecting arm 200 of the door frame 20 is made in advance, The angle of the state in which the door 10 is open can be determined.

In addition, when the user applies a force in the closing direction of the door 10 in the state (c) of FIG. 5, the cam unit 300 rotates in the counterclockwise direction as shown in FIG. 5 (b) and the spring unit 400 is compressed. The spring is momentarily pressed, the movement of the link portion 500 is generated by the compression of the compression spring as shown in Figure 5 (a), the movement of the spring 400 and the rack gear 600 to the right in the drawing Occurs.

At this time, the pinion gear 710 meshed with the rack gear 600 is rotated clockwise in the drawing, and the latch gear 721 linked with the pinion gear 710 is also rotated in the clockwise direction. When the latch gear 721 is rotated in the clockwise direction, the latch gear 724 is locked, so that the first carrier 722 on which the latch 724 is installed is also rotated in the clockwise direction, and the first planetary gear 723 is fixed. The first planetary gear 723 is moved in a clockwise direction in response to the movement of the first carrier 722.

The second sun gear 731 of the second planetary gear unit 730 is rotated in a clockwise direction by engagement with the plurality of first planetary gears 723, and the second carrier 732 interlocked with the second sun gear 731. Also rotated in the clockwise direction, the second planetary gear 733 is meshed with the fixed ring gear 750 and rotated counterclockwise, and the second planetary gear 733 is moved in accordance with the movement of the second carrier 732. Is moved clockwise.

The third sun gear 741 of the third planetary gear unit 740 is rotated in a clockwise direction by engagement with the plurality of second planetary gears 733, and the third carrier 742 interlocked with the third sun gear 741. It is also rotated clockwise.

At this time, since the third carrier 742 has a heavier weight than the other gears of the planetary gear unit 700 as a counterweight, the third carrier 742 rotates through inertia in a clockwise direction.

That is, when the door 10 is closed, when the pinion gear 710 rotates, the third carrier 742 is relatively rotated a lot, and the rotation of the third carrier 742 is the weight of the third carrier 742. By retaining the inertia force, the door 10 can be closed faster and with less force.

In this case, when the door 10 is closed to the door frame 20, the sliding member 210 installed in the connecting arm 200 slides along the sliding groove 21 and is stopped by the stopper 22 by the shock absorbing member 23. ) And the impact that strikes the) are alleviated and stopped by the stopper 22.

What has been described above is merely an embodiment for implementing the door closer according to the present invention, the present invention is not limited to the above embodiment, the present invention without departing from the gist of the invention claimed in the claims below Anyone with ordinary knowledge in the art will have the technical spirit of the present invention to the extent that it can be variously modified and implemented.

1: Door Closure 10: Door 20: Door Frame
21: sliding groove 22: stopper 23: buffer member
100: housing 110: end cap 200: connection arm
210: sliding member 300: cam portion 310: end
320: evasion groove 330: link groove 331: bulkhead
400: spring portion 500: link portion 600: rack gear
700: planetary gear unit 710: pinion gear 720: first planetary gear unit
721: Latch Gear 722: First Carrier 722a: Edge
723: first planetary gear 724: latch 730: second planetary gear unit
731: second sun gear 732: second carrier 733: second planetary gear
740: third planetary gear unit 741: third sun gear 742: third carrier
750: ring gear 751: shaft groove 760: subordinate gear
761: Subordinate gear shaft

Claims (13)

In the door closer installed on the door and the door frame,
A housing attached to the door;
A connecting arm connected at one end to the door frame to be movable;
A cam part rotatably received in the housing and having an end portion protruding to the outside of the housing and connected to the other end of the connection arm;
A spring part connected to the cam part and reciprocally movable by rotation of the cam part, and accommodating a compression spring therein to be elastically pressurized from the housing;
A rack gear having one end connected to the spring part; And
A planetary gear part connected to the rack gear to convert the reciprocating motion of the rack gear into a rotational motion through a predetermined gear ratio;
Door closer comprising a.
The method of claim 1,
The lower surface of the door frame is formed with a sliding groove of a predetermined length,
The connecting arm is,
A sliding member installed at one end of the connection arm and disposed in the sliding groove;
Door closer comprising more.
The method of claim 2,
A pair of stoppers for limiting the movement of the sliding member when the connection arm is moved; And
A buffer member disposed between the pair of stoppers to mitigate the impact of the sliding member;
Door closer comprising more.
The method of claim 1,
The connecting arm has a hole formed at the other end,
The cam portion is an end projecting from the housing is inserted into the hole,
A door closer in which the connection arm and the cam unit are interlocked with each other.
The method of claim 1,
The cam unit and the spring unit are connected to each other, the first position in which the door is closed, the second position in which the compression spring is maximally compressed, and the third position in which the door is opened by a predetermined angle are moved. A link portion movable between the third position and the third position;
Door closer comprising more.
The method of claim 5,
And the door is automatically opened by the pressing force of the compression spring when the cam portion rotates in one direction and the link portion is moved from the second position to the third position.
The method of claim 1,
The cam portion,
A rotating shaft having the end positioned at the end and eccentric; And
Avoiding grooves to prevent interference with the rack gear during rotation;
Door closer comprising a.
The method of claim 1,
The planetary gear unit,
A pinion gear meshed with the rack gear;
A first planetary gear unit disposed relatively close to the pinion gear;
A second planetary gear unit disposed to be relatively spaced apart from the pinion gear than the first planetary gear unit; And
A ring gear having an inner side engaged with an outer side of the first planetary gear unit or the second planetary gear unit;
Door closer comprising a.
The method of claim 8,
A latch gear disposed between the pinion gear and the first planetary gear unit, the latch gear interlocked with the pinion gear;
More,
The first planetary gear unit,
A plurality of latches arranged at equal intervals about the latch gears such that the latch gears rotate in only one direction;
Door closer comprising more.
The method of claim 9,
The first planetary gear unit,
A first sun gear that is the latch gear;
A first carrier having one surface facing one surface of the latch gear and having a latch installed thereon, the first protrusion having a rim protruding downward to prevent interference with the ring gear; And
A plurality of first planetary gears having gears formed on an outer surface of the first carrier to be engaged with the ring gear;
Door closer comprising a.
The method of claim 8,
The second planetary gear unit,
A second sun gear meshed with the plurality of first planetary gears inside the plurality of first planetary gears;
A second carrier whose rotation is interlocked with one surface facing the second sun gear; And
A plurality of second planetary gears having gears formed on an outer surface of the second carrier to be engaged with the ring gear;
Door closer comprising a.
The method of claim 11,
And a third planetary gear unit meshed with the second planetary gear unit.
The third planetary gear unit,
A third sun gear engaged with the plurality of second planetary gears inside the plurality of second planetary gears; And
A third carrier which is a balance weight to which rotation is interlocked with the third sun gear facing one surface;
Door closer comprising a.
The method of claim 1,
The planetary gear unit,
A plurality of gears provided in the housing and transmitting rotational force between the planetary gear parts;
More,
The ring gear,
A shaft groove into which a rotating shaft of the subordinate gear is inserted into a portion of an outer surface thereof;
Including,
A balance closer is installed in the gear that receives the last rotational force among the plurality of planetary gears.

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