KR102373709B1 - Closing force auxiliary device for door closer - Google Patents

Abstract

A closing force assisting device for a door closer is disclosed. A closing force assisting device for a door closer according to the present invention includes a main body disposed adjacent to the door closer; It is provided rotatably inside the main body, and is connected to a rotation shaft of the door closer that rotates between a closed position and an open position of the door to transmit a closing force to the door closer, and a groove is formed in response to the closing position of the door. formed cam; and a closing force providing unit provided inside the main body to provide a closing force to the cam, wherein the closing force providing unit includes: a roller provided in close contact with an outer circumferential surface of the cam; a roller support part that reciprocates along a guide slot formed to be inclined with respect to the cam part on the inner surface of the body part, and is coupled to the center of the roller to support the roller; and a compression spring provided in the guide slot, one end elastically supporting the roller support, and providing a closing force to the cam when the roller moves along an outer circumferential surface of the cam and enters the groove.

Description

CLOSING FORCE AUXILIARY DEVICE FOR DOOR CLOSER

The present invention relates to a closing force assisting device for a door closer.

In the event of a fire, the fire door not only blocks the flame from spreading to the surrounding area, but also blocks the inflow of smoke or toxic gas through the emergency exit to secure a safe evacuation route for the occupants, thereby preventing human casualties.

An automatic closing device is installed to substantially secure the effect of the fire door. The automatic closing device includes a control unit for the automatic closing device installed on the door frame, a door closer installed on the fire door, and a closing force auxiliary device for the door closer installed on the fire door and connected to the door closer to provide a closing force to the door closer. .

The fire door is normally kept open, and when a fire detection signal such as smoke is received, the control unit for the automatic closing device is activated to release the jamming state of the fire door. Accordingly, the fire door is closed by the closing force of the door closer, thereby preventing the spread of smoke and fluid gas due to fire and also preventing the spread of flames.

However, even when the fire door is closed by the door closer due to fire, etc., depending on the operation of the smoke control system, the air introduced into the room is discharged to the part where the fire door is open, which is the outside, thereby forming wind pressure. There is a risk that a fire door designed to be fully closed may not be able to close completely under the influence of the wind pressure even if the door closer operates. If the fire door does not close completely, smoke or toxic gas leaks through the open gap of the fire door and contaminates escape routes such as emergency stairs.

Accordingly, in order to increase the closing force of the conventional fire door, a closing force auxiliary device is installed adjacent to the door closer. The closing force auxiliary device uses the elastic force of the compression spring, but when the size of the fire door increases, a compression spring with a high elastic modulus must be used to obtain a larger closing force, so there is a problem in the selection of the compression spring.

Republic of Korea Patent Publication No. 10-2009-0095248 (published on September 9, 2009)

Therefore, the technical problem to be solved by the present invention is to provide a closing force auxiliary device for a door closer that can provide a larger closing force to the door closer even when the same compression spring is used.

According to one aspect of the present invention, a body portion disposed adjacent to the door closer; It is provided rotatably inside the main body, and is connected to a rotation shaft of the door closer that rotates between a closed position and an open position of the door to transmit a closing force to the door closer, and a groove is formed in response to the closing position of the door. formed cam; and a closing force providing unit provided inside the main body to provide a closing force to the cam, wherein the closing force providing unit includes: a roller provided in close contact with an outer circumferential surface of the cam; a roller support part reciprocating along a guide slot formed to be inclined with respect to the cam part on the inner surface of the body part, and coupled to the center of the roller to support the roller; and a compression spring provided in the guide slot, one end elastically supporting the roller support, and providing a closing force to the cam when the roller moves along the outer circumferential surface of the cam and enters the groove. A closing force assist may be provided.

The center of the roller may be positioned above the center of the cam, and the guide slot may be inclined by 4° to 10° with respect to the cam.

The closing force providing unit further includes a power bolt that is detachably coupled to the guide slot and is in close contact with the other end of the compression spring to adjust the elastic force of the compression spring, and the power bolt is injected with grease communicating with the guide slot. A hole may be formed.

a cam in which the roller is in close contact with the outer circumferential surface of the cam portion and the groove is formed on the outer circumferential surface; a cam shaft coupled to a central portion of the cam and connected to a rotation shaft of the door closer; and friction reducing members respectively coupled to both ends of the camshaft, wherein the groove may be formed to become deeper from the outer circumferential surface of the cam toward the closing position of the door.

The groove is formed on an outer circumferential surface of the cam corresponding to a first position adjacent to the closed position of the door, has a convex first radius of curvature in the direction of the outer circumferential surface of the cam, and is initially attached to the cam when the roller enters. a first curved surface providing a closing force; and a second radius of curvature formed on the outer circumferential surface of the cam corresponding to a second position adjacent to the closed position of the door, formed continuously on the first curved surface and convex in the direction of the outer circumferential surface of the cam, into which the roller enters a second curved surface providing a closing force greater than the initial closing force in the case of the first position, wherein the first position is from a 15° to 16° open position to a 4° to 6° open position, and wherein the second The position is from an open position of the door by 4 ° to 6 ° to a closed position of 0 °, the depth increases from the first curved surface to the second curved surface, and the second radius of curvature is smaller than the first radius of curvature. can

A width of an outer circumferential surface of the cam to which the roller is closely adhered may be formed to be smaller than a width of the roller.

The roller support portion is connected to one end of the compression spring, the support member reciprocating along the guide slot; a pair of support arms having one end coupled to the support member and the other end disposed opposite to the center of the roller; and a pin member that is coupled through the other end of the pair of support arms and the center of the roller.

In the guide slot, both ends of the pin member are inserted, respectively, and guide grooves for guiding and limiting the reciprocating motion of the support member may be formed long.

In an embodiment of the present invention, a guide slot is formed on the inner surface of the main body to be inclined with respect to the cam to increase the elastic force of the compression spring transmitted to the cam by the roller, thereby providing a greater closing force to the door closer even when the same compression spring is used. can provide

1 is a view showing a state in which the closing force auxiliary device for a door closer according to the present invention is installed.
2A to 2C are views for explaining a process of closing the door.
Figure 3 is a combined perspective view of the closing force auxiliary device for a door closer according to the present invention.
4 is an exploded perspective view of the closing force auxiliary device for a door closer according to the present invention.
FIG. 5 is a cross-sectional view taken along line AA of FIG. 3 .
6 is a cross-sectional view taken along line BB of FIG. 3 .
7 to 10 are views showing the position of the roller with respect to the cam according to the rotation of the door.
11 is a view showing the closing force provided to the cam in the closed position of the door according to the present invention.
12 is a graph showing the difference in closing force between the case where the inclination angle of the guide slot is 7° and the inclination angle of the guide slot is 0° according to the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

1 is a view showing a state in which the closing force auxiliary device for a door closer according to the present invention is installed, FIGS. 2A to 2C are views for explaining a process of closing the door, and FIG. 3 is a closing diagram for a door closer according to the present invention. It is a combined perspective view of the auxiliary force device, FIG. 4 is an exploded perspective view of the closing force auxiliary device for a door closer according to the present invention, FIG. 5 is a cross-sectional view taken along AA of FIG. 3, FIG. 10 is a view showing the position of the roller with respect to the cam according to the rotation of the door, FIG. 11 is a view showing the closing force provided to the cam in the closed position of the door according to the present invention, and FIG. 12 is a guide according to the present invention This is a graph showing the difference in closing force between the case where the inclination angle of the slot is 7° and the case where the inclination angle of the guide slot is 0°.

Referring to Figure 1, an automatic closing device for closing the door (D) is installed. The automatic closing device includes a control unit 100 for the automatic closing device, a door closer 200 , and a closing force auxiliary device 300 for the door closer.

The control unit 100 is installed on the upper side of the door frame F, and the door closer 200 is installed on the door D, such as a fire door. And the arm 210 of the door closer 200 is hinged to the control unit 100 so that the control unit 100 and the door closer 200 are interlocked together with the door (D).

In addition, the closing force auxiliary device 300 for the door closer is installed on the door (D) and is disposed adjacent to the door closer (200). The closing force auxiliary device 300 is connected to a rotation shaft (not shown) of the door closer 200 that rotates between a closed position in which the door D is completely closed and an open open position to increase the closing force of the door closer 200 . make it

And, as shown in FIG. 2A , in normal times, the control unit 100 restrains the arm 210 of the door closer 200 installed on the door D to maintain the door D in an open state.

And, as shown in FIG. 2B , when a fire occurs, the control unit 100 releases the restraint state of the arm 210 of the door closer 200 to the elasticity or hydraulic pressure of the spring (not shown) of the door closer 200 . The closing force auxiliary device 300 ) starts to provide a closing force to the door closer 200, and as the door D is rotated, the closing force provided by the closing force auxiliary device 300 is gradually increased.

And as shown in FIG. 2c, when the door D is further rotated and positioned at 4° to 6° adjacent to the closed position, the closing force auxiliary device 300 provides a larger closing force to the door closer 200 And, as the door (D) is rotated, the closing force provided by the closing force assisting device 300 is gradually increased to close the door (D).

As described above, the closing force auxiliary device 300 for a door closer according to the present invention that increases the closing force of the door closer 200 that closes the door D when a fire occurs will be described below.

3 to 12 , the closing force assisting device 300 for a door closer according to the present invention includes a body part 310 installed on the door D and disposed adjacent to the door closer 200, and the body part The cam part 330 is provided rotatably inside the 310 and is connected to the rotation shaft of the door closer 200 to transmit the closing force to the door closer 200 , and the cam part 330 is provided inside the body part 310 . ) includes a closing force providing unit 350 that provides a closing force.

The main body 310 forms the exterior of the closing force auxiliary device 300 for the door closer 200 .

The body part 310 is disposed under the door closer 200 , and the body part 310 can be installed on the door D using the bracket 317 .

The main body 310 may be composed of an upper body 311 and a lower body 312 to facilitate disassembly, assembly, and maintenance. And the upper body 311 and the lower body 312 are fastened by the fastening bolts 316 to configure the main body (310).

And inside the main body part 310, the cam part 330 is connected to the door closer 200 and transmits the closing force to the door closer 200, and the closing force providing part 350 which provides the closing force to the cam part 330. ) is provided.

The cam unit 330 according to the present embodiment serves to transmit the closing force provided by the closing force providing unit 350 to the door closer 200 .

The cam part 330 includes a cam 331 rotatably provided inside the body part 310, a cam shaft 335 coupled to the center of the cam 331 and connected to the rotation shaft of the door closer 200, and a camshaft ( It is coupled to both ends of the 335) and includes a friction reducing member 338 inherent in the main body 310.

The cam 331 is connected to the rotation shaft of the door closer 200 through the camshaft 335 coupled to the center and rotates together with the rotation shaft of the door closer 200 . Here, the rotation shaft of the door closer 200 rotates between the closed position and the open position of the door (D).

Meanwhile, a locking groove 334 is formed in the first coupling hole 333 formed in the center of the cam 331 to prevent slippage between the cam 331 and the camshaft 335 during operation, and the camshaft 335 is formed. ) is formed on the outer peripheral surface of the locking projection 336 to be engaged in the locking groove (334).

In addition, the second coupling hole 337 formed in the center of the camshaft 335 to prevent slippage between the camshaft 335 and the rotation shaft of the door closer 200 during operation has a polygonal cross section, and the door closer 200 ) of the rotation shaft is formed in a shape corresponding to the cross-sectional shape of the second coupling hole (337).

And the friction reducing member 338 is coupled to both ends of the camshaft 335 , respectively, and the friction reducing member 338 is inserted and coupled to the insertion groove 313 formed in the main body 310 . In this embodiment, the friction reducing member 338 includes a bearing, a bush, etc., but is not limited thereto, and is coupled to both ends of the camshaft 335 to reduce frictional force generated according to the rotation of the camshaft 335. Either can be used.

On the other hand, since the main body 310 is composed of the upper body 311 and the lower body 312, the friction reducing member 338 is inserted and coupled to the upper body 311 and the lower body 312 at opposing positions. Grooves 313 are respectively formed.

In addition, a groove 332 is formed on the outer peripheral surface of the cam 331 to provide a closing force generated by the elastic force of the compression spring 356, which will be described later, to the cam 331 .

The groove 332 is formed to become deeper from the outer circumferential surface of the cam 331 as the door D approaches the closed position. When the roller 351 to be described later enters the groove 332 , a closing force generated by the elastic force of the compression spring 356 is provided to the cam 331 .

Specifically, the groove 332 is formed continuously on the first curved surface 332a and the first curved surface 332a formed to correspond to the first position adjacent to the closing position of the door D so as to provide an initial closing force, and is formed in the initial stage. and a second curved surface 332b formed to correspond to a second position adjacent to the closing position of the door D to provide a closing force greater than the closing force.

The first position of the door (D) is from the position where the door (D) is opened from 15° to 16° to the position where the door (D) is opened from 4° to 6°, and the second position of the door (D) is from the position where the door (D) is opened from 4° to 6°. ° from the open position to the 0 ° closed position. Accordingly, the first curved surface 332a is formed on the outer circumferential surface of the cam 331 to correspond to the first position of the door D, and the second curved surface 332b is formed to correspond to the second position of the door D. 331) is formed on the outer peripheral surface.

The first curved surface 332a is continuously formed on the outer circumferential surface of the cam 331 corresponding to the first position of the door D, and has a convex first radius of curvature in the direction of the outer circumferential surface of the cam 331 . have a curved surface. And the second curved surface 332b is continuously formed on the outer circumferential surface of the cam 331 corresponding to the second position of the door D and has a curved surface having a second radius of curvature convex in the outer circumferential direction of the cam 331. . The groove 332 formed on the outer circumferential surface of the cam 331 increases in depth from the first curved surface 332a to the second curved surface 332b, and the second radius of curvature is smaller than the first radius of curvature.

As shown in FIG. 2A, when the door D is rotated from the fully open position to the closed position (the door D rotates until reaching the first position), as shown in FIG. 7, the roller 351 ) does not enter the groove 332 formed on the outer peripheral surface of the cam 331 , so the closing force generated by the elastic force of the compression spring 356 is not provided to the cam 331 , and only the closing force of the door closer 200 is not provided. The door D is rotated.

And when the door D is rotated to reach the first position adjacent to the closed position as shown in FIG. 2B, the roller 351 is formed on the outer peripheral surface of the cam 331 as shown in FIG. 8 ( When entering the starting point P1 of the first curved surface 332a of 332 , an initial closing force is provided to the cam 331 , and in addition to the closing force of the door closer 200 , the door D is rotated in the closed position direction. . Also, as the door D rotates further in the closed position direction, the first curved surface 332a becomes deeper from the outer circumferential surface of the cam 331 , so that the initial closing force provided to the cam 331 becomes larger and larger.

And when the door D is rotated to reach the second position adjacent to the closed position as shown in FIG. 2C, the roller 351 is formed in the outer circumferential surface of the cam 331 as shown in FIG. 9 ( Upon entering the starting point P2 of the second curved surface 332b of 332 , a closing force greater than the initial closing force is provided to the cam 331 , and in addition to the closing force of the door closer 200 , the door D is moved to the closed position. rotate in the direction In particular, since the radius of curvature of the second curved surface 332b is smaller than the first radius of curvature of the first curved surface 332a, the closing force transmitted to the cam 331 after the starting point P2 of the second curved surface 332b is rapidly increased. is increased Also, as the door D rotates further in the closed position direction, the second curved surface 332b becomes deeper from the outer circumferential surface of the cam 331 , so that the closing force provided to the cam 331 increases.

And when the door D is rotated to reach the closed position, that is, as shown in FIG. 10 , the roller 351 rolls along the second curved surface 332b of the groove 332 formed on the outer peripheral surface of the cam 331 . When the movement reaches the closing point P3 on the second curved surface 332b, the closing force generated by the compression spring 356 and the closing force of the door closer 200 are added to allow the door D to be completely closed, to maintain a tight closure. The closing point P3 is a point at which the closing force provided by the elastic force of the compression spring 356 is maximized.

Meanwhile, in the present embodiment, the groove 332 is continuously formed on the second curved surface and further includes a third curved surface 332c having a concave shape toward the center of the cam. The starting point P4 of the third curved surface corresponds to an inflection point of the second curved surface 332b and the third curved surface 332c. In the third curved surface 332c, the roller 351 is located at the initial stage of assembling the closing force assisting device 300, and after assembling the closing force assisting device 300, the arm 210 of the door closer 200 is adjusted. When the door D reaches the closed position, the position of the roller 351 is adjusted to be located at the closing point P3.

The closing force providing unit 350 according to the present embodiment serves to provide the closing force to the cam 330 .

The closing force providing unit 350 includes a roller 351 that is in close contact with the outer circumferential surface of the cam 330 , a roller support 352 coupled to the center of the roller 351 to support the roller 351 , and one end of the roller support It includes a compression spring 356 for elastically supporting the 352, and a power bolt 357 that is in close contact with the other end of the compression spring 356.

The roller 351 is in close contact with the outer circumferential surface of the cam part 330 , specifically, the cam 331 to perform rolling motion. The roller 351 is in close contact with the outer peripheral surface of the cam 331 by the elastic force of the compression spring 356 , and provides a closing force generated by the elastic force of the compression spring 356 to the cam 331 .

And the outer circumferential width W1 of the cam 331 to which the roller 351 is in close contact is formed smaller than the width W2 of the roller 351 . This is to minimize the change in the closing force provided to the cam 331 by the roller 351 even when the outer peripheral surface of the cam 331 is micro-deformed by repeated operations.

The roller support 352 is coupled to the center of the roller 351 to support the roller 351 . The roller support 352 is provided to be seated in the guide slot 314 formed on the inner surface of the main body 310 and reciprocates along the guide slot 314 .

Meanwhile, the guide slot 314 is inclined with respect to the cam 331 . Specifically, the inclination angle θ of the guide slot 314 may be formed to be inclined at 4° to 10° with respect to the cam 331, and preferably, the guide slot 314 is formed to be inclined at 7° with respect to the cam 331. . This is to increase the elastic force of the compression spring 356 transmitted to the cam 331 by the roller 351 to provide a greater closing force to the door closer 200 even when the same compression spring 356 is used. am.

In addition, since the main body 310 is composed of the upper body 311 and the lower body 312, the upper body 311 and the lower body 312 have a unit guide slot provided with the roller support 352 to be seated at a position opposite to that of the upper body 311 and the lower body 312. 314a are respectively formed. When the upper body 311 and the lower body 312 are fastened by the fastening bolts 316 , the unit guide slots 314a are in close contact with each other to form one guide slot 314 .

In addition, since one end of the guide slot 314 opposite to the cam 331 is disposed above the center of the cam 331 , the center of the roller 351 is located above the center of the cam 331 .

The roller support 352 includes a support member 353 connected to one end of a compression spring 356 to be described later and reciprocating along the guide slot 314, and one end is inserted and coupled to the support member 353 and the other end is A pair of support arms 355 disposed opposite to the center of the roller 351, and the other end of the pair of support arms 355 and a pin member 354 penetratingly coupled to the center of the roller 351. do.

In addition, both ends of the pin member 354 are respectively inserted into the guide slot 314 described above to form a long guide groove 315 to guide and limit the reciprocating motion of the support member 353 . Since the main body 310 is composed of an upper body 311 and a lower body 312, guide grooves ( 315) is formed.

Since both ends of the pin member 354 are inserted into the guide groove 315, respectively, when the support member 353 reciprocates along the guide slot 314 by the compression spring 356, the guide groove 315 is supported. It limits the movement distance of the member 353 and also guides the movement of the support member 353 . In addition, since the movement of the support member 353 is limited by the guide groove 315, the movement distance of the roller 351 is also limited.

The compression spring 356 brings the roller 351 into close contact with the outer circumferential surface of the cam 331 and generates a closing force provided to the cam 331 .

The compression spring 356 is provided to be seated in the guide slot 314 formed on the inner surface of the main body 310 . In addition, the other end of the compression spring 356 is supported and fixed by the power bolt 357 , and one end of the compression spring 356 is in close contact with the support member 353 . Accordingly, the compression spring 356 elastically supports the support member 353 so that the roller 351 is in close contact with the outer circumferential surface of the cam 331 .

And the compression spring 356 generates a closing force provided to the cam 331 when the roller 351 moves along the outer peripheral surface of the cam 331 and enters the groove 332 .

The power bolt 357 is in close contact with the other end of the compression spring 356 seated in the guide slot 314 to adjust the elastic force of the compression spring 356 . The power bolt 357 is detachably coupled to the other end of the main body 310 , specifically, the guide slot 314 . The elastic force of the compression spring 356 can be adjusted according to the length at which the end of the power bolt 357 is inserted into the other end of the guide slot 314 .

In addition, a grease injection hole 358 communicating with the guide slot 314 is formed in the power bolt 357 . When it is necessary to apply grease to the support member 353 reciprocating along the guide slot 314, the outer peripheral surface of the roller 351, and the outer peripheral surface of the cam 331, the power bolt 357 is inserted into the guide slot 314. Grease can be injected through the grease injection hole 358 without separating from the .

The closing force assisting device 300 for the door closer 200 according to the present invention configured as described above will be described as follows.

2A and 7 , when the door D is rotated from the open position to the closed position, the closing force assisting device 300 operates the door closer until the door D reaches the first position adjacent to the closed position. (200) does not affect the operation. This is because the compression spring 356 is in a contracted state while the door D is closed, and in this state, the roller 351 is located on the outer peripheral surface having the maximum outer diameter of the cam 331 . Accordingly, the door is rotated only by the closing force of the door closer 200 (see FIG. 12 ).

And referring to FIGS. 2B and 8 , the door D is further rotated to the closed position so that the door D reaches a first position adjacent to the closed position of the door D, and the roller 351 moves the cam 331 Upon entering the starting point P1 of the first curved surface 332a formed on the outer peripheral surface of It is transmitted to the curved surface 332a to provide an initial closing force for rotating the cam 331 . Accordingly, in addition to the closing force of the door closer 200, the closing force for rotating the door D to the closed position is gradually increased (refer to FIG. 12).

And referring to FIGS. 2C and 9 , the door D is further rotated to the closed position of the door D so that the door D reaches a second position adjacent to the closed position, and the roller 351 moves the cam 331 Upon entering the starting point P2 of the second curved surface 332b formed on the outer peripheral surface of ) to rotate the cam 331 with a larger closing force than the initial closing force. This is because when the roller 351 enters the second curved surface 332b from the first curved surface 332a, the depth of the second curved surface 332b is formed to be deeper than the depth of the first curved surface 332a, so the compression spring 356 ) is further expanded as the force pushing the roller 351 increases.

And referring to FIG. 10, when the door D reaches the closed position and the roller 351 reaches the closing point P3 on the second curved surface 332b formed on the outer circumferential surface of the cam, the compression spring 356 is The generated closing force and the closing force of the door closer 200 are added to allow the door D to be completely closed and to maintain a solid closed state (see FIG. 12 ).

Meanwhile, in this embodiment, even when a compression spring 356 having the same elastic modulus is used, the inner surface of the main body 310 is inclined with respect to the cam 331 in order to provide a greater closing force to the door closer 200 . The guide slot 314 is formed, and the roller support 352 and the compression spring 356 are provided to be seated in the guide slot 314 .

The closing force auxiliary device 300 is to overcome the situation in which the door (D) is not closed due to high pressure in the control area in case of fire. The inclination angle θ of the guide slot 314 should be selected so that the closing force for pushing the door D at the closed position of is maximized.

11 and 12, when the center of the roller 351 is located above the center of the cam 331 and the guide slot 314 is formed to be inclined, it is transmitted to the cam 331 at the closed position of the door D The increase in the closing force will be explained. First, in a state in which the roller 351 is in close contact with the second curved surface 332b of the cam 331 corresponding to the closed position of the door D, the tangent angle between the roller 351 and the cam 331 is θ ₀ (°) ) and the inclination angle of the guide slot 314 with respect to the cam 331 is referred to as θ (°). And the force that the compression spring 356 pushes the roller 351 by the elastic force is referred to as F ₀ .

At this time, when the guide slot 314 is disposed horizontally with respect to the cam 331 , the force that the roller 351 pushes the cam 331 by the elastic force of the compression spring 356 is F ₁ =F ₀ cos(θ). ₀ ). On the other hand, when the guide slot 314 is formed to be inclined by θ (°) with respect to the cam 331, the force that the roller 351 pushes the cam 331 by the elastic force of the compression spring 356 is F ₂ =F ₀ cos (θ ₀ -θ). As such, when the guide slot 314 is formed to be inclined, the force of the roller 351 pushing the cam 331 is greater (F ₂ >F ₁ ).

As such, in this embodiment, even when a compression spring 356 having the same elastic modulus is used, the guide slot 314 is formed inclined on the inner surface of the main body 310 to provide a larger closing force to the door closer 200 . do.

For example, in case of a fire, a high closing force is required to overcome the high pressure in the containment area and to close the door (D). 12, when the guide slot 314 is horizontally disposed with respect to the cam 331 and the closing force is 62N at the closing position of the door D, even when the same compression spring 356 is used When the guide slot 314 is formed to be inclined at 7° with respect to the cam 331 , the closing force is increased to 75N at the closed position of the door D, thereby securing a stable closing force under the same conditions. Here, the inclination angle θ of the guide slot 314 is in the range of 4° to 10°.

When the inclination angle θ of the guide slot 314 exceeds 10°, the size of the main body 310 may increase as the inclination of the guide slot 314 becomes too large. In addition, when the inclination angle θ of the guide slot 314 is less than 4°, the elastic force of the compression spring 356 must be increased to obtain a stable closing force, so the compression spring 356 having a large elastic modulus must be used.

As such, the present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Accordingly, it should be said that such modifications or variations are included in the claims of the present invention.

100: control unit for automatic closing device 200: door closer
300: closing force auxiliary device for door closer 310: body part
313: insertion groove 314: guide slot
315: guide groove 316: fastening bolt
330: cam unit 331: cam
332: groove 332a: first curved surface
332b: second curved surface 332c: third curved surface
335: camshaft 338: friction reducing member
350: closing force providing unit 351: roller
352: roller support 353: support member
354: pin member 355: support arm
356: compression spring 357: power bolt
358: grease injection hole

Claims (8)

a body portion disposed adjacent to the door closer;
a cam part rotatably provided inside the body part, having a groove, connected to a rotation shaft of the door closer rotating between a closed position and an open position of the door to transmit a closing force to the door closer; And
Provided within the body portion to provide a closing force to the cam portion, the roller provided in close contact with the outer circumferential surface of the cam portion, and the inner surface of the body portion reciprocating along a guide slot formed to be inclined with respect to the cam portion and coupled to the center of the roller A roller support part for supporting the roller and one end provided in the guide slot to elastically support the roller support part, and when the roller moves along the outer circumferential surface of the cam part and enters the groove, a closing force is provided to the cam part It includes a closing force providing unit having a compression spring,
The cam part,
a cam in which the roller is in close contact with an outer circumferential surface and the groove is formed on the outer circumferential surface;
a cam shaft coupled to a central portion of the cam and connected to a rotation shaft of the door closer; and
and friction reducing members respectively coupled to both ends of the camshaft,
The groove is formed to become deeper from the outer circumferential surface of the cam toward the closing position of the door,
The groove is
It is formed on the outer circumferential surface of the cam corresponding to the first position adjacent to the closing position of the door, has a convex first radius of curvature in the direction of the outer circumferential surface of the cam, and provides an initial closing force to the cam when the roller enters a first curved surface to and
It is formed on the outer peripheral surface of the cam corresponding to the second position adjacent to the closing position of the door, is formed continuously on the first curved surface and has a second radius of curvature convex in the direction of the outer peripheral surface of the cam, when the roller enters to include a second curved surface that provides a larger closing force than the initial closing force,
the first position is from a position where the door is opened from 15° to 16° to a position from which the door is opened to 4° to 6°, and the second position is from a position where the door is opened from 4° to 6° to a closed position of 0°;
A closing force assisting device for a door closer that is deeper in depth from the first curved surface to the second curved surface, and the second radius of curvature is smaller than the first radius of curvature.
According to claim 1,
The center of the roller is located above the center of the cam,
The guide slot is a closing force auxiliary device for a door closer that is formed to be inclined by 4° to 10° with respect to the cam.
According to claim 1,
The closing force providing unit,
Further comprising a power bolt detachably coupled to the guide slot and in close contact with the other end of the compression spring to adjust the elastic force of the compression spring,
A closing force auxiliary device for a door closer in which a grease injection hole communicating with the guide slot is formed in the power bolt.
According to claim 1,
A closing force assisting device for a door closer, wherein the width of the outer circumferential surface of the cam to which the roller is in close contact is smaller than the width of the roller.
According to claim 1,
The roller support part,
a support member connected to one end of the compression spring and reciprocating along the guide slot;
a pair of support arms having one end coupled to the support member and the other end disposed opposite to the center of the roller; and
A closing force assisting device for a door closer comprising a pin member penetratingly coupled to the other end of the pair of support arms and the center of the roller.
6. The method of claim 5,
Both ends of the pin member are inserted into the guide slot, respectively, and guide grooves for guiding and limiting the reciprocating motion of the support member are long formed. delete delete

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