Anchor and clutch assembly

Abstract

Anchors, clutches, and lifting systems are described herein that increase the size of a shear cone within a precast concrete panel without using multiple clutches and without increasing the complexity of the lift system. A shear cone is the volume within the panel that the anchor and clutch pull on when orienting and positioning the precast concrete panel. Anchors described herein encompass a larger volume of the panel in different ways to produce a larger shear cone. Similarly, the clutches described herein have features that allow a clutch to accommodate the improved anchors. As a result, the anchors, clutches, and lifting systems provide a larger shear cone in the panel to increase the load capacity of the lifting system and reduce the likelihood of failure.

Claims

1. A lifting clutch for selectively engaging and receiving a lifting anchor embedded in a precast concrete panel, comprising: a top portion at least partially defining an opening, wherein a top surface of said top portion has a first radius of curvature, and a first width; a bottom portion having opposed first and second planar end surfaces located at distal ends thereof, the bottom portion defining a recess configured to receive the lifting anchor, wherein a first portion of a bottom surface of said bottom portion has a second radius of curvature larger than said first radius of curvature, and wherein at least a second portion of said bottom surface is set at an angle relative to said first portion of said bottom surface; and a first wing and a second wing of said bottom portion extending outwardly to define a second width that is larger than said first width of said top portion, wherein a first outer surface of said first wing and a second outer surface of said second wing are substantially parallel, and wherein the first planar end surface and the second planar end surface are substantially parallel with each other.

2. The lifting clutch of claim 1, wherein said recess is a single recess in said bottom portion.

3. The lifting clutch of claim 1, further comprising: a pin extending through said opening in said clutch, said pin positioned in a volume at least partially defined by said top portion and said bottom portion, wherein said pin is configured to rotate between an open position to allow the lifting anchor to be positioned in said recess and a closed position to secure the lifting anchor in said recess.

4. The lifting clutch of claim 3, further comprising an aperture extending through at least one of said second width of said bottom portion or said first width of said top portion, and said aperture configured to receive a bail to secure said pin within said volume.

5. The lifting clutch of claim 1, wherein said second radius of curvature is at least 10% larger than said first radius of curvature.

6. The lifting clutch of claim 5, wherein said second radius of curvature is about 20% larger than said first radius of curvature.

7. The lifting clutch of claim 1, wherein said width of said bottom portion is at least 10% larger than said width of said top portion.

8. The lifting clutch of claim 7, wherein said width of said bottom portion is at least 25% larger than said width of said top portion.

9. The lifting clutch of claim 8, wherein said width of said bottom portion is about 40% larger than said width of said top portion.

10. A lifting clutch for selectively engaging and receiving at least one lifting anchor embedded in a precast concrete panel, comprising: a top portion at least partially defining an opening, wherein said top portion has a first width, wherein said top portion has a top surface with a first radius of curvature; a bottom portion having opposed first and second planar end surfaces located at distal ends thereof, the bottom portion defining a recess configured to receive multiple portions of the at least one lifting anchor, wherein said bottom portion has a bottom surface with a second radius of curvature that is about 25% larger than said first radius of curvature; and a first wing and a second wing of said bottom portion extending outwardly to define a second width that is larger than said first width of said top portion, wherein a first outer surface of said first wing and a second outer surface of said second wing are substantially parallel, wherein the first planar end surface and the second planar end surface are substantially parallel with each other, and wherein said second width is 10% to about 40% larger than said first width.

11. The lifting clutch of claim 10, wherein said recess is a single recess in said bottom portion.

12. The lifting clutch of claim 10, wherein at least a second portion of said bottom surface at least partially defines said recess and is set at an angle relative to said first portion of said bottom surface.

13. The lifting clutch of claim 10, further comprising: a pin extending through said opening in said clutch, said pin positioned in a volume at least partially defined by said top portion and said bottom portion, wherein said pin is configured to rotate between an open position to allow the multiple portions of said at least one lifting anchor to be positioned in said recess and a closed position to secure the multiple portions of said at least one lifting anchor in said recess.

14. The lifting clutch of claim 13, further comprising an aperture extending through at least one of said second width of said bottom portion or said first width of said top portion, and said aperture configured to receive a bail to secure said pin within said volume.

15. A lifting clutch for selectively engaging and receiving at least one lifting anchor embedded in a precast concrete panel, comprising: a top portion at least partially defining at least one opening, wherein a top surface of said top portion has a first radius of curvature, and a first width; a bottom portion having opposed first and second planar end surfaces located at distal ends thereof, the bottom portion defining a recess configured to receive multiple portions of said at least one lifting anchor, wherein a first portion of a bottom surface of said bottom portion has a second radius of curvature larger than said first radius of curvature, and wherein at least a second portion of said bottom surface is set at an angle relative to said first portion of said bottom surface; a first wing and a second wing of said bottom portion extending outwardly to define a second width that is larger than said first width of said top portion, wherein a first outer surface of said first wing and a second outer surface of said second wing are substantially parallel, and wherein the first planar end surface and the second planar end surface are substantially parallel with each other; and a pin extending through said at least one opening in said clutch, said pin positioned in a volume at least partially defined by said top portion and said bottom portion, wherein said pin is configured to rotate between an open position to allow the multiple portions of said at least one lifting anchor to be positioned in said recess and a closed position to secure the multiple portions of said at least one lifting anchor in said recess.

16. The lifting clutch of claim 15, said at least one opening including two openings, wherein said pin extends through both of said openings in said clutch.

17. The lifting clutch of claim 15, further comprising an aperture extending through at least one of said second width of said bottom portion or said first width of said top portion, and said aperture configured to receive a bail to secure said pin within said volume.

18. The lifting clutch of claim 15, wherein said recess is a single recess in said bottom portion.

19. The lifting clutch of claim 18, wherein said multiple portions of said at least one lifting anchor are two anchors, and wherein said single recess is configured to simultaneously receive both of said lifting anchors.

20. The lifting clutch of claim 18, wherein said multiple portions of said at least one lifting anchor are two clutch engagement portions of a respective lifting anchor, and wherein said single recess is configured to simultaneously receive said respective lifting anchor at each of said clutch engagement portions.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the invention and together with the Summary of the Invention given above and the Detailed Description of the drawings given below, serve to explain the principles of these embodiments. In certain instances, details that are not necessary for an understanding of the invention or that render other details difficult to perceive may have been omitted. It should be understood, of course, that the invention is not necessarily limited to the particular embodiments illustrated herein. Additionally, it should be understood that the drawings are not necessarily to scale.

(2) FIG. 1A is a top plan view of an anchor in accordance with one embodiment of the present invention;

(3) FIG. 1B is a side elevation view of the anchor in FIG. 1A in accordance with one embodiment of the present invention;

(4) FIG. 1C is another side elevation view of the anchor in FIG. 1A in accordance with one embodiment of the present invention;

(5) FIG. 1D is a partial cross-sectional view of the anchor in FIG. 1A within a precast concrete panel in accordance with one embodiment of the present invention;

(6) FIG. 1E is another partial cross-sectional view of the anchor in FIG. 1A within a precast concrete panel in accordance with one embodiment of the present invention;

(7) FIG. 2A is a front elevation view of another anchor in accordance with one embodiment of the present invention;

(8) FIG. 2B is a side elevation view of the anchor in FIG. 2A in accordance with one embodiment of the present invention;

(9) FIG. 3 is a front elevation view of a further anchor in accordance with one embodiment of the present invention;

(10) FIG. 4A is a front elevation view of yet another anchor in accordance with one embodiment of the present invention;

(11) FIG. 4B is a top plan view of the anchor in FIG. 4A in accordance with one embodiment of the present invention;

(12) FIG. 4C is a side elevation view of the anchor in FIG. 4A in accordance with one embodiment of the present invention;

(13) FIG. 5A is a front elevation view of a lifting clutch in accordance with one embodiment of the present invention;

(14) FIG. 5B is a side elevation view of the lifting clutch in FIG. 5A in accordance with one embodiment of the present invention; and

(15) FIG. 6 is a perspective view of another lifting clutch in accordance with one embodiment of the present invention.

(16) Similar components and/or features may have the same reference label. Further, various components of the same type may be distinguished by following the reference label by a letter that distinguishes among the similar components. If only the first reference label is used, the description is applicable to any one of the similar components having the same first reference label irrespective of the second reference label.

(17) A list of the various components shown in the drawings and associated numbering is provided herein:

(18) TABLE-US-00001 Number Component 10 Anchor 12 First Bar 14 Second Bar 16 Encompassed Volume 18 First Arm 20 Second Arm 22 Center Portion 24 First End 26 Second End 28 Precast Concrete Panel 30 Void 31 Common Aperture 32 Shear Cone 34 Arm Angle 36 Bar Angle 38 Bridge Member 40 First Clutch Engagement Portion 42 Second Clutch Engagement Portion 44 Clutch Angle 46 Spacing Portion 48 Spacing Angle 50 Second Clutch Radius 52 Anchor Height 54 Clutch Offset 56 Anchor Length 58 Combined Bar Thickness 60 Bar Thickness 62 Anchor Width 64 Clutch 66 Top Portion 68 Bottom Portion 70 Aperture 72 First Radius of Curvature 74 Second Radius of Curvature 76 Recess 78 Top Width 80 First Wing 82 Second Wing 84 Bottom Width 86 Volume 88 Opening 90 Lifting System 92 Pin 94 Bail

DETAILED DESCRIPTION

(19) The present invention has significant benefits across a broad spectrum of endeavors. It is the Applicant's intent that this specification and the claims appended hereto be accorded a breadth in keeping with the scope and spirit of the invention being disclosed despite what might appear to be limiting language imposed by the requirements of referring to the specific examples disclosed. To acquaint persons skilled in the pertinent arts most closely related to the present invention, a preferred embodiment that illustrates the best mode now contemplated for putting the invention into practice is described herein by, and with reference to, the annexed drawings that form a part of the specification. The exemplary embodiment is described in detail without attempting to describe all of the various forms and modifications in which the invention might be embodied. As such, the embodiments described herein are illustrative, and as will become apparent to those skilled in the arts, may be modified in numerous ways within the scope and spirit of the invention.

(20) Although the following text sets forth a detailed description of numerous different embodiments, it should be understood that the detailed description is to be construed as exemplary only and does not describe every possible embodiment since describing every possible embodiment would be impractical, if not impossible. Numerous alternative embodiments could be implemented, using either current technology or technology developed after the filing date of this patent, which would still fall within the scope of the claims. To the extent that any term recited in the claims at the end of this patent is referred to in this patent in a manner consistent with a single meaning, that is done for sake of clarity only so as to not confuse the reader, and it is not intended that such claim term by limited, by implication or otherwise, to that single meaning.

(21) Various embodiments of the present invention are described herein and as depicted in the drawings. It is expressly understood that although the figures depict anchors and lifting clutches, and methods and systems for using the same, the present invention is not limited to these embodiments.

(22) Now referring to FIGS. 1A-1E, various views of an anchor 10 that can be embedded in a precast concrete panel are provided. A clutch of a lifting system can selectively connect to the anchor 10 to orient and position the precast concrete panel. FIGS. 1A, 1B, and 1C show a top plan view, a front elevation view, and a side elevation view, respectively, of the anchor 10. The anchor 10 comprises a first bar 12 and a second bar 14 that extend in three dimensions to define an enclosed volume 16. The bars 12, 14 extend into concrete and enclose a volume of concrete 16 to secure the anchor 10 within the concrete. In prior art embodiments with a single bar, an anchor could enclose only a volume with the thickness of the single bar. In contrast, the enclosed volume 16 depicted in FIGS. 1A-1C is several times larger, and the larger enclosed volume 16 results in a larger shear cone in a precast concrete panel.

(23) As shown in FIG. 1B, the first bar 12 has a first arm 18 and a second arm 20 that are joined at a center portion 22, and each arm 18, 20 has a respective end 24, 26 that can be deflected at an angle relative to the remaining portions of the arms 18, 20 to provide a more secure connection between the first bar 12 of the anchor 10 and the precast concrete panel in which the anchor 10 is positioned. The center portion 22 can be curved and positioned in a void of the precast concrete panel, and the center portion 22 can serve as a clutch engagement portion that is positioned in a clutch of a lifting system that orients and positions the precast concrete panel.

(24) Initially, the bars 12, 14 can be a single, straight bar that is shaped and bent into the configuration shown. The bars 12, 14 may be joined at the center portions 22 using, for example, a weld. The bars 12, 14 can be joined prior to or after selective connection with a lifting clutch. Further, in some embodiments, the bars 12, 14 are provided in a lifting clutch without welding. The bars 12, 14 in FIGS. 1A-1C are ⅜ inch×¾ inch bent bars, but it will be appreciated that embodiments of the present invention can include bars of various sizes and shapes.

(25) Now referring to FIGS. 1D and 1E, a front elevation view and a side elevation view, respectively, of the anchor 10 positioned in a precast concrete panel 28 are provided. As shown in FIG. 1D, this view shows the first bar 12 of the anchor positioned in the precast concrete panel 28, and a center portion 22 of the first bar 12 extends into a void 30 of the precast concrete panel. The void 30 can be formed by a structure such as a void former that surrounds the center portion 22 and excludes concrete as concrete is poured into a form and cures around the anchor. The void former can then be removed from the precast concrete panel, and a clutch of a lifting system can then enter the void 30 and selectively connect to the center portion 22. Specifically, the clutch can extend through an aperture 31 that is defined by the center portions of the bars. The center portions are positioned adjacent and/or side by side to define a single, common aperture 31. Therefore, a single clutch can selectively connect to a single anchor that provides an increased shear cone.

(26) FIG. 1D shows the shear cone 32 that extends upward to a surface of the precast concrete panel 28. From this perspective the shear cone 32 extends from the distal ends of the bar 12 and upward and outward to the surface of the precast concrete panel 28. Also depicted is an arm angle 34 between the arms of the first bar 12. In some embodiments, the arm angle 34 is between approximately 15 and 60 degrees. In various embodiments, the arm angle 34 is approximately 45 degrees.

(27) FIG. 1E is a side elevation view of the anchor embedded in a precast concrete panel 28. This partial cross sectional view shows the two bars 12, 14 of the anchor extending into the precast concrete panel 28, and a shear cone 32 extending upwardly and outwardly from distal ends of the bars 12, 14 to the surface of the precast concrete panel 28. From this view, it is apparent that the use of two bars 12, 14 increases the size of the shear cone 32 to encompass a larger volume than if the anchor had only a single bar. As a result of the large shear cone 32, a clutch and lifting system pulling on the anchor will pull on a larger volume of the precast concrete panel 28. This allows the lifting system to bear a precast concrete panel with a larger mass and weight, and this also reduces the likelihood of the structure of the precast concrete panel failing as the lifting system orients and positions the precast concrete panel 28. The arms of the bars 12, 14 can be oriented at a bar angle 36. In some embodiments, the bar angle 36 is between approximately 15 and 60 degrees. In various embodiments, the bar angle 36 is approximately 45 degrees. It will be appreciated that the center portion 22a, 22b of each bar 12, 14 can form an angle to the remaining portions of the bar 12, 14 that is half of the bar angle 36 in some embodiments.

(28) Now referring to FIGS. 2A and 2B, a front elevation view and a side elevation view of an anchor 10 are provided, respectively. In this embodiment, two bars 12, 14 are joined by a bridge member 38 that can be welded to center portions 22a, 22b of each of the bars 12, 14. The bridge member 38 in this embodiment is a ¾ inch square bar, but it will be appreciated that the bridge member 38 can include bars of various sizes and shapes. The bridge member 38 is positioned in a lifting clutch and the bars 12, 14 provide an increased shear cone size to increase the load capacity of the anchor-and-clutch assembly.

(29) Now referring to FIG. 3, a front elevation view of a bar 12 is provided. In this embodiment, the bar 12 has a first arm 18 and a second arm 20 that are joined by a center portion 22. However, the center portion 22 does not have a constant radius of curvature. Rather, the center portion 22 has a first radius of curvature at the connection with the first arm 18, a second radius of curvature at the connection with the second arm 20, and the center portion 22 extends along a length dimension. This center portion 22 is substantially straight and defines a larger shear cone that increases the load capacity of the anchor-and-clutch assembly. The center portion 22 can extend between approximately 1 and 8 inches in some embodiments. In various embodiments, the center portion 22 is approximately 3 inches. The bar 12 can be ⅝ inch or ¾ inch square bar, but it will be appreciated that the bar 12 can be various sizes and shapes.

(30) Now referring to FIGS. 4A-4C, various views of an anchor are provided. In this embodiment, the anchor comprises a first bar 12 and a second bar 14, and each bar 12, 14 has a first arm 18 and a second arm 22 joined by a center portion. The center portion comprises a first clutch engagement portion 40 and a second clutch engagement portion 42 joined by a spacing portion 46. The clutch engagement portions 40, 42 may be partially positioned in one or more voids formed in a precast concrete panel. The spacing portion 46 may be partially embedded within the concrete of the panel to provide a more secure connection between the anchor and the panel.

(31) The first engagement portion 40 of the first bar 12 defines a first common aperture 31a with a corresponding engagement portion of the other bar, and the second engagement portion 42 of the first bar 12 defines a second common aperture 31b with a corresponding engagement portion of the other bar. A clutch, as described below with respect to FIG. 6, may have a pin that has two parts, where each part selectively extends through one common aperture 31a, 31b to selectively connect the clutch to the anchor.

(32) In this embodiment, each clutch engagement portion 40, 42 has a two straight parts oriented at a clutch angle 44 that is between approximately 45 and 90 degrees. In various embodiments, the clutch angle 44 is between 60 and 75 degrees. Each clutch engagement portion 40, 42 also defines a radius of curvature 50 that is between 0.1 and 1 inches in some embodiments. In various embodiments, the radius of curvature 50 is approximately 0.37 inches. The spacing portion 46 has parts that form a spacing angle 48 that is between approximately 45 and 135 degrees in some embodiments. In various embodiments, the spacing angle 48 is approximately 90 degrees. In addition, an anchor height 52 is between approximately 4 and 24 inches in some embodiments. In various embodiments, the anchor height 52 is approximately 8 inches. A clutch offset 54 between the peaks of the two clutch engagement portions 40, 42 is between 2 and 24 inches in some embodiments. In various embodiments, the clutch offset 54 is approximately 6 inches. Dimensions of the anchor are provided in inches, and angles between various portions of the anchor are provided. It will be appreciated that these dimensions and angles are exemplary in nature and are not to be understood as limiting in nature. The term approximately can indicate a less than 10% relative difference.

(33) FIG. 4B is a top plan view of the anchor with the first and second bars 12, 14. A length of the anchor 56 is between approximately 6 and 24 inches in some embodiments. In various embodiments, the anchor length 56 is approximately 8.23 inches. A combined bar thickness 58 at the center portions of the bars 12, 14 is between approximately 0.1 and 4 inches in some embodiments. In various embodiments, the combined thickness 58 is approximately 0.75 inches. A thickness 60 of an individual bar 12, 14 is between approximately 0.1 and 2 inches in some embodiments. In various embodiments, the thickness 60 is approximately 0.38 inches. FIG. 4C shows a side elevation view of the bars 12, 14. A width between distal ends of the bars 12, 14 or anchor width 62 is between approximately 2 and 12 inches in some embodiments. In various embodiments, the anchor width 62 is approximately 4.75 inches.

(34) Now referring to FIGS. 5A and 5B, a front elevation view and a side elevation view of a lifting clutch 64 are provided, respectively. The lifting clutch 64 can be part of a lifting system that orients and positions a precast concrete panel, and the lifting clutch 64 can selectively connect to an anchor embedded in the panel. The lifting clutch 64 has a top portion 66 and a bottom portion 68. The top portion 66 can have a surface that is defined by a first radius of curvature 72, and the bottom portion 68 can have a surface that is defined by a second radius of curvature 74. In some embodiments, the second radius of curvature 74 is larger than the first radius of curvature 72 to provide an increased area for a larger recess to receive a larger anchor. For instance, the clutch 64 may accommodate an anchor that has two bars positioned adjacent to each other, and an engagement portion with a single, common aperture is formed by side-by-side center portions of the two bars. Similarly, the clutch 64 may have only a single recess to receive the large anchor. Further, an aperture 70 may extend through the top portion 66 and/or the bottom portion 68, and the aperture 70 receives a bail of a lifting system, and the bottom portion 68 of the clutch 64 defines a recess 76 that receives the clutch engagement portion of an anchor.

(35) As shown in FIG. 5B, the bottom portion 68 may have a first wing 80 and a second wing 82 that extend outwardly in a width direction. These wings 80, 82 define a bottom width 84 of the bottom portion that is larger than a top width 78 of the top portion. The difference in widths 78, 84 of the top and bottom portions and the difference in radiuses of curvature provide a larger area to receive an anchor. These improvements also allow the lifting clutch 64 to accommodate a wide variety of anchor shapes, including the novel anchors described herein that provide an increased shear cone size in a precast concrete panel.

(36) The radius of curvature of the bottom surface of the lower portion can be increased by at least 10% over the radius of curvature of the top surface of the top portion of the lifting clutch. In some embodiments, the radius of curvature of the bottom surface of the lower portion can be increased by at least 20% over the radius of curvature of the top surface of the top portion of the lifting clutch. In various embodiments, the radius of curvature of the bottom surface of the lower portion can be increased by at least 20% over the radius of curvature of the top surface of the top portion of the lifting clutch. Referring to FIG. 5B, the extended wings can increase the width dimension of the lower portion relative to the top portion of the lifting clutch by at least 10%. In some embodiments, the wings can increase the width dimension of the lower portion relative to the top portion of the lifting clutch by at least 25%. In various embodiments, the wings can increase the width dimension of the lower portion relative to the top portion of the lifting clutch by at least 40%.

(37) In addition, as shown in FIG. 5B, the clutch 64 defines a volume 86 and a top opening 88 to receive a pin. The pin can rotate within the clutch 64 to selectively extend across the recess 76 of the clutch 64 and secure the clutch 64 to an anchor within a precast concrete panel. Operation of a pin is further described in U.S. Pat. No. 7,905,063 to Kelly, which is hereby incorporated by reference in its entirety.

(38) Now referring to FIG. 6, a perspective view of a lifting clutch 64 is provided. The lifting clutch 64 comprises a first opening 88a and a second opening 88b to receive distal ends of a pin 92. The clutch 64 defines a recess 76 that can accommodate two anchors and/or an anchor with two clutch engagement portions as shown in FIGS. 4A-4C. The bail 94 can extend through an aperture 70 in the clutch 64 to join the clutch 64 with other components of the lifting system 90 such as a rope or cable. This clutch 64 accommodates larger anchors embedded in a precast concrete panel, and the larger anchors can produce larger shear cones.

(39) The description of the present invention has been presented for purposes of illustration and description, but is not intended to be exhaustive or limiting of the invention to the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments described and shown in the figures were chosen and described in order to best explain the principles of the invention, the practical application, and to enable those of ordinary skill in the art to understand the invention.

(40) While various embodiments of the present invention have been described in detail, it is apparent that modifications and alterations of those embodiments will occur to those skilled in the art. Moreover, references made herein to “the present invention” or aspects thereof should be understood to mean certain embodiments of the present invention and should not necessarily be construed as limiting all embodiments to a particular description. It is to be expressly understood that such modifications and alterations are within the scope and spirit of the present invention, as set forth in the following claims.