JP2002275924A - Locking structure of underground structure cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a locking structure of an underground structure cover capable of simplifying the structure to easily handle a cover body and surely executing the improvement in terms of strength and the locking. SOLUTION: A fixed engaging section 23 consisting of a hanging section 21 for hanging downward and a hook 22 rising outward from the lower end of the hanging section 21 is projected to the edge on the back side of the cover body 20 for opening and shutting an opening 11 of a holding frame 10 having the approximately oval opening 11, a recess section 12 opened in the inside circumference of the holding frame 10 and an locking member 15 pivoted on a shaft 14 erected to both side walls 13 of the recess section 12 in a rotatable manner are provided to the holding frame 10, a locking member 17 capable of engaging with the hook 22 of the fixed engaging section 23 and a weight 18 located on a locking position capable of always engaging the locking member 17 with the hook 22 by its self-weight are provided to the locking member 15, and a stopper 50 for maintaining a locking posture of the locking member 15 by engaging with the weight 18 of the locking member 15 is provided to the holding frame 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking structure for a lid for an underground structure, and more particularly, to an opening for communicating an underground structure or an underground structure facility in a sewer with the ground. The present invention relates to a locking structure for a cover for an underground structure such as a manhole cover.

[0002]

2. Description of the Related Art A lid for a conventional underground structure includes a receiving frame having a substantially circular opening communicating with an underground structure such as a sewer, an opening and closing of the opening of the receiving frame, and a locking position of the receiving frame. A lid body pivotally fitted to the lock position, and a hinge for connecting the lid body to the receiving frame so as to be openable and closable,
It has a structure in which a locking portion is provided on a portion opposite to the hinge.

[0003] Further, as a conventional locking structure for a lid for an underground structure of this type, an engaging member having a hook and a weight portion which are swingably hung on a rear surface edge of the lid, and a receiving frame are provided. A structure having a locking portion provided on the inner peripheral surface is known (Japanese Utility Model Publication No. 7-15880, Japanese Patent Application Laid-Open No. 10-26).
No. 6243).

[0004] The underground structure lid having the above structure is provided on a side opposite to the hinge side after a hinge is inserted into a hinge mounting portion provided on a receiving frame with the hinge side of the lid body inclined downward. The engaging member is dropped into an unlocking portion adjacent to the locking portion provided on the receiving frame, and the lid can be turned in this state to close the lid in a locked state. In this locked state,
The hook is rotated in the locking position direction by the weight of the weight,
It can engage with the locking portion. That is, for example, when an air hammer or a water hammer phenomenon occurs in an underground structure due to rainwater flowing into a sewer due to rainfall, the hook engages with the locking portion, and the lid rises. And scattering are prevented.

Further, as another locking structure, a box-shaped engaging member having an open surface is provided on the back edge of the lid, a recess is provided on the inner peripheral surface of the receiving frame, and the receiving frame is bridged in the recess. An elastic member that supports the lock body that is movable to a locking position and an unlocking position in the axial direction on the shaft and that can rotate around the axis, and that presses the lock body toward the locking position and maintains the locked state. There is also known one having a structure provided (JP-A-10-266).
246).

According to this locking structure, in the locked state, even if the lock body swings due to the lifting pressure generated inside the underground structure and tries to retreat into the recess, the lock body swings due to the urging force of the elastic member. Can be locked. Further, by providing the engaging member with a side wall which can be brought into contact with the locking portion of the lock main body from the side, the lock main body provided on the receiving frame is moved from the locked position to the unlocked position when the lid is opened. Thereafter, the lid main body can be swung to enable the lock main body to move to the unlocking position on the side wall of the engagement member.

[0007]

However, the former, ie, Japanese Utility Model Publication No. Hei 7-15880, and Japanese Patent Application Laid-Open No. H10-26
The locking structure described in Japanese Patent No. 6243 or the like is a structure in which an engaging member is pivotally pivotally attached to a lid that is opened and closed. It is necessary to handle the lid carefully so as not to give it. In addition, since the structure is such that the locked state is maintained mainly by the weight of the weight part, for example, when the lid for the underground structure is installed on an inclined road surface, the hook is maintained in the unlocked state depending on the inclination angle of the inclination. In this state, an air hammer or a water hammer phenomenon occurs in the underground structure, and if a sudden turbulent lifting pressure is applied, the lid may float and scatter.

As a method of solving this problem, it is conceivable to maintain the hook in a locked state by urging the hook with the elastic force of the elastic member.
It is necessary to handle the lid carefully so as not to give an impact to the engaging member when the lid is opened / closed or transported. Also,
With this structure, the structure has many constituent members,
There is a problem that the structure becomes complicated. Further, since there is a limit to receiving the lifting pressure of the lid only by the elastic force of the elastic member, the lid may move to the unlocking position side even when the hook and the locking portion are engaged. There is also a problem that the floating and scattering of the lid cannot be reliably prevented.

Further, the latter, that is, Japanese Patent Application Laid-Open No. 10-2662.
According to the locking structure disclosed in Japanese Patent Publication No. 46-46, the engaging member is fixed to the lid, so that the lid can be opened and closed, transported, and the like as compared with the case where the engaging member is swingably mounted. Easy handling of body. However, in this locking structure, the engaging member is formed in a box shape with one surface opened, and the lock body can be moved to a locking position and an unlocking position in the axial direction on a shaft installed in the recess. In addition, since the elastic member is formed so as to be rotatable about an axis and presses the lock body toward the locking position and maintains the locked state, the number of constituent members increases and the structure becomes complicated. There is.
Further, since the lock body is configured to move to the locking position and the unlocking position, even when the lock body and the engaging member are engaged, the lid may move to the unlocking position, There is also a possibility that floating and scattering of the lid cannot be reliably prevented.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a lid for an underground structure lid which has a simplified structure, facilitates handling of the lid, improves strength, and can be securely locked. It is an object to provide a locking structure.

[0011]

In order to achieve the above object, the invention according to claim 1 has a receiving frame having a substantially circular opening, an opening and closing position of the opening of the receiving frame, and a locking position between the receiving frame and the receiving frame. In a lid for an underground structure including a lid pivotally fitted to the unlocking position and a hinge connecting the lid to the receiving frame so as to be openable and closable, A fixed engaging portion consisting of a hanging portion hanging downward and a hook projecting outward from the lower end of the hanging portion protrudes, and the receiving frame is provided with a concave portion opened on the inner peripheral surface of the receiving frame. A locking member rotatably pivotally mounted on a shaft provided on both side walls of the concave portion; a locking portion capable of engaging with a hook of the fixed engaging portion; A weight portion which is located at a locking position where the locking portion can always be engaged with the hook by its own weight; and The receiving frame is provided with a stopper that engages with the weight of the locking member to maintain the locking posture of the locking member.

With this configuration, since the fixed engaging portion having the hook is protruded from the lid, even when the lid for the underground structure is installed on an inclined road surface, the hook is formed by the inclination angle of the inclination. Does not enter the unlocked state, and the locked state can be reliably maintained. Moreover,
In comparison with a structure in which an engaging member having a hook is swingably connected to the lid, handling such as opening and closing of the lid and transportation can be facilitated. The locking member pivotally mounted in the recess provided in the receiving frame has a locking portion capable of engaging with the hook of the fixed engaging portion, and a locking position in which the locking portion can always engage with the hook by its own weight. By providing the weight portion located, the number of constituent members can be reduced. Further, by providing a stopper on the receiving frame for engaging with the weight of the locking member to maintain the locking position of the locking member, the weight of the locking member is engaged with the stopper during locking. The lifting pressure received by the body can be distributed to the receiving frame, and the locked state can be reliably maintained. Therefore, the strength can be improved, and the floating and scattering of the lid can be reliably prevented.

According to a second aspect of the present invention, there is provided a receiving frame having a substantially circular opening, a lid which opens and closes the opening of the receiving frame, and which is rotatably fitted to a locking position and an unlocking position of the receiving frame. A hinge for connecting the lid body to the receiving frame so as to be openable and closable, a hanging part hanging down on a rear edge of the lid body, and a lower end part of the hanging part. A fixed engaging portion consisting of a hook that protrudes outward from the projection is provided. The receiving frame has a concave portion that opens on the inner peripheral surface of the receiving frame and a shaft that is provided on both side walls of the concave portion. A locking member pivotally attached to the locking member, the locking member having a locking portion engageable with a hook of the fixed engaging portion, and a locking portion interposed between the receiving frame and the locking portion. Provide an elastic member located in a locked position that can always engage with the hook,
Further, a stopper portion is provided on the receiving frame, the stopper portion engaging with a locking projection on the opposite side of the locking portion of the locking member to hold the locking position of the locking member.

With this configuration, as in the first aspect of the present invention, since the fixed engaging portion having the hook is protruded from the lid, handling such as opening / closing work of the lid and transportation is easy. Can be Further, a locking member pivotally mounted in a recess provided in the receiving frame, a locking portion engageable with the hook of the fixed engaging portion, and a locking portion interposed between the receiving frame and the hook being constantly engaged with the hook. Provide an elastic member located in a locking position that can fit,
The receiving frame is provided with a stopper that engages with the locking projection on the opposite side of the locking portion of the locking member to maintain the locking position of the locking member, so that the locking projection engages with the stopper during locking. Therefore, the lifting pressure received by the lid can be dispersed to the receiving frame, and the locked state can be reliably maintained. Therefore, the strength can be improved, and the floating and scattering of the lid can be reliably prevented.

In the present invention, the lower surface of the hook of the fixed engaging portion is formed with an inclined surface which is inclined upward toward the tip of the hook, and the upper surface of the engaging portion of the engaging member is provided with the engaging portion. It is preferable to form an inclined surface with a downward slope toward the front end side. In this case, the uphill slope and the downhill slope may be linear,
Preferably, at least one of the upward slope and the downward slope is a convex arc-shaped slope.

With this configuration, when the lid is closed, the upwardly inclined surface formed on the lower surface of the hook of the fixed engaging portion protruding from the lid and the engagement pivotally attached to the receiving frame. Since the lid is closed while sliding on the downwardly inclined surface formed on the upper surface of the locking portion of the stop member, the lid can be closed smoothly. In this case, by forming at least one of the upward slope and the downward slope with a convex arc-shaped slope, the lower surface of the hook and the upper surface of the locking portion can be brought into contact with a small contact area. Therefore, the closure of the lid can be further smoothed.

Further, when the hook and the locking portion are engaged with at least one of the engaging surfaces of the hook of the fixed engaging portion and the locking portion of the locking member, the lid is moved to the unlocking position side. It is preferable to form a slope that prevents movement, or to form a movement prevention piece that prevents the lid from moving to the unlocking position when the hook and the locking portion are engaged. (Claims 4 and 5).

With such a configuration, even when the lid attempts to move to the unlocking position in a state where the hook and the locking portion are engaged, the movement is prevented by the slope surface or the movement preventing piece. Therefore, the floating and scattering of the lid can be reliably prevented.

In addition, on the upper surface of the locking portion of the locking member,
It is preferable to form an inclined surface for preventing the fixed engagement portion from moving to the unlocking position when the lid is closed (claim 6).

With this configuration, when the lower surface of the hook of the fixed engaging portion pushes down the upper surface of the locking portion of the locking member and moves to the locking position when the lid is closed, the locking portion is moved to the locking portion. The formed inclined surface can be prevented from moving to the unlocking position side, and the closing operation of the lid can be reliably performed.

[0021]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a locking structure of a lid for an underground structure according to the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment FIG. 1 is a schematic sectional view showing a closed state of a lid for an underground structure having a locking structure according to a first embodiment of the present invention, and FIG.
FIG. 3 is an enlarged sectional view showing a portion A of FIG. 2, FIG. 4 and FIG. 5 are enlarged sectional views showing a closed state of the lid, and FIG. 6 is a locked state of the lid. FIG.

As shown in FIG. 1, the lid for an underground structure has a receiving frame 10 having a substantially circular opening 11 communicating with the underground structure, and the opening 11 of the receiving frame 10 is opened and closed. And a lid 20 pivotally fitted to the locking position and the unlocking position. In addition, lid 2
0 and the receiving frame 10 are hinged seats 31 provided on the receiving frame 10.
The cover 20 is formed to be openable and closable via a hinge 30 detachably connected to the cover 20. The hinge 3 on the lid 20
On the peripheral edge opposite to 0, a bag-shaped bur hole 40 is provided which opens outward to insert a tool K (see FIG. 3) such as a bur used when opening or closing the lid 20. .

In this case, the opening 11 of the receiving frame 10 has a taper whose diameter increases toward the upper end, and the lid 20 has a tapered surface whose diameter decreases toward the back side. The inner peripheral surface of the receiving frame 10 is fitted with a tapered surface to prevent rattling.

A fixed engaging portion 2 comprising a hanging portion 21 hanging downward and a hook 22 projecting outward from the lower end portion of the hanging portion 21 is provided on the back surface edge of the lid 20.
3 are protruded. In this case, the hook 22 has a flat engagement surface 24 formed on the upper surface, and the hook 2
2, an upwardly inclined surface 25 (hereinafter referred to as an upwardly inclined surface 25) is formed. The upward slope 25 is formed in a convex arc shape.

On the other hand, the receiving frame 10 is provided with a concave portion 12 that opens toward the center of the receiving frame 10 on the inner peripheral surface of the receiving frame 10. The shaft 1 is provided on both side walls 13 of the recess 12.
A locking member 15 is pivotally mounted on the shaft 14 so as to be rotatable in the vertical direction.

The locking member 15 has a locking portion 17 having a flat surface 16 engageable with the hook 22 of the fixed engaging portion 23.
And a weight portion 18 located at a locked position where the locking portion 17 can always be engaged with the hook 22 by its own weight. In this case, on the upper surface of the locking portion 17 of the locking member 15, a slope 19 having a downward slope toward the distal end side of the locking portion 17 (hereinafter referred to as a downward slope 19) is formed. The downward slope 19 is formed in a convex arc shape like the upward slope 25 formed on the lower surface of the hook 22. In this case, at least one of the upwardly inclined surface 25 formed on the lower surface of the hook 22 and the downwardly inclined surface 19 formed on the upper surface of the locking portion 17 may be formed in a convex arc shape. It is possible. The width of the hook 22 is formed to be about half the width of the locking portion 17.

A stopper 50 is provided at the lower portion of the recess 12 of the receiving frame 10 on the opening side to engage with the weight 18 of the locking member 15 to maintain the locking position of the locking member 15.

As shown in FIG. 1, the hinge 30 is pivotally attached to a bracket 26 provided on a peripheral edge of the back surface opposite to the fixed engaging portion 23 of the lid 20, and protrudes downward. And a locking wing piece 33 projecting slightly below the intermediate portion of the hinge body 32. The hinge seat 31 that detachably engages the hinge 30 configured as described above projects downward and inward from the inner peripheral surface of the receiving frame 10 as shown in FIGS. 7 to 9. A substantially U-shaped receiving body 36 in a plan view, comprising a pair of side pieces 34 and a connecting piece 35 for connecting the distal ends of both side pieces 34, and a receiving frame 10 facing the connecting piece 35 of the receiving body 36. Projecting above the connecting piece 35 on the inner peripheral surface side,
A catch 38 of the hinge 30 is formed by the catch 37 with which the catch wing 33 can engage. In this case, an inclined surface 39 that expands upward is provided on one side in the longitudinal direction of the connecting piece 35, and a wide portion 38 a serving as an unlocking position of the hinge 30 is formed on one side of the receiving port 38. .

The lid 20 constructed as described above is inserted into the receiving frame 1.
In order to close the inside of the opening 11, the hinge 30 side of the lid 20 is first inclined downward so that the hinge body 32 is closed.
Into the wide portion 38a of the socket 38 of the hinge seat 31. Next, after turning the lid 20 to move the hinge main body 32 to the locking position side of the receiving port 38, that is, a position outside the wide portion 38 a, as shown in FIG.
When the opposite side is dropped into the opening 11 of the receiving frame 10, the lower surface of the hook 22 of the fixed engaging portion 23 slides on the upper surface of the locking portion 17 of the locking member 15, and the weight of the weight portion 18 of the locking member 15 is reduced. The hook 22 is moved below the locking portion 17 of the locking member 15 so as to be lockable (FIG. 5). 3). At this time, at least one of the upward slope 25 on the lower surface of the hook 22 and the downward slope 19 on the upper surface of the locking portion 17 is formed as a convex arc-shaped inclined surface, so that the lower surface of the hook 22 is engaged. Sliding with the upper surface of the stopper 17 becomes smooth, and the lid 20 can be easily closed. In addition,
When the lid 20 is closed, the locking member 15 is
8 has returned to the locked position by its own weight (FIGS. 1 and 3).
reference). Therefore, the locking portion 17 of the locking member 15 is always in the locked position, and since the fixed engagement portion 23 is fixed to the lid 20, even when the receiving frame 10 is installed on an inclined road surface. Thus, the hook 22 of the fixed engaging portion 23 and the locking portion 17 of the locking member 15 can always be locked without being affected by the inclination angle of the road surface.

As described above, when the air hammer or the water hammer phenomenon occurs in the underground structure with the lid 20 closed and the lid 20 is lifted and moves upward due to the lifting pressure, FIG. As shown in FIG.
2 engages with the locking portion 17 of the locking member 15 and
Is rotated clockwise, and at this time, the weight portion 18 is
Is engaged with the stopper portion 50 provided integrally with the lock member 20, so that the lock is locked in a state where the lifting pressure received by the lid 20 is dispersed in the receiving frame 10. Therefore, both the coating that can improve the strength and the locked state can be ensured, and the floating and scattering of the lid 20 can be reliably prevented.

When the lid 20 is opened (opened), a tool K such as a special bar is inserted into the burl hole 40 to unlock the lid 20 as shown by a two-dot chain line in FIG. After turning to the position side, that is, the hinge main body 32 toward the wide portion 38a of the receiving port 38, the lid 20 can be opened (opened).

Second Embodiment FIG. 10 is a sectional view (a) showing a second embodiment of the locking structure of the present invention and a sectional view (b) taken along the line III-III of (a).
It is.

In the second embodiment, the lid 20 moves to the unlocking position when the hook 22 of the fixed engaging portion 23 and the locking portion 17 of the locking member 15 are engaged, that is, in the locked state. In this case. That is, in the second embodiment, the locking portion 17 of the locking member 15 is used.
In this case, a slope surface 27 for preventing the lid 20 from moving to the unlocking position when the hook 22 and the locking portion 17 are engaged is formed on the engagement surface with the hook 22 in FIG.

As described above, the locking portion 17 of the locking member 15
In addition, the inclined surface 2 for preventing the lid 20 from moving to the unlocking position when the hook 22 and the locking portion 17 are engaged.
7, the hook 22 of the fixed engaging portion 23 and the locking member 1 are formed as shown by a two-dot chain line in FIG.
5 can be prevented from moving to the unlocking position (in the direction of the arrow) in the locked state in which the locking portion 17 of FIG. 5 is engaged, and the hook 22 moves to the unlocking position and 20 can be reliably prevented from rising or scattering.

In the above description, the locking portion 17 of the locking member 15
Only the case where the movement preventing slope surface 27 is formed has been described, but the movement prevention slope surface is similarly formed on the surface of the fixed engagement portion 23 that engages with the locking portion 17 of the hook 22. Alternatively, a slope for preventing movement may be formed on both the hook 22 and the locking portion 17. in short,
Hook 22 of fixed engaging portion 23 and locking portion 1 of locking member 15
7 may be formed on at least one of the engagement surfaces with the inclined surface that prevents the lid 20 from moving to the unlocking position when the hook 22 and the locking portion 17 are engaged.

In the second embodiment, the other parts are the same as those in the first embodiment, and the same parts are denoted by the same reference numerals and description thereof will be omitted.

Third Embodiment FIG. 11 is a sectional view (a) showing a third embodiment of the locking structure of the present invention, and a sectional view (b) along line IV-IV in (a).

In the third embodiment, when the hook 22 of the fixed engaging portion 23 and the locking portion 17 of the locking member 15 are engaged (locked state), the lid 20 moves to the unlock position. And closing the lid 20 (closing).
In this case, the hook 22 of the fixed engaging portion 23 is securely positioned on the locking position side.

That is, in the third embodiment, when the hook 22 and the locking portion 17 are engaged with the engaging surface of the locking portion 17
Movement preventing piece 28 that prevents 0 from moving to the unlock position.
Is formed. In this case, the movement preventing piece 28
The lid 20 of the locking portion 17 is formed of a hanging piece hanging down at the end on the unlocking position side.

As described above, the locking portion 17 of the locking member 15
11 (b), by forming a movement preventing piece 28 for preventing the lid 20 from moving to the unlocking position when the hook 22 and the locking portion 17 are engaged. As shown by, in the locked state in which the hook 22 of the fixed engaging portion 23 and the locking portion 17 of the locking member 15 are engaged, the hook 22 is prevented from moving toward the unlocking position (in the direction of the arrow). It is possible to reliably prevent the hook 22 from moving to the unlocking position and the lid 20 from rising or scattering.

Further, in the third embodiment, when the lid 20 is closed, the fixed engagement portion 23 is provided on the upper surface of the engagement portion 17 of the engagement member 15.
Is formed to form an inclined surface 29 for preventing movement to the unlock position side.

As described above, by forming the inclined surface 29 on the upper surface of the locking portion 17 of the locking member 15 to prevent the fixed engaging portion 23 from moving to the unlocking position, the lid 20 is formed. When the lower surface of the hook 22 of the fixed engagement portion 23 moves downward while sliding on the upper surface of the locking portion 17 of the locking member 15 when closing (closing), the locking surface is fixed by the inclined surface for preventing movement. The joint 23 can be positively moved toward the locking position (in the direction of the arrow in FIG. 11C). Therefore, it is possible to reliably prevent the fixed engagement portion 23 from moving to the unlock position when the lid 20 is closed (closed).

In the above description, the locking portion 17 of the locking member 15
Only the case where the movement preventing piece 28 is formed has been described, but the movement preventing piece 28 may be similarly formed on the surface of the fixed engagement portion 23 that engages with the locking portion 17 of the hook 22.
Alternatively, the movement preventing pieces 28 may be formed on both the hook 22 and the locking portion 17. In short, the lid 20 is unlocked when the hook 22 and the locking portion 17 are engaged with at least one of the engagement surfaces of the hook 22 of the fixed engaging portion 23 and the locking portion 17 of the locking member 15. What is necessary is just to form the movement prevention piece 28 which prevents that it moves to a position side.

In the third embodiment, the other parts are the same as those in the first embodiment, and therefore, the same parts are denoted by the same reference numerals and description thereof will be omitted.

Fourth Embodiment FIG. 12 is an enlarged sectional view (a) showing a main part of a fourth embodiment of the locking structure of the present invention, and a sectional view (b) taken along line VV in (a). FIG. 13 is a sectional view taken along the line VI-VI of FIG.

In the fourth embodiment, a locking member 15A for urging an elastic member is used instead of the locking member 15 in the first to third embodiments.

The locking member 15A of the fourth embodiment has a flat locking portion 17 which can be engaged with the hook 22 of the fixed engaging portion 23, and is locked between the receiving frame 10 and the locking portion 17A. There is provided a coil spring 70 which is an elastic member located in a locked position in which the portion 17 can always be engaged with the hook 22. Further, the receiving frame 10 is provided on the opposite side of the locking portion 17 of the locking member 15.
Is provided with a locking projection 60 that engages with the stopper 50A provided in the locking member to maintain the locking position of the locking member.

In this case, as shown in FIG. 13, the locking members 15A are provided on both side walls 1 of the recess 12 provided in the receiving frame 10.
3, a locking member main body 61 pivotally attached to the shaft 14 so as to be rotatable in the vertical direction, a locking portion 17 bulging at one end of the locking member main body 61, and the other end of the locking member main body 61. And a locking projection 60 protruding through the step portion 62, and is formed in a substantially T-shape in plan view. The upper surface of the locking portion 17 of the locking member 15A is formed with a convex arcuate inclined surface 19 having a downward slope toward the distal end, as in the first embodiment. In addition, the locking projection 60 is provided so as to be able to engage with the upper surface of a stopper portion 50 </ b> A protruding horizontally on the upper edge side of the concave portion 12 of the receiving frame 10.

The above-mentioned coil spring 70 is shown in FIGS.
As shown in FIG. 4, a pair of coil portions 71 interposed between the locking member main body 61 and both side wall portions 13 of the concave portion 12 and wound around the shaft 14 and one ends of both coil portions 71 are connected to each other. As a result, the first engaging portion 72 engaged with the lower surface of the locking portion 17
And extending from the other ends of both coil portions 71 to form stopper portions 50.
It is formed of a spring member integrally provided with a second engaging portion 73 that engages with the lower surface of A, and constantly urges the elastic force so that the locking member 15A can maintain the locked posture. .

As described above, by forming the coil spring 70 by the pair of coil spring members interposed between the locking member main body 61 and the side walls 13 of the concave portion 12, the locking member 15A is Is held by the elastic force of the coil spring 70, so that it does not move in the direction of the shaft 14, and there is no possibility that the engagement between the hook 22 and the locking portion 17 is released during locking.

In the fourth embodiment, the other parts are the same as those in the first embodiment, and thus the same parts are denoted by the same reference numerals and description thereof will be omitted.

When closing the lid 20 having the locking structure of the fourth embodiment configured as described above, as shown in FIG.
5A is slid on the upper surface of the locking portion 17 and the locking portion 17 is retracted (rotated counterclockwise in FIG. 14) against the elastic force of the coil spring 70 so that the hook 22 of the locking member 15A It is moved below the locking portion 17 to be in a lockable state (see FIG. 12). At this time, at least one of the upward slope 25 on the lower surface of the hook 22 and the downward slope 19 on the upper surface of the locking portion 17 is formed as a convex arc-shaped inclined surface, so that the lower surface of the hook 22 is engaged. Sliding with the upper surface of the stopper 17 becomes smooth, and the lid 20 can be easily closed. When the cover 20 is closed, the locking member 15
A has returned to the locked position by the elastic force of the coil spring 70 (see FIG. 12). Therefore, the locking member 15A
Is always in the locked position and the lid 20
The fixed engaging portion 23 is fixed to the hook 2 of the fixed engaging portion 23 without being affected by the inclination angle of the road surface even when the receiving frame 10 is installed on an inclined road surface.
2 and the locking portion 17 of the locking member 15A are always in a lockable state.

When the air hammer or the water hammer phenomenon occurs in the underground structure in the state where the lid 20 is closed as described above, and the lid 20 is lifted up and moves upward, FIG. As shown in FIG. 7, the hook 22 of the fixed engaging portion 23 engages with the locking portion 17 of the locking member 15A to rotate the locking member 15A clockwise.
Engages with the stopper portion 50 </ b> A provided integrally with the receiving frame 10, so that the lock is applied in a state where the lift received by the lid 20 is dispersed in the receiving frame 10. Therefore, the strength can be improved and the locked state can be ensured.
Can be reliably prevented from floating or scattering.

Fifth Embodiment FIG. 16 is an enlarged sectional view (a) showing a main part of a fifth embodiment of the locking structure of the present invention, and a sectional view (b) along line VII-VII of (a). is there.

The fifth embodiment prevents the fixed engagement portion 23 from moving to the unlock position when the lid 20 is closed on the upper surface of the engagement portion of the engagement member 15A in the fourth embodiment. This is a case where the inclined surface 29 is formed to surely prevent the fixed engagement portion 23 from moving to the unlocking position when the lid 20 is closed (closed).

In the fifth embodiment, the other parts are:
Since it is the same as the first and fourth embodiments, the same parts are denoted by the same reference numerals, and description thereof will be omitted.

Other Embodiments (1) In the second embodiment, the locking portion 1 of the locking member 15
7, the case where the inclined surface 27 for preventing movement is formed is described. However, similarly to the third embodiment, the fixed engaging portion 23 is provided on the upper surface of the locking portion 17 of the locking member 15 on the unlocking position side. By forming the inclined surface 29 that prevents movement to
When the lid 20 is closed (closed), when the lower surface of the hook 22 of the fixed engaging portion 23 moves downward while sliding on the upper surface of the locking portion 17 of the locking member 15, an inclination for preventing movement is provided. The fixed engagement portion 23 can be positively moved to the locking position side by the surface 29. Therefore, it is possible to reliably prevent the fixed engaging portion 23 from moving to the unlocking position when the lid 20 is closed (closed) and locked.

(2) In the fourth embodiment, the locking member 1
The case where the locking portion 17 of 5A is formed in a flat shape has been described, but as shown in FIG.
A locking surface 17 for preventing movement of the lid 20 to the unlocking position side when the hook 22 and the locking portion 17 are engaged with each other, or
As shown in FIG. 17B, the locking portion 17 of the locking member 15
Alternatively, a movement preventing piece 28 for preventing the lid 20 from moving to the unlocking position when the hook 22 and the locking portion 17 are engaged may be formed.

With this configuration, it is possible to reliably prevent the fixed engaging portion 23 from moving to the unlocking position during locking.

(3) In the fifth embodiment, the locking member 1
The case where the inclined surface 29 for preventing the fixed engaging portion 23 from moving to the unlocking position side is formed on the upper surface of the locking portion 17 of 5A has been described, but as shown in FIG. Whether to form a slope 27 for preventing movement of the lid 20 to the unlocking position side in a state where the hook 22 and the locking part 17 are engaged with the locking part 17 of the locking member 15A. Alternatively, as shown in FIG. 18B, the lid 20 moves to the unlocking position when the hook 22 and the locking portion 17 are engaged with the locking portion 17 of the locking member 15. May be formed.

As described above, the locking portion 17 of the locking member 15A
An inclined surface 29 for preventing the fixed engaging portion 23 from moving to the unlocking position side is formed on the upper surface of the lock member 15A.
When the lid 20 is closed (closed) and locked when the lid 20 is closed (closed) and locked, the fixed engaging portion 23 moves to the unlock position. Can be reliably prevented.

[0063]

As described above, since the present invention is configured as described above, the following excellent effects can be obtained.

(1) According to the first aspect of the present invention, since the fixed engaging portion having the hook is protruded from the lid, even when the lid for the underground structure is installed on an inclined road surface, the inclined portion is provided. The hook does not enter the unlocked state due to the inclination angle of, and the locked state can be reliably maintained. In addition, compared to a structure in which an engaging member having a hook is swingably connected to the lid, handling such as opening / closing work of the lid and transportation can be facilitated. The locking member pivotally mounted in the recess provided in the receiving frame has a locking portion capable of engaging with the hook of the fixed engaging portion, and a locking position in which the locking portion can always engage with the hook by its own weight. Since the weight portion is provided, the number of constituent members can be reduced. Further, since the weight of the locking member is engaged with the stopper provided on the receiving frame during locking, the lift received by the lid can be dispersed to the receiving frame, and the locked state can be reliably maintained. Therefore, the strength can be improved, and the floating and scattering of the lid can be reliably prevented.

(2) According to the second aspect of the present invention, similarly to the first aspect of the present invention, since the fixed engaging portion having the hook is provided on the lid, the lid for the underground structure is inclined. Even if the hook is installed on a road surface, the hook does not enter the unlocked state depending on the inclination angle, and the locked state can be reliably maintained. In addition, compared to a structure in which an engaging member having a hook is swingably connected to the lid, handling such as opening / closing work of the lid and transportation can be facilitated. Further, since the locking projection engages with the stopper during locking, the lifting pressure received by the lid can be dispersed to the receiving frame, and the locked state can be reliably maintained. Therefore, the strength can be improved, and the floating and scattering of the lid can be reliably prevented.

(3) According to the third aspect of the present invention, when closing the lid, the lower surface of the hook of the fixed engaging portion protruding from the lid and the locking member pivotally attached to the receiving frame. Since the lid is closed while sliding on the up slope and the down slope with a small contact area formed on the upper surface of the locking portion, in addition to the above (1) and (2), Further, the closing operation of the lid can be facilitated.

(4) According to the invention described in claims 4 and 5,
In the state where the hook and the locking portion are engaged, even if the lid moves to the unlocking position side, the movement can be prevented by the slope surface or the movement preventing piece. In addition to 3), the floating and scattering of the lid can be reliably prevented.

(5) According to the invention, when the lid is closed, the lower surface of the hook of the fixed engaging portion pushes down the upper surface of the locking portion of the locking member and moves to the locking position. In addition, since the inclined surface formed in the locking portion can prevent movement to the unlocking position side, in addition to the above (1) to (4), it is possible to more reliably perform the closing operation of the lid. it can.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a closed state of a lid for an underground structure having a locking structure according to a first embodiment of the present invention.

FIG. 2 is a plan view of a receiving frame according to the present invention.

FIG. 3 is an enlarged sectional view showing a portion A in FIG. 1;

FIG. 4 is an enlarged cross-sectional view illustrating a closed state of a lid according to the first embodiment.

FIG. 5 is an enlarged cross-sectional view showing a state in which a fixed engaging portion and a locking member are in contact with each other when the lid is closed.

FIG. 6 is an enlarged sectional view showing a locked state of the lid.

FIG. 7 is an enlarged plan view showing a portion B in FIG. 2;

FIG. 8 is a side view of FIG. 7;

9A and 9B are cross-sectional views taken along the line II of FIG.
FIG. 2 is a sectional view taken along line II-II of FIG.

FIGS. 10A and 10B are an enlarged sectional view showing a locking structure according to a second embodiment of the present invention, and a sectional view taken along line III-III of FIG.

FIGS. 11A and 11B are an enlarged sectional view showing a locking structure according to a third embodiment of the present invention, and a sectional view taken along line IV-IV of FIG.

FIGS. 12A and 12B are enlarged cross-sectional views showing a locking structure according to a fourth embodiment of the present invention, and FIGS. 12A and 12B are cross-sectional views taken along line VV in FIG.

FIG. 13 is a sectional view taken along the line VI-VI of FIG.

FIG. 14 is an enlarged sectional view showing a closed state of a lid according to a fourth embodiment.

FIG. 15 is an enlarged sectional view showing a locked state in the fourth embodiment.

FIG. 16 is an enlarged sectional view (a) showing a locking structure according to a fourth embodiment of the present invention, and a sectional view (b) along line VII-VII of (a).

FIG. 17 is a sectional view showing a modification of the locking member according to the fourth embodiment.

FIG. 18 is a cross-sectional view illustrating a modification of the locking member according to the fifth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Receiving frame 11 Opening 12 Depression 13 Side wall part 14 Shaft 15 and 15A Locking member 17 Locking part 18 Weight part 19 Downslope slope 20 Lid 21 Hanging part 22 Hook 23 Fixed engagement part 25 Upslope slope 27 Stop of movement Inclined surface 28 Movement preventing piece 29 Movement inclined surface 30 Hinge 50, 50A Stopper 60 Locking projection 70 Coil spring (elastic member)

Claims (6)

[Claims] 1. A receiving frame having a substantially circular opening, a lid that opens and closes the opening of the receiving frame, and is rotatably fitted to a locking position and an unlocking position with respect to the receiving frame. A lid for an underground structure having a hinge that is openably and closably connected to a receiving frame, wherein a lower part hanging down on a rear edge of the lid and a lower part of the lower part extending outward from a lower end of the lower part. A fixed engaging portion comprising a protruding hook is protrudingly provided, and the receiving frame is rotatably pivotally mounted on a shaft opening on both side walls of the concave portion opening on the inner peripheral surface of the receiving frame. A locking member provided on the locking member; a locking portion capable of engaging with the hook of the fixed engaging portion; and a weight located at a locking position where the locking portion can always be engaged with the hook by its own weight. And the receiving frame is engaged with the weight of the locking member to maintain the locking position of the locking member. Locking structure of underground structures lid to the stopper portion is provided, characterized in that. 2. A receiving frame having a substantially circular opening, a lid that opens and closes the opening of the receiving frame, and is rotatably fitted to a locking position and an unlocking position with respect to the receiving frame. A lid for an underground structure having a hinge that is openably and closably connected to a receiving frame, wherein a lower part hanging down on a rear edge of the lid and a lower part of the lower part extending outward from a lower end of the lower part. A fixed engaging portion comprising a protruding hook is protrudingly provided, and the receiving frame is rotatably pivotally mounted on a shaft opening on both side walls of the concave portion opening on the inner peripheral surface of the receiving frame. A locking member, wherein the locking member is provided with a locking portion capable of engaging with the hook of the fixed engaging portion, and the locking portion is interposed between the receiving frame and the locking portion is always engaged with the hook. And an elastic member positioned in a locking position capable of locking the locking member. It engages the side of the locking protrusion provided stopper portion for holding the locking position of the locking member, the locking structure of the underground construction for the lid, characterized in that. 3. The locking structure for a cover for an underground structure according to claim 1, wherein a lower surface of the hook of the fixed engaging portion is formed with an inclined surface having an upward slope toward a tip end of the hook. A locking structure for a lid for an underground structure, wherein a slope is formed on an upper surface of a locking portion of a locking member, and the slope is formed to be inclined downward toward a tip end of the locking portion. 4. The underground structure lid locking structure according to claim 1, wherein at least one of an engagement surface between the hook of the fixed engagement portion and the locking portion of the locking member. A locking structure for a lid for an underground structure, wherein a slope is formed to prevent the lid from moving to the unlocking position when the hook and the locking portion are engaged. 5. The locking structure for an underground structure lid according to claim 1, wherein at least one of an engagement surface between the hook of the fixed engagement portion and the locking portion of the locking member. A lock structure for a lid for an underground structure, wherein a movement preventing piece is formed to prevent the lid from moving to the unlocking position when the hook and the locking portion are engaged. 6. The locking structure for a cover for an underground structure according to claim 1, wherein the fixed engaging portion is unlocked on an upper surface of the locking portion of the locking member when the lid is closed. A locking structure for a lid for an underground structure, wherein an inclined surface for preventing movement to a position side is formed.