U.S. patent application number 10/649458 was filed with the patent office on 2005-03-03 for ring lift anchor.
This patent application is currently assigned to Universal Form Clamp Co., Inc.. Invention is credited to Hansort, Rens.
Application Number | 20050044811 10/649458 |
Document ID | / |
Family ID | 34216960 |
Filed Date | 2005-03-03 |
United States Patent
Application |
20050044811 |
Kind Code |
A1 |
Hansort, Rens |
March 3, 2005 |
Ring lift anchor
Abstract
The present invention is directed towards a lifting anchor for
embedment in a concrete member. The anchor comprises a flat bar
having a top and bottom; an upper and lower end; and a front and
rear face. The bar has a first aperture positioned for insertion of
a locking device that can be attached to a shackle for lifting the
concrete wall or element containing the anchor. The bar may have
additional apertures for insertion of reinforcing bars. The bar may
further include an upwardly curved face adjacent the bottom of the
bar, and a conical foot shaped to fit adjacent the upwardly curved
face.
Inventors: |
Hansort, Rens; (Napperville,
IL) |
Correspondence
Address: |
MICHAEL BEST & FRIEDRICH, LLP
ONE SOUTH PINCKNEY STREET
P O BOX 1806
MADISON
WI
53701
|
Assignee: |
Universal Form Clamp Co.,
Inc.
Bellwood
IL
|
Family ID: |
34216960 |
Appl. No.: |
10/649458 |
Filed: |
August 27, 2003 |
Current U.S.
Class: |
52/704 |
Current CPC
Class: |
E04C 5/16 20130101; E04G
21/142 20130101; E04B 1/41 20130101 |
Class at
Publication: |
052/704 |
International
Class: |
E04B 001/38; E04C
005/00 |
Claims
1. A concrete anchor comprising: a bar having a top, a bottom, an
upper end, a lower end, a first side, a second side, a front face,
a rear face, a first aperture, and an upwardly curved face adjacent
the bottom of the bar; and a conical foot shaped to fit adjacent
the upwardly curved face.
2. The concrete anchor of claim 1 wherein the bar further comprises
a second aperture.
3. The concrete anchor of claim 1 wherein the top of the bar
further comprises a first apex section, a first upwardly projecting
face, a top platform section, a second upwardly projecting face,
and a second apex section.
4. The concrete anchor of claim 3 wherein the first apex section,
the first upwardly projecting face, the top platform section, the
second upwardly projecting face, the second apex section, and the
first aperture define an attachment region of the anchor.
5. The concrete anchor of claim 1 wherein the upwardly curved face
has a maximum point located centrally between the first and second
sides of the bar.
6. The concrete anchor of claim 1 wherein the conical foot is
integrally formed with the bar.
7. The concrete anchor of claim 1 wherein the conical foot at least
partially defines a substantially shear-resistant region of the
anchor.
8. The concrete anchor of claim 1 wherein the bar defines a width
and a thickness, and wherein the conical foot comprises a circular
base having a diameter greater than the width and the thickness of
the bar.
9. The concrete anchor of claim 8 wherein the circular base defines
a circumference, and wherein the bar is positioned centrally with
respect to the circular base of the conical foot such that the bar
fits within the circumference of the circular base.
10. A concrete anchor comprising: a bar having a top, a bottom, an
upper end, a lower end, a first side, a second side, a front face,
a rear face, a first aperture positioned adjacent the upper end of
the bar, an upwardly curved face adjacent the bottom of the bar; a
conical foot shaped to engage the upwardly curved face; and wherein
the top of the bar further comprises a first apex section, a first
upwardly projecting face, a top platform section, a second upwardly
projecting face, and a second apex section.
11. The concrete anchor of claim 10 wherein the upwardly curved
face has a maximum point located centrally between the first and
second sides of the bar.
12. The concrete anchor of claim 10 wherein the bar further
comprises a second aperture.
13. The concrete anchor of claim 10 wherein the top of the bar and
the first aperture define an attachment region of the anchor.
14. The concrete anchor of claim 10 wherein the conical foot at
least partially defines a shear-resistant region of the anchor.
15. The concrete anchor of claim 10 wherein the bar defines a width
and a thickness, and wherein the conical foot comprises a circular
base having a diameter greater than the width and the thickness of
the bar.
Description
[0001] The present invention relates towards an erection lift
anchor assembly for embedment in a concrete member, such as a
precast or tilt-up wall. The erection anchor of the present
invention allows for concrete members, such as walls, to be
positioned by the use of standard lifting equipment (cranes with
cable attachments, etc.) by connecting lifting attachments to the
erection lift anchor which is embedded in a concrete member.
SUMMARY OF INVENTION
[0002] The present invention is directed towards a lifting anchor
for embedment in a concrete member. The anchor comprises a flat bar
having a top and bottom; an upper and lower end; a front and rear
face and a first and second side. The bar has a first aperture
positioned for insertion of a locking device that can be attached
to a shackle for lifting the concrete wall or element containing
the anchor. The bar may have additional apertures for insertion of
reinforcing bars. The bar may further include a an upwardly curved
face adjacent the bottom of the bar, and a conical foot shaped to
fit adjacent the upwardly curved face.
[0003] In one embodiment of the invention, the anchor comprises a
bar having a top and bottom; an upper and lower end; a front and
rear face and a first and second side. The top of the bar may
include a first apex section, a first upwardly projecting face, a
top platform section, a second upwardly projecting face, and a
second apex section. The bar has at least one aperture near the
upper end of the bar. The bar may contain additional apertures. The
bottom of the bar may include an upwardly curved face shaped to
engage an upper portion of a conical foot.
[0004] When the anchor of the present invention is embedded in a
concrete form, the top of the bar is positioned adjacent the face
of the concrete form. A void former, suitably made from rubber, is
placed around the anchor and covers a portion of the anchor,
including the first aperture in the upper end of the anchor. When
the concrete is poured around the anchor, the area covered by the
void former stays free of concrete, while the rest of the anchor,
including the any additional apertures, are encompassed by the
concrete. When the concrete form is hardened, the void former is
removed and a void recess is formed around a portion of the anchor,
allowing lifting hardware to be attached to the anchor, via the
aperture in the upper end of the anchor. This allows for a lifting
attachment to be suitably connected to the concrete anchor.
[0005] Other features and aspects of the invention will become
apparent to those skilled in the art upon review of the following
detailed description, drawings, and exhibits.
BRIEF DESCRIPTION OF THE DRAWINGS
[0006] FIG. 1 shows a top view of one embodiment of the concrete
lift anchor of the present invention.
[0007] FIG. 2 shows a front view of one embodiment of the concrete
lift anchor of the present invention.
[0008] FIG. 3 shows a side view of one embodiment of the concrete
lift anchor of the present invention.
[0009] FIG. 4 shows a perspective view of one embodiment of the
concrete lift anchor of the present invention.
[0010] Before one embodiment of the present invention is explained
in detail, it is to be understood that the present invention is not
limited in its application to the details of construction and the
arrangements of the components set forth in the following
description or illustrated in the drawings. The present invention
is capable of other embodiments and of being practiced or being
carried out in various ways. In addition, it is understood that the
phraseology and terminology used herein are for the purpose of
description and should not be regarded as limiting. The use of
"including", "comprising", "having" and "has" and variations
thereof herein is meant to encompass the items listed thereafter
and equivalents thereof as well as additional items and equivalents
thereof.
DETAILED DESCRIPTION
[0011] The present invention is directed towards a concrete lift
anchor. The concrete anchor is suitably made from steel. The anchor
is suitably a unitary piece made by a drop forging procedure. This
allows the anchor to be produced in one operation, and allows the
anchor to be produced out of a higher strength material, suitably
100,000 psi steel, without additional heat treatments. By using
100,000 psi steel the safe working load of the anchor is increased
25% over anchors made from 75,000 psi steel.
[0012] One exemplary embodiment of the concrete anchor of the
present invention is shown in FIGS. 1-4. The anchor 10 comprises a
flat bar 12, preferably made of steel, which has a top 14 and
bottom 16; an upper 18 and lower end 20; a front 22 and rear face
24 and a first 23 and second 25 side. The bar 12 has a generally
constant width W and thickness T. The top 14 of the bar 12 has a
first apex section 26, a first upwardly projecting face 28, a top
platform section 30, a second upwardly projecting face 32, and a
second apex section 34. The bar 12 also has a first aperture 36
near the upper end 18 of the bar. The first apex section 26, first
upwardly projecting face 28, top platform section 30, second
upwardly projecting face 32, second apex section 34 and first
aperture 36 define an attachment region of the anchor 10 adapted to
engage a lifting mechanism. That is, the design of the first apex
section 26, first upwardly projecting face 28, top platform section
30, second upwardly projecting face 32, second apex section 34 and
first aperture 36 allows for the secure attachment of a lifting
mechanism for moving and positioning a concrete form in which the
concrete anchor 10 is embedded. The lifting attachment (such as a
hook or other suitable attachment) is suitably connected to the
concrete anchor 10 via the first aperture 36. The bar 12 has a
second aperture 38 positioned beneath the first aperture 36. The
second aperture 38 allows for the insertion of a reinforcing
bar.
[0013] The bottom 16 of the bar 10 has an upwardly curved face 40
shaped to engage a conical foot 42. The upwardly curved face 40 has
a maximum point located centrally and symmetrically between the
first 23 and second 25 sides of the bar 12. The conical foot 42 has
a circular base 44 and a modified upper end 46 dimensioned to fit
adjacent the upwardly curved face 40 of the bar 12. The circular
base 44 has a diameter greater than the width W and thickness T of
the bar 12, such that when the bar 12 is engaged with the conical
foot 42 and positioned centrally with respect to the conical foot
42, all faces and sides of the bar 12 fit within the circumference
of the circular base 44, as best illustrated in FIG. 1. The conical
foot 42 acts to provide shear resistance between the anchor 10 and
the concrete member in which the anchor 10 is embedded when the
concrete member is being lifted by the anchor 10. The conical foot
42 of the anchor 10 allows for the development of a large shearcone
when the anchor 10 is used to lift the concrete form it is embedded
in. It will be readily apparent to those of ordinary skill in the
art that the bottom 16 of the bar 12 can be secured to the conical
foot 42 via a variety of fasteners or adhesives well-known in the
art (e.g., screws, bolts, nails, cement, glue, welding, or
combinations thereof), or the conical foot 42 can be integrally
formed with the bar 12.
[0014] Variations and modifications of the foregoing are within the
scope of the present invention. It is understood that the invention
disclosed and defined herein extends to all alternative
combinations of two or more of the individual features mentioned or
evident from the text and/or drawings. All of these different
combinations constitute various alternative aspects of the present
invention. The embodiments described herein explain the best modes
known for practicing the invention and will enable others skilled
in the art to utilize the invention.
* * * * *