KR20190004251A - Grating with smell interception function - Google Patents

Abstract

To achieve the purpose of the present invention, the present invention provides a grating for covering a sewer, wherein the grating comprises an outer frame provided in a sewer, inner frames which are installed at a predetermined interval inside the outer frame to form a sewer inlet, and an opening and closing plate which is rotated to open and close the sewer inlet. In the grating, a rotation axis is inserted into an insertion hole formed in a longitudinal direction at the other side of the opening and closing plate in the width direction. The outer frame includes a connection hole into which a rotary shaft of the opening and closing plate is inserted to couple the opening and closing plate. At least one elastic means is provided, and the opening and closing plate is rotated by at least 60 degrees or greater downward by the weight of sewage introduced into the sewage inlet. According to the present invention, the opening and closing plate is rotated and returned by the elastic force of the elastic means to block the sewage inlet.

Description

{Grating with smell interception function}

The present invention relates to a grating, and more particularly, to an apparatus and method for grilling, more particularly, an apparatus and a method for grilling the grill, And when the wastewater flows into the wastewater inlet as in the case of rainfall, the wastewater inlet is opened by the weight of the wastewater to smooth the drainage.

Further, the present invention relates to a grating having a backflow preventing structure capable of withstanding the water pressure of sewage flowing backward in the case of a low-lying zone.

Generally, a drainage channel is installed in the underground along the edge of the road so that sewage such as rainwater on the road can be smoothly flowed into the river, and drainage pipes for introducing sewage to the upper side of the drainage channel are installed at intervals. Ensure that rainwater does not accumulate on the road and is discharged smoothly.

As described above, most of the sewer installed on the road is provided with a sewer lid formed by molding a grating or a concrete made by welding or casting iron in a lattice shape to prevent the pedestrian from falling into the sewer, and a plurality of sewage inlets So that sewage can flow smoothly into the drainage channel.

However, the sewer lid made of the above-mentioned grating or concrete is usually constructed so that the inside of the sewer can be seen through the inlet of the sewer lid, and relatively large sized waste or dirt is filtered by the sewer lid But small sized cigarette butts and scraps of debris can easily flow into the sewer inlet through the sewer inlet of the sewer lid and accumulate under the sewer.

When the amount of accumulated dirt in the sewer increases repeatedly due to the repeated inflow of various kinds of dirt, the drainage path connected to the inside of the sewage is blocked, and when the inflow amount of the sewage increases, the drainage is not smooth and the sewage flows back to the outside .

In order to solve such a problem, a Registration Practical Utility Model No. 20-0475383 (registered date: November 21, 2014) has been proposed. However, the above-mentioned prior art is disadvantageous in that the grating formed on the upper part of the sewer, And an opening and closing plate is provided to open or close the inlet so that the sewage inlet is kept closed by the opening and closing plate in the normal state to prevent the entry of dirt into the inside of the sewer while blocking the odor generated from the inside of the sewer, When the sewage flows into the sewage inlet, the sewage inlet is opened by the weight of the sewage to smooth the drainage.

However, as shown in FIG. 1, when the opening / closing plate 30 is resiliently supported by the leaf spring 40 so that the opening / closing angle of the opening / closing plate 30 is as small as 45 deg. To 60 deg. There is a problem that the drainage is not smooth, and when the drainage amount is large, the elastic force of the leaf spring 40 is lost due to excessive opening and closing, or the opening and closing plate 30 is damaged.

In addition, the open / close plate 30 has insufficient response force against the backwash water pressure, so that there is a limitation in installing the backwash water at the reverse flow pressure due to the water quantity in the case of the low water level.

A space is formed between the opening and closing plate 30 and the bearing bar 50 or the outer frame 10 when the opening and closing plate 30 is opened and closed so that the foreign substance is caught and the door 30 is rotated due to the malfunction of the opening and closing plate 30 There is a problem that can not be avoided.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a sewage treatment apparatus which comprises at least one resilient means and is rotated by 60 degrees or more downwardly by the weight of sewage introduced into a sewage inlet, And an object of the present invention is to provide a grating having an odor blocking function for preventing malfunction of the opening / closing plate due to a gap formed between the opening and closing plate and the inner and outer frame, .

Another object of the present invention is to provide a grating provided with a reinforcing bracket and having an odor-blocking function for preventing the rotation shaft from being warped due to a long length of the opening and closing plate.

However, the object of the present invention is not limited to the above-mentioned object, and another object which is not mentioned can be understood by those skilled in the art from the following description.

In order to accomplish the above object, the present invention provides a sewage disposal system comprising: an outer frame disposed in a sewer; an inner frame spaced apart from the outer frame by a predetermined distance to form a sewage inlet; A grating for covering a sewer including an open / close plate, wherein the grating has a rotation axis inserted into an insertion hole formed in a longitudinal direction on the other side in the width direction of the open / close plate, and the open / The opening and closing plate is rotated downward by 60 degrees by the weight of the sewage introduced into the sewage inlet, and the opening / closing plate is rotated and restored by the elastic force of the elastic means. And the sewage inlet is cut off. The.

The elastic means may include a coil spring or a leaf spring inside the outer frame, or both the coil spring and the leaf spring. The elastic means may support the opening and closing plate to block the sewage inlet, And the opening / closing angle is rotated by 60 DEG or more when the open / close plate is rotated downward by the weight of the sewage flowing into the sewage inlet.

In addition, at least one plate spring for elastically supporting the opening / closing plate is provided on the inner side surface of the outer frame or the inner frame to support the opening / closing plate to shut off the sewage inlet. Due to the weight of the sewage introduced into the sewage inlet And the opening / closing angle is rotated by 60 DEG or more when the opening / closing plate is rotated downward.

One end of the leaf spring is in close contact with the bottom surface of the opening and closing plate and the other end is coupled to the inner and outer frame through an elastic opening formed in the inner and outer frames. / RTI >

In addition, the leaf spring has a bent portion whose center portion is bent in the longitudinal direction, and the bent portion includes a first bent portion and a second bent portion having different curvature radii and bent directions.

In addition, the thickness of the leaf spring is formed thicker than the both end portions of the leaf spring for reducing the elastic stress in the central portion in the longitudinal direction where the elastic stress is concentrated, thereby improving the durability of the leaf spring.

In addition, at both ends of the rotating shaft, coil springs for rotating shafts, which are elastic means for elastically supporting the opening / closing plate, are respectively provided. When the opening / closing plate rotates downward due to the weight of the sewage introduced into the sewage inlet, Deg. Or more. ≪ / RTI >

The rotation shaft is inserted into the rotation shaft coil spring, one end of the rotation shaft coil spring is engaged with the rotation shaft, and the other end is coupled to the inside of the longitudinal side surface of the outer frame. / RTI >

The rotation axis of the opening / closing plate is protruded through the connection hole of the outer frame, the rotation axis is inserted into the inside of the rotation axis coil spring, one end of the rotation axis coil spring is engaged with the rotation axis, Is coupled to the outside of the longitudinal side surface of the outer frame.

A plurality of coil springs for the opening and closing plate as the elastic means are provided so that one end thereof is in contact with the lower surface of the opening and closing plate and the other end thereof is in contact with or fixed to the inner surface of the outer frame and the inner frame, And when the open / close plate is rotated downward by the weight of the sewage, the opening / closing angle is rotated at 60 degrees or more.

Further, a bracket coupling means is formed on the inner side of the outer frame or the inner frame, and a reinforcing bracket coupled to the rotation shaft is provided on the bracket coupling means to support and rotate the opening / closing plate .

The reinforcement bracket may include a head portion having an insertion port into which the rotation shaft is inserted and a root portion extending from the head portion to one side and inserted into the bracket coupling hole, There is provided a grating in which an insertion groove is formed to insert a head portion.

The roots are provided with threaded roots for forming threads, and screw holes are formed in the bracket coupling holes so that the reinforcing brackets are screwed to the outer frame or the inner frame. .

Further, the bracket coupling means penetrates to insert the root portion, and the reinforcing bracket is composed of an elastic body and is provided with a split type root portion which is opened, and the divided root portions are contacted by an external force and inserted into the bracket coupling hole And a reinforcing bracket is provided on the outer frame or the inner frame so that the reinforcing bracket is provided on the inner frame of the outer frame or the inner frame on one side of the divided roots.

In addition, the connection hole and the insertion hole are formed in a circular shape with the fixed rotation of the rotation shaft being formed as a long oval long hole in the vertical direction for upward and downward flow rotation of the opening and closing plate.

Further, a sealing plate is attached to the lower surface of the protruding jaw on the side of the outer frame or the inner frame to seal the gap between the opening and closing plate and the inner and outer frames.

In addition, the upper end of the outer frame is formed with an outer frame side protruding protrusion protruding inwardly of the outer frame, and the inner frame has a T-shaped cross section and an inner frame side protruding protrusion Wherein the opening and closing plate is provided at the lower side of the protruding jaws on the outer frame side and the inner frame side to block the smell of the sewer and to block the reverse flow of the sewage.

Further, a grating is provided on the upper surface of the opening / closing plate, wherein a billboard for advertisement and advertising is printed.

The features and advantages of the present invention will become more apparent from the following detailed description based on the accompanying drawings.

Prior to that, terms and words used in the present specification and claims should not be construed in a conventional and dictionary sense, and the inventor may properly define the concept of the term in order to best explain its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

As described above, according to the present invention, when the opening and closing plate rotates downward, the opening and closing angle is rotated to 60 degrees or more to smooth the drainage, and a sealing plate is provided between the opening and closing plate and the inner and outer frames, There is an effect that it is possible to prevent malfunction of the open / close plate.

Further, since the reinforcing bracket is provided, it is possible to prevent warpage of the opening and closing plate and the rotating shaft due to the external force.

1 is an exploded perspective view of a conventional grating,
2 is a perspective view of a grating according to the present invention,
3 is a view showing the coupling of the leaf spring according to the present invention,
FIG. 4 is a state diagram showing a coupled state of the grating according to the present invention,
5 is a side view of the leaf spring according to the present invention,
FIG. 6 is a sectional view of a grating in the absence of sewage inflow according to a preferred embodiment of the present invention, FIG.
FIG. 7 is a sectional view of a grating in the case of sewage inflow according to a preferred embodiment of the present invention, FIG.
8 is a view showing a coupling of a grating to which a coil spring for a rotary shaft according to the present invention is coupled,
FIG. 9 is an enlarged view of the 'A' portion of FIG. 8,
10 is a view of the coupling of the grating according to the present invention,
11 is a cross-sectional view of a grating having a support reinforcement tuck according to the present invention,
12 is a bottom perspective view of an opening / closing plate having a plurality of coil springs for an opening / closing plate according to the present invention,
13 is a sectional view of a grating provided with a reinforcing bracket according to the present invention,
FIG. 14 is a combined view of a grating in which a coil spring for a rotating shaft and a leaf spring according to the present invention are combined.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation.

In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

In addition, the following embodiments are not intended to limit the scope of the present invention, but merely as exemplifications of the constituent elements set forth in the claims of the present invention, and are included in technical ideas throughout the specification of the present invention, Embodiments that include components replaceable as equivalents in the elements may be included within the scope of the present invention.

FIG. 4 is a state view showing a combined state of the grating according to the present invention. FIG. 5 is a plan view of the grating according to the present invention. FIG. Fig. 7 is a sectional view of the grating in the case where sewage inflow is present according to a preferred embodiment of the present invention. Fig. 8 is a side view of the spring according to the preferred embodiment of the present invention. Fig. 9 is an enlarged view of a portion 'A' in FIG. 8, FIG. 10 is a view showing a coupling of a grating according to the present invention, and FIG. 11 is a cross- FIG. 13 is a sectional view of a grating provided with a reinforcing bracket according to the present invention, FIG. 14 is a cross-sectional view of the grating with the reinforcing bracket according to the present invention, FIG. FIG. 5 is a combined view of a grating in which a coil spring for a rotating shaft and a leaf spring according to the present invention are combined.

The grating 200 according to the present invention may have various shapes such as a square, a circle, a trapezoid, and a rhombus. In one embodiment of the present invention, a grating 200 having a rectangular shape out of various shapes is shown in the drawing Explain.

2, the grating 200 covers an upper portion of the sewer installed to discharge the sewage to the edge of the road, and includes an outer frame 210 formed in a shape that can be seated on the sewer so as to be disposed in the sewer, An inner frame 220 spaced at a predetermined distance from the inner side of the outer frame 210 to form a sewage inlet, and an open / close plate 230 rotated to close the sewage inlet.

That is, in the grating 200, the rotation shaft 231 is inserted into the insertion hole formed in the longitudinal direction on the other side in the width direction of the opening / closing plate 230, and the opening / closing plate A connection hole 213 into which the rotary shaft 231 of the first and second rotary shafts 230 is inserted is formed.

In addition, at least one elastic means is provided to rotate the opening / closing plate 230 downward by 60 degrees due to the weight of the sewage introduced into the sewage inlet, and the opening and closing plate 230 is rotated and restored by the elastic force of the elastic means And the sewage inlet is blocked.

At this time, the upper end of the outer frame 210 is formed with an outer frame side protrusion 212 protruding inward of the outer frame 210. The inner frame 220 has a T- An inner frame side protruding protrusion 221 protruding from both sides can be formed.

Therefore, the opening / closing plate 230 is provided on the lower side of the protruding protrusions 212 and 221 on the outer frame side and the inner frame side to block the smell of the sewer and to prevent the reverse flow of the sewage.

In addition, the opening / closing plate 230 is hooked by the protrusions 212 and 221 of the outer frame side or the inner frame side to limit the maximum upward turning distance.

Therefore, it is possible to prevent backflow by the protruding jaws 212 and 221.

A sealing plate 260 is attached to the lower surface of the protrusions 212 and 221 on the outer frame side or the inner frame side to seal the gap between the opening and closing plate and the inner and outer frames 220 and 210.

At this time, the sealing plate 260 is made of an elastic member such as rubber.

Therefore, a sealing plate 260 is provided between the opening / closing plate 230 and the inner and outer frames 220 and 210 to prevent foreign matter and dirt from being caught in the gap, thereby preventing the opening and closing plate 230 from malfunctioning and grating Can be prevented.

The base elastic means may include a coil spring 280 or a leaf spring 250 inside the outer frame 210 or may include both the coil spring 280 and the leaf spring 250.

Therefore, the opening and closing plate 230 is supported by the elastic means to shut off the sewage inlet, and when the opening and closing plate 230 is rotated downward by the weight of the sewage introduced into the sewage inlet, .

That is, when the open / close board 230 rotates downward, it is opened at 90 degrees.

On the other hand, an elastic sphere 240 is formed on the inner side of the outer frame 210 or the inner frame 220.

At this time, a leaf spring 250 for elastically supporting the opening / closing plate 230 is provided in the elastic sphere 240. The opening / closing plate 230 is pivoted downward by the weight of sewage introduced into the sewage inlet, When there is no sewage inflow, the open / close plate 230 is supported to shut off the sewage inlet.

The thickness of the leaf spring 250 may be thicker than both ends of the leaf spring 250 where the elastic stress is reduced in the central portion in the longitudinal direction where the elastic stress is concentrated to improve the durability of the leaf spring 250 .

One end D of the leaf spring 250 is fluidly or tightly coupled to the bottom surface of the opening and closing plate 230 and the other end A passes through the elastic sphere 240, (210, 220).

The leaf spring 250 has a bent portion 251 whose central portion is bent in the longitudinal direction. The bent portion 251 has a first bent portion B having a different radius of curvature and a second bent portion (C).

That is, the bent portion 251 is bent in an S shape.

The first bent portion B of the bent portion 251 is extended from the other end portion A of the leaf spring 250 and protrudes to the outside of the leaf spring 250, Is extended from the first bent portion B and is connected to one end portion D of the leaf spring 250 and protrudes to the upper side of the leaf spring 250.

The plate spring 250 may be coupled by an engagement pin, or may be coupled using a bracket as shown in FIGS.

The plate spring 250 has an S-shaped bent portion 251 and the other end A of the leaf spring 250 supports the opening and closing plate 230 in the outer frame 210, And one end D of the leaf spring 250 penetrates through the elastic sphere 240 to be fluidly engaged with or in close contact with the bottom surface of the opening / closing plate 230.

Therefore, when the plate spring 250 is bent as the opening / closing plate 230 is pivoted downward by the bent portion 251, the bent portion 251 is bent in different directions A restoring force is formed and the restoring force of the leaf spring can be improved.

Also, when the leaf spring 250 is bent, a clearance is generated by the bent portion 251, so that the leaf spring 250 can be folded by 90 degrees.

The thickness of the first bent portion B which is most affected by the bending stress is greater than the thickness of the second bent portion C and one end D and the other end A of the leaf spring 250, It is preferable that efficient dispersion of the ink droplets is achieved.

The resilient sphere 240 may be formed with a through-hole having an area that allows the leaf spring 250 to pass therethrough so that the outer sphere contacting the leaf spring 250, It is preferable to form a curved line according to the rotation of the leaf spring 250.

8 to 11, a connection hole 213 is formed in the outer frame 210 so that the rotation axis 231 of the opening / closing plate 230 is inserted into the outer frame 210 so that the opening / closing plate 230 is coupled.

At this time, the connection holes 213 are provided on opposite sides of the longitudinal direction of the outer frame 210 so as to face each other.

In addition, the connection hole 213 may be formed in a circular shape depending on the purpose, or may be formed as a long oval long hole in the vertical direction as shown in FIG.

When the connection hole 213 is formed in a circular shape, the rotation shaft 231 is fixed and rotated to rotate the opening and closing plate. When the connection hole 213 is formed as a long hole, the rotation shaft 231 can move up and down.

That is, when the airtightness of the opening / closing plate 230 needs to be increased according to the backflow pressure, the opening / closing plate 230 can be moved and the airtightness can be improved by forming the connection hole 213 as a long hole.

In addition, coil springs 280-1 for rotating shafts, which are elastic means for elastically supporting the opening / closing plate 230, are provided at both ends of the rotating shaft 231, When the opening / closing plate rotates downward, the opening / closing angle is rotated by 60 degrees or more.

That is, the rotation shaft 231 is inserted into the rotation shaft coil spring 280-1, one end of the rotation shaft coil spring 280-1 is coupled to the rotation shaft 231, And is coupled to the inside of the outer frame 210.

The rotation shaft 231 of the opening and closing plate 230 may protrude through the connection hole 213 of the outer frame 210 so that the inner side of the coil spring 280-1 One end of the coil spring 280-1 for rotation is coupled to the rotation shaft 231 and the other end of the coil spring 280-1 is coupled to the outside of the longitudinal side of the outer frame 210 .

At this time, the rotation shaft 231 is coupled to the open / close board 230 so that the open / close board 230 and the rotation shaft 231 are rotated together.

The grating 200 is provided with a reinforcing bar 290 located at an upper portion of the opening and closing plate 230 so as to be spaced apart from the grating 200 in a direction intersecting the inner frame 220, To protect the grating 200.

In addition, a seating groove 202 is formed at the upper ends of the outer and inner frames 210 and 220 so as to face each other in the width direction, and the reinforcing bar 290 is seated and fixed to the seating groove .

Therefore, when the sewage flows backward, the opening / closing plate 230 can be supported to improve the sealing effect.

A support reinforcement step 201 for preventing warpage of the opening / closing plate 230 by external pressure is formed on an inner side surface of the outer frame 210 and the inner frame 210. [

Further, even when the open / close board 230 is long, the support reinforcement step 201 may be provided.

That is, the support reinforcement step 201 protrudes from the inner side of the outer frame 210 and 220 and supports the opening / closing plate 230.

A reinforcing jaw insertion groove 233 is formed in the opening and closing plate 230 at a position corresponding to the supporting reinforcing jaw 201 for the rotation of the opening and closing plate 230. When the opening and closing plate 230 rotates downward , And the support reinforcement step 201 is inserted into the reinforcement jaw insertion groove 233.

A lid fitting part 214 extending in the longitudinal direction of the outer frame 210 is formed and a lid frame 270 covering the spring device part where the lid rotating shaft 231 and the spring 280 are engaged can be coupled .

The cover frame 270 may be joined by welding.

Therefore, it is possible to prevent the spring device unit from being damaged due to foreign matter being caught in the spring 280 and protecting the spring device unit.

12 to 13, one end of the coil spring 280-2 for the opening / closing plate as the elastic means is in contact with the lower surface of the opening / closing plate 230, and the other end of the coil spring 280-2 is in contact with the outer frame, 210 and 220 so that the opening and closing angles are rotated by 60 degrees or more when the opening and closing plate is rotated downward by the weight of the sewage flowing into the sewage inlet, .

At this time, it is preferable that the coil spring 280-2 for the opening / closing plate is provided as a torsion spring.

The rotation shaft 231 is not engaged with the opening / closing plate 230, so that only the opening / closing plate 230 is rotated.

A bracket coupling hole 240 is formed on an inner surface of the outer frame 210 or the inner frame 200. A reinforcing bracket 250 coupled to the rotation shaft 231 is formed on the bracket coupling hole 240, And supports the open / close board 230.

The reinforcing bracket 250 includes a head portion 251 formed with an insertion port 252 through which the rotation shaft 231 is inserted and a bracket coupling portion 240 extending from the head portion 251 to one side, And a root portion to be inserted.

A plurality of insertion grooves 234 are formed on the lower surface of the opening / closing plate 230 so as to be symmetrical with respect to the insertion direction of the head 251.

In addition, the insertion port 252 is preferably formed as a long elliptical long hole in the vertical direction, so that the opening / closing plate 230 can move up and down.

That is, when sewage flows backward, the opening / closing plate 230 is moved upward to improve the hermeticity.

A threaded groove is formed in the bracket coupling hole 240 so that the reinforcing bracket 250 is engaged with the inner side surface of the outer frame or the inner frame, As shown in FIG.

Meanwhile, the bracket coupling hole 240 may be formed to pass therethrough, and the root portion is inserted into the through-hole bracket coupling hole 240.

At this time, the reinforcing bracket 250 is formed of an elastic body and is provided with a split type root portion 253, and the divided root portion 253 is contacted by an external force and inserted into the bracket binding hole 240 And a locking part 254 is formed at one side of the divided root part 253 so as to be caught by the inner side surfaces of the outer frame 210 or the inner frame 220.

That is, the reinforcement bracket 250 is formed of an elastic body, and the split root 253 is divided into two fins so as to be opened.

Accordingly, the two pins are brought into contact with each other by an external force and inserted into the bracket coupling hole 240, the two pins are returned to the original state, and the outer frame 210 or the inner frame 220 is connected to one side of the two pins. The reinforcing bracket 250 is provided on the outer frame or the inner frame.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the same is by way of illustration and example only and is not to be construed as limiting the present invention. It is obvious that the modification or improvement is possible.

It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

200: grating 210: outer frame
211: Retaining jaw 212: Outer frame side protruding jaw
213: connection hole 220: inner frame
221: inner frame side protrusion 230: opening / closing plate
231: rotation axis 232:
240: elastic bulb 250: leaf spring
251: bent portion 260: sealing plate
S: Sewage

Claims (6)

An outer frame provided in the sewer, an inner frame spaced apart from the inner frame by a predetermined distance to form a sewage inlet, and an open / close plate rotated to open and close the sewage inlet, In the grating,
In the grating,
A rotation shaft is inserted into the insertion hole formed in the longitudinal direction on the other side in the width direction of the opening / closing plate, and a connection hole is formed in the outer frame for inserting the rotation axis of the opening / closing plate,
Characterized in that at least one elastic means is provided so that the opening and closing plate is rotated downward by 60 DEG or more by the weight of the sewage introduced into the sewage inlet and the opening and closing plate is rotated and restored by the elastic force of the elastic means to block the sewage inlet. Grating.
The method according to claim 1,
Wherein the elastic means comprises a coil spring or a leaf spring inside the outer frame, or both the coil spring and the leaf spring,
Wherein the opening and closing plate is supported by the elastic means to cut off the sewage inlet, and when the opening and closing plate rotates downward by the weight of the sewage flowing into the sewage inlet, the opening and closing angle is rotated by 60 degrees or more Grating.
3. The method of claim 2,
One end of the leaf spring is in close contact with the bottom surface of the opening and closing plate and the other end is coupled to the inner and outer frame through an elastic opening formed in the inner and outer frames,
3. The method of claim 2,
A plurality of coil springs for the opening and closing plate as the elastic means are provided so that one end thereof is in contact with the lower surface of the opening and closing plate and the other end thereof is in contact with or fixed to the inner surface of the outer frame and the inner frame, Wherein the opening / closing angle is rotated by 60 DEG or more when the opening / closing plate is rotated downward by the weight of the opening / closing plate.
The method according to claim 1,
Wherein a bracket coupling means is formed on an inner side surface of the outer frame or the inner frame and a reinforcing bracket coupled to the rotation shaft is provided on the bracket coupling means to support and rotate the opening and closing plate.
6. The method of claim 5,
The reinforcing bracket includes a head portion having an insertion port into which the rotation shaft is inserted,
And a root portion extending from the head portion to one side and inserted into the bracket coupling hole.

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