Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1991-04-17
1994-08-23
Neuder, William P.
Road structure, process, or apparatus
Pavement
Vault cover-closure
49465, E05C 1906
Patent
active
053402324
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a manhole cover which comprises a frame anchored in the ground and having a lower-lying supporting shoulder at least partially surrounding the frame aperture, and a grating or cover resting on said shoulder and fitting flush with the frame aperture.
Manhole covers of this kind must be secured in such a way that the grating or cover cannot jump out of the frame due to the action of vehicles driving over the top and, as far as possible, also in such a way that they cannot be removed by unauthorised persons. In a known solution, grating and frame are screwed together.
It is the object of the invention to indicate a manhole cover of the generic type with a securing device which allows the grating or cover to be fitted and removed as easily as possible.
The invention, as characterised in the claims, creates a manhole cover in which the grating or cover is secured automatically when fitted, without the necessity for an additional operation. Removal is equally simple, it being easy to design the manhole cover in such a way that the grating or cover can be removed only by means of a special tool, but easily and rapidly with it.
Further advantages of the invention consist, in particular, in the fact that the frame can be simpler in design than if a screwed connection were provided, and in the simplification of the production of the frame and of the grating or cover, since the drilling of holes and tapping of threads is superfluous and operations are thus omitted.
The invention is explained in greater detail below with reference to Figures which represent only embodiments:
FIG. 1a shows a plan view of a first manhole cover according to the invention,
FIG. 1b shows a sectioned perspective representation of the manhole cover according to FIG. 1a,
FIGS. 2a-c show the opening of the manhole cover according to FIGS. 1a, 1b, in section,
FIG. 3 shows a second manhole cover according to the invention, in perspective,
FIG. 4 shows a further manhole cover according to the invention, in section,
FIGS. 5a-f show securing elements and their anchoring on the frame in the case of various manhole covers according to the invention, in section,
FIGS. 6a,b show a further manhole cover according to the invention,
FIG. 7 shows a variant of the manhole cover according to FIGS. 6a,b, in section,
FIG. 8 shows a further manhole cover according to the invention, in section,
FIG. 9 shows a manhole cover according to the invention with a securing element attached to the grating, in section, and
FIG. 10 shows a variant of the manhole cover according to FIG. 9, likewise in section.
The manhole cover depicted in FIGS. 1a, 1b has a frame 1 with a two-part, lower-lying supporting shoulder 2, on which a grating 3 rests.
According to the invention, two securing elements 4a,b arranged diametrically opposite to one another are attached to the frame. They are preferably of one-piece spring-steel construction and mounted on the frame 1. The securing element 4a here fits over the top of shoulders 5a,b on both sides, thus producing a snap-in connection which secures it on the frame 1. The securing element 4a comprises a retaining element 6, which is designed as a resilient tab extending obliquely upwards and adjoining which is a locking element 7. On its upper surface, the grating 3 has a recess 8, the base of which is formed by a locking surface 9. The locking element 7 and the locking surface 9 are in engagement with one another and in this way secure the grating 3. The second securing element 4b is preferably of identical design to the first locking element 4a but can also be replaced by some other device, e.g. by a projection on the frame which engages in a recess on the surface of the grating (for further possibilities see below).
Suitable materials for securing elements are, in particular, metallic materials, in particular spring steel and other steel grades or cast iron containing spheroidal graphite, as well as corrosion-resistant plastics.
As depicted in FIGS. 2a-c, the manhole cover is unlocked by pulling back the locking
REFERENCES:
patent: 4570399 (1986-02-01), Wentink
patent: 5071177 (1991-12-01), Spiess et al.
Galvanetto Francois
Spiess Hansruedi
Neuder William P.
Von Roll AG
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