JPH0617871Y2 - Underground structure lid - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a lid used for manholes and other underground structures.

(Prior Art) For example, an iron lid for a manhole is provided with a prying hole in its peripheral portion, so that even if there is no lid-opening tool called a hand key, the tip of a pickaxe, an iron rod, etc. can be inserted to pry the lid. Could be opened. One of the reasons for this is that the prying hole was formed in the direction of the center of the lid in the case of the round lid and in the direction of the right angle to the peripheral edge in the case of the square lid. Therefore, if you can insert the tip of a pickaxe, you can easily pry open. Recently, various manhole lids with a locking mechanism have been developed to prevent illegal dumping and illegal entry, but the locking mechanism is expensive.

(Technical problem) The object of the present invention is to solve the above-mentioned problems, and it is very difficult to open the lid with something other than the opening tool such as a pickaxe by devising the direction of the prying hole without using the locking mechanism. To provide a lid for a simple underground structure.

(Technical Means) The purpose is to have the locking ends 13 and 14 projecting to the left and right of the tip, and can be inserted into the prying hole 2 which is inwardly of the lid main body 1 from a predetermined position on the peripheral edge of the lid main body 1. In the lid for an underground structure to be opened by a simple opening tool 11, 12, the prying hole 2 is a normal direction when the peripheral edge portion is arcuate, and a peripheral edge portion when the peripheral edge portion is linear. Part or the whole of which has a deflecting portion 3 which is displaced to the right or left with respect to the orthogonal direction, and the engaging ends 13 and 14 are engaged in the prying hole 2 so that the tool shaft portion is This is achieved by a configuration in which a hanging edge 7 directed in the normal direction or the orthogonal direction is provided at least on the lower surface of the left and right peripheral portions of the prying hole 2.

(Embodiment) Explaining with reference to the illustrated embodiment, the embodiment relates to a circular iron lid, that is, the above-mentioned round lid, and therefore has an arc-shaped peripheral portion 5 and faces the inside of the lid body 1 at a predetermined position thereof. Prying hole 2
Have.

The prying hole 2 illustrated in FIG. 1 has a normal line 1 extending from the inlet 6 to the vicinity of the inside of the hanging edge 7 provided along the peripheral edge on the lower surface of the lid body.
The orthogonal portion 4 along the direction, that is, the portion 4 that is orthogonal to the tangent line and faces inward of the lid body 1, and from the vicinity of the inside of the hanging edge 7 to the left (or right) from the direction of the normal line l. And a deflected portion 3 which is offset. The continuous position of the deflecting portion 3 and the orthogonal portion 4 is not limited to the vicinity of the inner side of the hanging edge 7, but the locking ends 13 and 14 of the lid opening tools 11 and 12 shown in FIG. 3 or 6 can be inserted and after the insertion. The locking ends 13 and 14 are set on the hanging edge 7 so that they can be rotated for locking.

The degree of deviation of the deflection portion 3 from the normal line 1 to the side, that is, the deviation angle α
Can vary depending on the form of the lid main body 1, but specifically, it is an angle at which slip occurs along the inclined hole edge 8 when the tip of a pickaxe or an iron rod is inserted to try to pry. As a result of research, this deviation angle α is preferably between 2 ° and 45 °. If it is smaller than 2 °, it is easy to pry with a pickaxe.
This is because even with 11 and 12, it is difficult to open and close the lid.

In the example of FIG. 4, the whole prying hole 2 is formed only by the deflecting portion 3. The degree of deviation angle α, the size of the prying hole 2 and the locking ends 13, 14 of the lid opening tools 11, 12 are shown. The relationship can be set in the same manner as described above. Further, other configurations are the same as those described above, and the reference numerals are used to omit the description. 10 is lid 1
A frame body for receiving the above, and T indicates a tapered fitting surface.

A lid opening tool suitable for opening the lid having such a prying hole 2 is as shown in FIGS. 3 and 6, for example.

(Operation of the Invention) The lid main body 1 of the present invention having the above-mentioned configuration is a prying hole even when the tip of a pickaxe is inserted when the lid is opened from the closed state supported by the tapered fitting surface T on the frame body 10. Since the deflecting portion 3 of 2 causes inward sliding, it cannot be locked, and therefore the prying action force is deviated, and the lid main body 1 is not plucked up.

On the other hand, the lid opening tools 11 and 12 as illustrated in FIG. 3 or FIG.
The locking ends 13 and 14 can be locked to the inner ends of the prying hole 2 in such a state that the tool shaft portion is oriented in the normal direction or the direction orthogonal to the peripheral edge portion 5 by the hanging edge 7. Therefore, it is possible to stably open the lid without losing the left-right balance.

(Effects of the Invention) Therefore, according to the present invention, even if the tip of a pickaxe or an iron rod is inserted into the prying hole 2 to pry it open, the deflecting portion 3 causes a slip, and the prying force is deflected toward the deflecting portion 3. Since it is not possible to apply a force in the direction in which the lid body 1 is lifted up, it becomes extremely difficult to pry, and as a result, it becomes almost impossible to open the lid. Therefore, even if the locking mechanism is not used, unlike the conventional lid having a prying hole, there is no possibility of prying open easily, and there is an effect that illegal opening can be prevented. Of course, the lid can be stably opened by using the lid opening tools 11 and 12 as illustrated.

[Brief description of drawings]

The drawings relate to a lid for an underground structure according to the present invention.
FIG. 1 is a plan view of the first embodiment, FIG. 2 is a front view thereof, FIG. 3 is a sectional view, FIG. 4 is a plan view of the second embodiment, FIG. 5 is a front view, and FIG. It is a principal part top view of a tool.

Claims (2)

[Scope of utility model registration request] 1. A lid opening tool having locking ends 13 and 14 projecting to the left and right of a tip portion, which can be inserted into a prying hole 2 which is inserted inward of the lid body 1 from a predetermined position on the peripheral edge of the lid body 1. In the lid for an underground structure for opening by 11, 12, the prying hole 2 is in the normal direction when the peripheral edge is arcuate, and in the direction orthogonal to the peripheral edge when the peripheral edge is straight. On the other hand, a part or the whole of which has a deflecting portion 3 which is deviated in either the left or right direction, the locking ends 13 and 14 are locked in the prying hole 2, and the tool shaft portion is moved in the normal direction or A lid for an underground structure, characterized in that it has a hanging edge 7 directed in an orthogonal direction at least on the lower surface of the left and right peripheral portions of the prying hole 2. 2. The utility model registration in which the deflection portion 3 is provided from the inside of the prying hole 2 and is continuous with the orthogonal portion 4 at the entrance of the prying hole 2 in the direction of the normal line or the direction orthogonal to the peripheral portion. The underground structure lid according to claim 1.