KR101565885B1 - electric cooker - Google Patents

Abstract

Provided is an electric cooker. The electric cooker according to the present invention includes a detachable inner pot lid disposed on the bottom surface of a lid to cover the inner pot and to improve convenience when detaching the inner pot lid. The electric cooker comprises: a main body which includes an inner pot in which food is accommodated inside; a lid which is mounted to an upper portion of the main body, and opened and closed; a control plate which is disposed on the bottom surface of the lid, and includes an operating means corresponding to pressure, which is operated according to the height of the inner space pressure of the inner pot, and in which a holder bracket is coupled to one portion thereof; an oven cover which seals an upper portion of the inner pot, and in which a through hole for the holder bracket to be passed through is formed to be detachably coupled to the lower side of the control plate; and a cover holder which has a hollow shape to form a screw hole unit, coupled to a screw unit of the holder bracket which is exposed by passing through the through hole, and which is turned to be coupled to the edge of the through hole while being restrained by the same.

Description

Electric cooker {electric cooker}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric cooker, and more particularly, to an electric cooker having an inner pot cover provided on a lower surface of a lid for covering an inner pot.

2. Description of the Related Art Generally, an electric cooker is a device for cooking food, and comprises a main body having an inner pot in which food is received, and a lid covering the upper portion of the main body.

Here, the electric cooker heats the inner pot containing the food to make the state of the high temperature and high pressure, and cooks the food. At this time, sealing the inner pot is effective in preventing the heat from being released from the inner pot and keeping the high temperature, so that the cooking is efficiently performed and the temperature is kept constant even when warming. To this end, a lid is provided to cover the top of the main body.

Hereinafter, a conventional electric cooker will be described with reference to the accompanying drawings.

1 is a partially exploded perspective view showing a conventional electric cooker.

1, a conventional electric cooker 100 includes a lid (not shown) coupled to an upper portion of a body (not shown) and a lid (not shown) And an oven cover 20 detachably provided to cover an upper portion of the oven cover. An inner pot packing 21 for sealing the upper end of the inner pot (not shown) is attached to the rim of the oven cover 20.

The cover (not shown) is provided with a coupling hole 60 for coupling the oven cover 20, and a cover holder 70 may be coupled to the coupling hole 60.

At this time, a through hole 22 is formed in the inside of the oven cover 20, and the oven cover 20 is disposed between the cover holder 70 and the coupling hole 60, The oven cover 20 can be detached from the bottom portion of the lid 10 as the oval cover 70 and the coupling hole 60 are mutually coupled and separated through the through hole 22. [

However, in the related art, when the oven cover 20 is separated for cleaning or the like, the cover holder 70 is separated from the oven cover 20 and must be stored separately. Further, when the cover holder 70 is lost, the oven cover 20 can not be fixed to the lid (not shown), so that it is impossible to use basic functions such as cooking or keeping warm.

In addition, it is difficult to check the fixing state of the cover holder 70, and if the cover holder 70 is not completely engaged, the inner pot (not shown) may not be sealed properly, .

The cover holder 70 is directly exposed to high-temperature steam. The cover holder 70 is made of stainless steel or aluminum or has a coating for preventing corrosion on the outside thereof. The inside of the inner pot (not shown) Functional coatings such as diamond, gold, and copper are provided to prevent and improve the cooking quality.

However, when the cover holder 70 is not fully engaged, the cover 10 is often opened and closed, and the cover holder 70 falls into the inner pot (not shown) The inner pot (not shown) is easily damaged.

In order to prevent the cover holder 70 from being loosened, a coupling wing portion 61 having a wing shape is provided in the coupling hole 60. In order to fix the oven cover 20, The oven cover 70 must be inserted and rotated in accordance with the direction of the coupling vane 61, so that the oven cover 70 is very troublesome to separate and join.

Korean Patent Laid-Open No. 10-2009-0108750

In order to solve the above problems, the present invention provides an electric cooker having an inner pot cover provided on a lower surface of a lid for covering an inner pot, which is detachable and improved in convenience of removal.

According to an aspect of the present invention, there is provided a cooking apparatus comprising: a main body having an inner pot in which food is received; A lid coupled to an upper portion of the main body to be opened and closed; A control plate provided on a lower surface of the lid and provided with a pressure corresponding operation means operated according to a height of the inner pot internal space pressure and having a holder bracket coupled to one side; An oven cover for sealing the upper portion of the inner pot, wherein the oven cover is formed with a through hole through which the holder bracket penetrates and is detachably attached to the lower side of the control plate; And a cover holder which is provided in a hollow shape so as to form a threaded hole portion to be fastened to the threaded portion of the holder bracket exposed through the through hole and is coupled to rotate around the rim of the through hole, do.

The cover holder may include an engaging portion that engages with one side of the rim of the through hole and an insertion portion formed through the through hole and formed with a detent groove to be inserted into the upper portion and coupled with the detent ring, The edges of the through holes are constrained.

The cover holder includes a latching portion which is engaged with one side of the rim of the through hole and an insertion portion which is inserted into the upper portion through the through hole. The end portion of the insertion portion is inserted into the through- It is preferable that a locking protrusion protruding radially outward is formed.

At this time, it is preferable that the locking protrusion is formed to extend along the end portion of the insertion portion and to bend outward in the radial direction.

The outer circumference of the holder bracket is formed with a fixing groove to which a loosening preventing ring is coupled, and the inner circumference of the hollow portion of the cover holder is formed to selectively friction with the loosening preventing ring.

Preferably, the inner circumference of the hollow portion of the cover holder is formed with a pressing step that is narrowed from the top to the bottom so that the friction force of the loosening prevention ring increases as the threaded portion and the screw hole are coupled with each other.

At this time, it is preferable that the threaded portion is provided at a depth equal to or greater than the depth of the threaded hole portion so that an end of the threaded portion when the cover holder and the holder bracket are engaged with each other passes through the threaded hole portion.

Preferably, the hollow portion of the cover holder is formed with a stopper step along an upper edge of the screw hole so that the stopper protrusion protruding from the outer periphery of the holder bracket is caught.

The upper surface of the stopper protruding portion may be provided with a packing groove portion through which a hermetic packing is inserted.

Furthermore, it is preferable that one of the cut portion and the concave / convex portion is formed on the outer periphery of the lower end of the cover holder to grasp the user.

Through the above solution, the electric cooker of the present invention provides the following effects.

First, since the cover holder is constrained to rotate on the rim of the through-hole of the oven cover, the cover holder can not be separated from the oven cover when the oven cover is detached, so that there is no risk of loss of the oven cover. If the cover holder is rotated, the oven cover can be detached and the usability of the product can be improved.

Secondly, since the cover holder is restrained by the edge of the through hole when the detent ring is coupled to the outer periphery of the upper part inserted into the through hole of the oven cover, damage such as scratching or peeling of the inner pot, which may occur when the cover holder falls into the inner pot, So that the deterioration of the cooking quality due to the damage of the inner pot can be prevented, and the satisfaction of the user can be improved.

Thirdly, the outer circumference of the holder bracket is provided with the anti-loosening ring to provide the inner circumference and the frictional force of the cover holder, so that the cover holder can be prevented from flowing in the opposite direction of the rotation coupling due to vibration or steam pressure, Can be improved.

1 is a partially exploded perspective view showing a conventional electric cooker.
FIG. 2 is a perspective view showing an oven cover and a cover holder of an electric cooker according to a first embodiment of the present invention; FIG.
3 is an exploded perspective view showing an electric cooker according to a first embodiment of the present invention.
4 is a cross-sectional view illustrating an electric cooker according to a first embodiment of the present invention;
5 is a sectional view showing a cover holder of the electric cooker according to the first embodiment of the present invention.
6A and 6B are views showing an example of a detent ring of the electric cooker according to the first embodiment of the present invention;
7 is a sectional view showing a holder bracket of an electric cooker according to a first embodiment of the present invention.
8 is a sectional view showing an electric cooker according to a second embodiment of the present invention.
9 is a sectional view showing a cover holder of an electric cooker according to a second embodiment of the present invention.
10 is a plan view showing a cover holder of an electric cooker according to a second embodiment of the present invention.
11 is a perspective view showing a cover holder of an electric cooker according to a third embodiment of the present invention.
FIG. 12 is a perspective view showing a cover holder of an electric cooker according to a fourth embodiment of the present invention; FIG.

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

FIG. 2 is a perspective view showing an oven cover and a cover holder of an electric cooker according to a first embodiment of the present invention, FIG. 3 is an exploded perspective view showing the electric cooker according to the first embodiment of the present invention, FIG. 5 is a cross-sectional view showing a cover holder of an electric cooker according to a first embodiment of the present invention, and FIGS. 6A and 6B are cross-sectional views of a first embodiment of the electric cooker according to the first embodiment of the present invention. FIG. 7 is a cross-sectional view illustrating a holder bracket of an electric cooker according to a first embodiment of the present invention. Referring to FIG.

2 to 7, the electric cooker includes a main body (not shown), a lid 210, a control plate 250, an oven cover 220, and a cover holder 270.

Here, the main body (not shown) is provided with an inner pot (not shown) in which food is received, and a heating unit for heating the inner pot (not shown) and a controller for controlling the temperature of the heating unit.

The lid 210 is coupled to an upper portion of the main body (not shown), and a control plate 250 is provided on a lower surface of the lid 210. At this time, a holder bracket 260 is coupled to one side of the control plate 250.

Meanwhile, the control plate 250 is provided with a pressure-corresponding operation means 251a which is operated according to the inner space pressure of the inner pot along the communication hole 251 through which the steam flows.

Here, a plurality of the communication holes 251 may be provided on the control plate 250. The communication holes 251 may be provided with various kinds of pressure-operated operation means 251a such as a pressure-relief valve, a solenoid valve, a non-return type steam discharge unit, and a lid opening prevention unit.

The lid 210 may be provided with a lead plate 230 integrally covering the lower surface of the lid 210 and the control plate 250.

At this time, the lead plate 230 is provided with a corresponding hole 231 corresponding to the communication hole 251. The oven cover 220 is provided with steam (steam) along the portion corresponding to the corresponding hole 231, A discharge hole 222 is formed.

A hole packing 244 may be provided between each corresponding hole 231 and the communication hole 251. Between the oven cover 220 and the lead plate 230, A control packing 241 and a control packing cover 242 may be provided along the rim of the formed region.

The oven cover 220 is formed with a through hole 221 through which the holder bracket 260 passes and is detachably attached to the lower side of the control plate 250. The upper end of the inner pot do. At this time, an inner pot packing (not shown) is provided on the rim of the oven cover 220 to prevent the steam from leaking between the rim of the inner pot (not shown) and the rim of the oven cover 220.

The oven cover 220 may be mounted on the lower side of the control plate 250 when the holder bracket 260 passing through the through hole 221 and the cover holder 270 are coupled to each other, When the holder bracket 260 and the cover holder 270 are disengaged from each other, they can be separated from the lower side of the control plate 250.

The cover holder 270 is hollow so as to form a threaded hole 272 to be fastened to the threaded portion 261 of the holder bracket 260 exposed through the through hole 221, And is coupled to rotate around the rim of the through hole 221.

In detail, the cover holder 270 may be rotated while being coupled to the through hole 221 of the oven cover 220.

At this time, when the holder bracket 260 is inserted into the hollow portion 271 formed in the cover holder 270, the screw hole portion 272 and the screw coupling portion 261 are screwed together, The cover holder 270 and the holder bracket 260 can be fastened. In the opposite direction, the threaded portion 261 and the threaded hole 272 can be separated.

Thus, the cover holder 270 is not detached from the oven cover 220 when the oven cover 220 is rotated to be attached to or detached from the holder bracket 260 for detachment of the oven cover 220. Accordingly, it is possible to eliminate the inconvenience of separately storing the cover holder 270 when the oven cover 220 is detached, and it is possible to prevent the deterioration of the function of the product due to the loss of the cover holder 270.

If the oven cover 220 is placed on the bottom portion of the lid and the cover holder 270 restrained by the oven cover 220 is turned without the hassle of finding a separately stored cover holder 270, 220) can be mounted, so that the convenience of the product can be improved.

4 to 5, the cover holder 270 includes a locking part 270a which is engaged with one side of a rim of the through hole 221 and a locking part 270b which is inserted through the through hole 222 And an insertion portion 270b.

In this case, the term 'one side of the rim of the through hole 221' is understood to mean the bottom when the cover holder 270 is inserted from the lower side to the upper side of the through hole 221 as shown in FIG. 4, And the other surface is the upper surface which is the opposite surface of the one surface.

The insertion portion 270b is formed to have a diameter equal to or smaller than the diameter of the through hole 221 and the engagement portion 270a is formed to be wider than the diameter of the through hole 221 at the lower portion of the insertion portion 270b. Diameter.

Accordingly, when the insertion portion 270b is inserted into the through hole 221, the upper surface of the engagement portion 270a may be hooked on the lower edge of the through hole 221. [

A detent groove 273 is formed along the circumferential direction on the outer circumferential surface of the insertion portion 270b and a detent ring 280 can be coupled to the detent groove portion 273. [ At this time, the stop ring 280 may use a C-type stop ring or a steel stop ring 380 of the KS standard.

It is preferable that the outer end of the detent ring 280 protrude from the outer circumferential surface of the insertion portion 270b when the detent groove portion 273 is inserted. And may be engaged with the top surface of the through hole 221 by being coupled to the detent groove portion 273 inserted through the through hole 221.

Accordingly, the cover holder 270 can be rotated in a restrained state so as not to be separated from the through-hole 221, and the inner pot can be scratched or scratched when the cover holder 270 falls into the inner pot Damage to the inner pot can be prevented, deterioration in cooking quality due to damage to the inner pot can be prevented, and the satisfaction of the user can be improved.

5 to 7, a screw hole 272 having a first screw thread is formed along the inner periphery of the lower portion of the hollow portion 271 of the cover holder 270, and the lower portion of the holder bracket 260 It is preferable that a threaded portion 261 with a second thread 261a screwed to the first threaded portion along the outer periphery is formed.

In detail, when the cover holder 270 is rotated in one direction with the holder bracket 260 inserted into the hollow portion 271, the threads of the screw engagement portion 261 and the screw hole portion 272 are rotated And the oven cover 220 can be mounted in close contact with the lower surface of the lid 210.

Accordingly, when the cover holder 270 is fastened, the oven cover 220 can be coupled to the oven cover 220 only by a simple rotation without considering any directionality, thereby improving the usability of the product.

The hollow portion 271 of the cover holder 270 is provided with a stopper end protrusion 275 along the upper edge of the screw hole 272 so that the stopper protrusion 263 protruding from the outer circumference of the holder bracket 260 is engaged. ) Is preferably formed.

The stopper stepped portion 275 may be formed at an upper portion of the threaded hole portion 272 and the stopper protrusion portion 263 may be formed at an upper portion of the threaded portion 261 of the holder bracket 260 .

The stopper protrusions 263 may be formed in such a manner that when the screw engagement portion 261 is engaged with and inserted into the screw hole portion 272 and the oven cover 220 is in close contact with the bottom portion of the lid 210, The depth of insertion of the threaded hole portion 272 of the threaded engagement portion 261 can be limited by being hooked on the jaw portion 275.

Accordingly, when the cover holder 270 is engaged, the holder bracket 260 can be prevented from being excessively pulled downward, thereby preventing the coupling portion with the control plate 250 from being damaged.

The stopper protrusion 263 may be formed with a fixing part 265 fixed to the control plate 250. The fixing portion 265 may be fastened to the control plate 250 by fastening through a screw or through an adhesive.

The upper surface of the stopper protrusion 263 may be formed with a packing groove 264 through which the sealing packing 243 is inserted. The sealing packing 243 is provided to surround the outer circumference of the fixing portion 265 and is inserted into the packing groove portion 264 so that when the fixing portion 265 is fixed to the control plate 250, It is possible to prevent the steam from leaking to the control plate 250 through the outer circumference of the fixing portion 265 by being pressed between the upper surface of the fixing plate 263 and the lead plate 230.

The screw engaging portion 261 is provided at a depth equal to or greater than the depth of the screw hole portion 272 such that an end of the screw engaging portion 261 when engaged with the cover holder 270 and the holder bracket 260 penetrates the screw hole portion 272 desirable.

Accordingly, the user can confirm the degree of engagement with the holder bracket 260 through the height difference between the end of the screw coupling portion 261 and the bottom surface of the cover holder 270.

An outer circumference of the stopper protrusion 263 of the holder bracket 260 is formed with a fixing groove 262 to which a loosening preventing ring 290 is coupled and an inner circumference of the hollow portion 271 of the cover holder 270 is closed Preventing ring 290, as shown in Fig.

Here, the lower inner periphery 271a of the hollow portion 271 of the cover holder 270 may be formed to be narrower than the upper inner periphery 271b. The release preventing ring 290 is preferably made of rubber or silicone.

The upper inner circumference 271b of the hollow portion 271 may be formed to have a diameter equal to or greater than an outer diameter of the outer side of the release preventing ring 290 inserted into the fixing groove 262, The diameter of the lower inner periphery 271a of the stopper protrusion 263 is larger than the diameter of the stopper protrusion 263 but smaller than the diameter of the outer end of the release ring 290. [

When the holder bracket 260 is inserted into the hollow portion 271 and the threaded hole portion 272 is rotationally coupled to the threaded portion 261, the release preventing ring 290 is inserted into the hollow portion 271 And is moved to the lower inner periphery 271a.

The release preventing ring 290 inserted into the lower inner circumference 271a is pressed between the lower inner circumference 271a of the hollow portion 271 and the fixing groove 262 to form a frictional force.

Accordingly, the cover holder 270, which is unidirectionally rotated by the holder bracket 260, can be prevented from rotating in the direction opposite to the coupling due to vibration or steam pressure, thereby improving the safety of the product.

In order to increase the frictional force of the release preventing ring 290 as the screw engaging portion 261 and the screw hole portion 272 are coupled to each other inside the hollow portion 271 of the cover holder 270, It is preferable that the pressing stepped portion 274 is formed to be narrowed as it goes toward the front end portion.

In detail, the pressure step jaw 274 can link the connection portion between the narrow inner lower rim 271a and the wide inner upper rim 271b in an inclined manner. The release preventing ring 290 in contact with the pressing step portion 274 forms a high frictional force in the lower portion of the pressing step portion 274 and can form a low frictional force in the upper portion of the pressing step portion 274 .

Accordingly, the user can confirm the extent to which the screw coupling portion 261 is inserted and joined to the inside of the screw hole portion 272 by changing the rotation sensitivity of the cover holder 270 when the cover holder 270 is loosened and tightened, The time when the cover 220 is released and the time when the cover 220 is tightly coupled can be predicted, and the usability of the product can be improved.

9 is a cross-sectional view of a cover holder of an electric cooker according to a second embodiment of the present invention, and FIG. 10 is a cross-sectional view of a cover holder of the electric cooker according to a second embodiment of the present invention. 2 is a plan view showing a cover holder of the electric cooker according to the embodiment.

Since the basic configuration except for the structure in which the cover holder 570 is coupled to the oven cover 220 in the second embodiment is the same as that in the first embodiment described above, a detailed description of the same configuration will be omitted.

8 to 10, the cover holder 570 includes a latching part 570a which is engaged with one side of the rim of the through-hole 221, and a latching part 570b penetrating through the through- Section 570b.

The insertion portion 570b may be formed with a locking protrusion 573 protruding outward in the radial direction so as to be engaged with the other surface of the through hole 221 through the through hole 221.

The insertion portion 570b is formed to have a diameter equal to or less than the diameter of the through hole 221 and the engagement portion 570a is formed at a lower portion of the insertion portion 570b so as to be wider than the diameter of the through hole 221 Diameter.

Accordingly, when the insertion portion 570b is inserted into the through-hole 221, the upper surface 570c of the latching portion 570a may be hooked on the lower edge of the through-hole 221. [

At this time, the locking protrusion 573 may be elastically deformed by a pressing force, and may penetrate the through hole 221 through an elastic deformation which is narrowed radially inward when pressed toward the through hole 221 . After the penetration, it can be restored to the upper surface of the rim of the through hole 221 by being restored and expanded to the outside in the radial direction. Accordingly, the cover holder 570 can be rotated in a restrained state so as not to be detached from the through hole 221.

Here, it is preferable that two or more of the locking protrusions 573 are provided. The engaging protrusions 573 may be formed to have a different size from the inner surface of the engaging protrusion 573 on the inner surface of one of the engaging protrusions with respect to the center of the through hole 221, It is preferable to be arranged so as to face each other. Accordingly, even when the cover holder 570 is warped to one side, it can be firmly restrained without being detached from the through hole 221. [

Meanwhile, the locking protrusion 573 may extend upward along the end of the insertion portion 570b, and may be bent outward in the radial direction. At this time, the locking protrusion 573 may be bent so as to be perpendicular to the edge surface of the insertion portion 570b, and may be bent obliquely for easy insertion into the through hole 221. [

When the locking protrusion 573 is inclined, an insertion guide surface 573a may be formed at an upper portion of the locking protrusion 573 and inclined upwards toward the inside. The inner end 573b of the insertion guide surface 573a has a diameter equal to or smaller than the diameter of the through hole 221 and the outer end 573c of the insertion guide surface 573a is connected to the through hole 221 As shown in FIG.

The inner end 573b of the insertion guide surface 573a is inserted to the inside of the through hole 221 and the insertion guide surface 573a is inserted into the through hole 221 when the locking protrusion 573 is inserted. As shown in FIG.

At this time, when the cover holder 570 is pressed, the insertion guide surface 573a is pressed in an inclined direction by the rim of the through hole 221, and the engaging projection 573 is easily moved radially inward It can be elastically deformed.

When the outer end 573c of the insertion guide surface 573a passes through the through hole 221, the locking protrusion 573 may be elastically restored and hooked on the upper surface of the through hole 221.

11 and 12 are perspective views showing a cover holder of an electric cooker according to third and fourth embodiments of the present invention. In the third and fourth embodiments, the basic configuration except for the shapes of the cover holders 370 and 470 is the same as that of the first and second embodiments described above, so a detailed description of the same configuration will be omitted.

As shown in FIG. 11, it is preferable that the outer circumference of the lower end of the cover holder 370 is provided with a recessed portion 389 for holding the user. At this time, the concave-convex portion 389 may be provided on the outer surface of the polygonal protrusion 378 formed along the outer periphery of the lower end of the cover holder 370.

Accordingly, the user can grasp the flat outer surface of the polygonal protrusion 378 and accurately transmit the rotational force to the cover holder 370. Even when the moisture layer due to the steam is formed on the outer surface of the polygonal protrusion 378, The rotation operation can be facilitated without slipping due to an increase in frictional force through the portion 379.

As shown in FIG. 12, it is preferable that a de-cut portion 478 for holding the user is formed on the outer periphery of the lower end of the cover holder 470. Here, the de-cut portion 478 may be formed by cutting one side and the other side of the outer periphery of the cover holder in a flat manner.

Accordingly, the user can grasp the flat portion of the de-cut portion 478 to accurately transmit the rotational force to the cover holder 470, and can easily rotate without being slipped on the outer surface of the cover holder 470 .

Of course, it is also possible to form the de-cut portion and the concavo-convex portion together on the outer periphery of the lower end of the cover holder.

As described above, the present invention is not limited to the above-described embodiments, and variations and modifications may be made by those skilled in the art without departing from the scope of the present invention. And such modifications are within the scope of the present invention.

100,200: Electric cooker 210: lid
20,220: oven cover 21: inner pot packing
221: Through hole 22, 222: Vapor discharge hole
230: lead plate 231: corresponding hole
250: control plate 251: communication hole
241: Control Packing 242: Control Packing Cover
243: Seal packing 244: Hole packing
60: engaging portion 61: engaging wing portion
260: holder bracket 261:
262: fixing groove 263: stopper projection
264: packing groove portion 265:
70, 270, 370, 470, 570: Cover holder 270a, 570a:
270b, 570b: insertion portion 271: hollow portion
272: screw hole portion 273: stop groove portion
274: pressure step jaw 275: stopper jaw
280,380: Stop ring 290: Release ring
378: polygonal projection 379: concave / convex portion
478: di-cut part 573:
573a: Insertion guide face

Claims (10)

A main body having an inner pot in which food is received;
A lid coupled to an upper portion of the main body to be opened and closed;
A control plate provided on a lower surface of the lid and provided with a pressure corresponding operation means operated according to a height of the inner pot internal space pressure and having a holder bracket coupled to one side;
An oven cover for sealing the upper portion of the inner pot, wherein the oven cover is formed with a through hole through which the holder bracket penetrates and is detachably attached to the lower side of the control plate; And
And a cover holder which is provided in a hollow shape to form a threaded hole portion to be engaged with the threaded portion of the holder bracket exposed through the through hole and is coupled to rotate around the rim of the through hole,
Wherein the hollow portion of the cover holder is formed with a stopper step portion along an upper edge of the screw hole portion so that a stopper projection protruding from the outer periphery of the holder bracket is engaged. The method according to claim 1,
Wherein the cover holder includes an engaging portion which is engaged with one side of the rim of the through hole and an insertion portion formed through the through hole and formed with a detent groove into which the detent ring is inserted,
And the rim of the through hole is constrained between the retaining portion and the detent ring. The method according to claim 1,
Wherein the cover holder includes a latching portion which is engaged with one side of the rim of the through hole and an insertion portion which is inserted into the upper portion through the through hole,
Wherein a protrusion protruding radially outward is formed at an end of the insertion portion so as to be engaged with the other surface of the through hole through the through hole. The method of claim 3,
Wherein the engaging protrusion extends along an end of the insertion portion and is formed to be bent radially outward. The method according to claim 1,
Wherein the holder bracket has a fixing groove formed on an outer circumference of the holder bracket,
And an inner circumference of the hollow portion of the cover holder is formed to selectively frictionally contact the release preventing ring. 6. The method of claim 5,
Wherein an inner circumference of the hollow portion of the cover holder is formed with a pressing step portion that is narrowed from the upper portion to the lower portion so that the frictional force of the loosening prevention ring increases as the screw portion and the screw hole portion are mutually coupled. The method according to claim 1,
Wherein the threaded portion is provided at a depth equal to or greater than a depth of the threaded hole so that an end of the threaded portion when the cover holder and the holder bracket are engaged with each other passes through the threaded hole portion. delete The method according to claim 1,
Wherein an upper surface of the stopper protruding portion is formed with a packing groove portion into which a sealing packing is inserted. The method according to claim 1,
Wherein one of the cut portion and the concave / convex portion is formed on the outer periphery of the lower end of the cover holder for holding the user.

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