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Patent 2781471 Summary

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(12) Patent: (11) CA 2781471
(54) English Title: A CHAIR FOR A CONCRETE LIFTING ANCHOR
(54) French Title: ETRIER POUR UNE ANCRE DE LEVAGE DE BETON
Status: Granted
Bibliographic Data
(51) International Patent Classification (IPC):
  • E04C 5/12 (2006.01)
  • E04C 5/16 (2006.01)
  • E04G 21/12 (2006.01)
(72) Inventors :
  • SLADOJEVIC, ROBERT (Australia)
(73) Owners :
  • PRE-FORM SYSTEMS DOO (Serbia)
(71) Applicants :
  • CASNE VERIGE PTY LTD (Australia)
(74) Agent: SMART & BIGGAR LP
(74) Associate agent:
(45) Issued: 2018-01-02
(86) PCT Filing Date: 2009-11-25
(87) Open to Public Inspection: 2010-06-10
Examination requested: 2014-11-24
Availability of licence: N/A
(25) Language of filing: English

Patent Cooperation Treaty (PCT): Yes
(86) PCT Filing Number: PCT/AU2009/001540
(87) International Publication Number: WO2010/063061
(85) National Entry: 2012-05-22

(30) Application Priority Data: None

Abstracts

English Abstract

A chair for supporting an edgelift anchor for use in lifting a concrete component, said anchor comprising a head portion engagable with a clutch of a lifting system, and a body portion for embedment with the concrete component, wherein the chair has surfaces configured for supporting the edgelift anchor relative to a casting surface during casting of the concrete component.


French Abstract

L'invention concerne un étrier destiné à supporter une ancre de levage de bord à des fins d'utilisation pour lever une pièce en béton, ladite ancre comportant une partie tête en mesure d'entrer en prise avec un embrayage d'un système de levage, et une partie corps à des fins de noyage avec la pièce en béton, l'étrier ayant des surfaces configurées pour supporter l'ancre de levage de bord par rapport à une surface de moulage lors du moulage de la pièce en béton.
Claims

Note: Claims are shown in the official language in which they were submitted.



16

WE CLAIM:

1. A chair for supporting an edgelift anchor for use in lifting a concrete
component, said
anchor having a longitudinal axis comprising a head portion engagable with a
clutch of a
lifting system, and a body portion for embedment within the concrete
component,
wherein the chair has surfaces configured for supporting the edgelift anchor
such that the
longitudinal axis of the anchor is substantially parallel to a casting surface
during casting
of the concrete component.
2. A chair as claimed in claim 1, wherein the chair has first and second
parts configured to
support the anchor relative to the casting surface at a first height using the
first part on its
own, or in conjunction with the second part to provide a range of further
heights.
3. A chair as claimed in claim 2, wherein the first and second parts are
arranged so as to be
used in conjunction in one configuration to support the anchor at a second
height relative
to the casting surface, and in another configuration in which the second part
is inverted to
support the anchor at a third height relative to the casting surface.
4. A chair as claimed in any one of claims 1 to 3, in combination with an
edgelift anchor
supported by the chair, wherein the body portion of the anchor has a plane
oriented
substantially parallel to the casting surface.
5. A chair as claimed in any one of claims 1 to 3, in combination with an
edgelift anchor
supported by the chair, wherein the body portion of the anchor has a plane
oriented
substantially perpendicular to the casting surface.
6. A chair as claimed in claim 4 or claim 5, wherein the head portion of
the anchor has a
plane oriented substantially perpendicular to the casting surface.
7. A chair as claimed in any one of claims 1 to 6, wherein the chair is
adapted for
supporting a void former fitted to the anchor.


17

8. A chair as claimed in claim 7, including one or more arms which extend
to directly
support the void former
9. A chair as claimed in any one of claims 1 to 8, wherein the chair is
adapted to support a
reinforcement mesh of the concrete component.
10. A chair as claimed in claim 9, including an insert for supporting the
reinforcement mesh.
11. A chair as claimed in claim 10, including a range of inserts which are
interchangeable for
supporting the reinforcement mesh at different heights relative to the anchor.
12. A chair as claimed in any one of claims 1 to 11, wherein the chair is
provided with one or
more holders for holding a shear bar in place relative to the anchor.

Description

Note: Descriptions are shown in the official language in which they were submitted.



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A CHAIR FOR A CONCRETE LIFTING ANCHOR

Field of the Invention

This invention relates to a chair for a concrete component lifting anchor and,
more
particularly but not exclusively, to a height-adjustable chair for an edgelift
anchor.
Background of the Invention

It is known to lift a concrete panel by way of an edgelift anchor embedded
within a
side edge of the concrete panel during casting of same. Typically, the
edgelift anchor is
held in place during casting by supporting the anchor on a sideform used for
casting the
concrete panel. However, the applicant has identified that edgelift anchors
supported in
this way are difficult to support adequately, and are prone to being embedded
incorrectly
relative to the concrete panel, particularly due to movement of the anchor
under its own
weight, and due to movement of the sideform.

Concrete panels may also be lifted by a facelift anchor embedded within a face
of
the concrete panel during casting. The applicant has determined that existing
apparatus for
supporting a facelift anchor during casting of a concrete panel typically lack
the ability to
conveniently adjust the height of the anchor relative to the concrete panel.
Accordingly,
the anchor may be set to an incorrect depth within the concrete component.

Examples of the invention seek to solve, or at least ameliorate, one or more
disadvantages of previous apparatus for supporting lifting anchors during
casting of
concrete components.

Summary of the Invention

In accordance with one aspect of the present invention, there is provided a
chair for
supporting an edgelift anchor for use in lifting a concrete component, said
anchor


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comprising a head portion engagable with a clutch of a lifting system, and a
body portion
for embedment with the concrete component, wherein the chair has surfaces
configured for
supporting the edgelift anchor relative to a casting surface during casting of
the concrete
component.
Preferably, the chair has first and second parts configured to support the
anchor
relative to the casting surface at a first height using the first part on its
own, or in
conjunction with the second part to provide a range of further heights. More
preferably,
the first and second parts are arranged so as to be used in conjunction in one
configuration
to support the anchor at a second height relative to the casting surface, and
in another
configuration in which the second part is inverted to support the anchor at a
third height
relative to the casting surface.

Preferably, the chair is configured to support the anchor such that a
longitudinal
axis of the anchor is substantially parallel to the casting surface.

In one example, the chair is provided in combination with an edgelift anchor
supported by the chair, wherein the body portion of the anchor has a plane
oriented
substantially parallel to the casting surface.
In another example, the chair is provided in combination with an edgelift
anchor
supported by the chair, wherein the body portion of the anchor has a plane
oriented
substantially perpendicular to the casting surface.

Preferably, the head portion of the anchor has a plane oriented substantially
perpendicular to the casting surface.

In accordance with another aspect of the present invention, there is provided
a chair
for supporting an anchor for use in lifting a concrete component, said anchor
comprising a
head portion engagable with a clutch of a lifting system, and a body portion
for
embedment with the concrete component, wherein the chair has first and second
parts


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configured to support the anchor, during casting, relative to the casting
surface at a first
height using the first part on its own, or in conjunction with the second part
to provide a
range of further heights.

Preferably, the first part has a support for the anchor, and the second part
is
arranged for supporting the first part relative to the casting surface, and
wherein the second
part is able to be interchanged with either a different second part or the
same second part
when inverted to selectively support the anchor at a range of different
heights relative to
the casting surface. More preferably, each different second part is able to
selectively
support the anchor at two different heights relative to the casting surface by
inverting the
second part. Even more preferably, each second part is marked on opposite
sides to
represent a height at which the anchor is supported when the second part is
used in
conjunction with the first part, with the second part being in a non-inverted
and/or an
inverted configuration.

Preferably, the chair is adapted for supporting a void former when fitted to
the
anchor. More preferably, the chair has one or more arms which extend to
directly support
the void former.

Preferably, the chair is adapted to support a reinforcement mesh of the
concrete
component. More preferably, the chair includes an insert for supporting the
reinforcement
mesh. Even more preferably, the chair includes a range of inserts which are
interchangeable for supporting the reinforcement mesh at different heights
relative to the
anchor.
Brief Description of the Drawings

The invention is described, by way of non-limiting example only, with
reference to
the accompanying drawings in which:

Figure 1 is a perspective view of a lifting anchor having a collar;


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Figure 2 is a perspective view of the anchor of Figure 1, shown with an
associated
chair;

Figure 3 is a perspective view of the anchor, shown with the chair fitted
thereto;
Figure 4 is a side view of the anchor, with the chair fitted thereto;

Figure 5 is a top view of the anchor, with the chair fitted thereto;
Figure 6 is a perspective view of the chair shown in isolation, in a
deconstructed
condition;

Figure 7 is a perspective view of an edge of a concrete component with the
anchor
embedded therein;

Figure 8 is a head portion end perspective view of another anchor, shown in
place
relative to a chair for supporting the anchor;

Figure 9 is a body portion end perspective view of the anchor and chair shown
in
Figure 8;

Figure 10 is a top view of the anchor and chair shown in Figures 8 and 9;
Figure 11 is a side view of the anchor and chair shown in Figures 8 to 10;

Figure 12 is a head portion end view of the anchor and chair shown in Figures
8 to
11;


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Figures 13a to 13d show various views of the anchor of Figures 8 to 12, shown
in
place relative to a chair for supporting the anchor, the chair also supporting
a tension bar of
the anchor;

Figure 14 is a perspective view of the chair shown in Figures 13a to 13d,
shown
with a pair of inserts for supporting a reinforcement mesh of the concrete
component;
Figure 15 is a perspective view of the chair of Figure 14, shown with the
inserts in
place and supporting a reinforcement mesh;
Figure 16 is a side view of the chair of Figure 14 with inserts in place,
supporting
the reinforcement mesh;

Figure 17 is a perspective view of the chair of Figure 14 shown with an
interchangeable insert of a different height;

Figure 18 is a side view of the chair and insert of Figure 17, shown
supporting the
reinforcement mesh at a different height relative to the anchor;

Figures 19a to 19d are perspective, side, top and end views of a chair
supporting an
anchor, together with a void former fitted to the anchor;

Figures 20a to 20d are perspective, side, top and end views of an alternative
chair
shown supporting an anchor, together with a void former fitted to the anchor;
and

Figures 21 a to 21 d are perspective, side, top and end views of a further
alternative
chair shown supporting an anchor, together with a void former fitted to the
anchor.


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Detailed Description

With reference to Figure 1, there is shown an anchor 10 for use in lifting a
concrete
component 12. The anchor 10 shown is in the form of an edge lift anchor,
however it will
be appreciated by those skilled in the art that alternative examples may be
used with other
types of anchors such as, for example, a face lift anchor.

The anchor 10 comprises a single length of wire 14 bent to form a head portion
16
engagable with a clutch of a lifting system, and a body portion 18 for
embedment with the
concrete component 12. The wire 14 is bent such that opposed legs 20, 22 of
the body
portion 18 extend in a plane substantially perpendicular to a plane of the
head portion 16.
By virtue of the wire 14 being bent in this way, the anchor 10 is able to be
arranged such
that the opposed legs 20, 22 lie in a plane substantially parallel to a
central plane of the
concrete component 12, while the head portion 16 is oriented substantially
perpendicularly
to the central plane of the concrete component 12. Advantageously, this
enables the
anchor 10 to be located lower in the concrete component 12 to facilitate edge
lifting of the
concrete component 12, while facilitating a broad spread of the opposed legs
20, 22 within
the concrete component 12.

As the legs 20, 22 are spread outwardly from a central axis 24, the load
applied to
the anchor 10 is distributed through a larger region of the concrete component
12 than is
possible with a typical concrete anchor having parallel legs. Accordingly,
this reduces the
likelihood of the concrete component 12 failing during lifting, as a large
region of the
concrete component 12 must fail for the anchor 10 to be torn out during
lifting. Each of
the legs 20, 22 may be formed with a wave-like configuration by incorporating
a series of
ripple bends to provide additional anchorage of the anchor 10 within the
concrete
component 12. Advantageously, the ripple bends prevent the legs 20, 22 from
being
withdrawn from the concrete, by applying compression to the concrete during
lifting. As
such, the opposed legs 20, 22 are able to provide the same function as
ancillary tension
bars which have been used in existing lifting anchors.


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To achieve the perpendicular configuration, the head portion 16 in the example
shown is twisted through an angle of 270 degrees relative to the body portion
18 about the
central axis 24 of the anchor 10. In alternative anchors, to achieve a
perpendicular
configuration the head portion may be twisted through an angle of 90 degrees
(or, more
generally, an angle of 90 + 180x, where x is a whole number) relative to the
body portion
18 about the central axis 24 of the anchor 10. The central axis 24 is in the
plane of the
head portion 16. In this way, the plane of the head portion 16 is
perpendicular to the plane
of the body portion 18.

It will be understood that in alternative examples, the body portion 18 may be
rotated about the central axis 24 relative to the head portion 16 such that
the plane of the
body portion 18 is out of the plane of the head portion 16 by an angle other
than 90
degrees. In particular alternatives, this angle may be approximately 60, 45,
30 or 15
degrees, as may be appropriate depending on the shape and/or orientation of
the concrete
component 12.

The head portion 16 of the anchor 10 may also be tilted upwardly/downwardly
out
of the plane of the legs 20, 22. This tilting of the head portion 16 may be
achieved by
bending the anchor on site, and may be advantageous when using the anchor 10
to lift
concrete components having angled edges. In particular examples, the edge of
the
concrete panel may be at an angle of 9 degrees, 15 degrees, 22.5 degrees, 30
degrees or 45
degrees to a plane perpendicular to the central axis 24, and the head portion
16 may be
bent relative to the legs 20, 22 at a corresponding angle.

The anchor 10 includes a collar 26 adapted to fit around the head portion 16,
as
shown in Figure 1. The collar 26 forms abutment shoulders 28 at upper and
lower
locations of the head portion 16 for cooperation with a body of the clutch to
limit clutch
rotation relative to the anchor 10.

More specifically, the collar 26 includes an attachment portion 58 for
attaching the
collar 26 to the lifting anchor 10, and an abutment portion 60 adapted to
provide a clutch


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abutment surface for limiting rotation of a clutch relative to the lifting
anchor 10. The
attachment portion 58 is arranged for attaching the collar 26 to the head
portion 16 of the
lifting anchor 10. When the collar 26 is fitted to the anchor 10, the clutch
abutment surface
is formed as an abutment shoulder 28 adjacent each side of the head portion 16
for limiting
rotation of the clutch about an eye 62 of the head portion 16, in both
directions of rotation.
The collar 26 may include a gap 64 between the shoulders 28 which coincides
with the eye
62 of the head portion 16 to allow passage of the clutch through the eye 62.

The collar 26 is generally C-shaped, including a pair of clasps for coupling
to
opposed wire lengths of the head portion 16, with a connecting strip 66
between the clasps.
Each clasp terminates in a tab 68 which secures the collar 26 to the head
portion 16 by way
of a hard press fit. The abutment portion 60 is formed by an edge of the
collar 26, at each
of the clasps.

The collar 26 includes a pair of shear bars 30, 32 attached to the collar 26. -
The
shear bars 30, 32 extend generally perpendicularly to the central axis 24,
generally in the
plane of the body portion 18. These shear bars 30, 32 assist in preventing
shear failure of
the concrete component 12 during lifting, and provide improved anchorage of
the anchor
10 within the concrete component 12. Each of the shear bars 30, 32 is formed
in a
generally wave-like shape, with lateral oscillations 34 in a direction
generally
perpendicular to the central axis 24 of the anchor 10. A second one of the
shear bars 30 is
located under a first one of the shear bars 32, and is reversed such that the
second shear bar
is substantially a mirror image of the first shear bar 32 when viewed from an
end of the
anchor 10. The shear bars 30, 32 may be positively held in place relative to
the head
25 portion 16 by engagement of the shear bars 30, 32 within grooves 36 formed
in the collar
26. The grooves 36 formed on opposite sides of the collar 26 may be formed in
a
correspondingly offset configuration so as to positively locate the shear bars
30, 32 in the
arrangement shown. Alternatively, the shear bars 30, 32 may be fixed relative
to the head
portion 16 by spot welding of the shear bars 30, 32 to the collar 26.


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The applicant has determined that the collar 26 is particularly suited for use
in
providing a concrete component lifting anchor formed of bent wire with clutch
abutment
surfaces for limiting rotation of a clutch relative to the lifting anchor.
This is because there
is not the same ability in providing anchors formed of bent wire with
shoulders as there is
with anchors cut from plate. However, it is possible for collars formed in
accordance with
other examples of the present invention to be used with anchors formed from
plate, and
such collars may provide various advantages over cut abutment shoulders. In
particular,
using a collar according to an example of the present invention provides the
ability to
interchange collars to change the size/shape of abutment shoulders, and
provides a
convenient way to attach shear bars to the anchor.

The collar 26 is preferably formed of metal, in particular from folded steel.
In
other examples, the collar may be formed from plastic.

Returning to the actual anchor itself, the length of wire 14 from which the
anchor
10 is formed may be a length of metal bar which is bent to form the anchor 10.
The length
of metal bar may be drawn from a coil. Advantageously, by virtue of the anchor
10 being
formed from metal bar, material wastage is minimised, and the anchor 10 is
manufactured
in a particularly cost-effective manner.
In particular, the head portion 16 is formed by bending the metal bar around a
forming piece, the forming piece being a pin having a size corresponding to
the size of a
clutch portion to pass through the head portion 16. By virtue of this forming
process, any
variation in the dimensions (particularly the diameter) of the metal bar will
not alter the
size of the aperture in the head portion 16. Accordingly, it is possible to
provide a superior
tolerance for an effective, rigid coupling between the clutch and the anchor,
thus avoiding
a sloppy coupling between the anchor and the clutch. In other words, variation
in the wire
does not affect quality of engagement between the anchor and the clutch.

Also, by virtue of the anchor 10 being formed of from round cross-section
metal
bar, there is a single point of contact between the clutch portion and the
anchor 10,


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avoiding the problems associated with skewed prior art anchors cut from metal
plate which
tend to transfer undesirable forces to the concrete component 12.

With reference to Figure 2, the anchor 10 forms part of an anchor assembly 38
which includes a chair 40. The chair 40 comprises a first, upper, part 44 and
a second,
lower, part 46 which are fitted together, with the first part 44 having clips
48 for holding
the anchor 10 in place relative to the chair 40, as shown in Figures 3 to 5.
Figure 6 shows
a detailed view of the first part 44 and the second part 46 in isolation. As
the body portion
18 is in a plane perpendicular to the plane of the head portion 16, when in
situ the opposed
legs 20, 22 do not extend below the head portion 16, thus allowing the anchor
10 to be
mounted in a relatively low position within the concrete component 12, while
ensuring the
opposed legs 20, 22 are embedded inside the concrete component 12. More
particularly,
the chair 40 is arranged for supporting the anchor 10 within the concrete
component 12
during casting, with the plane of the body, portion 18 coplanar or oriented
substantially
parallel to a central plane of the concrete component 12.

By virtue of the plane of the body portion 18 being coplanar with or
substantially
parallel to a central plane of the concrete component 12, it is possible for
the body portion
18 to be located at or within a neutral axis of the concrete component 12 so
as to avoid
having the anchor embedded in regions of the concrete component 12 which are
under
high compression and/or tension during lifting. This may assist in avoiding
failure of the
concrete component 12 during lifting, and may enable lifting of concrete
panels at a stage
more premature (relative to the time of casting) than is required for lifting
using existing
concrete anchors.
Furthermore, the feature of the plane of the body portion 18 being coplanar
with or
substantially parallel to the central plane of the concrete component 12
enables the anchor
to be used with concrete panels much thinner than is required for lifting
using existing
concrete anchors which extend transversely across a substantial portion of the
thickness of
the panel.


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Figure 7 shows an edge of a concrete component 12 in which the anchor 10 is
embedded. A void 56 is formed around the head portion 16, and facilitates
engagement of
a clutch with the anchor 10 for lifting of the concrete component 12. Although
in this
drawing the anchor 10 is shown as being mounted in a central part of the
concrete
component 12, it will be appreciated by those skilled in the art that the
anchor 10 may be
mounted within the concrete component 12 in a lower location such that the
plane of the
body portion 18 is below the central plane of the concrete component 12.

Advantageously, the chair 40 has surfaces in the form of the clips 48 and feet
70
configured for supporting the anchor 10 relative to a casting surface during
casting of the
concrete component 12. Where the chair 40 is used including its second part
46, the
surfaces configured for supporting the anchor also include upper and lower
surfaces 72, 74
of the foot spacers 76. The first and second parts 44, 46 are configured to
support the
anchor 10 relative to the casting surface at a first height using the first
part 44 on its own,
or in conjunction with the second part 46 to provide a range of further
heights. This is
achieved by supporting the anchor 10 using the first part 44, the feet 70 of
which sit
directly on the casting surface, or by using the second part 46 in the manner
shown in
Figures 3 and 4. The first and second parts 44, 46 may be used in conjunction
in this
configuration to support the anchor at a second height relative to the casting
surface, and in
another configuration in which the second part 46 is inverted so as to support
the anchor 10
at a third height relative to the casting surface. As can be seen in Figures 2
and 3, the
second part 46 is marked on opposite sides to indicate a height at which the
anchor 10 is
supported when the second part 46 is used in conjunction with the first part
44, with the
second part being in a non-inverted and/or an inverted configuration. In
particular, the
markings indicate the height at which the anchor 10 is supported when the
respective side
of the second part 46 faces upwardly.

As can be seen in the side view of Figure 4, the chair 40 is configured to
support
the anchor 10 such that the longitudinal central axis 24 of the anchor 10 is
substantially
parallel to the casting surface. In this way, the anchor 10 is oriented
correctly for lifting of
the concrete component 12 by the head portion 16 after casting. In the example
shown in


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Figures 3 to 5, the anchor 10 is supported by the chair 40 such that the body
portion 18 of
the anchor 10 has a plane oriented substantially parallel to the casting
surface. In contrast,
in the example shown in Figures 8 to 12, the anchor 10 is supported by the
chair 40 such
that the body portion 18 of the anchor 10 has a plane oriented substantially
perpendicular
to the casting surface. The anchor 10 shown in Figures 8 to 12 is a typical
edgelift anchor
formed from plate by a process of cutting, however it may be supported by a
chair 40
formed in accordance with the present invention in the manner shown. Like
features are
denoted with like reference numerals.

As the anchor 10 shown in Figures 8 to 12 is cut from plate and is
substantially
planar such that the head portion 16 and body portion 18 rest in the same
plane, it is
necessary for the plane of the body portion 18 to be substantially
perpendicular to the plane
of the casting surface in order for the head portion 16 to have the correct
orientation for
lifting of the concrete component 12. Accordingly, the first part 44 is formed
with slots 78
so as to support the anchor 10 in this perpendicular orientation. The first
part 44 is also
provided with holders 80 for holding the shear bars 30, 32 in configuration.
In this way the
shear bars 30, 32 are held in place sufficiently without spot welding to the
collar 26 as in
the example shown in Figures 1 to 7.

Although Figures 8 to 12 do not show a second part 46 of the chair 40, a
second
part 46 similar to the one shown in Figures 2 to 6 may be used.

The casting surface may be a ground surface against which the concrete
component
is formed, or an underlying surface (eg. of another concrete component) which
is used as a
surface for forming the concrete component in which the anchor 10 is to be
embedded.

Advantageously, the chair 40 provides an apparatus which enables convenient
height adjustment of the anchor 10 relative to the casting surface so that it
can be
embedded at a desired location within the concrete component 12. The second
part 46 is
able to be interchanged with other second parts to provide different heights
relative to the
casting surface. Each second part 46 may be configured asymmetrically in a
manner


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similar to the second part 46 shown in Figures 2 to 6, so as to provide two
different heights
relative to the casting surface by inversion.

While various embodiments of the present invention have been described above,
it
should be understood that they have been presented by way of example only, and
not by
way of limitation. It will be apparent to a person skilled in the relevant art
that various
changes in form and detail can be made therein without departing from the
spirit and scope
of the invention. Thus, the present invention should not be limited by any of
the above
described exemplary embodiments.
In particular, although the example anchor depicted in the drawings has an
angle
between the plane of the legs and the plane of the head portion of
approximately 90
degrees, it will be understood that in alternative examples the angle between
the plane of
the legs and the plane of the head portion may take other values, for example
60, 45, 30 or
15 degrees. This angle may be dictated by the shape and/or orientation of the
concrete
component.

With reference to Figures 13a to 13d, the anchor 10 cut from metal plate
material
may be provided with a tension bar 82, and the chair 40 may have angled clips
84 for
supporting the tension bar 82. As shown in these drawings, the anchor 10 may
be provided
with only a single shear bar 30, and the chair 40 may be provided with only a
single set of
holders 80 for holding the shear bar 30.

With reference to Figures 14 to 18, the chair 40 may be provided with one or
more
inserts 86 for supporting a reinforcement mesh 88 of the concrete component.
The inserts
86 may be shaped so as to be inserted into the feet 70 of the chair 40, as
shown. With
reference to Figures 15 and 16, when the inserts 86 are mounted in place on
the chair 40,
upper surfaces 90 are arranged so as to support the reinforcement mesh 88. As
can be
seen, the inserts 86 are arranged such that the upper surfaces 90 support the
reinforcement
mesh 88 approximately midway between the legs of the anchor 10. However, in
some
circumstances, it may be desirable to support the reinforcement mesh 88 at a
different


CA 02781471 2012 0522
WO 2010/063061 PCT/AU2009/001540
-14-
location relative to the anchor 10, and the inserts 86 may be interchangeable
with one or
more other inserts 92 as shown in Figures 17 and 18. The interchangeable
inserts may be
in two pieces as shown in Figures 14 to 16, or may be joined in a single
piece, as shown in
Figures 17 'and 18. With reference to Figure 18, the insert 92 is arranged
such that the
upper surfaces 90 support the reinforcement mesh 88 substantially in line with
an upper
surface of the anchor 10.

Figures 19a to 19d show a chair 40 in accordance with a variation, wherein the
chair 40 includes a plurality of support arms 94 for supporting a void former
96 mounted
to the head portion 16 of the anchor 10. The support arms 94 support the void
former 96 in
such a way that the void former 96 can be removed from the chair 40 after
casting of the
concrete component, thereby leaving a void for inserting a lifting clutch
through the eye of
the head portion 16. Figures 20a to 20d show an alternative chair 40 which has
support
arms 94 configured to extend from the holders 80 for supporting the void
former. Figures
21a to 21d show a further alternative chair 40 which has support arms 94
arranged to
support the void former 96 at various locations at an underside of the void
former 96.
Advantageously, this then does not place differential movement between the
anchor
and the void former through movement of the reinforcement mesh, as has
occurred
previously through the anchor body only being tied to the mesh via shear and
tension bars.
The chair provides direct localised support to the mesh at the anchor location
and as such
eliminates this differential movement whilst also eliminating the need for
custom bent
chairs under the anchor and under the mesh which all have different heights.
The drawings
show mesh supported as most common typical central mesh and then also
supporting top
mesh over the lifter in the case of two layers of mesh. In the case of two
layers of mesh
the bottom mesh is under the anchor and hence is not supported by the anchor -
only the
top mesh would be.

In previous systems, void formers are supported from the sideforms while the
anchor body is connected to the mesh causing differential movement between the
anchor
body and void former including differential height placement and torsion
between the two.


CA 02781471 2012 0522
WO 2010/063061 PCT/AU2009/001540
- 15-

This then results in movement away from the perfect design fit and causes poor
clutch fit
into the panel's edge in engagement with the anchor. This is currently a
substantial
problem in the industry. However, by supporting the anchor and void former
together in
perfect fit by the chair, this problem is eliminated.
The reference in this specification to any prior publication (or information
derived
from it), or to any matter which is known, is not, and should not be taken as
an
acknowledgment or admission or any form of suggestion that that prior
publication (or
information derived from it) or known matter forms part of the common general
knowledge in the field of endeavour to which this specification relates.

Throughout this specification and the claims which follow, unless the context
requires otherwise, the word "comprise", and variations such as "comprises"
and
"comprising", will be understood to imply the inclusion of a stated integer or
step or group
of integers or steps but not the exclusion of any other integer or step or
group of integers or
steps.

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

For a clearer understanding of the status of the application/patent presented on this page, the site Disclaimer , as well as the definitions for Patent , Administrative Status , Maintenance Fee  and Payment History  should be consulted.

Administrative Status

Title Date
Forecasted Issue Date 2018-01-02
(86) PCT Filing Date 2009-11-25
(87) PCT Publication Date 2010-06-10
(85) National Entry 2012-05-22
Examination Requested 2014-11-24
(45) Issued 2018-01-02

Abandonment History

Abandonment Date Reason Reinstatement Date
2015-11-25 FAILURE TO PAY APPLICATION MAINTENANCE FEE 2016-09-29

Maintenance Fee

Last Payment of $125.00 was received on 2023-10-30


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Next Payment if standard fee 2024-11-25 $624.00
Next Payment if small entity fee 2024-11-25 $253.00

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Payment History

Fee Type Anniversary Year Due Date Amount Paid Paid Date
Application Fee $400.00 2012-05-22
Maintenance Fee - Application - New Act 2 2011-11-25 $100.00 2012-05-22
Maintenance Fee - Application - New Act 3 2012-11-26 $100.00 2012-11-15
Maintenance Fee - Application - New Act 4 2013-11-25 $100.00 2013-11-12
Request for Examination $800.00 2014-11-24
Maintenance Fee - Application - New Act 5 2014-11-25 $200.00 2014-11-25
Reinstatement: Failure to Pay Application Maintenance Fees $200.00 2016-09-29
Maintenance Fee - Application - New Act 6 2015-11-25 $200.00 2016-09-29
Maintenance Fee - Application - New Act 7 2016-11-25 $200.00 2016-09-29
Registration of a document - section 124 $100.00 2017-11-14
Final Fee $300.00 2017-11-15
Maintenance Fee - Application - New Act 8 2017-11-27 $200.00 2017-11-17
Maintenance Fee - Patent - New Act 9 2018-11-26 $400.00 2018-12-11
Maintenance Fee - Patent - New Act 10 2019-11-25 $250.00 2018-12-11
Maintenance Fee - Patent - New Act 11 2020-11-25 $125.00 2020-10-08
Maintenance Fee - Patent - New Act 12 2021-11-25 $125.00 2021-11-17
Maintenance Fee - Patent - New Act 13 2022-11-25 $125.00 2022-11-17
Maintenance Fee - Patent - New Act 14 2023-11-27 $125.00 2023-10-30
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
PRE-FORM SYSTEMS DOO
Past Owners on Record
CASNE VERIGE PTY LTD
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Abstract 2012-05-22 1 77
Claims 2012-05-22 3 93
Drawings 2012-05-22 21 2,628
Description 2012-05-22 15 654
Representative Drawing 2012-05-22 1 110
Cover Page 2012-08-03 1 64
Final Fee 2017-11-15 2 69
Representative Drawing 2017-12-01 1 71
Cover Page 2017-12-01 1 109
Relief Mechanism 2018-07-23 2 215
Office Letter 2018-07-31 2 65
Small Entity Declaration 2019-02-21 3 577
PCT 2012-05-22 10 444
Assignment 2012-05-22 4 102
Correspondence 2012-07-12 1 21
Prosecution-Amendment 2012-10-12 2 43
Examiner Requisition 2016-10-14 3 190
Prosecution-Amendment 2014-11-24 1 35
Amendment 2017-04-13 10 350
Claims 2017-04-13 2 47