DE1708524C

DE1708524C - Manhole cover, especially for roads

Info

Publication number: DE1708524C
Application number: DE19681708524
Authority: DE
Inventors: Gerald London Robinson
Original assignee: Broads Manufacturing Co., Ltd., London
Priority date: 1967-03-20
Filing date: 1968-01-02
Publication date: 1973-03-08

Description

gebildet. Die anderen beiden Ecken eines jeden dreieckigen Deckelteiles weisen entsprechende Fortsätze 5 auf, und diese werden in nebeneinanderliegenden Ausnehmungen 6 aufgenommen. Die beiden Teile des Deckels 4 liegen entlang einer linie 7, d. h. einer Diagonale über dem Rahmen 1, aneinander und jeder Deckelteil weist einen Rücksprung 7 A auf, wodurch die beiden Teiie an den Rückspriingen 7 A eine relativ kleine Belüftnngsöffnung bilden. Weiter weist jeder Teil des Deckels 4 bekannte öffnungen 8 zum Einsetzen eines zum Herausnehmen des Deckels dienenden Werkzeuges auf.educated. The other two corners of each triangular cover part have corresponding extensions 5, and these are received in recesses 6 lying next to one another. The two parts of the cover 4 lie against one another along a line 7, ie a diagonal above the frame 1, and each cover part has a recess 7 A , whereby the two parts at the recesses 7 A form a relatively small ventilation opening. Furthermore, each part of the cover 4 has known openings 8 for inserting a tool used to remove the cover.

Die geraden Ränder des Rahmens 1 weisen regel-The straight edges of the frame 1 usually

mäßig angeordnete, vorspringende Stege 9 auf, zwischen welchen Öffnungen 10 bestehen. Die Stege 9 sind einstückig mit dem durchgehenden, aufrecht stehenden Flansch 11 des im wesentlichen L-förmigenmoderately arranged, projecting webs 9, between which openings 10 exist. The webs 9 are integral with the continuous, upright flange 11 of the substantially L-shaped

Rahmens ausgebildet; der waagrechte Flansch 12 weist nach innen.Frame formed; the horizontal flange 12 points inwards.

Der von den Dreieckselementen gebildete Deckel 4 ist in der entsprechenden Richtung kleiner als der Abstand zwischen einander gegenüberliegenden Ste-The cover 4 formed by the triangular elements is smaller than that in the corresponding direction Distance between opposing

gen 9, so daß also ein Spalt 15 am Umfang des ganzen Deckels entsteht. Die öffnungen 10 zwischen den Stegen und der Spalt 15 bilden damit eine durchgehende und relativ große Belüftungsöffnung.gene 9, so that a gap 15 on the circumference of the whole Lid is created. The openings 10 between the webs and the gap 15 thus form a continuous one and relatively large ventilation opening.

Hierzu 1 Blatt Zeichnungen1 sheet of drawings

Claims

in the case of also being equipped with ventilation openings, claims: these can only be implemented with a limited diameter, since larger ventilation openings have the

1. Manhole cover, especially for straightened triangular cover elements too much, with a frame, the upper edge of which was weakened with 5 and no longer the required Surface of the insertable cover, in particular mechanical strength, must be guaranteed special one would consist of two triangular elements. (U.S. Patent 2,997,932).

existing cover, is aligned, with the shaft part- The object of the invention is

cover is provided with ventilation openings, it means creating a manhole cover

characterized in that at least one ventilation is provided, which is not

one part of the frame (1) goes inwardly to the mechanical strength of the cover,

send, with the surface aligned extension The solution to this problem is based on

has, which with the openings (10) for loading a manhole cover of the type defined above,

ventilation is provided. in that according to the invention at least part of the

2. Manhole cover according to claim 1, there being an inward-facing frame with the upper through-hole characterized in that it has an aligned extension of the inner surface with the öff-Wandfiachen of the frame (1) is provided with inwards for ventilation. In contrast Jumping webs (9) in the direction of the edge to the acquaintance so no longer points the Schachtdes Cover (4) protrude and that the openings cover the ventilation openings, but these are (10) are formed between two webs (9), ao the in cooperation with the frame and the

3. Manhole cover according to claim 2, that cover or the edge of the cover is provided, characterized in that for the formation of a zu- that the cover is not further through ventilation openings additional, around the cover Lüf- is weakened in cross section and therefore very much much processing gap (15) which can be more mechanically stressed by the ends of the webs (9),
delimited clear opening of the frame (1) by 35. In detail, the invention can thereby experience a front of the gap width is greater than the surface of the partial development that of the inner cover (· '). Ren wall surfaces of the frame inwardly projecting webs in the direction of the edge of the lid

protrude, and that the openings between each two

30 webs are formed. This results in a smooth transition between frame and

The invention relates to a manhole cover, in particular cover, and when clogging this so formed special for roads, with a frame, the top ventilation openings can be cleaned very easily and rer edge with the surface of the visible cover quickly after removing the manhole cover,
kels, in particular one made of two triangular elements 35 to the effective total ventilation cross-section existing cover, is aligned, whereby the Schachtab- to make as large as possible, the invention is provided with ventilation openings dadeckung. due to a particularly useful execution

A circular cast-iron shaft shape has already been obtained that is known to form an additional cover for roadways or the like, and this small ventilation gap shaft cover running around the cover has 40 tes in the road surface and bordered by the ends of the webs clear ventilation holes, which are symmetrical with respect to their opening of the frame by the gap width larger axis and whose cross-sections than the surface of the cover,
at least in part by curves of the second order. The cover can be continuously limited during manufacture. In order to increase the mechanical strength of this manhole cover, which is extremely well known to the material for a given weight, the length should be ₄₅ . The opening axis of the ventilation hole cross-section of the opening cross-section required for ventilation is distributed over the entire circumference, so that the manhole cover runs radially, so that the individual openings can effectively be very small, and it arises, so that the individual openings can be arranged in the desired manner nevertheless a higher material is retained and the cover has a large overall cross-section of the opening. In that its cross-section is thus less weakened. However, despite this special arrangement and the entire edge of the frame, the vent holes must not be deformed, the manhole cover in the vent openings must not be designed in a special way in order to achieve adequate results is represented by the following order

Ensure adequate security against breakage of the cover to provide an exemplary embodiment with reference to the purpose for which the underside of 55 explains the drawing in more detail. It shows
Manhole cover is reinforced with ribs, the example F i g. 1 with a top view of a manhole cover

be designed in one piece with the lid, the lid consisting of two triangular parts,
be able. The production of such a cover is depending on F i g. 2 shows a section through the frame according to FIG

but not only relatively expensive, but also production line BB in FIG. 1 and

technically difficult (Austrian patent 60 Fig. 3 a view of the font 238 108 shown in Fig. 2). Frame part too! the direction of arrow Y in

It is also already known to use the framework of a FIG. 2.

The manhole cover is essentially rectangular. The frame 1 of the access opening is essentially

and the manhole cover in the form of two triangles with a square cross-section and flat. the Kiger cover elements in this rectangular frame cover 4 consists of 7 two triangular elements. On men use that these triangular cover elements two corners 2 of the frame 1 is each a Ausnehmente Supported at their corners on the frame for receiving a respective extension 3 on the the. These triangular cover elements can there- tip of a triangular part of the cover 4 from