JPH068455U - Manhole cover - Google Patents

Abstract

(57) [Summary] [Purpose] In a manhole cover used for a sewage underground waterway, it has a lock structure to prevent the lid body from popping out due to backflow due to an increase in water in the underground waterway. The structure is designed to prevent the inflow of rainwater from the river. [Structure] A through hole 2 having a chamfered portion 3 is formed in a lid body 1,
A long flat head screw 4 is inserted into this, and a rubber packing 5, a washer 6, a hexagon nut 7 and a bladed hexagon nut 8 are sequentially fitted to the protruding portion of the flat head screw 4 to be integrally and rotatably assembled. A configuration in which a projecting piece 11 is provided at a portion of the receiving frame 10 that engages and disengages when the blade 9 of the hexagon nut 8 with blade rotates.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a manhole cover having a lock structure as a backflow prevention measure in a manhole cover used for a sewage underground waterway.

[0002]

[Prior art]

 Conventionally, it has a structure that has a stopper that is swingably supported by a lid and that automatically locks by gravity, and that the lid has a relatively large through hole and has a stopper on it that can rotate. There is a configuration in which a flexible top is loosely fitted, a plate stop structure is provided, and a key hole is provided in the center for pivoting this.

[0003]

[Problems to be solved by the device]

 Originally, it is required that the manhole cover used for the sewage underground waterway does not have an open communication hole to prevent the inflow of rainwater and the escape of odor. However, in the above-mentioned prior art, the former requires a communication hole for inserting a tool such as a burl for releasing the lock when the lid is opened, and the latter allows the top to freely rotate. It is unsatisfactory because the keyhole communicates with each other because it requires a gap. Implementing this watertight structure with a simple structure is a technical issue to be solved.

[0004]

[Technical means for solving the problem]

 The technical means to solve the above-mentioned problem is to insert a long flat head screw into the lid in order to rotate it from the upper surface without protruding on the surface, and sandwich the rubber packing to keep the watertightness. The hexagonal nut is fixed by a nut, and a blade is attached to the hexagonal nut. When the blade rotates, the hexagonal nut is engaged with and disengaged from a projecting piece constituting a receiving frame that supports the lid.

[0005]

[Action]

 For example, in the case of this product installed in an area where there is a large amount of rainfall and the sewage groundwater channel is at a low altitude, the lid is lifted by the backflow from the groundwater channel, but the blades formed on the lid constitute the receiving frame. The rubber packing prevents the rainwater from flowing in from the lid surface and dissipating the odor.

[0006]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. 1 and 2, 1 is a cover, 2 is a through hole, 3 is a chamfered part for sinking the head of a long flat head screw 4, 5 is rubber packing, 6 is a washer, and 7 is a double nut. 3 is a hexagonal nut, 8 is a hexagonal nut with blades to which a blade 9 made of an iron plate or the like is welded, 10 is a receiving frame, and 11 is a projecting piece that engages and disengages with the blade 9. FIGS. 12 is a burr hole for prying open, 13 is a pin, 14 is a stopper that also serves as a weight, 15 is a through hole, 16 is a top having a stopper 17 and a key hole 18, 19 is a plate fixing screw, 20 Indicates an opening tool.

[0007]

[Effect of device]

 As described above, according to the present invention, the lock structure has a simple structure and maintains watertightness, and since the structure itself is compact, it can be easily applied to a small manhole cover, and it is highly productive and inexpensive. There is an effect that it can be provided.

[Brief description of drawings]

FIG. 1 is a front sectional view of a manhole cover in which the present invention is implemented.

FIG. 2 is an exploded perspective view of a partial cross section of a main part for implementing the present invention.

FIG. 3 is a front sectional view of a main part of a conventional structure example.

FIG. 4 is a front sectional view of a main part of a conventional structure example.

[Explanation of symbols]

1. Lid 2. Through hole 4. Flat head screw
5. Rubber packing 6. Washer 7. Hexagon nut 8. Hexagon nut with blade 10. Receiving frame 11. Protrusion 13. pin
14. Stopper that doubles as a weight 16. Top 17. stopper

Claims (1)

[Scope of utility model registration request] 1. A thick-walled portion is formed on a part of a peripheral edge of a lid body, and a hole penetrating in a vertical direction having a chamfered portion on an upper surface is formed in the portion,
A long countersunk screw into which the hole is loosely inserted is inserted, and a rubber packing, a washer, a hexagonal nut, and a hexagonal nut with blades are sequentially inserted into the protrusion of the flatscrew to be integrally and rotatably assembled. A manhole cover having a lock structure, characterized in that a projecting piece is formed at a portion of the receiving frame that supports the cover body, the projecting piece being engaged with and disengaged from the blade with the rotation of the blade hexagon nut.