ES1297506U - Concrete screw (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Screw for concrete, comprising a screw head (1) provided with an attack zone intended to be coupled to a tool, a screw shank (2) with a tapered end (20) and a primary thread (3) defined by axially spaced threads and formed at least partially on the screw shank (2), characterized in that the screw shank (2) includes in its nominal diameter a curved-concave milled portion (5) that is located in a region contiguous to the pointed termination, generating a recess that extends longitudinally free of the primary thread. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

concrete thyme

OBJECT OF THE INVENTION

The purpose of this application is to register a screw for installation in concrete or brick as a base material.

More specifically, the invention proposes the development of a screw to be used in a concrete, brick or similar substrate that has a design that facilitates its installation on the substrate or base material.

BACKGROUND OF THE INVENTION

Concrete screws are well known in the state of the art, which are screwed into holes made in a construction material, in particular concrete, without the need to use an anchor. In this case, the diameter of the hole is greater than the diameter of the core of the screw and less than the outer diameter of the screw with the thread. By means of the aforementioned, the screw is threaded into the construction material when screwing or threading the screw, in order that the thread in the construction material generates a corresponding counter-thread or performs an undercut for the necessary fixing between the thread of the screw and construction material.

However, such screws are of a design that can make them difficult for the operator to install as they may require significant effort to drive into the base material.

In addition, the applicant is not currently aware of an invention that has all the characteristics that are described in this specification.

DESCRIPTION OF THE INVENTION

The present invention has been developed in order to provide a screw for concrete that is configured as a novelty within the field of application and solves the previously mentioned drawbacks, also providing other additional advantages that will be evident from the description that follows.

It is therefore an object of the present invention to provide a screw for concrete, being of the type that comprises a screw head provided with an attack zone designed to engage a tool, a screw shank with a tapered end and a primary thread defined by axially spaced threads and formed at least partially on the screw shank, characterized by the fact that the screw shank includes in its nominal diameter a milled portion that is located in a region adjacent to the termination pointed, generating a recess that extends longitudinally free of the primary thread, in such a way that it generates a cutting edge in the favorable direction of rotation of the screw during its installation. The milled portion is oriented between -10° and 10° with respect to the generatrix of the screw shaft (2).

Thanks to these characteristics, it is possible to improve the installation of the screw since it reduces the effort for the user and allows a faster installation.

It should be noted that this cut or milled portion present in the shank of the screw, since it is not made at the pointed end, facilitates the formation of a thread in the base material, since this milled area causes a discontinuity in the thread, facilitating its formation. , as well as allowing dust and fragments of base material, originated during installation, to be easily dislodged.

Preferably, the primary thread has a plurality of transversal cuts made along it, which allow the breakage of the fragments during the threading process.

Additionally, the screw may include a secondary thread formed by threads axially spaced between the threads of the primary thread, the secondary thread having an outer diameter that is less than the outer diameter defined in the primary thread and less than the nominal diameter of the hole in the base material. The arrangement of the two threads makes it possible to reduce the installation torque during threading and to achieve a better centering of the screw in the previously drilled hole.

Also preferably, the secondary thread has a plurality of transverse cuts made along it.

Advantageously, the pointed termination includes threads of the primary thread and/or secondary thread, which facilitates the insertion of the screw both in concrete and in other types of base materials, such as wood, since the threaded tip facilitates installation in this type of materials when guiding the screw in the hole to be inserted.

According to another aspect of the invention, the head of the screw can include anti-rotation means located on the face facing the screw shank, so as to prevent the screw from loosening once installed in the substrate.

Preferably, the aforementioned anti-rotation means comprise a plurality of recesses distributed radially across the face surface of the head.

The screw described represents, then, an innovative structure with structural and constitutive characteristics unknown up to now for the purpose for which it is intended, reasons that, together with its practical utility, provide it with sufficient grounds to obtain the privilege of exclusivity that is requested.

Other characteristics and advantages of the screw object of the present invention will become evident 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 an elevation and plan view of the screw for concrete according to the present invention;

Figure 2.- Is a partial perspective view of a section of the screw stem; and Figure 3.- Is an enlarged partial elevation view of the screw shank.

DESCRIPTION OF A PREFERRED EMBODIMENT

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

Furthermore, the terms first, second, third and the like in the description and in the claims are used to distinguish between similar items and not necessarily to describe a sequential or chronological order.

Furthermore, the terms top, bottom, top, bottom, and the like in the description and claims are used for descriptive purposes and not necessarily to describe relative positions.

As can be seen in figure 1, the concrete screw comprises a screw head (1) provided with an attack area (10) intended to be attached to a tool, a screw shank (2) with a termination (20) tapered tip and a primary thread (3) defined by axially spaced threads and partially formed on the screw shank (2).

The screw rod (2) includes in its nominal diameter a curved concave milled portion (5) that is located in a region adjacent to the pointed termination (20) and partially encompasses the screw rod (2) that includes a secondary thread ( 4) formed by threads axially spaced between the threads of the primary thread (3), the secondary thread having an outer diameter that is less than the outer diameter defined in the primary thread (3).

It is possible that the screw shank (2) has more milled portions (not shown) along it.

Advantageously, both the primary thread (3) and the secondary thread (4) present a plurality of small transverse cuts (30, 40) spaced from each other and made along the same.

Note that the pointed termination (20) also includes threads of the primary thread (3) and secondary thread (4).

In order to prevent the screw from turning or loosening in an undesired way when it is installed, anti-rotation means are provided, located on the face of the head (1) facing the screw shank (2), which are made up of a plurality of recesses. (6) radially distributed across the face surface of the head (1) (see Figure 1).

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

Claims (8)

1. Screw for concrete, comprising a screw head (1) provided with an attack area designed to be attached to a tool, a screw shank (2) with a tapered tip (20) and a primary thread (3 ) defined by axially spaced threads and formed at least partially on the screw shank (2), characterized in that the screw shank (2) includes in its nominal diameter a curved-concave milled portion (5) that is located in a region contiguous to the pointed termination, generating a recess that extends longitudinally free of the primary thread. Screw for concrete according to claim 1, characterized in that the milled portion is oriented between -10° and 10° with respect to the generatrix of the screw shank (2). Screw for concrete according to any of the preceding claims, characterized in that the primary thread (3) has a plurality of transverse cuts (30) made along it. 4. Screw for concrete according to any of the preceding claims, characterized in that it includes a secondary thread formed by threads axially spaced between the threads of the primary thread (3), the secondary thread having an external diameter different from the diameter outside defined in the primary thread (3). Screw for concrete according to claim 4, characterized in that the secondary thread (4) has a plurality of transverse cuts (40) made along it. Screw for concrete according to any of the preceding claims, characterized in that the pointed end (20) includes threads of the primary thread and/or secondary thread. 7. Screw for concrete according to any of the preceding claims, characterized in that the head includes anti-rotation means located on the face facing the screw shank. Screw for concrete according to claim 7, characterized in that the anti-rotation means comprise a plurality of recesses (6) radially distributed across the surface of the face of the head.