U.S. patent application number 12/258890 was filed with the patent office on 2010-04-29 for locking concrete insert.
This patent application is currently assigned to MITEK HOLDINGS, INC.. Invention is credited to Ronald P. Hohmann.
Application Number | 20100101175 12/258890 |
Document ID | / |
Family ID | 42116143 |
Filed Date | 2010-04-29 |
United States Patent
Application |
20100101175 |
Kind Code |
A1 |
Hohmann; Ronald P. |
April 29, 2010 |
LOCKING CONCRETE INSERT
Abstract
A locking insert is described for use in a poured concrete
structure. The locking insert includes a hollow elongated body, a
longitudinal channel with two configured side edges and a channel
floor, a paired gear nut and locking plate that interengages said
configured side edges, an attachment bolt, and a method to prevent
concrete from seeping into the locking insert. The embedment of the
locking insert into a concrete structure provides a positive
locking, positional and anti-slip method of attachment for a
structural or secondary element. The locking insert allows for
vertical positioning and locking of the paired gear nut and locking
plate to ensure a proper connection with a structural or secondary
element through an attachment bolt. The locking insert with an
attached outwardly projecting element transfers the load associated
with the structural or secondary element throughout the concrete
structure to allow for a high strength connection.
Inventors: |
Hohmann; Ronald P.;
(Hauppauge, NY) |
Correspondence
Address: |
SENNIGER POWERS LLP
100 NORTH BROADWAY, 17TH FLOOR
ST LOUIS
MO
63102
US
|
Assignee: |
MITEK HOLDINGS, INC.
Wilmington
DE
|
Family ID: |
42116143 |
Appl. No.: |
12/258890 |
Filed: |
October 27, 2008 |
Current U.S.
Class: |
52/698 ;
52/223.13 |
Current CPC
Class: |
F16B 37/046 20130101;
E04B 1/4107 20130101 |
Class at
Publication: |
52/698 ;
52/223.13 |
International
Class: |
E04B 1/41 20060101
E04B001/41 |
Claims
1. A locking insert for embedment in one face of a poured concrete
structure for attaching a structural or secondary element thereto,
said locking insert comprising: an elongated body having a hollow
interior and an exterior surface adapted, upon insertion into said
concrete structure, to be substantially coplanar with said face
thereof, a longitudinal channel in said exterior surface of said
elongated body providing an opening into said interior thereof,
said longitudinal channel further comprising: a channel floor
disposed opposite said opening; two configured sides of the channel
opening, said sides being parallel and coplanar the one with the
other, and; a paired threaded gear nut and locking plate for
disposition in said longitudinal channel and upon installation and
rotation interengages with said configured sides of said
longitudinal channel to secure said locking insert; whereby said
locking insert provides a positional slip-free attachment site for
said structural or secondary element.
2. A locking insert as described in claim 1, wherein said elongated
body further contains at least one attachment opening in said
channel floor, said attachment opening adapted for attachment to
formwork through the use of an attachment member.
3. A locking insert as described in claim 2, wherein said
attachment member is selected from a group consisting of nails,
screws and bolts.
4. A locking insert as described in claim 1, wherein an outwardly
projecting element extends from the exterior surface of the
elongated body opposite the opening of the longitudinal channel,
said outwardly projecting element adapted for insertion into the
concrete structure to more fully transfer the load associated with
said secondary or structural element.
5. A locking insert as described in claim 4, wherein said outwardly
projecting element is in the shape of a bolt.
6. A locking insert as described in claim 4, wherein said outwardly
projecting element is frustoconically shaped.
7. A locking insert as described in claim 1, wherein said elongated
body, said paired threaded gear nut and locking plate, and said
outwardly projecting element are constructed of material selected
from a group consisting of galvanized steel, hot dip galvanized
steel, stainless steel, cast malleable iron, and bright basic
steel.
8. A locking insert as described in claim 7, wherein said elongated
body is formed from a squared tube;
9. A locking insert as described in claim 1, wherein said paired
threaded gear nut and locking plate includes a gear nut portion
configured to interengage said longitudinal channel edges to
position said paired gear nut and locking plate.
10. A locking insert as described in claim 1, wherein the locking
plate portion of said paired threaded gear nut and locking plate
has a horizontal width greater than the width of said longitudinal
channel, to lock said paired gear nut and locking plate within said
longitudinal channel when an attachment bolt connects said gear nut
and locking plate with a secondary or structural connection.
11. A locking insert as described in claim 10, wherein said
attachment bolt includes a bolt head attached to one end of said
attachment bolt.
12. A locking insert as described in claim 10, wherein said
attachment bolt is attached to said paired threaded gear nut and
locking plate by welding.
13. A locking insert as described in claim 1, wherein said
configured sides are shaped in a shark tooth manner.
14. A locking insert as described in claim 1, wherein said
configured sides are shaped in an arcuate manner.
15. A locking insert as described in claim 1, wherein said
elongated body has end plates adapted to restrict entry of concrete
into said longitudinal channel.
16. A locking insert as described in claim 1, wherein said
longitudinal channel contains a removable filler, adapted to
restrict entry of concrete into said longitudinal channel, selected
from a group consisting of foam, rubber or removable plastic.
17. A locking insert as described in claim 1, wherein a force
emitting object is affixed to said locking plate portion, whereby
when said locking plate portion is inserted into said longitudinal
channel, said force emitting object engages said channel floor and
said paired gear nut and locking plate against said configured side
edges, thereby restricting movement.
18. A locking insert as described in claim 17, wherein said force
emitting object is a spring.
19. A locking insert for embedment in one face of a poured concrete
structure for attaching a structural or secondary element thereto,
said locking insert comprising: an elongated body having a hollow
interior and an exterior surface adapted, upon insertion into said
concrete structure, to be substantially coplanar with said face
thereof, a longitudinal channel in said exterior surface of said
elongated body providing an opening into said hollow interior
thereof, said longitudinal channel further comprising: a channel
floor disposed opposite said opening; two configured sides of the
channel opening, said sides being parallel and coplanar the one
with the other; and, a paired threaded gear nut and locking plate
for disposition in said longitudinal channel which, upon
installation and engagement, interengages with said configured
sides of said longitudinal channel to secure said locking insert;
whereby said locking insert provides a positional slip-free
attachment site for said structural or secondary element.
20. A locking insert as described in claim 19, wherein said
elongated body further contains at least one attachment opening in
said channel floor, said attachment opening adapted for attachment
to formwork through the use of an attachment member.
Description
FIELD OF THE INVENTION
[0001] This invention relates to a locking concrete insert for use
in a poured concrete structure. More particularly, this invention
relates to a positive locking concrete insert that provides a
heavy-duty, positional, and anti-slip mechanism to connect with
another structural or secondary element.
DESCRIPTION OF THE PRIOR ART
[0002] Concrete inserts are utilized in poured concrete structures
to connect structural or secondary elements thereto. In the past, a
widely accepted concrete insert employed an askew headed bolt set
in an elongated chamber. Although useful in allowing vertical
repositioning of the connecting bolt, the prior insert failed to
lock the bolt in a given vertical position. In some instances, the
lack of positive locking in the prior art devices resulted in
structural slippage and failure.
[0003] The use of poured concrete structures in the field of
construction known as tilt-up concrete construction is one of the
fastest growing building technologies in North America, with at
least 10,000 structures using this technology being built every
year. Tilt-up construction has been in existence for more than a
century and today constitutes more than 15% of industrial
buildings. Additional construction using poured-in-place concrete
slabs, ceilings and walls add to this large percentage.
[0004] This popularity is the result of the favorable inherent
characteristics of concrete which include strength, durability,
permeability and wear resistance. These characteristics provide
completed structures with all the energy efficiency, structural
strength, high thermal mass, fire resistance and durability
associated with concrete. Concrete construction is also
environmentally friendly because the structure is cast onsite,
minimizing transportation costs, and the high thermal mass of
concrete provides excellent insulation. Another benefit of concrete
construction is the speed of construction. While the panels are
under formation, the remaining building systems are readily
integrated into the overall structures. This results in shorter
overall construction times. All of these benefits are recognized by
builders in all areas of construction from relatively simple
single-level office buildings to the current construction of the
world's tallest building, the Burj Dubai, which is constructed of
reinforced concrete.
[0005] Poured concrete tilt-up structures are created horizontally
in large slabs using a form made of a material such as wood. The
form is coated with a lubricant to prevent the poured concrete from
adhering to the form. The form molds the concrete structure,
providing the shape and size, as well as the openings for doorways
and windows.
[0006] Poured concrete construction often requires concrete
structures to support other structural or secondary elements. Such
support is provided through concrete inserts embedded in the
concrete structure. The concrete inserts are positioned after the
form is constructed, by attaching the base of the insert into the
form, typically through a nail, screw or similar instrument, in a
manner that positions the outer face of the insert in a coplanar
fashion with the surface of the concrete. The remainder of the
insert is embedded within the concrete structure. After the form is
completed, concrete is poured into the form and allowed to cure.
Once the concrete is cured, the form is removed, leaving the
concrete insert embedded within the concrete wall and open for
connection with a structural or secondary element. According to the
Concrete Reinforcing Steel Institute, "formwork and its associated
labor is the largest single cost segment of the concrete structural
frame--generally more than 50%."
[0007] The use of positive-locking concrete inserts embedded within
the concrete structure also provides for greater safety for the
craftsman. There is no welding or cutting required and there are no
dangerous projections on the surface of the outer panel.
[0008] Prior art concrete inserts typically comprise an elongated
metal unit with a longitudinal opening that is capable of receiving
a nut and bolt set to secure brackets, angle beams or other modes
of attachment. The prior insert generally contains some extended
portion set within the concrete panel to transfer the attached load
through the nut and bolt into a large volume of concrete, thereby
providing maximum support. During the pouring of the concrete
panel, the longitudinal opening of the insert is filled with foam,
rubber, plastic or other removable substance to ensure that the
longitudinal opening thereof remains concrete free and ready to
accept the nut and bolt set.
[0009] As exact insert alignment seldom occurs, vertical
adjustability of the nut and bolt set is desirable for proper
mating of the support members. Longitudinal movement within the
concrete insert is essential because once the insert is embedded in
the concrete structure, the insert itself is generally immovable.
Although longitudinal movement is achieved through the use of the
elongated channel and bolt, the nut and bolt connection could
loosen and jeopardize the alignment of the structures, which could
cause failure.
[0010] In preparing for this application the below-mentioned
patents have become known to the inventors hereof.
TABLE-US-00001 Patent Inventor Issue Date 7,213,376 Pulkkanen, et.
al. May 8, 2007 5,729,951 Frohlich Mar. 24, 1998 5,625,993 Kelly
May 6, 1997 4,469,466 Hotz Sep. 4, 1984 4,235,560 Schimmel Nov. 25,
1980 4,073,329 Hala Feb. 14, 1978 4,021,991 Hotz May 10, 1977
4,009,549 Hala Mar. 1, 1977 1,933,536 Awbrey Nov. 7, 1933 1,854,277
Schatz Apr. 19, 1932
[0011] Exemplary of the development of the concrete insert into the
current state of the prior art, in a patent to Arthur J. Schatz,
U.S. Pat. No. 1,854,277 issued Apr. 19, 1932, entitled "Eccentric
Washer For Angle Supports," an adjustable washer used to allow
vertical movement of an angle support is taught. Schatz's patent
works with a bolt that is embedded in a concrete structure rather
than a bolt that is housed within an embedded insert. Further
development in S. C. Awbrey, U.S. Pat. No. 1,933,536 issued Nov. 7,
1933, entitled "Concrete Insert," provides for a housed modified
bolt that helps to restrict vertical movement and a modified nut
for use in ceiling inserts.
[0012] More recently, R. Hotz in U.S. Pat. No. 4,021,991 issued May
10, 1977, entitled "Fastening Device," describes a tapered nut that
wedges into shelf angles to prevent slippage and teaches the use of
external forces to prevent slippage. Further, a modified transition
bolt used to clamp together abutting side rails of a pair of
edge-to-edge concrete wall panels, is taught by V. Schimmel in U.S.
Pat. No. 4,235,560 issued Nov. 25, 1980.
[0013] Other methods of attaching and locking structures to
anchoring structures are described in the prior art in patents such
as D. Kelly in U.S. Pat. No. 5,625,993 issued May 6, 1997, entitled
"Concrete Structure Having Load Transferring Insert and Method For
Making Same," which discloses a load transferring V-shaped nut and
longitudinal bolt that restricts rotation within the insert, and K.
Frohlich in U.S. Pat. No. 5,729,951 issued Mar. 24, 1998, entitled
"Anchoring Device for the Construction Industry," which provides
attachment of anchors to an anchor rail by means of plastic
deformation of the anchor rail and/or the anchor.
[0014] Other concrete inserts have improved positioning capability.
Exemplary of this is J. Pulkkanen in U.S. Pat. No. 7,213,376 issued
May 8, 2007, entitled "Bracket for Supporting Structural Element to
Support Structure," which teaches a moveable bracket part to allow
two-dimensional connection movement.
[0015] The development of a positional, anti-slip mechanism to
connect with another structural or secondary element is an area of
importance that needs to be more fully addressed. The present
assignees, Hohmann & Barnard, Inc., ("H&B"), having many
years and vast experience in the masonry and fastening fields have
received patents in related fields including A. Hala in U.S. Pat.
4,009,549 issued Mar. 1, 1977, entitled, "Stone Structural
Securement System and Method," which taught a method of
interconnection between the structural frame of an edifice and the
exterior masonry panels. Additionally, in 1978, A. Hala of H&B,
received another U.S. Pat. No. 4,073,329 issued Feb. 14, 1978, for
an invention entitled, "Wedge Shaped Lock Washer Construction and
Assembly." Hala's patent taught an adjustable washer and fastening
system that uses an interlocking wedging engagement system to lock
the adjoining members in place. H&B's devices have received
widespread usage in the industry. However, none of these devices
are designed to provide a complete locking high-load concrete
insert that will withstand large scale forces. Further, none of
these devices provide the versatility of use of the present
invention.
[0016] The present invention has varied applications that include,
but are not limited to, the following typical uses: providing a
brick relief angle at a concrete beam; providing a brick relief
angle at a concrete slab on a corrugated metal deck with a
pour-stop; providing a brick relief angle at a precast concrete
lintel; casting into the underside of a concrete slab to accept
partition wall restraint angles; welding to the underside of a
steel beam to accept a partition wall restraint angle; welding to
the web of a spandrel beam to accept a masonry wall restraint
anchor; casting into the underside of a concrete slab to accept
pipes, ductwork, etc.; providing a gravity or tieback insert in
precast panels; casting into radial concrete to accept handrails;
embedding into a fully grouted concrete masonry unit wall to accept
deadload or lateral anchors for stone, or precast veneers; and
casting into concrete walls to accept stone anchors.
[0017] Accordingly, while several distinct devices were developed
to assist in constructing a concrete structure, the current state
of the art does not fulfill the need for a positional, anti-slip
mechanism to connect with another structural or secondary element.
As described hereinbelow, the present invention employs a
specialized locking system that allows positional movement of the
nut, while maintaining a high-strength, anti-slip locked
connection.
SUMMARY
[0018] The present invention is composed of a solid material such
as steel or cast malleable iron formed into a squared tube. The
squared tube is altered to provide a longitudinal channel in the
device, which provides access to the hollow elongated body.
Additional elements such as end plates and outward projections can
also be affixed.
[0019] During construction, when formwork is used, the rear portion
of the base of the device is constructed with an attachment opening
to receive a nail, screw or other attachment instrument for use in
connecting the device to the formwork in a manner that positions
the base of the device in a coplanar fashion with the surface of
the concrete. The elongated body can be constructed with end plates
or can be filled with a removable protective insert to restrict
concrete from entering the longitudinal channel. Once the locking
insert is attached to the formwork, concrete is poured into the
structure and the locking insert is set in concrete. After the
concrete is set, any protective insert is removed and the
longitudinal channel is exposed. Further, this versatile device can
be welded to the underside of a steel beam to accept partition wall
restraint angles or welded to the web of a spandrel beam to accept
masonry wall restraint anchors.
[0020] The longitudinal channel contains a frictional gripping
cutout along the two configured sides that inversely matches and
interengages the frictional gripping cutout of the interengaging
portion of the gear nut. When the gear nut is paired with a locking
plate, it is inserted into the longitudinal channel either, through
the longitudinal channel, through a port, or by rotational
movement, and can be vertically positioned to the predetermined
location and set into place. Pairing of the gear nut and locking
plate occurs either through welding the gear nut to the locking
plate, machining the gear nut and locking plate, or manually
affixing the gear nut and locking plate through the use of an
attachment bolt. An attachment bolt is inserted through the paired
gear nut and locking plate to provide a means for connecting to a
secondary or structural connection. Additionally, an attachment
bolt can be formed with the single two-part gear nut and locking
plate to provide a single complete means for connecting to a
secondary or structural connection. Gear nut positioning assistance
is provided through a locating spring that is affixed to the
locking plate. Such locating spring pushes against the channel
floor and longitudinal channel, thereby holding the paired gear nut
and locking plate in place until it can be secured, by an
attachment bolt, to a secondary or structural connection.
[0021] In general terms, a locking insert device for a poured
concrete structure is disclosed hereby, which insert includes a
hollow elongated body with an opening in one face thereof forming a
longitudinal channel along the body and attaching hardware to mount
a structural element. The opening has configured side edges and the
attaching hardware is a novel paired gear nut and locking plate
that interengages the configured side edges and accepts an
attachment bolt. Upon installation, the locating spring, affixed to
the locking plate, secures the gear nut and locking plate in the
longitudinal channel at the desired location until the secondary or
structural connection is secured through an attachment bolt. A
means is provided to prevent wet concrete from seeping into the
locking insert. The locking insert is constructed of galvanized
steel, hot dip galvanized steel, stainless steel, cast malleable
iron, or bright basic steel. The interengagement of the locking
insert with the novel hardware provides anti-slip attachment and
positive locking and positioning for a structural or secondary
element onto a concrete structure.
[0022] The locking insert allows for vertical positioning and
locking of the gear nut and locking plate to ensure a proper
connection with a structural or secondary element through an
attachment bolt. Further, the locking insert with an attached
outwardly projecting element transfers the load associated with the
structural or secondary element throughout the concrete structure
to allow for a high strength connection.
BRIEF DESCRIPTION OF THE DRAWINGS
[0023] In the following drawings, the same parts in the various
views are afforded the same reference designators.
[0024] FIG. 1 is a perspective view of a first embodiment of this
invention showing a locking insert with a hollow elongated body
with end plates and outwardly projecting elements attached to the
elongated body embedded in a poured concrete structure, with the
paired gear nut and locking plate and attachment bolt set within
the longitudinal channel;
[0025] FIG. 2 is a cross sectional view of FIG. 1 taken along a
plane bisecting the concrete insert showing the paired gear nut and
locking plate and locating spring interengaged with the configured
side edges;
[0026] FIG. 3 is a perspective view of a rotating paired gear nut
and locking plate;
[0027] FIG. 4 is a perspective view of an arcuate paired gear nut
and locking plate;
[0028] FIG. 5 is a perspective view of an alternate design paired
gear nut and locking plate;
[0029] FIG. 6 is a perspective view of an alternate design paired
gear nut and locking plate;
[0030] FIG. 7 is a perspective view of a second embodiment of this
invention, similar to FIG. 1, but employing a longitudinal channel
with a port.
DETAILED DESCRIPTION OF THE DRAWINGS
[0031] In the embodiments described hereinbelow, the locking insert
employs an innovative design that combines the strength and design
of the paired gear nut and locking plate, the longitudinal channel
and the elongated body. The result of such design produces a
locking insert wherein the paired gear nut and locking plate
interengages the channel sides, providing a positional, positive
locking connection when secured to a secondary or structural
connection through an attachment bolt.
[0032] In poured concrete construction, shown in the embodiments
hereof, this locking insert provides a paired gear nut and locking
plate for use in attaching a structural or secondary element
through an attachment bolt. Further, the insert vertically locks
the structural or secondary element in place and prevents pullout
from the elongated body. The outwardly projecting element supports
the attached load by transferring and spreading such load
throughout the concrete mass containing the locking insert,
providing a high strength support system. Recent advancements in
concrete building construction, and its related gains in
popularity, demand such an easy to use, high strength, positional
and anti-slip locking connection to provide proper, efficient and
safe construction.
[0033] In a related sense, prior art concrete inserts provide a
method of attaching and positioning structural and secondary
elements. Although useful in providing a method of attachment with
the ability to reposition the attachment point, the prior art fails
to completely prevent slippage and to fully lock the connection. In
some instances, such shortcomings of the prior art resulted in
structural slippage and failure. Further, the prior art lacks the
versatility associated with the novel design and versatility of
this invention.
[0034] To address the two concerns, namely, positioning and
preventing bolt slippage and pullout, the inventor's innovative
locking insert employs a novel and unique paired gear nut and
locking plate that interengages with the longitudinal channel. The
first concern is addressed by the gear nut portion of the paired
gear nut and locking plate that interengages the configured edges
of the longitudinal channel in the elongated body. The gear nut
portion fits within the configured edges of the longitudinal
channel to allow vertical positioning. The latter concern is
addressed by the design of the locking plate portion of the paired
gear nut and locking plate which, when set within the longitudinal
channel and secured against a structural or secondary connection
with an attachment bolt, fully locks the paired gear nut and
locking plate within the heavy-duty, high strength elongated
body.
[0035] In the detailed description, the elongated body and the
paired gear nut and locking plate are constructed of carbon steel
or cast malleable iron.
[0036] Referring now to FIGS. 1 through 3, the first embodiment of
a locking insert of this invention set within a poured concrete
structure is shown and is referred to generally by the numeral 20.
In this embodiment, as shown in FIGS. 1 and 2, a hollow elongated
body 22 is shown having a longitudinal channel 24 in the front face
of the locking insert and end plates 26 and 28 on each end of the
elongated body. The longitudinal channel 24 contains a channel
floor 30 and parallel coplanar configured sides 32 and 34. The
configured sides 32 and 34 are formed in a shark tooth manner 42 to
interengage the paired gear nut and locking plate 38. No port is
required because the paired gear nut and locking plate 38 (as shown
in FIG. 3) is inserted through the longitudinal channel 24 with the
locking plate portion 41 of the paired gear nut and locking plate
38 parallel to the configured sides 32 and 34, rotated 90 degrees
and pulled into the longitudinal channel 24 opening until the shark
toothed gear nut portion 43 of the paired gear nut and locking
plate 38 is engaged with the configured sides 32 and 34.
[0037] The shark toothed paired gear nut and locking plate 38
engages the configured sides 32 and 34 of the longitudinal channel
24, providing an anti-slip method of attachment. The paired gear
nut and locking plate 38 works in conjunction with a locating
spring 39 to set the paired gear nut and locking plate 38 in place
prior to attachment to a secondary or structural connection through
an attachment bolt 44. As shown in FIG. 2, when the locating spring
39 is pressed against the channel floor 30 and the paired gear nut
and locking plate 38, the locating spring 39 sets the paired gear
nut and locking plate 38 within the longitudinal channel 24 and
against the configured sides 32 and 34. The paired gear nut and
locking plate 38 is set by the locating spring 39 until it can be
secured within the longitudinal channel 24 by an attachment bolt 44
to a secondary or structural connection.
[0038] Further, to allow attachment load transfer throughout the
concrete structure 40, the elongated body contains bolt head shaped
outwardly projecting elements 50, 52 and 54 that are secured deep
within the concrete structure 40 as shown in FIG. 1. The shape of
the outwardly projecting elements 50, 52 and 54 can take the form
of an array of attachments, including a frustoconical shape or any
other design that assists in transferring the attachment load
throughout the concrete member 40. The best mode of placement of
the outwardly projecting elements 50, 52 and 54 is one outwardly
projecting element for every six inches of elongated body 22,
however, lessening or adding other outwardly projecting elements
50, 52 and 54 is allowable. The locking insert 20 can be attached
to formwork through an attachment opening (not shown) in the
channel floor 30. The attachment opening provides a method of
attachment using nails, screws or the like to secure the locking
insert 20 against the formwork. An alternative design provides
another method of attachment (not shown) through the use of flange
members that project outwardly from the front face of the elongated
body 22.
[0039] The description that follows is of a second embodiment of
the locking insert. For ease of comprehension, where similar parts
are used reference designators "100", units higher are employed.
Thus, the outwardly projecting elements 150, 152 and 154 of the
second embodiment are analogous to the outwardly projecting
elements 50, 52 and 54 of the first embodiment.
[0040] Referring now to FIGS. 4 to 7, the second embodiment of a
locking insert of this invention consists of a hollow elongated
body 122 having a longitudinal channel 124 in the front face of the
locking insert and end plates 126 and 128 on each end of the
elongated body. The longitudinal channel 124 contains a channel
floor and parallel coplanar configured sides 132 and 134, and a
port 136. The port 136 can be located at any position, but the best
mode of manufacture is to locate the port at one end of the
longitudinal channel 124. The configured sides 132 and 134 are
formed in a shark tooth manner 142 to interengage the nut and the
chosen paired gear nut and locking plate assemblies 160 and 170, as
shown in FIGS. 5 and 6. The paired gear nut and locking plate of
the first embodiment 41 as shown in FIG. 3. is also matched to the
longitudinal channel 124 of this second embodiment.
[0041] The paired gear nut and locking plates for use with the
locking insert 122 can take numerous forms, but the best mode of
practice would be to either form the paired gear nut and locking
plate 160 as a single piece or as two separate pieces 170. The
paired gear nut and locking plate 160, as shown in FIG. 5, consists
of an interengaging shark toothed gear nut portion 162 to
interengage with the configured sides 132 and 134, a locking plate
164 and a locating spring (not shown). The paired gear nut and
locking plate 170, as shown in FIG. 6, consists of an interengaging
shark toothed gear nut portion 172 to interengage with the
configured sides 132 and 134, a separate locking plate portion 174
and a locating spring (not shown). Although, no port is required
because both paired gear nut and locking plates 160 and 170 can be
inserted through the longitudinal channel 124 and adjusted into the
proper location, a port is added to ease insertion into the
longitudinal channel 124. Once the front portion of the paired gear
nut and locking plate 162 and 172 is engaged with the longitudinal
channel 124, the locating spring is set against the channel floor
and the locking plate portion 164 and 174 thereby holding the
paired gear nut and locking plate in place until the secondary or
structural connection is set with an attachment bolt. This action,
completes the anti-slip locking action.
[0042] An alternative longitudinal channel design, employing
configured side edges containing an arcuate locking design (not
shown), will similarly interengage an alternative arcuate paired
gear nut and locking plate 180 as shown in FIG. 4. The arcuate
paired gear nut and locking plate 180 consists of three parts, an
interengaging arcuate gear nut portion 182, a locking plate 184,
either welded to the gear nut portion or placed as a separate
element, and a locating spring(not shown). The arcuate gear nut
portion 182 engages the configured sides of the interengaging
arcuate longitudinal channel, thereby locking the arcuate paired
gear nut and locking plate 180 and providing an anti-slip method of
attachment, when secured against a secondary or structural
connection with an attachment bolt. The locking plate 184 works in
conjunction with the locating spring. When the locating spring is
pressed against the channel floor and the locking plate 184, the
arcuate paired gear nut and locking plate 180 is set within the
longitudinal channel and against the configured sides, awaiting the
secondary or structural connection and attachment bolt that
completes the anti-slip locking action.
[0043] Further, to allow attachment load transfer throughout the
concrete structure, the elongated body contains bolt head shaped
outwardly projecting elements 150 and 152 that are secured deep
within the concrete structure. Outwardly projecting elements 150
and 152 can take the form of an array of attachments, including a
frustoconical shape or any other design that assists in
transferring the attachment load throughout the concrete member.
The best mode of placement of the outwardly projecting elements 150
and 152 is one member for every six inches of elongated body 122,
however, lessening or adding other outwardly projecting elements
150 and 152 is allowable.
[0044] The locking insert can be attached to formwork through an
attachment opening (not shown) in the channel floor. The attachment
opening provides a method of attachment using nails, screws or the
like to secure the elongated body 122 against the formwork. An
alternative design provides another method of attachment (not
shown) through the use of flange members that project outwardly
from the front of the elongated body 122.
[0045] An alternative elongated body design (not shown) is produced
without end plates 126 and 128. In an effort to lower costs, the
elongated body is filled with a removable insert consisting of
foam, plastic or rubber. The removable insert is placed in the
longitudinal channel prior to the pouring of the concrete, to
inhibit the wet concrete from seeping into the longitudinal channel
during the curing process. Once the concrete is cured, the
removable insert is lifted from the longitudinal channel to allow
insertion of a paired gear nut and locking plate into the
longitudinal channel. Because many varying and different
embodiments may be made within the scope of the inventive concept
herein taught and because many modifications may be made in the
embodiments herein detailed in accordance with the descriptive
requirement of the law, it is to be understood that the details
herein are to be interpreted as illustrative and not in a limiting
sense.
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