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(11) | EP 0 940 521 A1 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Wire bead for plaster, stucco and the like |
| (57) The invention relates to a wire bead (1) for plaster, stucco and the like comprising
a strip of bent diagonal wires (2) and longitudinal (3) wires welded to one another,
in which the strip is bent at angle around a longitudinal wire (4) to form a wire
bead having a substantially L-shaped cross-section with one short leg (5) and one
long leg (6), whereby the angle (a) between the short leg (5) and the long leg (6)
of the L-shaped wire bead (1) is greater than 90°. |
[0001] The present invention relates to a wire bead for plaster, stucco and the like comprising a strip of bent diagonal wires and longitudinal wires welded to one another, in which the strip is bent at angle around a longitudinal wire to form a wire bead having a substantially L-shaped cross-section with one short leg and one long leg.
[0002] Such wire beads or wire profiles of galvanized or stainless steel wire having a substantially L-shaped or asymmetrical cross-section are generally known and are sold by the applicant, N.V. Bekaert S.A., under the trademark "MIDRA"®.
[0003] Such wire beads are used in particular as plaster or stucco profile edging in plastering or stuccoing wall surfaces, in particular at the corners of building components. These wire beads exhibit many advantages, such as in particular the very open network structure due to which the steel wires, which are welded to one another, are very well embedded in the plaster, stucco or other cementitious material of the covering layer.
[0004] A special embodiment of a wire bead is known from European Patent Application No. 0705.949 of applicant N.V. Bekaert S.A. The wire bead having a virtually V-shaped cross-section according to the said patent application has the particular characteristic that the longitudinal wire running along the apex of the wire bead has a longitudinal profile with a substantially triangular cross-section. Said triangular cross-section is preferably a hollow profile with a longitudinal nose piece or sleeve overlying the length of the apex wire.
[0005] It is an object of the present invention to provide a new type of wire bead suited in particular for use for precise finishing of plastering or stuccoing at the plinth of a wall and is also very suitable for use in combination with a wire bead according to European Patent Application No. 0705.949.
[0006] It is another object of the present invention to provide a new type of wire bead suited in particular for use as an expansion joint in a plastered or stuccoed wall.
[0007] It is yet another object of the present invention to provide a new type of wire bead suitable for forming a vertical separation between a plastered or stuccoed wall and other surfaces, such as wooden or brickwork and masonry walls.
[0008] The present invention will be explained in more detail in the following description on the basis of the accompanying drawing. In the drawing :
- Fig. 1.
- shows, in perspective, a portion of a wire bead according to the invention ;
- Fig. 2.
- shows in cross-section a wire bead according to the invention fixed to a wall and embedded in the cementitious material ;
- Fig. 3.
- shows a detail of the wire bead shown in Fig. 2 ;
- Fig. 4.
- shows, in perspective, portions of two wire beads according to the invention for forming an expansion joint in a plastered or stuccoed wall, and
- Fig. 5.
- shows in cross-section, a modified embodiment of a wire bead according to the invention.
[0009] Fig. 1 shows, in perspective, a portion of a wire bead 1 according to the invention. The wire bead 1 comprises bent diagonal wires 2 and longitudinal wires 3 that are welded to one another. The diagonal wires 2 are preferably bent in a sinusoidal shape. The longitudinal wires 3 are by preference almost completely straight. The diagonal wires 2 and longitudinal wires 3 which are welded to one another form a wire strip with a very open network structure. The wire bead 1 is bent at an angle α around a longitudinal wire 4 to form a wire bead having a virtually L-shaped cross-section with one short leg 5 and one long leg 6.
[0010] The wire bead 1 according to the invention is characterized in particular by the fact that the angle α between short leg 5 and long leg 6 of the L-shaped wire bead is greater than 90°.
[0011] Fig. 2 shows, in cross-section, how the wire bead 1 can be used for precise finishing of plastering or stuccoing work 13 above the plinth 11 of an external wall 12. The plinth 11 is made of tradi-tional brickwork that does not require plastering. A plaster coating 13 is applied to external wall 12 above the plinth 11 ; the bottom section of the plaster-work 13 is solidly anchored and supported in the horizontal wire bead 1. Here, long leg 6 of wire bead 1 is fixed with the external wall 12 using an ordinary adhesive mortar or galvanized clamps.
[0012] Figs. 1 and 2 show clearly that short leg 5 of the L-shaped wire bead 1 according to the invention is covered with a plastic sleeve 7. The plastic sleeve 7 preferably consists of a hollow longitudinal profile 8 overlying short leg 5 of wire bead 1. Fig. 1 shows only a portion of longitudinal profile 8 overlying the short leg 5 of the wire bead 1.
[0013] Width a of the short leg 5 may be, e.g. 10 to 20 mm, whereas width b of the long leg 6 may be, e.g. 65 to 85 mm. The ratio between width b of the long leg 6 and width a of the short leg 5 will vary by preference around 3 to 5.
[0014] Fig. 3 shows in detail the bottom portion of the wire bead 1 anchored in the plaster or the stucco 13. Fig. 3 clearly shows that the hollow plastic longitudinal profile 8 has a substantially U-shaped cross-section, the body 9, in particular the outer wall thereof, runs almost parallel with the long leg 6 of the bead wire 1. The two upright flanges of the U-shaped plastic profile 8 run almost parallel with the short leg 5 of the L-shaped wire bead 1 and preferably have longitudinal grooves or protruding ribs 10 on the outer wall thereof in order to increase the anchoring of plaster or stucco coating 13.
[0015] The L-shaped wire bead 1 according to the invention with the substantially U-shaped plastic longitudinal profile 8 is particularly suitable for use with the known V-shaped wire bead embodiment of European Patent Application No. 0705.949, whereby the apex longitudinal wire has an overlying plastic profile with a substantially triangular cross-section. In this case, the wire bead 1 according to the invention is used as a horizontal corner profile, whereas the wire bead embodiment from European Patent Application No. 0705.949 is used as a connecting vertical or upright corner profile.
[0016] Fig. 4 shows in perspective how two wire beads 1 according to the invention can be used successfully to form an expansion joint 14 in plaster or stucco work 13 on a wall. The two wire beads 1 are held fast to the wall 12 by the long leg 6, after which the space between the wall 12 and the two short legs 5 of the wire beads 1 can be filled in using a suitable elastic sealing material 15, such as a flexible plastic material. The longitudinal profiles 8 set on the short legs 5 form the required seal for the sealing material 15.
[0017] Fig. 5 shows a modified embodiment of the wire bead 1 according to the invention. The long leg 6 of the wire bead 1 has a flexure or kink more or less half-way up, whereby the distance from the top of the kink 16 and the external wall 12 being by preference approximately 10 mm. The advantage here is that the wire bead 1 has a sturdier structure and the plaster or stucco 13 is anchored more effectively.
1. Wire bead (1) for plaster, stucco and the like comprising a strip of bent diagonal
wires (2) and longitudinal (3) wires welded to one another, in which the strip is
bent at angle around a longitudinal wire (4) to form a wire bead having a substantially
L-shaped cross-section with one short leg (5) and one long leg (6), characterized
in that the angle (α) between the short leg (5) and the long leg (6) of the L-shaped
wire bead (1) is greater than 90°.
2. Wire bead (1) according to claim 1 characterized in that the short leg (5) of the
L-shaped wire bead (1) is provided with a plastic sleeve (7).
3. Wire bead according to claim 2 characterized in that the plastic sleeve (7) consists
of a hollow longitudinal profile (8) placed over the short arm (5) of the L-shaped
wire bead (1).
4. Wire bead according to claim 3 characterized in that the hollow longitudinal profile
(8) shows a substantially U-shaped cross-section, the body (9) of the U-shaped longitudinal
profile (8) running almost parallel with the long leg (6) of the L-shaped wire bead
(1).
5. Wire bead according to one or more of the foregoing claims 1 - 4, characterized in
that the plastic sleeve (7) includes longitudinal grooves or protruding ribs (10).
6. Wire bead according to one or more of the foregoing claims 1 - 5, characterized in
that the ratio between width (b) of the long leg (6) and width (a) of the short leg
(5) of the L-shaped wire bead (1) varies between 3 to 5.
7. Wire bead according to one or more of the foregoing claims 1 - 6, characterized in
that the long leg (6) shows a flexure or kink (16).