JP2010285822A - Lock device for cover for underground structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To cut waste in the structure and movements of a lock member for locking a cover to a receiving frame, and to enable rational and stable vertical movements of the lock member along a guide and rotational movements thereof in inward and outward directions with respect to the receiving frame, at all times. <P>SOLUTION: In order to make rotational displacement of the lock member, for locking the cover, in inward and outward directions with respect to the receiving frame necessary, sufficient and unwasted, the lock member includes a short hook part and a long lock body, and the hook part is supported, by means of a shaft, to an upper end of the lock body by a pin to be rotatable in the inward and outward directions with respect to the receiving frame. Further, a sliding part of the lock body comprising a mounting frame and the sliding part is slidably held between the guide and an inner peripheral surface of the receiving frame so that the lock member can vertically move along the guide. An urging force is applied to a lower surface of the hook part by a pressing spring to lock the cover, and a front end shaft part of a link mechanism, of which an end is supported to the inner peripheral surface of the receiving frame by means of a shaft, is inserted into a space in the mounting frame to restrict the range of rise of the lock member. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a locking device for a lid for an underground structure for locking a lid in an underground structure such as a manhole to a receiving frame, and in particular, a locking member in the device is disposed on the inner peripheral surface side of the receiving frame. In order to lock the door, it is possible to eliminate the waste of the structure and movement of the lock member, and always perform rational and stable vertical movement and rotation or tilting, that is, rational and stable operation of locking and unlocking the lid. The present invention relates to a lock device for an underground structure lid.

  As a conventional locking device for a lid for an underground structure that arranges such a lock member on the inner peripheral surface side of the receiving frame and locks the lid, for example, as described in Japanese Patent No. 3449608 (Patent Document 1) And those described in Japanese Patent No. 3746259 (Patent Document 2) are known. Each structure and its problems are shown below.

  In the device described in Patent Document 1, a collar member 15 as a lock member that locks the lid 12 with respect to the receiving frame 11 has a collar portion 16 integrally with an upper end of a vertically long collar 17, and a collar following that A long hole bearing 18 is formed in the lower part of the flange.

The shaft portion 21 at the tip end of the other end of the shaft member 20 having the mounting base end portion pivotally attached to the inner peripheral surface side of the receiving frame 11 is fitted into the long hole bearing portion 18 of the flange member 15. The eaves member 15 is provided so as to be movable in the vertical direction along a guide portion 19 provided on the inner surface side of the receiving frame 11. Therefore, the flange member 15 is engaged with the shaft portion 21 at the distal end of the shaft member 20 extending from the inner surface side of the receiving frame 11 by the engagement of the long hole bearing portion 18 with the upper end portion and the lower end portion of the long hole bearing portion 18. Within the range, it can be moved up and down along the guide portion 19.
Further, the flange member 15 is urged by the elastic body 26 of the torsion spring in the direction in which the flange portion 16 at the upper end is directed from the inside of the receiving frame 11 to the outside, that is, the direction in which the lid 12 is locked. By the outward rotation (tilting) of the flange member 15 by the urging force, the flange portion 16 at the upper end engages with a locking portion 27 provided on the lower inner side of the falling portion 28 at the periphery of the lid body 12 and the lid body. 12 locks are possible.

When the lid 12 is locked, the lid 12 is lowered to close the upper opening of the receiving frame 11. As the lid 12 descends into the receiving frame 11, the lower surface of the falling portion 28 at the periphery of the lid 12 comes into contact with the slope of the upper surface of the head of the collar 16, and the collar member 15 resists the elastic force of the biasing means 26. When the lid 12 is further moved downward by being pushed inwardly toward the center side of the receiving frame 11, the peripheral falling portion 28 enters between the flange 16 and the inner peripheral surface of the receiving frame 11. When the lid 12 is supported and housed on the tapered surface of the inner peripheral surface of the receiving frame 11, the flange member 15 moves forward (rotates) toward the outside of the receiving frame 11 by the elastic force of the biasing means 26, and the flange portion 16. And the locking portion 27 inside the peripheral edge of the lid 12 are engaged with each other, and the lid 12 is locked.
At this time, the flange member 15 is positioned below the receiving frame 11 so as to lock the lid 12, and has a long-hole bearing on the upper surface of the shaft portion 21 at the tip of the shaft member 20 extending from the inner peripheral surface of the receiving frame 11. The upper end portion of the portion 18 is in contact with the lowering along the guide portion 19 and the flange member 15 is engaged with the upper end portion of the bearing portion 18 and the shaft portion 21 from the receiving frame 11. Centering on the frame 11, the receiving frame 11 can be turned (tilted) inward and outward.

  When unlocking the lid 12, the lid 12 is pulled upward using an opening tool. At this time, since the hook member 15 is connected to the lower side of the lid body 12 through the engagement between the locking portion 27 of the lid body 12 and the flange portion 16, the lid body 12 follows the upward lifting of the lid body 12. The eaves member 15 also moves up along the guide portion 19. The upward movement along the guide portion 19 of the flange member 15 is caused by the sliding until the lower end portion of the bearing portion 18 of the long hole comes into contact with the lower side surface of the shaft portion 21 at the tip of the shaft member 20 from the receiving frame 11 and the contact. This is done until the shaft member 20 is lifted by an appropriate angle of rotation upward as the shaft member 20 is pushed up. When the upward movement of the eaves member 15 along the guide portion 19 stops and the lid body 12 coupled thereto is lifted up above the receiving frame 11, the lid body 12 is pulled out toward the outside of the receiving frame 11. If it is moved horizontally, the engagement between the flange portion 16 and the locking portion 27 of the lid body 12 is released, and the locking of the lid body 12 is released. At this time, the eaves member 15 descends along the guide portion 19 due to its own weight, falls to the lower side of the guide portion 19 to prepare for locking with the next lid body 12, and the upper end portion of the bearing portion 18 of the elongated hole is the shaft portion 21. Stops in contact with the upper side.

  Therefore, in the apparatus described in Patent Document 1, the structure of the collar member 15 as a locking member for locking the lid body 12 is long as the collar section 16 that engages with the locking section 27 of the lid body 12 as described above. Since the vertically long flange 17 having the bearing portion 18 of the hole and sliding in the vertical direction along the guide portion 19 is integrally formed, there is the following difficulty.

1) The lid 12 is locked by the biasing force of the eaves member 15 due to the action of the lowering of the lid 12 and the action of the biasing force of the torsion spring 26 until the lid 12 is housed in the inner peripheral surface of the opening of the receiving frame 11. The hook-like flange 16 at the upper end of the flange member 15 and the locking portion of the lid 12 by the backward rotation of the receiving frame 11 against the inner side and the forward rotation of the receiving frame 11 pushed by the urging force. 27 is engaged. At this time, the eaves member 15 is stopped at the position of the lower side of the guide portion 19, and the retreating and forward rotation of the receiving frame 11 in the inner and outer directions is the shaft portion 21 of the shaft member 20 extending from the inner peripheral surface of the receiving frame 11. And the engagement point between the elongated hole bearing portion 18 and the upper end portion thereof. The flange member 15 connected to the lid body 12 is configured to be movable up along the guide portion 19.
Thus, since the collar member 15 as the lock member is an integral structure of the collar portion 16 at the upper end and the vertically elongated collar 17 having the bearing portion 18 therebelow, the locking of the lid 12 is performed. In order to rotate the flange member 15 in the inner and outer directions of the receiving frame 11, the entire flange member 15 must be involved. That is, not only the flange portion 16 at the upper end portion but also the guide portion 19 below it. Even the portion of the vertically long ridge 17 that moves up and down along the axis is in a state related to the rotation for locking.
For this reason, the rotational displacement of the lock member necessary for the engagement between the hook-shaped flange portion 16 and the engaging portion 27 of the lid body 12 must be larger than necessary. It is not intended, but includes a useless part (configuration waste).
Thus, since the entire flange member 15 must be rotated for locking the lid body 12, between the guide portion 19 whose tip is bent in an L shape and the inner peripheral surface of the receiving frame 11, It is not sufficient to simply provide a gap with a width that allows the collar member 15 (the collar 17) to slide, and it is necessary to provide a wide gap that allows rotational displacement of the entire collar member 15. There is.
Therefore, due to the presence of the wide gap portion, there is a possibility that the vertical movement of the eaves member 15 along the guide portion 19 (especially the descent movement due to its own weight) may be staggered, and along the guide portion 19 of the momentary eave member 15 There is a risk of lack of stability in vertical movement (the waste of movement and the risk of instability of vertical movement along the guide portion 19 of the flange member 15).
Further, if it is necessary to provide a wide gap between the guide portion 19 and the inner peripheral surface of the receiving frame 11 to permit the rotational displacement of the entire flange member 15, the thickness of the L-shaped bent portion at the tip of the guide portion 19 There is a possibility that a gap portion sufficient to allow the rotational displacement cannot be obtained due to the variation in the dimensional accuracy of the width of the flange 17. Then, the smooth up-and-down movement of the eaves member 15 along the guide portion 19 is impaired, and the elevating member 15 rises up until the lid 12 necessary for unlocking the lid 12 is raised above the receiving frame 11. There is a possibility that it is difficult to ensure the range of movement (there is a difficulty in securing the ascending range along the guide portion of the flange member 15 necessary for unlocking the lid 12).
2) When the cover 12 is locked, when the internal pressure of an underground structure such as a manhole rises and the cover 12 is pushed up and floats above the receiving frame 11, the saddle member coupled to the cover 12 15 also rises along the guide portion 19 following this, the lower end portion of the bearing portion 18 contacts the shaft portion 21 of the shaft member 20 and pushes it up, and the shaft member 20 is set around the attachment base end portion. The lift of the eaves member 15 is stopped by slightly rotating upward to the rotation limit.
In this state, the vertically long eaves member 15 is rotatable inward and outward of the receiving frame 11 around the engagement point between the lower end portion of the bearing portion 18 of the elongated hole and the shaft portion 21 of the shaft member 20. The center of gravity of the longitudinal elongate member 15 is located substantially above the pivot center point, and the engagement point between the engaging portion 27 of the lid 12 and the eaves portion 16 of the eave member 15 (from the engaging portion 27 side to the eaves portion). 16 is located closer to the outer side of the receiving frame 11 than the pivot center point of the flange member 15. For this reason, when the lid 12 is pushed up by the internal pressure, the pressing force acts in a direction in which the flange member 15 is rotated backward and inward of the receiving frame 11.
Accordingly, when the lid body 12 is swung in the vertical direction at a high speed due to the impact vibration of the vehicle passing over the lid body 12 when the lid body 12 is lifted by the internal pressure, the flange portion 16 is engaged with the locking portion 27 of the lid body. The hook member 15 is easily retracted and rotated to the inner side of the receiving frame 11, and as a result, the locking of the lid body 12 is naturally released and the lid body may be scattered.
(When the lid floats due to an increase in internal pressure, there is a risk of unlocking due to shock vibration when passing through the vehicle).
3) In addition, the biasing force applied to the lock member necessary for locking the lid body 12 is not only the hook-shaped flange portion 16 at the upper end portion but also a vertically long and long shape composed of the flange portion 16 and the flange 17. It must be applied to the entire heavy flange member 15, and in the direction in which the flange member 15 unlocks the lid as described above, based on the positional relationship between the pivot center point and the center of gravity of the entire flange member 15. Since there is a possibility of being easily tilted, it is necessary to use a strong torsion spring as a biasing means using a spring for imparting momentum, and it has to be a large-scale one requiring considerable contrivance for assembly.
In addition, the torsion spring 26 is wound around the shaft portion 21 at the tip of the shaft member 20 that engages with the bearing portion 18 and is exposed to the outside when the lid 12 is opened. There was also a risk of damage.

  On the other hand, also in the thing of patent document 2, in order to lock the cover body 2, it describes in the said patent document 1 on arrangement | positioning structure of the key member 15 as a lock member provided in the inner peripheral surface side of the receiving frame 1. Has almost the same problems as

That is, the key member 15 has a hook-shaped flange portion at the upper end portion, and is provided with a long hole 17 for a bearing in a vertically long casing portion integrally formed below the hook member 15.
Thus, the long holes 17 for bearings are loosely fitted on the bolts 16 hung on the lower side of the frame body 14. Accordingly, the key member 15 is movable in the vertical direction within the range of the long hole 17 with respect to the bolt 16 on the lower side of the frame body 14, and the upper end or lower end of the bolt 16 and the long hole 17. The bolt 16 can be rotated in the circumferential direction about the contact engagement point. The key member 15 is provided with a tension spring 24 as an urging force for locking the lid body 2 through engagement with the locking piece 12 on the back surface of the lid body 2.

Therefore, when the lock member 15 having such a structure is used to lock the center portion of the receiving frame and the lid body in the inner and outer direction toward the outside, the lock in the above-mentioned Patent Document 1 is used. Through engagement with the lid 12 using a member 15 (which is formed by integrally joining the flange 16 at the upper end and the flange 17 therebelow and forming a long-hole bearing 18 in the flange 17). This is the same as the case where the lock is made.
Therefore, the key member 15 in Patent Document 2 corresponds to the flange member 15 in Patent Document 1, and therefore has substantially the same problem as that of Patent Document 1 described above.

Japanese Patent No. 3449608 Japanese Patent No. 3746259

  The present invention has been made in view of such a situation, and by making the arrangement structure of the lock member simple and specially devised, the lock member can be moved vertically and rotated or tilted to lock the lid. The above-described prior art described in Patent Document 1 or Patent Document 2, which is associated with the necessity of turning or tilting displacement to be unnecessarily large, eliminates the various disadvantages that the prior art described in Patent Document 1 or Patent Document 2 has. It eliminates wasteful movement and always enables rational and stable vertical movement and rotation or tilting. In other words, the lid for underground structures that can always perform rational and stable locking and unlocking operations. An object of the present invention is to provide a body locking device.

  The present invention employs the following means described in the claims in order to achieve the above-described objects or objects.

That is, in the invention according to claim 1, “the upper opening portion of the receiving frame is connected to the opening portion of the receiving frame so as to be openable / closable and pivotable, and the other end portion on the opposite side to the hinge portion. A locking device for the receiving frame of the lid provided between the lid provided with an opening / closing burl hole in which the lower part of the hole is closed like a bag hole and the receiving frame whose upper opening is closed by the lid Because
A lock member for locking the lid body, a vertical movement along a guide portion disposed on the inner peripheral surface side of the receiving frame, a rotation of the lock member in the inner and outer directions, and a lock member that is applied to the lock member Energizing force by a spring that brings the lid into a locked state through engagement with a locking portion inside the lid peripheral edge, and outward of the receiving frame of the lid that is engaged with the lock member and lifted to the upper side of the receiving frame In the locking device for the lid for an underground structure that locks and unlocks the lid through engagement and disengagement between the locking member and the locking portion inside the lid peripheral edge with the drawer to
The locking member that locks the lid body is required to be pivotally displaced in and out of the receiving frame in a direction that is necessary, sufficient, and rational, and can be moved up and down along the guide portion of the locking member and inward and outward of the receiving frame. In order to enable rational and stable rotation of the
The lock member is divided into a hook part that is short and responsible for turning the receiving frame in and out, and a lock part that is long and responsible for vertical movement along the guide part.
The sliding part of the long lock part main body formed by a mounting frame having an internal space part and a sliding part attached to the outside of the side face of the receiving frame inner peripheral surface and a guide part whose tip is bent in an L shape There is an arrangement structure that is movable in the vertical direction along the guide portion of the lock member by being slidably held between them,
A long hook portion that moves up and down along this guide portion is pivotally supported by a pin so that the short hook portion can be pivoted inward and outward of the receiving frame by a pin. With a pivotable arrangement structure,
Engage the hook part with the locking part on the inner side of the lid body against the lower surface of the short hook part by the pressing coil spring housed in the storage part attached to the outside of the side of the mounting frame in the long lock part body Through which a biasing force is applied to bring the lid into a locked state,
And, in order to release the locking of the lid body through the engagement and disengagement between the hook portion and the locking portion inside the lid peripheral portion in accordance with the drawing of the lid body above the receiving frame to the outside of the receiving frame. In the inner space of the mounting frame in the lock body, the other end of the link mechanism is pivotally attached to the inner peripheral surface of the receiving frame so that it can be pivoted in the vertical direction within an appropriate angle range. By restricting the ascending range of the vertical movement along the guide portion of the lock member by inserting and fitting the shaft portion, it is characterized by the above-mentioned.

  In the invention according to claim 2, in order to prevent the malfunction of the spring for biasing the hook portion due to the intrusion of rainwater, earth and sand, etc. with the passage of time, the “cap on the short hook portion of the lock member is covered. As a storage part attached to the outside of the side of the mounting frame in the long lock part main body that stores the pressing coil spring that gives the urging force to make the body locked, the spring that drops the earth and sand that entered along with rainwater downward In order to prevent the accumulation of the slag around and prevent the urging force from deteriorating, it is a through hole penetrating in the vertical direction.

  In the invention according to claim 3, the material of the structural member is further devised, and in order to further stabilize the operation, “the member relating to the sliding of the lock member in the vertical direction between the inner peripheral surface of the receiving frame and the guide portion” The long lock body of the lock member is a typical precision casting method, so that the influence of the dimensional accuracy of the lock member is smaller and the lock member can move more stably up and down along the guide portion. It is manufactured from a stainless steel casting cast by the wax manufacturing method, and the short hook portion is manufactured from high-strength spheroidal graphite cast iron ".

  The invention according to claim 4 shows an example of another embodiment relating to the structure of the hook portion that can obtain the same effect, and “the upper end of the long lock portion main body is connected to the receiving frame via a pin. As a short hook portion pivotally supported so as to be pivotable inward and outward, a hook portion in which two hook portions are juxtaposed side by side with a connecting rod is used.

  In the present invention, the arrangement structure of the lock member that locks the lid is simplified and specially devised to achieve the above-described configuration, so that the problems associated with the prior art described above are eliminated, and the present invention is as follows. It is possible to achieve a unique effect.

In the invention according to claim 1, as the lock member that puts the lid into a locked state, the hook portion that is short and bears rotation in the inside and outside of the receiving frame and the long and bears vertical movement along the guide portion. The lock part main body is formed separately, and a short hook part is pivotally supported at the upper end of the long lock part main body by a pin so as to be rotatable inward and outward of the receiving frame.
Then, the hook part is pressed and urged to the outer side of the receiving frame by a pressing coil spring housed in a storage part attached to the lock part main body on the lower side of the hook part opposite to the upper end part of the lock part main body. The lid is locked through the engagement between the inner portion and the inner locking portion of the lid, and a mounting frame having a space inside as a long lock portion main body and a slide portion attached to the outside of the side surface The sliding portion is slidably sandwiched between the inner peripheral surface of the receiving frame and the tip L-shaped bent portion of the guide portion, and in the inner space of the mounting frame of the lock portion main body. The upper end shaft portion of the link mechanism that extends from the inner peripheral surface of the receiving frame and is pivotable in an up-and-down direction at an appropriate angle is fitted to restrict the rising range of the vertical movement along the guide portion of the lock member. is there. Therefore, the following specific effects can be obtained.
1) In this way, unlike the conventional case, the hook part that engages with the engaging part inside the peripheral part of the lid body and the lock part main body that is rotatably joined to the upper end part via a pin are integrated. Rather than being separately divided, the lock member is pivoted in the inner and outer directions exclusively by the short hook portion, and the vertical movement along the guide portion is exclusively composed of the mounting frame and the slide portion. The long lock body is in charge. Therefore, unlike the conventional one described in Patent Document 1, the lock portion main body does not involve not only the vertical movement along the guide portion but also the rotation of the receiving frame in the inner and outer directions. It is not necessary to provide a wide gap between the inner surface of the bent part and the inner peripheral surface of the receiving frame, and the gap part allows the lock part body of the lock member to slide in the vertical direction exclusively during that time. Setting is sufficient.
For this reason, there is no inconvenience that the locking member moves up and down along the guide portion, and the up-and-down movement is performed stably.
In addition, unlike the case where a wide gap that allows the rotational displacement of the lock member is required, the lock member can be smoothly moved up and down along the guide due to the variation in the dimensional accuracy of the structural member related to sliding in the vertical direction. Inconvenience that the movement is impaired, so that it is difficult to secure a predetermined lifting range required for the lock member that lifts the lid necessary for unlocking the lid to the upper side of the receiving frame, and the unlocking operation of the lid is hindered. Nor.
And since the rotation of the receiving frame of the lock member necessary for locking the lid body in the inner and outer directions is performed exclusively by the short hook portion pivotally supported by the upper end portion of the long lock portion main body, In contrast, there is no inconvenience or waste that the rotational displacement of the lock member has to be larger than necessary, and it is possible to take the rotational displacement in the range necessary and sufficient for locking the lid. It is possible to efficiently and reasonably and stably rotate the inside and outside of the door.
2) The center of rotation of the lock member that locks the lid is a connecting pin that pivotally supports the short hook part at the upper end of the long lock part body. It does not correspond to the engaging portion between the upper end portion or the lower end portion of the eaves long hole bearing portion 18 as the lock portion main body and the shaft portion 21 extending from the inner peripheral surface of the receiving frame like the one described in the literature 1.
The tip shaft part of the link mechanism that is fitted in the space in the mounting frame of the lock part main body and extends from the inner peripheral surface of the receiving frame is engaged with the hook part to form the center of rotation for turning the hook part. Instead, it is intended to regulate the range of the upward and downward movement of the lock member exclusively along the guide portion.
Therefore, the short hook portion can move up and down within the range of the bearing portion 18 of the long hole with respect to the shaft portion 21 from the inner peripheral surface of the receiving frame 11 like the long rod member 15 having the conventional flange portion 16. The positional relationship of the engagement of the pivot pin (joining pin), which is the rotation center point, with the short hook portion does not change. Therefore, when the lid is locked and unlocked, there is no change in the positional relationship between the rotation center point of the lock member and the center of gravity as in the prior art, and there is no inconvenience associated therewith. In the conventional lock member (saddle member 15), when the lid 12 is locked, the engaging portion between the shaft portion 21 extending from the inner peripheral surface of the receiving frame and the upper end portion of the long-hole bearing portion 18 in the flange 17 is the center. Since the center of gravity as the lock member is located substantially below the center of rotation, since the lock member is unlocked, the lock member is lifted to lift the long hole. The center of gravity as a long lock member is considerably higher than the center of rotation, because it can be turned inward and outward about the engaging portion between the lower end of the bearing 18 and the shaft 21. It will be in a position. When the engagement point between the flange portion 16 and the locking portion 27 of the lid body 12 is located closer to the outer side of the receiving frame 11 than the rotation center point of the flange member 15, and pressure is applied to the engagement point from below. The pressure acts in a direction in which the eaves member 15 is rotated backwardly toward the inner side of the receiving frame 11. Therefore, the lock member (the heel member 15) is located on the inner side of the receiving frame 11 (the lid body is locked) due to the positional movement relationship between the rotation center and the center of gravity and the pressure acting on the engagement point between the lid body and the heel member. It is easy to be tilted in the direction of release). Therefore, as described above, conventionally, when the lid body 12 is lifted by internal pressure, when the lid body 12 swings in the vertical direction due to the impact vibration of the vehicle passing over the lid body 12, 16 is disengaged from the engaging portion 27 of the lid body 12, and the eaves member 15 is easily retracted and rotated inward of the receiving frame 11. As a result, the locking of the lid body 12 is naturally released by the increase in internal pressure. This may lead to the possibility of the lid scattering.
However, in the present invention, there is no such a risk due to the above-described configuration.
In other words, in the present invention, the hook part exclusively responsible for the rotation of the receiving frame of the lock member in the inward / outward direction is shorter than the lock part body that is set to be long because it is exclusively responsible for vertical movement along the guide part. In addition to being set to a small size, it is pivotally supported at the upper end of the lock portion main body by a joining pin so as to be rotatable inward and outward of the receiving frame. Therefore, even the long lock portion main body is not involved in the rotation of the lock member, and the hook portion responsible for the rotation moves up and down through the elongated hole with respect to the rotation center joint pin. Therefore, there is no misalignment between the center of rotation and the center of gravity of the hook when the lid is locked and unlocked. The engaging portion with the hook portion is not positioned to be shifted toward the outer side of the receiving frame with respect to the rotation center of the hook portion, and both can be set and arranged in the vertical direction of a substantially close position in the horizontal direction. it can. Therefore, the weight balance of the hook part with respect to the center of rotation can be maintained well, the rotational displacement of the lock member in the inner and outer directions is not increased more than necessary, and the rational necessary and sufficient for locking the lid. The hook part can be set to belong to a certain range, and the hook part is not easily rotated backward inward toward the center side of the receiving frame. The lid can be locked and unlocked efficiently and stably, and unlike the conventional case, even when the lid is lifted due to an increase in internal pressure, even if it receives impact vibrations passing through the vehicle, the hook and lid There is no possibility of inconvenience that the engagement with the cover naturally disengages and the lid body scatters.
3) The urging force applied to the lock member for locking the lid does not need to be applied to the entire lock member as in the prior art, and is set to a short and small size that bears rotation of the receiving frame in and out. It only needs to be applied to the hook part, the weight balance with respect to the center of rotation of the hook part can be maintained well, and the hook part rotates backward inward in the center direction of the receiving frame (the lid is locked) Therefore, the use of a strong torsion spring is required and the load of the biasing means is not applied more than necessary. Even with the use of a small spring coil spring, it is possible to achieve a sufficiently stable and secure locking, and it does not require any ingenuity to assemble, and it is placed in the storage hole attached to the lock unit body so that it faces the lower surface of the hook unit. Is enough, It may form the attached structure as simple.
Further, since the pressing coil spring of the urging means is housed in a storage hole attached to the lock portion main body and is not exposed to the outside, there is no inconvenience such as damage caused by an erroneous operation when the lid is opened.
4) Since the key member 15 that locks the lid is also moved up and down within the range of the long hole 17 with respect to the bolt 16 serving as a rotation fulcrum (rotation center) in the one described in Patent Document 2, When the lid is locked and unlocked, there is a displacement caused by the position movement that may break the weight balance between the bolt serving as the center of rotation and the center of gravity of the key member 15. However, according to the present invention, the various problems can be solved based on the above configuration.
5) Therefore, in the present invention, it becomes a necessary and sufficient and reasonable without making the rotational displacement in the inner and outer directions of the receiving frame of the lock member for locking the lid unnecessarily large. In order to eliminate the various disadvantages of the prior art and make it possible to reasonably and stably perform the vertical movement of the lock member along the guide portion and the rotation of the receiving frame in the inner and outer directions. Therefore, it is possible to always perform a reasonable and stable operation of locking and unlocking the lid.

  In the invention which concerns on Claim 2, as a storage part which accommodates the press coil spring which provides the urging | biasing force for making a locking of a cover body with respect to a hook part, the through-hole attached to the attachment frame side surface exterior of a lock part main body is provided. Since it is used, the earth and sand that has entered along with rainwater can be dropped downward to prevent accumulation around the spring and to prevent deterioration of the urging force, which is more preferable.

  In the invention according to claim 3, the long lock portion main body that is responsible for vertical movement along the guide portion is manufactured by a stainless steel casting that is cast by a lost wax manufacturing method that is a typical precision casting method. As the short hook that is used to rotate the receiving frame in and out, the one made of high-strength spheroidal graphite cast iron is used. Operation can be achieved.

  In the invention according to claim 4, as a hook part pivotally supported by a pin at the upper end part of the lock part main body so as to be rotatable inward and outward of the receiving frame, a pair of right and left two parts connected in parallel by a connecting rod Since it is used, it is possible to rotate the hook portion for locking the lid similar to the other ones, or to perform the operation more stably.

The longitudinal cross-sectional view of the manhole iron lid which gave the locking device of the cover for underground structures which concerns on an example of implementation of this invention. The assembly perspective view to the receiving frame inner peripheral surface side of the locking member in a locking apparatus same as the above. The disassembled perspective view in the receiving frame inner peripheral surface side of the locking member in a locking apparatus same as the above. The assembly top view in the receiving frame inner peripheral surface side of the locking member in a locking apparatus same as the above. The longitudinal cross-sectional view of a locking apparatus same as the above when locking a cover body with the operation | movement which drops a cover body in the opening part from the upper direction of a receiving frame, and closes an opening part. The longitudinal cross-sectional view of the same locking apparatus just before locking of the cover body of the state which the peripheral part lower surface of the cover body and the head of the lock member contacted with the same fall of a cover body. The longitudinal cross-sectional view of the same locking apparatus of the state which engaged the lock member when the cover body was received and supported by the taper surface of the inner peripheral surface of the receiving frame, and the cover body was locked. When the lock member is lifted along the guide portion together with the lid, and the lid is lifted up above the receiving frame, the state immediately before the lid is unlocked and the lid is unlocked is shown. The longitudinal cross-sectional view of a locking apparatus same as the above. Explanatory drawing of the same locking apparatus which shows the 1st step stroke of the raise range which a lock member raises along a guide part in order to cancel | release locking of a cover body. Explanatory drawing of a locking apparatus same as the above which shows the 2nd step stroke of the raise range of a locking member same as the above. Explanatory drawing of the locking apparatus same as the above which shows the range which the hook part of a locking member is pushed by the peripheral part lower surface of a cover body at the time of locking of a cover body, and retracts and rotates to the inner side of a receiving frame. Explanatory drawing of the same locking apparatus which shows the range which the hook part of a lock member pushes with an urging | biasing force at the time of locking of the same upper cover body, and advances and rotates to the outward side of a receiving frame. The disassembled perspective view of the lock member in the same locking device which shows an example of the form of the hook part which concerns on the other Example of this invention.

  An example of the implementation of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a longitudinal sectional view of a manhole iron lid provided with a locking device for an underground structure lid according to an embodiment of the present invention, and FIG. 2 shows locking of the lid which is a main part of the locking device for the lid. FIG. 3 is an exploded perspective view of the locking member toward the inner peripheral surface of the receiving frame, and FIG. 4 is an assembly plan view of the locking member toward the inner peripheral surface of the receiving frame. It is.

In the figure, reference numeral 31 denotes a lid of a manhole iron lid, and 32 denotes a receiving frame whose upper opening is closed by the lid 31. The lid locking device according to an embodiment of the present invention is a lid 31 of the manhole iron lid. And the receiving frame 32.
The lid 31 has a disc shape, and is connected to the upper opening of the cylindrical receiving frame 32 through a hinge 33 provided at one end so as to be openable and closable, and the other side opposite to the hinge. An opening / closing burl hole 34 in which a lower portion of the hole is closed like a bag hole is provided at the side end. Reference numeral 35 denotes a hooking piece for hooking the tip hook portion 36 a of the opening / closing tool 36 provided in the middle portion of the burl hole 34.

  A lock member 37 provided between the lid body 31 and the receiving frame 32 to lock the lid body 31 is assembled and disposed on the inner peripheral surface side of the receiving frame 32.

The lock member 37 is divided into a short hook portion 38 positioned at the upper portion and a long lock portion main body 39 disposed at the lower portion thereof.
The lock portion main body 39 includes a rectangular mounting frame 40 having a space portion 40a inside, and a rectangular plate-like slide portion 41 provided in parallel to the outside of the side surface.
The rectangular plate-like slide portion 41 has an L-shaped tip that projects from the inner peripheral surface of the receiving frame 32 toward the inner center, and is movable in the vertical direction along the longitudinal guide portion 42. Arranged. Specifically, guide surfaces 41 a and 41 a ′ provided on the slide portion 41 of the lock portion main body 39 are an L-shaped bent portion inner surface 43 at the tip of the guide portion 42 and a guide surface 44 provided on the inner peripheral surface of the receiving frame 32. A fine gap is provided between the two and the slidable movement in the vertical direction. Therefore, the lock portion main body 39 can move in the vertical direction along the guide portion 42 via the slide portion 41.
That is, the guide surfaces of the lock portion main body 39 are 41 a and 41 a ′ provided on the slide portion 41, and the guide surfaces of the receiving frame 32 are the L-shaped bent portion inner surface 43 and the guide surface 44 that face each other.
In the illustrated example, a pair of slide portions 41 are provided in parallel with the outer surfaces on both sides of the mounting frame 40 of the lock portion main body 39, and the guide portion 42 and the guide surface 44 on the inner peripheral surface side of the receiving frame 32 facing the guide portion 42 are also provided. Each pair is provided so as to sandwich them.

A short hook portion 38 is pivotally supported by an upper end portion of a long lock portion main body 39 that moves up and down along the guide portion 42 so as to be rotatable inward and outward of the receiving frame 32 via a joining pin 45. ing. Specifically, as shown in FIGS. 2 and 3, the hook portion 38 is connected to the upper end portion of the lock portion main body 39 between the outside of the side surface of the mounting frame 40 and the slide portion 41, as shown in FIGS. 38. A circular mounting base end 38a on the lower surface is inserted, and a hook pin 38 is pivotally supported by inserting a joining pin 45 through an insertion hole formed in the slide portion 41, the circular mounting base end 38a and the mounting frame 40. It is made.
In fact, as shown in the figure, a total of a pair of hook portions 38 is provided between the outer side surfaces of the rectangular mounting frame 40 and the pair of slide portions 41, 41 as shown in the drawing.

  The circular attachment base end portion 38a through which the shaft support connecting pin 45 is inserted is provided on the front side of the lower surface of the hook portion 38 (closer to the outer side of the receiving frame 32), and the rear side of the lower surface of the hook portion 38 (receiving frame 32). The side of the inner side is a notch step 38b. Below the rear-side cut step portion 38 b on the lower surface of the hook portion 38, the hook portion 38 is rotated forward to the outer side of the receiving frame 32, and its tip collar is formed on the inner side below the peripheral edge portion of the lid 31. A pressing coil spring 47 is provided as an urging means for locking the lid 31 by being engaged with the locking portion 46. The pressing coil spring 47 is housed in a housing portion 48 which is a vertical through hole type attached to the outside of the side surface of the mounting frame 40 of the lock portion body, that is, a housing hole penetrating in the vertical direction.

On the inner peripheral surface side of the receiving frame 32, a link mechanism 49 is provided for restricting the ascending range of the lock member 37 that moves up and down along the guide portion 42. The link mechanism 49 is formed by attaching a mounting shaft portion 51 and a restricting tip shaft portion 52 to both ends of the link rod 50 in an H shape, and the mounting shaft portion 51 is supported on the inner peripheral surface side of the receiving frame 32. It is pivotally mounted in mounting holes 53, 53 provided through members. The link mechanism 49 is provided with an inclined support surface 54 via a support member in the lower part thereof so that the tip part is inclined slightly downward, and is attached within the range of the attachment hole 53. A predetermined range of angular rotation is possible in the vertical direction from the inclined support surface 54 about the shaft portion 51. The restricting distal end shaft portion 52 of the link mechanism 49 is inserted and fitted into the space portion 40 a in the rectangular mounting frame 40 of the lock portion main body 39.
The link mechanism 49, which is attached to the inner peripheral surface side of the receiving frame 32 by pivoting one end, inserts a retaining pin 56 into an insertion hole 55 attached to the support member and tightens it with a nut 57. By disposing the retaining pin 56 on the side surface of the link mechanism 49, it is prevented from falling off the receiving frame 32.

The lid 31 is locked and unlocked by moving the lock member 37 in the vertical direction along the guide portion 42 arranged on the inner peripheral surface side of the receiving frame 32 and the upper portion of the receiving frame 32 of the lid 31. Rotation (tilting) of the receiving frame 32 in the inner and outer directions of the receiving frame 32 accompanying the operation of closing the opening and the urging operation of the pressing coil spring 47 as the urging means, and the receiving frame of the lid 31 lifted above the receiving frame 32 is performed by a horizontal pull-out operation toward the outside.
When the opening of the receiving frame 32 is closed with the lid 31, the locking operation of the lid 31 is performed by a locking provided on the inner side of the lock member 37 at the front end of the hook portion 38 and below the peripheral edge of the lid 31. This is done by engaging the portion 46 with the biasing means. When unlocking the lid 31, the lid 31 is lifted to a predetermined position above the receiving frame 32 by using an opening / closing tool 36 (bar), the lid 31 is pulled out to the outside of the receiving frame 32 in the horizontal direction, This is done by disengaging the engaging portion 46 on the lower inner side of the periphery of the body 31 and the hook portion 38 of the lock member 37.
Restriction of the rising range up to a predetermined position of the vertical movement along the guide portion 42 of the lock member 37 necessary for releasing the locking of the lid 31 is performed by the restriction distal end shaft portion 52 of the link mechanism 49 and the lock portion main body 39. This is performed by contacting the bottom surface inner surface 40b of the rectangular mounting frame 40 and turning the link mechanism 49 upward by a predetermined range of angles.

  The locking member 37 required for locking and unlocking the lid 31 is moved in the vertical direction along the guide portion 42 and rotated (inclined) in the inner and outer directions of the receiving frame 32 on the former guide portion 42. The up-and-down movement is performed exclusively by the long lock portion main body 39 (consisting of the rectangular mounting frame 40 and the slide portion 41) of the lock member 37, and the latter receiving frame 32 is rotated inward and outward ( The tilting portion is exclusively handled by a short hook portion 38 pivotally supported on the upper end portion of the lock portion main body 39 of the lock member 37.

The operation of locking and unlocking the lid 31 will be described in detail with reference to FIGS.
FIG. 5 shows a state in which an operation for closing the open lid body 31 and locking the lid body 31 is started. In order to lock the lid 31, as shown in the drawing, the lid 31 is lowered into the receiving frame 32 downward in the direction of the arrow using an opening / closing tool 36 (bar), and the upper opening is closed. I do.
At this time, the lock member 37 comes into contact with the flange-shaped bottom surface portion 32 a projecting below the peripheral edge portion of the receiving frame 32, with the bottom surface portion outer surface 40 c of the rectangular mounting frame 40 of the lock portion main body 39 contacting the lower side portion of the guide portion 42. (Figs. 5 to 7).
When the lid 31 is further lowered into the upper opening of the receiving frame 32, the lower surface of the peripheral edge of the lid 31 abuts against the inclined surface of the head of the hook portion 38 of the lock member 37, and the hook portion 38 is located inside the receiving frame 32. The hook portion 38 retreats and pivots against the elastic force of the pressing coil spring 47 toward the inner side of the receiving frame 32 around the shaft-supporting connecting pin 45, and the inner side below the peripheral portion of the lid 31. The portion enters between the hook portion 38 and the inner peripheral surface of the receiving frame 32, and the engaging portion 46 and the hook portion 38 can be engaged with each other (FIG. 6). At this time, the lock portion main body 39 (the square mounting frame 40 and the slide portion 41) of the lock member 37 is in a state where it does not participate in the rotation and is in contact with the guide portion 42 so as to be vertically movable.
When the cover body 31 is completely received and supported by the inner peripheral surface of the upper opening portion of the receiving frame 32 by taper fitting, the hook portion 38 is urged by the elastic force of the pressing coil spring 47 and the joint pin 45 for the shaft support is centered. The forward end of the receiving frame 32 is rotated forward, and the leading end hook portion enters the engaging portion 46 on the inner side of the peripheral portion of the lid 31 so that the engagement is possible (FIG. 7).

When releasing the locked state of the lid 31, the lid 31 is lifted from the state of FIG. 7 toward the upper outside of the receiving frame 32 by using an opening / closing tool 36 (bar).
Since the lid 31 and the lock member 37 are coupled to each other by the engagement between the tip flange of the hook portion 38 of the lock member 37 and the hook-shaped locking portion 46 on the lower side of the peripheral edge of the lid 31, As the lid 31 is lifted upward, the lock member 37 also follows the lid 31 and rises along the guide portion 42. The lid 31 is lifted above the receiving frame 32 and can be pulled out in the horizontal direction. When the state is reached, the ascent of the lock member 37 along the guide portion 42 stops (FIG. 8). When the lid body 31 is horizontally moved to the outside of the receiving frame 32 along the direction of the arrow and pulled out, the hook portion 38 and the locking portion 46 are disengaged and the locking of the lid body 31 is released.
When the coupling with the lid body 31 is released, the lock member 37 descends along the guide portion 42 by its own weight, and the bottom surface outer surface 40c of the rectangular mounting frame 40 in the lock portion main body is a flange below the peripheral edge portion of the receiving frame 32. The descent along the guide part 42 of the lock member 37 stops by contacting the bottom surface part 32a. Since the bottom surface inner surface 40b of the rectangular mounting frame 40 is separated from the contact with the regulating tip shaft portion 52 of the link mechanism 49 due to the lowering of the lock member 37, the link mechanism 49 is inclined with respect to the mounting shaft portion 51 as a center. It rotates downward until it is supported by 54 and returns to its original position.

How the restriction of the range of vertical movement of the lock member 37 along the guide portion 42 for releasing the locking of the lid body 31 will be described based on FIGS. 9 and 10.
In FIG. 9, the upper opening of the receiving frame 32 is closed by the lid 31, and the lid 31 and the lock member 37 are engaged with the engaging portion 46 and the hook portion 38 on the inner peripheral surface side of the receiving frame 32. It shows the locked state. At this time, the locking member 37 is lowered along the guide portion 42 until the bottom surface portion outer surface 40c of the rectangular mounting frame 40 comes into contact with the flange-shaped bottom surface portion 32a below the peripheral edge portion of the receiving frame 32 and stops. When the descent of the lock member 37 along the guide portion 42 stops, the point A is the lower limit of the range of the downward movement.
At this time, the link mechanism 49 leaves the abutting engagement with the rectangular mounting frame 40 and rotates downward by a predetermined range with its own weight around the mounting shaft portion 51, along the inclined support surface 54. It is arranged in an inclined state with the regulating distal end shaft portion 52 facing down and has returned to its original position.

  When releasing the locked state in which the lid 31 and the lock member 37 in FIG. 9 are coupled together, the lid 31 is pulled up to a predetermined position above the receiving frame 32. Then, the lock member 37 follows the lifting of the lid 31, and the bottom surface inner surface 40 b of the lock-shaped mounting frame 40 of the lock member abuts on the regulating distal end shaft portion 52 of the link mechanism 49 extending from the inner peripheral surface of the receiving frame 32. The restriction tip shaft portion 52 is pushed by this contact and this contact, and the link mechanism 49 pivots upward by a predetermined range about the mounting shaft portion 51 to become a horizontal state and hits the stopper wall 58 to rotate. Ascends and moves along the guide portion 42 by the sum of the range up to the stop. When the upward movement along the guide portion 42 of the lock member 37 is stopped, the point B is the upper limit of the range of the upward movement (FIG. 10). At this time, the lid 31 is lifted up to the upper side of the receiving frame 32 that can be sufficiently pulled out horizontally toward the outside of the receiving frame 32, so that the lid 31 is pulled out outward in the horizontal direction. Thus, the locked state can be reliably released.

FIG. 11 and FIG. 12 are explanatory views in which a part of the lock member 37 for bringing the lid 31 into the locked state is shown in a cross section showing a state in which the revolving and forward turning ranges of the hook portion 38 are restricted.
The hook portion 38 in the lock member 37 is a connecting pin between the upper end portions of the mounting frame 40 and the slide portion 41 via a circular mounting base end portion 38a located on the front side of the lower surface (closer to the outside of the receiving frame 32). It is pivotally supported at 45 so that it can turn inward and outward of the receiving frame 32. Thus, the hook portion 38 that is pressed in contact with the lower inner portion of the peripheral edge of the lid 31 in accordance with the operation of closing the lid 31 is resistant to the elastic force of the pressing coil spring 47 around the joining pin 45. 32, the urging spring 47 contracts due to the pressing of the notch step portion 38b behind the shaft support joint pin 45 on the lower surface of the hook portion 38. The corner portion of the cut step portion 38b stops when it comes into contact with part of the peripheral wall of the storage portion 48 of the biasing spring 47 (point C) (FIG. 11). The range of the backward rotation of the hook portion 38 is appropriately set up to a point (C) where the corner portion of the cut step portion 38b on the lower surface of the hook portion 38 contacts a part of the peripheral wall of the storage portion 48 of the biasing spring 47. This is an angle range, which prevents the hook portion 38 from tilting backwards more than necessary.
When the lower inner part of the peripheral edge of the lid 31 enters between the hook part 38 and the inner peripheral surface of the receiving frame 32 and the pressure from the part is released, the hook part 38 is released by the restoring force of the biasing spring 47. The forward end of the receiving frame 32 is rotated forward, and the leading end hook portion can be engaged with the engaging portion 46 of the lid 31. The forward rotation range is within the hook portion 38. A stopper seat 59 provided by connecting a projection 38c provided at a part of a circular mounting base end 38a on the front side of the lower surface to a storage portion 48 of an urging spring 47 provided outside the side surface of the mounting frame 40; Up to the point (D) where the forward rotation of the hook portion 38 stops upon contact (FIG. 12). At this time, the hook portion 38 is supported by the urging spring 47 and the stopper seat 59 on the lower surface so that the hook portion 38 is in an almost upright state. The rotation is suppressed to an appropriate range so as not to bite into the locking portion 46.

  As is apparent from FIG. 12 in which the hook portion 38 stops moving forward and is almost upright, the pivot point of the hook portion 38 (joint pin 45 for shaft support) stands at the center of gravity of the hook portion 38. It is not on the vertical line, but is biased to the right front side (near the peripheral edge of the receiving frame 32) in the drawing. Therefore, the front end collar of the hook portion 38 and the engaging portion 46 below the peripheral edge of the lid 31 The engagement point F (the point of action where the pressure acts on the hook portion 38 side from the locking portion 46 side of the lid 31 when the internal pressure rises) F is at the rotation center point E (the pivotal support pin 45) of the hook portion 38. On the other hand, it is located at an upper position on the right side a little distance from the perpendicular (see also FIG. 10). Therefore, when the lid body 31 is lifted upward due to an increase in internal pressure, the hook portion 38 is disengaged from the lid body 31 by the pressure acting from the locking portion 46 side of the lid body 31 (the receiving frame 32). There is no possibility of retreating to the inner side (see FIGS. 12 and 10). Therefore, even when the lid body 31 is subjected to impact vibration due to the passage of the vehicle and repeatedly moves up and down at high speed when the lid body 31 is lifted by the internal pressure, the hook portion 38 is engaged with the lid body 31. The lid body 31 is tilted rearward and the lid body 31 is not scattered due to the internal pressure.

The hook portion 38 always rotates (tilts) inward and outward of the receiving frame 32 around the joint pin 45 pivotally supported on the upper end portion of the lock portion main body 39. That is, the lid body 31 is taper-fitted to the inner peripheral surface of the receiving frame 32 to close the upper opening, and the lid body 31 and the lock member 37 are engaged on the inner peripheral surface side of the receiving frame 32. Even during locking (FIGS. 7 and 9), the lid body 32 is lifted upward, and the lock member 37 coupled thereto also rises along the guide portion 42 following the lid body 31, and the lid body 31. Even when the lid 31 positioned above the receiving frame 32 is unlocked or when the lid 31 is lifted due to an increase in internal pressure (FIGS. 8 and 10), the locking member 37 rotates in the inner and outer directions of the receiving frame 32 in both cases. The movement center point E is the center position of the joining pin 45 that pivotally supports the hook portion 38 on the upper end portion of the lock portion main body 39 and is responsible for the rotation as a lock member with respect to the rotation center point E. The position of the center of gravity of the hook portion 38 is always constant and does not fluctuate. (No movement of the center of gravity of the hook portion 38 at the time when locking and unlocking).
In addition to the operation function, the entire locking member 37 is not involved in the rotation in order to lock the lid 31, and the long mounting frame 40 is in charge of the vertical movement along the guide portion 42. The short hook portion 38 pivotally supported at the upper end portion thereof is exclusively responsible for the operation of turning the receiving frame 32 in and out. The hook portion 38 is set to be short and small, and its rotational displacement is restricted by a stopper or the like within a necessary and sufficient angle range so as not to be larger than necessary as described above.

  Therefore, the device according to the above embodiment is rational and stable without the waste associated with the configuration and operation of the lock member 37 for locking the lid 31 as compared with the prior art, and is always reasonable and stable. Therefore, the lid 31 can be moved up and down and rotated or tilted. Therefore, the operation of locking and unlocking the lid 31 can always be performed rationally and stably.

FIG. 13 is an exploded perspective view of a lock member in a locking device for a lid for an underground structure according to another embodiment of the present invention.
In this case, a pair of hook portions 38, 38 that are pivotally supported individually by pins 45, 45 at the upper end portions on both sides of the mounting frame 40 are connected in parallel by a connecting rod 60. The other structures are the same as those according to the first embodiment. Therefore, also in this case, the same effect as that according to the first embodiment can be obtained.

The accommodating portion 48 that accommodates the biasing pressing coil spring 47 of the hook portion 38 may be a through hole penetrating in the vertical direction.
The structure of the storage portion 48 of the biasing spring attached to the outside of the side surface of the mounting frame 40 may be a storage hole that does not penetrate in the vertical direction, and even in this case, the biasing spring is not exposed to the outside. Therefore, it is preferable because the spring can be prevented from being damaged by an erroneous operation when the lid is opened. However, if it is a hole that penetrates the storage hole in the vertical direction, earth and sand that has entered with rainwater can be dropped downward to prevent the spring from accumulating around the spring and prevent the biasing force from deteriorating. It is.

  As the long lock portion main body 39 (the mounting frame 40 and the slide portion 41 and the like) in the lock member 37, a stainless steel cast made by a lost wax manufacturing method which is a typical precision casting method is used. As the short hook portion 38, a hook made of high-strength spheroidal graphite cast iron may be used. In this case, due to the peculiarities of these materials, the influence of variation in the dimensional accuracy of the member related to the sliding of the lock member 37 in the vertical direction between the inner peripheral surface of the receiving frame 32 and the guide portion 42 is further reduced. The lock member 37 can be moved more stably up and down along the portion 42.

31 Lid 32 Receiving frame 32a Flange bottom surface below receiving frame peripheral portion 33 Hinge 34 Opening / closing bar hole 35 Latching piece 36 Opening / closing tool (bar)
36a Tip of hook of opening / closing tool (bar) 37 Locking member 38 Hook 38a Circular mounting base end 38b Incision step 38c Projection 39 Lock unit main body 40 Rectangular mounting frame 40a Space inside the mounting frame 40b Mounting frame Bottom surface inner surface 40c Bottom surface portion of mounting frame 41 Slide portion 41a Guide surface 41a 'Guide surface 42 Guide portion 43 L-shaped bent portion inner surface 44 Guide surface 45 Joint pin for pivot support 46 Locking on the inner side below the periphery of the lid Part 47 Energizing pressing coil spring 48 Storage part 49 Link mechanism 50 Link bar 51 Mounting shaft part 52 Restricting tip shaft part 53 Mounting hole 54 Inclined support surface 55 Insertion hole 56 Retaining pin 57 Tightening nut 58 Stopper wall 59 Stopper Seat 60 Connecting rod A Lower limit range of the vertical movement of the lock member 37 along the guide portion 42 (Contact between the bottom surface of the lock member 37 and the bottom surface of the inner peripheral surface of the receiving frame 32)
B Upper limit range of the vertical movement of the lock member 37 along the guide portion 42 C Limit range of the backward movement of the hook portion 38 in the leftward direction (contact between the lower cut-in step portion 38b of the hook portion 38 and a part of the peripheral wall of the storage portion 48)
D Limit range of rightward forward rotation of the hook portion 38 (contact between the protrusion 38c formed on the circular mounting base end 38a of the hook portion 38 and the stopper seat 59)
E Center point of rotation of hook portion 38 inward and outward of receiving frame 32 (joint pin 45 for shaft support)
F Fitting point between the hook portion 38 and the locking portion 46 at the periphery of the lid body when the lid is locked (pressure acting point from the locking portion 46 side of the lid body to the hook portion 38 side when the lid body floats due to internal pressure)

Claims (4)

It is connected to the upper opening of the receiving frame via a hinge provided at one side end so that it can be opened and closed and pivoted, and the lower part of the hole opposite the hinge is closed in the form of a bag hole. A locking device for locking the lid body between the lid body provided with the opening and closing bar hole and the receiving frame whose upper opening is closed by the lid body, and for locking the lid body Movement of the lock member in the vertical direction along the guide portion disposed on the inner peripheral surface side of the receiving frame, rotation of the lock member in the inner and outer directions, and engagement between the lock member and the inner periphery of the lid body. An urging force by a spring that brings the lid into a locked state through engagement with the stopper, and a lock member that is coupled to the lock member and lifted to the upper side of the receiving frame to pull the lid outward from the receiving frame; Locking the lid through engagement and disengagement with the locking portion inside the lid periphery The lock device of underground structures lid unit which performs a lock,
The locking member that locks the lid body is required to be pivotally displaced in and out of the receiving frame in a direction that is necessary, sufficient, and rational, and can be moved up and down along the guide portion of the locking member and inward and outward of the receiving frame. In order to be able to perform the rotation of the machine reasonably and stably,
The lock member is divided into a hook part that is short and responsible for turning the receiving frame in and out, and a lock part that is long and responsible for vertical movement along the guide part.
The sliding part of the long lock part main body formed by a mounting frame having an internal space part and a sliding part attached to the outside of the side face of the receiving frame inner peripheral surface and a guide part whose tip is bent in an L shape There is an arrangement structure that is movable in the vertical direction along the guide portion of the lock member by being slidably held between them,
A long hook portion that moves up and down along this guide portion is pivotally supported by a pin so that the short hook portion can be pivoted inward and outward of the receiving frame by a pin. With a pivotable arrangement structure,
Engage the hook part with the locking part on the inner side of the lid body against the lower surface of the short hook part by the pressing coil spring housed in the storage part attached to the outside of the side of the mounting frame in the long lock part body Through which a biasing force is applied to bring the lid into a locked state,
And, in order to release the locking of the lid body through the engagement and disengagement between the hook portion and the locking portion inside the lid peripheral portion in accordance with the drawing of the lid body above the receiving frame to the outside of the receiving frame. In the inner space of the mounting frame in the lock body, the other end of the link mechanism is pivotally attached to the inner peripheral surface of the receiving frame so that it can be pivoted in the vertical direction within an appropriate angle range. An apparatus for locking a lid for an underground structure, characterized in that an ascending range of vertical movement along a guide portion of a lock member is regulated by inserting and fitting a shaft portion.   Intrudes with rainwater as a storage part attached to the outside of the side of the mounting frame in the main body of the long lock part that houses the pressing coil spring that applies the urging force that locks the lid to the short hook part of the lock member 2. The underground structure according to claim 1, wherein a through-hole penetrating in the vertical direction is formed in order to prevent sedimentation around the spring and prevent deterioration of the urging force by dropping the earth and sand in the downward direction. Lid lock device.   The influence of variation in the dimensional accuracy of the member related to the sliding of the lock member in the vertical direction between the inner periphery of the receiving frame and the guide portion is further reduced, enabling more stable vertical movement of the lock member along the guide portion. Therefore, the long lock part main body of the lock member is manufactured by a stainless steel cast by the lost wax manufacturing method which is a typical precision casting method, and the short hook part is manufactured by high-strength spheroidal graphite cast iron. The device for locking a lid for an underground structure according to claim 1 or 2, wherein the device is a lid.   As a short hook part that is pivotally supported in the upper and lower ends of the long lock part main body via a pin so as to be pivotable inward and outward of the receiving frame, two hook parts are connected side by side with a connecting rod. The device for locking a lid for an underground structure according to claim 1, 2 or 3, wherein a thing is used.