ES2345864A1 - Flat head screw antigiro. (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Flat head screw, for joints of wood and related materials with any other, which, in addition to joining by means of the corresponding nut set, can be flush with the surface of the material without the need of any tool and without effecting countersinking, thanks to the structure of its head and the wedges that make it prevent the rotation of the latter during the process of tightening its nut. (Machine-translation by Google Translate, not legally binding)

Description

Flat head anti-rotation screw.

Technical sector

This innovation is aimed at the sectors of Tools, hardware and DIY.

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State of the art

In the market, there have been some TRCC screws (square neck) that have the same function; joining pieces of wood using nuts and preventing the rotation of the bolt when threading the nut. But given the convex shape of his head, they do not make up with the surface and also need to be hit strongly, especially if the wood is hard, so that the square located under the head is stuck in it and prevents the turn.

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Explanation

Although, the current market seems to be saturated with products that solve the problem of joining safely (although reversibly), wood or related materials, we have detected a vacuum; when what is needed is a union by screw with thread and nut, but whose head is not protrudes from the surface of the materials to be assembled. Our Screw models fill that void, in an original way, simple and practical, also avoiding some of the operations necessarily necessary with the existing screws in the market, as they are; countersinking, use of screwdriver or wrench (as a fixation to prevent screw rotation when tightening the nut) and the use of the hammer.

Our models improve substantially These functions, including aesthetics.

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Model 1- It is a screw or bolt standardized thread, with its corresponding nut and whose innovation It is given by the configuration of your head. This one has two peculiarities;

1st, on the top it is smooth (it does not have slot or slit for the tip coupling screwdriver or screw bit) and completely flat, to be able to make up with the surface to join and is shaped like a polygon crashed (1.3); with a variable number of sides (we have used the six, because the hexagon is the most common way among used in hardware, but can have, from three onwards), Y

2nd, of the vertices of the star head the nerves / wedge (1.1) that join the body (1.2) and that arise they perform the function of penetration and fixation of the bolt on the support.

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Model 2- It also has two peculiarities;

1st- As in version 1, the head of the screw on the top is smooth (2.3) to make up to level with the surface to be joined (it has no groove or slit for the screwdriver tip coupling or screw bit) and completely flat although, in this case, the shape can be circular. The thickness of the head will be reduced proportionally to the size of the bolt and its edge, it is beveled along the entire perimeter (2.2) and oriented towards the central axis, to facilitate the penetration and fixation on the surface of the material, and

2nd- On the underside of his head, he has one or more wedge-shaped projections (2.1 and 2.2) or "tooth", oriented radially from that, to the body of the screw and with the sharpest angle or edge facing down.

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With the current screws, when we need join two wooden surfaces, but the union must be done with screw and thread, and on the face where the screw goes, it must make up with the screwed surface (or we want it to be so,) is mandatory, in addition to the previous drilling of the materials has to join (of a diameter slightly larger than the bolt to be used), the countersunk, whose function is to "hide" the head of the screw in the surface of the material so that it does not stand out so you have to expand the through hole in its beginning. With our innovation, this operation is eliminated, since the structure of the head of the Screw, besides being flat and smooth, has the nerves / wedge that will introduce into the wood with a small pressure (even manual, depending on the type of wood), and they will end up sinking and make up to the material with the force exerted when threading the nut on the opposite side of the joint.

We also avoid the current need to block the screw (with conical, square, hexagonal heads, etc.) with the screwdriver or the wrench to prevent its rotation when we tighten the nut on the opposite side, since the rotation of the latter is prevented by its fixation with the nerves / wedges. Likewise, the Hammered, mandatory with current screws (TRCC).

So we dispense with operations, now necessary, in this type of fixings; countersinking, blocking of the screw during tightening or hammering for fixing (with the consequent saving of time).

Description of the drawings

Figure 1 shows views of plants and the elevation and perspective of model A.

1.1-

Bottom view plant: nerve / wedge.

1.2-

Elevation: body.

1.3-

Plant top view: head.

1.4-

Perspective.

Figure 2 shows us views of plants, the elevation and perspective of model B.

2.1-

Bottom view plant: nerve / wedge.

2.2-

Elevation: body.

2.3-

Plant top view: head.

2.4-

Perspective.

Embodiment

The manufacture of tortilleria requires the realization of a matrix for each screw model / size. A Once completed, any stamping and machining professional of threads can carry out the project, without any problem, given standardized mechanization, for this type of parts, at the level international.

Industrial application

In the metal industry, the machining of pieces by stamping, you can perform the project perfectly with specialized machinery (presses). Its thread admits all variants of this international type (ISO); normal or fine metric, witworth, unified, etc. and their corresponding nuts and washers, like all standard or special measures of diameter and length Its heat treatment (tempered) and tempering (elasticity) will provide the screws with their characteristics to can adapt to your needs (tightening torque) which ends with the finishing and protection processes, according to material and destination (galvanized, chrome, etc.).

Claims (3)

1. Screw for joints of wood and related materials, comprising a head and a threaded rod, characterized in that it has a head whose flat and smooth upper part, without any indentation or notch, and whose lower part has at least one wedge that starting of the periphery of the head, it has a sharp part and oriented downwards and joined the rod, in order to avoid its rotation during the tightening operation of the complementary nut and power, thus, being flush with the surface of the material without the need of make a previous countersink. 2. Screw for joints of wood and related materials which, according to claim 1, characterized in that the head is in the form of a regular or crashed polygon, and because the sharp part of each wedge joins each vertex of the polygon with the stem 3. Screw for joints of wood and related materials, according to claim 1, characterized in that the head has a circular shape and a beveled edge along its entire periphery, from which the sharp part of each wedge arises.