U.S. patent application number 10/708435 was filed with the patent office on 2004-08-26 for orifice sealing physical barrier.
This patent application is currently assigned to SIKA AUTOMOTIVE. Invention is credited to Davis, Robert B., Stratman, Randy.
Application Number | 20040164498 10/708435 |
Document ID | / |
Family ID | 25538249 |
Filed Date | 2004-08-26 |
United States Patent
Application |
20040164498 |
Kind Code |
A1 |
Stratman, Randy ; et
al. |
August 26, 2004 |
ORIFICE SEALING PHYSICAL BARRIER
Abstract
The present invention is a physical barrier for an orifice in a
panel member which includes a plastic carrier and a patch adapted
to adhere to the carrier and the panel member. The patch is
comprised of a heat-activated material. The patch is joined to a
portion of the plastic carrier and encapsulates a peripheral edge
of the plastic carrier. Joining the patch and the plastic carrier
preferably employs use of traditional vacuum-forming techniques.
The plastic carrier is attached to the panel member and the patch
is heated to generally flow. The patch cools and forms a seal
between the interface of the plastic carrier and the panel member
while a portion of the patch is disposed between the plastic
carrier and the panel member filling any gap therebetween.
Inventors: |
Stratman, Randy; (Rochester
Hills, MI) ; Davis, Robert B.; (Royal Oak,
MI) |
Correspondence
Address: |
RADER, FISHMAN & GRAUER PLLC
39533 WOODWARD AVENUE
SUITE 140
BLOOMFIELD HILLS
MI
48304-0610
US
|
Assignee: |
SIKA AUTOMOTIVE
30800 Stephenson Highway
Madison Heights
MI
|
Family ID: |
25538249 |
Appl. No.: |
10/708435 |
Filed: |
March 3, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10708435 |
Mar 3, 2004 |
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09992365 |
Nov 19, 2001 |
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6708979 |
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10708435 |
Mar 3, 2004 |
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PCT/US02/36308 |
Nov 13, 2002 |
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Current U.S.
Class: |
277/628 |
Current CPC
Class: |
B62D 25/24 20130101;
Y10S 277/931 20130101 |
Class at
Publication: |
277/628 |
International
Class: |
F16J 003/00 |
Claims
1. A physical barrier for an orifice in a panel member, comprising:
a plastic carrier having a peripheral edge; a patch adapted to
adhere to said plastic carrier and the panel member; and wherein
said patch is attached to at least a portion of said plastic
carrier and encapsulates said peripheral edge.
2. The physical barrier of claim 1, wherein said patch is
configured to seal an interface between said plastic carrier and
the orifice upon being heat-activated.
3. The physical barrier of claim 2, wherein a portion of said patch
is disposed between said plastic carrier and the panel member to
seal the plastic carrier and the orifice upon being
heat-activated.
4. The physical barrier of claim 1, wherein said carrier is adapted
to be attached to said panel member.
5. The physical barrier of claim 4, further comprising one or more
snap-fit fasteners mounted on said carrier and adapted to attach
said carrier to said panel member.
6. The physical barrier of claim 5, wherein said snap-fit fasteners
include a protrusion defining said peripheral edge of said plastic
carrier and having a bottom surface, said patch is wrapped around
said protrusion to encapsulate said peripheral edge and is attached
to said bottom surface.
7. The physical barrier of claim 5, wherein said snap-fit fasteners
include a lip defining said peripheral edge of said plastic carrier
and having a bottom surface, said patch is wrapped around said lip
to encapsulate said peripheral edge and is attached to said bottom
surface.
8. The physical barrier of claim 5, wherein said fasteners are a
plurality of S-shaped clips.
9. The physical barrier of claim 8, wherein said S-shaped clips
include a tail defining said peripheral edge of said plastic
carrier and having a bottom surface, said patch is wrapped around
said tail to encapsulate said peripheral edge and is attached to
said bottom surface.
10. The physical barrier of claim 1, wherein said patch comprises
10-40 wt % ethylene-vinyl acetate (EVA), 5-35 wt % styrene
butadiene rubber (SBR), 5-22 wt % talc, 10-45 wt % mica, and 10-30
wt % tall oil rosin.
11. The physical barrier of claim 8, wherein said patch comprises
29 wt % EVA, 16 wt % SBR, 12 wt % talc, 26 wt % mica, and 17 wt %
tall oil rosin.
12. A method of sealing an orifice in a panel member, comprising:
joining a patch made of a heat-activated material to a portion of a
plastic carrier such that the patch encapsulates a peripheral edge
of the plastic carrier; attaching the plastic carrier to the panel
member; and adhering the plastic carrier to the panel member with a
portion of the patch disposed between the plastic carrier and the
panel member.
13. The method of sealing an orifice of claim 12, wherein the
heat-activated material of the patch comprises 10-40 wt %
ethylene-vinyl acetate (EVA) and 5-35 wt % styrene butadiene rubber
(SBR), with the balance comprising fillers of talc, mica and tall
oil rosin.
14. The method of sealing an orifice of claim 13, wherein the
heat-activated material of the patch comprises fillers of 5-22 wt %
talc, 10-45 wt % mica, and 10-30 wt % tall oil rosin.
15. The method of sealing an orifice of claim 13, wherein the
heat-activated material of the patch comprises 29 wt % EVA, 16 wt %
SBR, 12 wt % talc, 26 wt % mica, and 17 wt % tall oil rosin.
16. The method of sealing an orifice of claim 12, wherein the
heat-activated material of the patch comprises 10-40 wt %
ethylene-vinyl acetate (EVA), 5-35 wt % styrene butadiene rubber
(SBR), 5-22 wt % talc, 10-45 wt % mica, and 10-30 wt % tall oil
rosin.
17. The method of sealing an orifice of claim 12, wherein joining
the patch to the plastic carrier includes vacuum-forming the patch
to the plastic carrier to encapsulate the peripheral edge of the
carrier.
18. The method of sealing an orifice of claim 12, wherein adhering
the plastic carrier to the panel member includes heating the patch
such that the heat-activated material of the patch generally
flows.
19. The method of sealing an orifice of claim 18, wherein heating
the patch includes heating at a temperature of about 175.degree.
Fahrenheit to about 400.degree. Fahrenheit.
20. The method of sealing an orifice of claim 18, further including
the step of curing the heat-activated material of the patch to form
a seal between the interface of the plastic carrier and the panel
member such that a portion of the patch is disposed between the
plastic carrier and the panel member.
Description
CROSS REFERENCE TO RELATED APPLICATIONS
[0001] This application claims priority as a Continuation-In-Part
to U.S. patent application Ser. No. 09/992,365 filed on Nov. 19,
2001 and Patent Cooperation Treaty Application No. PCT/US02/36308
filed on Nov. 13, 2002;
[0002] the contents of each are incorporated herein in their
entirety.
FIELD OF THE INVENTION
[0003] This invention relates to devices and methods for sealing
orifices in panel members.
BACKGROUND OF THE INVENTION
[0004] Physical barriers are commonly used to seal orifices in
certain objects, such as panel members in motor vehicles,
buildings, household appliances, etc. These barriers normally are
used to prevent physical materials, fluids, and gases, such as
environmental contaminants, fumes, dirt, dust, moisture, water,
etc., from passing through the orifice or cavity. For example, an
automotive panel, such as a door panel, typically has several small
orifices in the sheet metal, which are created for various reasons
during manufacturing. Further, various structural components of
automobile bodies have a variety of orifices, hollow posts,
cavities, passages and openings that can allow contaminants from
the engine and the roadway into the passenger compartment. These
holes, orifices, and cavities are typically barricaded with duct
tape, butyl-based plastic patches, and sealing plugs made from
foam, rubber or some other material. Another known physical barrier
for cavities involves introducing a foam product into the cavity,
and using a fiberglass matting to fill in the cavity.
[0005] One type of known physical barrier is a combination of a
metal carrier and a patch of heat flowable material. The metal
carrier is inserted into and retained in the orifice to be sealed.
Next, the patch is overlaid on the carrier and heated so as to form
a seal over the orifice. The metal carrier supports the center of
the patch so as to prevent the patch from collapsing into the
orifice. This solution is unsatisfactory for a number of reasons.
First, the metal carrier is difficult to install into the orifice.
Namely, a force multiplying tool and/or a machine is needed to
apply a large amount of force to sufficiently flex the retaining
means on the metal carrier to allow installation. Second, the metal
carrier is heavy while also being relatively expensive to
manufacture. The use of other materials for the carrier has
previously been limited because patch materials have not been
available which adhere to disparate materials. For example, known
patches adhere only to metal. Thus, previously both the panel
member and the carrier were required to be metal.
[0006] Further, when a carrier is inserted into and retained in the
orifice to be sealed, differences in material thicknesses often
produce a gap between the carrier and the panel member. With
traditional physical barriers, the patch is applied over the
carrier and thus any gap between the carrier and the panel member
remains. Thus, contaminants present in the gap are trapped.
Additionally, the gap may expand or retract under operating
conditions and thus produce a seal failure by separating the patch
from the panel member.
[0007] Accordingly, there is a need for a physical barrier that
produces an effective and robust seal about the orifice of the
panel member. Specifically, a physical barrier that overcomes the
possible seal failures associated with the gap between the carrier
and the panel member is greatly desired.
BRIEF SUMMARY OF THE INVENTION
[0008] The present invention is a physical barrier for an orifice
in a panel member which includes a plastic carrier having a
peripheral edge. The present invention further includes a patch
adapted to adhere to the plastic carrier and the panel member. The
patch is attached to a portion of the plastic carrier and
encapsulates the peripheral edge of the plastic carrier.
[0009] Additionally, the present invention includes a method of
sealing an orifice in a panel member. The method includes the step
of joining a patch made of a heat-activated material to a portion
of a plastic carrier such that the patch encapsulates a peripheral
edge of the plastic carrier. Next, the plastic carrier is attached
to the panel member. Finally, the plastic carrier is adhered to the
panel member with a portion of the patch disposed between the
plastic carrier and the panel member.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] In the drawings:
[0011] FIG. 1A shows an expanded view of a physical barrier
according to the present invention.
[0012] FIG. 1B shows a perspective view of a physical barrier
according to the present invention.
[0013] FIG. 2 shows an exploded view of a physical barrier
according to the present invention.
[0014] FIG. 3A shows a perspective view of a carrier according to
the present invention.
[0015] FIG. 3B shows a perspective view of a physical barrier
according to the present invention.
[0016] FIG. 4A shows a perspective view of a carrier according to
the present invention.
[0017] FIG. 4B shows a perspective view of a physical barrier
according to the present invention.
[0018] FIG. 5A shows an expanded view of a physical barrier
according to the present invention.
[0019] FIG. 5B shows a perspective view of a physical barrier
according to the present invention.
[0020] FIG. 6 shows a cross-sectional view of the physical barrier
of FIG. 1B according to another embodiment of the present
invention.
[0021] FIG. 7 shows a cross-sectional view of the physical barrier
of FIG. 3B according to another embodiment of the present
invention.
[0022] FIG. 8 shows a cross-sectional view of the physical barrier
of FIG. 5B according to another embodiment of the present
invention.
DETAILED DESCRIPTION OF THE INVENTION
[0023] The physical barrier 10 of the present invention consists of
a plastic carrier 12 and a sealer patch 14 as shown in FIG. 1.
Carrier 12 includes a deck 16 and at least one snap-fit fastener
18. Together, carrier 12 and patch 14 form physical barrier 10 for
an orifice in a panel member, where deck 16 supports the center of
patch 14, such that patch 14 does not collapse into the orifice.
Carrier 12 and patch 14 may be shaped and sized to accommodate any
orifice in the panel member.
[0024] The at least one snap-fit fastener 18 in FIG. 1 is a
plurality of protrusions 20 which are generally perpendicular to
the plane of deck 16. These protrusions encompass a majority of the
perimeter defined by the protrusions. Protrusions 20 include an
edge 22 and a holding surface 23.
[0025] The at least one snap-fit fastener 18 in FIGS. 2, 3 and 4 is
a plurality of S-shaped clips 24. The long axis of S-shaped clips
24 lies in the place of the carrier deck 16. S-shaped clips 24
include a holding surface 25 and may include a tail 26.
[0026] The at least one snap-fit fastener 18 in FIG. 5 is a
circumferential trough 28 with a lip 30 included on a continuous
circumferential outer wall 32 of trough 28. Outer wall 32 also
includes a holding surface 33.
[0027] Snap-fit fasteners 18 may be any fastener which causes
carrier 12 to snap into position, i.e., into the orifice to be
sealed. The snap-fit fasteners illustrated in FIGS. 1-5 are not
meant to be limiting, but rather only demonstrative.
[0028] As shown in FIGS. 1, 4 and 5, deck 16 may include a
circumferential ridge 34 which defines a recess into which a
protrusion (not shown) on patch 14 may be placed. This helps ensure
that the patch 14 is properly place on the carrier. The
ridge-protrusion combination also helps to the patch remain in
place during insertion of the physical barrier into the
orifice.
[0029] As shown in FIGS. 3 and 4, carrier 12 may also include
multiple legs 36, which are positioned between snap-fit clips 24
and are oriented away from patch 14.
[0030] Now referring to FIGS. 6-8, another embodiment of the
physical barriers 10 of FIGS. 1-5 is disclosed. Specifically, the
plastic carrier 12 includes a peripheral edge 40. In FIGS. 1-5, the
edge 22 of FIG. 1, the tail 26 of FIGS. 2-4, and the lip 30 of FIG.
5 each define the peripheral edge 40 of the plastic carrier 12. To
generate a more effective seal when received in the orifice of the
panel member, patch 14 is attached to at least a portion of plastic
carrier 12 and encapsulates the peripheral edge 40 of the plastic
carrier 12.
[0031] As shown, the patch 14 is attached to the plastic carrier 12
and supported by the deck 16. To encapsulate the peripheral edge
40, a portion of the patch 14 is wrapped around and under the edge
22, tail 26 or lip 30 and attached to a bottom surface 42.
Preferably, the patch 14 is bonded to the bottom surface 42 by a
technique such as vacuum-forming (described below). However, any
technique that secures the patch 14 around the edge 22, tail 26, or
lip 30 of the plastic carrier 12 to encapsulate the peripheral edge
40 is contemplated by the present invention. Accordingly, when the
physical barrier 10 is received in the orifice, a portion of the
patch 14 is disposed between the plastic carrier 12 and the panel
member. Specifically, a portion of the patch 14 is disposed between
the bottom surface 42 of the edge 22, tail 26, or lip 30 and the
panel member.
[0032] Patch 14 is made of a thermoplastic material that flows when
activated with heat and adheres to both plastic and metal. Any
thermoplastic which adheres to both metal and plastic is suitable
for use in the present invention. Adherence to both metal and
plastic is an attribute that has not been previously produced in
thermoplastic materials.
[0033] In one useful embodiment, patch 14 contains an
ethylene-vinyl acetate (EVA) copolymer combined with a styrene
butadiene rubber (SBR). One useful EVA is the EL-VAX.RTM. 400
series from Dupont. A suitable SBR is the 1006 material from
Ameripol Synpol Corp of Akron, OH.
[0034] Patch 14 may also include suitable fillers such talc, mica,
tall oil rosin and/or other conventional fillers for
thermo-plastics. Talc selected for inclusion in patch 14 may be of
highly pure platy talc such as one or more chosen from the 9900
series from Polar Minerals of Wellsville, OH, while utilized mica
may be a phlogopite mica such as one or more chosen from the 5000
series, also from Polar Minerals. A suitable tall oil rosin may be
selected from the SYLVAROS series from Arizona Chemical Co. of
Jacksonville, FL.
[0035] In one embodiment, EVA is present in amounts of 10-40 wt %,
while SBR is present in amounts of 5-35 wt %. The balance includes
5-22 wt % talc, 10-45 wt % mica and 10-30 wt % tall oil rosin. A
particularly useful material for patch 14 is a composition of 29 wt
% EVA, 16 wt % SBR, 12 wt % talc, 26 wt % mica and 17 wt % tall oil
rosin.
[0036] Carrier 12 may be made of conventional plastic materials,
with the only consideration being the activation temperature for
patch 14. Thus, carrier 12 must be able to maintain its physical
rigidity at the activation temperature; i.e., carrier 12 should not
melt at temperatures used in the chosen heat source. When used in
vehicles, the carrier should withstand temperatures normally
utilized in the paint and coating drying ovens. While metals may be
used, plastics are preferred because of the reduced amount of force
needed to install a plastic carrier as compared to a metal carrier.
One useful plastic material is nylon.
[0037] Physical barrier 10 may be made by conventional
methodologies. Carrier 12, separate from patch 14, can be formed,
interalia, by vacuum forming, injection molding or extrusion. Patch
14 may be formed by similar techniques. Once individually formed,
carrier 12 and patch 14 may be attached to each other prior to
installation into a cavity. An appropriate adhesive may be used,
but heat staking is preferred. Heat staking is a process by which
two plastic parts are effectively spot welded together.
[0038] Methodologies of making carrier 12 and patch 14 parts into
one integral piece may also be utilized. Insert molding, which uses
two molds, and two shot molding, which uses one mold, are suitable
methods of making barrier 10 where carrier 12 and patch 14 are
integral.
[0039] As introduced above, and specifically with the embodiments
of FIGS. 6-8, patch 14 and plastic carrier 12 may be joined by
traditional vacuum-forming techniques generally known to one
skilled in the art. The thermoplastic material of patch 14 is
extruded into a sheet and secured in a vacuum-forming apparatus
(not shown). Similarly, the plastic carrier 12 is also loaded into
the vacuum-forming apparatus. Optionally, the plastic carrier 12
may receive an adhesive prior to being loaded into the
vacuum-forming apparatus. The typically heat-activated or
pressure-activated adhesive facilitates the effective attachment of
the patch 14 to the plastic carrier 12. Next, heat is applied and
the sheet of material of patch 14 is molded over a portion of the
plastic carrier 12 and around the peripheral edge 40 by vacuum or
suction. Pressure is often applied and the joined plastic carrier
12 and patch 14 are cooled. The joined plastic carrier 12 and patch
14 are then cut from the sheet of material of patch 14. In
vacuum-forming the patch 14 to the plastic carrier 12, the amount
of heat applied is limited such that the patch 14 remains generally
solid and the plastic carrier 12 maintains its physical
rigidity.
[0040] The installation of barrier 10 is now described. Barrier 10
is inserted into the orifice to be sealed. The snap-fit fasteners
flex as carrier 12 is seated in the panel member. Edges 22, tails
26 or lip 30 (peripheral edge 40) ensure that carrier 12 is not
over inserted into the orifice. Protrusions 20, legs 36 or outer
wall 32 ensures that carrier 12 is centered and not twisted in the
orifice to be sealed. Holding surfaces 23, 25, 33 are the locations
on the respective snap-fit fasteners which abut the panel member
after carrier 12 has been installed.
[0041] By centering carrier 12, the maximum amount of strain all
snap-fit fasteners 18 have to endure is significantly reduced. This
reduces the strength of snap-fit fasteners that are needed to
properly install barrier 10, which in turn reduces the amount of
force needed to install barrier 10. Thus, force-multiplying tools
or machines are not needed to install the barriers of the present
invention.
[0042] After installation, patch 14 is activated to produce a
contaminant-tight seal. Patch 14 is activated by heating the patch
sufficiently to cause it to flow. Upon cooling, patch 14 will
adhere to carrier 12 and the panel member surrounding the orifice.
Any source of heat may be used to activate patch 14. One
particularly useful heat source is an oven associated with drying
coatings and paints on vehicles. These ovens operate at multiple
temperatures depending on the coating or paint being dried, and
typically operate between about 175.degree. F. and about
400.degree. F.
[0043] Patch 14 adheres the plastic carrier 12 to the panel member
by producing a seal at the interface therebetween. When the patch
14 encapsulates the peripheral edge 40 of plastic carrier 12 (FIGS.
6-8), a portion of the patch 14 is disposed between the plastic
carrier 12 and the panel member. Specifically, a portion of the
patch 14 is disposed between the bottom surface 42 of the edge 22,
tail 26 or lip 30 and the panel member. Often when the plastic
carrier 12 of the physical barrier 10 is received in the orifice of
the panel member, variations in material thickness produce a gap
between the plastic carrier 12 and the panel member. The portion of
patch 14 disposed between the plastic carrier 12 and the panel
member fills the gap therebetween. Hence, a very robust, effective
and complete seal is formed about the orifice of the panel
member.
[0044] Plastic carriers with snap-fit fasteners are highly
advantageous over known metal carriers because no separate tools or
machines are necessary to insert the carrier into a cavity. Metal
carriers often require a tool to bend retention tabs at the time of
installation. Furthermore, the amount of force required to properly
seat the carrier in the orifice is significantly less with a
plastic carrier compared to a metal carrier. Plastic carriers may
be installed by hand. The reduced amount of required installation
force means less problematic installations. The use of plastic
carriers is permitted through the use of a patch which will adhere
to disparate materials, i.e., plastic and metal. Such a patch has
not previously been available.
[0045] While the invention has been specifically described in
connection with certain specific embodiments thereof, it is to be
understood that this is by way of illustration and not of
limitation, and the scope of the appended claims should be
construed as broadly as the prior art will permit.
* * * * *