JPH045102B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a locking structure for a lid for closing a manhole for maintaining and inspecting various pipes and wiring buried underground.

[Prior Art] Conventionally, it has been thought that a manhole cover installed flush with a road surface could be locked to prevent it from being opened by mischief, etc., but such a locking structure has not yet been developed. .

[Object of the Invention] The present invention provides a locking structure on the lower surface of the lid, and the manhole frame is configured without any processing, so that it can be replaced with an already used lid, or If the lid in use develops cracks, the frame buried in the road surface by pouring concrete can be broken and dug up, or a new frame can be poured and buried in concrete after being dug up. This eliminates the need for all construction work, which reduces the economic burden in terms of materials and construction, and also reduces the long period of transportation, including the construction period for removing and renewing the frame and the curing period after turning. The aim is to ensure that restrictions and traffic closures can be completed in an extremely short period of time.

[Structure of the Invention] A pair of support parts are provided vertically at the outer end position of the lower surface of the lid body, and a through hole is bored in each of the support parts above the pair, while the lock member is positioned eccentrically in the longitudinal direction. A pin is formed horizontally through the pin, both ends of the pin are pivotally connected to the through hole, and an edge is provided on the end surface of the unbalanced side of the locking member so as to be parallel to the pin and abut against the wall surface of the frame of the manhole. A plurality of serrated locks are formed, and the lid body is further provided with an unlocking device for pushing the lock member down inside the pivot position of the lock member.

[Function] When attaching the lid body to the manhole frame, the edge-forming end surface of the locking member, which is tilted with the unbalanced side facing downward, comes into contact with the wall surface of the frame, and the lid body is lowered. When the unbalanced side is raised and the lid body is fitted into the frame, it becomes approximately horizontal, and a plurality of edges provided on the end face of the unbalanced side come into contact with the wall surface of the frame to lock the lid body.

Even if a force is applied to lift the lid body in this locked state, the lid body cannot be separated from the frame body because the shape in which the plurality of edges are in contact with the wall surface of the frame body does not collapse.

[Embodiment] In the figure, reference numeral 1 denotes a frame embedded in the opening of a manhole with its upper end surface flush with the same surface, and a step 2 is provided around the inner surface.

Reference numeral 3 designates a lid body whose peripheral edge fits into the stepped portion 2 of the frame body 1 to close the opening of the manhole, and on the bottom surface there are two lids placed at regular intervals on the outer edge position on a line connecting the center lines. A pair of support parts 4, 4 are formed by vertically extending the side walls in parallel, and through holes 5, 5 are bored in each support part 4, 4 in an opposing manner. Furthermore, a bottom wall 6 is installed at the lower end of each of the support parts 4,4.

Reference numeral 7 denotes a locking member formed in the shape of a rectangular parallelepiped with a square cross section, which is eccentrically positioned in the longitudinal direction and passes through the pin 8 horizontally, and both ends of the pin 8 are inserted into the through hole 5,
5 and pivotally attached to the support parts 4, 4, and the unbalanced side 7
The lower surface of the pin 8 is abutted against the tip of the bottom wall 6.
The lower limit of the downward slope is regulated using the fulcrum.

A pin 8 is provided on the end surface of the unbalanced side 7a of the lock member 7.
Edges 9a to 9e are formed in a sawtooth shape on the side in parallel to the . As shown in FIG. 7, these edges 9a to 9e are provided so that the central edge 9c is the most protruding and the ridgeline draws an arc when viewed from the side.

Furthermore, a recessed hole 10 is provided in the lid main body 3, located inside the support parts 4, 4, and inside the pin 8, and a screw hole 11 is passed through the center of the recessed hole 10, and an opening is opened in the screw hole 11. The lock key 12 is inserted through it, and the spring washer 13 is always inserted as shown in FIG.
A locking cap 14 is screwed into the screw hole 11 through the screw hole 11, and a rubber cap 15 is fitted into the recessed hole 10 to hide the locking cap 14. The head 14a of the locking cap 14 has a special planar shape as shown in FIG. 6, so that even if an attempt is made to remove it by mischief, it cannot be removed with ordinary tools.

Further, the lid main body 3 is provided with a retractable handle 16 at an end that is at an angle of 90 degrees with respect to the supporting parts 4, 4, and by holding the handle 16, the lid body 3 can be easily moved.

Then, as shown in FIG. 8, push the unlock key 12 into the screw hole 11, push down the rear part of the lock member 7, and hold the lid body 3 with the unbalanced side 7a facing upward.
When the locking member 7 is placed over the frame 1 buried in the manhole opening and fitted into the stepped portion 2, and the unlocking key 12 is removed, the unbalanced side 7a of the locking member 7 is lowered by its own weight, and the edge 9a provided on the end face is lowered. 9e is rubbed against the inner wall surface of the frame 1, and the edges 9c and 9d are rubbed against the inner wall surface of the frame 1 as shown in FIG.
The locking member 7 is brought into a locked state by being in contact with the inner wall surface of the locking member 7 in a substantially horizontal position.

In this locked state, even if you try to lift the lid main body 3 by holding the handle 16, the upper edge of the edge 9a to 9e provided in the circular arc shape on the side surface than the one in contact with the frame 1 in FIG. Since 9b or 9a sequentially abut against the frame 1, the lock by the locking member 7 is not released, and therefore the lid body 3
cannot be removed.

On the other hand, when it is necessary to remove the lid body 3, remove the rubber cap 15 and locking cap 14,
When the unlocking key 12 is inserted into the screw hole 11 and pressed down to tilt the rear side of the locking member 7 downward from the pivot point as shown in FIG. 8, the edges 9a to 9e are brought into contact with the frame 1. is released, the lock becomes free, and the lid body 3
can be lifted and removed from the frame 1.

[Effects of the Invention] As described above, in the manhole cover locking structure of the present invention, the edge of the end surface of the locking member pivotally attached to the support part hanging from the lower surface of the cover body comes into contact with the manhole frame, The locking member becomes approximately horizontal and locks the lid body, and even if force is applied to lift the lid body in order to remove it, the locking member continues to remain in a horizontal state, and if an attempt is made to open the lid body by mischief etc. will not succeed in the act.

On the other hand, when the lid body is to be removed as necessary, the locked state by the locking member can be easily released by operating the unlocking device, and the lid body can be easily removed.

In addition, since the locking structure of the present invention is provided only on the lid body, it is possible to replace the lid in use with one equipped with this locking structure, or when replacing a damaged lid. There is no need to change the body, the replacement work can be completed in an extremely short time, traffic restrictions and interruptions can be kept to a minimum, and it is extremely economical in terms of materials and construction. It is something that

[Brief explanation of drawings]

The figures relate to an embodiment of the present invention, and Fig. 1 is a plan view of the lid body, Fig. 2 is a rear view of the same, Fig. 3 is a sectional view of the same, Fig. 4 is a sectional view of the main part, and Fig. 5 is a 6 is a plan view of the unlocking device, FIG. 7 is a sectional view in the locked state, and FIG. 8 is a sectional view in the unlocked state. DESCRIPTION OF SYMBOLS 1... Frame body, 3... Lid main body, 4, 4... Support part, 5, 5... Through hole, 7... Lock member, 8...
Pin, 9a-9e...Etsuji.

Claims (1)

[Claims] 1 A pair of support parts are provided vertically at the outer end position of the lower surface of the lid body, and through holes are bored in each support part in a manner that they face each other, while a lock member is placed eccentrically in the longitudinal direction and pinned horizontally. The two ends of the pin are pivotally connected to the through holes, and the end face of the locking member on the unbalanced side is parallel to the pin and has a serrated edge that abuts the wall surface of the manhole frame. 1. A locking structure for a manhole cover, characterized in that a plurality of manhole covers are formed, and the cover body is further provided with an unlocking device for pushing the lock member down inside the pivot position of the lock member.