JPS5838032Y2 - manhole frame - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a manhole frame installed at the opening of a manhole.

Conventionally, in order to make it easier to step into the manhole 2 from the ground surface 1, a ladder 4 as shown in FIG.
is being handed over.

In order to hang this ladder 4, conventionally, a pair of left and right support fittings 5, 5 are protruded from a position slightly below the top surface of the manhole side block 3, as shown in FIG. The leg ends 7, 7 of the ladder 4 are inserted to support the ladder 4.

However, in order to stabilize the support, the leg end 7.7 has a through hole 6,
When inserted deeply into the support fittings 5 and 6, the lower ends of the leg ends 7, 7
5 protrudes downward for a long time, so if you get too close to the handle 8 that protrudes downward, grab the handle 8 and pull the
It gets in the way when you go inside.

Further, when the leg ends 7, 7 enter a certain depth, a stopper 9 for stopping the leg ends 7, 7 must be provided on the leg ends 7, 7 by welding or scraping, which makes the production of the ladder 4 that much more troublesome.

Further, the through hole 6 is not suitable for inserting machinery or the like into the manhole or for securing a rope or the like.

This invention is a manhole frame proposed to eliminate the above-mentioned drawbacks.In order to achieve this purpose, the manhole frame installed at the opening of the manhole has a mounting collar on the inner periphery slightly above the lower end. around the collar, and a support plate is installed under this collar.

Then, on the outer band of the upper surface of the support plate, there is a small retaining protrusion that fits into the through hole of the brim portion and locks the support plate to the manhole frame, and on the inside side, there is a retaining protrusion that fits into the leg end of the ladder. It is equipped with a protrusion for use.

To further explain the embodiment based on the drawings, FIGS. 3 to 7 show that a manhole frame 14 has a seat 12 for the manhole cover 11 on the inner periphery of the upper end and a flange 13 on the outer periphery of the lower end. A collar portion 15 for mounting is provided around the slightly raised inner periphery, and a support plate 16 is attached to the lower surface of the collar portion 15.

This attachment is performed by fitting a small protrusion 17 provided on the outer side of the upper surface of the support plate 16 into the through hole 18 of the flange 15.

An engagement protrusion 21 into which the leg end 20 of the ladder 19 is fitted is provided on the inner side of the support plate 16.

If the ladder 19 used is one in which the treadle 23 is passed between the pair of left and right vertical bars 22, 22 as shown in FIG. However, if the ladder has rungs 23 protruding alternately on the left and right sides of one vertical rod 22 as shown in FIG. 5, the engaging protrusions 21 should also be as shown in FIG. One bottle is enough.

In order to fasten the support plate 16 to the collar 15, the collar 15 and corresponding screw holes 24, 24 provided in the support plate 16 are used.
The support plate 16 is fastened to the collar portion 15 through the bolts 25.

The inner side of the support plate 16 is fitted into the gap between the flange 15 and the upper surface of the manhole side block 3, and the small engagement projections 17 are fitted into the through holes 18 of the flange 15. Since the two are engaged, this bolt tightening is done just to be sure.

Next, to explain how to use it, first attach the support plate 16 to the collar 1.
5, attach the small protrusion 17 of the support part 16 to the collar part 1.
After fitting into the through hole 18 of No. 5, the support plate 16 is fastened to the collar portion 15 by screwing the bolt 25 into the screw hole 24.24.

To hang the ladder 19, first remove the manhole cover 11, and then fit the leg ends 20 of the ladder 19 into the engagement protrusions 21 to lower the ladder 19 from the ground surface 1 to the manhole 2.
The hook is passed over the top of the screen.

Although the embodiment of the improvement zone shows the case where the manhole frame 14 and the support plate 16 are separate bodies, it goes without saying that both may be formed integrally.

The manhole frame of the present invention has a retaining protrusion formed on the inner periphery of the lower part of the manhole frame as described above, so the ladder can be installed easily and stably. Since there is no protrusion, the ladder does not become a nuisance when going up and down, and the ladder does not require a stopper, making it easy to manufacture the ladder.

Furthermore, it also has the effect of making it easier to lock ropes, wires, etc. used when putting machinery etc. into the manhole.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing a conventional manhole frame, Fig. 2 is a perspective view showing a ladder, Fig. 3 is a longitudinal sectional view showing the manhole frame of the present invention, and Figs. 4 and 6 are the same perspective views. , FIG. 5 is a perspective view showing another example of the ladder, and FIG. 7 is a plan view showing the support plate. 14-manhole frame, 15 one flange, 16-support plate, 1
7 small protrusion, 18-through hole, 19-ladder, 20-leg end, 21
- Engagement protrusions.

Claims (1)

[Scope of utility model registration request] The manhole frame installed at the manhole opening has a protrusion on the lower inner periphery into which the leg end of the ladder fits (a manhole frame that will be discarded).