JPS607415Y2 - iron lid - Google Patents

Description

[Detailed description of the invention] This invention relates to iron covers such as manholes and gutter covers.

Generally, manhole covers and the like are hinged at one end to the outer frame, but they can be divided into two types: those with the hinge protruding toward the cover, and those with the hinge recessed toward the outer frame. There is a model version.

In the former case, there is a risk that up to several protruding objects may pose a hazard to workers and materials carried in and out, and the effective inner diameter of the manhole will be smaller than the nominal inner diameter of the manhole. In the latter case, the outer diameter of the outer frame is increased unnecessarily, making it expensive.

In addition, many conventional lids tend to become clogged with sand in the gaps between the hinges, making it difficult to open and close them.

Although this device uses an outer frame with a relatively small outer diameter, there are no dangerous protrusions, and the effective diameter can be made equal to the nominal diameter. The purpose of this invention is to realize an iron lid that does not cause problems, and this will be explained below based on the illustrated embodiments.

In FIG. 1, 1 is an iron outer frame, and 2 is an iron lid.

The lid 2 has recesses 3, 3.3 at appropriate positions on the periphery for inserting a tool for opening the lid, as well as cut grooves 4 for hinges at appropriate positions on the periphery.
has.

As shown in FIGS. 2 and 3, wall-shaped bearing portions 6.6 are formed at both edges of the cut groove 4 and are connected to the peripheral wall 5 of the lid 2. Hole 7.7 is drilled.

Reference numeral 8 denotes a tomoe-shaped hinge, which consists of a plate-shaped head 10 having an axial hole 9, a tail 11 having a circular cross section and curved in a vertical plane, and a distal end 12 expanding in the lateral direction. Shaft holes 7, 9
It is supported within the cut groove 4 by a pin 13 inserted at an angle of 7°.

Note that 13a is an enlarged head provided at one end of the pin 13;
b is an annular groove provided at the opposite end, and 13c is a retaining piece fitted into the groove 13b.

The outer frame 1 has an inner circumferential wall 14 that fits into the circumferential wall 5 of the lid 2 over the entire inner circumference, and the inner circumferential wall 14, the outer circumferential wall 15, and the side wall 1 are arranged at appropriate locations.
It has a hinge chamber 18 surrounded by 6, 16 and a bottom 17.

In the portion where the hinge chamber 18 is present, the inner peripheral wall 14 has a vertically elongated window 19 at a position that matches the cut groove 4 of the lid 2, and has a sand discharge hole 20 at the lower end.

The horizontal width of the window 19 is equal to the large tip 12 of the hinge fitting 8.
is selected to be smaller than the width of

When assembling, the hinge metal fitting 8 is laid down horizontally, the tip part 12 is passed through the window 19, and the tail part 11 is inserted into the hinge chamber 18.
2, and is rotated to the state shown by the chain line in FIG. 2, and is connected by the pin 13 to M2, which is placed upside down as shown by the chain line.

When the lid 2 is rotated 1800 times in a vertical plane from this assembled state, it is closed to the state shown by the solid line.

Conversely, when the lid 2 is closed, rotate it 180° in the vertical plane.
When rotated, the lid is opened as shown by the chain line.

Here, when examining the open state and the closed state using the figures, when the cover is open, a part of M2 or the hinge fitting 8 hardly protrudes inward of the outer frame 1, so the manhole It is extremely safe and easy for people to move in and out of the building, and for materials to be brought in and out.

Also, if the lid tends to tip over to the side when opening or closing,
There are many dangers such as the lid falling onto the worker's feet, but the structure of the hinge metal fittings mentioned above prevents the lid from falling to the side, so the worker can apply sufficient force to the lid with peace of mind. , can be opened and closed easily.

Additionally, since the window in the hinge chamber is installed on a nearly vertical surface, dirt and sand that enters the hinge chamber through the gaps in the hinge metal fittings is less likely to enter the hinge chamber, and even if some sand does enter the hinge chamber, it is easily discharged. It is smoothly discharged from the hole 20.

Therefore, with this invention, even if the outer diameter of the outer frame is not as large as shown in the left, there are no dangerous protrusions, the effective inner diameter can be set to almost the nominal inner diameter, and there is no possibility of opening or closing due to sand clogging. It is possible to realize an iron lid that is safe and easy to open and close without any hindrance.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of this invention, FIG. 2 is an enlarged sectional view taken along line A--A in FIG. 1, and FIG. 3 is a sectional view taken along line B--B in FIG. 2. 1...outer frame, 2...lid, 4...
- Cut groove, 5... Peripheral wall, 8... Hinge fitting, 10... Its head, 11... Its tail, 12... ...The tip of the ampulla, 13... Zen, 18... Hinge chamber, 19... Window.

Claims (1)

[Scope of utility model registration request] a lid having a notched groove at one end; an outer frame having an inner peripheral wall that fits into the peripheral wall of the lid; and a head rotatably supported in a vertical plane by a pin extending within the notched groove and crossing this. and a hinge metal fitting having a tail portion curved in the direction of the outer frame in the vertical plane and having an enlarged tip, and a hinge metal fitting that is bored in a part of the inner circumferential wall of the outer frame and through which the hinge metal tail portion is inserted and the horizontal width thereof. An iron lid having a window whose width is smaller than the width of the enlarged tip of the hinge metal fitting, and a hinge chamber provided in the outer frame at a position behind the window.