JP6916978B2 - Grating detachment prevention device - Google Patents

Description

The present invention relates to a grating retaining device for preventing grating fitted in a U-shaped groove on the side of a road, around a building, a water collecting port of a drainage channel installed in a park, or the like.

Conventionally, gratings are detachably installed at the groove lids of drainage channels such as U-shaped grooves used for gutters of roads and the openings of water collecting basins.

In addition, a lightweight plastic pipe such as a vinyl chloride pipe is used for the drainage channel, and a narrow water bottle is vertically connected to the upper surface of the lightweight pipe, and the water bottle is connected to the upper surface of the lightweight pipe. It is known that rainwater or the like flows into the drainage channel through an open intake port, and an elongated grating of a size suitable for this is detachably fitted in the opening of the water bottle. (See, for example, Patent Document 1).

On the other hand, in this type of grating, when a vehicle passes over the grating, it may be lifted by the impact and may come off from the grating receiving frame. Therefore, it can be fixed to the grating receiving frame so that it does not come off from the grating receiving frame. Is also known.

As a means for preventing the grating from coming off, a method of fixing the grating to the frame-shaped creating receiving frame embedded in the groove lid or the opening of the water collecting basin by using bolts is common, but the grating is inside the grating receiving frame. A grating detent device with a structure that automatically prevents decoupling by fitting it into is also being developed.

In this type of grating retaining device, the retaining claws are urged to the grating in the pushing direction by a spring, and the grating receiving frame is formed with a claw holder having a shape in which the retaining claws enter the lower side. , A structure is known in which the retaining claw is pushed by the ratchet structure by the fitting of the grating so that it protrudes downward at the position where it passes through the claw receiving portion (see, for example, Patent Document 2). ).

Furthermore, in recent years, theft of metal products such as grating has increased, and in this type of grating, in addition to the above-mentioned anti-disengagement means, anti-theft measures are required, for example, fixing using a special nut. Measures such as this have been taken (see, for example, Patent Document 3).

Japanese Unexamined Patent Publication No. 2009-243185 Utility Model Registration No. 3192428 Japanese Unexamined Patent Publication No. 2009-299376

The narrow grating as shown in Patent Document 1 described above is often installed mainly in a part other than the roadway, for example, around a building site or other open space or on a sidewalk, and is not impacted by the passage of a vehicle. Therefore, the retaining device was not used.

However, in recent years, the weight of this type of grating has been reduced, and there is a possibility that the grating may be lifted even with a small impact, and a means for preventing the grating from coming off is required even in this type of narrow grating.

On the other hand, the grating retaining device shown in Patent Document 2 has a complicated structure, and in order to reduce the size so that it can be used for narrow grating, it is restricted by conditions such as the strength of the material and exceeds a certain level. It is difficult to miniaturize it, and it is easily corroded because it is exposed to rainwater and, in some cases, an antifreeze material, and there is a problem in durability.

Further, in the conventional grating detachment prevention device, it is often possible to release the fixed state of the grating with respect to the grating receiving frame relatively easily without using a special tool, which is insufficient as a countermeasure against theft.

Further, in the anti-theft structure using a special nut as shown in Patent Document 3, since the nut is exposed on the ground surface side, it may be removed by using a general-purpose tool or the like, which is insufficient as an anti-theft measure. rice field. On the other hand, when removing the grating for maintenance and inspection, there is a problem that the work is complicated because the grating cannot be removed unless the nut is removed using a special jig.

In view of such conventional problems, the present invention has been made to provide a grating retaining device that can be applied to narrow gratings, has a simple structure, has excellent durability, and can prevent theft. It is a thing.

The feature of the invention according to claim 1 for solving the above-mentioned conventional problem is that a glazing having a plurality of main members arranged in parallel with each other and a glazing arranged in an opening opened on the ground surface are provided. In a graching stopper device having a water collecting port provided with a graching receiving frame to be fitted and having the graching prevented from coming off with respect to the grating receiving frame, the grating is arranged under the fitted grating. It has a hook engaging body fixed to the graching receiving frame and a hook portion whose upper end is rotatably supported between the main members via a support shaft and enters and engages under the hook engaging body. A hook member urged on the hook engaging body side and a key / detachable tool for detaching the hook portion from the hook engaging body are provided, and the hook portion is provided when the hook portion enters under the hook engaging body. It is provided with an engaging hole arranged at an arbitrary position hidden under the hook engaging body, and the key / detachable tool is fixed to a rod-shaped insertion portion inserted between the main members and a predetermined position of the insertion portion. A height-determining member that is fixed to the upper surface of the main member and a key portion that protrudes outward from the insertion portion are provided, and the graching is provided with a main member arranged outside the hook member. The insertion portion is inserted between the main member and the adjacent main member in a state in which the insertion portion can be slid in the horizontal direction, and the insertion portion that slides between the main members is provided with a horizontal positioning member to which the insertion portion is held against. ,
The key portion of the engaging hole is formed by rotating the insertion portion in a state where the height determining member is pressed against the upper surface of the main member and the insertion portion is pressed against the horizontal positioning member. The hook member is brought into contact with the inner edge, rotated in the lifting direction, and inserted into the engaging hole under the main member.

The feature of the invention according to claim 2 is that, in addition to the configuration of claim 1, the grating includes a lifting support that is fixed between the main members and that the hook member lifted from below the hook engaging body comes into contact with the hook member. It is intended to be supported by the key / detachable tool via the lifting support and the hook member.

A feature of the invention according to claim 3 is that, in addition to the configuration of claim 1 or 2, the support shaft forms the horizontal positioning member.

The feature of the invention according to claim 4 is that, in addition to the configuration of any one of claims 1 to 3, the key / detachable tool is provided with a hook / handle at the upper end.

The feature of the invention according to claim 5 is that, in addition to the configuration of any one of claims 1 to 4, a locking spacer fitted between the grating upper surface and the height determining member is provided.

A feature of the invention according to claim 6 is that, in addition to the configuration of claim 5, the locking spacer is provided with a spring portion that can be expanded and contracted in the axial direction of the insertion portion.

The grating detachment prevention device according to the present invention is provided with the configuration according to claim 1, so that the hook portion is automatically engaged with the hook by the rotational moment due to the weight of the hook member simply by fitting the grating into the grating receiving frame. Since it goes under and the retaining state is maintained, it is possible to prevent the grating from jumping up due to the passage of vehicles. Further, in this grating disengagement prevention device, since the hook portion and the engagement hole are hidden at an arbitrary position under the hook engagement body in the disengagement prevention state, the position of the engagement hole cannot be grasped and a predetermined position is determined. Without using the key / detachment tool, the hook member cannot be separated from the hook engaging body, and cannot be illegally removed for the purpose of theft or the like.

Further, in the present invention, by providing the configuration according to claim 2, when the grating is lifted, it can be stably supported.

Further, in the present invention, by providing the configuration according to claim 3, the number of parts can be suppressed and the cost can be reduced.

Further, in the present invention, by providing the configuration according to claim 4, the grating can be lifted by a crane or the like when it is lifted.

Furthermore, in the present invention, by providing the configuration according to claims 5 to 6, it is possible to maintain a state in which the hook member is lifted and a state in which the hook member is fixed to the key / detacher for grating, which is safe and efficient. Grating can be attached and detached.

It is a top view which shows 1st Example of the grating detachment prevention device of the drainage channel which concerns on this invention. It is a vertical sectional view of the same as above. It is an enlarged plan view of the grating detachment prevention device part of the same as above. It is the same vertical sectional view. It is a schematic cross-sectional view which shows the procedure of the release operation of the grating detachment prevention device of the same as above, (A-1) is the insertion operation of the key and attachment / detachment device, and (B-1) is the slide movement operation of the same key / attachment / detachment device. It is a figure which shows. It is a top view corresponding to FIG. It is a schematic cross-sectional view which shows the procedure of the release operation of the grating detachment prevention device of the same as above, (C-1) is the rotation operation of the key and attachment / detachment device, and (D-1) is the same key / attachment / detachment and the hook member. It is a figure which shows the engagement state. It is a plan view corresponding to FIG. 7. It is a schematic cross-sectional view which shows the procedure of the release operation of the grating detachment prevention device of the same as above, (E) shows the state which the grating is supported by the key / attachment / detacher, and (F) shows the state which the spacer for the lock is attached. It is a figure. It is a vertical cross-sectional view which shows the state at the time of lifting of the grating of the same above. It is a top view which shows the 2nd Example of the grating detachment prevention device which concerns on this invention. It is a vertical sectional view of the same as above. It is a vertical cross-sectional view which shows the state at the time of lifting the grating of the same above.

Next, the first embodiment of the grating detachment prevention device according to the present invention will be described with reference to FIGS. 1 to 10.

In this embodiment, a narrow grating with a total width of about 30 to 50 mm used for the narrow water collecting port 1 installed in the drainage channel will be described as an example. In the figure, reference numeral 1 is a water collecting port and reference numeral 2 is a water collecting port. It is a grating that is fitted into the water collecting port 1.

The water collecting port 1 includes a frame-shaped grating receiving frame 3 fixed to an opening on the ground surface side and a grating 2 fitted into the grating receiving frame 3, and the grating 2 is held by the grating receiving frame 3 by a retaining device. There is.

The grating receiving frame 3 is formed of a narrow rectangular frame having an open upper surface made of stainless steel or the like, and a plurality of grating support bars 4, 4 ... Are erected between side plates 3a, 3a facing each other in the width direction. It is provided at intervals.

Both ends of the grating support bars 4, 4 ... Are formed in a plate shape having a constant width fixed to the side plate, and the lower surface of the grating 2 is supported on the upper surface thereof, so that the downward load on the grating 2 is dispersed. Therefore, the thickness (beam back) of the grating 2 can be reduced to make it lighter.

The grating 2 has a plurality of elongated plate-shaped main members 5, 5 ... Arranged in parallel at predetermined intervals with the width direction facing up and down, and the grating 2 is arranged orthogonally to the main members 5, 5 ... It is provided with rod-shaped crossbars 6, 6 ... Through which the main members 5, 5 ... Are connected by the crossbars 6, 6 ....

The grating disengagement prevention device includes a hook engaging body 4A fixed to the grating receiving frame 3 and a hook member 8 whose upper end is rotatably supported between the main members 5, 5 of the grating 2 via a support shaft 7. By fitting the grating 2 into the grating receiving frame 3, the hook member 8 automatically engages with the hook engaging body 4A by the rotational moment due to its own weight, and the grating 2 is prevented from coming off from the grating receiving frame 3. ing.

Further, this grating disengagement prevention device is provided with a key / detachable tool 9 for lifting the grating 2, and the hook member 8 is rotated in the lifting direction by the key / detachable tool 9 to be detached from the hook engaging body 4A and the key. By supporting the grating 2 on the combined attachment / detachment tool 9, the grating 2 can be removed from the grating receiving frame 3.

The hook engaging body 4A is erected between the side plates 3a and 3a of the grating receiving frame 3 facing each other in the width direction, and is arranged under the fitted grating 2. In this embodiment, the grating support bars 4, 4, ... Of the grating receiving frame 3 are also used as the hook engaging body 4A.

The hook member 8 is integrally formed by processing a steel plate having a thickness slightly thinner than the gap between the main members 5 and 5, and is integrally formed between the main members 5 and 5 arranged in the center of the grating 2 via the support shaft 7. It includes a bearing portion 10 that is supported, a hook portion 11 that is below the bearing portion 10 and enters and engages under the hook engaging body 4A, and a connecting support portion 12 that connects the bearing portion 10 and the hook portion 11.

The support shaft 7 is formed in a round bar shape, is penetrated in an orthogonal arrangement with respect to the main members 5, 5 ... Over a plurality of main members 5, 5 ... It has become.

The bearing portion 10 is formed in a circular shape, a through hole 10a penetrates in the center thereof, and both ends of the support shaft 7 passing through the through hole 10a are supported by both main members 5, 5 ... 8 is rotatably supported between the main members 5, 5 ...

The connecting support portion 12 is arranged so as to be offset to one side in the rotation direction of the bearing portion 10, and the hook portion 11 is integrally supported on the hook engaging body 4A side in the rotation direction, so that the hook member 8 is rotated in the rotation direction. A notch 8a is formed at the leading edge, the notch 8a fits into the hook engaging body 4A, and the hook portion 11 fits under the hook engaging body 4A.

The hook portion 11 is formed in a flat plate shape having a constant weight, and has an engaging surface 11a that engages with the lower surface of the hook engaging body 4A on its upper edge.

The hook portion 11 also functions as a weight for urging the hook member 8 toward the hook engaging body 4A, and the shape thereof is not particularly limited, but a rectangular shape, a trapezoidal shape, a fan shape, or the like is appropriately selected. As a result, the position of the center of gravity is adjusted so that the hook portion 11 is always urged toward the hook engaging body 4A by the rotational moment around the support shaft 7 due to its own weight.

Although not particularly shown, the engaging surface 11a has a large number of ridges having a chevron-shaped cross section in a direction orthogonal to the rotation direction of the hook member 8, that is, a direction parallel to the thickness direction of the hook member 8. It may be formed in a continuous arrangement so that the ridges are engaged with the edge of the hook engaging body 4A in the disengagement state.

Further, as shown in FIG. 3, the hook portion 11 is provided with an engaging hole 13 of an arbitrary size arranged at an arbitrary position hidden under the hook engaging body 4A when entering under the hook engaging body 4A. The hook member 8 can be rotated by engaging the key / detachable tool 9 with the engaging hole 13 according to a predetermined operation.

The key / detachable tool 9 has a rod-shaped insertion portion 20, a height-determining member 21 fixed at a predetermined position of the insertion portion 20 and fixed to the upper surface of the grating 2, and a height determination on the lower end side of the insertion portion 20. A key portion 22 protruding outward is provided at a position separated from the member 21 by a predetermined distance.

Further, a hook-combined handle 23 is provided at the upper end of the key-combined attachment / detachment tool 9, and the hook-combined handle 23 can be gripped so that the grating 2 can be attached / detached. The handle may not have a hook function.

On the other hand, in the grating 2, the insertion portion 20 is inserted into the gap 24 between the main member 5 located outside the hook member 8 and the adjacent main member 5 in a horizontally slidable state, and is also inserted into the grating 2. A horizontal positioning member 7A to which the insertion portion 20 sliding in the gap 24 between the members is fixed is provided, and the key / detachable tool 9 is engaged with the engagement hole 13 through the gap 24 between the main members 5 and 5. It is designed to be able to be made to. In this embodiment, a part of the support shaft 7 forms the horizontal positioning member 7A.

The insertion portion 20 is formed in the shape of a round bar slightly thinner than the gap between the main members 5 and 5 by a rigid member such as a steel rod, the height determining member 21 is fixed to the upper end thereof, and the key portion 22 is attached to the lower end. It is projected in one piece.

The height determining member 21 is formed in a rod shape, a nut shape, or a flange shape having an outer diameter larger than the diameter of the insertion portion 20, and the lower end surface is pressed against the upper surfaces of the main members 5 and 5 of the grating 2, and the insertion portion 20 is formed. The lower end (key portion 22) of the above can be positioned at a predetermined height below the grating 2.

That is, the insertion portion 20 under the height determining member 21 extends from the upper surface of the grating 2 to the engagement hole 13 in a state where the hook portion 11 is engaged with the hook engaging body 4A (hereinafter, referred to as a retaining state of the grating 2). The key portion 22 is the same as the engaging hole 13 in a state where the height determining member 21 is formed to have substantially the same length as the vertical distance H and is pressed against the upper surface of the grating 2 (the upper surface of the main members 5, 5 ...). I try to be high.

The key portion 22 is formed in a shape in which the tip of the insertion portion 20 is bent in the vertical direction, and forms an L shape together with the insertion portion 20.

The key portion 22 is formed so as to match the position and size of the engaging hole 13, the height determining member 21 is pressed against the upper surface of the grating 2, and the insertion portion 20 is pressed against the horizontal positioning member 7A. When the insertion portion 20 is rotated in this state (hereinafter referred to as an operable state), it comes into contact with the inner edge 13b of the engagement hole 13 without interfering with the surface of the hook portion 11.

That is, the key portion 22 has an outer diameter that can be inserted into the engaging hole 13, and is engaged with the engaging hole 13 in the retaining state of the grating 2 on the side far from the center of the insertion portion 20 in the operable state. It is formed to be shorter than the distance to the opening edge 13a of the hole 13 and longer than the opening edge 13b of the engaging hole 13 on the closer side.

Therefore, by rotating the insertion portion 20 in the operable state, the key portion 22 comes into contact with the opening edge portion 13b on the side of the engagement hole 13 near the center of the insertion portion 20 under the main member 5, and the hook member 8 Is rotated in the lifting direction, and is inserted into the engaging hole 13 accordingly.

Then, when the key portion 22 is inserted into the engaging hole 13, the central axis of the key portion 22 moves to the grating 2 side with respect to the support shaft 7. Therefore, by pulling up the key / detachable tool 9 upward from that state. The hook member 8 can be rotated to separate the hook portion 11 from the hook engaging body 4A.

Further, when the key / detachable tool 9 is pulled up, the hook member 8 rotates, the key portion 22 comes into contact with the lower surface of the main member 5, and the entire grating 2 is supported by the key / detachable tool 9.

Further, the hook member 8 comes into contact with the lifting support 6A as it rotates, and the grating 2 is supported by the key / detachable tool 9 via the lifting support 6A and the hook member 8. In this embodiment, the crossbar 6 constitutes the lifting support 6A.

Therefore, at least, the grating 2 is supported by the key / detachable tool 9 when the key portion 22 is in contact with the lower surface of the main member 5 or the hook member 8 is in contact with the lifting support 6A. In this state, the grating 2 can be lifted from the grating receiving frame 3 by holding the key / detachable tool 9.

Further, the grating disengagement prevention device is fitted between the upper surface of the grating 2 and the height determining member 21 at a position where the key portion 22 abuts on the lower surface of the main member 5 or a position where the hook member 8 abuts on the lifting support 6A. As shown in FIGS. 9 (F) and 10 (F), the locking spacer 25 is provided, and by fitting the locking spacer 25 between the upper surface of the grating 2 and the height determining member 21, the grating 2 can be attached / detached as a key. The state supported by the tool 9 is maintained.

The lock spacer 25 is provided with a spring portion that can be expanded and contracted in the 20-axis direction of the insertion portion, and is adapted to urge the key / detachable tool 9 upward.

The mode of the locking spacer 25 is not particularly limited, but for example, as in the present embodiment, a notch 26 formed in a C-shaped leaf spring by a flexible plate material and opened on the curved portion side thereof. Make the shape provided.

In the grating disengagement prevention device configured in this way, when the grating 2 is fitted in the grating receiving frame 3, as shown in FIG. 3, the hook portion 11 is fitted under the hook engaging body 4A due to the rotational moment due to its own weight. Including, the grating 2 is in a state of being prevented from coming off by the grating receiving frame 3.

At that time, since the hook portion 11 and the engaging hole 13 are in a hidden state at an arbitrary position under the hook engaging body 4A (grating support rails 4, 4 ...), The position of the engaging hole 13 can be grasped. Therefore, the hook member 8 cannot be operated.

That is, this grating detachment prevention device can disengage the hook member 8 from the hook engaging body 4A only when a predetermined key / detachable tool 9 is used, and is illegally removed for the purpose of theft or the like. It is not possible to do it.

To remove the grating 2, first, as shown in FIGS. 5 (A-1) and 6 (A-2), the insertion portion 20 is moved upward with the key portion 22 facing parallel to the surface of the hook member 8. Is inserted into the gap 24 between the main members 5 and 5, and the height determining member 21 is brought into contact with the upper surface of the grating 2 (main members 5, 5 ...).

Next, from that state, as shown in FIGS. 5 (B-1) and 6 (B-2), the insertion portion 20 is guided by the main members 5 and 5 until it is pressed against the horizontal positioning member 7A. It is slid so that the height determining member 21 is pressed against the upper surface of the grating 2 and the insertion portion 20 is pressed against the horizontal positioning member 7A, that is, an operable state.

Then, as shown in FIGS. 7 (C-1) and 8 (C-2), when the hook / handle 23 is rotated in the operable state and the insertion portion 20 is rotated around the axis thereof, the main member is accompanied by the rotation. The key portion 22 rotates under 5 and comes into contact with the opening edge portion of the engagement hole 13 of the hook member 8.

Further, as shown in FIGS. 7 (D-1) and 8 (D-2), when the hook / handle 23 is turned and the insertion portion 20 is further rotated, the hook member 8 is pushed by the key portion 22 to rotate. As it moves, the key portion 22 is inserted into the engaging hole 13 under the main member 5.

Further, as the hook member 8 rotates, the position of the key portion 22 that supports the hook member 8 moves to the outside of the support shaft 7. Therefore, the hook member 8 can be lifted by pulling up the key / detachable tool 9 upward. It can be rotated.

In the work of inserting the key portion 22 into the engaging hole 13, the hook portion 11 and the engaging hole 13 are hidden at arbitrary positions under the hook engaging body 4A (graching support bars 4, 4 ...). Although the position of the engaging hole 13 cannot be grasped, the position and length of the key portion 22 of the predetermined key / detachable tool 9 are properly set with respect to the engaging hole 13 in the operable state. The positional relationship between the engaging hole 13 and the key portion 22 can be operated without visually observing.

Then, as shown in FIG. 9E, by pulling up the key / detachable tool 9 upward, the hook member 8 rotates, the hook member 8 comes into contact with the lifting support 6A, and the key portion 22 is mainly used. The grating 2 comes into contact with the lower surface of the member 5 and is supported by the key / detachable tool 9.

Next, as shown in FIG. 9F, the locking spacer 25 is fitted between the upper surface of the grating 2 and the height determining member 21, and the key / detachable tool 9 is lifted by the hook member 8 and hits the support 6A. It is fixed at a position where the key portion 22 is in contact with the lower surface of the main member 5.

In this state, the grating 2 is lifted from the grating receiving frame 3 by holding the hook-combined handle 23 and pulling up the key-combined attachment / detachment tool 9 as shown in FIG.

Since the grating 2 is narrow and lightweight, it can be manually transported while holding the hook / handle 23. Further, by connecting a lifting wire to the hook / handle 23, it is possible to carry the vehicle using a crane vehicle or the like.

On the other hand, in this grating detachment prevention device, even when the grating 2 is installed in the grating receiving frame 3, if the key / detacher 9 is used, the handle located at a position protruding from the upper surface of the grating 2 can be grasped to facilitate the fitting operation. It can be carried out.

Then, after the grating 2 is fitted into the grating receiving frame 3, the series of operations shown in FIGS. 5 to 10 is performed in the reverse procedure to obtain the grating 2 disengagement state shown in FIGS. 3 and 4.

That is, after the grating 2 is fitted into the grating receiving frame 3, the lock spacer 25 is removed, and from that state, the hook / detachable handle 23 is grasped and the key / detachable tool 9 is lowered, while the hook / detachable handle 23 is turned to the insertion portion. By rotating 20 and disengaging the key portion 22 from the engaging hole 13, the hook member 8 automatically moves to the hook engaging body 4A side by the rotational moment due to its own weight, and the hook portion 11 engages with the hook engaging body 4A. In addition, the grating 2 is in a state of being prevented from coming off.

The aspect of the grating detachment prevention device according to the present invention is not limited to the above-described embodiment, and is described in the first embodiment as a U-shaped groove or a lid of a water collecting basin, for example, as shown in FIGS. 11 to 13. It can also be applied when used for a wider grating 2A. The same parts as those in the first embodiment are designated by the same reference numerals, and duplicate description will be omitted.

In this example, the hook member 8 is rotatably supported at the four corners of the rectangular grating 2A.

The hook member 8 is the same as that of the first embodiment, but the hook engaging body 4A to which the hook member 8 is engaged is used as a frame-shaped frame portion of the grating receiving frame 3, and the hook portion 11 of the hook member 8 is used. The upper surface of the hook portion 11 is engaged with the lower side of the inner peripheral edge of the frame portion by entering under the inner peripheral edge portion of the frame portion of the grating receiving frame 3.

In the hook engaging body 4A, a profile (not shown) is installed under the frame when the concrete portion for embedding the grating receiving frame 3 is placed, and the profile is removed after the concrete is solidified. It can be formed by providing a space under the frame portion into which the hook portion 11 can enter.

In the grating 2A, if the key / detacher 9 is attached to each hook member 8, as shown in FIG. 13, the hanging wire 30 is connected to the hook / handle 23 of the key / detacher 9, and the crane is used. It is possible to easily carry out the transporting and fitting work by using the above.

1 Water collection port 2 Grating 3 Grating receiving frame 4 Grating support rail 4A Hook engaging body 5 Main member 6 Crossbar 7 Support shaft 8 Hook member 9 Key combined attachment / detachment 10 Bearing part 11 Hook part 12 Connecting support part 13 Engagement hole 20 Insertion part 21 Height determining member 22 Key part 23 Hook combined handle 24 Key insertion part 25 Lock spacer 26 Notch part

Claims (6)

In a water collecting port having a grating having a plurality of main members arranged in parallel with each other and a grating receiving frame arranged in an opening opened on the ground surface and into which the grating is fitted, the grating is provided with respect to the grating receiving frame. In the grating detachment prevention device that is designed to prevent it from coming off
With the hook engaging body fixed to the grating receiving frame so as to be arranged under the fitted grating,
A hook whose upper end is rotatably supported between the main members via a support shaft, has a hook portion that enters and engages under the hook engaging body, and is urged toward the hook engaging body side by its own weight. Members and
A key-combined attachment / detachment tool for detaching the hook portion from the hook engaging body is provided.
The hook portion is provided with an engaging hole arranged at an arbitrary position so as to be hidden under the hook engaging body when entering under the hook engaging body.
The key-combined attachment / detachment tool has a rod-shaped insertion portion inserted between the main members, a height-determining member fixed at a predetermined position of the insertion portion and fixed to the upper surface of the main member, and the insertion. Equipped with a key part that protrudes outward from the part,
The grating is inserted between the main member arranged outside the hook member and the main member adjacent to the main member in a state in which the insertion portion is slidable in the horizontal direction, and between the main members. With a horizontal positioning member to which the insertion portion for sliding the
The key portion of the engaging hole is formed by rotating the insertion portion in a state where the height determining member is pressed against the upper surface of the main member and the insertion portion is pressed against the horizontal positioning member. A grating disengagement prevention device that comes into contact with an inner edge, rotates the hook member in the lifting direction, and is inserted into the engaging hole under the main member. It is provided with a lifting support fixed between the main members and with which the hook member lifted from below the hook engaging body abuts, and the grating is supported by the key / detachable tool via the lifting support and the hook member. The grating detachment prevention device according to claim 1. The grating disengagement prevention device according to claim 1 or 2, wherein the support shaft forms the horizontal positioning member. The grating detachment prevention device according to any one of claims 1 to 3, wherein the key / detachable tool has a handle that also serves as a hook at the upper end. The grating retaining device according to any one of claims 1 to 4, further comprising a locking spacer fitted between the grating upper surface and the height determining member. The grating disengagement prevention device for a drainage channel according to claim 5, wherein the locking spacer is provided with a spring portion that can be expanded and contracted in the axial direction of the insertion portion.

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