# Patent

## Title
Extrusion corner piece

## Abstract

A flange corner piece is provided that is used to provide decoration and sealing to the perimeter of a slide-out room. The slide-out room has an outside wall with a perimeter edge. Elongate extrusions are attached to the perimeter. The extrusions have terminal ends that are located proximate corners on the outside wall. Terminal ends of the extrusions are received by first and second receiving pockets in the flange corner piece. The receiving pockets are made up of walls that overlay portions of the extrusions and constrain it. The first and second receiving pockets affix neighboring extrusions and conceal the corners of the slide-out room.

## Background
BACKGROUND OF THE INVENTION
This present disclosure relates to slide-out rooms, particularly the trim flange that goes around the outside wall of the slide-out. Slide-out rooms reside in an opening in the side wall of an RV, trailer, or other mobile living quarters. The slide-out room provides additional living or storage space when the RV is parked without increasing the overall footprint of the vehicle. The slide-out room must be properly sealed from the outside elements, whether it is in the extended position or the retracted position. Typically, the room is sealed with a face seal that goes around the perimeter of the opening in the sidewall, along with wiper seals that slide on the sidewalls of the room as the room moves in or out. In order to have a mating surface for the face seal, a flange is attached to the perimeter of the outside wall of the slide-out room. Currently this is accomplished through a long extrusion with mitered corners that is attached to the slide-out room. The corners are subsequently covered up and protected with decorative trim pieces. Mitering corners on a room that can be quite large requires precision measurement and attachment to the room. A high level of skill is required. Cutting the extrusion too short or too long results in poor fitment, leaks, and bad aesthetics. Further, the trim pieces are held in with screws that require drilling and tapping to be properly attached to the extrusion. The screws must be no longer than the thickness of the extrusion and trim piece, as any part that extends too far could damage the seal, side wall, or prevent proper closure of the slide-out room. Due to the extreme time pressure when manufacturing an RV, an improved flange system is needed.
SUMMARY OF THE INVENTION
The present disclosure describes a flange system that utilizes corner pieces that receive an extrusion and conceal the end of it. The corner piece allows the extrusion to be cut squarely with a wide tolerance band where the corner piece can still fit and perform its function. The corner piece is held to the slide-out room with the extrusion, so no external fasteners are needed. Each corner piece has two channels, each cannel receives the end of the extrusion. The channels are fixed at ninety degrees to locate and align the extrusions.



BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of this invention has been chosen wherein:
FIG. 1 is a front isometric view of the system;
FIG. 2 is a rear isometric view of the system;
FIG. 3 is a side view of the corner piece;
FIG. 4 is a rear view of the corner piece;
FIG. 5 is a rear isometric view of the corner piece;
FIG. 6 is a front perspective view of the system as installed on an RV with the slide-out room in the extended position;
FIG. 7 is a front perspective view of the system as installed on an RV with the slide-out room in the retracted position;
FIG. 8 is a section view 8-8 of the system as installed on an RV in FIG. 7;
FIG. 9 is a section view 9-9 of the system as installed on an RV in FIG. 7; and
FIG. 10 is a partial view 10 of the corner piece in FIG. 4.



DESCRIPTION OF THE PREFERRED EMBODIMENT
A flange system 10 is shown in FIGS. 1 and 2. The flange system 10 is designed to be affixed to an RV 12, shown in FIGS. 6 and 7, specifically on the outside surface 14 of a slide-out room 16. As is well-known in the art, recreational vehicles, travel trailers, and other mobile living quarters frequently have slide-out rooms 16 to increase living area without increasing the footprint of the vehicle during transport. The slide-out room 16 is received in an aperture in a main wall 18 of the RV 12 and moves between an extended position as shown in FIG. 6 and a retracted position as shown in FIG. 7. The flange system 10 attaches to the perimeter of the outside surface 14 to conceal the gap between the room 16 and the main wall 18 and provide sealing when the room 16 is in the retracted position.
The flange system 10 is comprised of elongate extrusions 20 that are mated to flange corners 22. The RV 12, as shown, has elongate extrusions 20 and flange corners 22 that form a continuous perimeter, but it is also common for the RV 12 to have three or fewer where only a partial perimeter is formed. The elongate extrusions 20, as shown, are common elongate aluminum extrusions. The flange system 10 serves several purposes. First, it provides a decorative trim that conceals the gap between the room 16 and the main wall 18. Second, it provides a sealing surface when the room 16 is in the retracted position as shown in FIG. 6.
The elongate extrusions 20 have an outside wall 28 with an outside facing surface 30 and inside facing surfaces. The inside facing surface is separated into a sealing surface 32 and an overlaying surface 34 by a mounting wall 36. The mounting wall 36 is perpendicular to the outside wall 28 and has mounting holes 38, as shown in FIG. 8. The mounting wall 36 has a room facing surface 37 and an oppositely located surface 39. The outside wall 28 has a lip 41 located on an outside lateral edge 40 and an oppositely located inside lateral edge 42. The elongate extrusions 20 as shown are common aluminum extrusion, but other materials and manufacturing processes are contemplated. The elongate extrusions 20 have a consistent cross-sectional shape along their length. The cross section profile of the flange member 20 is shown in FIG. 8. Terminal ends 24 of the flange member 20 are identical to the section shown in FIG. 8.
The flange corners 22 have a planar base wall 50 with an outside facing surface 52. A portion of the base wall 50 is a bridge portion that is located between the receiving pockets 54, 56 and is shown as a large planar area in FIG. 5 that is thicker than the base wall 50 that is located in the receiving pockets 54, 56. The flange corners 22 are mirror symmetrical about a plane 58 with first and second receiving pockets 54, 56 that receive and fix the terminal ends 24 of the elongate extrusions 20. The plane 58 is perpendicular to the outside facing surface 52. The receiving pockets 54, 56 are orthogonally angled with respect to each other. As shown in FIG. 5, the first receiving pocket 54 has an inner lateral boundary wall 60 and an outer lateral boundary wall 62 that extends away from the outside facing surface 52. The first receiving pocket 54 has a mouth 66 and terminates at a first end surface 64 which serves as a stop for the terminal end 24 of the elongate extrusions 20. A portion of the end surface 64 is located in the receiving pocket 54 and extends toward the lateral boundary wall 60 between the planar base wall 50 and a retaining wall 72. As shown in FIG. 5, the end surface 64 extends to the corner wall 74. The outer lateral boundary wall 62 is perpendicular to the base wall 50 and extends to a relatively narrow step wall 68 that is parallel to the planar base wall 50. As shown in FIG. 3, the step wall 68 extends to a knee wall 70 that is parallel to the outer lateral boundary wall 62. The knee wall 70 extends into the retaining wall 72 that is spaced from and parallel to the base wall 50. A corner wall 74 extends perpendicularly from the retaining wall 72 and terminates at a lateral edge 76. The corner wall 74 has inside facing surface 73 and an oppositely located outside facing surface 75, shown in FIG. 10. The second receiving pocket 56 has an inner lateral boundary wall 80 and an outer lateral boundary wall 82 that extends away from the outside facing surface 52. The second receiving pocket 56 has a mouth 86 and terminates at a first end surface 84 which extends between the planar base wall 50 and a retaining wall 92. A portion of the end surface 84 is located in the receiving pocket 56 and extends toward the lateral boundary wall 60 between the planar base wall 50 and a retaining wall 92. As shown in FIG. 5, the end surface 84 extends to the corner wall 94. The outer lateral boundary wall 82 is perpendicular to the base wall 50 and extends to a relatively narrow step wall 88 that is parallel to the planar base wall 50. The step wall 88 extends to a knee wall 90 that is parallel to the outer lateral boundary wall 82. The knee wall 90 extends into the retaining wall 92 that is spaced from and parallel to the base wall 50. A corner wall 94 extends perpendicularly from the retaining wall 92 and terminates at a lateral edge 96. The corner wall 94 has inside facing surface 93 and an oppositely located outside facing surface 95, shown in FIG. 10.
The corner walls 74, 94 have a thinned area 104, 114 that is made to overlay the mounting wall 36. The thinned area 104, 114 transitions to a thick area 106, 116 at the end surface 64, 84, as is visible in FIG. 5. The thick area 106 has an inside facing surface 107 that is coplanar with the room facing surface 37 when the elongate extrusion 20 is inserted into receiving pocket 54. Similarly, the thick area 116 has an inside facing surface 117 that is coplanar with the room facing surface 37 when the elongate extrusion 20 is inserted into receiving pocket 56. The thickness of the thinned area 104, 114 and the mounting wall 36 is substantially equal to the thickness of the thick area 106, 116, to ensure the room facing surface 37 and corner walls 74, 94 form a continuous surface to mate with the side walls of the slide-out room 16.
Apertures 108, 118 are located at the end of the outer lateral boundary walls 62, 82. The apertures 108, 118 allow liquids such as water to drain out and prevent it from becoming trapped, where freezing can cause parts to be distorted or broken.
It is understood that while certain aspects of the disclosed subject matter have been shown and described, the disclosed subject matter is not limited thereto and encompasses various other embodiments and aspects. No specific limitation with respect to the specific embodiments disclosed herein is intended or should be inferred. Modifications may be made to the disclosed subject matter as set forth in the following claims.

## Claims

1. A flange corner comprising:
a base wall with a first receiving pocket and a second receiving pocket;
said first receiving pocket having a first inner lateral boundary wall extending perpendicularly from said base wall and a first outer lateral boundary wall extending perpendicularly from said base wall being spaced from and substantially parallel to said first inner lateral boundary wall, a first end surface extending perpendicularly from said base wall and being perpendicular to said first inner and said first outer lateral boundary walls and said first end surface spanning between said first inner lateral boundary wall and said first outer lateral boundary wall, a first retaining wall being spaced from and substantially parallel to said base wall, said first retaining wall being connected to said first end surface and said first outer lateral boundary wall said first retaining wall terminating between said first outer lateral boundary wall and said first inner lateral boundary wall, a first corner wall extending perpendicularly from said first retaining wall spaced from and located between said first inner and outer lateral boundary walls, said first end surface extending continuously from between said base wall and first retaining wall and said first end surface extending adjacently connected along said first corner wall and said first end surface being perpendicular to first said corner wall, said first end surface adjacent to said first corner wall terminating between said first inner and said first outer lateral boundary wall, said first receiving pocket being open between said first corner wall and said first inner lateral boundary wall;
second receiving pocket having a second inner lateral boundary wall extending perpendicularly from said base wall and a second outer lateral boundary wall extending perpendicularly from said base wall being spaced from and substantially parallel to said second inner lateral boundary wall, a second end surface extending perpendicularly from said base wall and being perpendicular to said second inner and said second outer lateral boundary walls and said second end surface spanning between said second inner lateral boundary wall and said second outer lateral boundary wall, a second retaining wall being spaced from and substantially parallel to said base wall, said second retaining wall being connected to said second end surface and said second outer lateral boundary wall, said first retaining wall terminating between said second outer lateral boundary wall and said and said second inner lateral boundary wall, a second corner wall extending perpendicularly from said second retaining wall spaced from and located between said second inner and outer lateral boundary walls, said second end surface extending continuously from between said base wall and said second retaining wall and said second end surface extending adjacently connected along said second corner wall and said second end surface being perpendicular to said corner wall, said second end surface adjacent to said second corner wall terminating between said second inner and said second lateral boundary wall, said second receiving pocket being open between said second corner wall and said second inner lateral boundary wall;
said first receiving pocket orthogonally oriented with respect to said second receiving pocket, said base wall extending beyond said first and second receiving pockets and connecting said first and second receiving pockets.

2. The flange corner of claim 1, wherein said first and second corner walls being joined.

3. The flange corner of claim 1, wherein a portion of said base wall is a bridge section extending between said first and said second end surfaces, said bridge section having an outer perimeter surface aligned with an outer surface of said first and second outer lateral boundary walls, said first corner wall intersecting said second corner wall.

4. The flange corner of claim 1, wherein said first and second receiving pockets contact a plane of symmetry.

5. The flange corner of claim 1, wherein said corner walls are connected to said base wall opposite said corresponding receiving pockets and beyond said corresponding end surfaces.

6. A flange corner adapted to be affixed between a first and second elongate extrusion and be retained therebetween, said first and second elongate extrusion each having an outside wall with an outside facing surface and a sealing surface located opposite to said outside facing surface, said first and second elongate extrusions including and a mounting wall extending substantially perpendicularly from said outside wall, each said elongate extrusion having terminal ends, said flange corner comprising:
a base wall with a first receiving pocket and a second receiving pocket;
said first receiving pocket having a first inner lateral boundary wall extending perpendicularly from said base wall and a first outer lateral boundary wall extending perpendicularly from said base wall being spaced from and substantially parallel to said first inner lateral boundary wall, a first end surface extending perpendicularly from said base wall and being perpendicular to said first inner and said first outer lateral boundary walls and said first end surface spanning between said first inner lateral boundary wall and said first outer lateral boundary wall, a first retaining wall being spaced from and substantially parallel to said base wall, said first retaining wall being connected to said first end surface and said first outer lateral boundary wall said first retaining wall terminating between said first outer lateral boundary wall and said first inner lateral boundary wall, a first corner wall extending perpendicularly from said first retaining wall spaced from and located between said first inner and outer lateral boundary walls, said first end surface extending continuously from between said base wall and first retaining wall and said first end surface extending adjacently connected along said first corner wall and said first end surface being perpendicular to first said corner wall, said first end surface adjacent to said first corner wall terminating between said first inner and said first outer lateral boundary wall, said first receiving pocket being open between said first corner wall and said first inner lateral boundary wall, a portion of said first end surface between said first corner wall and said first inner lateral boundary wall in alignment with said sealing surface of one of said extrusions when said one extrusion is inserted in said first receiving pocket;
second receiving pocket having a second inner lateral boundary wall extending perpendicularly from said base wall and a second outer lateral boundary wall extending perpendicularly from said base wall being spaced from and substantially parallel to said second inner lateral boundary wall, a second end surface extending perpendicularly from said base wall and being perpendicular to said second inner and said second outer lateral boundary walls and said second end surface spanning between said second inner lateral boundary wall and said second outer lateral boundary wall, a second retaining wall being spaced from and substantially parallel to said base wall, said second retaining wall being connected to said second end surface and said second outer lateral boundary wall, said first retaining wall terminating between said second outer lateral boundary wall and said and said second inner lateral boundary wall, a second corner wall extending perpendicularly from said second retaining wall spaced from and located between said second inner and outer lateral boundary walls, said second end surface extending continuously from between said base wall and said second retaining wall and said second end surface extending adjacently connected along said second corner wall and said second end surface being perpendicular to said corner wall, said second end surface adjacent to said second corner wall terminating between said second inner and said second lateral boundary wall, said second receiving pocket being open between said second corner wall and said second inner lateral boundary wall, a portion of said second end surface between said second corner wall and said second inner lateral boundary wall in alignment with said sealing surface of another of said extrusions when said another extrusion is inserted in said first receiving pocket;
said first receiving pocket orthogonally oriented with respect to said second receiving pocket, said base wall extending beyond said first and second receiving pockets and connecting said first and second receiving pockets.

7. The flange corner of claim 6, wherein said inner lateral boundary walls align with said extrusions when said extrusions are within said first and second pockets.

8. The flange corner of claim 6, wherein surfaces adjacent inner lateral walls and said end surfaces align with said sealing surfaces of said extrusions when said extrusions are located within said receiving pockets.