Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent
1992-11-03
1996-03-12
Corbin, David H.
Hydraulic and earth engineering
Earth treatment or control
Rock or earth bolt or anchor
411 78, 411 80, F21D 2100, F16B 202
Patent
active
054981085
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION AND PRIOR ART
The present invention is related to an anchoring device comprising an elongated element introducable into a hole and means for securing the element against withdrawal from the hole.
Such anchoring devices may be used for securing various objects, such as electric cables, ventilation ducts and cabinets, relative to house walls and ceilings, rock walls and similar. In this type of devices the securing means is adapted to directly or indirectly co-act with the wall of the hole, said means possibly being formed by threads cut in the elongated element and adapted to engage in the wall of the hole or a plug introduced into the hole, various types of expanding members, which are pressed apart and against the wall of the hole when hammering a bolt into a hole, and numerous similar means.
One thing is, however, common to all these devices previously known: they are expensive to manufacture since they require a fine-mechanical work, which is of a high precision and most often relatively extensive. Another disadvantage associated to the devices previously known is that they only can be used, once they have been produced, for a certain hole dimension or hole dimensions lying within a very limited range. Furthermore, it is generally necessary to design the securing means so that they are suitable for securing relative to a hole wall of a particular material or a particular type of material, e.g. rock, wood or the like. For anchoring in underlayers of another type of material than the one, for which the device in question is adapted, various types of adjustment means are necessary, such as plugs, sleeves and the like.
SHORT DESCRIPTION OF THE INVENTION
The object of the present invention is to provide a device of the kind mentioned by way of introduction, said device being more simple and more non-expensive to produce than the previously known devices of this type and capable of being used for holes having somewhat differing dimensions and differing wall material characters; the device should at the same time have an operational capacity at least as good as but preferably improved relative to the previously known devices in respect of anchorage capacity.
This object is according to the invention obtained by providing a device of the nature defined by way of introduction with the features enumerated in the characterizing part of the enclosed claim 1.
Since the securing means comprise the part movably connected to the elongated element and this part is adapted to move, on attempt to withdraw the element from a hole, by generation of friction against the hole wall, relative to the element while increasing the combined transverse dimension of the element and part, it is possible to achieve a very efficient anchorage of the element in the hole in question. The element and part may easily be produced so that the device may be used for anchoring in holes with differing transverse dimensions. Since the movable part is adapted to move outwardly from the elongated element on attempt to withdrawal from the hole, securing may occur relative to hole walls of the most different materials and types since it is not necessary in practice that the movable part is able to engage in the hole wall with its peripherical portions, but the wedge action obtained by the movable part in co-operation with the elongated element and the hole wall suffices.
It is also possible to maintain the production costs for an anchoring device according to the invention at a very low level since no machining over the general extent of the elongated element or complicated forming of various types of tines or similar are required. No excessively high precision is required on production of the elongated element or the movable part and this is of course favourable for the production costs.
Another advantage with the device according to the invention is that it easily may be designed so that attempts to additionally introduce an element anchored in a hole into said hole cause a movement backwardly of the movable part in a dir
REFERENCES:
patent: 3478641 (1969-11-01), Dohmeier
patent: 4669935 (1987-06-01), Herb
Derwent's abstract, No. 89-346 791/47, SU 1 460 444, publ. week 8947 (Kuib Vniiproektelek).
Derwent's abstract No. C25 41 D/11, SU 731 104 publ. week 8111 (Olkhin SA).
Corbin David H.
Engellenner Thomas J.
Kelly Edward J.
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