JP3396803B2 - Fall-prevention lid and receiving frame for lid for underground structure provided with fall-prevention lid - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention prevents a worker or a passerby from falling into an opening or dropping an article when the lid main body of an underground structure lid is opened to inspect a manhole or the like. The present invention relates to a falling prevention lid and a receiving frame for an underground structure lid including the falling prevention lid. The "underground structure lid" referred to in the specification of the present application means a large iron lid, a manhole lid, a sewage lid, an electric power / An iron lid for a joint groove that can be opened and closed to protect underground facility equipment and underground cables for communication,
Iron cover for power transmission, iron cover for distribution, underground conduit in waterworks and gas pipes, and fire hydrant cover, water control valve cover, sluice valve cover, air valve that functions as an open / close door that connects the ground and its accessory equipment to the ground. The lid, gas pipe lid, water meter lid, etc. are collectively referred to.

[0002]

2. Description of the Related Art Conventionally, as a fall-prevention lid for an underground structure, for example, Japanese Utility Model Laid-Open No. 4-138441 discloses a fall-prevention lid which is attachable to and detachable from a mounting seat provided on an inner peripheral surface of an opening of a receiving frame. The structure is composed of a net-shaped lid main body and a locking tool that locks to the mounting seat of the receiving frame. By engaging the butterfly bolt provided on the locking tool with the inner peripheral surface of the receiving frame below the mounting seat. It is designed to prevent the lid body from being scratched.

[0003]

In the fall prevention lid having the above-mentioned structure, the wing bolt is engaged with the inner peripheral surface of the receiving frame below the mounting seat, so that the lid body does not grind even if an unbalanced load is applied. Even if the iron lid main body is opened by the lift generated in the underground structure (manhole), the fall prevention lid cannot be removed, so that a passerby can be prevented from falling into the underground structure. However, when the worker enters the underground structure, he loosens the butterfly bolt, removes the fall prevention lid, attaches the fall prevention lid after the work, and tightens the butterfly bolt again, which is troublesome and tightens the butterfly bolt. you forget the
It also.

The present invention has been made in view of the above points, and is a fall-preventing lid and a fall-preventing lid that can be easily attached to a receiving frame and can keep the attached state even if the lid body is opened by lift. An object of the present invention is to provide a receiving frame for a lid for an underground structure provided with.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a fall-prevention lid which is detachably attached to a receiving frame, in which an engaging member capable of engaging with a mounting seat formed on the inner peripheral surface of the receiving frame is formed on the outer periphery of the lid. the fall prevention cover is in a state that is installed on the receiving frame held by the holding member in the locked position to engage the lower surface of the mounting seat is provided with a displaceable locking member to the unlocked position when removing the holding member Is composed of elastic members
On the other hand, the locking member is attached to the shaft provided below the locking tool.
It is rotatably supported in the horizontal plane and is attached to one end of the locking member.
The lower end surface of the formed lock is slanted from the tip to the bottom.
To form an inclined surface for
In the installation, it is configured to obliquely face the edge of the mounting seat .

In the above structure, with the falling prevention lid attached to the receiving frame , the locking tool is placed on the mounting seat and the locking portion
The material is rotated in the horizontal plane by the elastic member and the lower surface of the mounting seat
It is held to engage in. As a result, the fall prevention lid cannot be detached from the receiving frame, and even if the lid body is opened due to lift pressure in the underground structure, the falling prevention lid can be kept attached to the receiving frame. . On the other hand, when removing the fall-prevention lid from the receiving frame when inspecting the inside of the underground structure, rotate the locking member against the elastic force of the elastic member.
Move it to disengage the mounting seat and remove it. Fall prevention on the receiving frame
If you place a locking tool on the mounting seat to attach the lid, the locking member
, The lower end surface of the lock part is inclined from the tip to the bottom.
None, and by diagonally facing the edge of the mounting seat,
Rotated to the disengaged position against the elastic force of the elastic member
Go over the mounting seat and return to the engaging position below the mounting seat
And is held so as to engage with the lower surface of the mounting seat.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the holding member is constituted by an elastic member, and the locking member is rotatably supported in a vertical plane with respect to a shaft provided below the locking tool. It is also possible to adopt a configuration in which the plate is held horizontally and is biased to the lock position by means of. A fall prevention cover from the receiving frame
When removing the lock member, lift the locking member against the elastic force of the elastic member.
Pivot to disengage the mounting seat and remove it. With such a configuration, the locking member is automatically locked when the fall prevention lid is attached to the receiving frame, and it is possible to prevent forgetting to hang the locking member.

Further, the holding member is composed of an elastic member, and the locking member is slidable back and forth with respect to the lid body in the mounted state, and is biased to the lock position by the elastic member. You can also Fall prevention cover from the receiving frame
When removing the lock member, resist the elastic force of the elastic member.
Slide backward to release the engagement with the mounting seat and remove it. In the receiving frame
If you place a locking tool on the mounting seat to attach the fall prevention lid,
As for the locking member, the lower end surface of the lock part goes from the tip to the bottom.
By forming an inclined surface, it resists the elastic force of the elastic member.
Sliding to the disengagement position, overcoming the mounting seat,
It is pulled back to the engaging position below the seat and engages with the bottom surface of the mounting seat.
To meet. With such a configuration, the locking member is automatically locked when the fall prevention lid is attached to the receiving frame, and it is possible to prevent forgetting to hang the locking member.

The holding member may be constituted by a fastening member, and the locking member may be held in a locked position by the fastening member while being supported horizontally . When removing the fall prevention cover from the receiving frame, attach the locking member.
Rotate vertically downward to release the engagement with the mounting seat and remove it.
With such a configuration, the fall prevention lid can be reliably held in the mounted state, and it is possible to reliably prevent a person other than the operator from opening the fall prevention lid.

Further , the receiving frame of the lid for the underground structure is configured such that the fall prevention lid according to any one of claims 1 to 4 is attached to a mounting seat formed on the inner peripheral surface of the receiving frame. With such a structure, even if a lifting pressure is generated inside the underground structure and the lid body is opened, the fall prevention lid is held by the receiving frame and cannot be removed. It is possible to reliably prevent falling into the structure.

(Embodiment 1) FIG. 1 is a plan view showing a falling prevention lid according to the present invention and a receiving frame of a lid for an underground structure including the same, and FIG. 2 is fixed to the falling prevention lid of FIG. FIG. 3 is a plan view of the engaging member and FIG. 3 is an exploded perspective view showing the engaging member and the locking mechanism of FIG. 2. Underground construction for the lid 1 in Figure 1, a receiving frame 2, the open port of the receiving frame 2
Has a circular shape in plan view, which includes a lid body (iron lid) (not shown) that closes open and closed, and a fall prevention lid 4 that is mounted inside the receiving frame 2, and the lid body is flush with the ground surface. Is installed.

In the receiving frame 2, a plurality of mounting seats 3 are formed on the inner peripheral surface 2a along the circumferential direction, for example, protruding in a bow shape at six positions at equal intervals, and projecting portions 3a are formed on the upper surface edge.
Fall prevention cover 4 is provided with a lid 5, and a fastener 6 for locking the lid member 5 to the mounting seat 3 of receiving frame 2. The lid 5 has a circular main frame member 7 having a smaller diameter than the opening of the receiving frame 2, and reinforcing members 8 and 8 for reinforcing the main frame member 7.
And a net body provided on the upper surface of the main frame member 7, for example, expanded metal 9. The main frame member 7 is composed of arc-shaped frame members 7a to 7c that are divided into three equal parts in the circumferential direction, and the locking tools 6 are respectively interposed between these frame members 7a, 7b, and 7c. The main frame member 7 which is circular and is fixed by welding.
Are formed.

A locking mechanism 15 is provided below each locking tool 6 as shown in FIGS. 2 and 3. The lock 6 is
None the end view substantially U-shaped opening downward, both the leading end portion 6b of the upper plate 6a is capable mounted is bent into a substantially crank shape upward the mounting seat 3 of receiving frame 2, the protrusion 3a A hole 6c for fitting with is provided. Tip from the upper plate 6a
The height of 6b is set to be slightly larger than the thickness of the mounting seat 3 of the receiving frame 2.

The side plate 6d on one side of the locking tool 6 is notched and opened from the tip to substantially the center, and the side plate 6e on the other side is opened.
Has a U-shaped bottom plate 6f with its tip bent inward at a right angle. Then, both sides plate 6d, 6e, but it
Each of them is welded and fixed to the end faces of the arc-shaped frame members 7a, 7b, 7c. A hole 6g is formed at the tip of the bottom plate 6f, and a screw hole 6h is provided at a position of the upper plate 6a facing the hole 6g.

As shown in FIG. 3, the locking mechanism 15 is composed of a lock plate 16 as a locking member, a torsion coil spring 17 as an elastic member as a holding member, and a bolt 18 as a shaft. Lock plate 16
Has a substantially U shape in a plan view, one side is a lock portion 16a, and the other side is an operation portion 16b. The upper and lower ends at a substantially central position are bent inward at a substantially right angle to the lock portion 16a and are substantially U-shaped. Supporting pieces 16c and 16d having a shape are formed. The upper end surface 16e of the lock portion 16a is a horizontal surface, and the lower end surface thereof is an inclined surface 16f that inclines obliquely downward from the tip toward the lower support piece 16d. Further, a small hole 16g is provided substantially in the center of the lock portion 16a.

The tip 16h of the operating portion 16b is the support piece 1
It is bent at a substantially right angle on the same side as 6c and 16d, and a notch 16i is provided at the upper end corner. This notch 16
i is for an operator to hang his / her finger when rotating the lock plate 16. Upper and lower support pieces 16c, 16
The hole 16j, 16d which can be fitted between the upper plate 6a and the bottom plate 6f of the locking tool 6 and communicates with the screw hole 6h and the hole 6g.
k is drilled. In the torsion coil spring 17, a bolt 18 can be loosely fitted, one end 17a is bent outward in the axial direction, and the other end 17b is bent laterally at a substantially right angle.

The lock plate 16 is the upper plate 6 of the locking tool 6.
It is fitted between a and the bottom plate 6f, and the torsion coil spring 17
Is housed between the support pieces 16c and 16d and
a is locked by a locking portion 6i formed on the bottom plate 6f of the locking tool 6, and the other end 17b is locked by the locking portion 16 of the lock plate 16.
It is inserted and locked in the small hole 16g of a. The bolt 18 includes a hole 6g, a lock plate 16 and a bottom plate 6f of the locking tool 6 from below.
16k of the support piece 16d, the torsion coil spring 17, and the hole 16j of the support piece 16c of the lock plate 16 so that the threaded portion 18a at the tip is the screw hole 6 of the upper plate 6a of the locking tool 6.
It is screwed to h. In this way, the lock plate 16 and the torsion coil spring 17 are assembled to the locking tool 6.

The lock plate 16 is rotatable in a horizontal plane with the bolt 18 as an axis in a state where the lock plate 16 is assembled to the locking tool 6, and is attached counterclockwise by the spring force of the torsion coil spring 17 as shown in FIG. Powered by the operating unit 16
The end surface 16h ′ of the tip portion 16h of b is the side plate 6e of the locking tool 6.
The inner surface is abutted and locked. In this state, the lock portion 16a of the lock plate 16 has the tip portion 6b of the locking tool 6.
, And the upper end surface 16e thereof faces the lower surface of the tip end portion 6b with a space therebetween as shown in FIG. Then, the lock plate 16 is set to a lock position where it engages with the lower surface of the mounting seat 3, and a finger is put on the cutout portion 16i of the operation portion 16b to resist the spring force of the torsion coil spring 17 and the arrow in FIG. It is operated from the locked position to the unlocked position by rotating in the clockwise direction A shown by.

Next, a mounting state of the fall prevention lid 4 to the receiving frame 2 and a method of attaching and detaching the fall prevention lid 4 will be described. As shown in FIG. 1, when the fall prevention lid 4 is attached to the receiving frame 2, each locking tool 6
The tip portion 6b is placed on the mounting seat 3 of receiving frame 2, the hole 6c is engaged with the projection portion 3a, and to cover substantially the whole surface of the open mouth of the receiving frame 2 with the lid member 5. Locking mechanism is provided on the locking member 6 as shown in FIGS. 2 and 4 15 is biased into the locking position by a spring force of the lock plate 16 is a torsion coil spring 17, shown in FIGS. 2 and 6 As described above, the tip of the lock portion 16 a is inserted under the mounting seat 3 of the receiving frame 2. At this time, the lock portion 16 of the lock plate 16
The upper end surface 16e of a faces the lower surface of the mounting seat 3 with a slight gap. In this state, when the fall prevention lid 4 is pushed up by the lifting pressure in the manhole, for example, the lock portion 16a of the lock plate 16 is locked to the lower surface of the mounting seat 3 of the receiving frame 2, and the fall prevention lid 4 is lifted. To be prevented.

Therefore , due to the temporary increase in the amount of rainfall, a lift is generated in the underground structure, and by any chance, the lock (not shown) of the lid body fitted and supported by the receiving frame 2 comes off from the receiving frame 2. Even when the lid is opened, the fall prevention lid 4 can be maintained in the attached state, and a passerby or the like can be prevented from falling into the underground structure. Next, a case where the fall prevention lid 4 is removed will be described.

When there are a plurality of workers, for example, three workers, each worker unlocks the locking mechanism 15 of the lock 6 at each of the three positions. That is, each worker, respectively insert the fingers below the tip 6b of Kakukakaritomegu 6, the lock plate 16
2 is resisted against the spring force of the torsion coil spring 17 by hooking a fingertip on the cutout portion 16i (FIGS. 3 and 4) of the operation portion 16b of FIG.
Then, as shown by the two-dot chain line 16 ', it is rotated clockwise to the unlocked position, and the lock portion 16a is removed from below the mounting seat 3. As a result, the lock of the lock plate 16 is released. Then, each worker lifts the locking tool 6 while holding the lock plate 16 in the unlocked state, and removes the fall prevention lid 4 from the receiving frame 2. Lock plate 16
When the operator releases the fingertip from the cutout portion 16i, the spring force of the torsion coil spring 17 returns to the locked position.

When only one worker opens the fall prevention cover 4, the worker must first lock one of the three places.
And unlock the plate 16 with one hand
Hold the other lock plate 16 on the other
While releasing the lock with one hand, the two locking tools 6 are lifted, and when the lock plate 16 is located above the mounting seat 3, the fall prevention lid 4 is held in an inclined state with one hand. Next, the operator unlocks the remaining one lock plate 16 with the other hand, lifts the fall prevention lid 4, removes it from the receiving frame 2, and opens the lid.

When the fall prevention lid 4 is attached, the tip end 6b of each locking tool 6 is placed on the mounting seat 3 of the receiving frame 2, and the hole 6c is aligned with the protrusion 3a. As shown in FIG. 5, the lock plate 16 has an inclined surface 16 in which the lower end surface of the lock portion 16a is obliquely inclined from the tip toward the lower support piece 16d.
2 and the lock portion 16a diagonally faces the edge of the mounting seat 3 of the receiving frame 2 in the locked position as shown in FIGS.
When the inclined surface 16f of the lock portion 16a hits the upper edge of the mounting seat 3 of the receiving frame 2 as it is mounted on the
2 is gradually rotated clockwise to the unlocked position shown by the chain double-dashed line 16 ′ in FIG. 2, and the tip 6b of the locking tool 6 is locked just before it comes into contact with the upper surface of the mounting seat 3. Part 16
a passes over the mounting seat 3 and returns to the locked position shown by the dotted line in FIG. 2 by the spring force of the torsion coil spring 17. As a result, the lock plate 16 is located below the mounting seat 3 of the receiving frame 2 and prevents the fall prevention lid 4 from rising.

(Embodiment 2) FIGS. 7 to 9 show a second embodiment of the locking mechanism provided below the locking tool 6. Note that the member and the same or <br/> corresponding member of Example 1, its description is omitted the Nos. Ichifu.
As shown in FIGS. 7 and 8, the locking mechanism 20 is composed of a lock plate 21 as a locking member and a spring 22 as an elastic member as a holding member. The lock plate 21 has a substantially central portion pivotally supported on the side plate 6e of the locking tool 6 by a bolt 23 so as to be rotatable in a vertical plane.
The tip is a lock portion 21a. An operation portion 21b for hanging a finger is formed on the upper surface of the lock portion 21a so as to horizontally project outward. Also, the lock part 2
The lower surface of 1a is an inclined surface 21c that inclines obliquely from the tip side toward the lower surface of the central portion.

The spring 22 has one end locked to a pin 24 fixed to the base end side of the lock plate 21, and the other end locked to a pin 25 fixed to the side plate 6e of the locking tool 6, The lock plate 21 is pulled and held so as to be parallel to the upper plate 6a of the locking tool 6. Upper plate 6a of the locking tool 6
A stopper bolt 26 is screwed into the lock plate 21 so as to face the base end side of the upper surface of the lock plate 21.
Of the lock plate 21 by abutting the base end side of
To prevent it from rotating counterclockwise from the locked position. The lock plate 21 is in a locked state in which the lock portion 21a engages with the lower surface of the mounting seat 3 in the state shown in FIG. 8 in which the fall prevention lid 4 is placed and locked on the mounting seat 3 of the receiving frame 2, and the fall prevention is performed. When the lid 4 is pushed up by the lifting pressure in the manhole, the lock portion 21a of the lock plate 21 is locked to the lower surface of the mounting seat 3 of the receiving frame 2 to prevent the fall prevention lid 4 from floating.

When removing the fall prevention cover 4, the operator inserts his / her finger below the operating portion 21b of the lock plate 21 and locks the lock plate 21 against the spring force of the spring 22 as shown by the arrow in FIG. The lock portion 21a is unlocked by removing the lock portion 21a from below the mounting seat 3 by rotating the portion 21a side upward. Incidentally, the lock portion 21a of the lock plate 21 is in the lower surface facing the mounting seat 3 at intervals which may be rotated from the locked position to the unlocked position. The operator lifts the locking tool 6 and removes the fall prevention lid 4 from the receiving frame 2 while holding the lock plate 16 in the unlocked state. The operator operates the lock plate 21 by operating the operation unit 21.
When the fingertip is released from b, the spring force of the spring 22 returns the lock position.

When the fall prevention lid 4 is mounted on the receiving frame 2, the tip 6b of the locking tool 6 is placed on the mounting seat 3 as in the first embodiment. As shown in FIG. 8, the lock plate 2
1, the lower end surface of the lock portion 21a is an inclined surface 21c that inclines obliquely from the tip toward the lower surface of the central portion, so that the lock portion 21a is mounted as the locking tool 6 is mounted on the mounting seat 3. When the sloping surface 21c hits the upper edge of the mounting seat 3 of the receiving frame 2, it rotates clockwise against the spring force of the spring 22 as shown by the arrow in FIG. The lock portion 21a rides over the mounting seat 3 just before contacting the upper surface of 3, and is returned to the lock position shown in FIG. 8 by the spring force of the spring 22. As a result, the lock plate 21 is located below the mounting seat 3 to prevent the fall prevention lid 4 from rising.

(Embodiment 3) FIGS. 10 and 11 show a third embodiment of the locking mechanism. Note that the member and the same or corresponding members of the first embodiment, its description is omitted the Nos. Ichifu. As shown in FIG. 10, a locking mechanism 30 slidable along the locking tool 6 is provided inside the locking tool 6.

The locking mechanism 30 is composed of a lock plate 31 as a locking member, bolts 32 and 33 for supporting the lock plate 31 on the locking tool 6, and a spring 35 as an elastic member as a holding member. ing.
The lock plate 31 is a rod-shaped body that is open downward and has a substantially U-shape when viewed from the end, and the tip ends of both side surfaces 31b and 31b are inclined surfaces 31c and 31c that are inclined obliquely downward. Long holes 31d, 31d along the longitudinal direction are provided on both side faces 31b, 31b along the longitudinal direction, and holes 31e, 31e are formed on the base ends.
Has been drilled. In addition, the pin 3 is provided approximately at the center of the upper surface 31a.
6 is fixed. On the other hand, the side plates 6d and 6e of the locking tool 6
The holes 6j and 6j are formed at positions corresponding to the long holes 31d of the lock plate 31, and the long holes 6k and 6k are formed at positions corresponding to the holes 31e along the longitudinal direction. This long hole 6k
Has the same length as the long hole 31d of the lock plate 31. Further, the upper plate 6a is provided with pins 36 along the longitudinal direction.
A long hole 6m for inserting the through hole is provided. This long hole 6m
Has the same length as or slightly longer than the long hole 6k.

The bolt 32 is provided on both side plates 6d, 6 of the locking tool 6.
e through the holes 6j, 6j, and the long holes 31d on both side surfaces 31b, 31b of the lock plate 31, and the nut 34 is inserted.
Are screwed together. The bolts 33 are both side plates 6 of the locking tool 6.
The nuts 34 are inserted through the respective long holes 6k of d and 6e and the respective holes 31e of both side faces 31b and 31b of the lock plate 31.
Are screwed together. Further, the pin 36 of the upper surface 31a is inserted into the elongated hole 6m of the upper plate 6a of the locking tool 6 so that the tip portion thereof projects upward. As a result, the lock plate 31 can be slid horizontally along the locking member 6 in the front-rear direction by the length of the long hole 31d. The spring 35 is the lock plate 3
1, and one end 35a is locked to the bolt 32,
The other end 35b is locked to the bolt 33 so that the lock plate 3
1 is pulled toward the tip portion 6b of the locking tool 6 to urge it.

As shown in FIG. 11, the falling prevention lid 4 is provided with the receiving frame 2.
The lock plate 31 is pulled by the spring force of the spring 35 and is attached to the mounting seat 3 of the receiving frame 2 when the locking member 6 is mounted on the mounting seat 3 of the receiving frame 2.
It is moved to the side, and the lock portion 31f enters below the mounting seat 3 and is in a locked state. When the fall prevention lid 4 is pushed up by the lifting pressure in the manhole, the lock portion 31 f of the lock plate 31 causes the mounting seat 3 of the receiving frame 2 to move.
The fall prevention lid 4 is prevented from floating by being locked to the lower surface of the.

When the fall prevention cover 4 is removed from the receiving frame 2, the operator pushes the lock plate 31 against the spring force of the spring 35 to move the lock plate 31 to the base end side of the locking tool 6 as shown by the arrow in FIG. The lock portion 31f is moved to remove the lock portion 31f from below the mounting seat 3 of the receiving frame 2 to release the lock, and in this state, the fall prevention lid 4 is lifted. Lock plate 31
When the operator releases his hand from the pin 36, the spring force of the spring 35 returns the lock to the locked position.

When the fall prevention lid 4 is mounted on the receiving frame 2, the tip 6b of the locking tool 6 is placed on the mounting seat 3 of the receiving frame 2. As shown in FIG. 11, in the lock plate 31, the lower end surface of the lock portion 31f is an inclined surface 31c that is inclined obliquely downward from the tip, so that when the inclined surface 31c hits the upper edge of the mounting seat 3. The spring portion 35 is pushed against the spring force of the spring 35 in the direction shown by the arrow in FIG. 11, and the lock portion 31f passes over the mounting seat 3 just before the tip portion 6b comes into contact with the upper surface of the mounting seat 3. By Figure 11
Is pulled back to the locked position indicated by. As a result, the lock plate 31 is positioned below the mounting seat 3 to prevent the fall prevention lid 4 from rising.

(Embodiment 4) FIGS. 12 to 14 show a fourth embodiment of the locking mechanism provided below the locking tool. Incidentally, identical to the parts of the first embodiment also
The The corresponding members, its description is omitted the Nos. Ichifu. As shown in FIG. 12, a locking mechanism 40 is provided below the locking tool 6. The locking mechanism 40 includes a lock plate 41 serving as a locking member, and a lock, which is a fastening member serving as a holding member that fastens the locking tool 6 and the lock plate 41, such as a padlock 42.

The lock plate 41 has a lock portion 41a at the front end thereof, and a hole 41b at the base end portion of the lock plate 41 serving as a spindle.
3 and the nut 44 rotatably pivotally support the side plate 6e of the locking tool 6, and the lock portion 41a is vertically rotatable. When the fall prevention lid 4 is mounted on the receiving frame 2, the lock plate 41 has the lock portion 41a positioned below the mounting seat 3 of the receiving frame 2 in a horizontally supported state. An operation portion 41c for hooking a finger is provided on the upper edge of the lock portion 41a of the lock plate 41 so as to project laterally substantially horizontally, and a hole 41d is formed in the lower portion of the lock portion 41a. On the other hand, the side plate 6e of the locking tool 6 is provided with a hole 6d at a position corresponding to the hole 41d with the upper surface of the lock plate 41 held substantially parallel to the upper plate 6a of the locking tool 6.
n are drilled. And these holes 41d and 6n
The hook 42a of the padlock 42 can be inserted therethrough.

As shown in FIG. 13, the fall prevention lid 4 is provided with the receiving frame 2
The lock plate 41 is rotated to a horizontal position in a state in which the lock 6 is mounted on the mounting seat 3 of the receiving frame 2 and is locked on the mounting seat 3 of the receiving frame 2, and the padlock 4 is inserted into the hole 41d and the hole 6n of the lock 6.
The second hook 42a is inserted and locked. The lock plate 41 has a lock portion 41 a that can be engaged with the mounting seat 3 by being inserted below the mounting seat 3 while being held horizontally. When the fall prevention lid 4 is pushed up by the lifting pressure in the manhole, the lock portion 41a of the lock plate 41 is locked to the lower surface of the mounting seat 3 of the receiving frame 2 to prevent the fall prevention lid 4 from rising. Further, it is possible to reliably prevent a person other than the worker from removing the fall prevention cover 4.

When the fall prevention lid 4 is removed from the receiving frame 2, an operator unlocks the padlock 42 with a key to lock the hook 42a with the hook 6a and the holes 6n and 41d of the lock plate 41.
When it is pulled out from the lock plate 4 as shown in FIG.
1, the lock portion 41a rotates downward due to its own weight and is disengaged from below the mounting seat 3. As a result, the fall prevention lid 4 can be removed.

When the fall prevention lid 4 is mounted on the receiving frame 2, the operator places the tip 6b of the locking tool 6 on the mounting seat 3 of the receiving frame 2 and then operates the operating portion 41c of the lock plate 41 with his fingertip. It is lifted and rotated clockwise as shown by the arrow in FIG. 14 to a substantially horizontal position. Then, the hook 42a of the padlock 42 is inserted into the hole 41d of the lock plate 41 and the hole 6n of the locking tool 6 to be locked. As a result, the lock plate 41 is located below the mounting seat 3 of the receiving frame 2 and the fall prevention lid 4
To prevent the rise of.

Although the present invention has been described based on the four embodiments, the present invention is not limited to the embodiments.
For example, a fastening member such as a padlock may be added to the first to third embodiments in order to prevent a person other than the worker from entering the inside of the underground structure. Specifically, in the first embodiment, holes are formed in the tip portion 16h of the lock plate 16 and the side plate 6e of the locking tool 6, and in the second embodiment, the lock plate 21 and the side plate 6e of the locking tool 6 are formed. Holes are formed in the and, and the padlock hooks are inserted through these holes to lock plate 16,
Disable 21. In the third embodiment, the lock plate 3 is inserted by inserting the padlock hook into the long hole 31d of the lock plate 31 held at the lock position.
Disable the operation of 1.

[0040]

According to fall prevention cover of the present invention, the fall prevention cover to position the locking member and the locking member for engaging the lower surface of the mounting seat formed on the inner peripheral surface receiving frame in the locked position holding By providing the member, it is possible to securely hold the fall prevention lid in the mounted state, and in the case where the lid body is opened due to a lift pressure generated inside the manhole due to a temporary increase in rainfall etc. However, the fall prevention lid can be kept attached.

Further, by forming the holding member by an elastic member and urging the locking member to the lock position by the elastic member, it is possible to prevent forgetting to lock the lock when the fall prevention lid is attached to the receiving frame. it can. Further, the holding member is constituted by a fastening member, both when the locking member can be reliably held in a state of mounting the fall prevention cover on the receiving frame by holding in the locked position by the fastening member, other than the operator It is possible to reliably prevent a person from opening the lid.

A locking member that engages with the lower surface of the mounting seat
By attaching the fall prevention lid formed with the holding member for positioning the locking member to the lock position to the receiving frame, a lift is generated inside the underground structure due to a temporary increase in rainfall or the like, and by any chance, Even when the lid main body is opened, the fall prevention lid does not come off, so that a passerby or the like can be reliably prevented from falling into the underground structure.

[Brief description of drawings]

FIG. 1 is a plan view of a receiving frame of a lid for an underground structure equipped with a fall prevention lid according to the present invention.

2 is an enlarged view of the locking device of FIG. 1. FIG.

FIG. 3 is an exploded perspective view showing a locking tool and a locking mechanism of FIG.

FIG. 4 is a plan view of the locking mechanism in a state where the upper plate of the locking tool of FIG. 2 is removed.

FIG. 5 is a side view of the locking mechanism of FIG. 3 in an assembled state.

6 is a cross-sectional view taken along the line VI-VI in FIG.

FIG. 7 is a partially cutaway plan view of a second embodiment of a locking mechanism provided on a fall prevention lid.

8 is a side view of the locking mechanism in FIG. 7. FIG.

9 is an explanatory view showing an unlocking operation of the locking mechanism of FIG.

FIG. 10 is an exploded perspective view showing a third embodiment of a locking mechanism provided on a locking tool.

11 is a cross-sectional view of the assembled locking mechanism of FIG.

FIG. 12 is an exploded perspective view showing a fourth embodiment of a locking mechanism provided on a locking tool.

13 is a diagram showing a locked state of the locking mechanism of FIG.

14 is a diagram showing an unlocked state of the locking mechanism in FIG.

[Explanation of symbols]

1 Underground structure lid 2 receiving frame 3 mounting seat 4 Fall prevention lid 5 Lid 6 locking tool 7 Main frame member 8 Reinforcement member 9 Expander metal (net) 15, 20, 30, 40 Locking mechanism 16, 21, 31, 41 Lock plate (locking member) 17 Torsion coil spring (elastic member as holding member) 18, 23, 32, 33, 43 bolt (shaft) 22, 35 Spring (elastic member as holding member) 42 Padlock (fastening member as holding member)

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E02D 29/12 E04G 21/32

Claims (5)

(57) [Claims] 1. A fall-prevention lid which is formed on the outer periphery of a lid body and which can be attached to a mounting seat formed on the inner peripheral surface of the receiving frame, and is attachable to and detachable from the receiving frame. In a mounted state, a holding member is held at a lock position that engages with the lower surface of the mounting seat by a holding member, and when detached, a locking member that is displaceable to a lock release position is provided , and the holding member is configured by an elastic member, The locking member has a horizontal surface with respect to an axis provided below the locking tool.
The lock part is rotatably supported inside and the lower end surface of the lock part is formed at one end of the locking member.
A slanting surface that is slanted from the bottom to the bottom, and the locking portion faces the edge of the mounting seat at the locking position.
A fall prevention lid characterized by diagonally facing each other . 2. It can be locked to a mounting seat formed on the inner peripheral surface of the receiving frame.
Various locking tools are formed on the outer circumference of the lid so that it can be attached to and removed from the receiving frame.
In the fall prevention lid, attach this fall prevention lid to the receiving frame.
Locked position that engages the lower surface of the mounting seat when
Is held by a holding member and unlocked when removed
A locking member that is displaceable at a position is provided, the holding member is made of an elastic member, and the locking member is a vertical surface with respect to an axis provided below the locking tool.
Is rotatably supported inside, and the tip of the locking member is a lock portion,
The base ends facing each other with the shaft as a fulcrum are pulled by the elastic member.
It is stretched and held horizontally, and the lock part is raised from the lock position to the mounting seat.
There is an interval that allows rotation from the bottom of the
A fall prevention lid that faces the lower surface of the mounting seat . 3. It can be locked to a mounting seat formed on the inner peripheral surface of the receiving frame.
Various locking tools are formed on the outer circumference of the lid so that it can be attached to and removed from the receiving frame.
In the fall prevention lid, attach this fall prevention lid to the receiving frame.
Locked position that engages the lower surface of the mounting seat when
Is held by a holding member and unlocked when removed
A locking member that is displaceable at a position is provided, and the locking member is provided below the locking tool and is opened downward.
The holding member is formed into a rod-shaped body having a substantially U-shape when viewed from the end.
Housed, together with the retaining member is constituted by an elastic member, the locking member is slidable in the longitudinal direction, the pin is fixed to the substantially center of the upper surface of the locking member, the longitudinal to the locking device The length that the pin is inserted along the direction
A hole is provided, and the lower end surface of the locking part of the locking member is from the tip to the bottom.
It is characterized by forming an inclined surface that inclines obliquely toward
A fall prevention lid. 4. A mounting seat formed on the inner peripheral surface of the receiving frame can be locked.
Various locking tools are formed on the outer circumference of the lid so that it can be attached to and removed from the receiving frame.
In the fall prevention lid, attach this fall prevention lid to the receiving frame.
Locked position that engages the lower surface of the mounting seat when
Is held by a holding member and unlocked when removed
A locking member that is displaceable at a position is provided, the locking member is constituted by a fastening member, and the locking member is a vertical surface with respect to an axis provided below the locking tool.
Is rotatably supported inside, and the locking member is in a locked position when horizontally supported.
A fall prevention lid that can be placed . 5. An underground structure having a fall prevention lid, characterized in that the fall prevention lid according to any one of claims 1 to 4 is attached to a mounting seat formed on an inner peripheral surface of a receiving frame. The receiving frame for the lid.