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EP-4735700-A1 - METHOD FOR MANUFACTURING AN ANCHOR CHANNEL

EP4735700A1EP 4735700 A1EP4735700 A1EP 4735700A1EP-4735700-A1

Abstract

Method for manufacturing an anchor channel, comprising providing a channel body having a channel bottom and a rivet hole arranged in the channel bottom, providing a monolithic anchor body having a flange, a rivet shaft projecting from one side of the flange, and an anchor shaft projecting from an opposite other side of the flange, wherein the flange is wider than the rivet hole so as to abut against the channel body when the rivet shaft is inserted into the rivet hole, wherein the rivet shaft has, at least in a rivet shaft region located adjacent to the flange, larger cross-sectional area that has the anchor shaft, at least in an anchor shaft region located adjacent to the flange, inserting the rivet shaft into the rivet hole, after inserting the rivet shaft into the rivet hole, upsetting the rivet shaft so as to form a shop head, thereby riveting the anchor body to the channel body.

Inventors

  • GSTACH, PETER
  • RICKERS, PETER
  • MARDER, JOHANNES ALFRED

Assignees

  • Hilti Aktiengesellschaft

Dates

Publication Date
20260506
Application Date
20240611

Claims (5)

  1. 1. Method for manufacturing an anchor channel, comprising: - providing a channel body (10) having a channel bottom (11) and at least one rivet hole (12) that is arranged in the channel bottom (11), - providing a monolithic anchor body (20) having a flange (25), a rivet shaft (30) projecting from one side of the flange (25), and an anchor shaft (24) projecting from an opposite other side of the flange (25), wherein the flange (25) is wider than the rivet hole (12) so that the flange (25) can abut against the channel body (10) when the rivet shaft (30) is inserted into the rivet hole (12), - inserting the rivet shaft (30) into the rivet hole (12), and - after inserting the rivet shaft (30) into the rivet hole (12), upsetting the rivet shaft (30) so as to form a shop head (35), thereby riveting the monolithic anchor body (20) to the channel body (10), c h a ra cte ri z e d in that - when the monolithic anchor body (20) is provided, the rivet shaft (30) has, at least in a rivet shaft region (33) located adjacent to the flange (25), larger cross-sectional area that has the anchor shaft (24), at least in an anchor shaft region (22) located adjacent to the flange (25).
  2. 2. Method according to claim 1, c h a ra cte ri z e d in that when the monolithic anchor body (20) is provided, the monolithic anchor body (20) further comprises an anchor head (26) that is arranged on the anchor shaft (24).
  3. 3. Method according to any of the preceding claims, c h a ra cte ri z e d in that when the monolithic anchor body (20) is provided, the rivet shaft (30) has, at least in the rivet shaft region (33) located adjacent to the flange (25), generally circular cross-section with diameter d33, and when the monolithic anchor body (20) is provided, the anchor shaft (24) has, at least in the anchor shaft region (22) located adjacent to the flange (25), generally circular crosssection with diameter d22.
  4. 4. Method according to claim 3, c h a ra cte ri z e d in that the following relation holds for the diameter d 3 3 and diameter d22: d33 >= CI22 + 0.3 mm, d33 <= d22 + 2.0 mm.
  5. 5. Anchor channel obtained by a method according to any of the proceeding claims.

Description

Method for manufacturing an anchor channel The invention relates to a method for manufacturing an anchor channel according to the preamble of claim 1 , and to an anchor channel obtained using this method. US4052833 A discloses a method for manufacturing an anchor channel, in which a flanged monolithic anchor body is inserted into a channel body and connected thereto by riveting. EP0400588 A1 discloses another method for manufacturing an anchor channel. In case of EP0400588 A1 , a multi-part, non-monolithic anchor body is used. The non-monolithic anchor body comprises a shank consisting of constructional steel, which shank is welded to a foot consisting of stainless steel. The foot is, in term, riveted to the channel body. The foot is oversized with respect to the shank, so that a ridge, which forms during the welding-together of shank and foot, does not radially project over the adjacent foot. According to EP0400588 A1 , this is since such a radially-projecting ridge could potentially act as a concrete anchor and forming of a radially-projecting ridge could therefore potentially lead to an anchoring site at a location where no anchoring is desired, namely at a location close to the channel body, instead of deep within the concrete, where anchor performance is often highest. Having the foot of a non-monolithic anchor body oversized with respect to its shank thus prevents the forming of unwanted geometrical features during the joining process that is characteristic of a non-monolithic item. It is an object of the invention to provide a method for manufacturing an anchor channel and an anchor channel manufactured therewith, which provide, at particularly low expenditure, particularly good anchor performance. This object is achieved by a method according to claim 1. Dependent claims refer to preferred embodiments of the invention. Accordingly, there is provided a method for manufacturing an anchor channel, comprising: - providing a channel body having a channel bottom and at least one rivet hole that is arranged in the channel bottom, - providing a monolithic anchor body having a flange, a rivet shaft projecting from one side of the flange, and an anchor shaft projecting from an opposite other side of the flange, wherein the flange is wider than the rivet hole so that the flange can abut against the channel body when the rivet shaft is inserted into the rivet hole, - inserting the rivet shaft into the rivet hole, and - after inserting the rivet shaft into the rivet hole, upsetting the rivet shaft so as to form a shop head, thereby riveting the monolithic anchor body to the channel body, characterized in that - when the monolithic anchor body is provided, the rivet shaft has, at least in a rivet shaft region located adjacent to the flange, larger cross-sectional area that has the anchor shaft, at least in an anchor shaft region located adjacent to the flange. The invention is based on the finding that it might be desirable to have shop heads of particularly large diameter at the rivet connection site between the monolithic anchor body and the channel body. This is since having large diameter shop heads allows large area force transfer, and thus allows reducing the wall strength of the channel body without compromising on the strength of the rivet connection. On the other hand, since the the additional mass of a large diameter shop head is merely local, the overall material expenditure can be kept particularly low. The material for forming large diameter shop heads generally originates from the deformed rivet shaft. In this context, the invention has found that it can be advantageous to provide this shop head forming material in the cross-section of the rivet shaft, instead of in the length of the rivet shaft. This advantage could be explained by a tendency of long rivet shafts to buckle during upsetting, potentially leading to inhomogeneous deformation and thus to reduced rivet load capacity. Accordingly, relatively high manufacturing effort might be necessary. In contrast, with shorter, but thicker rivet shafts (i.e. shafts with relatively large cross sectional area orthogonal to the longitudinal axis of the anchor body), the same rivet load capacity might be achieved with less manufacturing effort. On this basis, the invention proposes to provide, at least adjacent to the flange, the rivet shaft with larger cross-sectional area than the anchor shaft (with cross-sectional area in both cases measured orthogonally to the longitudinal axis of the monolithic anchor body). Thus, material is provided only where it is needed: The relatively large cross-section of the rivet shaft allows particularly low riveting effort, whereas the relatively thin anchor shaft prevents unnecessarily high material expenditure. Thus particularly good anchor performance can be achieved at particularly low expenditure, with regards to channel body wall thickness, overall anchor body mass and/or manufacturing effort. An anchor channel