SK10100Y1 - Dowel, especially for thermal insulation - Google Patents

Abstract

A dowel (1) has a housing (2) suitable for being inserted into a hole (8, 80) in a wall and is provided with holding unit (A) suitable for holding the housing in the hole in the wall, and a screw (3) suitable for being screwed into the housing (2) so as to cause an expansion of the holding unit (A) to efect a firm hold of the dowel in the hole of the wall; the housing (2) is composed of a first portion (4) and a second portion (5) that is adapted to be slidably mounted in the first portion (4) to adjust the length of the dowel (1); and the dowel (1) is further provided with anti-rotation device (B) suitable for preventing a rotation of the second portion (5) relative to the first portion (4) of the housing of the dowel.

Description

The field of technology

The presented technical solution relates to a wall anchor, in particular for attaching a thermal jacket to the wall of a building to obtain a thermal insulation jacket.

Wall anchors suitable for wall mounting are known. The anchor includes a cylindrical body with expandable ribs suitable for placement in a hole in the wall, and a screw that is screwed into the body of the anchor so as to expand the ribs, which open in the hole in the wall and firmly hold the wall anchor.

Current state of the art

However, as is known, wall anchors are primarily intended for solid walls (concrete walls, solid brick walls, etc.). This results in poor attachment of the wall anchor in walls made of perforated bricks or friable materials such as plasterboard, fiber cement board, fiber reinforced plasterboard, etc.

Anchors according to the prior art have some disadvantages, which mainly result from the fact that the different thickness of the insulation panels of the thermal jacket forces the seller to stock a relatively large number of anchors with bodies with expandable ribs of different lengths.

In addition, the excessive length of the anchor body results in problems with relatively high costs for packaging and storage.

The essence of the technical solution

The aim of this technical solution is to provide an anchor that does not have the mentioned disadvantages and is simple and cheap to manufacture.

Another goal is to provide such an effective, reliable anchor, which is particularly suitable for achieving clamping even in the case of walls made of perforated bricks or panels of friable materials.

Yet another goal is to provide such an anchor that is versatile and suitable for use on different thicknesses of the thermal jacket.

These objectives will be achieved according to a technical solution with characteristics where the wall anchor comprises a body adapted to be inserted into a hole in the wall and equipped with retaining means adapted to hold the body in the wall opening and a screw for screwing into the body to expand the retaining means to tightly clamp the anchor inside hole in the wall, wherein the body includes a first portion and a second portion for sliding assembly into the first portion for adjusting the length of the anchor, and the anchor further includes anti-rotation means adapted to prevent rotation of the second portion relative to the first portion of the anchor body.

Preferably, the anti-rotation means comprise a grooved connection between the first part and the second part of the body.

Preferably, the first part of the body includes a sleeve with an axial channel and the second part of the body includes a shaft having an axial channel for receiving the screw and a head for sliding in the axial channel of the sleeve, the axial channel of the first part of the body having a polygonal cross-section and the head of the shaft having a polygonal circumference, and anti-rotation means include the head of the shaft engaged in the axial channel of the first part of the body.

Preferably, the axial channel of the first part of the body has an octagonal cross-section and the stem head has an octagonal circumference.

Furthermore, preferably, the first part of the body includes a shaft extending axially from the other end of the sleeve, the shaft having a smaller diameter than the sleeve and the axial channel of the sleeve ends at an internal collar on the shaft, which acts as a stop surface for said head of the shaft.

Further, the first body portion includes a disc-shaped head radially protruding from the first end of the sleeve.

Preferably, the head of the first body part has a number of holes.

Preferably, the first part of the body contains longitudinal ribs.

Preferably, the stem of the first part of the body has longitudinal grooves ending in the radial holes of the second end of the sleeve.

Preferably, the retaining means are arranged in said shaft of the second part of the body.

Further preferably, the retaining means comprise longitudinal ribs of a corrugated type, which are suitable for corrugation when the screw is screwed into the axial channel of the stem (50) of the second body part.

Further preferably, the longitudinal ribs of the stem of the second body part are arranged between the longitudinal grooves and are interconnected by an end block arranged at one end of the stem of the second body part.

Advantageously, the longitudinal ribs of the stem of the second part of the body have ribs arranged as threads.

Preferably, the anchor further includes a clip suitable for use in the saddle, subsequently formed behind the axial channel of the first part of the body.

Further preferably, the anchor includes a disc-shaped head radially protruding from the first end of the socket, a stop surface for the clip, which is arranged in the axial channel so as to block the clip in the seat, the rear surface of the clip being flush with the rear surface of the head.

Overview of images on drawings

Other features of the technical solution will be clearer from the detailed description that follows, with reference to the purely illustrative and therefore non-limiting embodiments shown in the attached drawings, where:

fig. 1 is an exploded perspective view of the anchor according to the presented solution;

fig. 2 is a top view of the first part of the wall anchor body;

fig. 3 is a top perspective view of a second, partially interrupted portion of the anchor body;

fig. 4 is a perspective view of the anchor body in the assembled state before the screw is screwed into the body;

fig. 5 is an axial cross-sectional view of the body of the wall anchor in the assembled state after the screw has been screwed into the body of the wall anchor and after the ribs of the body have been twisted;

fig. 6 is an exploded perspective view of a wall anchor and thermal coating to be applied to a perforated brick wall;

fig. 7 is a perspective view of the anchor body in the assembled state and of the hole formed in the thermal jacket applied to the wall of FIG. 6;

fig. 8 is a horizontal cross-sectional view of the anchor attached to the thermal jacket and the wall of FIG. 7.

Implementation examples

With the help of pictures, the anchor is described according to the utility model, which is marked with reference number 1.

Now referring to FIG. 1 anchor 1 contains a body 2 suitable for placement in a hole in the wall and a screw 3 for screwing into body 2.

The body 2 has retaining means A, when the screw 3 is screwed into the body 2, the retaining means A will expand, ensuring that the anchor is fixed in the hole in the wall.

The body 2 comprises a first part 4 and a second part 5. The first part 4 and the second part 5 of the body 2 are two separate elements that can be joined together. The second part 5 can be slidably mounted into the first part 4 so that the length of the anchor is adjusted according to the thickness of the wall where the anchor is to be applied.

Anti-rotation means B are provided to prevent rotation of the second part 5 with respect to the first part 4 of the body 2 of the anchor.

The first part 4 contains a sleeve 40 of cylindrical shape with an axial channel 41 open at both ends.

With reference also to fig. 2, the axial channel 41 of the sleeve 40 does not have a cylindrical shape, but a polygonal shape in cross-section. The term "polygonal shape" means either a regular polygon, or an irregular polygon, or a grooved profile, such as e.g. perimeter with grooves and/or ribs. The axial channel 41 preferably has an octagonal shape.

The first part 4 includes a disc-shaped head 42 which radially protrudes from the first end of the sleeve 40 and is positioned against the outer surface of the wall. The head 42 has a number of holes 43 having a different shape, such as a circular or triangular shape, to have a greater adhesion to the wall surface and to facilitate the leveling of the wall.

The first part 4 includes a stem 44 which extends axially from the other end of the sleeve 40 in the opposite direction with respect to the head 42. The stem 44 has a smaller diameter than the sleeve 40.

Both the sleeve 40 and the stem 44 can be equipped with longitudinal ribs 45 to prevent the first part 4 of the body 2 from rotating in the opening of the thermal jacket.

The stem 44 has longitudinal grooves 46 ending in radial holes 47 at the other end of the sleeve 40.

As shown in fig. 2, the axial channel 41 of the sleeve 40 ends at the inner ring 48 on the stem 44. The inner ring 48 acts as a stop surface for the second part 5 of the body 2. The stem 44 has an axial channel 49 of a polygonal shape, e.g. cross-shaped.

With reference to fig. 1, the second part 5 of the body 2 includes a stem 50, which has an inner hollow cylindrical shape with an axial channel 51. The outer diameter of the stem 50 is smaller than the inner diameter of the channel 49 of the stem 44 of the first part 4 of the body, so that the stem 50 can be inserted into the axial channel 51 of the first part 4 of the body 2, intersecting the axial channel of the channel 49 of the shaft 44 of the first part 4 of the body 2.

The stem 50 of the second part 5 is provided with retaining means A. Said retaining means A are obtained by means of a plurality of longitudinal grooves 52 in the stem 50 which define longitudinal ribs 53 between the longitudinal grooves 52. As an example, four longitudinal ribs 53 may be provided. Each longitudinal rib 53 it has ribs arranged like threads.

The longitudinal ribs 53 are connected by an end block 54 arranged at one end of the stem 50 of the second part 5 of the body 2. In this way, the longitudinal ribs 53 are not typical collapsible ribs of a collapsible anchor according to the prior art, but are wavy type ribs. When the screw 3 is screwed into the axial channel 51 of the second part 5 of the body 2 and the tip of the screw pierces the end block 54, the longitudinal ribs 53 do not open radially in a uniform manner and tend to twist, i.e. j. be spirally twisted to form a ring around the shaft 50 of the second part 5 of the body 2.

The second part 5 of the body 2 includes a head 55 which projects radially outwards from the shaft 50.

The head 55 of the second part 5 of the body 2 has a polygonal circumference that is complementary to the circumference of the axial channel 41 of the sleeve 40 of the first part 4 of the body 2 to prevent rotation of the first part 4 with respect to the second part 5 of the body 2.

Therefore, anti-rotation means B include the head 55 of the second part 5 of the body 2, which engages with the axial channel 41 of the sleeve 40 of the first part 4 of the body 2.

Screw 3 is a traditional 30-head threaded screw with a hole or slot for a screwdriver tip.

The anchor 1 also includes a clip 9 suitable for fitting in the seat 12 formed in the head 42 behind the axial channel 41. In this case, a stop surface 11 on the clip 9 is formed in the axial channel 41. The polygonal shape of the axial channel 41 extends in front of the stop surface 11. The seat 12 of the head 42 has a sufficient diameter to insert the stem 50 of the second part 5.

The clip 9 is made of heat-insulating material such as plastic. The plug 7 is made of thermally conductive material and is intended to prevent the anchor 1 from creating a thermal bridge between the outside and the inside of the building, thereby disrupting the thermal insulation.

The stop surface 11 of the seat 12 of the head 42 is made in such a way that the rear surface of the clip 9 is flush with the rear surface of the head 42. The clip 9 thus enables perfect alignment of the coated wall.

As shown in fig. 4 and 5, the stem 50 of the second part 5 of the body 2 is inserted from behind into the axial channel 41 of the sleeve 40 of the first part 4 of the body 2 and into the axial channel 49 of the stem 44 of the first part 4 of the body 2, so that the longitudinal ribs 53 of the stem 50 protrude from the outside of the first part 4 of the body 2. The head 55 of the second part 5 of the body 2 is inserted into the axial channel 41 of the sleeve 40, thereby preventing mutual rotation between the first part 4 of the body 2 and the second part 5 of the body 2. The head 55 of the second part 5 of the body 2 remains in the axial channel 41 of the sleeve 40.

fig. 5 shows the situation in which the anchor 1 is set to its maximum length, i.e. j. the head 55 of the second part 5 of the body 2 is set against the inner ring 48 of the first part 4 of the body 2.

At this point, the screw 3 can be later inserted into the second part 5 of the body 2 and screwed into the second part 5 of the body 2 so as to cause the longitudinal ribs 53 of the stem 50 of the second part 5 of the body 2 to twist. It is clear that the screw 3 can be prearranged in of the second part 5 of the body 2, while the longitudinal ribs 53 would not be twisted. Then the second part 5 of the body 2 with the screw 3 is inserted into the first part 4 of the body 2 so that the longitudinal ribs 53 protrude from the first part 4 of the body 2 and finally the screw 3 is screwed so as to twist the longitudinal ribs 53 as shown in fig. 5.

With reference to fig. 6, the anchor 1 is shown in the case of fixing the thermal jacket 6 to the wall 7, the wall 7 comprising perforated bricks 70 having a number of channels 71 parallel to each other. As is well known, the thermal jacket 6 may contain a panel made of foam material, possibly of a multilayer type.

With reference to fig. 7, the thermal jacket 6 is placed on the wall 7 and a hole 8 is drilled into the thermal jacket, for example using a drill or the like. The opening 8 passes through the thermal jacket and reaches up to the wall 7.

With reference to fig. 8 it can be seen that the hole 8 formed in the thermal jacket continues with the hole 80 formed in the perforated brick 70 of the wall in connection with the channel 71 of the perforated brick.

The anchor 1 is inserted into the opening 8 of the thermal jacket so that the head 42 of the first part 4 of the body 2 comes into contact with the outer surface of the thermal jacket 6. The longitudinal ribs 53 of the stem 50 of the second part 5 of the anchor penetrate through the opening 80 of the perforated brick 70 and are arranged in the channel 71 perforated brick 70.

Now the operator can tighten the screw 3 by acting the tool on the screw head 30 arranged inside the axial channel 41 of the first part 4 of the body 2. This causes the ribs 53 to curl inside the channel 71 of the perforated brick and the curled ribs 53 form a collar that stops against the wall of the perforated brick around the hole 80 of the perforated brick, which results in a firm attachment of the anchor to the perforated brick.

It should be noted that the grooved connection between the head 55 of the second part 5 of the body 2 and the axial channel 41 of the first part 4 of the body 2 prevents mutual rotation between the first part 4 of the body 2 and the second part 5 of the body 2.

Finally, the operator inserts the clip 9 into the seat 12 of the head 42 and performs an alignment operation 70 on the thermal 5 jacket 6.

Equivalent variations and modifications within the reach of a person skilled in the art can be made to the submitted embodiments of the technical solution, while still falling within the scope of the technical solution as expressed in the appended claims.

Claims (15)

CLAIMS FOR PROTECTION 1. Wall anchor (1), in particular for a thermal jacket, comprising a body (2) for insertion into a hole (8, 80) in the wall and equipped with retaining means (A) for holding the body (2) in the hole (8, 80) in the wall, a screw (3) for screwing into the body (2) for expanding the retaining means (A) for firmly clamping the anchor (1) inside the hole in the wall, characterized in that the body (2) comprises a first part (4) and a second part (5) for sliding assembly into the first part (4) for adjusting the length of the anchor (1) and further includes means (B) for preventing the rotation of the second part (5) with respect to the first part (4) of the body (2). 2. Anchor (1) according to claim 1, characterized in that the means (B) for preventing rotation comprise a grooved connection between the first part (4) and the second part (5) of the body (2). 3. Anchor (1) according to claims 1 or 2, characterized in that the first part (4) of the body (2) contains a sleeve (40) with an axial channel (41) and the second part (5) of the body (2) contains a stem ( 50) having an axial channel (51) for accommodating the screw (3) and a head (55) adapted to slide in the axial channel (41) of the sleeve (40), wherein the axial channel (41) of the first part (4) of the body (2) has a polygonal the cross-section and head (55) of the shaft (50) has a polygonal circumference, and the anti-rotation means (B) comprise the head (55) of the shaft (50) engaged in the axial channel (41) of the first part (4) of the body (2). 4. Anchor (1) according to claim 3, characterized in that the axial channel (41) of the first part (4) of the body (2) has an octagonal cross-section and the head (55) of the stem (50) has an octagonal circumference. 5. Anchor (1) according to claims 3 or 4, characterized in that the first part (4) of the body (2) contains a stem (44) extending axially from the other end of the sleeve (40), while the stem (44) has a smaller diameter than the sleeve (40) and the axial channel (41) of the sleeve (40) terminate at an inner collar (48) on the shaft (44), to form a stop surface on the head (55) of the shaft (50). 6. An anchor (1) according to any one of claims 3 to 5, characterized in that the first part (4) of the body (2) comprises a disc-shaped head (42) radially protruding from the first end of the sleeve (40). 7. Anchor (1) according to claim 6, characterized in that the head (42) of the first part (4) of the body (2) has a number of holes (43). 8. Anchor (1) according to any one of claims 3 to 7, characterized in that the first part (4) of the body (2) contains longitudinal ribs (45). 9. Anchor (1) according to any one of claims 5 to 8, characterized in that the stem (44) of the first part (4) of the body (2) has longitudinal grooves (46) ending in the radial holes (47) of the second end of the sleeve (40) ). 10. Anchor (1) according to any one of claims 3 to 9, characterized in that the retaining means (A) are located in the stem (50) of the second part (5) of the body (2). 11. The anchor (1) according to claim 10, characterized in that the retaining means (A) comprise longitudinal ribs (53) of a wavy type to create undulations when the screw (3) is screwed into the axial channel (51) of the shaft (50) of the second part (5) bodies (2). 12. Anchor (1) according to claim 11, characterized in that the longitudinal ribs (53) of the shaft (50) of the second part (5) of the body (2) are located between the longitudinal grooves (52) and are mutually connected by the end block (54) arranged at one end of the stem (50) of the second part (5) of the body (2). 13. Anchor (1) according to claim 12, characterized in that the longitudinal ribs (53) of the shaft (50) of the second part (5) of the body (2) have ribs arranged as threads. 14. Anchor (1) according to any one of claims 3 to 13, characterized in that the anchor (1) further comprises a clip (9) for insertion in the seat (12) subsequently formed behind the axial channel (41). 15. Anchor (1) according to claim 14, characterized in that the anchor (1) includes a disk-shaped head (42) radially protruding from the first end of the sleeve (40), a stop surface (11) on the clip (9), which is arranged in the axial channel (41) to lock the clip (9) in the saddle (12), the rear surface of the clip (9) being flush with the rear surface of the head (42).