G-hook for mutual releasable connection of two prop portions of a variable length construction prop

{
  "publication_number": "US9926711B2",
  "country": "US",
  "kind": "B2",
  "title": "G-hook for mutual releasable connection of two prop portions of a variable length construction prop",
  "abstract": "A G-hook for the mutual releasable connection of two prop portions of a telescopic construction prop has a pin and a hoop. The pin and the hoop are different, separate parts which are rotationally rigidly connected to one another, meaning the pin cannot rotate relative to the hoop because they are rigidly fixed to one another. The pin has a force introduction portion with a surface which is curved regionally and a force removal portion which is diametrically opposite the force introduction portion and whose surface is formed substantially planar.",
  "claims": [
    "1. A G-hook for the mutual releasable connection of two prop portions of a telescopic construction prop, the G-hook comprising: a pin configured for the mutual connection of the two prop portions; and a hoop configured for captively securing the pin to the telescoping construction prop; wherein the pin and the hoop are two different parts which are produced from different qualities of steel, wherein the pin is of a higher quality of steel in comparison to the hoop, the pin configured to be dimensioned and manufactured for increased bending load capability, transverse force bearing capability, and bearing stress in comparison to the hoop and wherein the pin and hoop are rotationally rigidly connected to one another; wherein the pin comprises a force introduction portion diametrically opposed to a force removal portion, where the force introduction portion comprises a first surface which is curved at least regionally, and where the force removal portion comprises a second surface that is substantially planar, or where the second surface has a curvature which is less curved than the curvature of the first surface.",
    "2. The G-hook of claim 1, wherein the hoop is connected to the pin by a press fit connection, a form-fitted connection, a weld connection and/or a brazed connection.",
    "3. The G-hook of claim 1, wherein the pin has a freely projecting first end disposed opposite a second end of the pin, and where the hoop has a free end disposed opposite a second end of the hoop, where in the region of the second end of the pin is connected to the second end of the hoop, and where an end face of the pin at the second end comprises a blow surface.",
    "4. The G-hook of claim 3, wherein the blow surface is substantially perpendicular to a longitudinal length of the pin.",
    "5. The G-hook of claim 3, wherein the force introduction portion and the force removal portion of the pin are mutually connected via a transition portion.",
    "6. The G-hook of claim 5, wherein the hoop projects at a right angle at its second end at least regionally from the transition portion and then subsequently extends in a direction that is parallel to the freely projecting first end of the pin.",
    "7. The G-hook of claim 6, including an opening formed in the region of the second end of the pin in its transition portion, where the second end of the hoop is secured in the opening in the second end of the pin.",
    "8. The G-hook of claim 7, wherein the opening formed in the second end of the pin has mutually complementary contours in comparison to the second end of the hoop configured to secure the hoop to the pin in a form-fitted manner.",
    "9. The G-hook of claim 1, wherein the pin comprises a cross-section of substantially double T-section shape having a first flange opposite a second flange, wherein the force introduction portion is formed by the first flange and wherein the force removal portion is formed by the second flange.",
    "10. The G-hook of claim 1, wherein the pin comprises a substantially U-shaped cross-section, with the free ends of the “U” each forming the force removal portion.",
    "11. The G-hook of claim 1, wherein the pin comprises a substantially C-shaped cross-section, with the force introduction portion and the force removal portion being formed by mutually diametrically opposed curvature portions of the “C”.",
    "12. The G-hook of claim 1, wherein the pin comprises a substantially tubular cross-section that comprises an O-shaped cross-section or an oval-shaped cross section.",
    "13. The G-hook of claim 1, wherein the pin tapers at least regionally in the manner of a wedge in the direction of its freely projecting first end.",
    "14. The G-hook of claim 13, wherein the pin comprises two plateau regions which are spaced apart from one another along the longitudinal direction of the pin and wherein the two plateau regions do not taper.",
    "15. The G-hook of claim 1, wherein the pin comprises, starting from its freely projecting end viewed along the longitudinal direction, a widening first wedge portion transitioning to a first plateau region which transitions to a widening second wedge portion which transitions to a second plateau region, where a step is disposed between the first plateau region and the widening second wedge portion.",
    "16. The G-hook of claim 1, including a telescopic construction prop having an outer tube and an inner tube displaceable therein, wherein the G-hook is configured for the mutual connection of the two tubes and extending through a through-hole opening formed in each of the two tubes when the through-hole openings are aligned with one another.",
    "17. The G-hook of claim 16, wherein the through-hole openings of the inner tube have a complementary contour to an envelope of the pin at least along the force introduction portion.",
    "18. The G-hook of claim 17, wherein the pin tapers at least regionally in the manner of a wedge in the direction of its freely projecting first end and wherein two mutually aligned through-hole openings of the inner tube are each being of different heights in the case of the pin tapering in the manner of the wedge.",
    "19. The G-hook of claim 18, wherein the mutually aligned through-hole openings of the outer tube are formed as two slits which extend in a longitudinal direction of the prop and in the region of which a sunk nut is movable in the longitudinal direction of the prop via an external thread formed at an external surface of the outer tube, with the sunk nut having a planar end face on which the force removal portion of the pin of the G-hook abuts.",
    "20. The G-hook of claim 1, wherein the pin is a forged part pin, a rolled section pin or a cast part pin, and wherein the hoop is a cold-formed hoop.",
    "21. A G-hook for the mutual releasable connection of two prop portions of a telescopic construction prop, the G-hook comprising: a pin configured for the mutual connection of the two prop portions, the pin comprising a freely projecting first end disposed opposite a second end of the pin, where the second end of the pin comprises a blow surface that is substantially perpendicular to a longitudinal length of the pin; and a hoop comprising a curved free end opposite a second end, where the second end of the hoop is non-moveably connected to the second end of the pin, and wherein the curved free end of the hoop is configured for captively securing the pin to the telescoping construction prop; wherein the pin and the hoop are separately manufactured parts of two different qualities of steel, wherein the pin is of a higher quality of steel in comparison to the hoop, the pin configured to be dimensioned and manufactured for increased bending load capability, transverse force bearing capability, and bearing stress in comparison to the hoop.",
    "22. The G-hook of claim 21, wherein the pin is a forged part pin, a rolled section pin or a cast part pin, and wherein the hoop is a cold-formed hoop.",
    "23. A G-hook for the mutual releasable connection of two prop portions of a telescopic construction prop, the G-hook comprising: a pin portion connected to a hoop portion, where the pin portion is separately manufactured from the hoop portion but non-movably connected to one another; where the pin portion is configured for the mutual connection of the two prop portions, and where the pin portion comprises a freely projecting first end disposed opposite a second end along a longitudinal length, where the second end comprises a blow surface that is substantially perpendicular to the longitudinal length of the pin portion, and wherein the pin portion comprises a force introduction portion diametrically opposed to a force removal portion both disposed along its longitudinal length, where the force removal portion is substantially planar and the force introduction portion is substantially curved; and wherein the hoop portion comprises a curved free end opposite a second end, where the second end of the hoop portion is non-moveably connected to the second end of the pin portion, wherein the curved free end of the hoop portion is configured for captively securing the pin portion to the telescoping construction prop; wherein the pin portion and the hoop portion are produced from steels of different quality, wherein the pin portion is of a higher quality of steel in comparison to the hoop portion, the pin configured to be dimensioned and manufactured for increased bending load capability, transverse force bearing capability, and bearing stress in comparison to the hoop.",
    "24. The G-hook of claim 23, wherein the pin portion is a forged part pin portion, a rolled section pin portion or a cast part pin portion, and wherein the hoop portion is a cold-formed hoop portion.",
    "25. A G-hook for the mutual releasable connection of two prop portions of a telescopic construction prop, the G-hook comprising: a pin configured for the mutual connection of the two prop portions; and a hoop attached to the pin, the hoop configured for captively securing the pin to the telescoping construction prop; wherein the pin comprises a force introduction portion diametrically opposed to a force removal portion; wherein the force introduction portion comprises a first surface having a planar surface middle region disposed between two curved surface side regions; and wherein the force removal portion comprises a second surface that is substantially planar, or wherein the second surface has a curvature which is less curved than the curvature of the first surface."
  ],
  "description_excerpt": "Field of the Invention\n\nThe present invention relates in general to variable length, telescopic props such as are used, for example, in the construction industry as supports or bracing of concrete formwork elements. The present invention in particular relates to a G-hook for the mutual releasable connection of two prop portions of such a telescopic construction prop. The invention furthermore relates to a telescopic construction prop whose prop portions can be releasably connected to one another with the aid of G-hook in accordance with the invention.\n\nBackground of the Invention\n\nTelescopic props such as are used in the field of construction as supports or bracing of concrete formwork elements as a rule have an outer tube and an inner tube telescopically displaceable therein. A so-called G-hook with a circular cross-section which extends through through-hole openings formed in the two tubes and aligned with one another usually serves for the mutual releasable connection of the two tubes. The shape of the G-hook is in this respect usually selected so that the G-hook can be fastened captively, i.e. non-losably, at a telescopic prop, which takes place via a hoop of the G-hook which engages around the prop. Such G-hooks are in this respect usually formed as a one-piece or one-part component from round steel by shaping thereof. Since up to 4 ton of load or even more has to be taken up per prop, the force transfer region between the two tubes and in particular the G-hook has to be dimensioned very carefully since the total load is transferred from the inner tube to the outer tube of the prop via it.",
  "cpc": [
    "E04G 25/06",
    "E04G 25/061",
    "E04G 25/063",
    "E04G 25/066",
    "F16B 17/006",
    "F16B 2021/14",
    "F16B 21/14",
    "F16B 7/105",
    "Y10T 403/32475"
  ],
  "ipc": [
    "E04G 25/06",
    "F16B 17/00",
    "F16B 21/14",
    "F16B 7/10"
  ],
  "assignees": [
    "Peri GmbH"
  ],
  "inventors": [
    "Wilfried Haeberle",
    "Rudolf Specht"
  ],
  "filing_date": "2014-06-19",
  "publication_date": "2018-03-27",
  "grant_date": "2018-03-27",
  "priority_date": "2011-12-22",
  "application_number": "US-201414309091-A",
  "family_id": "47297258",
  "cited_by_count": 2,
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    "EP1975341A1",
    "CN201412067Y",
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    "EP2513391B1",
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  ]
}