Formwork tie

{
  "publication_number": "US2022042329A1",
  "country": "US",
  "kind": "A1",
  "title": "Formwork tie",
  "abstract": "A tie nut of a formwork tie for connecting two formwork elements is secured on a tie rod to prevent inadvertent rotation by way of a form fit coupling that can be axially made to engage therewith.",
  "claims": [
    "1. A formwork tie for connecting two formwork elements that are disposed opposite and at a distance from one another, comprising a tie rod including an external thread and a tie nut that is screwed onto the external thread, wherein the formwork tie comprises an anti-rotation element, which is non-rotatable and axially movable with respect to the tie rod, and the formwork tie comprises a releasable form fit coupling, by way of which the anti-rotation element can be releasably non-rotatably connected to the tie nut and be made to engage and disengage by an axial movement. 2. The formwork tie according to claim 1, wherein the tie nut and the anti-rotation element comprise complementary parts of the form fit coupling. 3. The formwork tie according to claim 1, wherein the tie rod has a non-circular cross-section and, in particular, an axially parallel planar surface, which holds the anti-rotation element non-rotatably at the tie rod by way of form fit. 4. The formwork tie according to claim 1, wherein the anti-rotation element comprises a sleeve that is axially displaceable on the tie rod and that has an inner cross-section, corresponding to the cross-section of the tie rod, which holds the anti-rotation element non-rotatably on the tie rod by way of form fit. 5. The formwork tie according to claim 1, wherein the tie nut and the anti-rotation element include at least one cut-out and at least one protrusion, corresponding to the cut-out, at mutually facing end faces, which can be made to engage by an axial displacement of the anti-rotation element with respect to the tie nut, and non-rotatably connect the tie nut and the anti-rotation element to one another by way of form fit when these are engaged with one another. 6. The formwork tie according to claim 1, wherein the tie nut and/or the anti-rotation element include at least one slot extending in the longitudinal direction, which is open at the end face facing the anti-rotation element and/or the tie nut, and/or the anti-rotation element and/or the tie nut include at least one rib, complementary to the slot, which enters the slot by axial displacement of the anti-rotation element with respect to the tie nut, and non-rotatably connects the tie nut and the anti-rotation element to one another by way of form fit in the slot. 7. The formwork tie according to claim 1, wherein the form fit coupling can be made to engage at angular steps, in particular at angular steps of 60°, 90°, 120°, 180° or 360°. 8. The formwork tie according to claim 1, wherein the formwork tie comprises a releasable and/or rotatable securing element, by way of which the form fit coupling can be held releasably in engagement. 9. The formwork tie according to claim 8, wherein the securing element comprises a spring clip, which can be snapped radially onto the tie nut and/or the anti-rotation element when the form fit coupling is engaged, and which connects the tie nut and the anti-rotation element to one another in an axially fixed manner by way of form fit when snapped onto the tie nut and the anti-rotation element. 10. The formwork tie according to claim 8, wherein the securing element can be rotated into a position on the tie nut in which no form fit exists in the axial direction between the tie nut and the anti-rotation element, so that the anti-rotation element can be released from the tie nut in the axial direction. 11. The formwork tie according to claim 1, wherein the tie rod includes a scale for a wall thickness of a wall to be poured which is set with the tie nut. 12. The formwork tie according to claim 11, wherein the scale corresponds to a reference plane at an established location in a longitudinal direction of the tie rod and to the tie nut."
  ],
  "description_excerpt": "The present invention relates to a formwork tie for connecting two formwork elements, which are disposed at a distance opposite one another.\n\nDISCUSSION OF RELATED ART\n\nConcrete formwork elements, or formwork elements for short, are used for pouring concrete walls. For this purpose, formwork elements are disposed at a normally constant distance, which corresponds to the thickness of the wall to be poured, opposite one another. The formwork elements typically comprise a board made of (ply)wood or plastic as a formwork shell and a planar panel made of longitudinally and transversely, or horizontally and vertically, extending steel or aluminum profiles for reinforcement on a rear side of the formwork shell. For pouring the concrete, the formwork elements are disposed at a distance from one another, with the formwork shells thereof facing one another. So as to hold the formwork elements against the pressure of free-flowing concrete poured in between, these are connected by formwork ties, which comprise tie rods, including external threads, at both ends, which are placed through insertion holes in the formwork elements disposed opposite one another, and onto the external threads of which tie nuts are screwed, on the rear sides of the formwork elements which face away from one another, the tie nuts holding the formwork elements at a distance with respect to one another. As an example, reference is made to a formwork tie that is known from the unexamined patent application DE 10 2010 002 108 A1.",
  "cpc": [
    "E04G 17/065",
    "E04G 17/0652",
    "E04G 17/0655",
    "F16B 2/245",
    "F16B 39/04",
    "F16B 39/10",
    "F16B 39/32"
  ],
  "ipc": [
    "E04G 17/065"
  ],
  "assignees": [
    "Meva Schalungs Systeme GmbH"
  ],
  "inventors": [
    "Uwe Schramm",
    "Rick Schille"
  ],
  "filing_date": "2021-07-21",
  "publication_date": "2022-02-10",
  "priority_date": "2020-08-04",
  "application_number": "US-202117381336-A",
  "family_id": "71948517",
  "cited_by_count": 0,
  "citations": [
    "US8272620B2",
    "US9708820B2",
    "US9222271B2",
    "US10662660B2",
    "US10808413B2",
    "US11047144B2"
  ]
}