JP2002061214A - Fall prevention device to underground structure or the like - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fall prevention device easily detachable to a cover holding frame and preventing it from coming off by internal pressure rise or the like. SOLUTION: A first hooking member 18 hooked from above or below to a projection 14 formed in an opening of the cover holding frame 10 is provided to a fall preventive body 11, at the same time, a lock member 19 hooked from above or below to the projection 14 is provided to the first hooking member 18 or near thereto, and a second hooking member 23 resulting in non-slipping by getting into the opening of the cover holding frame 10 is provided to a position separated from the first hooking member 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus having a mesh-like or lattice-like structure and having a fall-preventing body which can be mounted in an opening of a lid receiving frame of an underground structure or the like to prevent a person from falling down. Things.

[0002]

2. Description of the Related Art Although facilities and devices for preventing an accident in which a person falls into an opening of a manhole are known, there are still many points that need to be devised and improved. For example, Japanese Unexamined Utility Model Publication No. 6-14238 has a problem that the workability of attaching and detaching is not good because the main body is attached to the lid receiving frame by a connecting means such as a shackle. In addition, utility model registration 2
No. 549,822 uses a bolt as an engaging member that comes into contact with a part of the lid receiving frame, so that the detachability is not good either.

[0003] On the other hand, Japanese Unexamined Patent Publication No. 10-338942 has good detachability since it has a fall-preventing lid that is detachably engaged with the mounting seat of the receiving frame. However, the locking of the fall-prevention lid is only to fit the notch into the projection of the mounting seat, so it is easy to detach instead of easy to attach, especially since the heat-insulating lid is connected below, so that the internal pressure rises and There is a problem that the water comes up and comes off due to the water pressure. Small items such as shackles and bolts are often lost.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and its object is that not only is it easy to attach / detach to / from the lid receiving frame, but also there is no possibility that it will come off due to an increase in internal pressure or the like. An object of the present invention is to provide a fall prevention device for an underground structure or the like.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a first latch member which latches from above or below a projecting portion such as a step formed in an opening of a lid receiving frame. A lock member is provided on the fall-preventing body, and a lock member for locking the projection from below or above is provided on the first latch member or in the vicinity thereof so as to be movable in the latch direction and in the opposite direction, and is inserted into the opening of the lid receiving frame. A second latch member serving as a stopper is provided on the fall prevention member at a position away from the first latch member.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A fall prevention device according to the present invention is mounted in an opening of a lid receiving frame of an underground structure or the like in order to prevent a fall of a person or the like, and generally has a net-like or lattice-like structure. It has a fall prevention body. The lid receiving frame has an opening portion called a manhole when a person can enter and exit and is otherwise called an opening, and this portion is usually closed by an iron lid.

[0007] A first latching member is provided on the fall prevention member for latching from above or below the projecting portion such as a step formed in the opening of the lid receiving frame. First
Is a means for connecting the fall prevention member to the lid receiving frame, and a protrusion such as a slap is used as a mating partner. A lock member can be hooked on the protrusion from below or above. That is, in the case where the first latching member is above the projection, the lock member is placed below the projection, and when the first latching member is arranged below the projection, the locking member is placed below the projection. It is arranged above so as to sandwich the protruding portion from above so that the fall prevention member does not come off.

Accordingly, the lock member is provided at or near the first latch member so as to be movable in the latch direction and in the opposite direction. Further, the lock member may be a member to which a biasing force is constantly applied in the latching direction by a spring or the like. I will never forget the locking operation of the lock member,
This is because there is no risk of accidentally coming off.

Further, the fall prevention member is provided with a second latch member for retaining the first latch member together with the first latch member at a position away from the first latch member. The second latching member enters a concave portion provided in the opening of the lid receiving frame to prevent the lid from falling in the vertical direction.
The first and second latch members, which are arranged apart from each other, prevent inward and outward slippage.

A heat insulating plate can be easily attached to and detached from the upper surface of the fall prevention member by a weak fixing means. The heat insulating plate is used to reduce the thermal conductivity of the black iron lid to prevent partial snow melting. In addition, the weak fixing means refers to a fixing force of such a degree that it is easily detached by a weak force in a groove or a hole that can fit with the projection, for example.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to the illustrated embodiments. FIG. 1 is an exploded view of a lid receiving frame 10, a fall prevention body 11, and a heat insulating plate 12 of an underground structure. The lid receiving frame 10 has a pair of right and left protruding portions 14 called steps or handles that protrude inward of the opening 13, and has a concave portion 15 extending substantially all around the inside thereof ( (See FIG. 5).

The fall prevention body 11 has a size and a shape capable of covering substantially the entire area of the opening 13, and has a strength capable of supporting a load of a person or the like. In the illustrated example, the outer frame 16 formed of metal and having an outer shape capable of covering the opening 13 excluding the protrusion 14 and a wire net 17 stretched over the outer frame 16 are provided on the outer frame 16 facing the protrusion 14. Is attached. First latch member 18
Is an inverted L-shape so that it can be hooked on the projection 14 from above. It has the shape of a shape. The fall prevention body 11 may be formed in a lattice shape by bending a metal bar or processing a resin material instead of a frame and a net.

The lock member 19 according to the embodiment is provided at a position where the protrusion 14 is prevented from falling off from below. The exemplary locking member 19 is mounted on the first latch member base movably in the latching direction and in the opposite direction, as shown in FIG. 4, and is shown by a compression spring to project in the latching direction. A shaft member 21 receiving the urging force of the urging means 20, and a rotatable lock portion 22 attached to the tip thereof. The lock portion 22 is formed in a substantially U-shape, and the tip protrudes across the first latch member base,
When it is moved inward and rotated by 90 degrees, the leading end hits the base of the latch member, so that the first latch member 18 can be detached.

Contrary to the above embodiment, it is easy to arrange the first latching member 18 below the projection 14 and arrange the lock member 19 above the projection 14 within a range of design change. It is possible to do. In addition, since the protruding portions 14 are provided on the left and right, it is preferable in terms of stability to provide a pair of first latch members 18 so as to latch them respectively. However, for the purpose of preventing the fall prevention body 11 from coming off, it is not necessary to provide a pair of lock members 19 on the left and right, and only one of them may be sufficient.

The second latching members 23 enter the recesses 15 of the lid receiving frame 10 and serve as retaining members in the vertical direction. The second latching members 23 are separated from the first latching member 18 by about 180 degrees or adjacent to each other. It is attached at a position approximately 90 degrees apart from the one with respect to the angle. The second latching member 23 has an inverted L-shaped end 24 that can fit into the recess 15 (see FIG. 5). The illustrated end portion 24 has a substantially T-shape when viewed from the inside, thereby improving the latching stability.

On the upper surface of the above-mentioned fall prevention body 11, a heat insulating plate 12 for preventing snow melting is arranged. The heat insulating plate 12 is made of a resin foam formed using a foamable resin, and has a form covering a wider area than the fall prevention body 11. The portion 25 covering a wider area may be folded (see FIG. 1). In order to easily attach and detach the heat insulating plate 12 to the upper surface of the fall prevention body by the weak fixing means, in the embodiment, a protrusion 26 also serving as a handle, and a groove 27 formed in the heat insulating plate 12 for fitting the protrusion 26, The notch-shaped concave portion 28 formed in consideration of the collision with the latch member 18 is provided.

Since the example fall prevention body 11 has a structure in which a wire mesh 17 is stretched below the outer frame 16, a space on the wire mesh can be used for fitting the heat insulating plate 12 (FIGS. 6 and 7 (b)). ) Each reference). In this case, the fitting force between the heat insulating plate 12 and the outer frame 16 corresponds to the fixing means having a weak frictional force.

Therefore, the fall prevention device according to the present invention is in a state of being hooked on the lid receiving frame 10 by the first hooking member 18 and the second hooking member 23. Here, a lock member 19 is provided in parallel with the first latch member 18, and the first latch member 18 and the lock member 19 are
And the second latching member 23 enters the inner surface recess 15 of the opening 13 and does not move up and down, and the fall prevention frame itself can cover substantially the entire area of the opening. However, since the first latch member 18 and the second latch member 23 are erected on the outer frame 16 of the fall prevention body 11, they cannot move in the plane direction.

When a push-up force acts on the fall-preventing body 11 due to an increase in internal pressure or the like, the internal pressure or fluid causes the fall-preventing body 11 to be tied to the lid receiving frame 10 at the first latching member 18. pass. At this time, the heat insulating plate 12
Is merely attached by a weak fixing means, so that it is not separated from the fall prevention body 11 and does not block the pressure or the flow.

[0020]

Since the present invention is constructed and operates as described above, the work of attaching the fall prevention member to the lid receiving frame can be performed by one-touch operation using the lock member.
Removal work is equally easy, and despite that, even in an emergency situation where the internal pressure rises and the pushing force due to overflow, the fall prevention body does not come off and the safety is maintained It has the effect of being done.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a fall prevention device for an underground structure or the like according to the present invention.

FIG. 2 is a plan view of a fall prevention body.

FIG. 3 is a plan view of a heat insulating plate.

FIG. 4A is a partially broken plan view of a first latch member in a free state. (B) A partially cutaway plan view of the locked state of the first latch member.

FIG. 5A is a sectional view of a second latch member. (B) The inside view of a 2nd latch member.

FIG. 6 is a partially broken plan view showing a state where the camera is attached to a lid receiving frame.

FIG. 7A is a cross-sectional view in a state where a heat insulating plate is not used. (B) Sectional drawing of the state which uses a heat insulation board.

Claims (3)

[Claims] 1. An apparatus having a mesh-like or lattice-like structure and having a fall-preventing body that can be mounted in an opening of a lid receiving frame of an underground structure or the like to prevent a person from falling down. A first latching member for latching from above or below to a protruding portion such as a step formed in the opening of the fall prevention body is provided, and a locking member for latching from below or above to the protruding portion is latched in a latching direction and Moveable in the opposite direction first
The second latching member which is provided at or near the latching member of the first, and which enters into the opening of the lid receiving frame to prevent it from falling off,
A fall prevention device provided on a fall prevention body at a position distant from the latch member. 2. A fall prevention device for an underground structure or the like according to claim 1, wherein an urging means for urging the lock member in the latching direction is always in operation. 3. The fall prevention device for an underground structure or the like according to claim 1, wherein a heat insulation plate for preventing snow melting is easily attached to and detached from the upper surface of the fall prevention member by a weak fixing means.