JPH0412114Y2 - - Google Patents

Description

[Detailed explanation of the idea] [Industrial application field]

The present invention relates to a locking device for a manhole cover on a road surface.

[Conventional technology]

Manholes that open onto the road surface are closed by embedding an edge frame so as not to protrude above the road surface, and fitting a cover body onto the edge frame.

[Problem that the invention attempts to solve]

The problem here is that when a vehicle passes over the manhole, the manhole cover may not only jump and cause a traffic accident, but also the manhole cover may rattle and generate noise. Furthermore, since even people other than the limited number of workers can easily open the lid and enter the manhole, there is a risk that the manhole could be used for crime. The present invention was made based on the above circumstances, and when the lid is closed against the rim, the lid is locked to the rim so that the lid does not come off accidentally.
To provide a locking device for a manhole cover which does not rattle and cannot be opened without a specific operating tool.

[Means to solve the problem]

For this purpose, the present invention is a device for closing the manhole by fitting a lid over the edge frame of the manhole, in which the edge frame is provided with an engaging groove recessed laterally, and an engaging pawl that engages in the engaging groove by a dynamic operation is provided on the inside of the lid;
The lid is provided with a hole into which an operating tool for rotating the engaging claw is inserted, and the lid is provided with a locking means that is engaged and disengaged by rotation of the operating tool. That is.

【Example】

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the figure, reference numeral 1 denotes the edge frame of a rectangular manhole, into which two manhole cover bodies 2 are fitted, with their back edges 2a joined together. The manhole cover body 2 has a front edge 2b and a side edge 2c, respectively.
The supporting stepped portion 1a formed on the edge frame 1 of the manhole is
Block the manhole while it is placed on top. In the edge frame 1, located above the support step portion 1a,
The lid body 2 is provided with an engagement groove 3 recessed laterally opposite to the side edge 2c of the lid body 2, and the lid body 2 can be freely engaged and disengaged from the engagement groove 3 by a turning operation. An engaging claw 4 that engages is provided. The engagement claw 4 has a boss portion 4a rotatably supported on a pivot member 6 fixed to the back side of the lid body 2 with a bolt 5, and a center portion of the boss portion 4a has a A square hole 7 is formed to receive an operating tool (not shown). A hole 8 into which an operating tool is inserted is bored in the lid 2 coaxially with the square hole 7. In addition, the above-mentioned engaging claw 4
is provided with a clearance C that allows it to move slightly in the vertical direction between the back surface of the lid body 2 and the pivot member 6, and in order to enable this movement, the boss portion 4a is
is adapted to be able to slide in the axial direction with respect to the pivot member 6. Further, a lock pin 9 with a head 9a projecting upward is screwed onto the engagement claw 4.
The notch slot 10 that receives the head 9a is located on the lid body at a position where the engaging claw 4 is engaged with the engaging groove 3.
It is formed on the back side of the . In such a configuration, when the lid 2 is fitted onto the edge frame 1, the engaging claw 4 is retracted inward from the side edge 2c of the lid 2, as shown by the imaginary line in FIG. It rests on the support step 1a. In this state, insert an operating tool (for example, a square wrench) into the hole 8, and
When the tip is introduced and turned, the engaging pawl 4 slides on the support step 1a and comes to the position indicated by the dotted line in FIG. 4. At this stage, the head 9a of the lock pin 9 enters the notch slot 10, and the lid 2 is lowered by a clearance C and set so that its surface is flush with the upper surface of the edge frame 1. The engagement claw 4 is introduced into the engagement groove 3 in this state. Therefore, when the manhole cover 2 is closed, the cover 2 is locked to the edge frame 1, and will not jump or shake unnecessarily. Further, since the engaging claw 4 cannot be removed from the engaging groove 3 without using an operating tool, the manhole cannot be opened by a third party (other than a specific worker). In this embodiment, when removing the lid 2, the head 9a of the locking pin 9 must be pushed out from the notch slot 10 in a pivoting motion. For this reason,
The notch slot 10 and the head 9a have sloped surfaces. When this protrusion occurs, the lid body 2
, so a considerable amount of force is required when turning the operating tool. Therefore, the locking device may be constructed as shown in FIGS. 6 and 7. In this embodiment, a notch slot 11 is formed in the base portion 4b of the engaging claw 4 above the boss portion 4a of the engaging claw 4, and a lock pin is provided which extends horizontally toward the pivot member 6 side opposite to the notched slot 11. 12, which is supported by a spring 13. This is a configuration known as a so-called click stop mechanism. The notch slot 11 is located at a position where the engaging claw 4 is drawn inward from the side edge 2c of the lid body 2 (imaginary line in FIG. 7) and at a position where the engaging claw 4 enters the engaging groove 3 (the seventh
Two locations are provided corresponding to the dotted lines in the figure. In such a configuration, when the lock pin 12 is inserted into the notch slot 11, the engaging pawl 4
is not rotated, so the state of engagement of the engagement pawl 4 with the engagement groove 3 is maintained stably. Furthermore, since the engaging pawl 4 is engaged and disengaged from the engaging groove 3 only by the resistance of the spring 13, the operating tool can be operated more easily than by lifting the lid body 2 upward as in the above-mentioned embodiment. . Further, in the embodiments shown in FIGS. 8 to 11, a locking piece 14 is provided on the boss portion 4a of the engaging claw 4, and is rotatably fitted on the lower side of the boss portion 4a. 6 Lock piece pivot support member 1 installed below
It is supported by 5. A square hole 16 smaller than the square hole 7 formed in the boss portion 4a is formed in this lock piece 14, so that it can be rotated independently of the engaging pawl 4 using an operating tool. It's summery. Then, the lock piece 14 and the boss portion 4
In the lower part of a, there is a cam engagement groove 1 common to the circumferential surface.
7 and 18 are formed, and an elastic cam piece 19 that engages with these is attached to the pivot member 15. The elastic cam piece 19 is connected to the lock piece 1.
4 and the circumferential surface of the boss portion 4a, and when they correspond to the cam engagement grooves 17 and 18, they are engaged with the cam engagement grooves 17 and 18. The cam engagement groove 18 is engaged with the elastic cam piece 19 at the position where the engagement claw 4 engages with the engagement groove 3 (dotted line in FIG. 11). A stepped portion is locked at the tip of the elastic cam piece 19 so that the claw 4 cannot move in the direction of separation from the engagement groove 3.
Then, by rotating the lock piece 14 independently,
By pushing the elastic cam piece 19 with its circumferential surface, it can be separated from the cam engagement groove 18 (imaginary line in FIG. 9). In such a configuration, if the lock piece 14 is rotated independently with the engagement pawl 4 inserted into the engagement groove 3 to align the cam engagement groove 17 with the cam engagement groove 18, the elastic cam Piece 19 has both engaging grooves 17 and 18
The lock state of the engaging claw 4 can be realized. Furthermore, if only the locking piece 14 is turned independently, the elastic cam piece 19 will come off from the cam engaging groove 18 and the locking state of the engaging pawl 4 will be released. By doing so, the engaging claw 4 can be removed from the engaging groove 3. In this case, two operating tools are required, one for turning the engagement claw 4 and the other for turning the locking piece 14. Therefore, it becomes more difficult for a third party to open and close the lid 2. It should be noted that the locking devices of the above embodiments can be applied not only to rectangular manholes but also to circular manholes.

[Effect of the idea]

As described in detail above, the present invention, when the lid is fitted onto the edge frame, is engaged and locked by the engaging means, so that the engaged state can be reliably maintained.
Even if a vehicle passes over it, the lid will not jump up and cause a traffic accident, and there will be no noise caused by rattling, and the lid can be opened by a third party. This can bring about practical effects such as eliminating the risk of being exposed.

[Brief explanation of the drawing]

Figure 1 is a plan view showing one embodiment of the present invention;
The figure is a vertical front view of the same, Figure 3 is a vertical side view of the same, Figure 4 is a vertical cross-sectional view of the same.
The figure is a plan view of the main part, Fig. 5 is an enlarged vertical sectional side view of the main part, Fig. 6 is an enlarged longitudinal sectional side view of the main part of another embodiment of the present invention, and Fig. 7 is a plan view of the main part. Figure 8 is an enlarged longitudinal sectional side view of the main part of yet another embodiment, Fig. 9 is a bottom view of the same, Fig. 10 is a longitudinal sectional side view of Fig. 9, and Fig. 11 is a plan view of the main part. It is. 1... Edge frame, 1a... Support step, 2... Lid body,
2a...back edge, 2b...front edge, 2c...side edge, 3...engaging groove, 4...engaging claw, 4a...boss, 4b...base, 5...bolt , 6... Pivotal support member, 7... Square hole, 8... Hole, 9... Lock pin, 9a... Head, 10, 11... Notch slot,
12...Lock pin, 13...Spring, 14
... Lock piece, 15 ... Lock piece pivot member, 16
...Square hole, 17, 18...Cam engagement groove, 19...
...Elastic cam piece, C...Clearance.

Claims (1)

[Scope of utility model registration request] In a device for closing the manhole by fitting a lid body onto the edge frame of the manhole, the edge frame is provided with an engagement groove recessed on the side, and the engagement groove can be opened by rotating the edge frame. An engaging pawl that engages with the inside is provided on the inside of the lid body, a hole is provided in the lid body into which an operating tool for rotating the engaging pawl is inserted, and the lid body has a hole for inserting the operating tool. A locking device for a manhole cover, comprising a locking means that is engaged and detached by rotation of the manhole cover.