KR101035444B1 - Drain cover for preventing theft - Google Patents

Abstract

PURPOSE: A link structure of a rotary opening/closing type waterway cover is provided to facilitate cleaning work inside a waterway and to prevent robbery through a simple connection structure. CONSTITUTION: A link structure of a rotary opening/closing type waterway cover is constituted as follows. A shaft hole(30) is formed at one side of the front surface or rear surface of a waterway cover(10) in the direction of a waterway, and a link shaft(20) which is inserted into the shaft hole of the waterway cover is formed on the other side thereof. A head portion which is equal to or larger than the inner surface of the shaft hole is formed at the end of the link shaft.

Description

Link structure of individual rotating retractable drainage cover with anti-theft function {Drain cover for preventing theft}

The present invention relates to an individual pivotal opening and closing drainage cover link structure, and more particularly, each drainage cover between the adjacent drainage cover is continuously axially coupled on one side to prevent loss due to theft and each drainage cover around the axis. The invention relates to a link structure of an individual rotationally open / closed drainage cover having an anti-theft function to facilitate the drainage cleaning operation by allowing the rotational opening and closing independently.

Typically, the drain cover is continuously installed in the longitudinal direction in the upper opening of the drain. This is to prevent the vehicle or pedestrian from falling into the drainage, and to filter out the contaminants introduced with rainwater and sewage drainage and rainwater to facilitate the smooth drainage and to easily clean the sediment accumulated in the drainage.

Drain cover is mainly used for grating composed by arranging several I bars ('I' shaped bars) at regular intervals inside the rectangular frame. (Also called a frame) is installed, and the grating is placed thereon for installation. Due to the relatively light weight of the grating, installation and installation are easy and simple.

However, the grating is a target of theft because it has the advantage of being easy to install as described above and easy to separate from the drain. In particular, when the value of raw materials or scrap metal rises, there is a problem in that loss of losses due to theft rapidly increases.

14 is an enlarged view illustrating main parts of a grating fixing structure according to the related art.

Conventionally, in order to prevent the loss of the grating, as shown in FIG. 14A, the shaft B is welded and fixed to the angle 100 upward, and after the grating is seated on the angle 100, the 'I of the grating is fixed. 'Saddle the saddle clip 120 between the bars 110, the bolt hole 122 formed in the center thereof is inserted into the bolt (B) and fastened by fixing the nut (N), or (B) of FIG. Put the saddle clip 120 between the 'I' bar 110 of the four ears of the grating as shown, and utilizes a method such as fixing the piece (P) by twisting the angle (100) Or, more simply, as shown in Fig. 14 (C) to prevent the loss by theft by directly welding the 'I' bar 110 of the grating to the angle 100.

However, although this grating fixing structure may have some effect in preventing the loss due to theft, it is cumbersome and time consuming when installing the grating, and in particular, maintenance work for collecting sediment in the drainage is difficult. This is often done, but in this case, even when the grating is dismantled from the angle, the nut (N) or the piece (P) must be loosened or the weld must be removed, which is very cumbersome and takes a long time.

In other words, the structure to prevent the loss of the grating due to theft is more unreasonable problem that it takes more work time to separate and fix the grating than the time required to collect the sediment, which makes the maintenance work difficult to be done quickly. This is what happens.

In addition, in the contents disclosed in Japanese Patent Application Laid-Open No. 10-2006-0116457, coupling pins protrude from both ends of one side of the frame constituting the grating circumference, and guide grooves are inserted to insert the coupling pins of adjacent gratings on the opposite side. The grating is provided with a connection structure of the grating is formed.

Because of this structure, the coupling pins formed on one side of the grating are continuously connected to each other so as to fit into the locking grooves, so that noise is minimized by interference with each other, and it is difficult to separate them arbitrarily, thereby preventing grating loss. .

However, those who are familiar with the grating coupling structure can easily separate the grating, so there is a disadvantage in that the loss prevention function cannot be expected.

And, there is a problem that the cumbersome work that must separate the grating when cleaning the drainage.

In addition, the contents published in the Korean Registered Utility Model Publication No. 20-0306404,

The front end frame of the frame to form an insertion portion is coupled to the coupling member consisting of the coupling piece and the insertion piece, the other end frame of the corresponding frame is formed with a coupling groove into which the insertion piece of the connection member is inserted and the coupling piece is placed In the grating having a connecting portion consisting of a coupling groove formed with a jaw portion, the separation prevention member having a locking piece formed at the end to the lower side frame of the connecting member is coupled to be located inward than the front end of the connecting member and the bottom of the other end frame There is a grating connection structure having a departure prevention portion formed with a locking step tangled in.

With this grating connection structure, several gratings can be easily and conveniently connected to each other continuously by the insertion part and the coupling groove, which are connecting parts. By making it impossible to prevent, theft of the grating is prevented.

However, if you are familiar with the grating connection structure, you can easily separate it from the connection state. Therefore, you cannot expect the anti-theft effect, and when cleaning the drain, remove all the grating and then clean it out of the drain. Also, after cleaning, the work is very cumbersome and takes a long time because the work of connecting the gratings is performed while putting the gratings on the drains again.

In addition, in the contents disclosed in Korean Patent Publication No. 10-0654920, hinges are formed between the gratings, and the inner grooves are formed in the L-shaped steels at the upper ends of the drainage passages so that the gratings are formed in the inner grooves in the longitudinal direction. It is inserted and extended to prevent theft, and two steel gratings are installed to be folded each time the sump is installed, so when cleaning the drainage, it is possible to fold one side and to clean the grating. To prevent loss by theft.

However, this is also a structure that can be easily taken away if one is familiar with the grating connection structure, as in the above-mentioned two prior application inventions. In addition, since the assembly structure is complicated, there is a problem that the maintenance work is very troublesome and takes a long time due to difficulty in separating and opening the connected grating during installation work and maintenance.

KR10-2006-0116457 A KR20-0306404 Y1 KR10-0654920 B1

Accordingly, the present invention has been made to solve the above problems, the purpose of which, as the body is bound to each other through a simple connection structure that is continuously axially coupled from one side between the drain cover is installed on the top of the drainage The aim is to prevent theft.

In addition, another object of the present invention is to provide a link structure of the individual pivot opening and closing drainage cover to facilitate the internal cleaning work of the drainage channel by allowing each drainage cover linked to the shaft on one side side to be rotated independently around the linked axis. There is.

The link structure of the individual pivotal opening and closing drainage cover having an anti-theft function of the present invention for achieving the above object,

In the drain cover which is continuously covered in the upper part of the drainage,

It is achieved by rotatably connecting a neighboring drainage cover by axial coupling means on one side side front and rear surface of each drainage cover.

In addition, the axial coupling means of the individual rotational opening and closing drainage cover having an anti-theft function of the present invention, characterized in that the shaft hole is formed in the front and rear of each side of the drainage cover, the bolt is fastened to the nut.

In addition, the shaft coupling means of the present invention is to form a shaft hole and a shaft hole corresponding to the shaft on one side, the front and rear of each of the drainage cover to be male and female between the adjacent drainage cover, and the tapered taper widening toward the rear end It is achieved by forming a head portion having an outer circumferential surface to facilitate insertion while preventing reverse departure.

In addition, the shaft having the head portion is formed in the front end of the shaft in a double, and the corresponding shaft hole to form a double shaft hole parallel to the adjacent 'I' bar reinforcement bar to form another double shaft hole parallel to the deviation of the combined shaft In addition, the head portion of the link shaft coupled thereto is also characterized in that the double head portion is formed at the interval between the shaft hole and the double shaft hole.

In addition, the present invention, the through-hole is formed in the center of the head portion, providing a separation prevention having a plurality of elastic wings inclined in the link axis direction around the through-hole, the fastening hole in the center of the link shaft end Forming and positioning the separation prevention means after passing through the through-hole fastening the fastener to the fastening hole, characterized in that for coupling the separation prevention.

The link structure of the individual pivotal opening / closing drainage cover having an anti-theft function according to the present invention having such a structure may bring the entire drainage cover connected at one time by rotatably axially coupling the front and rear portions of the body side of each drain cover with the neighboring drainage cover. Unless they are separated separately, it takes a long time to separate even if separated, there is an effect that can effectively prevent the loss due to theft.

In addition, the present invention, a head having a tapered outer circumferential surface is formed at the distal end of the shaft connecting the drainage cover is forced to push the head portion into the shaft hole when the coupling is engaged, once coupled to prevent the departure in the reverse direction, the shaft coupling of the drainage cover Work is very quick and easy. In particular, when the head is formed in duplicate, the anti-theft is more completely prevented so that theft prevention effect is improved.

In addition, the present invention, there is an advantage that the reverse departure prevention effect is further improved as the head portion is ring-shaped and coupled to be movable between the locking step of the shaft end.

In addition, the present invention has a merit that the shaft coupling portion is formed only on one side, so that opening and closing in the lateral direction can be performed around the same, so that maintenance work such as cleaning of the drainage can be performed very quickly and simply.

1 is a plan view of the retractable drainage cover according to the first embodiment of the present invention.
Figure 2 is a plan view of the drain cover is connected state according to the first embodiment of the present invention.
Figure 3a is an enlarged perspective view of the main portion showing a connected state of the drainage cover according to the first embodiment of the present invention.
Figure 3b is an enlarged cross-sectional view showing the main portion showing the connection state of the drainage cover according to the first embodiment of the present invention.
Figure 4 is a plan view showing the structure of the drainage cover according to the second embodiment of the present invention.
Figure 5 is a plan view showing a state in which the drain cover is connected according to the second embodiment of the present invention.
Figure 6 is an enlarged perspective view of the main portion showing a state in which the drain cover is connected according to the second embodiment of the present invention.
Figure 7 is a structure of the link shaft of the drainage cover according to the third embodiment of the present invention.
8 is a structure of the link shaft of the drainage cover according to the fourth embodiment of the present invention.
Figure 19a, 9b is a structural view of the link shaft of the drainage cover according to the fifth embodiment of the present invention.
10 is a link shaft connection state diagram of the drainage cover according to the fifth embodiment of the present invention.
Figure 11 is a plan view showing a connection structure of the drainage cover according to the sixth embodiment of the present invention.
12 is a plan view and a side view showing a connection structure of the drainage cover according to Embodiment 7 of the present invention.
Figure 13 is an operating state in which the drain cover is rotationally open according to the first embodiment of the present invention.
Figure 14 is an enlarged view of the main portion showing a grating fixing structure according to the prior art.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

(Example 1)

1 is a plan view of the retractable drain cover according to the first embodiment of the present invention, Figure 2 is a plan view of the drain cover is connected according to the first embodiment of the present invention, Figure 3a is a connection of the drain cover according to the first embodiment of the present invention Figure 3b is an enlarged perspective view showing the main portion, Figure 3b is an enlarged sectional view of the main portion showing the connected state of the drain cover according to the first embodiment of the present invention, Figure 4 is a drain cover is rotated open according to the first embodiment of the present invention This is a working state diagram.

As shown in these drawings, the drainage cover 10 has a structure in which reinforcement bars 12, also called 'I' bars, are arranged at regular intervals in a rectangular frame. It is configured to rest on 1). The reinforcement bar 12 constituting the drainage cover 10 performs a function of filtering contaminants while draining rainwater or sewage into the gap between each reinforcement bar 12, and particularly, a vehicle or a pedestrian in the drainage path. It also serves as a function to ensure safety so that it does not fall out.

Of course, the drainage cover 10 includes a drainage cover 10 or a trench cover made of cast iron metal in addition to the above-described grating, and the present invention will be collectively expressed as a drainage cover 10.

Drain cover 10 is installed in the drain or the sump (sump), the present invention is installed in the drain cover 10 is installed in a long length of the drain that is covered at least two or more drain cover (10) continuously. Apply.

Features of the present invention drainage cover 10, when viewed in front and rear view of the drainage direction, the link shaft 20 is formed on the right or left end of any one side of the front or rear and at the same time the link shaft 20 ) Is a structure in which the shaft hole 30 is fitted. In particular, the end portion of the link shaft 20 is formed with a head portion 22 having a diameter slightly larger than or equal to the inner diameter of the shaft hole 30 to be fitted into the shaft hole 30 by interference fit. In addition, since the head portion 22 forms a horn shape that decreases in diameter toward the end, an inclined surface 24 is provided at the circumference. The inclined surface 24 makes it easy to assemble by forcing the head portion 22 to be coupled to the shaft hole 30, but the separation in the opposite direction is difficult. In particular, the drainage cover 10 is galvanized to prevent corrosion, in which case the inner diameter of the shaft hole 30 may be slightly smaller. To this end, it is preferable to provide a tolerance such that there is no problem in assembling the head portion 22 of the link shaft 20. However, even if the inner diameter of the shaft hole 30 is slightly smaller than the outer diameter of the head portion 22 by the galvanizing, if a forced force is applied with a large force, a portion of the inner diameter of the shaft hole or the shaft hole 30 of the metal is crushed. Since the assembly is made, the tolerance portion of the shaft hole 30 does not require high precision.

As described above, each of the drainage cover 10 having the link shaft 20 and the shaft hole 30 arranged side by side on the front and rear sides is not shown in the drawing, but the drainage cover 10 installed at the first or the rear side is protruded. The link shaft 20 is unnecessary. Of course, when constituting the shaft hole 30 on the upper end of the drainage channel corresponding to the link shaft 20, the link shaft 20 may be present.

Therefore, when the link shaft 20 does not have the link shaft 20 or the drainage cover 10 is seated on one side of the drainage channel, or when the shaft hole 30 is formed at the top of the drainage channel, the link shaft 20 of the drainage cover 10 may be moved to the shaft hole ( 30) to assemble and settle.

Subsequently, the drainage cover 10 assembled in a subsequent order strongly corresponds to the shaft hole 30 of the drainage cover 10 in which the head portion 22 of the link shaft 20 is pre-seated as shown in FIGS. 2 and 3A and 3B. The head portion 22 of the link shaft 20 is pushed into the shaft hole 30 through a push fit. Horn head portion 22 is smoothly inserted into the shaft hole 30 by the inclined surface 24 of the circumference.

In this way, the entirety of the conduit is continuously linked to the conduit cover 10.

When the link shaft 20 of the drainage cover 10 coupled as described above is forced through the head portion 22 into the shaft hole 30 of the other drainage cover 10, the link shaft 20 is difficult to be reversed. That is, since the head portion 22 is in the form of a horn, the lower circumference of the head portion 22 may be reversed only by forcibly releasing it with a large force in a state where it is exactly aligned with the inner diameter of the shaft hole 30. However, it is difficult to realistically precisely align the circumferential end of the head portion 22 to the shaft hole 30.

As such, the continuous shaft-coupled drainage cover 10 has an advantage of preventing a loss accident due to theft because it is difficult to separate, and it is also possible to individually open and close the center of the link shaft 20. That is, when the drainage path is to be cleaned, there is no need to completely separate the drainage cover 10 from the drainage path, and thus, the cleaning operation may be performed in a state in which the drainage opening and closing is rotated to one side as shown in FIG. Even after completion, the open cover is rotated backwards to close automatically, so cleaning and finishing is very quick and easy.

(Example 2)

Figure 4 is a plan view showing the structure of the drain cover according to the second embodiment of the present invention, Figure 5 is a plan view showing a state in which the drain cover is connected according to the second embodiment of the present invention, Figure 6 is according to a second embodiment of the present invention An enlarged perspective view of the main portion showing a state in which the drainage cover is connected.

As shown in the drawings, the drainage cover 10 of Embodiment 2 has the same configuration as that of the first embodiment of the drainage cover 10 of the first embodiment constituting the link shaft 20 and the shaft hole 30. The distinguishing feature is that the head portion 22 'of the link shaft 20' and the corresponding shaft holes 30 and 30 'have a dual structure.

That is, the shaft holes 30, 30 'installed on the front or rear of the drainage cover 10 are formed side by side adjacent to the adjacent reinforcement 12, and eventually two parallel shaft holes 30, 30' Is formed in succession, and the link shaft 20 'coupled thereto also has a length enough to penetrate the two shaft holes 30 and 30' and at the same time penetrates the two shaft holes 30 and 30 '. It is to form the head portion 22, 22 'to be at the same time.

By this structure, when the link shaft 20 'of the drainage cover 10 is forcedly coupled to the shaft holes 30 and 30' of the drainage cover 10 pre-coupled to the drainage path, two-stage coupling is achieved.

First, the first stage coupling is made by forcibly inserting through the front head portion 22 'at the end of the link shaft 20' by applying a large force in a state corresponding to the front shaft hole 30.

In this state, the front head 22 'corresponds to the rear shaft hole 30' and the rear head 22 is in a state corresponding to the front shaft hole 30. As shown in FIG. When the force is pushed again in this state to force the link shaft 40 ', the front head portion 22' is in the rear shaft hole 30, 30 'and the rear head portion 22 is the front shaft hole 30. Forced insertion into the 30 'is a two-stage coupling.

In this way, when the link shaft 20 'is deeply inserted, the front and rear shaft holes 30 and 30' of the drainage cover 10 adjacent to the front and rear portions at the time of opening the drainage cover 10 are more stably supported. Becomes

In addition, when the linked drainage cover 10 is to be separated, the front and rear head portions 22 and 22 'formed on the link shaft 20' are exactly matched with the front and rear shaft holes 30 and 30 '. If the force is applied in the reverse direction in the state is separated, in reality, since the outer diameter of the link shaft (20 ') is smaller than the inner diameter of the shaft hole (30) (30') flows by the gap after the coupling. For this reason, simultaneously matching the front and rear head portions 22 and 22 'with the front and rear shaft holes 30 and 30' is a difficult task. As a result, in order to separate the head portion 22, 22 'from the shaft hole 30, 30', it is necessary to use equipment such as a cutting machine. It puts a tremendous burden on what can be done and prevents you from planning theft.

(Example 3)

7 is a structural view of the link shaft of the drain cover according to the third embodiment of the present invention.

As shown in the figure, the link shaft 40 and the head portion 40 are formed as separate bodies so that the head portion 40 is fitted around the link shaft 40 and the head portion 40 ) Is configured to freely flow on the link axis 40 as much as each other play.

That is, the locking projections 46 and 47 are formed around the front and rear of the link shaft 40 on which the head portion 40 is to be installed, and the head portion 40 is the locking projection 46 located at the end of the link shaft 40. ) To form an insertion hole 43 having a size enough to be press-fitted through. In particular, the front locking jaw 46 forms an inclined surface on the front surface for easy coupling with the insertion hole (43). In another method, the insertion hole 43 may have a rear side wider than the front side to form an inclined surface so that the insertion hole 43 may be more easily coupled by the inclined surface when fitted to the front locking jaw 46. have. At this time, the front and rear locking jaw 46, 47 is larger than the insertion hole 43 the size of the locking jaw 47 of the rear side than the locking jaw 46 located at the end of the link shaft (40). It is preferable to form so that the head portion no longer moves to the rear side.

Combination of the link shaft 40 and the head portion 42 of such a structure is the locking jaw 46 when the rear end of the insertion hole 43 of the head portion 42 is forcibly inserted corresponding to the link shaft 40 end. By the inclined surface of the head 42 is forcibly rides around the front locking jaw 46 is provided between the front and rear locking jaw 46, 47. After the head portion 42 passes through the front locking jaw 46, the head portion 42 is not easily separated and cannot pass through the rear locking jaw 47, so that the head portion 42 is the link shaft 40. In addition to maintaining the state firmly coupled to the front and rear engaging jaw (46, 47) is freely flows within the clearance range allowed between the link shaft 40 and the insertion hole 43 of the head portion 42. Normally, it will be kept downward by gravity, and when combined, the head 42 will be shaken to make the operation of matching the shaft holes 30 and 30 'very difficult.

In this state, when coupled to the shaft hole 30, 30 'of the other side drainage cover 10, the head portion 42 to the automatic shaft hole 30, 30' by the horn-shaped inclined surface 44 on the outer peripheral surface Part of the head portion 42 is forced through force is inserted through the shaft hole 30, 30 'inner.

Once the head portion 42 is inserted through the shaft holes 30 and 30 ', it is lowered on the link shaft 40 by gravity to coincide with the center of the link shaft 40 and the center of the head portion 42. It does not remain. This means that even if the link shaft 40 is located at the center of the shaft hole 30, 30 ′, the head portion 42 does not coincide with the center of the shaft hole 30, 30 ′. (30) (30 ') must be matched. Therefore, it is very difficult to separate the link shaft 40 from the shaft holes 30 and 30 ', and thus, it takes a long time for the separation to prevent theft.

(Example 4)

8 is a structural view of the link shaft of the drain cover according to the fourth embodiment of the present invention.

As shown in the drawing, the head portions 42 and 42 'are formed in two stages in front and rear of the link shaft 20', and the corresponding shaft holes 30 and 30 'are also formed in two stages. .

That is, the double shaft hole 30 further comprises a reinforcing bar 12 having a separate shaft hole 30 ′ parallel to the shaft hole 30 in the front or rear side of the drainage cover 10 having the shaft hole 30. 30 ', and the link shaft 40' coupled thereto has a length enough to penetrate through the two shaft holes 30, 30 'and at the same time a pair of the engaging jaw 46 ( 47) was formed in the front and rear portions of the link shaft 40 ', respectively, to couple the head portions 42 and 42' between the front and rear locking jaws 46 and 47, respectively.

With this structure, when the two heads 42 and 42 'of the link shaft 40' are forcedly inserted into the two shaft holes 30 and 30 ', the two heads 42 and 42' Since it becomes very difficult to align the two shaft holes 30 and 30 'at the same time, the loss due to theft can be further prevented.

(Example 5)

9A and 9B are structural diagrams of the link shafts of the drain cover according to the fifth embodiment of the present invention, and FIG. 10 is a diagram illustrating the link shaft connection state of the drain cover according to the fifth embodiment of the present invention.

The illustrated head portion 52 includes a separation preventing opening 53 having a plurality of elastic wings 54 inclined in the direction of the link axis 50 around the through hole 54 formed at the center thereof, and the separation chamber. The fastener 56 which firmly couples the earth 53 to the link shaft 50 is comprised. The fastener 57 may have a wedge structure that is forcibly fitted by screws or strikes. And a reinforcement (57) may be further configured to support the front of the departure prevention tool (53). The through hole 58 is also formed in the center of the reinforcement port 57.

The head portion 52 having such a configuration has the release preventing member 53 positioned at the end of the link shaft 50, and overlaps the reinforcing tool 57 in front of the link shaft 50. The fastening hole 51 and the separation prevention hole 53 and the reinforcing hole 57 in the center of the through-hole 58 are positioned side by side and then fasten the fastener (57).

 When the head portion 52 is forcibly inserted into the shaft hole 30, the elastic wings 55 of the separation preventing opening 53 are contracted and inserted, and then elastically return to be unfolded again after passing through the shaft hole 30. As a result, even when the link shaft 50 is retracted, the shaft hole 30 can never be exited, thereby ensuring a secure coupling state.

(Example 6)

11 is a plan view showing a connection structure of the drainage cover according to the sixth embodiment of the present invention.

In the link shaft shown in the drawing, the shaft hole 30 is formed in the front and rear sides of each side of the drainage cover 10, and the bolt 60 is inserted into the shaft hole 30 between the neighboring drainage channels and the nut 61 ) To connect.

Because it is connected by bolts and nuts, the structure is simple, and only the shaft hole needs to be processed, which is very easy to manufacture and has an advantage.

(Example 7)

12 is a plan view and a side view showing the connection structure of the drainage cover according to the seventh embodiment of the present invention may be used by applying the connection structure of the drainage cover of the present invention to the trench cover.

1-angle 10-drain cover 12-reinforcement
20,20 '-Link axis 22,22'-Head 24-Slope
30,30 '-Shaft 40,40'-Link shaft 42,42 '-Head
43-Borehole 44-Slope 46,47,46 ', 47'-Brace

Claims (8)

In rotatably connecting the drainage cover to the side,
The shaft hole 30 is formed at one side of the front or rear side of the drainage cover 10, and an outer diameter smaller than the inner diameter of the shaft hole 30 is formed at the opposite side thereof and inserted into the shaft hole 30 of the other drainage cover 10. A link shaft 20 is formed, and the head portion of the link shaft 20 is formed to have a head portion equal to or larger than the inner diameter of the shaft hole 30, and forcibly penetrates through the shaft hole 30 of the cover 10 of the other side. Combine,
The head portion is a link structure of the individual pivot opening and closing drainage cover having an anti-theft function, characterized in that the circumferential surface constitutes an inclined surface 24 whose diameter gradually decreases in the end direction.
The method according to claim 1, wherein the head portion and the link shaft (4) are separated from each other,
The locking jaws 46 and 47 are formed in front and rear around the link shaft 40 where the head parts 42 and 42 'are positioned.
The insertion hole 43, which is the same as or smaller than the locking jaw 46, 47, is formed in the center of the head 42, 42 ', so as to be force-fitted between the locking jaws 46, 47. A link structure of an individual rotating retractable drainage cover having an anti-theft function.
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