JPH0521551Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a device for closing sewer manholes and inspection ports.

(Conventional technology) Conventionally, sewer manholes, inspection openings, etc.
As shown in the figure, a lid d with a rectangular annular packing c glued to the back is placed on a widening step b formed at the upper opening edge of a rectangular cylindrical frame a to close it off. .

An L-shaped engagement piece e is vertically disposed slightly inside one side edge of the back surface of the lid d, and a horizontal piece e' at the lower end of this engagement piece e is formed in a recess formed in the upper inner side of the frame body a. The center part of the inverted V-shaped engaging pawl h is pivoted to the hanging piece g that engages with f and hangs down slightly from the inside of the other side edge.
However, the tip of this engaging claw h is pushed against the frame body a by its own weight.
The lid d is locked by being engaged with the lower side of an inward protrusion a' protruding from the inner wall of the lid.

A cross-shaped elongated hole i facing the direction of the engagement claw h is bored in the lid d at a location facing the base end of the engagement claw h. Insert the engaging hook l at the lower end of the hooking rod k into this elongated hole j, pull up the base end of the engaging claw h, and rotate the engaging claw h counterclockwise in Figure 3 to engage the hook. The lock between the claw h and the protrusion i is released, and the lid d
can be opened.

(Problem that the device aims to solve) In conventional devices such as those described above, the long hole required for the lock release operation is cut into the cover, which has the problem that, for example in sewers, odors from inside the manhole leak onto the ground through this hole.

(Means for Solving the Problems) The present invention attempts to provide a device that can block manholes, etc. without providing holes in the lid, in order to prevent odor from leaking through the lid. be.

The device of the present invention is provided with a hanging wall on the peripheral edge of the back surface, an outward projecting piece is provided on one side of the outer circumferential surface of the hanging wall, and a fitting recessed inwardly on the outer circumferential surface of the other side. On one side of the inner peripheral wall of the airtight lid with a matching groove and the opening and expansion step formed at the upper end,
A receiving frame including a recess into which the projecting piece can be locked, and an engaging pawl whose tip can be releasably engaged with the engaging groove by rotating on the other side of the inner circumferential wall. It is characterized by having the following.

(Example) Hereinafter, an example of the present invention will be described in detail based on FIGS. 1 and 2.

Reference numeral 1 denotes an airtight lid, which includes a rectangular plate-like top plate 1a having a recessed portion 2 serving as a handle on one side of the top surface, and this top plate 1a.
It consists of a hanging wall 1b that hangs down along the peripheral edge of the back surface of the hanging wall 1b, and an upward gutter-shaped packing 3 is fitted and bonded to the lower end of the hanging wall 1b.

A horizontal projecting piece 4 facing outward is provided on the left end surface 1c of the outer peripheral surface of the hanging wall 1b, and also on the right end surface 1d.
is provided with an engaging groove 5 which is shallower than the wall thickness of the hanging wall 1b and is symmetrical to the projecting piece 4 and has a triangular front shape and is recessed inward from the outer peripheral surface of the hanging wall 1b.

Reference numeral 6 denotes a receiving frame that is fitted into the opening at the upper end of the manhole, and a rectangular cylindrical frame 6a having an opening 7 at its upper end has an opening and expanding step 6b formed at the upper end.

As clearly shown in FIG. 2, a recess 8 is provided in the left peripheral wall 6c of the opening/expansion step 6b facing the protruding piece 4 of the lid 1. As shown in FIG.

In addition, left and right peripheral walls 6 facing the engagement groove 5 of the lid 1 are provided.
A recessed portion 9 facing right is formed in d, and a center portion of an inverted V-shaped engaging pawl 11 is pivotally attached to a longitudinal shaft 10 provided in this recessed portion 9.

Due to its own weight, the inner claw piece 11a of the engaging claw 11 is constantly pushed from the inner opening of the recessed part 9.
It begins to protrude inward.

The projecting piece 4 is attached to the recess 8 in the opening and expanding step 6b of the receiving frame 6.
When inserting and closing the lid 1, the claw piece 11a
Once it enters the recessed part 9 and allows the lid 1 to pass through,
After the lid 1 is closed, the claw piece 11a engages with the fitting groove 5, making it impossible to open the lid.

To open the lid 1, as shown in FIG.
is inserted through the gap 13 between the receiving frame 6 and the lid 1, and the engaging claw 11 is rotated counterclockwise in FIG. 2 to disengage the engaging groove 5 and the engaging claw 11a, and then the handle All you have to do is put your hand on 2 and pull it up.

(Modification) In the embodiment described above, the engaging claw is pivotally attached to the receiving frame,
Although the claw piece at the tip thereof is made to protrude upward due to its own weight, instead of this, a torsion spring or the like may be provided to force the engaging claw to protrude inward.

Packing of the lower end surface of the hanging wall of the lid may be omitted depending on the location where the manhole is used.

The handle for lifting the lid may be provided not at the center of the top plate but at the periphery.

(Effects of the invention) As described above, according to the invention, the protrusions and engagement grooves provided on the outer circumferential surface of the lid are connected to the recesses and engagement claws provided on the inner circumferential wall of the opening and expansion step portion of the receiving frame. Since the top plate of the lid does not have a hole for unlocking, there is no need to worry about odors from manholes leaking from the lid, and the odor resistance is improved.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view taken along the - line in FIG. 1,
FIG. 3 is a vertical cross-sectional view showing a conventional manhole cover;
FIG. 4 is a plan view showing the elongated hole in the lid of FIG. 3. 1... Lid, 1a... Top plate, 1b... Hanging wall, 2
... recess, 3 ... packing, 4 ... protrusion, 5 ...
...Engagement groove, 6...Receptacle frame, 6a...Frame body, 6b...
Expanding step portion, 6c, 6d...peripheral wall, 7...opening, 8
... recess, 9 ... recess, 10 ... shaft, 11 ...
Engagement claw, 11a...Claw piece, 12...Lock release key, 13...Gap.

Claims (1)

[Scope of utility model registration request] Airtight with a hanging wall on the periphery of the back surface, an outward protruding piece protruding from one side of the outer circumferential surface, and an engaging groove recessed inward on the other outer circumferential surface. A recess in which the protruding piece can be engaged is provided on one side of the inner circumferential wall of the expansion step formed in the opening at the upper end, and a recess on the other side of the inner circumferential wall is provided. A closing device for a manhole or the like, characterized in that the receiving frame has a distal end having an engagement claw that can be detachably engaged with the engagement groove.