ANCHOR FOR LAMINATED GLASS AND METHOD FOR SETTING OF THE ANCHOR IN LAMINATED GLASS

Abstract

An anchor for laminated glass includes an expansion dowel that has expansion appendices situated circumferentially, and is preferably made of a flexible material and having a conical cross-section with thickness increasing in the direction of insertion. Above the line of the expansion appendices is a circumferential groove, situated at the height of the edge of transition of the cylindrical hole into the conical hole, forming an empty space.

Claims

1. An anchor for laminated glass, set in a blind cylindrical hole with a conical undercut, in a laminated panel, composed of at least two panels, one of which is a support panel with a cylindrical through-hole with conical undercut abutting a second external glass panel, the anchor having a countersunk cap, onto which a dowel with an expansion anchoring part is placed, wherein the expansion dowel (3) has expansion appendices (5) situated circumferentially, preferably made of a flexible material and having a conical cross-section with thickness increasing in the direction of insertion, while above the line of the expansion appendices (5) a circumferential groove (6) is located, situated at the height of the edge of transition of the cylindrical hole (1) into the conical hole (10), forming an empty space (7).

2. An anchor according to claim 1, wherein an empty space is located (8) between the conical frontal surface of the expansion cap (3) with compressed expansion dowel (4) and the bottom surface of the hole (11).

3. An anchor according to claim 1, wherein between expansion dowel (4) and the surface of the hole (1), a plastic cover (9) is placed, reducing point stress, while the diameter of the expansion cap (3) is larger than the diameter of the expansion dowel (4).

4. An anchor according to claim 1, wherein the diameters of the expansion cap (3) and of the expansion dowel (4) are the same.

5. An anchor according to claim 1, wherein the surface of the expansion appendices (5) is covered with a plastic having a high friction coefficient, preferably nylon or EPDM or polyolefins.

6. An anchor according to claim 1, wherein the angle of the cap's cone (3) is in the range of 110-150.

7. An anchor according to claim 1, wherein the angle between the external surface of the cap's cone (3) and the internal surface of the appendices (5) of the expansion dowel (4) is in the range of 0-30.

8. An anchor according to claim 1, wherein the angle between the internal surface and the external surface of the appendices (5) of the expansion dowel (4) is in the range of 0-20.

9. A method for setting of the anchor in laminated glass, the glass consisting of at least two panels, one of which preferably is a support panel and the other, external onea glass panel, the method consisting in setting the anchor in an undercut hole made in the support panel, which is laminated with the external glass panel so as to the conical undercut of the hole, abuts the other glass panel, wherein in the hole (1) of the support panel (2) a countersunk expansion cap is placed (3) and a dowel (4) is put on it, the dowel having expansion appendices (5) situated on the circumference of the expansion dowel (4), made preferably of a flexible material and having a conical cross-section with thickness increasing in the direction of insertion, and then, the dowel (4) is deformed so as to the expansion appendices (5) in the result of compressive forces contact the conical hole (10) on the cone's surface, beyond the edge connecting the conical surface with the cylindrical surface of the hole (1), increasing the diameter of the hole (1), and the surfaces of the cap (3) and the expansion dowel (4) are located at the same level and in one plane, while the circumferential groove (6) situated above the line of the expansion appendices (5) is located at the height of the edge of transition of the cylindrical hole (1) into the conical hole (10), forming an empty space (7).

10. A method according to claim 9, wherein an empty space forms (8) between the conical frontal surface of the expansion cap (3) with the compressed dowel (4) and the bottom surface of the hole (1).

11. A method according to claim 9, wherein the conical part of the hole (11) is made at an angle of from 40 to 50 in relation to the surface of the support panel (2).

Description

DESCRIPTION OF THE DRAWINGS

[0022] The subject of the invention is illustrated as an embodiment in the drawing, where:

[0023] FIG. 1 shows a cross-section of the anchor set in a two-layer plate of laminated glass;

[0024] FIG. 2a dowel with expansion appendices;

[0025] FIG. 3an expansion cap;

[0026] FIGS. 4-8the method for setting of the anchor in an undercut hole;

[0027] FIG. 9a part of the dowel in the form of expansion appendices with a circumferential groove; and

[0028] FIG. 10deformation of the appendices on a cap.

DESCRIPTION OF DISCLOSED EMBODIMENTS

[0029] In one of embodiments of the invention, a circular anchor is set in a two-layered glass panel in a cylindrical hole 1 with a conical undercut 10.

[0030] In order to set the anchor, at first, the hole 1 with a conical undercut 10 is made in the support panel 2, which is drilled all the way through. The conical part of the hole is made at an angle of from 45 in relation to the surface of the support panel. The glass panels are laminated together so as to the broadened conical part 10 of the hole 1 is connected by the laminate with the second glass panel. A shift between the panels during lamination does not affect the shape of the hole, and subsequent setting of the anchor. Connected and laminated panels form together the blind hole 1 with a conical undercut 10, in which the anchor is set.

[0031] The anchor consists of a countersunk expansion cap 3 and an expansion dowel 4. The angle of the cap's cone is equal to 130. Then, a screw is driven in into the thread of the cap 3 in order to fix the whole structure. The dowel 4 has twelve expansion appendices 5 made of a flexible material and having a conical cross-section with thickness increasing in the direction of insertion. There is a circumferential groove 6 above the line of the expansion appendices 5, the groove being situated at the height of transition of the cylindrical hole 1 into a conical hole 10. The surface of the expansion appendices 5 is covered with a plastic having a high friction coefficient, selected from the group comprising nylon, EPDM and polyolefins. The diameters of the cap 3 and the dowel 4 have the same size. On the other hand, in another embodiment of the invention, a cover 9 made of a plastic reducing point stress is placed between the hole 1 and the anchor, but then, the diameter of the expansion cap 3 is larger than the diameter of the expansion dowel 4.

[0032] Then, a countersunk expansion cap 3 is placed in the hole 1 of the support panel 2. Onto the cap 3, the dowel 4 with the expansion appendices 5 is put and the dowel 4 is deformed so as to the expansion appendices 5 in the result of compressive forces contact the conical hole 10 on the cone's surface, beyond the edge connecting the conical surface with the cylindrical surface of the hole 1, leading to an increase of the diameter of the hole 1. Surfaces of the cap 3 and the expansion dowel 4 are located at the same level and in one plane, and the circumferential groove 6 situated above the line of the expansion appendices 5, is located at the height of the edge of transition of the cylindrical hole 1 into the conical hole 10, forming an empty space 7 in-between. In case when the deformation is carried out properly, surfaces of the cap 3 and the dowel 4 are located at the same level. At the same time, an empty space 8 is formed between the conical frontal surface of the expansion cap 3 with the compressed expansion dowel 4 and the bottom surface of the hole 11.

[0033] The angle between the external surface of the cap's cone 3 and the internal surface of the appendices 5 of the expansion dowel 4 is in the range of 0-30. The obtained difference between the angles is filled with the appendices 5 of the expansion dowel 6. It leaves much more space for deformation of the appendices 5 of the dowel 6 and lower setting of the anchor. Then, the angle between the internal surface and the external surface of the appendices 5 of the expansion dowel 4 is in the range of 0-20. After deformation, the appendices 5 form contact with the material beyond the bend edge between the cylindrical 10 and conical part of the hole 1. Conical shape of the appendices 5 is intended for protection of the cap 3 from sliding off, as a result the cap 3 locks itself in the hole 1, increasing the diameter of the whole anchor. In this way, operation of the anchor consists in transmission of forces onto the material by compression, and not cutting the appendices off.