[0001] The present invention relates to a net anchoring means intended to anchor a reinforcing
net or a similar object outside an insulation layer which is secured for instance
to a wall by means of a mounting means, for instance a collar sleeve, whereby the
net anchoring means is introduced through a bore of the collar of the mounting means
and is prevented from being retracted by means of hooks or nabbies which are supported
round the bore edge at the inner surface of the collar.
[0002] When constructing new buildings having an extra insulation it is often desirous to
apply a layer of plaster on top of the insulation layer, for instance a layer of mineral
wool. It is necessary to reinfoce such a layer of plaster and this is mostly made
by means of a reinforcing net of reinforcing mesh which thereby has be secured to
the base wall. This is preferably made by utilizing the same mounting means as used
for holding the insulation layer. An especially suitable mounting means is a so called
collar sleeve according to Swedish patent application nr 8600388-6. Said mounting
means is formed with a collar on a pin which is, in turn, secured in the wall.
[0003] The reinforcing net is thereby anchored by means of a so called net or mesh anchoring
means having hooks or nobbies distributed round the bore edge of the collar of the
mounting means, so that each mesh anchoring means anchors a wire of the reinforcing
net or, in special cases, two or more crossing wires.
[0004] Different possibilites have been comtemplated for the purpose of reducing the number
of anchoring points. In this connection the present invention has been developped
as a means for obtaining anchoring forces of a magnitude which have so far not been
able to obtain.
[0005] The invention relates to a net or a mesh anchoring means having inwarly to the base
wall facing hooks or nobbies and a through bore, so that plaster can enter the anchoring
means when applying the plaster, and so that the plaster, after having become hardened,
prevents the hooks or nobbies of the anchoring means from becoming pressed together
thereby making it possible to disconnect the anchoring means. The bore of the anchoring
means must have a minimum diameter. Preferably the bore is conical so that the bore
is wider at the outer end than at the inner end. At least a third of the length of
the bore ought to be conical.
[0006] The achoring means for the reinforcing net or mesh is most preferable if it is dimensioned
so that the body of the anchoring means can be moved through a mesh of the net whereas
the head of the anchoring means has a diameter which is greater than the mesh width.
In such case the load in the direction outwards from the base wall is symmetrical,
and the necessary force for retracting the anchoring means is still higher.
[0007] The reinforcing net is anchored by means of the net anchoring means so that the net
anchoring means is holding a wire of the reinforcing net, in other words so that the
anchoring means is straddling over a wire of the net. The net anchoring means also
can be placed so that the head of the anchoring means covers all four wires of a net
mesh, which wires are parallel in pairs.
[0008] The very best result is obtained if the net anchoring means is introduced in the
centre of the collar sleeve.
[0009] In the following the invention is to be explained with reference to six different
figures. Figure 1 is a cross section view through a net anchoring means according
to the invention, and figure 2 shows the same anchoring means from outside. Figure
3 shows a modified embodiment of the anchoring means according to figure 1, and figure
4 shows the same anchoring means from outside. Figure 5 shows another modified embodiment
of the anchoring means of figure 1, and figure 6 shows the same anchoring means from
outside.
Figure 1 shows the pin 1 of a collar sleeve introduced through a layer 2 of insulating
material, which is maintained by the collar 3 of the collar sleeve. Wings 4 are formed
between the pin 1 and the collar 3, which wings are intended to allow a certain angular
dispacement of the collar 3 in relation to the pin 1. Outside the collar 3 there is
a reinforcing net 5 which is kept in contact with the collar 3 by means of a net anchoring
means 6, or more exactly by the head 7 of the anchoring means 6. The net anchoring
means is formed with hooks 8 which hold the the net anchoring means 6 and thereby
the reinforcing net 5 in contact with the collar 3 after the the net anchoring means
has been introduced through the bore of the collar 3. Plaster applied to the net anchoring
means will enter a bore 9 of the net anchoring means and thereby enter the space between
the hooks 8. Thereby said hooks 8 can not be compressed by using reasonbale forces
and it becomes difficult or impossible to retract the net anchoring means from the
collar sleeve.
Since the head 7 has a greater diameter than the mesh width of the net 5 said
head will cover at least two parallel wires of the mesh, eventually all four wires
of the mesh, which wires are parallel in pairs. A retraction force thereby can not
pull the net anchoring means into an inclined position.
Figure 2 shows the arrangement of figure 1 from outside. The figure shows the collar
3 of the collar sleeve and the reinforcing net 5 in contact therewith. A net anchoring
means is introduced through a mesh of the net so that the head 7 of the anchoring
means 6 keeps the net 5 nailed to the collar 3. The figure shows the bore 9 of the
net anchoring means, through which the plaster can be introduced.
Figure 3 shows an embodument of the net anchoring means, in which the hooks or nobbies
10 provide a conical bore 12 which facilitate the introduction of the plaster.
Figure 4 shows the embodiment of figure 3 seen from outside, and it is obvious that
the head 13 of the net anchoring means 11 keeps the reinforcing net 5 anchored in
that the head 13 extends over all four wires of a mesh of the reinforcing net 5.
Figure 5 shows the same embodiment as in figure 1 except that the net anchoring means
has been aplied so as to straddle over a wire of the reinforcing net 5. The head 7
thereby will extend over at least one of the two parallel wires of the net mesh extending
perpendicularly to the wire being straddled over.
Figure 6 shows the same embodiment as in figure 1 but seen from outside.
[0010] Comparative tests with different net anchoring means and different location thereof
in relation to the meshes of the reinforcing net have shown the following looseining
forces.
1. A net anchoring means (6) intended for anchoring of a reinforcing net (5) or a
similar object outside an insulation layer (2) mounted for instance on a wall by means
of an mounting means (1, 3), for instance a collar sleeve, whereby the net anchoring
means (6) is introduced through a bore of the collar (3) of the mounting means (1,
3) and is blocked against retraction by means of hooks or nobbies (8; 10) of the anchoring
means (6) engaging the bore edge on the inner side of the collar (3), characterized in that the net anchoring means (6) is formed with a through bore (9; 12) making
it possible for plaster to enter the interior of the anchoring means (6) thereby preventing
the hooks or nobbies (8; 10) from leaving their engagement with the bore edge.
2. Net anchoring means according to claim 1, characterized in that the through bore (12) is conical, at least from the outer edge thereof and
a distance inwards, pereferably to at least one third of the length of the anchoring
means (6).
3. Net anchoring means according to claims 1 and 2, characterized in that the body of the anchoring means has a diameter which is less than the mesh
width of the reinforcing net (5) to be secured, whereas the head thereof (7; 13) has
a diameter which is larger than than the said mesh width.
4. Net anchoring means according to claims 1 - 3, characterized in that it is adapted to cooperate with the central bore of a collar sleeve (1, 3)
having a central through bore.
5. Net anchoring means according to claims 1 - 4, characterized in that the head of the anchoring means is formed like a ring (7; 11) the width of
which is not larger than one third of the mesh width.
