Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Having separate expander means – Bulged by axially contracting ends
Patent
1995-09-15
1998-10-13
Saether, Flemming
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Having separate expander means
Bulged by axially contracting ends
411 38, 411 59, 411 60, F16B 1304
Patent
active
058203214
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates generally to an expansion plug.
More particularly, it relates to an expansion plug which has at least one tensioning member and expansion means formed by a system of at least two expansion tubes encircling the tensioning member and fitted one within another, with each of the expansion tubes provided with a series of helical slots spaced in a circumferential direction and extending over a part of the length of the expansion tubes, so that by inserting an axial relative movement the peripheral sections are radially expanded in order to achieve an anchoring effect.
Expansion plugs are known in very many forms and serve for example for the stabilisation of walls, the formation of fixing points for the mounting, particularly hanging, of objects, and so on. They can be set into an existing bore in a wall, or they can be rammed into the wall or into the ground, and by the relative displacement of movable parts of the expansion plug--as a rule in the region of the bottom of the borehole--an expansion, notably an increase in diameter, of the relevant parts is produced which makes it possible for the plug to be held tight in relation to the material of the wall of the borehole and in this way to fix the plug.
From DE-OS 22 13 711 there is known an expandable screw fixing device whose essential feature consists of two expansion tubes of plastics material guided coaxially in one another, encircling a screw, and tensioned axially between a nut on the one hand and a point adjacent to the screw head on the other hand. Both expansion tubes are provided with a series of slots which define respective peripheral sections and which can have an axial or alternatively a spiral configuration. The outer expansion tube is connected to the nut by a connection which has an axially-acting shape-locking effect. The inner expansion tube defines a limit for the screwing in of the aforesaid screw, which is determined decisively by the length of the axial slots of this expansion tube which are shown.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an expansion plug which avoids the disadvantages of the prior art.
More particularly, it is the object of the invention to provide an expansion plug of the type first referred to above in which its usability is further improved, particularly for walls and ground conditions which are characterised by having poor strength or supporting capabilities, but also having regard to the force take-up capacity of the expanding body, particularly in its use as an abutment or stop. This object is achieved, in an expansion plug of the type first referred to above, by the slope of the slots of radially adjacent expansion tubes being of mutually opposite hand, and by the expansion tubes being arranged to be non-rotatable relative to one another.
The expansion device comprises an arrangement of at least two expansion tubes set one within the other, which are each provided with slots between which strip-like peripheral sections of tube remain, so that, by an axial compression, the peripheral sections remaining between the slots are radially expanded, and indeed by plastic deformation, so that the plastically deformed peripheral sections form a spatial structure which represents an anchoring body. Because the expansion tubes are positioned within one another, the expanded peripheral sections of the two tubes exert a supporting, and in particular reinforcing, effect on each other, which gives the expansion plug an increased resistance to tensile forces. It is an important feature of the invention that the slope of the helical slots of radially adjacent expansion tubes is of mutually opposite hand, with comparatively steep angles of slope being preferred. This means that in the case of the radial expansion the plastically deformed peripheral sections form a spatial structure which is characterised by a considerable rigidity and strength, indeed against both axial and also torsional stresses. In the expanded state
REFERENCES:
patent: 2269646 (1942-01-01), Burke
patent: 3942407 (1976-03-01), Mortensen
patent: 4920833 (1990-05-01), Rosenthal
GD-Anker Gruber-Duebel-Anker GmbH
Saether Flemming
Striker Michael J.
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