U.S. patent application number 14/643472 was filed with the patent office on 2015-10-22 for ledger board to rim board connector.
The applicant listed for this patent is Eric W. Johnson, Gary H. Koblasz. Invention is credited to Eric W. Johnson, Gary H. Koblasz.
Application Number | 20150299999 14/643472 |
Document ID | / |
Family ID | 54321544 |
Filed Date | 2015-10-22 |
United States Patent
Application |
20150299999 |
Kind Code |
A1 |
Koblasz; Gary H. ; et
al. |
October 22, 2015 |
Ledger Board to Rim Board Connector
Abstract
A bracket includes a connector rod for mounting through aligned
openings in a rim board of an original building structure and
through the ledger board of an adjacent add-on building structure.
The connector rod includes a stabilizer end of a length extending
beyond the rim board and ledger board for connection to a support
structure displaced from the rim board and ledger board. The
fasteners there against the rim board, the ledger board, and a
third fastener is displaced from the rim and ledger boards for
connection to a supported structure.
Inventors: |
Koblasz; Gary H.; (Smyrna,
GA) ; Johnson; Eric W.; (Atlanta, GA) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Koblasz; Gary H.
Johnson; Eric W. |
Smyrna
Atlanta |
GA
GA |
US
US |
|
|
Family ID: |
54321544 |
Appl. No.: |
14/643472 |
Filed: |
March 10, 2015 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
61995770 |
Apr 21, 2014 |
|
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|
Current U.S.
Class: |
52/703 ;
52/745.21 |
Current CPC
Class: |
E04B 1/003 20130101;
E04C 3/00 20130101 |
International
Class: |
E04B 1/00 20060101
E04B001/00; E04C 3/00 20060101 E04C003/00; E04B 1/61 20060101
E04B001/61 |
Claims
1. A bracket for mounting through aligned openings in a rim board
of an original building structure and in a ledger board of an
adjacent add-on building structure, said bracket comprising a
connector rod for mounting through the aligned openings formed in
the rim board of the original building structure and through the
ledger board of the adjacent add-on building structure, said
connector rod including a stabilizer end of a length for extending
beyond the rim board and ledger board for connection to a
supportive structure displaced from said rim board and ledger
board, fasteners positioned on said rectilinear connector rod, a
first of said fasteners positioned on said connector rod for
bearing against the rim board, a second of said fasteners
positioned on said connector rod for bearing against the ledger
board, and a third of said fasteners positioned on said connector
rod displaced from the rim board and the ledger board for
connecting the stabilizer end to a supportive structure displaced
from said rim and ledger boards.
2. The bracket of claim 1 wherein said third fastener is positioned
at a distance from the rim board and the ledger board to resist
pivoting of said connector rod.
3. The bracket of claim 1, wherein said third fastener is
positioned on said connector rod to connect the connector rod to
the add-on building structure at a position spaced from said ledger
board.
4. The bracket of claim 1, wherein said third fastener is
positioned to connect the connector rod to the original building
structure at a position spaced from said rim board.
5. The bracket of claim 4 wherein said first fastener and said
second fastener hold said ledger board and said rim board at a
predetermined distance from each other.
6. The bracket of claim 1, wherein said connector rod is at least
one foot long.
7. The bracket of claim 1, wherein the distance from the stabilizer
end of said connector rod to the next adjacent fastener is at least
six inches.
8. The bracket of claim 1, wherein said fasteners include a washer
for facing said rim board and said ledger board.
9. The bracket of claim 1, wherein fasteners include a cylindrical
spacer positioned about the connector rod sized for fitting into an
opening of the rim board or the ledger board that is of a larger
breadth than the breadth of said the connector rod for reducing the
likelihood of application of contact of the connector rod to the
exterior cladding of the original building structure.
10. A double shear bracket for mounting through aligned openings in
a rim board of an original building structure and in a ledger board
of an adjacent add-on building structure, said bracket comprising a
rectilinear connector rod of a length sufficient to mount through
the aligned openings formed in the rim board of the original
building structure and the ledger board of the adjacent add-on
building structure, and said connector rod including a stabilizer
end of a length for extending away from the rim board and the
ledger board for connection to a supportive structure displaced
from the rim board and ledger board, three cylindrical fasteners
mounted about said rectilinear connector rod, a first of said
fasteners positioned about said connector rod at a position for
bearing against the rim board, a second of said fasteners
positioned about said connector rod at a position for bearing
against the ledger board, and a third of said fasteners positioned
about the stabilizer end of the connector rod and displaced from
the rim board and the ledger board for connecting the stabilizer
end to a supportive structure displaced from the rim board and the
ledger board.
11. The double shear bracket of claim 10 wherein said third
fastener is positioned to connect the connector rod to the original
building structure at a position spaced from said rim board.
12. The bracket of claim 10 wherein said rim board and ledger board
have vertical surfaces that face away from each other, and wherein
said first and second fasteners engage the opposite facing surfaces
and urge the ledger board toward the rim board.
13. The bracket of claim 10, wherein said connector rod is at least
one foot long.
14. The bracket of claim 10, wherein the distance from the
stabilizer end of said connector rod to the next adjacent fastener
is at least six inches.
15. The bracket of claim 10, wherein said fasteners include washers
for facing said rim board and said ledger board.
16. The bracket of claim 15, wherein said washers further include
cylindrical spacers positioned about the opening of the washer and
sized-for fitting into an opening of the rim board or the ledger
board that is of a larger breadth than the breadth of said the
rectilinear connector rod for reducing the likelihood of
application of vertical force by the connector rod directly to the
exterior cladding of the original building structure.
17. The bracket of claim 15, wherein said washers further include
holes for receiving screws extending through the holes and
extending into the ledger board and rim board.
18. A method of connecting an add-on building structure to an
original building structure, comprising forming a rim opening in
the rim board of the original building structure, forming a ledger
opening in the ledger board of the add-on building structure that
is aligned with the rim opening in the original building structure,
inserting a connector rod through both the aligned rim opening and
ledger opening that includes a stabilizer end that reaches beyond
the rim board and ledger board to form a stabilizer end spaced away
from the rim board and ledger board, applying fasteners on the
rectilinear connector rod at a positions that straddle and engage
the rim board and ledger board and hold the rim board and ledger
board in closely spaced relationship, and connecting the stabilizer
end of the connector rod to a support structure displaced from said
rim board and ledger board at a distance to resist pivoting of the
connector rod.
19. A bracket mounted through aligned openings in a rim board of an
original building structure and in a ledger board of an adjacent
add-on building structure, said bracket comprising a rectilinear
connector rod extending through the aligned openings formed in the
rim board of the original building structure and extending through
the ledger board of the adjacent add-on building structure, and
said connector rod including a stabilizer end of a length for
extending beyond the rim board and ledger board for connection to a
supportive structure displaced from said rim board and ledger
board, fasteners mounted on said rectilinear connector rod, a first
of said fasteners including a cylindrical sleeve positioned on said
connector rod extending into the opening in the rim board and a
washer positioned against the rim board, a second of said fasteners
including a cylindrical sleeve positioned on said connector rod
extending into the opening in the ledger board and a washer
positioned against the ledger board, and a third of said fasteners
positioned at said stabilizer end of said connector rod displaced
from the rim board and the ledger board and connecting the
stabilizer end to a supportive structure displaced from said rim
and ledger boards,
20. The bracket of claim 19 wherein said rim board and ledger board
have opposite facing surfaces that face away from each other, and
wherein said fasteners engage the opposite facing surfaces of said
rim board and said ledger board and urge the ledger board toward
the rim board.
21. The bracket of claim 20, wherein said connector rod is at least
one foot long.
Description
PRIORITY
[0001] Applicants claim priority to U.S. Provisional Patent
Application Ser. No. 61/995,770, filed in the U, S. Patent &
Trademark Office on Apr. 21, 2014.
SUMMARY OF THE INVENTION
[0002] This invention concerns a method and apparatus for attaching
building structures together. More particularly, this invention
concerns a double shear point bracket with a stabilizer extension
that may be used for attaching the ledger board of a deck, patio,
porch or of other add-on building structures to a rim board of an
adjacent original building structure. And the invention also
concerns a method of attaching the bracket between the
structures.
BACKGROUND OF THE INVENTION
[0003] A typical building structure may include a horizontal rim
board that extends about and is supported by the foundation of the
building. The floor, roof, ceiling framing, and exterior cladding
of the building are referred to herein as the "original building
structure". When a deck or other add-on building structure is to be
added to the exterior of the original building structure, the
add-on building structure may include a ledger board that is to
extend adjacent and parallel to the rim board of the original
building structure. The ledger board can be mounted to and
supported by the rim board of the original building structure. In
this arrangement, the ledger board supports the portion of the
add-on building structure that is adjacent the original building
structure.
[0004] Usually both the rim board and ledger board are formed of
wood and the connection of the ledger board of the add-on building
structure to the rim board of the original building structure is
made with brackets or dowel type connectors, typically bolts or
screws. The load from the floor of the add-on building structure is
transferred to its ledger board, then from the ledger board to the
bolts of the bracket, then from the bolts of the bracket to the rim
board of the original building structure.
[0005] The exterior cladding of a typical original building
structure may include, but is not limited to brick masonry, stone
masonry, stucco, exterior insulating finishing system ("EIFS"), or
siding. The exterior cladding usually is removed from the original
building structure at the point of mounting the ledger board of the
add-on building structure to the rim board of the original building
structure, so the ledger board of the deck may be located close to
the rim board, making contact with the wall sheathing or rim
board.
[0006] In some cases, it is desirable to space the ledger board of
the add-on building structure away from the supporting original
building structure to avoid removing the adjacent exterior cladding
of the original building structure. This may be done for water
proofing reasons or to avoid supporting the exterior cladding above
the ledger board.
[0007] Usually, exterior cladding of the original building
structure is not intended to be a load carrying element, and recent
building codes have begun to explicitly address this. If the
exterior cladding is not removed and the ledger board of the add-on
building structure is separated farther from the rim board of the
original building structure to leave space for the exterior
cladding, the connector bracket must span farther through an
unsupported gap between the two buildings. The gap may include a
space or the non-structural wall cladding. This extra length of the
connector bracket weakens the strength of the connections between
the buildings.
[0008] A conventional "single shear" connector bracket may be used
to mount the ledger board to a rim board of joined building
structures. The connector bracket has two contact points, one at
the rim board and the other at the ledger board. Pivoting of the
connector bracket by the load of the add-on building applied to the
connector bracket is resisted by a non-uniform compression stress
distribution between the connector bracket and the wood of the rim
and ledger boards. This potential failure mode is known as "mode
II" in the National Design Specification for Wood Construction, as
illustrated herein in FIG. 1.
[0009] When the ledger board of the add-on building structure is
attached to the rim board of an original building structure and the
boards are in contact with one another, or very close to one
another, the length of the single shear connector bracket extending
between the rim and ledger boards is relatively short and a high
shear load from the ledger board to the rim board can be
transferred through the connector bracket.
[0010] But when the structures are separated by a wider unsupported
gap, the length of the connector bracket extending between the rim
and ledger boards must be greater and the maximum compression
stress on the wood of the structures by the single shear connector
bracket becomes higher as the connector begins to pivot. The result
is the add-on building structure is not supported at an acceptable
level.
[0011] Prior art U.S. patents of Jewell U.S. Pat. No. 4,953,339 and
Eldeen U.S. Pat. No. 7,254,926, and Smith Patent Application
Publication 2014/0215956 A1 disclose devices that span through a
pre-assembled structure to a rim board with an unsupported gap
there between. However, none of the known prior art could be easily
installed as a retrofit in an application where the ledger board
and framing of the add-on building structure are already assembled
and existing. Additionally, the structural mechanics of these prior
art devices are not adequately addressed or realized, including
whether each contact point is designed as: "Roller", whereby
translation is resisted in one direction but rotation is not
significantly resisted; "Pinned", whereby translation is resisted
in all directions but rotation is not significantly resisted (which
is characteristic of most conventional screwed or bolted
connection); or "Fixed", whereby translation is resisted in all
directions and rotation or moment is resisted. As a result, some
prior art devices include complex features that are not necessary
for structural purposes.
[0012] U.S. Pat. No. 7,254,926 to Eldeen discloses a connector
composed of a rod with a sleeve at the end of a rod. The nature of
the sleeve design and its use in an application with only two
contact points suggests that a fixed connection at the sleeve was
intended and realized. However, in an application where the rod has
three contact points, fixity at the sleeve connection is redundant
and unnecessary. Eldeen describes an option where the rod has a
third contact point, but apparently fails to realize that fixity at
this third contact point is unnecessary. Resisting moment at this
connection point requires the sleeve to be of thick material,
highly specialized, difficult to install, and expensive.
Additionally, Eldeen exclusively locates the third contact point on
the side of the supporting structure opposite the ledger board.
This third contact point could be located both the side of the
ledger board opposite the supporting structure and the side of the
supporting structure opposite the ledger board.
[0013] U.S. Pat. No. 4,953,339 to Jewell and U.S. Patent
Publication 2014/0215956 A1 to Smith disclose larger devices with
two contact points. The large custom size of these devices is
necessary to facilitate a fixed connection at the rim board. This
moment transfer appears to cause rotation of the rim board when
vertical loads are applied on the deck. Preventing rotation of the
rim board is dependent on the connection at the top and bottom of
the rim board, which may be existing and impossible to reasonably
verify. Additionally, the large size of these devices appears to
require significant removal of exterior cladding to install.
[0014] Eldeen, Jewell, and Smith disclose a vertical plate behind
the ledger board as a component of the connector device. These
plates serve to transfer lateral load from the ledger board through
the connector, via compression, to the rim board. Without these
plates, it appears that the ledger board could move freely into the
gap when subjected to a lateral load towards the supporting
structure. In a retrofit application, it would be difficult to
install these components without rebuilding the deck.
[0015] Thus, it is an object of this invention to provide an
improved connector to support a ledger board of an add-on building
structure on a rim board of an adjacent original building structure
that can span through an unsupported gap between the buildings.
Other objects of this invention include providing a double shear
connector bracket with a stabilizer extension that can transfer
load about all space axes between joined buildings, can avoid fixed
or moment resistant connections, can avoid or reduce significant
removal of exterior cladding, can be more easily installed as a
retrofit, uses readily available materials of readily available
shapes, and does not require unconventional support of the joists
attached to the ledger board.
SUMMARY OF THE INVENTION
[0016] A connector and method of attaching a ledger board to a
supporting structure are disclosed. The connector is described as a
double shear bracket with a stabilizer extension that is
constructed to span through an unsupported gap between building
structures and transfer loads about all three space axes from the
ledger board to the supporting structure. The unsupported gap may
consist of air or material not designed to support a load.
Typically, the material not intended to support a load would
consist of exterior cladding, including, but not limited to,
siding, stucco, exterior insulating finishing system (EFS), or
masonry veneer.
[0017] The double shear bracket is used for mounting through
aligned openings in a rim board of an original building structure
and in a ledger board of an adjacent add-on building structure, so
that the facing portion of the add-on building structure is
supported by the original building structure. The stabilizer
extension maintains the bracket in its desired attitude, usually in
a horizontal attitude.
BRIEF DESCRIPTION OF THE DRAWINGS
[0018] FIG. 1 is an example of a single shear failure mode II from
National Design Specification for Wood Construction. (Prior
art.)
[0019] FIGS. 2A, 2B, 2C, 2D, 2E, and 2F are free-body-diagrams of
add-on building structures with three general options for a
statically determinant connector spanning through an unsupported
gap between building structures. (Prior art)
[0020] FIG. 3 is a side cross sectional view of the adjacent
portions of an original building structure and an add-on building
structure such as, but not limited to, a deck joined rim board to
ledger board by a double shear bracket with a stabilizer extension,
with the stabilizer extension of the bracket extending away from
the rim board and ledger board and supported within the add-on
building structure.
[0021] FIG. 4 is a side cross sectional view of the adjacent
portions of an original building structure and the add-on building
structure that are joined rim board to ledger board by the double
shear bracket, similar to FIG. 3, but with the stabilizer extension
of the bracket extending away from the rim board and ledger board
and supported within the original building structure.
[0022] FIG. 5A is a side view of a washer and nut shown threaded
onto the connector rod of the bracket.
[0023] FIG. 5B is a side view of a washer, cylindrical sleeve, and
nut shown installed over the connector rod of the bracket.
[0024] FIG. 5C is an end view of the washer and nut of FIG. 6A and
FIG. 6B.
[0025] FIG. 6A is a side view of a washer and cylindrical sleeve
shown mounted over the connector rod of the bracket.
[0026] FIG. 6B is an end view of the washer and cylindrical sleeve
of FIG. 7A.
[0027] FIG. 7 is an internally and externally threaded cylindrical
sleeve shown threaded onto the connector rod of the bracket.
[0028] FIG. 8 is an expanded view of a washer and screw in
alignment with a connector rod of the bracket.
[0029] FIG. 9 is a cylindrical sleeve, with its ends cut at 90
degrees, shown mounted over the connector rod of the bracket.
[0030] FIG. 10 is a cylindrical sleeve, with its ends cut at an
angle, shown mounted over the connector rod of the bracket.
[0031] FIG. 11A is side view of washer shown mounted over the
connector rod of the bracket.
[0032] FIG. 11B is an end view of the washer of FIG. 11A an
optional feature of washer openings for receiving screws.
[0033] FIG. 12 is a side view of a threaded rod adhered to a
connector.
DETAILED DESCRIPTION
[0034] Generally, there are three options that exist for creating a
statically determinant connector that can span through an
unsupported gap to support a ledger board (see FIGS. 2A-2F):
[0035] Option 1: As shown in FIG. 2A, the connector has two contact
points. The contact point at the supporting structure, henceforth
referred to as contact point A, is fixed. The contact point at the
ledger board, henceforth referred to as contact point B, is pinned.
The contact point at the end of the joists supported by the ledger
board, hence forth referred to as contact point D, which
approximately aligns with contact point B, is in a different plane,
is pinned, which conforms with the conventional method of attaching
joists to the ledger board (i.e. conventional joist hangers) and is
not shown in the drawing.
[0036] Option 2: As shown in FIG. 2B, the connector has two contact
points. Contact point A is pinned. Contact point B is fixed.
Contact point D is fixed, which is not the conventional method of
attaching joists to the ledger board.
[0037] Option 3: As shown in FIG. 2C-FIG. 2F, the third contact
point is introduced to the connector, henceforth referred to as
point C. Contact point A is pinned or roller. Contact point B is
pinned or roller. Contact point C is pinned or roller. Contact
point D is pinned, which is the conventional method of attaching
joists to the ledger board. Contact point C could be located on
either the side of the ledger board opposite the supporting
structure (Option 3.1 and Option 3.2) or the side of the supporting
structure opposite the ledger board, shown in FIG. 2D (Option 3.3
and Option 3.4).
[0038] FIG. 3 illustrates an original building structure 10 and an
add-on building structure 12 that is to be connected to the
original building structure. A connector bracket 14 connects the
original building structure to the add-on building structure.
[0039] A conventional original building structure may include
parallel floor joists 16 and flooring 18 mounted on a foundation
wall 20 and studs 22 supported by the floor joists and rim board
30. A sheathing 24, such as plywood or OSB, may be applied to the
stud wall and an exterior cladding 26 such as a brick veneer may be
applied to the original building structure, usually with an
internal air space 28 formed between the exterior cladding and the
stud walls and the other exterior wall covering. Rim board 30
surrounds most of the original building structure and is supported
by the foundation wall. The rim board supports parts of the
building structure above the lower wall foundation in the
conventional structure.
[0040] The add-on building structure 12, that may be in the form of
a conventional outdoor deck, is positioned adjacent the outdoor
cladding of the original building structure, such as the brick
veneer 26. The add-on building structure includes a ledger board 32
that is placed parallel to the rim board of the original building
structure, and parallel joists 34 mounted to the ledger board.
Flooring 36 is supported by the joists 34, in the usual manner.
[0041] In order to prepare the original and add-on building
structures for mounting the add-on building structure to the
original building structure, the add-on building structure may be
positioned adjacent the original building structure as shown in
FIG. 3. An opening is drilled through the exterior cladding 26,
such as brick veneer, through the sheathing 24, through the rim
board 30, and any other structural members to form a cylindrical
opening entirely through the wall structure.
[0042] Likewise, an opening of similar dimensions is formed through
the ledger board 32 of the add-on building structure 12. The add-on
building structure 12 in this embodiment of the invention is an
outdoor deck that includes the ledger board 32 with parallel deck
joists supported thereby. The opening through the ledger board is
aligned with the opening through the rim board.
[0043] The connector bracket 14 includes a rectilinear connector
rod 40 that may be formed with external or internal spiral threads
extending along its length or positioned at certain contact points
along the rod. The connector rod that may be comprised of, but not
limited to, steel, aluminum, or fiber reinforced polymer is
extended through the aligned openings formed in the rim board of
the original building structure and extending through the ledger
board of the adjacent add-on building structure. The connector rod
is of a length to include a stabilizer extension that extends
beyond the connection between the building structures to a
supportive structure displaced from the rim board and ledger board.
Preferably, the connector rod is of a length sufficient to extend
over six inches from the ledger board. However, the connector rod
may be shortened if desired, thereby increasing rod shear forces,
increasing rod bearing forces, and decreasing rod deflection, or
lengthened if desired, thereby decreasing rod shear forces,
decreasing rod bearing forces, and increasing rod deflection.
[0044] The stabilizer end 48 of the connector rod extends through a
supportive structure 50 that is displaced from the rim board and
ledger board, out between adjacent joists of the add-on building
structure 12. The supportive structure can be blocking mounted at
its ends to adjacent joists with an opening through the blocking
with the connector rod extending through or up to the opening and
attached thereto with a suitable nut, etc.
[0045] The supportive structure 50 at the stabilizer end of the
connector rod maintains the connector rod 40 at a fixed height and
attitude extending away from the rim board 30 and ledger board 32,
and holds the ledger board 32 at a position where its opening is
aligned with the opening of the rim board 30. This tends to avoid
any pivoting movement of the rectilinear connector rod 40. The
supportive structure prevents the stabilizer end 52 from tilting
vertically or horizontally (or translating axially depending on the
type of fastener used--described further below), thereby
maintaining the ledger board in proper alignment with the rim board
of the original building structure.
[0046] FIG. 4 illustrates the bracket mounted in a reversed
position from that illustrated in FIG. 3. The stabilizer end 52
extends inwardly of the original building structure 10, between the
floor joists 16 and through the supportive structure 50. The
supportive structure prevents the stabilizer end 52 from tilting
vertically or horizontally (or translating axially depending on the
type of fastener used--described further below), thereby
maintaining the ledger board in proper alignment with the rim board
of the building structure.
[0047] FIG. 5-FIG. 12 illustrate different types of fasters that
can be mounted to the connector rod 40 at the rim board 30, ledger
board 32, and supportive structure 50 to maintain the connector rod
and add-on building in its desired position and altitude. All
fasteners transfer load (from the rod to rim board, ledger, or
supportive structure) both vertically and horizontally. It is for
this reason that even simple sleeve type components or bearing
elements are referred to herein, as fasteners. Some fasteners
transfer axial load, while others do not transfer axial load and
allow axial translation.
[0048] FIG. 5A illustrates a washer and nut. The nut 60 includes
internal threads that engage external threads 62 of the connector
rod 40. The washer 61 provides an enlarged surface for applying
compressive forces to the rim board or ledger board or supportive
structure. This connection would allow axial translation in one
direction only, as the rim board, ledger, or supportive structure
could be pulled away from the washer and slide along the connector
rod 40.
[0049] If resistance to axial translation was required in both
directions then a secondary nut and washer could be installed on
the opposing face of the rim board, ledger, or supportive
structure.
[0050] In some cases it may not be possible to install this
secondary nut and washer, for example if an existing ledger is held
tight against existing exterior cladding. Alternatively, the washer
61 could include small holes 64 around the perimeter edge and could
be adhered to the nut. Small screws would be driven through the
holes 64 in the washer 61 into the ledger. In this case, as the
ledger pulls away from the washer, the screws would be loaded in
withdrawal and would engage the washer, nut, and rod.
[0051] FIG. 5B illustrates a similar connector, however a sleeve 63
is added to the nut and washer. The sleeve 63 may be cylindrical
and effectively enlarges the diameter of the connector rod 40 and
extends into the opening of the rim board, ledger board, or
supportive structure to which the fastener is mounted.
[0052] In order to avoid load being transferred from the rod 40 to
the exterior cladding 26 (when loads are applied to the add-on
building structure 12 and the rod 40 deflects) the hole in the
exterior cladding would ideally be made of larger breadth than the
breadth of the connector rod. However, if the add-on building and
original building are already existing, it would be difficult to
only over-drill the hole in the exterior cladding 26, without also
over-drilling the holes in the ledger board 32 or rim board 30. The
cylindrical sleeve 63 provides a means to over-drill the hole
through the ledger board, exterior cladding, and rim board, while
making contacting at only the desired locations. Over-drilling the
hole in the exterior cladding 26 also provides a space to apply an
impermeable material, such as caulk or silicon, between the rod 14
and exterior cladding 26 to prevent leakage of air or water into
the interior of the original building structure.
[0053] FIGS. 6A, 6B and 6C illustrate a similar connector, but with
only a washer 70 with small holes 72 around the perimeter and a
cylindrical sleeve 71. The washer and cylindrical sleeve would be
adhered to each other. The washer and/or cylindrical sleeve could
also be adhered to the connector rod 40 and eliminate the need for
the nut. Alternatively, the washer and cylindrical sleeve could not
be adhered to the rod and would then allow axial translation. The
rod 40 in this embodiment could be threaded or unthreaded.
[0054] FIG. 7 illustrates a sleeve 81 that is both internally
threaded and externally threaded. The internal threads of the
sleeve engage external threads 62 of the connector rod 40, while
the external threads 82 of the sleeve 81 engage the wood ledger
board, rim board, or supporting member. The sleeve includes a
hexagonal head 80 to provide a means to install/turn the sleeve.
The internal threads and external threads of the sleeve would
ideally be of similar pitch (meaning a given rotation of the sleeve
around the connector rod would correspond to a similar translation
along the connector rod). Otherwise, the external threads 82 of the
sleeve might not properly set in the wood of the ledger board, rim
board, or supporting member.
[0055] FIG. 8 illustrates a screw and washer. The screw 90 includes
external threads 91 that engage internal threads 93 of the
connector rod 40. The washer 92 provides an enlarged surface for
applying compressive forces to the rim board, ledger board, or
supportive structure. The openings in the ledger board and rim
board would remain aligned; however, the opening in the board
receiving the screw would be of a smaller breadth to accommodate
the smaller diameter of the screw 90, not the larger diameter of
the connector rod 40. In this application, the connector rod 40
would not pass through the board, but rather would extend to the
face of the board. The screw 91 would pass through the board.
[0056] FIG. 9 illustrates a cylindrical sleeve fastener 100 that is
installed around the connector rod 40 and adhered to the connector
rod. The sleeve 100 would contact the ledger board, rim board, or
supporting structure, but the rod 40 would not. Without additional
fasteners, this connection would allow axial translation as the
sleeve would be free to slide along the ledger board, rim board, or
supporting member.
[0057] FIG. 10 illustrates a similar fastener to that of FIG. 9,
however, the ends of cylindrical sleeve 101 are cut at an angle.
This connection would be well served at the ledger board 32 of FIG.
3. The distance from the wall sheathing 24 and ledger board 32
would not be the same on all structures. This distance could vary
by as much as 2'' on different original building structures. When
gravity loads are applied to the add-on building structure, the top
of the connector rod 40 makes contact with the top of the hole
drilled in the ledger board 32. While the bottom of the connector
rod 40 urges towards the bottom of the hole drilled in the exterior
cladding 26. The angled sleeve would provide a standard size
connector that could always contact the top of the hole drilled in
the ledger board 32, while never contacting the bottom of the hole
drilled in the exterior cladding 26.
[0058] FIGS. 11A and 11B illustrate a washer 110 to be installed
over the connector rod 40. The washer would be adhered to the rod
if axial translation is to be restrained, and free to slide along
the rod if axial translation is not to be restrained. Similar to
FIG. 5C, holes 111 could be drilled along to perimeter of the
washer to receive screws to be driven into the ledger board, rim
board, or supportive structure if axial translation is to be
restrained.
[0059] FIG. 12 illustrates a second rod 120 adhered to the
connector rod 40. The rod 120 is of a smaller breadth than the
connector rod 40 and includes external threads that would engage a
nut or external threads that would directly engage the wood of the
ledger board, rim board, or supporting member and eliminate the
need for a nut.
[0060] Another embodiment would include a connector rod 40 that is
installed at an angle, or is curved, so that it can be directly
attached to the side of a floor joist with screws or bolts. This
would eliminate the need for the blocking 50 shown in FIGS. 3 and
4.
[0061] The rectilinear connector rod is described as including
external or internal spiral threads and the fasteners are described
as including matching internal or external threads for mounting the
fasteners at the desired positions along the length of the
connector rod. It is also possible to form other shapes of the
connector rod and fasteners, such as, but not limited to, a bayonet
connection, ribs, or openings in the connector rod and fasteners
formed to match the ribs or openings.
[0062] While the expressions "rim board" and "ledger board" have
been used to describe the structural features of the connection
points of the add-on building structures and original building
structures, these expressions are to include other supporting
structures that are suitable for connection together by the
inventions disclosed herein.
[0063] Although preferred embodiments of the invention have been
disclosed in detail herein, it will be obvious to those skilled in
the art that variations and modifications of the disclosed
embodiments can be made without departing from the spirit and scope
of the invention as set forth in the following claims.
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