Note: Descriptions are shown in the official language in which they were submitted.
SELF -UNDERCUT EXPANSION ANCHOR SYSTEM WITH BORE
CUTTERS
FIELD
The invention relates to the field of anchors, and more
specifically to a self-undercut expansion anchor system
having improved bore cutters for use in cementuous materials.
SUMMARY
The present disclosure provides a self-undercut expansion
anchor system for use in a pre-drilled bore hole, comprising
an anchor further comprised of at least two angular cutters
positioned at a lower end of the anchor and separated by a
slit, to cut through a material of the pre-drilled bore hole;
and, a bullet connected to the anchor to provide a surface on
which the cutters positioned at a lower end of the anchor can
expand and radially cut into the pre-drilled bore hole,
wherein the lower end of the anchor expands radially over the
bullet to set the system in the pre-drilled bore hole.
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BRIEF DESCRIPTION OF THE DRAWINGS
The following figures serve to illustrate various embodiments
of features of the disclosure. These figures are illustrative
and are not intended to be limiting.
Figure 1 is a perspective exploded view of an improved
expansion anchor and a bullet, according to an embodiment of
the present disclosure;
Figure 2 is a perspective view of the bullet secured within
the improved anchor, according to an embodiment of the present
disclosure;
Figure 3 is a bottom view of the anchor, according to an
embodiment of the present disclosure;
Figure 4 is an enlarged front cutaway view a lower portion of
the anchor, according to an embodiment of the present
disclosure;
Figure 5 is a front cutaway view of a setting tool being
inserted into the anchor and the bullet to be in turn inserted
into a bore hole, according to an embodiment of the present
disclosure;
Figure 6,is a front cutaway view of the setting tool engaged
within the anchor, the anchor and bullet being positioned
into the bore hole before drilling has begun, according to an
embodiment of the present invention;
Figure 7 is a front cutaway view of the setting tool being
hammered and drilled within the anchor, the anchor spreading
over the bullet during the setting of the anchor, according
to an embodiment of the present invention;
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Figure 8 is a front cutaway view of the anchor set in an
undercut position within the pre-drilled bore hole and the
setting tool being removed from the anchor after drilling has
been completed, according to an embodiment of the present
invention;
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DETAILED DESCRIPTION
The following embodiments are merely illustrative and are not
intended to be limiting. It will be appreciated that various
modifications and/or alterations to the embodiments described
herein may be made without departing from the disclosure and
any modifications and/or alterations are within the scope of
the contemplated disclosure.
With reference to Figures 1, 2 and 3 and according to an
embodiment of the present disclosure, a self-undercut
expansion anchor system 10 for use in a pre-drilled bore holes
is shown, preferably comprising an improved anchor 15 and a
bullet 20. The anchor 15 is further comprised of at least two
angular cutters 25 positioned at a lower end of the anchor
15. Although this preferred embodiment describes four cutters
25, a worker skilled in the art would understand that any
number of cutters are possible, although four cutters have
been shown to be optimal. A worker skilled in the art would
appreciate that the cutters 25 could be in the form of brazed
carbide on the anchor 15, without departing from the scope of
the disclosure. The anchor 15 is also comprised of at least
two, and preferably four, slits 30 positioned at the lower
end of the anchor 15. As shown, the four slits 30 are
positioned equidistantly from one another on the anchor 15.
The slits 30 run up along the length of the anchor 15, from
the lower end of the anchor 15 until approximately halfway up
the anchor 15. As shown, the slits 30 are preferably
positioned in between adjacent cutters 25. A worker skilled
in the art would appreciate that the slits 30 allow for the
lower end of the anchor 15 to spread radially over the bullet
20 during setting of the anchor 15. In another embodiment of
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the anchor 15, an annular recess may be positioned in the
area where the slit terminates halfway up the anchor 15. Such
an annular recess may facilitate the spreading of the cutters
25 and the lower end of the anchor 15 positioned below the
such an annular recess. The anchor IS is also comprised of at
least one locking aperture 31 positioned at an upper end of
the anchor 15. Such a locking aperture 31 facilitates mating
with a setting tool (not shown). As specifically shown in
Figure 2, the anchor 15 has a partially threaded hollow inner
diameter 32 to receive the setting tool (not shown), a fixture
(not shown), or the bullet 20 as described below. Indeed, a
bullet 20 is shown connected to the anchor 15, the bullet 20
preferably bell-shaped and further comprising a neck 35 and
a trapezoid-shaped body 40 terminating in a cone-shaped tip
45. The neck 35 of the bullet 20 is connected to and positioned
within the lower end of the anchor 15, as specifically shown
in Figure 2. As will be described, during the setting of the
anchor 15, the lower end of the anchor 15 spreads radially
over the body 40 of the bullet 20 to secure the anchor 15 and
the bullet 20 within the bore hole.
With reference to Figure 4 and according to an embodiment of
the present disclosure, one of the cutters 25 of the anchor
15 is shown in greater detail. As shown, each cutter 25 has
a sloped cutting surface 50, each sloped cutting surface 50
having an optimal cutting angle 0 of at least 50. The optimal
cutting angle 0 has been shown to perform optimally when
cutting and boring through the cementuous material of the
pre-drilled bore hole, to optimize the strength of the anchor
15 and optimally set the anchor 15 in an undercut position in
the pre-drilled bore hole. In an alternate embodiment, the
sloped cutting surface 50 could slope from each side and
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terminate to form a notch or triangular shape, provided that
each taper is at least 50.
With reference to Figure 5 and according to an embodiment of
the present disclosure, the bullet 20 is shown connected to
the anchor 15, with a setting tool 80 about to be inserted
within the hollow inner diameter 32 of the anchor 15. In turn,
the anchor 15 and bullet 20 are about to be inserted within
the bore hole 85.
With reference to Figures 6, 7 and 8, the anchor 15 is shown
being set over the bullet 20 and within the bore hole 85.
With specific reference to Figure 6, the anchor 15 and bullet
20 are within the bore hole 85. Meanwhile, the setting tool
80 is inserted within the hollow inner diameter 32 of the
anchor 15, and the neck 35 of the bullet 20 is connected to
the lower end of the anchor 15. The cutters 25 have not yet
cut or bore into the cementuous material. With specific
reference to Figure 7, a hammer drill or other impact tool as
known in the art acts on the setting tool 80 to hammer and
rotate the setting tool 80 and in turn the anchor 15. As the
anchor 15 is driven downwardly into the bore hole 85, the
lower end of the anchor 15 begins to expand over the bullet
20. The slits (not shown) facilitate the expansion of the
anchor 15 over the bullet 20, and the cutters 25 cut and bore
through the cementous material to enlarge in the pre-drilled
bore hole 85. With specific reference to Figure 8, the anchor
15 has been maximally expanded over the bullet 20 and is set
in an undercut position. As shown in this undercut position,
the diameter of the set anchor 15 is wider than the diameter
of the pre-drilled bore hole 85 and thusly secured therein.
The setting tool 80 is removed from the hollow inner diameter
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32 of the anchor 15 and an operator can then insert a threaded
component, such as a fixture, into the anchor 15.
Many modifications of the embodiments described herein as
well as other embodiments may be evident to a person skilled
in the art having the benefit of the teachings presented in
the foregoing description and associated drawings. It is
understood that these modifications and additional
embodiments are captured within the scope of the contemplated
disclosure which is not to be limited to the specific
embodiment disclosed.
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