JPS6319654B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a height adjustable manhole.

In snowy regions, spiked tires are used when it snows, which causes roads to be scraped and lowered in height. As a result, the manhole installed on the road protrudes relatively from the road. For this reason, when a snowplow passes by, it hits the protruding manhole, causing accidents such as breakage and damage. Also, when resurfacing roads in early spring, the paving is done so that it is higher than the foundation height to account for the amount of road removal. For this reason, in the conventional structure in which the height of the manhole is fixed, there is a problem in that the manhole is relatively depressed.

For this reason, the inventor of the present invention first considered a method in which a lid receiving ring is screwed into the base ring, and the height of the manhole is adjusted by the screwed position. However, since the lid holder ring is heavy and large, there are problems such as time-consuming adjustment work.

The present invention was made in view of the above circumstances, and
The aim is to create a manhole whose height can be easily adjusted.

That is, the manhole of the present invention includes a base ring in which three or more height adjustment block guide grooves are formed along the circumferential direction of the inner circumferential surface, and a height adjustment block that has a fitting protrusion that is removably fitted into the guide groove. and a lid receiving ring that fits into the base ring and is placed on the height adjustment block.

The present invention will be described below based on illustrated embodiments. FIG. 1 is an exploded perspective view of the manhole, FIG. 2 is a sectional view thereof, FIGS. 3 and 4 are explanatory views of the operation, and FIG. 5 is a sectional view when the manhole is lowered. This manhole consists of a foundation ring 1 that is embedded in the road, a height adjustment block 2 that is attached to the inner peripheral surface of this foundation ring 1, and a lid that fits into the foundation ring 1 and has a lid 3 placed on top. It is equipped with a receiving ring 4.

The inner peripheral surface of the foundation ring 1 has height adjustment block guide grooves 5 and stopper grooves 6 at three locations in the circumferential direction.
...are arranged. Each guide groove 5... has a protruding piece 8, 8 attached to the side wall surface of a pair of groove-shaped gaps 7, 7 forming a rectangular parallelepiped shape, so that the inside of the gap 7, 7 has a rectangular cross section, and the surface has a rectangular cross section. It is shaped like a letter (or an inverted U-shape in cross section). The stopper grooves 6 are formed between the gaps 7 and 7 along the axial direction of the inner circumferential surface of the foundation ring 1, and do not penetrate through the upper end of the foundation ring 1 but extend halfway to form an upper wall. is used as a stopper. Further, at the lower part of the inner peripheral surface of the foundation ring 1, there is a stepped portion 1 on which the height adjustment block 2 is placed.
a is formed.

The height adjustment block 2 attached to the base ring 1 is fitted into the outer surface of a main body 2a that is curved along the inner peripheral surface of the base ring 1 to form a protrusion. This protrusion includes a pair of insertion pieces 2b,
2b is provided protrudingly, and locking pieces 2c, 2c are provided protruding laterally from these insertion pieces 2b, 2b. Here, the insertion pieces 2b, 2b are formed with an interval and width that allow them to be inserted into the side gaps between the gaps 7, 7 and the protruding pieces 8, 8, and the locking pieces 2c, 2c are and the protruding pieces 8, 8 are formed at intervals and widths that allow insertion into the upper gaps.

On the other hand, the lid receiving ring 4 has a stepped portion 4a formed on its inner peripheral surface, on which the lid 3 is placed.
Furthermore, protrusions 9 that can be protruded and retracted are provided at three locations on the outer peripheral surface in the circumferential direction, and these protrusions 9 protrude into the stopper grooves 6. It is inserted into the foundation ring 1 and placed on the height adjustment block 2.

The manhole constructed in this manner is assembled in the following manner.

First, as shown in FIG. 3, lift the lid receiving block 4 upward. In this case, since the protrusion 9 catches on the upper end of the stopper groove 6, the lid receiving block 4
never deviates from basic block 1.

In this state, hold the prepared height adjustment block 2 of a predetermined height and insert the insertion pieces 2b, 2b and the locking piece 2.
c, 2c are inserted into the gaps 7, 7, and lowered in the inserted state, and the height adjustment block 2 is placed on the bottom surface of the base block 1. In this case, the locking piece 2c
is blocked by the protruding piece 8, and the height adjustment block 2 will not come off.

Next, when the lid receiving ring 4 is lowered, it is placed on the height adjusting block 2, and the lid receiving ring 4 protrudes from the base block 1 by the amount of the height adjusting block 2. Then, the lid 3 is placed on the lid receiving ring 4, and the work is completed.

On the other hand, in order to lower the manhole as shown in Fig. 5, the operation described above is reversed, and after removing the height adjustment block 2, the lower height adjustment block 2' is removed. This is done by attaching it using the operations described above.

In the above embodiment, the guide grooves are formed in three places, but the guide grooves may be formed in four or more places. Further, the mounting mechanism for the guide groove and the height adjustment block is not limited to the above embodiment. In short, it is sufficient if the height adjustment block can be detachably attached. Furthermore, although the embodiment has described height adjustment using two types of height adjustment blocks, it goes without saying that three or more types may be used.

As explained above, according to the present invention, the height of the manhole can be adjusted by simply replacing the block with a height adjustment block of a different height, so it is extremely effective as a manhole in snowy areas.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is an exploded perspective view of a manhole, Fig. 2 is a sectional view, Figs. 3 and 4 are illustrations of height adjustment, and Fig. 5 is an illustration of height adjustment. FIG. 4 is a cross-sectional view when using different height adjustment blocks. DESCRIPTION OF SYMBOLS 1...Foundation ring, 1a...Step part, 2...Height adjustment block, 2a...Main body, 2b...Insertion piece, 2c...Locking piece, 3...Lid, 4...Lid receiving ring, 4a...Step part, 5
...Height adjustment block guide groove, 6...Stopper groove, 7
...Gap, 8...Protruding piece, 9...Protrusion.

Claims (1)

[Claims] 1. A base ring in which three or more height adjustment block guide grooves are formed along the circumferential direction of the inner circumferential surface, a height adjustment block equipped with a fitting protrusion that is removably fitted into the guide groove, and a height adjustment block in the base ring. A manhole comprising a lid receiving ring that is fitted into the manhole and placed on a height adjustment block.