U.S. patent application number 09/930284 was filed with the patent office on 2002-02-21 for extrusion for boat windshield.
This patent application is currently assigned to Bombardier Motor Corporation of America. Invention is credited to Eck, Richard E., Kalhok, David.
Application Number | 20020020337 09/930284 |
Document ID | / |
Family ID | 26919871 |
Filed Date | 2002-02-21 |
United States Patent
Application |
20020020337 |
Kind Code |
A1 |
Eck, Richard E. ; et
al. |
February 21, 2002 |
Extrusion for boat windshield
Abstract
The present invention provides a header for rigidly engaging an
upper edge of a boat windshield and supporting a boat canopy. The
header comprises an elongated member having a generally uniform
transverse cross-section. The cross-section is defined by an upper
rail having a convexly curved top surface and a bottom defining
first and second respective sides. First and second arms protrude
downwardly from the first and second sides of the upper rail. A
windshield-engaging channel for receiving the boat windshield is
formed between the first and second arms. A first groove is formed
within the upper rail and extends inwardly from the first side of
the upper rail. To reduce wear and tear on a boat canopy attached
to the header, the curvature of the convexly curved top surface
increases from the first side to the second side of the upper rail
to maximize the load-bearing contact area between the canopy and
the header.
Inventors: |
Eck, Richard E.; (Mount
Vernon, IL) ; Kalhok, David; (Marion, IL) |
Correspondence
Address: |
PILLSBURY & WINTHROP LLP
1600 Tysons Boulevard
McLean
VA
22102
US
|
Assignee: |
Bombardier Motor Corporation of
America
6545 U.S. 1,
Grant
FL
32949
|
Family ID: |
26919871 |
Appl. No.: |
09/930284 |
Filed: |
August 16, 2001 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
60225742 |
Aug 17, 2000 |
|
|
|
Current U.S.
Class: |
114/361 |
Current CPC
Class: |
B63B 17/02 20130101;
B63B 19/02 20130101 |
Class at
Publication: |
114/361 |
International
Class: |
B63B 017/00 |
Claims
What is claimed is:
1. A header for rigidly engaging an upper edge of a boat
windshield, the header comprising an elongated member having a
generally uniform transverse cross-section defined by: an upper
rail having a convexly curved top surface and a bottom defining
first and second respective sides; first and second arms protruding
downwardly from the first and second sides of the upper rail; a
windshield-engaging channel for receiving said boat windshield
defined between the first and second arms; and a first groove
formed within the upper rail and extending inwardly from the first
side of the upper rail.
2. The header claimed in claim 1, wherein the curvature of the
convexly curved top surface increases asymmetrically from the first
side to the second side of the upper rail.
3. The header claimed in claim 2, further comprising: a second
groove positioned generally at a center of the convexly curved top
surface of the upper rail and protruding downwardly thereinto, the
second groove separating the convexly curved top surface into two
sections.
4. The header claimed in claim 2, wherein the top surface is
continuously curved and the curvature increases gradually from the
first side to the second side.
5. The header claimed in claim 2, further comprising a third groove
formed within the upper rail and extending inwardly from the second
side of the upper rail.
6. The header claimed in claim 1, further comprising: at least one
fastener extending from the first groove to a bottom-most portion
of the first arm.
7. A header for rigidly engaging an upper edge of a boat
windshield, the header comprising an elongated member having a
generally uniform transverse cross-section, said cross-section
being defined by: an arm connection portion with a bottom having
first and second sides; an upper rail formed on a top side of the
arm connection portion, said upper rail having an asymmetrical,
convexly-curved top surface; first and second arms protruding
downwardly from the first and second sides of the arm connection
portion, wherein a windshield-engaging channel for receiving said
boat windshield is formed between the first and second arms and
below the arm connection portion; and at least one groove formed
between the upper rail and the arm connection portion and extending
inwardly from the first side of the arm connection portion.
8. The header of claim 7, further comprising: at least one fastener
disposed thereon, extending from the groove to a bottom-most
portion of the first arm.
Description
[0001] This application claims the benefit of priority to U.S.
Provisional Patent Application Ser. No. 60/225,742, which was filed
on Aug. 17, 2000.
FIELD OF THE INVENTION
[0002] The present invention relates to boat windshield assemblies,
and more particularly to extrusion headers that are adapted to be
mounted to the upper extremities of boat windshields and support
canopies.
BACKGROUND OF THE INVENTION
[0003] there are a variety of techniques described in the prior art
for providing an extruded metal finishing header across the top of
a boat windshield. Such headers frequently include means for
attaching a boat canopy or other type of top thereto.
[0004] For example, Lewis (U.S. Pat. No. 3,172,419) discloses a
generally rectangular-shaped channel formed on the underside of an
aluminum extrusion to fit over the upper extremity of a windshield,
the channel being provided on the inner sides to grip the edges of
the glass. The extrusion further includes a flexible locking strip
for attachment to the boat canopy.
[0005] Zimmer et al. (U.S. Pat. No. 2,937,652) discloses another
method of attaching a boat canopy to a top header extrusion. As
shown in FIGS. 1 and 2, extrusion 6 is attached to the upper edge
of windshield 12 of boat 2. The canopy 4 over the cockpit of a boat
2 is typically stretched over the top of the extrusion 6 and
fastened to some type of fastener 8 (see FIG. 2). The canopy must
be pulled tightly in order to prevent it from sagging down into the
cockpit of the boat. Because the canopy 4 must be wrapped tightly
over the top of the extrusion 6, a point of increased wear 10 is
formed at the contact point 10 between the canopy 4 and the
extrusion 6. The force of rough waters, wind, and severe weather on
the canopy 4 only exacerbate the problem by moving the canopy 4
back and forth over contact point 10. As shown in FIG. 2, where a
sharp angle exists on the upper surface of the extrusion, the
contact surface is small and the wear and tear is concentrated at
the angular point.
[0006] Zirkelbach et al. (U.S. Pat. No. 5,189,980) discloses a
header extrusion that relieves the wear and tear on the canopy to
some extent by utilizing a semi-circular top surface on the header
extrusion to disperse the load of the canopy over a larger area of
the extrusion. However, because the canopy is typically held at a
generally right angle to the windshield, only about a half of the
top surface of the semi-circular rail portion is in contact with
the canopy to absorb the load. Consequently, while the load is
spread out over a larger surface area, the surface area is still
relatively small and the canopy wears significantly.
SUMMARY OF THE INVENTION
[0007] It is thus an object of the present invention to provide a
header extrusion that reduces the wear and tear on an attached
canopy.
[0008] It is a further object of the present invention to provide a
header extrusion that is strong and resists deformation caused by
the force of a canopy on the extrusion and the clamping force of
the extrusion against the windshield.
[0009] It is still a further object of the present invention to
provide a header extrusion that is light, easy to manufacture, and
inexpensive.
[0010] The present invention fulfills the above-identified objects
by providing a header for rigidly engaging an upper edge of a boat
windshield and supporting a boat canopy. The header comprises an
elongated member having a generally uniform transverse
cross-section. The cross-section is defined by an upper rail having
a convexly curved top surface and a bottom defining first and
second respective sides. First and second arms protrude downwardly
from the first and second sides of the upper rail. A
windshield-engaging channel for receiving the boat windshield is
formed between the first and second arms. A first groove is formed
within the upper rail and extends inwardly from the first side of
the upper rail. To reduce wear and tear on a boat canopy attached
to the header, the curvature of the convexly curved top surface
increases from the first side to the second side of the upper rail
to maximize the load-bearing contact area between the canopy and
the header. A second groove positioned generally at a center of the
convexly curved top surface of the upper rail and protruding
downwardly thereinto may also be added to separate the convexly
curved top surface into two sections. Additionally, a third groove
formed within the upper rail and extending inwardly from the second
side of the upper rail may be added.
BRIEF DESCRIPTION OF THE DRAWINGS
[0011] the invention will be described in conjunction with the
following drawings in which like reference numerals designate like
elements and wherein:
[0012] FIG. 1 is a perspective view of a conventional boat having a
canopy attached to the windshield top header extrusion;
[0013] FIG. 2 is a side cross-sectional view of the
windshield/canopy connection of the boat illustrated in FIG. 1;
[0014] FIG. 3 is a side cross-sectional view of a first embodiment
of the present invention;
[0015] FIG. 4 is a side cross-sectional view of a second embodiment
of the present invention; and
[0016] FIG. 5 is a side cross-sectional view of a third embodiment
of the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0017] FIG. 3 illustrates header extrusion 20 according to a first
embodiment of the present invention. Extrusion 20 forms a top
header that is fitted securely onto windshield 12. Because
extrusion 20 is an elongated member having a generally uniform
transverse cross-section, it will hereinafter be described with
respect to its cross-sectional shape.
[0018] Arms 22, 24 extend downwardly from opposite ends of a bottom
side of arm connection portion 26 to form channel 32, which is
adapted to fit over a top edge of windshield 12. Teeth 28 are
formed on the inside surfaces of arms 22, 24 to securely hold onto
either the windshield 12 directly, or onto a windshield liner (not
shown) that is fitted over the top portion of windshield 12. Stops
30 are formed on the inside surfaces of arms 22, 24 to prevent
windshield 12 from being pushed too far into the channel 32 and to
assure proper positioning of extrusion 20 on windshield 12.
[0019] Upper rail 34 extends upwardly from the top side of arm
connection portion 26. A groove 36 is formed between upper rail 34
and arm connection portion 26 to provide an attachment point for
fastener 38. Groove 36 extends inwardly into the extrusion 20, but
does not extend so far into the extrusion that it crosses into a
plane formed by the inner surface of arm 22. Fastener 38 is
securely clipped to the extrusion between the groove 36 and a lower
edge of arm 22. Attachment loop 4a of canopy 4 is then attached to
protrusion 38a of fastener 38 to firmly connect canopy 4 to the
windshield 12 via extrusion 20. While the fastener connecting
canopy 4 to extrusion 20 is illustrated as a loop and protrusion,
various other types of fasteners known in the art could be
substituted therefor. For example, a snap-fit fastener is commonly
used in the art.
[0020] Positioning groove 36 between the upper rail 34 and the arm
connection portion 26 strengthens the overall extrusion as compared
to extrusions that position such a groove within an arm of the
extrusion (such as described in U.S. Pat. No. 5,189,980). To ensure
that the extrusion 20 remains tightly attached to the windshield
12, a bending moment is formed between arms 22, 24, which creates a
compressive force that tightly holds the extrusion 20 on the
windshield 12. Where a groove has been formed in the arm, the
bending moment must be transmitted through the portion of the
extrusion that creates the groove. This establishes a weak point in
the extrusion. By positioning the groove 36 above the arm
connection portion, the bending moment is transmitted through the
solid arm connection portion 26 rather than through the structure
that forms the groove 36. The strength of this construction becomes
even more important when one considers the additional bending
moment created by the transmission of the tension of the canopy 4
to the windshield through the extrusion 20.
[0021] When connected to the windshield 12, canopy 4 is tightly
pulled over top surface 34a of upper rail 34. Top surface 34a forms
an asymmetrical curve. The curvature of top surface 34a increases
from a relatively small curvature (large radius of curvature) on
the side of the extrusion having groove 36 to a large curvature
(small radius of curvature) on the side of the extrusion 20 having
arm 24. Consequently, canopy 4 remains in contact with extrusion 20
over a large surface area of top surface 34a, which distributes the
tensile load born by the canopy 4 evenly over the top surface 34a.
The load distribution reduces the wear and tear on the canopy 4 at
the contact point because the load at any one point is reduced as
compared to the prior art extrusions that provide surface support
only over a small area of the top surface of the header.
[0022] FIG. 4 illustrates a header extrusion 50 according to a
second embodiment of the present invention, which is similar to the
first embodiment except for the below-noted differences. Groove 52
of extrusion 50 of the second embodiment extends farther into the
extrusion than groove 36 of extrusion 20 of the first embodiment.
Top surface 54a of upper rail 54 of the second embodiment follows
the same increasingly curved shape as top surface 34a of the first
embodiment, except that groove 54b is added in the middle of the
top surface 54a of the second embodiment. Groove 54b extends
downwardly into the extrusion and is shallow in comparison to
groove 52.
[0023] FIG. 5 illustrates header extrusion 60 according to a third
embodiment of the present invention, which is similar to the second
embodiment except for the addition of groove 66. Groove 66 is
formed between arm connection portion 62 and upper rail 64 of
extrusion 60 and extends inwardly from the side of the extrusion 60
opposite groove 52.
[0024] While it is preferred that extrusions 20, 50, 60 be made of
aluminum because if aluminum's light weight and resistance to
corrosion, those skilled in the art would readily recognize that
any suitable material may be substituted therefor without deviating
from the scope and spirit of the present invention.
[0025] In addition, as illustrated, upper rails 34, 54, 64
preferably are solid to improve the bendability of extrusions 20,
50, 60. Specifically, before installation on a boat, extrusions 20,
50, 60 are subjected to a bending force, which shapes extrusions
20, 50, 60 to fit a particular window curvature design. If the
upper rail portions of the extrusions are hollow, as shown in U.S.
Pat. No. 5,189,980, for example, the extrusions have a tendency to
collapse or deform when subjected to a bending force, especially
one that results in a tight radius of curvature for the extrusion.
According to the present invention, extrusions 20, 50, 60 with
solid upper rails 34, 54, 64 may be bent with a much tighter radius
of curvature than prior art extrusions. This increases the
applicability of extrusions 20, 50, 60 to a much wider variety of
boat designs.
[0026] Finally, while each of elements 20, 50, and 60 have been
described as extrusions, other manufacturing methods could be
employed to construct the present invention.
[0027] It will be understood that various modifications may be made
to the above embodiments without departing from the spirit of the
present invention, the scope of which is to be limited only by the
claims.
* * * * *