BG65071B1 - Nail - Google Patents

Abstract

The nail is used for making higher strength wood jointing characteristics. It comprises a head (1) and square-screw body (2) of cross section formed by the section of a square (3) and circle (4) in such a way in order to form screw-type cylindrical surfaces (5) and screw linear surfaces (6) of periodically repeated grooves (7), with a specific pitch, perpendicular to the axis of the nail pr the screw generatrix line, having lateral profile of a triangle with hypotenuse (8), section of the generatrix of the screw surfaces and legs (9 and 10), sections for intercrossing lines and forming sharp angles with the hypotenuse, the smaller one the side of head (1) of the nail.

Description

Technical field

The invention relates to a nail, which can be used for the indiscriminate connection of wood elements.

BACKGROUND OF THE INVENTION

A nail [1,2] is known with a square-screw cross-sectional body described by the intersection of a square and a circle such that the angles of the square are cut off and arcuate sections of a certain width are formed. The nail does not provide sufficiently high values of the force required for its removal, which predetermines the insufficient strength of connection of the assembled elements.

A known nail [3, 4] with a rotating body and rotating channels with a definite pitch rotating axial triangle formed by a hypotenuse, which is a segment of the rotating body forming part and catheters - part of two intersecting hypotenuse intersecting lines, is known , the smaller angle being from the nail head. This construction provides increased force for removing the nail from the wood workpiece, but does not impede the rotation of the assembled elements.

Also known is a construction of nails with a rotary body [5], on which are formed by a certain step rotary channels with an axial profile triangle formed by a hypotenuse, which is a segment of the rotating body forming and the cathets - part of two intersecting lines, concluding with hypotenuse angles, with the smaller angle at the nail head. Screw grooves are also formed on the rotary body, which increases the resistance against rotation of the parts of the realized assembly. The construction of the body is non-technological, since it is initially shaped like a cylinder, on which the rotary and screw channels are subsequently rolled.

SUMMARY OF THE INVENTION

It is an object of the invention to provide a technological design of nails by which connections of elements of wood are realized, which have increased resistance both when rotating the assembled parts and when removing the nail.

The task is solved by creating a nail comprising a head and a square-screw body is a cross-section described by the intersection of a square and a circle so as to form four screw cylindrical surfaces and screw linear surfaces with periodically repeating stepwise repeating steps . They are perpendicular to the axis of the nail or screw line forming grooves having a transverse triangular profile with the hypotenuse, a section of the forming of the screw surfaces and Cate, segments of intersecting lines and forming a hypotenuse acute angles alpha and alpha ₂ as the less is side of the nail head.

The main advantages of the nail are the manufacturability of the structure, since the cross-section, the ruler screw surfaces and the grooves of the body are formed simultaneously and that it enables the assembly of elements of wood with high strength characteristics.

Explanation of the annexed figures

An exemplary embodiment of a nail is shown in the figures, of which:

Figure 1 is a general view of a nail;

Figure 2 is a cross-sectional view of the body; Figure 3 is a cross-section of the channels.

An embodiment of the invention

The nail is constructed of a head 1 and a square-screw body 2 with a cross-section, described by the intersection of square 3 and circle 4, so as to form four screw stripes 5, forming part of a common cylindrical surface and four linear screw surfaces 6 of which periodically repeating steps P are formed, perpendicular to the axis of the nail or to the screw forming the grooved surface of the channels 7 with a transverse triangular profile with hypotenuse 8, which is a segment belonging to the corresponding linear screw surface. and catheters 9 and 10 concluding acute angles alpha] and alpha ^ with the hypotenuse, the smaller being on the side of Chapter 1 of the nail.

Claims (3)

Claims A nail comprising a body, head and pointing as a regular quadrangular pyramid apex, characterized in that the body (2) is square-screw and has a cross-section described by the intersection of a square (3) and a circle (4) so to form four screw bands (5) forming part of a common cylindrical surface and four linear screw surfaces (6) on which periodically repeating P-grooves (7) are formed. A nail according to claim 1, characterized in that the grooves (7) are perpendicular to the nail axis or to the screw forming the ruler surfaces (6). A nail according to claims 1 and 2, characterized in that the grooves (7) have a transverse triangular profile with hypotenuse (8), which is a section belonging to the corresponding linear screw surface and catheters (9 and 10) having the hypotenuse sharp angles alpha] and alpha ₂ , the smaller being on the side of the 5 head (1) of the nail.