Manhole cover for rain water with sloped grating

Abstract

The present invention relates to a rainwater manhole cover equipped with an inclined grating. Accordingly, the technical gist of the present invention is to provide an inclined grating with a guide inclined plate and a split rib applied to the water inlet of the cover body, characterized in that rainwater ejected during backflow due to the rainy season or heavy rain is discharged diagonally (smooth water drainage and effortless water discharge action), thereby preventing safety accidents for pedestrians. The present invention is characterized by having a perforated hole formed larger than that of a conventional rainwater manhole cover (commonly referred to as a 'manhole cover', but hereinafter collectively called a manhole cover) to facilitate the smooth inflow of rainwater and ensure high visibility, allowing pedestrians and drivers to easily recognize the location or awareness of the manhole (ensuring pedestrian safety and driving safety), and in particular, enabling manhole workers to easily perform maintenance or replacement of the manhole cover (since the size or shape of the existing manhole is not changed, there is no problem with manhole work at all). In addition, the present invention is characterized by having a buffer bowl in the shape of a convex hemisphere facing downward formed on the bottom surface of a manhole cover, which disperses the impact of rainwater surging vertically during backflow to the side (formed to withstand backflow water pressure) and discharges it through an inclined grating. This allows the enormous amount of water (rainwater) rising vertically during backflow caused by heavy rain to be guided toward the edge of the manhole cover and then discharged through the inclined grating, thereby effectively discharging the water (rainwater) while reducing the vertical water pressure. The present invention is characterized by preventing the manhole cover from popping up and detaching from the manhole (upper opening) due to water pressure during backflow, thereby preventing secondary accidents that may cause impact to pedestrians or moving vehicles.

Description

Technology Field

[0001] The present invention relates to a sloped grating rainwater manhole cover characterized by providing a sloped grating with a guide slope plate and a split rib applied to the water inlet of the cover body, thereby allowing rainwater ejected during backflow due to the rainy season or heavy rain to be discharged diagonally (smooth water drainage and effortless water discharge action) to prevent safety accidents for pedestrians.

[0002] The present invention is characterized by having a perforated hole formed larger than that of a conventional rainwater manhole cover (commonly referred to as a 'manhole cover', but hereinafter collectively called a manhole cover) to facilitate the smooth inflow of rainwater and ensure high visibility, allowing pedestrians and drivers to easily recognize the location or awareness of the manhole (ensuring pedestrian safety and driving safety), and in particular, enabling manhole workers to easily perform maintenance or replacement of the manhole cover (since the size or shape of the existing manhole is not changed, there is no problem with manhole work at all).

[0003] In addition, the present invention is characterized by having a buffer bowl in the shape of a convex hemisphere facing downward formed on the bottom surface of a manhole cover, which disperses the impact of rainwater surging vertically during backflow to the side (formed to withstand backflow water pressure) and discharges it through an inclined grating. This allows the enormous amount of water (rainwater) rising vertically during backflow caused by heavy rain to be guided toward the edge of the manhole cover and then discharged through the inclined grating, thereby effectively discharging the water (rainwater) while reducing the vertical water pressure.

[0004] The present invention is characterized by preventing the manhole cover from popping up and detaching from the manhole (upper opening) due to water pressure during backflow, thereby preventing secondary accidents that may cause impact to pedestrians or moving vehicles. Background Technology

[0005] Generally, a manhole refers to a facility that allows people to enter for inspection or cleaning inside sewer pipes, or for connecting or joining pipes.

[0006] In pipelines, they are installed at starting points, junctions, places where the pipe diameter, direction, or gradient changes, or at midpoints of long pipelines.

[0007] In addition, manholes are frequently used as access points for underground public facilities, enabling inspection, maintenance, and system upgrades.

[0008] Most underground services include manholes for water, sewers, telephone, electricity, storm drains, district heating, and gas.

[0009] Manholes are classified according to type into water supply, rainwater, and sewage. Accordingly, rainwater manholes are used to allow rainwater collected from various sources to enter storm drains, while sewage manholes cover sewage pipes through which dirty water, such as domestic sewage and human waste, flows from households.

[0010] In other words, manhole-related technology primarily includes methods for accessing and maintaining various underground facilities in cities, such as sewers, electricity, telecommunications, and gas.

[0011] Accordingly, manhole covers (also called 'manhole covers' or 'manhole covers') and structures are made of cast iron, steel, concrete, or composite materials, and in order to evenly distribute the pressure on the ground and prevent the manhole cover from easily coming off, the opening is mainly formed in a circular shape, and the concrete manhole embedded in the ground is formed in a square shape.

[0012] For reference, wastewater generated in residential spaces (single-family homes, public housing, etc.) requires a sewage pipeline system for treatment, and in the case of rainwater, specific facilities capable of treating it are also essential.

[0013] Domestic wastewater generated in residential spaces is collected in a sewage receiving tank and transported to a sewage treatment plant through sewage pipes.

[0014] In addition, rainwater generated from residential spaces is collected in storm drains and then discharged into streams or rivers through storm drains.

[0015] As such, sewage manholes and stormwater manholes are absolutely necessary to manage sewer pipeline facilities.

[0016] Due to heavy rains that have persisted for the past few years, accidents involving the detachment of manhole covers (commonly referred to as 'manhole covers', but referred to as manhole covers below) are frequently occurring within apartment complexes.

[0017] Such accidents pose a serious threat to pedestrian and vehicle safety and cause social and economic losses.

[0018] In particular, during heavy rainfall, phenomena are occurring where manhole covers are blown up by sewer pressure or disappear due to water flowing onto the roads.

[0019] In other words, existing manhole covers have a structural weakness in that they cannot withstand strong water pressure and detach; furthermore, restoration work is difficult after detachment, and there is a lack of preventive measures to prevent recurring accidents.

[0020] Furthermore, the detachment of manhole covers poses a significant danger to pedestrians and drivers.

[0021] For example, the main causes of manhole accidents are falls and manhole displacement. In the case of falls, there are instances where people fall because they fail to see a manhole cover that is open at an angle.

[0022] However, in reality, most cases of death or injury occur when manholes become dislodged due to reasons such as heavy rain, and there are also accidents where people fall when stepping on corroded manholes.

[0023] There was a case in December 2023 in Busan where a person in their 20s walking on the street stepped on a manhole and the manhole cover broke, causing an accident. In 2021, there was also a case where a resident of an apartment complex fell into a manhole and was injured when the manhole manager had left the manhole cover open for a short while.

[0024] In addition, when looking at the status of manhole fall prevention facility installations by local government, as of 2023, only 162,371 out of 3.43 million manholes had fall prevention facilities installed, meaning that on average, only one out of every 20 manholes had them installed.

[0025] Based on Seoul, it can be seen that only 4% of all manholes are equipped with fall prevention measures, which means that fall accidents can occur frequently.

[0026] Although systematic installation of manhole fall prevention facilities can prevent falls, the current situation is that it cannot resolve the problem of manhole covers bursting or opening.

[0027] To elaborate, accidents caused by manholes separating due to natural disasters such as heavy rain account for the majority of accidents to date, making this one of the issues that requires focus in resolving manhole-related problems.

[0028] When heavy rain occurs, there are a significant number of cases where manhole covers fail to cope with water pressure differences, causing them to suddenly pop up or detach, resulting in deaths or accidents among residents.

[0029] In addition, when heavy rain falls, the ground rises with water, making it impossible to gauge the location of manholes, and generally, it is difficult for people to walk while avoiding them.

[0030] For reference, around July 2020, when heavy rain exceeding 80mm per hour poured down in Busan, a middle school student fell into a manhole in an apartment complex.

[0031] The investigation revealed that the accident occurred because the manhole cover opened as sewage backed up due to heavy rain.

[0032] Another case occurred in 2022 when a brother and sister went missing after being sucked into a manhole in Seocho-dong during heavy rains, and they were later found dead.

[0033] In 2023, when Typhoon No. 6 occurred, a bus was stopped near an apartment in Changwon, Gyeongnam, and as the manhole popped up, the manhole cover came up through the bottom of the bus.

[0034] Fortunately, there were no people at that location, so there were no casualties, but had there been, it could have led to a fatal accident.

[0035] As such, excluding worker accidents, fall accidents and manhole displacement accidents continue to occur frequently.

[0036] Additionally, while various manhole technologies are being promoted and implemented, current manholes are operating exactly the same as before, and facilities related to fall prevention are not being properly installed.

[0037] Therefore, it is necessary to consider meticulous countermeasures and solutions for fall accidents and manhole displacement accidents. Prior art literature

[0038] 1. Korean Patent Publication No. 10-2024-0040692 (Published March 28, 2024) The problem to be solved

[0039] The present invention aims to solve the aforementioned problems, and its technical essence is to provide a sustainable and safe environment by constructing a manhole cover system capable of withstanding natural disaster environments such as monsoon rains, typhoons, and heavy rain.

[0040] Accordingly, the present invention provides an inclined grating with a guide inclined plate and a split rib applied to the water inlet of the cover body, and the purpose of this is to prevent safety accidents for pedestrians by allowing rainwater ejected during backflow caused by the rainy season or heavy rain to be discharged diagonally (smooth water drainage and effortless water discharge).

[0041] The purpose of the present invention is to provide a manhole cover that is formed with a large perforated hole compared to a conventional manhole cover (commonly referred to as a 'manhole lid,' but hereinafter collectively called a manhole cover) to facilitate the smooth inflow of rainwater and ensure high visibility, thereby allowing pedestrians and drivers to easily recognize the location or awareness of the manhole (ensuring pedestrian safety and driving safety), and in particular, to enable manhole workers to easily perform maintenance or replacement of the manhole cover (since the size or shape of the existing manhole is not changed, there is no problem with manhole work at all).

[0042] In addition, the present invention has a buffer bowl formed in the shape of a convex hemisphere facing downward on the bottom surface of a manhole cover to disperse the impact of rainwater surging vertically during backflow to the side (formed to withstand backflow water pressure) and discharge it through an inclined grating. This is intended to provide a method for effectively discharging water (rainwater) while reducing vertical water pressure by guiding a massive amount of water (rainwater) rising vertically during backflow caused by heavy rain toward the edge of the manhole cover and then having the inclined grating discharge it.

[0043] The purpose of the present invention is to provide a way to prevent the manhole cover from popping up and detaching from the manhole (upper opening) due to water pressure during backflow, thereby preventing secondary accidents that may cause impact to pedestrians or moving vehicles. means of solving the problem

[0044] To achieve the above-mentioned purpose, the present invention is configured such that a disc-shaped cover body (100: equipped with a separate handle) is detachably mounted to the upper opening of a manhole (1), and a plurality of diagonal gratings (200) arranged at equal intervals along the circumferential direction are provided (divided into 8 parts) on the surface of the cover body (100).

[0045] Accordingly, the diagonal grating (200) is provided with a guide inclined plate (220) having a slope at a certain angle in the penetrating inlet hole (210), and a plurality of divided ribs (230) are formed in a direction perpendicular to the guide inclined plate (220) to divide the width direction section of the inlet hole (210) into multiple sections and form a grid-shaped inlet hole together with the guide inclined plate (220).

[0046] In addition, the cover body (100) is formed with a buffer bowl (300) in the shape of a convex hemisphere facing downward in the center of the bottom surface to disperse the impact of rainwater surging vertically during backflow to the side (formed to withstand backflow water pressure) and guide it toward the inlet side of the diagonal grating. Effects of the invention

[0047] As such, the present invention has the effect of preventing safety accidents for pedestrians by allowing rainwater ejected during backflow caused by the rainy season or heavy rain to be discharged diagonally (smooth drainage and effortless water discharge).

[0048] Compared to conventional rainwater manhole covers (commonly referred to as 'manhole covers,' but hereinafter collectively called manhole covers), the present invention has the effect of facilitating the smooth inflow of rainwater by forming larger perforated holes.

[0049] Accordingly, the present invention has the effect of ensuring high visibility, allowing pedestrians or drivers to easily recognize the location or awareness of manholes (ensuring pedestrian and driving safety).

[0050] In addition, the present invention has the effect of enabling manhole workers to easily perform maintenance or replacement of manhole covers (since the size or shape of the existing manhole is not changed, there is no problem with manhole work at all).

[0051] In addition, the present invention has the effect of forming a buffer bowl in the shape of a convex hemisphere facing downward on the bottom surface of the manhole cover, which disperses the impact of rainwater surging vertically when rainwater backflows to the side (formed to withstand backflow water pressure) and allows the water to be discharged through an inclined grating.

[0052] Accordingly, the present invention has the effect of effectively discharging water (rainwater) while reducing vertical water pressure by guiding a massive amount of water (rainwater) rising vertically during backflow caused by heavy rain toward the edge of the manhole cover and then having the inclined grating discharge it.

[0053] The present invention has the effect of preventing the manhole cover from popping up and detaching from the manhole (upper opening) due to water pressure during backflow, thereby preventing secondary accidents that may cause impact to pedestrians or moving vehicles. Brief explanation of the drawing

[0054] FIG. 1 is a planar example showing a rainwater manhole cover equipped with an inclined grating according to the present invention. FIG. 2 is an exemplary diagram showing a rainwater manhole cover equipped with an inclined grating according to the present invention mounted on a manhole. FIG. 3 is a detailed example diagram showing a diagonal grating according to the present invention. FIG. 4 is an exemplary diagram showing a manhole cover equipped with a cushioning ball according to the present invention. FIG. 5 is an exemplary illustration of a rainwater manhole cover equipped with an inclined grating according to the present invention. FIG. 6 is an exemplary diagram showing a filter member mounted in the internal space of a manhole as an optional embodiment of the present invention. FIGS. 7 to 15 are exemplary diagrams showing examples of use and assembly relationships of a filter member according to the present invention. Figure 16 is a general example illustrating a pipeline system for rainwater or wastewater treatment. FIG. 17 is a general example illustrating a manhole cover assembled at the top opening of a manhole. Figure 18 is a general example illustrating the type of pedestrian accident that occurs when a manhole cover is dislodged. Specific details for implementing the invention

[0055] The present invention will be described in more detail below with reference to the attached drawings.

[0056] First, as illustrated in FIGS. 1 to 5, the present invention is configured such that a disc-shaped cover body (100: equipped with a separate handle) is detachably mounted to the upper opening of a manhole (1), and a plurality of diagonal gratings (200) arranged at equal intervals along the circumferential direction are provided (divided into 8 parts) on the surface of the cover body (100).

[0057] Accordingly, the diagonal grating (200) is formed such that a guide inclined plate (220) having a slope at a certain angle is provided in the penetrating inlet hole (210).

[0058] At this time, a plurality of dividing ribs (230) are formed in a direction perpendicular to the guide inclined plate (220) to divide multiple sections in the width direction of the inlet hole (210) and form a grid-shaped inlet hole together with the guide inclined plate (220).

[0059] For reference, in the case of backflow, the grid-type inlet does not discharge rainwater all at once through the inlet; instead, the amount of rainwater is dispersed, divided, or split by the grid-shaped guide inclined plates and dividing ribs, causing the backflowed water volume to scatter. This is to prevent excessive concentrated water pressure during backflow.

[0060] That is, the guide inclined plate (220) and the dividing rib (230) inserted into the inlet hole (210) are arranged in directions orthogonal to each other to form a checkerboard or grid shape.

[0061] In other words, the guide inclined plate (220) and the split rib (230) inserted into the inlet hole (210) are formed so that when backflow occurs, the amount of rainwater discharged is dispersed or divided in multiple directions through grid-shaped holes and discharged laterally above the ground.

[0062] This is intended to regulate the water pressure of backflowed rainwater so that it does not concentrate and discharge in one direction, thereby preventing harm to pedestrians.

[0063] And, the lower part of the guide inclined plate (220) is inclined so as to approach the center point (center point of the disc) of the cover body (100), and the upper part of the guide inclined plate (220) is inclined so as to approach the edge of the cover body (100), so as to form a cross-sectional shape of a '\' or a shape opposite to it (a funnel shape that is wider at the top and narrower at the bottom, opening from the center inside the manhole to the outside of the manhole, or a cross-sectional shape that is spread out in a trumpet shape), so that when rainwater flows back, the water does not surge upward in a vertical direction but flows out in the left and right directions.

[0064] Accordingly, the open shape of the water inlet (230) is formed such that when viewed from a planar view, the open area becomes wider as it extends toward the outer edge (edge ​​side) relative to the center point of the disc-shaped cover body (100), thereby facilitating rapid discharge (backflow drainage) through the edge side close to the ground when rainwater flows backward, and the backflow water is widely dispersed as it extends toward the edge so that the flow of rainwater flowing out spreads out widely—and is formed to perform the function of reducing water pressure as it flows backward closer to the circumferential surface of the cover body.

[0065] And, the cover body (100) is formed with a buffer bowl (300) in the shape of a convex hemisphere facing downward in the center of the bottom surface to disperse the impact of rainwater surging vertically during backflow to the side (formed to withstand backflow water pressure) and guide it toward the inlet side of the diagonal grating.

[0066] Meanwhile, the manhole (1) is a square box made of concrete blocks, and the manhole cover described above is detachably mounted on the upper opening, and a space (2: space for work and inspection) is formed inside, and a pipe (3) for transporting rainwater is formed to be connected to one side and the other side of the space.

[0067] At this time, a filter member (4) with a stacked structure is formed so that various plastic waste, cigarette butts, fallen leaves, and other waste (hereinafter referred to as 'contaminants') are collected in the space (2) of the manhole. (See FIGS. 6 to 15)

[0068] These filter members (4) are placed on the bottom of the space of the manhole and are formed to be collected when contaminants accumulate.

[0069] At this time, the outer surface of the filter member (4) is manufactured to have a size corresponding to the inner surface of the space portion of the manhole with a certain tolerance, but it is preferable to form it narrower than the diameter of the manhole cover so that it can be moved in and out through the upper opening of the manhole (to enable maintenance and replacement).

[0070] Accordingly, the filter member (4) is provided with a receiving plate (10) with an open top, and ventilation holes (30) in the form of a mesh, net, or cut are formed on the surface of the receiving plate and on the edge side plate (20) extending from the receiving plate. This is to allow rainwater to flow out smoothly while allowing contaminants to be removed.

[0071] For reference, the filter members are stacked and combined in multiple layers, and as the diameter of the ventilation holes narrows from the top layer to the bottom layer, relatively large contaminants (such as fallen leaves or plastic waste) are filtered in the upper filter members, and relatively small contaminants (such as cigarette butts) are filtered in the lower filter members.

[0072] In addition, a gap is formed (a water channel is formed) in the space between the upper and lower stacked filter members so that the drainage flow of rainwater is not obstructed, but the gap is formed to be narrower than the size of a cigarette butt so that the gap is maintained so that small filtered contaminants do not escape.

[0073] Accordingly, a bar-shaped insertion ledge (40) protruding upward is provided at the square corner portion of the support stand (10), and a stepped insertion groove (50) is formed on the outer surface of the support stand (10) so as to correspond to the insertion ledge (40) and be stacked vertically.

[0074] In other words, the purpose is to enable the filter elements to be stacked quickly and conveniently in a multi-stage form.

[0075] At this time, the receiving stand (10) is formed to further have a protruding rib strip (60) on its upper surface to prevent excessive sticking or adhesion of waste (see FIG. 10).

[0076] Additionally, as shown in FIG. 11, the base plate is formed to have reinforcing bar (70) in the form of a cross or grid on the bottom plate (to prevent bending or warping due to water).

[0077] Meanwhile, as shown in FIG. 12, the present invention is formed such that a pressing plate (42: the lower end of the insertion ledge is formed as a free end with the bottom separated from the step fitting groove) is formed by a cut-type slit groove (41) on one side of the insertion ledge (40), so that when pressed from the outside, easy removal (separation / smooth detachment from a tight fit) is possible from the lower insertion ledge.

[0078] That is, the pressing plate is capable of being pushed or pressed into the stepped fitting groove through the cut groove, and the inner surface of the pressing plate is formed to press against the upper inclined surface (43) of the insertion jaw and be released according to the pressing. This is to facilitate separation and collection of contaminated waste in the future.

[0079] In addition, as an optional embodiment as shown in FIGS. 13 to 15, the present invention is further provided with a continuous binding member (400) on the outer edge surface of the side plate so that the vertically stacked unit filter members (4) are bound together into a set to form a unit.

[0080] That is, multiple filter members stacked vertically are formed to be detachable by a continuous fastener (400: which induces a robust assembly, but enables rapid fixing work when stacking for detachment).

[0081] Accordingly, the continuous binding device (400) is composed of a fix holder (410), an opening / closing locker (420), and a link arm (430).

[0082] At this time, the fix holder (410) is a square prism and is formed so that the contact surface is joined to the outer circumference of one side surface (bottom part) of the holder (joined or attached to the lower side surface (bottom part) in the longitudinal direction of the outer circumference of the holder).

[0083] Accordingly, a screw tap (411) is formed on the outer surface of the outer exposed portion of the fix holder (410) so that a hinge bolt (440) can be fastened.

[0084] At this time, the opening / closing locker (420) has a rotating surface (423) formed on one side surface, having a rotating step (421: a part that contacts the outer surface of the insertion jaw to promote frictional rotation) and a screw fastening groove (422).

[0085] These opening and closing lockers are positioned near the upper surface of the outer circumference of the insertion jaw (the part that is touched when the link arm is maintained vertically) and are positioned adjacent to the fix holder (410), and are formed such that an insertion surface (425) having an open slit groove (424) is provided on the other side facing the rotation surface (423).

[0086] Accordingly, a fastening guide groove (426: the open slit groove (424) is connected to the fastening guide groove (426)) is formed inside between the insertion surface (425) and the rotation surface (423), and the open slit groove (424) is formed to have a narrower diameter (5~10%) than the fastening guide groove (426), and the link arm (430) is formed with a hinge hole (431) formed at one end in the longitudinal direction so that a hinge bolt (440) can be fastened to the screw tap (411) of the fix holder.

[0087] At this time, a pivoting roll (432) is formed at the other end of the longitudinal direction of the link arm (430), and the pivoting roll (432) is formed such that a disc locking member (434) is provided on one side of the shaft end of a small diameter (diameter smaller than the diameter of the open slit groove) hinge pin (433) and is larger than the diameter of the open slit groove and corresponds to the diameter of the fastening guide groove.

[0088] That is, when the link arm rotates relative to the hinge bolt of the fix holder, the rotating roll of the link arm is formed to be inserted into the opening slit groove of the opening / closing locker (maintaining an upwardly open state so that the rotating roll’s disc locker can enter as the link arm rotates) and the fastening guide groove through the hinge pin and the disc locking member (stable fastening is possible from rotation of 10° or more and 90° or more - when released, the opening / closing locker is lifted upward to remove the upper filter member, or conversely, the opening / closing locker is rotated downward to fasten and assemble).

[0089] Subsequently, when the open direction (upward direction) of the open slit groove is rotated sideways, the opening / closing locker and the link arm are connected based on the disc locking mechanism, and a one-touch locking mechanism is formed between the upper and lower hooks.

[0090] Accordingly, as the disc locking mechanism of the rotating roll is inserted into the fastening guide groove of the opening / closing locker, it is engaged by the narrow diameter of the open slit groove.

[0091] For reference, a screw fastening groove is formed in the rotating step so that it is filled and fixed to the outer circumference of the surface of the insertion step by a screw bolt (470).

[0092] In other words, this continuous binding device (400) ensures a strong binding force and disassembly capability compared to a simple release operation, thereby strengthening the mutual coupling between individual unit filter members and enabling storage and maintenance of the state within the space.

[0093] The present invention is not limited to the specific preferred embodiments described above, and anyone with ordinary knowledge in the art to which the invention pertains can make various modifications without departing from the essence of the invention as claimed in the claims, and such modifications will be within the scope of the claims. Explanation of the symbols

[0094] 1 ... manhole 100 ... cover body 200 ... diagonal grating 210 ... inlet 220 ... guide slope plate 230 ... split rib 300 ... cushioning ball

Claims

Claim 1 A rainwater manhole cover equipped with an inclined grating, characterized in that a disc-shaped cover body (100) is detachably mounted to the upper opening of a manhole (1), and a plurality of diagonal gratings (200) arranged at equal intervals along the circumferential direction are provided on the surface of the cover body (100). Claim 2 A rainwater manhole cover equipped with an inclined grating, wherein, in claim 1, the inclined grating (200) is provided with a guide inclined plate (220) having a slope at a certain angle in the penetrating inlet hole (210), and a plurality of divided ribs (230) are formed in a direction perpendicular to the guide inclined plate (220) to divide a plurality of widthwise sections of the inlet hole (210) and together with the guide inclined plate (220) form a grid-shaped inlet hole. Claim 3 A rainwater manhole cover equipped with an inclined grating, characterized in that, in the first paragraph, the cover body (100) has a buffer bowl (300) formed in the center of the bottom surface that is convex toward the downward direction, so as to disperse the impact of rainwater surging vertically during backflow to the side and guide it toward the inlet of the diagonal grating.

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