SE526155C2 - Rivet heads and rivets - Google Patents

Abstract

Rivet head (3) arranged to be supported by and to connect to a rivet shank (4) and comprising an upper portion (5) to which a deforming force is intended to be applied and a lower portion (6) from which said rivet shank is intended to extend, the rivet (2) thus arranged being intended to join together at least two components. A particular distinguishing feature is that substantially the whole underside of the rivet head has a shape such that friction forces relative to a relevant component are small during a riveting process, with the object of preventing damage to the surface of said component. The invention also relates to a rivet.

Description

P25 30 526 155 2 of the rivet head, as this abuts against the surface coating under high pressure and radial material displacement.

This is particularly serious in the first-mentioned type of rivets, in which there is a relatively pointed peripheral edge. Although in the second type of rivets an attempt has been made to mitigate this effect through a peripheral chamfer, there is a substantially flat contact surface forming large radial friction skis on the surface coating.

Damage to the surface coating is of course bad and can cause corrosion of said components.

SUMMARY OF THE INVENTION The object of the present invention is to provide a rivet head, which eliminates the problems associated with known rivet constructions.

This purpose is achieved with rivet heads resp. rivets of the kind specified in the appended independent claims. Thus, a rivet head according to the invention comprises a lower part with a lower surface, intended to protrude from the mantle surface of the rivet shell, which lower surface is arranged substantially in its entirety to form an angle> 90 ° with the axis of the rivet. Large fi iktion scratches are thereby avoided due to an average small abutment surface against the component in question, at the same time as the peripheral portion of the lower surface is not binged in damaging contact with said component during a riveting process.

Additional advantages are achieved with features according to the respective dependent claims. According to a three-year embodiment, the said lower surface thus has a curved configuration, where said angle increases substantially continuously towards the periphery of the lower surface. In this way, it is accentuated that the lower surface, in the intended deformation of the rivet head, is successively rolled / pressed against the component in question and thereby softly abuts against the surface of the component. 10 526 155 3 BRIEF DESCRIPTION OF THE DRAWING The invention is described in more detail below in connection with exemplary embodiments and the accompanying drawing, in which - Figs. Fig. 1 schematically shows an axial section through a known rivet applied for riveting and examples of a surface coating damaged in connection with the rivet head, - Fig. 2 schematically shows an axial section through a first embodiment of a rivet according to the invention, applied for riveting, Fig. 3 schematically shows the first embodiment of a rivet according to the invention, seen perpendicular to its axial direction, and - Fig. 4 schematically shows a detail according to Fig. 3 of e.g. the curved lower surface of the rivet head, seen as in Fig. 3.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT Fig. 1 shows a damage in the form of a crease 1 of the current surface coating 1 ', formed by e.g. frictional forces of the kind initially described.

A rivet 2 and a rivet head 3 according to the invention, Figs. 2-4, are similar in your ways to known rivets but also show significant differences. The rivet head 3 is arranged to be supported by and connected to a rivet fi 4 and comprises an upper part 5, against which a deformation lock fl F is intended to be applied, and a lower part 6, vilken from which the rivet fi is intended to run out.

The rivet thus arranged is intended for joining at least two components 7, 8, for example two surface-treated chassis components for a truck. 10 15 20 526 1551 4 The lower part has a lower surface 10 projecting from the mantle surface 9 of the rivet shaft 9, which substantially in its entirety, i.e. over at least almost the entire surface, forms an angle v> 90 ° with the axis of the rivet rail 1 1.

According to preferred embodiments, the lower surface has a curved configuration, where said angle increases substantially continuously towards the lower surface periphery 6 °, as shown in Figs. 2-4.

It is also preferred that the lower surface has a substantially spherical surface configuration and in this case essentially has the shape of a part of a circle, an arc of a circle, in an axial section.

It is preferred in many cases that the radius of curvature of the ball surface and the arc of the circle corresponds to at least 1.5 times the diameter of the rivet or the equivalent.

It is further preferred that the lower surface is arranged to run in towards the rivet shaft substantially perpendicular to the axis of the rivet shaft.

The function of the rivet head and the rivet according to the invention should to a significant extent have been stated above.

Due to the angular and / or, as preferred, curved design of substantially the entire lower surface, the lower surface is arranged to be successively rolled / pressed against the said component's preferably surface-treated upper side and thereby abut against said upper surface, whereby large frictional forces un- viks pga an average small abutment surface at the same time as the peripheral portion of the lower surface is not brought into damaging contact with said upper side during the riveting dry run.

The shape of the lower surface, mainly the radius of curvature / angle, is adapted to the shape and volume of the rivet head in general, so that the described process is achieved. The invention has been decided upon in connection with preferred embodiments. Of course, you can think of forms and minor changes and additions without departing from the basic idea of acquisition.

Thus, the angled lower surface of the rivet head may be considered to be substantially non-arched or arched or to be a combination of arched and non-arched surface, for example so as to comprise an outer portion corresponding to the mantle surface of a truncated cone and an adjoining arched inner portion.

It is usually preferred that the rivet according to the invention is axially symmetrical in a known manner with an overall capillary configuration of the rivet head and a substantially cylindrical. risk form of the rivet shaft.

A rivet according to the invention is preferably made of steel and in one piece. However, embodiments are conceivable where the rivet head is manufactured separately.

Claims (1)

1. 0 15 '20 25 3.30; - 526 155 6 Patent claim. Rivet head arranged to be supported by and connected to a rivet shaft and comprising an upper part, against which a defonation force is intended to be applied, and a lower part, from which said rivet fi is intended to run out, the rivet thus arranged being intended for joining of at least two components, characterized in that the lower part (6) has a lower surface (10), intended to project from the circumferential surface (9) of the rivet shaft (4), which lower surface is arranged substantially in its entirety to form an angle ( v)> 90 ° with the axis of the rivet (11) and because the lower surface has a curved configuration, where said angle increases substantially continuously towards the periphery of the lower surface (6 '). . Rivet head according to Claim 1, characterized in that the lower surface has a substantially spherical surface configuration and in this case has the shape of an arc of a circle (R) in an axial section. . Rivet head according to Claim 2, characterized in that the radius of curvature of the ball surface and the arc of a circle corresponds to at least 1.5 times the diameter of the rivet rail or the equivalent. . Rivet head according to one of the preceding claims, characterized in that the lower surface is arranged to run in towards the rivet shaft substantially perpendicular to the axis of the rivet shaft. . Rivet head according to one of the preceding claims, characterized in that the lower surface is intended to be turned and pressed against a surface-treated component surface, for example a surface-treated chassis component (7) for a truck. . Rivet for joining at least two components and comprising a rivet = _. shaft, which carries * a rivet head comprising an upper part, against which a deformation crane fi is intended to be applied, and a lower part, characterized in that *: dm undra / the part (6) haren fi án. the mantle surface of the rivet (4) projecting lower surface 10 15 526 155 in 7 (10), which essentially forms an angle (v)> 90 ° with the axis of the rivet ((11) and in that the lower surface has a curved configuration, Angle according to claim 6, characterized in that the lower surface has a substantially spherical surface configuration and in this case has an essentially the shape of an arc of a circle (R) in an axial section. Rivet according to Claim 7, characterized in that the radius of curvature of the spherical surface and the arc of a circle corresponds to at least 1.5 times the diameter or equivalent of the rivet. Rivet according to Claim 6, 7 or 8, characterized in that the lower surface runs into the rivet axis substantially perpendicular to the rivet axis. Rivet according to claim 6, 7, 8 or 9, characterized in that the lower surface is intended to be turned and pressed against a surface-treated component surface, for example a surface-treated chassis component (7) for a truck.