WO2021215644A1

WO2021215644A1 - Manhole cover opening/closing structure using screw

Info

Publication number: WO2021215644A1
Application number: PCT/KR2021/002629
Authority: WO
Inventors: 최익구
Original assignee: 주식회사 세계주철
Priority date: 2020-04-24
Filing date: 2021-03-03
Publication date: 2021-10-28
Also published as: KR102179723B9; CN115427635A; KR102179723B1

Abstract

The present invention relates to a manhole cover opening/closing structure using a screw. More particularly, the present invention relates to a manhole cover opening/closing structure using a screw, wherein an attachable/detachable support rack is installed inside a manhole frame, and a screw is screw-coupled to the support rack, the screw penetrating the manhole cover and having an angled head portion at the upper end thereof. The manhole cover opening/closing structure using a screw comprises: a female screw holder formed at the center of the support rack, the female screw holder having a fastening hole formed to penetrate the center thereof in the upward/downward direction, a sloping surface being formed on the upper portion of the fastening hole so as to be wider in the downward direction, and the sloping surface having at least one guide formed along the sloping surface in the upward/downward direction; multiple female-screw pieces each having an upper outer peripheral surface formed to correspond to the sloping surface, and having multiple screw grooves separately formed in the longitudinal direction on the inner peripheral surface thereof so as to correspond to a screw such that same engage with the guide and move upwards/downwards inside the fastening hole; a support plate having a through-hole formed at the center thereof such that a screw penetrates same, the support plate supporting lower portions of the female-screw pieces; a spring positioned beneath the support plate; and a ring-type spring holder provided beneath the center of the support rack so as to support the spring.

Description

Manhole cover opening and closing structure using screws

The present invention relates to a structure for opening and closing a manhole cover using a screw, and more particularly, while the number of rotations of the screw is minimized in the process of locking the manhole cover, even if the manhole cover rises due to vibration, etc. It relates to a structure for opening and closing a manhole cover using a screw that is initialized with a screw so that the operation of opening and closing the manhole cover is easy and safety is ensured.

The manhole is installed in the opening of a drainage pipe through which sewage or rainwater is drained, or is installed in the opening of an underground structure installed for the burial of power lines and communication lines. It is composed of a manhole cover that opens or closes the manhole by being seated on the rib formed on the inner circumferential surface of the

In such a conventional manhole, since the manhole cover is simply seated in the manhole frame, the manhole cover is released from the manhole frame without permission due to an impact or reverse flow of sewage or sewage when driving a vehicle, thereby causing damage or accidents to pedestrians or vehicles. There was a problem, and as the manhole cover was opened, rainwater flowed into the sewage pipe and the amount of sewage flowing into the sewage treatment plant increased, resulting in unnecessary sewage treatment costs.

Accordingly, the applicant of the present invention has proposed various methods for opening and closing the manhole cover easily and securely, and as an example, a detachable support is installed on the inside of the manhole frame in Patent Registration No. 10-0590910, and the support has a manhole cover. The screw passing through is screwed together, so that the screw is coupled to the support hung on the manhole frame to close the manhole cover, and as the screw rotates in the opposite direction to the manhole cover closing process, the closed state of the manhole cover is released and opened, In the manhole cover opening process, a manhole cover opening/closing structure in which the support provided on the lower part of the screw lifts the manhole cover is presented.

Specifically, as shown in FIGS. 1 and 2 , in the conventional manhole 10, in the manhole cover opening and closing structure, a part of the upper side is opened on the inner circumferential surface of the support jaw 22 protruding on the inside of the manhole frame 20, and the locking jaw 26 ) is formed so as to form a plurality of insertion grooves 24, and the fastening piece 36 inserted or separated into the insertion groove 24 at the edge of the support 30 having a female screw part 35 formed in the center. Formed, a through hole 41 is formed in the manhole cover 40 to rotatably insert the upper side of the screw 42 formed on the lower side of the male screw portion 45 fastened to the female screw portion 35, the screw ( 42) on the upper side of the screw 42 by forming a head portion 43 in contact with the upper surface of the manhole cover 40 and a support portion 44 in contact with the lower surface of the manhole cover 40, the head portion 43 of the screw 42). rotated to open and close the manhole cover 40, and in the process of opening the manhole cover 40, the support part 44 lifted the manhole cover 40.

In the drawings,

reference numerals

28 and 48 denote a concave groove 28 and a protrusion 48 for preventing rotation, 49 denotes a handle, and 15 denotes a packing.

In this conventional manhole cover opening/closing structure, when the screw 42 is rotated in the process of closing the manhole cover 40, the manhole cover 40 is lowered and becomes the same height as the manhole frame 20, and thereafter, for a firm closing, the screw ( 42) is rotated a few more times to have the support 30 slightly curved upwards to have elasticity as shown in FIG. 3, but the workers do not rotate the screw 42 enough to rotate the support 30 enough to bend will finish

If the manhole cover 40 is not locked with sufficient strength as described above, or even if the manhole cover 40 is locked with sufficient strength, as a long time elapses, when a car passes over the manhole cover 40, the screw 42 and the support ( 30) When the screw coupling between the two is slightly loosened by impact, a slight gap is generated between the manhole cover 40 and the manhole frame 20 as shown in FIG. As indicated by the chain line, rattling noise is generated, and a step is generated between the ground and the manhole cover 40, which causes a safety accident problem when driving a car, etc. When the screw 42 is damaged, and the screw 42 is severely damaged, there is a problem in that the manhole cover 40 is separated from the manhole frame 20 and a major accident occurs.

In the present invention, the number of rotations of the screw is minimized in the process of locking the manhole cover, so that the convenience of work is improved. The purpose of the present invention is to provide a structure for opening and closing the manhole cover using a screw that prevents a safety accident occurring while the manhole cover is lifted or separated from the manhole frame by making it the same height as the screw.

A feature of the present invention for achieving the above object is to install a detachable support on the inside of the manhole frame, and the support has a manhole cover using a screw configured to penetrate the manhole cover and screw a screw having an angled head at the top. In the opening/closing structure, a fastening hole formed at the center of the support and penetrating up and down is formed in the center, the upper part of the fastening hole is formed with an inclined surface that becomes wider toward the lower part, and one or more guides are formed on the inclined surface in the vertical direction along the inclined surface. ; a plurality of female screw pieces having an upper outer circumferential surface formed to correspond to the inclined surface, a screw groove corresponding to the screw formed on the inner circumferential surface, divided into a plurality of pieces in the longitudinal direction, and being engaged with the guide to move up and down in the fastening hole; a support plate having a through hole through which the screw is penetrated in the center and supporting the lower portion of the female screw piece; a spring positioned under the support plate; There is a manhole cover opening and closing structure using a screw that is provided at the lower center of the support and includes a ring-type spring holder for supporting the spring.

In the above, the guide is formed to protrude corresponding to the number of female screw pieces at equal intervals on the inclined surface of the female screw holder, and when the female screw piece is positioned on the inclined surface, each side is formed to be spaced apart by the width of the guide and slides between the guides.

As another example, one or more guides are formed on the inclined surface of the female screw holder in the longitudinal direction, the side surfaces of the female screw pieces are formed so as to be in contact with each other when positioned above the inclined surface, and the female screw pieces corresponding to the guide are formed to engage the guide. characterized in that

On the other hand, since the female screw pieces have to form a screw thread inside the fastening hole, an identification mark for guiding the assembly position is displayed on the surface of each female screw piece for the convenience of assembly.

According to the present invention configured as described above, when the operator applies force to the manhole cover with a foot or a heavy object in the process of closing the manhole cover, the female screw pieces fall along the inclined surface while rubbing the outer diameter of the screw, After the pressing force is removed, the screw is rotated a few turns so that the manhole cover is firmly fixed, thereby ending the process of closing the manhole cover. This has an improved effect.

In addition, as a car passes over the manhole cover while the manhole cover is locked, the screw coupling between the screw and the female screw piece is slightly loosened by the impact, and as the screw rotates, the manhole cover is slightly buoyed between the ground and the manhole cover. Even if the step is generated, when the load of the vehicle is applied again, the female screw pieces are lowered along the slope, so that the safety accident such as the manhole cover is caught on the wheel of the vehicle and rattling or detaching does not occur.

1 is an exploded perspective view showing a conventional manhole cover opening and closing structure;

Figure 2 is a cross-sectional view showing a conventional manhole cover opening and closing structure

3 is a cross-sectional view showing a firm locking state of the manhole cover in the conventional manhole cover opening and closing structure;

Figure 4 is a cross-sectional view showing an embodiment of the conventional manhole cover opening and closing structure

5 is a cross-sectional view showing the opening and closing structure of a manhole cover using a screw according to an embodiment of the present invention;

Figure 6 is an enlarged perspective view showing the main part in the manhole cover opening and closing structure using a screw according to an embodiment of the present invention;

7 is a perspective view showing a female screw piece according to an embodiment of the present invention;

8 and 9 are views showing another embodiment of the present invention;

10 and 11 are diagrams of the use state of the manhole cover opening and closing structure using a screw according to an embodiment of the present invention;

*Explanation of symbols for main parts of the drawing*

100: manhole frame 200: support

300: manhole cover 400: screw

410: head 420: support

500: female thread holder 510: fastening hole

520: slope 530: guide

600: female thread piece 700: support plate

800: spring 900: spring holder

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

The manhole cover opening and closing structure using a screw according to the present invention installs a detachable support 200 on the inside of the manhole frame 100 as shown in FIGS. 5 to 8 , and the support 200 has a manhole cover 300 ), in the manhole cover opening and closing structure configured such that a screw 400 having an angled head 410 at the upper end and a supporting portion 420 at the lower portion of the manhole cover 300 is screwed through, the support 200 of It is formed in the center, the fastening hole 510 is formed through the center vertically, and the upper part of the fastening hole 510 is formed with an inclined surface 520 that becomes narrower toward the upper part, and one or more guides 530 are formed on the inclined surface 520 . ) is a female screw holder 500 formed in the vertical direction along the inclined surface (520); The upper outer circumferential surface is formed to correspond to the inclined surface 520 , and a screw groove corresponding to the screw 400 is formed on the inner circumferential surface to be divided into a plurality of pieces in the longitudinal direction and engaged with the guide 530 to engage the inclined surface in the fastening hole 510 . A plurality of female threaded pieces 600 that are vertically moved along the 520; a support plate 700 having a through hole through which the screw 400 passes in the center and supporting the lower portion of the female screw piece 600; a spring 800 positioned under the support plate 700; It is formed in the lower center of the support 200 is configured to include a ring-shaped spring holder 900 for supporting the spring.

In the above, the female screw holder 500 is integrally cut or cast at the center of the support 200 , or is separately processed and coupled to the center of the support 200 by welding or the like.

And as shown in FIGS. 5 to 7 , the guide 530 protrudes corresponding to the number of female threaded pieces 600 at equal intervals on the inclined surface 520 , and the female threaded piece 600 is located on the inclined surface 520 . When doing so, each side is formed to be spaced apart by the width of the guide 530 and slides between the guides 530 .

That is, a female screw is formed on the inner periphery so as to be screwed with the screw, and a cylindrical female screw member is formed with an upper outer circumferential surface corresponding to the inclined surface, and then cut at equal intervals in the vertical direction to correspond to the interval between the guides 530. can be formed

As another example of the guide 530 , as shown in FIGS. 8 and 9 , one guide 530 is formed on the inclined surface 520 in the longitudinal direction, and the female threaded pieces 600 are located on the inclined surface 520 . When the side surfaces are in contact with each other, the

guide grooves

610 and 620 are formed on the outer circumferential surface of the female threaded piece 600 corresponding to the guide 530 to engage the guide 530 .

On the other hand, since the female screw pieces 600 have to form a thread inside the fastening hole 510, each female screw piece 600 is marked with an identification mark to guide the assembly position for the convenience of assembly to ensure the convenience of work. , '1', '2', and '3' are indicated in the present invention.

The support plate 700 is formed in a ring shape so that the screw can pass therethrough, and a spring support protrusion is formed at the center of the support plate 700 .

And the ring-shaped spring holder 900 is formed under the female screw holder 500 to support the spring, and the uppermost end of the female screw piece 600 by the spring 800 is the uppermost end of the fastening hole 510 . is located in

An example of use of the present invention configured as described above will be described below.

In the process of closing the manhole cover, the operator positions the manhole cover 300 so that the lower end of the screw 400 is located in the fastening hole 510 as shown in FIG. 5, and then presses the manhole cover with a foot or a heavy object, as shown in FIG. As shown in, the female screw pieces 600 collide with the outer diameter of the screw 400, and the spring 800 is compressed so that the female screw pieces 600 descend and spread along the inclined surface, so the operator rotates the screw 400 It is possible to instantly insert vertically without having to do it.

In this process, the operator does not need to press the screw 400, because the screw 400 is moved upward by the support part 420 is limited and is lowered together with the lowering of the manhole cover.

Thereafter, when the pressing force is removed, the female screw pieces 600 are lifted upward by the tension of the spring 800 to be screw-coupled with the screw 400, and then, when the operator rotates the screw 400 several times, the screw ( As shown in FIG. 11 as the 400 is screwed with the female screw pieces 600, the manhole cover 300 is firmly locked.

Thereafter, when the manhole cover 300 is to be opened, the screw 400 is rotated in the opposite direction so that the manhole cover 300 is lifted by the support part 420 and opened.

On the other hand, while the manhole cover is being used, the coupling between the screw 400 and the female screw piece 600 is momentarily weakened due to the load of a vehicle, etc. When a force or load is applied, the female screw piece 600 is spread while descending on the inclined surface as described above, and the manhole cover is lowered again, so that the manhole cover is not separated from the manhole frame.

Claims

A detachable support 200 is installed on the inside of the manhole frame 100, and the support 200 penetrates the manhole cover 300 and has an angled head 410 at the top. In the manhole cover opening and closing structure using a screw configured to be screwed with a screw 400 having a portion 420,

It is formed in the center of the support 200, and the fastening hole 510 is formed through the center vertically, and the upper part of the fastening hole 510 is formed with an inclined surface 520 that becomes narrower toward the upper part, and the inclined surface 520 is formed. There, one or more guides 530 are formed in the vertical direction along the inclined surface 520, the female screw holder 500;

The upper outer circumferential surface is formed to correspond to the inclined surface 520 , and a screw groove corresponding to the screw 400 is formed on the inner circumferential surface to be divided into a plurality of pieces in the longitudinal direction and engaged with the guide 530 to engage the inclined surface in the fastening hole 510 . A plurality of female threaded pieces 600 that are vertically moved along the 520;

a support plate 700 having a through hole through which the screw 400 passes in the center and supporting the lower portion of the female screw piece 600;

a spring 800 positioned under the support plate 700;

consists of,

The guide 530 protrudes from the inclined surface 520 to correspond to the number of female threaded pieces 600 at equal intervals, and when the female threaded piece 600 is positioned above the inclined surface 520 , each side of the guide 530 . A manhole cover opening and closing structure using a screw, characterized in that it is formed to be spaced apart by the width and slides between the guides (530).
A detachable support 200 is installed on the inside of the manhole frame 100, and the support 200 penetrates the manhole cover 300 and has an angled head 410 at the top. In the manhole cover opening and closing structure using a screw configured to be screwed with a screw 400 having a portion 420,

It is formed in the center of the support 200, and the fastening hole 510 is formed through the center vertically, and the upper part of the fastening hole 510 is formed with an inclined surface 520 that becomes narrower toward the upper part, and the inclined surface 520 is formed. There, one or more guides 530 are formed in the vertical direction along the inclined surface 520, the female screw holder 500;

The upper outer circumferential surface is formed to correspond to the inclined surface 520 , and a screw groove corresponding to the screw 400 is formed on the inner circumferential surface to be divided into a plurality of pieces in the longitudinal direction and engaged with the guide 530 to engage the inclined surface in the fastening hole 510 . A plurality of female threaded pieces 600 that are vertically moved along the 520;

a support plate 700 having a through hole through which the screw 400 passes in the center and supporting the lower portion of the female screw piece 600;

a spring 800 positioned under the support plate 700;

consists of,

One guide 530 is formed on the inclined surface 520 of the through-hole in the longitudinal direction, and the female threaded pieces 600 are formed so that their side surfaces are in contact with each other when positioned on the inclined surface 520 , and any one female thread A manhole cover opening and closing structure using a screw, characterized in that guide grooves (610, 620) engaged with the guide (530) are formed on the outer peripheral surface of the piece (600).
[3] The structure of claim 1 or 2, wherein an identification mark guiding an assembly position is formed on the female screw pieces (600).
[3] The structure of claim 1 or 2, wherein a ring-shaped spring holder 900 for supporting the spring 800 is further provided at the lower center of the support 200.