Lifting anchors

Patent metadata

Field	Value
Publication number	US-10309115-B2
Application number	US-201314396812-A
Country	US
Kind code	B2
Filing date	Apr 25, 2013
Priority date	Apr 26, 2012
Publication date	Jun 4, 2019
Grant date	Jun 4, 2019

Abstract

An edge lift anchor for embedment into a concrete panel, the anchor having a head of generally plate-like form for releasable attachment with lifting equipment, and at least one leg extending from the head, for locking into the surrounding concrete, the head having an eye for receiving a locking bolt of a lifting clutch in the form of a ring clutch, the head having an upper edge engageable by the body of the ring clutch when the clutch body is inclined at the commencement of lifting a cast panel from the horizontal configuration in which it is cast to a generally vertical configuration, wherein the width of the head is such that engagement between the clutch body and the edge of the head at the commencement of lifting from a horizontal configuration is at a sufficient distance from the end of the head that any deformation of the edge of the head caused by engagement with the clutch body under the applied lifting load will be wholly contained within the width of the head.

First claim

The claims defining the invention are as follows:

1. An edge lift anchor for embedment into a concrete panel the edge lift anchor comprising:
a head configured to be releasably attached to lifting equipment; and
at least one leg extending from the head and configured to be locked into surrounding concrete of the concrete panel,
the head having:
an eye configured to receive a locking bolt of a lifting clutch in the form of a ring clutch; and
an upper edge engageable by a body of the ring clutch when the body of the clutch is inclined at the commencement of lifting a cast concrete panel from a horizontal configuration in which it is cast to a generally vertical configuration;

wherein the head (i) defines an indentation formed by a first inwardly tapered portion having a wide end and a narrow end, and a second inwardly tapered portion having a wide end and a narrow end, wherein the wide end of the first inwardly tapered portion extends from a first end of the head, and wherein the narrow end of the second inwardly tapered portion extends from the narrow end of the first inwardly tapered portion, and (ii) includes a third inwardly tapered portion extending from the head toward the at least one leg.

2. The edge lift anchor of claim 1 , wherein a width of the first end of the head is such that engagement of the clutch body with the upper edge of the head at the commencement of lifting from the horizontal configuration takes place at a distance of between about 12 mm and 16 mm from a lateral end of the upper edge.

3. The edge lift anchor of claim 1 , wherein the anchor has a lifting capacity of 3 tons and a width of the first end of the head is between about 50 mm and 65 mm.

4. The edge lift anchor of claim 1 , wherein the anchor has a lifting capacity of 7 tons and the width of the first end of the head is between about 70 mm and 85 mm.

5. The edge lift anchor of claim 1 , wherein the anchor has a lifting capacity of 10 tons and the width of the first end of the head is between about 75 mm and 90 mm.

6. An edge lift anchor for embedment into a concrete panel, the edge lift anchor comprising:
a head configured to be releasably attached to lifting equipment, the head having opposite front and back faces;
a rib protruding in a thickness direction of the head beyond both said front and back faces of the head, the rib comprising:
a first section extending from the head obliquely with respect to a longitudinal direction of the anchor; and
a second section extending from the first section along the longitudinal direction; and

at least one leg extending from the second section along the longitudinal direction, and configured to be locked into concrete surrounding the at least one leg when the lift anchor is embedded in the concrete panel, the head having an eye configured to receive a locking bolt of a lifting clutch,
wherein the head includes an upper edge configured to be engageable by a clutch body of the clutch when the clutch body is inclined at a commencement of lifting the concrete panel in which the lift anchor is embedded from a horizontal configuration, in which the concrete panel is cast, to a vertical configuration.

7. The edge lift anchor of claim 6 , wherein the edge lift anchor further includes a tension bar aperture.

8. The edge lift anchor of claim 6 , wherein the edge lift anchor further includes a tension bar aperture located, relative to the longitudinal direction of the edge lift anchor, between the eye and a beginning of the at least one leg.

9. The edge lift anchor of claim 6 , wherein the edge lift anchor further includes a tension bar aperture having a lower surface that is arcuate in transverse section.

10. The edge lift anchor of claim 6 , wherein the at least one leg includes a series of generally saw-toothed formations along its length.

11. The edge lift anchor of claim 6 , further comprising two legs, wherein respective legs of the two legs include a series of generally saw-toothed formations along the length of the respective legs, where the formations extend along the inner edges of the legs, and extend onto respective opposed faces of the respective legs.

12. The edge lift anchor of claim 6 , wherein the edge lift anchor further includes a tension bar aperture that is elongate in a direction transverse to the longitudinal direction of the edge lift anchor.

13. The edge lift anchor of claim 6 , wherein the edge lift anchor includes a body made from at least one of drop forging, casting or sintering.

14. The edge lift anchor of claim 6 , wherein a majority of the cross-sections taken at constant intervals along the longitudinal direction of the edge lift anchor normal thereto have outer profiles that are complex.

15. The edge lift anchor of claim 6 , wherein a majority of the cross-sections taken at constant intervals along the longitudinal direction of the edge lift anchor normal thereto have outer profiles that are non-rectangular.

16. An edge lift anchor configured to be embedded into a concrete panel, the edge lift anchor comprising:
a head configured to be releasably attached to lifting equipment; and
at least one leg extending from at least one longitudinal extension of an inclined rib which extends to a zone of uppermost locking formations, the locking formations configured to lock into the surrounding concrete, the head having an eye configured to receive a locking bolt of a lifting clutch in the form of a ring clutch, the head having an upper edge engageable by the body of the ring clutch when the clutch body is inclined at a the commencement of lifting a cast concrete panel from a horizontal configuration in which it is cast to a generally vertical configuration, wherein a width of the head is such that engagement between the clutch body and the upper edge of the head at the commencement of lifting from the horizontal configuration is at a distance from the end of the head that any deformation of the edge of the head caused by engagement with the clutch body under the applied lifting load will be wholly contained within the width of the head.

17. The edge lift anchor of claim 16 , wherein the edge lift anchor is embedded in a concrete panel.

18. An assembly comprising:
a concrete panel; and
the edge lift anchor of claim 16 , wherein the edge lift is embedded in the concrete panel.

19. The edge lift anchor of claim 16 , wherein the anchor has a lifting capacity of 3 tons.

20. The edge lift anchor of claim 16 , wherein the width of the head is one of:
between about 50 mm and 65 mm;
between about 70 mm and 85 mm; or
between about 75 mm and 90 mm.

21. The edge lift anchor of claim 16 , wherein the head is flat on a front surface and a back surface of the head, wherein the front and back surfaces are parallel to one another, wherein the front surface and the back surface are normal to an axial direction of the eye.

22. The edge lift anchor of claim 16 , wherein the head is a plate having chamfered edges.

Assignees

• Illinois Tool Works

Inventors

• Barraclough Andrew Saul

Classifications

• E04G21/142 Primary

  Means in or on the elements for connecting same to handling apparatus (E04B1/38 takes precedence) · CPC title

• E04G21/147 Primary

  specific for prefabricated masonry wall elements · CPC title