U.S. patent application number 15/160088 was filed with the patent office on 2016-09-15 for load bearing panel assembly.
This patent application is currently assigned to Century Plastics, Inc.. The applicant listed for this patent is Century Plastics, Inc.. Invention is credited to Joseph W. Marchesano, Calvin A. Saur.
Application Number | 20160264067 15/160088 |
Document ID | / |
Family ID | 49233911 |
Filed Date | 2016-09-15 |
United States Patent
Application |
20160264067 |
Kind Code |
A1 |
Marchesano; Joseph W. ; et
al. |
September 15, 2016 |
LOAD BEARING PANEL ASSEMBLY
Abstract
A panel assembly includes at least one reinforcing assembly made
of a high strength material having a low yield to tensile strength
ratio for energy absorption and reduced weight and profile. The
panel assembly may be light-weight with a low profile to minimize
protrusion into an opening or compartment enclosed by the panel.
The panel assembly may be a floor panel assembly for a vehicle
floor. The reinforcing assembly may traverse the panel such that
the reinforcing assembly extends laterally, e.g., cross-vehicle,
relative to the longitudinal axis of the vehicle body. A method of
making the panel assembly may include forming the reinforcing
assembly by joining a plurality of metal channel members in a
nested arrangement with a plurality of welds to provide a
structural assembly with good bending resistance loads imposed on
the panel assembly including knee loads. The channel members can be
made of dual phase steel.
Inventors: |
Marchesano; Joseph W.;
(Macomb, MI) ; Saur; Calvin A.; (West Bloomfield,
MI) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Century Plastics, Inc. |
Shelby Township |
MI |
US |
|
|
Assignee: |
Century Plastics, Inc.
Shelby Township
MI
|
Family ID: |
49233911 |
Appl. No.: |
15/160088 |
Filed: |
May 20, 2016 |
Related U.S. Patent Documents
|
|
|
|
|
|
Application
Number |
Filing Date |
Patent Number |
|
|
14837427 |
Aug 27, 2015 |
9358725 |
|
|
15160088 |
|
|
|
|
14075367 |
Nov 8, 2013 |
9150255 |
|
|
14837427 |
|
|
|
|
13755558 |
Jan 31, 2013 |
8690228 |
|
|
14075367 |
|
|
|
|
61619592 |
Apr 3, 2012 |
|
|
|
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F16B 2/22 20130101; B29C
43/18 20130101; E04C 2/38 20130101; B29K 2023/06 20130101; B29L
2031/30 20130101; B60R 13/01 20130101; B29C 65/70 20130101; B60R
13/011 20130101; B62D 25/02 20130101; E04C 2/44 20130101; B62D
25/00 20130101; B29C 51/08 20130101; B29L 2031/3005 20130101; B29K
2995/0077 20130101; B29K 2023/12 20130101; B62D 65/02 20130101;
Y10T 156/1002 20150115; F16B 5/06 20130101 |
International
Class: |
B60R 13/01 20060101
B60R013/01; B29C 65/70 20060101 B29C065/70; B29C 43/18 20060101
B29C043/18 |
Claims
1. A bracket comprising: opposing first and second flanges; and a
strap disposed between and connecting the first and second flanges;
wherein the strap defines an opening to receive a component such
that the strap surrounds the component; a first tang portion
defined by one of the first and second flanges; wherein the first
tang portion extends into the opening such that the component is
retained in the opening by the tang portion.
2. The bracket of claim 1, further comprising a second tang portion
defined by the other of the first and second flanges; wherein the
second tang portion extends into the opening and cooperates with
the first tang portion to retain the component in the opening.
3. The bracket of claim 2, wherein the bracket is made of a
bendable material such that the bracket is bendable to: receive a
component between the first and second tang portions and into the
opening; and to exert a compressive force on the component received
in the opening.
4. The bracket of claim 3, wherein the bracket is made of a
polymer-based material.
5. The bracket of claim 1, wherein the first tang portion is
tapered.
6. The bracket of claim 1, wherein the strap includes a bridge
portion; wherein the bridge portion is separated from each of the
first and second flanges by the opening.
7. The bracket of claim 6, wherein the first tang portion is
parallel to the bridge portion.
8. A molded assembly including a molded component, the molded
assembly comprising: a bracket including: opposing first and second
flanges; and a strap disposed between and connecting the first and
second flanges; wherein the strap includes a bridge portion
defining an opening between the bridge and each of the first and
second flanges; wherein at least one of the first flange, the
second flange, and the bridge portion defines at least one
aperture; a molded component including at least one projection;
wherein the at least one projection projects into the at least one
aperture to attach the bracket to the molded component.
9. The molded assembly of claim 8, wherein the projection is formed
by material flowing from the molded component into the aperture
during the molding operation such that the projection has a shape
defined by the aperture.
10. The molded assembly of claim 9, wherein the bracket is made of
a polymer-based material; and wherein the molded assembly further
includes a polymeric bond formed between the bracket and the molded
component.
11. A method of forming a molded assembly, the method comprising:
inserting a first non-metallic sheet in a mold; wherein the mold
defines a first component and a second component; inserting a
bracket into the mold; inserting a second non-metallic sheet into
the mold such that the bracket is interposed between the first and
second sheets; and molding the molded assembly such that the molded
assembly comprises: the first component formed from the first
sheet; a second component formed from the second sheet; wherein:
the first and second components are operatively attached to each
other; the bracket is contained between the first and second
components; and at least one of the first and second components
projects into the bracket to operatively attach the bracket and
said at least one of the first and second components.
12. The method of claim 11, wherein the bracket defines an
aperture; and molding the molded assembly further comprises: said
at least one of the first and second components projecting into the
aperture to operatively attached the bracket and said at least one
of the first and second components.
13. The method of claim 11, wherein the bracket is made of a
polymer-based material; and molding the molded assembly further
comprises: forming a polymeric bond between the bracket and at
least one of the first and second components.
14. The method of claim 11, wherein the bracket defines an opening
to receive a third component; and molding the molded assembly
further comprises: inserting the third component into the opening
prior to inserting the second non-metallic sheet into the mold,
such that the third component is retained in the bracket and
interposed between the first and second sheets.
15. The method of claim 14, wherein the third component is retained
in the bracket such that the third component is slidably attached
to the bracket.
16. The method of claim 14, wherein the bracket further comprises:
opposing first and second flanges; and a strap disposed between and
connecting the first and second flanges; wherein the strap defines
the opening.
17. The method of claim 16, wherein the bracket further comprises:
a tang portion defined by at least one of the first and second
flanges; wherein the tang portion extends into the opening and is
in contact with the third component to retain the component in the
opening.
18. The method of claim 16, wherein the strap is configured to
exert a compressive force on the third component such that the
third component is retained in the bracket by the compressive
force.
19. The method of claim 11, further comprising: forming a rib in
one of the first and second components such that the bracket is at
least partially disposed in the rib.
Description
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims the benefit of U.S. Non-Provisional
patent application Ser. No. 14/837,427 filed Aug. 27, 2015, which
is a continuation application of U.S. Pat. No. 9,150,255 issued
Oct. 6, 2015, which is a divisional application of U.S. Pat. No.
8,690,228 issued Apr. 8, 2014, which claims priority to U.S.
Provisional Application 61/619,592 filed Apr. 3, 2012, which are
hereby incorporated by reference in their entirety.
TECHNICAL FIELD
[0002] The present invention relates generally to a load bearing
panel assembly.
BACKGROUND
[0003] A panel assembly may be used to enclose a structure which
may define an opening or compartment which is to be covered by the
panel. The panel may be configured to withstand a force or load
imposed on the panel without failing and/or exceeding a maximum
deflection. Panel assemblies are used in vehicles to enclose
various structures. For example, door panels configured to
withstand bending and deflection forces are used to enclose door
structures. In another example, a floor panel may be positioned in
a floor, trunk, storage, or cargo space of a vehicle to enclose a
compartment used to enclose or store one or more vehicle
components, such as a spare tire or vehicle jack, or other vehicle
user items, such as luggage, tools, etc. The floor panel should be
configured to withstand bending and deflection forces and loads
imposed by items which may be placed on the floor panel, which may
include vehicle users standing, sitting or kneeling on the floor
panel. A floor panel may be used in a vehicle including one or more
retractable seats, where the floor panel is configured to cover the
seat(s) when the seat(s) are fully retracted into a compartment
defined by the floor structure of the vehicle. In this
configuration, the panel should be configured to withstand loading
and deflection forces imposed on the panel when the seats are in
the retracted position, which may include withstanding a minimum
knee loading requirement. Panels of non-reinforced twin sheet
construction may not resist loading forces or may warp or distort
in high temperature operating environments. Floor panels
strengthened by adding a matrix or grid of reinforcing materials,
and/or by increasing the depth of the panel profile or the
thickness of the panel are disadvantaged by volume and weight added
to the floor panel, such that the panel assembly presents a weight
penalty to the vehicle and/or may be difficult to manipulate by a
user, and/or the thick panel structure extends substantially into
the vehicle compartment being enclosed to consume a portion of the
compartment space, thus limiting the open compartment space
available for storage, for example, of the retracted seat(s).
SUMMARY
[0004] A molded assembly and method for making the molded assembly
is provided herein. The molded assembly described herein includes a
bracket attached to a molded component during the molding process
by at least one of a projection formed in an aperture of the
bracket during the molding process and a polymeric bond formed
between the bracket and the molded component during the molding
process. In one example, the bracket includes opposing first and
second flanges and a strap disposed between and connecting the
first and second flanges. The strap defines an opening to receive a
component such that the strap surrounds the component. The strap
includes a bridge portion which is separated from each of the first
and second flanges by the opening. In one example, the component
received into the bracket is a reinforcing component for
reinforcing the molded assembly. In one example, the bracket
includes a first tang portion defined by one of the first and
second flanges, where the first tang portion extends into the
opening such that the component is retained in the opening by the
tang portion. The bracket can include a second tang portion defined
by the other of the first and second flanges, where the second tang
portion extends into the opening and cooperates with the first tang
portion to retain the component in the opening. The bracket can be
made of a bendable material, which can be a polymer based material,
such that the bracket is bendable to receive a component between
the first and second tang portions and into the opening and to
exert a compressive force on the component after the component is
received in the opening.
[0005] In one example, at least one of the first flange, the second
flange, and the bridge portion defines at least one aperture, such
that during the molding process, material flows from the molded
component into the aperture to form a projection, where the
projection has a shape defined by the aperture. In an illustrative
example, the aperture is defined by a conical and/or tapered
surface.
[0006] A method of forming a molded assembly is provided, and
includes inserting a first non-metallic sheet in a mold, where the
mold defines a first component and a second component; inserting a
bracket into the mold; and inserting a second non-metallic sheet
into the mold such that the bracket is interposed between the first
and second sheets. The method further includes molding the molded
assembly such that the molded assembly includes the first component
formed from the first sheet and a second component formed from the
second sheet, where the first and second components are operatively
attached to each other, the bracket is contained between the first
and second components, and at least one of the first and second
components projects into the bracket to operatively attach the
bracket to at least one of the first and second components. The
bracket can include an aperture defined, for example, by a flange
or bridge portion of the bracket, such that during the molding
process, material flows from the molded component into the aperture
to form a projection, where the projection attaches the bracket to
the molded component. The projection can be molded such that the
projection has a shape defined by the aperture.
[0007] The above features and other features and advantages of the
present teachings are readily apparent from the following detailed
description of the best modes for carrying out the present
teachings when taken in connection with the accompanying
drawings.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] FIG. 1 is a schematic perspective view of an inner side of a
panel assembly;
[0009] FIG. 2 is a schematic perspective view of an outer side of
the panel assembly of FIG. 1;
[0010] FIG. 3 is a fragmentary cross-sectional view of section 3-3
of the panel assembly of FIGS. 1 and 2;
[0011] FIG. 4 is a schematic perspective view of a reinforcing
assembly and brackets of the panel assembly of FIGS. 1 and 2;
[0012] FIG. 5 is a top view of the reinforcing assembly of FIG.
4;
[0013] FIG. 6 is a cross-sectional view of section 6-6 of the
reinforcing assembly of FIG. 5;
[0014] FIG. 7A is a schematic perspective view of the bracket of
FIG. 4;
[0015] FIG. 7B is a cross-sectional view of section 7B-7B of the
bracket of FIG. 7A;
[0016] FIG. 8 is a fragmentary cross-sectional view of section 8-8
of a portion of the panel assembly of FIGS. 1 and 2; and
[0017] FIG. 9 is a fragmentary cross-sectional view of section 9-9
of a portion of the panel assembly of FIGS. 1 and 2.
DETAILED DESCRIPTION
[0018] Referring to the drawings wherein like reference numbers
represent like components throughout the several figures, the
elements shown in FIGS. 1-9 are not necessarily to scale or
proportion. Accordingly, the particular dimensions and applications
provided in the drawings presented herein are not to be considered
limiting. Referring to FIGS. 1 and 2, generally indicated at 10 is
a load bearing panel assembly including a first panel generally
indicated at 20 and a second panel generally indicated at 30. The
first panel 20 may be configured as an outer panel or appearance
panel, such that when the panel assembly 10 is in an installed
position, the first panel 20 is outwardly facing relative to an
opening or compartment enclosed by the panel assembly 10. The
second panel 30 may be configured as an inner panel or support
panel, such that when the panel assembly 10 is in an installed
position, the second panel 30 is inwardly facing relative to an
opening or compartment enclosed by the panel assembly 10. The first
and second panels 20, 30 may be joined to form the panel assembly
10 using a twin sheet compression molding or similar thermoforming
process, which may include vacuum forming and/or blow molding of
the panel assembly 10 and/or the first and second panels 20,
30.
[0019] The panel assembly 10 includes a reinforcing assembly 12
which is interposed between the first and second panels 20, 30, and
retained in position relative to the panel assembly 10 by a
plurality of brackets 40. Referring to FIG. 3, in a non-limiting
example the panel assembly 10 may be configured as a vehicle floor
panel which may be positioned in a floor, trunk, or storage or
cargo space of a vehicle 60 to enclose a compartment 62 defined by
the vehicle 60. The compartment 62 may be configured to house,
enclose, store, or provide access to one or more vehicle
components, such as a spare tire, vehicle jack, battery, electrical
wiring, vehicle frame or structural component, etc., or to enclose
or store other vehicle user items, such as luggage, tools, etc. The
panel assembly 10 may be removable or repositionable to access the
compartment 62. The panel assembly 10 is configured to withstand a
bending and deflection force F (see FIG. 3) which may be imposed by
items which may be placed on the panel assembly 10, which may
include a vehicle user standing, sitting or kneeling on the panel
assembly 10.
[0020] In the illustrative example shown in FIGS. 1-3, the panel
assembly 10 may be used in a vehicle 60 including one or more
retractable seats (not shown), where the panel assembly 10 is
configured to cover the seat(s) when the seat(s) are fully
retracted into the compartment 62 defined by the floor structure of
the vehicle 60. The vehicle 60 may define a panel interface 58,
which in the example shown may be configured as a recessed ledge
around the perimeter of the compartment 62 to receive the panel
assembly 10 to enclose the compartment 62, and may also be referred
to herein as a perimeter ledge. The panel assembly 10 may include a
compartment interface 64, which may be configured as a perimeter
section or lip configured to generally conform to the perimeter
ledge 58. The compartment interface 64 may be configured as a
perimeter lip such that when the panel 10 is in the installed
position in the vehicle 60 as shown in FIG. 3, the outer panel 20
is generally flush with the floor 68 of the vehicle 60 with the
appearance surface 22 of the outer panel 20 facing outward relative
to the compartment 62, and the inner panel 30 extending into the
compartment 62 to a profile depth a, such that the compartment 62
has a usable volume characterized by a compartment depth b. In the
illustrative example, the compartment depth b is sufficient to
allow storage of a retractable seat in a retracted position in the
compartment 62.
[0021] The panel assembly 10 includes a reinforcing assembly 12
interposed between the outer and inner panels 20, 30 such that the
panel assembly 10 including the reinforcing assembly 12 is
configured to withstand loading and deflection or bending forces
generally indicated at F which may be imposed on the panel assembly
10 when the seats are in the retracted position and the panel
assembly 10 is supported by the perimeter ledge 58 such that the
panel assembly 10 encloses the compartment 62. The bending force F
which must be withstood by the panel assembly 10 may be expressed
as a minimum knee loading requirement. In one example, a minimum
knee loading requirement for a vehicle floor panel, such as the
panel assembly 10, may be the ability to withstand a point load F
of 225 pounds such that deflection of the panel assembly 10 in the
direction of the point load does not exceed 15 mm during loading,
and permanent deflection of the panel after loading to 225 pounds
does not exceed 5 mm. As will be described in further detail, the
reinforcing assembly 12 is positioned relative to the panel
assembly 10 using one or more brackets 40, retained between the
panels 20, 30 and enclosed within a reinforced rib 38 defined by
the inner panel 30 during the forming of the panel assembly 10.
[0022] Referring again to FIGS. 1 and 2, the panel assembly 10 may
include one or more extensions 24 which may be configured for one
or more uses. For example, an extension 24 may include a fastener,
such as a hinge, pin or U-bolt, for movably attaching the panel
assembly 10 to the vehicle 60 or floor 68. An extension 24 may be
configured as a handle for lifting or moving the panel assembly 10
to access the compartment 62, for example, during stowage of a
retractable seat (not shown) into the compartment 62, or retrieval
of the stowed seat therefrom. The panel assembly 10 may include one
or more other elements (not shown) which may include, for example,
handles, latches, hold-down straps, d-rings, fasteners and/or trim
components.
[0023] In the installed position in the vehicle, the outer panel 20
is outwardly facing so as to be viewable by a vehicle user. The
outer panel 20 may be made of a polypropylene-based material, a
scrim reinforced polyethylene, or other moldable or compression
formable material. The material comprising the outer panel 20 may
include a reinforcing fiber, which may be scrim, a natural fiber
such as a wood fiber, or other reinforcing element. The outer panel
20 may be characterized by an appearance surface 22, which may be
defined by or attached to the outer panel 20. The appearance
surface 22 may be configured to match or complement other
appearance surfaces of the vehicle 60, including, for example, the
floor 68. The appearance surface 22 may include, for example, a
carpet or other textile material, which may be tufted or woven, a
vinyl, thermoplastic olefin, or other polymeric material, which may
be textured, coated or otherwise treated or processed to provide
the appearance surface 22. The appearance surface 22 may be
configured to meet the requirements of a class "A" surface, e.g.,
an appearance surface which is viewable by the vehicle user during
ordinary vehicle use.
[0024] The inner panel 30 may be made of a polypropylene-based
material, a scrim reinforced polyethylene, or other moldable or
compression formable material. The material comprising the inner
panel 30 may include a reinforcing fiber, which may be scrim, a
natural fiber such as a wood fiber, or other reinforcing element.
The inner panel 30 may include a plurality of protrusions 34 and a
plurality of recesses 32 which may be arranged to support,
strengthen and/or stiffen the panel assembly 10, and/or define the
profile of the inner panel 30. The plurality of recesses 32 may be
configured to define a plurality of bonded interfaces 70. The
configuration of the protrusions 34 may vary, and may include one
or more elongated ribs oriented generally parallel to one or more
of the x- and y-directions (see FIG. 2), or skewed (not shown) to
one or more of the x- and y-directions. Two or more of the
protrusions 34 may bisect each other in an orthogonal and/or
non-orthogonal arrangement. The plurality of protrusions 34 may be
arranged to provide one or more recesses 32. A recess 32 may be
configured to generally conform to or receive an item stored in the
compartment 62. For example, the plurality of protrusions 34 may
provide a recess 32 configured to conform to a retracted seat
stowed in the compartment 62 (not shown), to optimize the storage
capacity of the compartment 62 in combination with the panel
assembly 10. The protrusions 34 may be solid or partially filled
(not shown), or, as shown in the illustrative example of FIG. 3,
may be configured as hollow ribs or protrusions to reduce the
weight of the panel assembly 10 in comparison with a similar
structure formed with solid or partially filled ribs.
[0025] The protrusions 34 may be configured to define a "low
profile panel assembly" 10, wherein a "low profile panel assembly"
is a panel assembly 10 configured to minimize the profile depth a
(see FIG. 3) to which the panel assembly extends into the
compartment 62 being enclosed by the panel assembly 10, while
meeting the functional requirements, including the bending load and
deflection resistance, to which the panel assembly 10 is subject.
In one example, the protrusions 34 and the reinforced rib 38
including the reinforcing assembly 12 are configured such that the
profile depth a of the low profile panel assembly 10 has a maximum
profile depth a of 25 mm. In another example, the panel assembly 10
is configured such that the profile depth a of the "low profile
panel assembly" 10 is between 16 mm and 25 mm. In another example,
the panel assembly 10 is configured such that the profile depth a
of the low profile panel assembly 10 does not exceed 16 mm.
Limiting the profile depth a as described herein optimizes the
storage volume of the compartment 62, which may be defined by the
compartment depth b.
[0026] FIGS. 1 and 2 show the panel assembly 10 configured as a
load bearing floor panel including a reinforcing assembly 12
positioned in the panel assembly 10 such that in an installed
position in the vehicle 60, the reinforcing assembly 12 is
laterally oriented cross-vehicle, e.g., is perpendicular to the
longitudinal fore-to-aft or x-axis of the vehicle, where the
longitudinal or x-axis is understood to be the axis of the vehicle
extending from the front of the vehicle to the rear of the vehicle,
and the lateral or y-axis of the vehicle extends from one side of
the vehicle such as the driver side to the opposing side (the
passenger side) of the vehicle. The reinforcing assembly 12 and
reinforcing rib 38 may be configured to substantially traverse the
panel assembly 10, e.g., to extend from one edge to an opposing
edge of the panel assembly 10, and may be centrally located within
the panel assembly 10, e.g., substantially parallel and proximate
to the lateral axis of the panel assembly 10, as shown in the
illustrative example of FIGS. 1-2. The reinforcing rib 38 may be
configured to enclose the reinforcing assembly 12 within the panel
assembly 10, such that the reinforcing assembly 12 is protected
from exposure to the environment, which may include protecting the
reinforcing assembly 12 from potentially corrosive contaminants,
thereby minimizing or eliminating the need for application of any
protective coating to or anti-corrosive treatment of the
reinforcing assembly 12 prior to assembly in the panel assembly
10.
[0027] The example shown in FIGS. 1-2 is not intended to be
limiting, and it would be understood that other configurations of
the panel assembly 10 and the reinforcing assembly 12 are possible.
For example, the reinforcing assembly 12 may be positioned
substantially parallel to the longitudinal axis of the panel
assembly 10, may be centrally located or proximate a portion of the
perimeter of the panel assembly 10. The reinforcing assembly 12 may
be configured to traverse a portion of the panel assembly 10, e.g.,
the reinforcing assembly 12 may not extend fully from one perimeter
edge to another perimeter edge of the panel assembly 10. The panel
assembly 10 may include a plurality of reinforcing assemblies 12,
which may be of any arrangement to provide the bending resistance
and load strength required of the panel assembly 10 in use. For
example, the panel assembly 10 may include a plurality of
reinforcing assemblies 12 (not shown) arranged peripherally
relative to and/or adjacent to the compartment interface 64 of the
panel assembly 10. The plurality of reinforcing assemblies 12 (not
shown) may be arranged parallel or skewed relative to each other to
be non-bisecting. The panel assembly 10 may include a plurality of
reinforcing assemblies 12 in an intersecting or bisecting
arrangement (not shown), which may be one of a grid-pattern, an
X-formation, a parallelogram, a triangle, or other polygon, by way
of non-limiting example, and may bisect each other in an orthogonal
or non-orthogonal arrangement or combination of these.
[0028] FIGS. 4-6 show the reinforcing assembly 12. Referring to
FIG. 4, one or more brackets 40 may be operatively attached to the
reinforcing assembly 12 and arranged to position the reinforcing
assembly 12 relative to the panel assembly 10. The brackets 40, as
will be described in further detail, are configured to be slidably
attached to the reinforcing assembly 12 for ease of positioning
during forming of the panel assembly 10. It would be understood
that the number and placement of brackets 40 may vary depending on
the length of the reinforcing assembly 12, the positioning of the
reinforcing assembly 12 in the panel assembly 10, and the
configuration of the panel assembly 10. One or more compressible
elements 16 may be operatively attached to the reinforcing assembly
12. As shown in FIGS. 1-4, a compressible element 16 may be applied
between each adjacent pair of brackets 40 on the sides of the
reinforcing assembly 12 which interface with the outer and inner
panels 20, 30. In one example, the compressible element 16 may be
configured as an adhesive foam tape which may be adhesively
fastened to the reinforcing assembly 12, to facilitate bonding of
the outer and inner panels 20, 30 to the reinforcing assembly 12 at
bonding interfaces 36 (see FIG. 9), to provide a cushion and/or
transitioning material between the outer or inner panels 20, 30 and
the reinforcing assembly 12 (see FIG. 9), to stabilize the position
of the reinforcing assembly 12 relative to the panel assembly 10,
and to substantially prevent any "buzz, squeak, rattle" from
originating from the interface of the reinforcing assembly 12 with
any of the brackets 40 and outer and inner panels 20, 30 or
movement of the reinforcing assembly 12 in use.
[0029] The compressible element 16 may be configured as a pressure
sensitive adhesive (PSA) tape, which may have a pressure sensitive
adhesive, such as an acrylic-based adhesive, applied to opposing
sides of the tape such that compressible elements 16 may be placed
in adhesive contact and adhered to the reinforcing assembly 12 and
to the outer and inner panels 20, 30 at bonding interfaces 36 as
shown in FIG. 9. The tape may be formed of polymeric foam, which
may be a polyolefin, polyethylene (PE) or ethylene vinyl acetate
(EVA) foam, for example. The PSA tape may have a removable release
liner to protect the adhesive until the liner is removed. For
example, a first side of the compressible element 16 may be adhered
to the reinforcing assembly 12 with a release liner covering the
non-adhered opposing side. The release liner may remain intact to
protect the adhesive until the reinforcing assembly 12 is inserted
in the mold forming the panel assembly 10, and the release liner
removed prior to positioning the reinforcing assembly 10 in the
mold. The compressible element 16 may be configured as a foam
insert or strip, which may be, for example, made of open cell foam.
An adhesive (not shown) may be applied to the compressible element
16 to bond the compressible element to the reinforcing assembly 12
and/or to the inner and outer panels 20, 30. The compressible
element 16 may have adhesive applied to one surface only, such that
the compressible element 16 is adhered to the reinforcing assembly
12 and in contact with one or the other of the outer and inner
panels 20, 30 as a result of the forming process of the panel
assembly 10. The compressible element 16 may be compressed during
forming of the panel assembly 10 such that the compressible element
16 in a compressed state exerts a force against the reinforcing
assembly 12 and the adjacent panel 20, 30 which inhibits movement
of the reinforcing assembly 12 relative to the panels 20, 30, such
that the compressible element 16 acts as an anti-rattle component
to prevent or substantially minimize any NVH conditions originating
from the panel assembly 10.
[0030] As shown in FIG. 6, the reinforcing assembly 12 is comprised
of a plurality of channel members which are fixedly connected to
form the assembly 12. In the example shown, a first channel member
14A and a second channel member 14B are arranged in a nested
configuration such that first legs 26A, 26B of the respective
channel members 14A, 14B are adjacent to each other, and second
legs 28A, 28B of the respective channel members 14A, 14B are
adjacent to each other, to form opposing double wall vertical (as
shown in FIG. 6) sides of the reinforcing assembly 12, and to form
opposing single wall horizontal (as shown in FIG. 6) sides of the
reinforcing assembly 12. As shown in FIGS. 5 and 6, the nested
channel members are fixedly connected to each other by forming a
plurality of welds 18 between the respective end of the outermost
leg 26B, 28A of one channel member and the adjacent portion of the
respective other channel member 14A, 14B. The adjacent portion of
the respective other channel member 14A, 14B generally coincides
with the transition or bend 66 between the web 56 and leg portion
of the channel member 14A, 14B. The plurality of welds 18 may be
formed at intermittently spaced positions along the length of each
of the two seam lines formed on opposing corners of the nested
channel members 14A, 14B to form the reinforcing assembly 10 having
horizontal sides (as oriented in an installed position in the
vehicle) of single wall construction, and vertical sides of double
wall construction. The welds 18 may be spaced, for example,
approximately 7-10 inches from each other along each seam line. In
one example, the reinforcing assembly 12 is approximately 38 inches
in length and includes welds at each end and spaced at intervals of
approximately 9-9.5 inches (weld center to weld center)
therebetween over the length of each of the opposing seams.
[0031] As shown in FIG. 6, each of the horizontal single wall sides
includes a web portion 56 of one of the channel members 14A, 14B,
and each of the vertical double wall sides includes a pair of
adjacent legs 26A, 26B or 28A, 28B joined by welding. The resulting
structure of the reinforcing assembly 12 is resistant to buckling
and provides sufficient bending resistance to meet the bending load
requirements of the panel assembly 10. The nested construction of
the reinforcing assembly 12 provides a assembly 12 having an
overall width W which is greater than the height H, such that the
reinforcing assembly 12 can be formed with a low profile (H<W)
with buckling strength substantially provided by the welded double
wall construction. In one example, a "low profile reinforcing
assembly" 12 has an overall height to width ratio of less than 0.75
(H.ltoreq.0.75 W), where the height in less than 25 mm in one
example, between 16 mm and 25 mm in a second example, and less than
16 mm in a third example. In another example, the overall height to
width ratio is less than 0.7 (H.ltoreq.0.75 W), where the channel
members 14A, 14B are U-channel members having a gage thickness of
0.047 inches, a leg length (height) of 0.625 inches and a web width
of 0.960 inches.
[0032] The channel members 14A, 14B may be made of a metallic
material. In the example shown, the channel members 14A, 14B are
made of a dual phase steel to provide a high strength structure
with good bending resistance and high springback, to meet knee
loading requirements including maximum loaded and permanent
deflection limits. By using dual phase steel, channel members 14A,
14B may be made from lower gage (thinner) material relative to
channel members made from other non-dual phase steel materials. The
use of lower gage e.g., relatively thinner, channel stock in
conjunction with the dual wall construction provides a low-profile
reinforcing assembly which enables formation of the panel assembly
10 as a low-profile panel, e.g., one where the profile depth a (see
FIG. 3) can be minimized for the panel application. In one example,
the channel members 14A, 14B may be made from dual phase 780
(DP780) steel, which may also be designated as DIN EN 10336 or
HCT780X, or similar dual phase steel material. The channel members
14A, 14B may be constructed of 18 gage stock have a leg length of
approximately 0.75 inches and a web width of approximately 1 inch.
In one example, each channel member 14A, 14B is made from DP780
steel having a thickness of 0.047 inches, formed as a U-channel
member having a web width of 0.960 inches, a leg length (height) of
0.625 inches and a transition 66 radius therebetween of
approximately 0.070 inches. By example, the material used to form
channel members 14A, 14B may be characterized by a yield strength
of 450-780 MPa, a tensile strength of 780-900 MPa, and an
elongation of 14% minimum or preferably greater than 17%. The
channel members 14A, 14B may have a protective coating applied, for
example, to improve corrosion protection. Example coatings may
include hot-dip galvanizing and hot-dip galvanneal treating of the
dual phase steel material. Other protective coatings may be used,
including organic coatings. The high strength, thin gage, and
hollow structure of the reinforcing assembly 12, in combination
with the single wall construction of the horizontal sides of the
reinforcing assembly 12 provide a low-profile and lightweight
assembly for reinforcement of the panel 10. The examples provided
here are non-limiting, and other materials may be used to form the
channel members 14A, 14B, including high strength steel, aluminum,
and other metals.
[0033] As shown in FIGS. 1-3, the reinforcing assembly 12 is
positioned in the panel assembly 10 using a plurality of brackets
40. During the process of forming the panel assembly 10, each
bracket 40 is operatively attached to the outer and inner panels
20, 30 to retain the reinforcing assembly 12 relative to the inner
and outer panels 20, 30 in an anti-rattle configuration, thereby
preventing or substantially eliminating BSR or NVH generating
conditions. The number and spacing of the brackets 40 used to
position the reinforcing assembly 12 may vary depending on the
length of the reinforcing assembly 12, the positioning of the
reinforcing assembly 12 in the panel assembly 10, and the
configuration of the panel assembly 10 such that one or more
brackets 40 may be used to position a reinforcing assembly 12. An
example bracket 40 is shown in additional detail in FIGS. 7A and
7B, and in assembled position relative to the panel assembly 10 in
FIGS. 8 and 9. As shown in FIGS. 7A, 7B, the bracket 40 includes a
pair of flanges 42, each flange extending from opposing sides of
strap portions 50. The straps 50 are joined by a bridge portion
(bridge) 46 to form the body of the bracket 40. An opening 48 is
defined by the straps 50, bridge 46 and each flange 42, to provide
a lightweight bracket 40. The bracket 40 is made of a polymer-based
material, such that the bracket 40 may be formed by molding and of
a bendable configuration for ease of assembly onto the reinforcing
assembly 10. The polymer-based material may be characterized by
bonding compatibility with at least one of the outer and inner
panels 20, 30. By way of example, the bracket 40 may be made from a
polypropylene (PP) material, which may include recycled PP.
[0034] Each flange 42 of the bracket 40 defines a tang portion or
tang 54 which extends centrally through the opening 48, as shown in
FIGS. 7A, 7B, and is configured to conform to the reinforcing
assembly 12 to retain the reinforcing assembly 12 in the bracket
40, as shown in FIG. 8. The bracket 40 is configured to be in
slidable contact with the reinforcing assembly 12, e.g., the straps
50, bridge 46 and tangs 54 cooperate to provide a sliding interface
with the reinforcing assembly 12 while retaining the reinforcing
assembly 12 in the bracket 40. The straps 50, bridge 46 and tangs
54 are configured such that the bracket 40 may exert a compressive
force on the reinforcing assembly 12 to retain the reinforcing
assembly 12 in position in a non-rattling configuration, e.g., in
an assembled position in the panel assembly 10, the bracket 40 is
maintained in close contact with the reinforcing assembly 12 such
that the reinforcing assembly 12 is prevented from rattling,
twisting, squeaking, vibrating or otherwise generating a "buzz,
squeak, rattle" (BSR) or "noise, vibration and harshness" (NVH)
condition.
[0035] During forming of the panel assembly 10, the bracket 40 is
sandwiched between the outer and inner panels 20, 30, such that
during molding the bracket 40 becomes bonded to the outer and inner
panels 20, 30. As described previously, the bracket 40 and outer
and inner panels 20, 30 may each include a polypropylene based
material, to provide bonding compatibility between the bracket 40
and panels 20, 30. The bracket 40 may include a plurality of
openings or apertures 44 defined by the flanges 42 and bridge 46.
As shown in FIG. 8, during the process of forming the panel
assembly 10, for example, during compression molding of the panel
assembly 10, material from the outer and inner panels 20, 30 flows
into each of the apertures 44 such that the flowed material forms a
projection 52 in each aperture 44 to connect the bracket 40 with
the respective outer or inner panel 20, 30 from which the material
has flowed. The projection 52 contacts the aperture 44 and extends
or bulges into the aperture 44 to retain the bracket 40 in position
relative to outer and inner panels 20, 30, e.g., relative to the
panel assembly 10, thereby defining an anti-rattling feature by
preventing movement of the bracket 40 and the reinforcing assembly
12 relative to the inner and outer panels 20, 30, and preventing
"buzz, squeak, rattle" (BSR) and "noise, vibration and harshness"
(NVH) conditions from originating in the panel assembly 10, and
increasing the strength of the bond between the bracket 40 and the
outer and inner panels 20, 30.
[0036] The panel assembly 10 may be formed, by way of non-limiting
example, using a thermoforming process which may include vacuum
forming, blow molding and/or compression molding. For example, the
panel assembly 10 may be formed by providing a first preheated
sheet of material, e.g., a raw board, of the type used to form the
inner panel 30, to a mold (not shown) configured to define the
profile of the inner panel 30. The mold may be preheated. The mold
is configured in a press or similar equipment (not shown) such that
a vacuum may be applied to the mold to at least partially form the
profile of the inner panel 30 and at least partially define a
reinforcing rib 38 in the inner panel 30. The reinforcing bar 12
including attached compressible elements 16 and slidably attached
brackets 40 is inserted into the reinforcing rib 38 portion of the
inner panel 30, now formed in the mold. Prior to inserting the
reinforcing bar 12 into the mold, adhesive surfaces of the
compressible elements 16 may be exposed, for example, by removal of
a protective release liner, such that the compressible elements 16
may be adhered to the panels 20, 30 during the molding process. If
required, the position of the brackets 40 may be adjusted to
position the reinforcing assembly 12 and/or brackets 40 relative to
the inner panel 30 and/or the mold.
[0037] A second preheated sheet of material of the type used to
form the outer panel 20 is provided to the mold, and the mold is
activated to blow form the outer panel 20. An appearance layer 22,
which may be a carpet material, textile, or other insert, as
described previous, may be provided to the mold and applied or
placed in contact with the outer panel 20, for bonding to the outer
panel during a compression molding cycle. The mold is closed and a
compression molding cycle is activated. The mold may include a trim
feature such that the first and second sheets are trimmed by
closure of the mold to define the compartment interface 64 of the
panel assembly 10. During the compression molding cycle, which may
include a cure and/or cooling cycle, the brackets 40 are bonded to
the outer and inner panels 20, 30, and material from the outer and
inner panels 20, 30 flows into the apertures 44 to form the
projections 52, to retain the reinforcing assembly 12 in position
relative to the outer and inner panels 20, 30. The outer and inner
panels 20, 30 are bonded to each other during the compression cycle
to form bonded interfaces 70 (see FIGS. 3, 8, 9) to adhere the
outer panel 20 to the inner panel 30, thereby forming the panel
assembly 10. The panel assembly 10 is removed from the mold. The
formed panel assembly 10 may be further processed. For example,
trim components, such as fasteners, latches, straps, clips,
handles, d-rings, etc. may be attached or applied to the panel
assembly 10.
[0038] The examples shown in FIGS. 1-9 are intended to be
non-limiting, and it would be understood that additional
configurations of the load bearing panel 10 described herein are
possible. For example, the panel assembly 10 may be configured for
use other than as a floor assembly and may be configured in other
than a horizontal orientation to enclose an opening or compartment,
which may require a low profile closure as provided by the panel
assembly 10.
[0039] The detailed description and the drawings or figures are
supportive and descriptive of the invention, but the scope of the
invention is defined solely by the claims. While some of the best
modes and other embodiments for carrying out the claimed invention
have been described in detail, various alternative designs and
embodiments exist for practicing the invention defined in the
appended claims.
* * * * *