ES1262960U - Expansion anchor (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Expansion anchor comprising a bolt with a threaded section and a section at its front end with a conical shape, an expansion sleeve located in the conical section, the conical end being intended to radially widen the sleeve of expansion when a torque is applied on the bolt in a forward direction inside a hole, a metric threaded nut on the threaded section and a washer, in which the expansion sleeve is formed by a piece provided with a upper section from which a plurality of radially distributed expansion segments extend below each other, and an opening defined by a joint length, being arranged longitudinally along the entire height of the expansion sleeve, characterized by the fact that the joint length of the opening has the relation: B/W between 2.3 and 3.2 where B is the height of the expansion sleeve and W is the height of the upper section of the expansion sleeve, and in which the relationship between the total length of the expansion sleeve and the width of each expansion segment meets the relationship A/K> 3.4; where A is the total length of the expansion sleeve and K is the width of each expansion segment, and wherein the bolt and expansion sleeve are made of different materials, the bolt being made of galvanized steel material while the expansion sleeve is made of steel with a sherardized coating. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

Expansion anchor

OBJECT OF THE INVENTION

The object of the present application is the registration of an expansion anchor.

More specifically, the invention proposes the development of an expansion anchor whose purpose is to fix the loads applied to an element to be fixed to a base material, being suitable for concrete with or without the presence of cracks.

BACKGROUND OF THE INVENTION

Expansion anchors used to fix an anchor plate on a concrete or similar type base material are well known, where the anchors are inserted into blind holes previously made in the base material and pass through holes provided in the base plate. anchorage.

A known type of expansion anchor is one that comprises a bolt with a threaded section and a recessed section at its front end with a conical shape, an expansion sleeve located in the conical section, the conical end being provided to radially widening the expansion sleeve when a torque is applied on the bolt in a forward direction inside a hole, a metric threaded nut on the threaded section and a washer. The expansion sleeve may be essentially one-piece provided with multiple radially distributed expansion segments and an opening arranged longitudinally along the entire height of the expansion sleeve. During the installation of the expansion anchor, the expansion sleeve is fixed in the base material.

However, in practice, the expansion anchors available on the market are suitable to be applied on a specific base, that is, there are anchors for concrete with cracks and anchors for uncracked concrete, which implies having a variety of anchors and It is not always possible to appreciate the existence or not of cracks inside the base, so an anchor may be placed that is not entirely suitable for that base. In addition, usually, the bolt and the expansion sleeve are made of the same material and the same coating, which can cause cold welding between both components, during their installation due to the pressure exerted between the expansion sleeve and the base material. , which prevents its post-expansion in the presence of cracks in the concrete and therefore its unsuitability for use in cracked concrete.

Furthermore, the applicant is not currently aware of an invention that has all the features described in this specification.

DESCRIPTION OF THE INVENTION

The present invention has been developed in order to provide an expansion anchor that is configured as a novelty within the field of application and solves the aforementioned drawbacks, also providing other additional advantages that will be evident from the description that follows. accompany below.

It is therefore an object of the present invention to provide an expansion anchor of the type comprising a bolt with a threaded section and a section at its front end with a conical shape, an expansion sleeve located in the section of a conical shape, being the conical end provided to radially widen the expansion sleeve when a torque is applied on the bolt in a forward direction inside a hole, a metric threaded nut on the threaded section and a washer, in which the expansion sleeve is made up of a piece provided with three radially distributed expansion segments and an opening arranged longitudinally along the entire height of the expansion sleeve.

In particular, the invention is characterized in that the joint length of the opening has the relationship:

B / W between 2.3 and 3.2

where B is the height of the expansion sleeve and W is the height of the upper section of the expansion sleeve,

and wherein the ratio between the total length of the expansion sleeve and the width of each expansion segment meets the ratio A / K> 3.4;

where A is the total length of the expansion sleeve and K is the width of each expansion segment.

Furthermore, the invention is characterized in that the bolt and the expansion sleeve are made of different materials, the bolt being made of galvanized steel material while the expansion sleeve is made of steel with a sherardized coating.

According to another aspect of the invention, the inner face of each of the expansion segments has at its lower end a chamfer with an angle with respect to the longitudinal axis of the bolt between 7 ° and 10 °.

Thanks to these characteristics, an expansion anchor is obtained that can be applied to bases with cracked or uncracked concrete. That is, this anchoring with the particulars set out above can be ideally applied to concrete with or without cracks. The use of different coatings for the bolt and expansion sleeve prevents cold welding between the two components, which could hinder their subsequent expansion.

The expansion anchor described thus represents an innovative structure with structural and constitutive characteristics hitherto unknown for the purpose for which it is intended, reasons that, together with its practical utility, provide it with a sufficient basis to obtain the privilege of exclusivity that is requested. .

Other characteristics and advantages of the expansion anchor object of the present invention will be apparent from the description of a preferred, but not exclusive, embodiment, which is illustrated by way of non-limiting example in the accompanying drawings, in which:

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1.- Is a front perspective view of the expansion anchor according to the present invention;

Figure 2.- Is a rear perspective view of the expansion anchor according to the invention;

Figure 3.- Is a side elevation view of the expansion anchor represented in Figures 1 and 2;

Figure 4.- Is a front elevation view of the development of the expansion sleeve before being folded; Y

Figure 5.- Is a side elevation view of the development of the expansion sleeve shown in Figure 4.

DESCRIPTION OF A PREFERRED EMBODIMENT

In view of the aforementioned figures and, in accordance with the numbering adopted, an example of a preferred embodiment of the invention can be seen in them, which comprises the parts and elements that are indicated and described in detail below.

As can be seen in Figures 1 to 3, the expansion anchor comprising a bolt (1) with a threaded section (10) and a section at its front end with a conical shape (11), an expansion sleeve (2) located in the conical-shaped section (11), the conical-shaped end (11) being intended to radially widen the expansion sleeve (2) when a torque is applied on the bolt in a direction of advance inside the a hole drilled in a base material (not shown). In addition, a metric threaded nut (3) is provided in the threaded section (10) of the bolt (1), as well as a washer (4) located below the metric threaded nut (3).

With particular reference to the expansion sleeve (2), it is made up of a piece provided with an upper section (20) from which a plurality of expansion segments (21) extend below that are radially distributed and spaced from each other, and an opening (see figure 1) which is defined by a joint length, being arranged longitudinally along the entire height of the expansion sleeve (2).

It should be mentioned that this anchor meets a series of specific characteristics, such as the fact that the joint length of the opening of the expansion sleeve (2) has the following relationship:

B / W between 2.3 and 3.2

where (B) is the height of the expansion sleeve and (W) is the height of the upper section (20) of the expansion sleeve (2).

Furthermore, on the other hand, the relationship between the total length of the expansion sleeve and the width of each expansion segment fulfills the relationship A / K> 3.4, where (A) is the total length of the expansion sleeve and ( K) the width of each expansion segment.

The bolt (1) and the expansion sleeve (2) are made with different coatings, more specifically the bolt (1) being made of galvanized steel material while the expansion sleeve (2) is made of steel with a sherardized coating. .

Sherardization consists of covering the pieces of steel deposited by diffusion with a protective layer of zinc by simultaneously heating the pieces with zinc powder at a temperature of 320 to 500 ° C.

With reference to the aforementioned expansion segments (21), they present a shoulder (22) of reduced dimensions that protrudes from the outer face and the upper part (20) includes protrusions (23) aligned with each of the expansion segments. (twenty-one).

As can be seen in figure 5, the inner face of each of the three expansion segments (21) has at its lower end a chamfer with an angle of inclination (Z) with respect to the longitudinal axis of the bolt (1) that It is in a range between 7 ° and 10 °.

During the installation of the expansion anchor, when the user or operator applies a specific installation torque, the bolt moves axially inside the hole of the base material when the metric nut is screwed, causing the cone-shaped section to become move upward, causing the expansion sleeve to expand, opening until it comes into contact with the inner wall of the hole and is firmly attached to it.

The details, shapes, dimensions and other accessory elements used in the manufacture of the expansion anchor of the invention may be conveniently replaced by others that do not depart from the scope defined by the claims included below.

Claims (3)

1. Expansion anchor comprising a bolt with a threaded section and a section at its front end with a conical shape, an expansion sleeve located in the conical section, the conical end being intended to radially widen the sleeve of expansion when a torque is applied on the bolt in a forward direction inside a hole, a metric threaded nut in the threaded section and a washer, in which the expansion sleeve is formed by a piece provided with a upper section from which a plurality of expansion segments distributed radially and spaced apart from each other extend below, and an opening defined by a joint length, being arranged longitudinally along the entire height of the expansion sleeve, characterized by the fact that the joint length of the opening has the relation: B / W between 2.3 and 3.2 where B is the height of the expansion sleeve and W is the height of the upper section of the expansion sleeve, and wherein the ratio between the total length of the expansion sleeve and the width of each expansion segment meets the ratio A / K> 3.4; where A is the total length of the expansion sleeve and K is the width of each expansion segment, and wherein the bolt and the expansion sleeve are made of different materials, the bolt being made of galvanized steel material while the expansion sleeve is made of steel with a sherardized coating. 2. Expansion anchor according to claim 1, characterized in that the inner face of each of the expansion segments has at its lower end a chamfer with an angle with respect to the longitudinal axis of the bolt comprised within a range of between 7 ° and 10 °. 3. Expansion anchor according to claim 1, characterized in that each of the expansion segments has a projection that protrudes from the outer face.