JP3741985B2 - Fall prevention frame for underground structures - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention has a frame main body having a size that substantially covers an opening of a lid receiving frame provided in an underground structure, and an engagement member provided at an end for fixing the frame main body, and is relatively small. The present invention relates to a fall prevention frame suitable for the opening.
[0002]
[Prior art]
Conventionally, this type of fall prevention frame is mainly used for manhole iron lids (φ600 or more), and prevents people and objects from dropping into the opening of the underground structure, and also serves as a ladder when moving up and down. Many of them are disclosed in Japanese Patent Laid-Open No. 2001-32305, Japanese Patent No. 3107373, and the like. Some of the openings in underground structures are called handholes with smaller diameters than manholes, and these are often 300-400 mm in diameter. In adults, the whole body will not fall, but in the case of children There is plenty of possibility. Since the lid receiving frames having openings with smaller diameters are low in cost, the number of lid receiving frames has increased gradually in recent years, and measures to prevent accidents are desired.
[0003]
However, since many conventional anti-fall frames for manholes also have a structure that doubles as an elevating ladder, it is difficult to reduce the size and use it as it is. There is no lack of a manhole fall prevention frame that does not serve as an elevating ladder. For example, a net that covers the opening with a net, such as a grilled net, is commercially available. This net type is troublesome to attach and detach because it is fixed to the lid receiving frame by the surrounding frame, and there is a concern that the strength is insufficient when the diameter is reduced.
[0004]
[Problems to be solved by the invention]
The present invention has been made paying attention to the above points, and its problem is that it can be supplied at a low cost so as to be suitable for a smaller-sized lid receiving frame, and can be easily attached to and detached from the lid receiving frame and is expected to have sufficient strength. It is to provide a fall prevention frame for underground structures.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, in the fall prevention frame of the present invention, the engaging member is combined so as to be movable outward of the frame body and urged outward by the elastic member. The opening has a lower flange portion, an upper flange portion, and a recessed portion between both flange portions that are provided over the entire circumference, and the frame body and the engaging member enter and engage with the recessed portion. A measure is taken to configure the state.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The fall prevention frame of the present invention has a frame main body having a size that substantially covers the opening of the lid receiving frame provided in the underground structure, and an engagement member provided at the end for fixing the frame main body. The size that almost covers the opening means that the opening can be covered only by the frame body, and that no other member is required for the purpose of covering the opening. is there. Therefore, the engaging member is provided for fixing the frame body. Such a configuration is suitable for relatively small openings.
[0007]
The engaging members are combined so as to be movable outward of the frame main body and biased outward by the elastic members. The outside of the frame main body includes not only the meaning of the outside of the frame main body but also the meaning of a location located outside the center portion in the frame main body. Therefore, the engaging member may not protrude from the frame body or may protrude. In this state, the engaging member and the frame main body are combined, and the engaging member is biased outward of the frame main body.
[0008]
The lid receiving frame has a flange portion extending almost entirely around the inside of the opening. This flange portion is composed of a lower flange portion and an upper flange portion, and has a recessed portion between the upper and lower flange portions. ing. That is, the recessed portion is a substantially ring-shaped space in which the upper and lower portions are each partitioned by the flange portion and the outer side is partitioned by the outer peripheral portion of the lid receiving frame, and is open only inward. In this recessed portion, the frame main body and the engaging member enter into an engaged state, in other words, the engaging member is combined with the frame main body by an elastic member in order to be in the engaged state. .
[0009]
The frame main body has two side bars on the left and right sides and at least two side bars on which the both side hooks are coupled. The double-sided ridge includes a form in which both ends have a length that goes into the recessed portion across the opening of the lid receiving frame. In this case, a passage portion is formed in the upper flange portion so as to pass the front end portion of the side rod, and an engagement member can be engaged with the upper flange portion on the side of the passage portion from below to prevent the passage portion from coming out. can do.
[0010]
Further, the engaging member has a substantially U-shaped cross-sectional shape that is bent so as to hold the left and right side rods, and overlaps with the frame main body even when moved outward of the frame main body. The external force applied to the engaging member can be transmitted to the frame body as it is. According to this configuration, the engaging member always has sufficient strength to overlap the side rod, and in that state it receives external force, for example, the load of the person who stepped into the opening, so the external force is transmitted to the frame body as it is, and a simple structure But hard to break.
[0011]
【Example】
Hereinafter, the present invention will be described in more detail with reference to the illustrated embodiments. The lid receiving frame 10 for an underground structure shown in FIG. 1 and FIG. 2 has an opening 11 having a diameter of 300 mm to 400 mm, and an upper flange portion 12, a lower flange portion 13, and both flanges are provided in the opening. A recessed portion 14 between the portions is provided. The upper flange portion 12 is a portion for providing a receiving piece 15 that supports and supports the iron lid, the lower flange portion 13 is an inwardly extending portion of the mounting seat 16, and the recessed portion 14 is a space between them. Since the lid receiving frame 10 has been provided for a long time, it is necessary to newly provide the upper flange portion 12, the lower flange portion 13 or the recessed portion 14 when the lid receiving frame 10 having this type of structure is applied. There is no.
[0012]
The frame main body 20 of the fall prevention frame has a length in which both ends traverse the opening 11 of the lid receiving frame 10 and enter the recessed portion 14 between the lower flange portion 13 and the upper flange portion 12. It has ridges 21 and 22 and at least two horizontal ridges 23 and 24 joined to both ridges 21 and 22. The front end portions 21a and 22a and the base end portions 21b and 22b of the left and right side rods 21 and 22 are arranged below the upper flange portion 12, and for this purpose, the passage portions through which the front end portions 21a and 22a pass. 25 and 26 are formed in the upper flange portion 12 in a cutout shape (see FIG. 3).
[0013]
The engaging members 31 and 32 for entering into the recessed portion 14 to be in an engaged state have a substantially U-shaped transverse shape bent so as to hold the left and right side rods 21 and 22 and the frame body 20. A long guide hole 33 is provided in the front-rear direction through which the horizontal rod 23 is passed, and is movable in the longitudinal direction of the side rods 21 and 22 within the range of the guide hole 33 (FIG. 4). The engaging members 31 and 32 are further constantly urged outward by using a compression spring having one end hung on the above-mentioned lateral flange 23 and the other end on the inner end 34 of the engaging members 31 and 32 as an elastic member 35. ing. The inner ends 34 of the engaging members 31 and 32 are also used as finger hooks when the engaging members 31 and 32 are retracted.
[0014]
Further, a part 28 is removed inward of the side position 27 of the passing portions 25 and 26 to which the front ends of the engaging members 31 and 32 can be engaged. This reduces the amount of operation of the engaging members 31, 32. In the figure, 36 and 36 'are guide ribs that define the locations where the base end portions 21b and 22b of the frame body 20 are accommodated, and 37 is a coupling chain that connects the frame body 20 to the lid receiving frame 10.
[0015]
In order to attach the fall prevention frame for an underground structure according to the present invention to the lid receiving frame 10, the rear end portions 21b and 22b of the frame body 20 are inserted into the recessed portions 14 and 14 between the guide ribs 36 and 36 ', and the front end portion 21a, When the member 22a is tilted over the passage portions 25 and 26, the engaging members 31 and 32 come in contact with the lateral positions of the passage portions 25 and 26, so that the inner ends 34 of the engagement members 31 and 32 are pulled backward (FIG. 1). (Arrow), once retracted, place the tip of the fall prevention frame on the lower flange and then release. At this time, the distal end portions 21a and 22b are placed on the lower flange 13, and the engaging members 31 and 32 are disposed below the upper flange portions at the side positions 27 and 27 of the passage portions 25 and 26, so It becomes a state in which it cannot move in any of the left, right, up and down directions. Moreover, even if pressure in the underground structure acts, it will withstand it and will not be removed.
[0016]
When removing the fall prevention frame, the inner ends 34 and 34 of the engaging members 31 and 32 are pulled rearward (FIGS. 3 and 4), and the engaging members 31 and 32 from below the side positions 27 and 27 are drawn. The base end portions 21b and 22b may be pulled out after the front end portions 21a and 22a of the frame main body 20 are raised on the upper flange portion 12. Thus, the fall prevention frame according to the present invention is easy to attach and detach. In addition, the fall prevention frame itself can be constituted by two side rods 21 and 22 and horizontal rods 23 and 24, and is prevented from coming off by engaging members 31 and 32 integral with the side rods 21 and 22. Therefore, it is easy to manufacture with a strong structure.
[0017]
【The invention's effect】
Since the present invention is configured and operates as described above, it can be supplied at a low cost and is therefore suitable for a lid receiving frame having a smaller diameter, and can be easily attached to and detached from the lid receiving frame and is less likely to come off after being attached. There exists an effect that a useful fall prevention frame can be provided.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a fall prevention frame for an underground structure according to the present invention.
2 is a cross-sectional view taken along the line II-II of FIG.
FIG. 3 is a partially enlarged plan view showing a use state.
FIG. 4 is a partially enlarged sectional view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Cover receiving frame 11 Opening 12 Upper flange part 13 Lower flange part 14 Recessed part 20 Frame main body 21,22 Side flange 23,24 Horizontal flange 25,26 Passing part 31,32 Engagement member 35 Elastic member

Claims (4)

Suitable for relatively small openings, having a frame body with a size that can almost cover the opening of the lid receiving frame provided in the underground structure, and an engaging member provided at the end for fixing the frame body The drop prevention frame is combined so that the engagement member can move outward of the frame body and is urged outward by the elastic member, and the lid receiving frame extends almost entirely in the opening. The lower flange portion, the upper flange portion, and the recessed portion between both flange portions are provided, and the frame main body and the engaging member enter the recessed portion so as to be in an engaged state. Fall prevention frame for underground structures. The frame main body has two side rods on the left and right sides and at least two side rods connecting the both side rods, and the engaging member has a longitudinal direction of the side rod with the side rod and one side rod as a guide. The engagement member is urged as an elastic member by a compression spring which is provided so as to be movable and has one end on one side hook and another end on the inner end of the engagement member. The fall prevention frame for underground structures according to 1. The frame body crosses the opening of the lid receiving frame, and has at least two lateral flanges that join the left and right side flanges with both ends entering the recessed portion between the lower flange portion and the upper flange portion. The upper flange has a passage that allows the end of the side flange to pass through, and protrudes to the side of the passage to engage the upper flange at the side position from below. Thus, the fall prevention frame for underground structures according to claim 1 or 2, wherein the engaging member is provided at the tip portions of the left and right side fences. The engaging member has a substantially U-shaped cross-sectional shape that is bent so as to hold the left and right side flanks, and overlaps with the frame body even when it is moved outward from the frame body. The fall prevention frame for underground structures according to any one of claims 1 to 3, wherein an external force applied to the joint member is directly transmitted to the frame body.

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