Frame assembly and environmental enclosure
A frame assembly for an environmental enclosure including a plurality of channel-shaped members each including an end wall, opposed spaced side walls and an opening opposite the end wall adapted to receive and retain an end cap for retaining a film over the frame assembly having an integral internal channel which receives a connector element for interconnecting the frame members into a rectangular frame assembly and the frame assemblies are then interconnected to form an environmental enclosure. In one embodiment, the channel-shaped frame members include a generally L-shaped connector portion integral with one of the side walls for interconnecting the frame assemblies in side to side and end to end relation. In the other embodiment, the rectangular frame assembly has a height equal to the height of the environmental enclosure and transverse bracing elements having a U-shaped connector plate including transverse slots received in the internal channel.
This application claims priority to Provisional Patent Application Ser. No. 60/579,410 filed in the U.S. Patent and Trademark Office on Jun. 14, 2004.
FIELD OF THE INVENTIONThis invention relates to an environmental or contaminant shield or enclosure which prevents airborne contaminants from contacting a part received within or transmitted through the environmental or contaminant enclosure. More particularly, this invention relates to a frame assembly for an environmental or contaminant shield or enclosure and the shield or enclosure.
BACKGROUND OF THE INVENTIONEnvironmental or contaminant shields or enclosures, commonly referred to as “clean tunnels,” are utilized by many industries to prevent airborne contaminants from contacting a part received within or transmitted through the environmental or contaminant shield or enclosure. Such enclosures are used, for example, in an automotive paint facility, wherein the vehicle body is conveyed through clean tunnels between the several steps performed in the paint shop including, for example, sanding, tack-off (typically performed by feather dusters), paint booths and ovens to prevent airborne contaminants, including particulate and waterborne contaminants, from contacting the vehicle body following sanding, cleaning, tack-off and painting. A typical automotive paint facility may include over a mile of clean tunnels. As will be understood, however, other manufacturing and assembly facilities also use clean tunnels or enclosures during assembly or manufacture, including downtime. A typical clean tunnel or enclosure includes a frame assembly comprised of like channel-shaped frame members formed from sheet metal, typically steel, each having an open end, including an end or bottom wall and opposed side walls having opposed inwardly projecting end portions, wherein an end cap is received in the opening end of the channel-shaped frame members which secures a flexible film stretched over the frame members forming the clean tunnel as disclosed, for example, in U.S. Pat. Nos. 4,860,778 and 5,906,078.
As disclosed in such patents, the like channel-shaped frame members are then interconnected in end to end relation into a rectangular frame and the flexible sheet is stretched over the frame members and the rectangular frame members are then interconnected in side to side or end to end relation to form a U-shape clean tunnel or enclosure, preventing airborne contaminants from contacting a part received in the clean tunnel or enclosure. In a typical application, the frame members are first interconnected in end to end relation to form a rectangular frame, a flexible film is stretched over the rectangular frame and secured by end caps and the rectangular frame members with the flexible film are then interconnected in end to end and side to side relation with fasteners or clips. However, because the open ends of the channel-shaped frame members are closed by the end caps which secure the flexible film, assembly of the rectangular frame members with the end caps and flexible film require special clips or fasteners which penetrate the channel-shaped frame members making assembly of the frame members difficult, requiring special tools or parts and potentially reducing the structural integrity of the frame assembly.
It would also be desirable to easily remove and replace damaged flexible film after assembly, which comprises a majority of the surface area of the clean tunnel or enclosure, without special tools and to form the frame members from extruded aluminum to form a light weight, more rigid rugged construction. The environmental enclosure and frame assembly of this invention solves the problems associated with the prior art described above, including frame members which may be easily and securely assembled and wherein the flexible film may be easily assembled on the frame members or removed and replaced if damaged.
SUMMARY OF THE INVENTIONThe frame assembly for an environmental enclosure of this invention includes a plurality of interconnected channel-shaped frame members, wherein each of the frame members includes a first end wall, opposed spaced side walls extending generally perpendicular to and integral with the first end wall and an opening opposite the first end wall adapted to receive and retain an end cap for retaining a film over the frame assembly. As thus far described, the channel-shaped frame members may be generally similar to the frame members disclosed in the above-referenced U.S. patents. However, the frame members of this invention further include an integral internal retainer channel within the channel-shaped frame members including a retainer wall integral with and extending generally perpendicular to one of the side walls, spaced from the end wall, for receiving a connector element interconnecting the channel-shaped frame members into a rectangular frame or for interconnecting abutting transverse frame members for braces or the like. In a preferred embodiment, the internal retainer wall is generally L-shaped, including a first portion integral with and extending generally perpendicular to the side wall and an end portion extending toward the first end wall of the channel-shaped frame member and in the disclosed embodiment, the first end wall further includes an internal retainer wall extending toward the end portion of the generally L-shaped retainer wall, forming an integral internal channel for receiving a retainer element as described. In a preferred embodiment, the channel-shaped frame members are formed from extruded aluminum, forming a light weight rigid construction.
In one of the disclosed embodiments of the channel-shaped members, the first side wall which includes the internal retainer channel, has a second end wall extending from and integral with the first side wall and the opening which receives the end cap is adjacent the second side wall and the opening is defined by parallel enlarged bead-shaped portions to receive and retain the end cap which retains a film overlying the frame assembly. In the other disclosed embodiments, the end portions of the side walls are U or hook-shaped each having an enlarged bead-shaped portion extending toward the first end wall.
In one of the preferred embodiments of the frame assembly of this invention, the channel-shaped frame members further include an L-shaped retainer portion including an end wall portion integral with a side wall, preferably a side wall opposite the integral internal channel described above, extending parallel to the first end wall and preferably aligned with the first end wall, and an end portion integral with and extending generally perpendicular to the end wall portion of the retainer portion forming a channel-shaped retainer or connector portion for interconnecting adjacent channel-shaped members in side to side relation, wherein the channel-shaped frame members of the frame assembly include a first plurality of channel-shaped members each having a generally L-shaped connector portion extending from one side wall and a second plurality of channel-shaped members which are a mirror image of the first channel-shaped members, and wherein the L-shaped retainer portions are aligned in side to side abutting relation and a fastener interconnects the first and second channel-shaped members.
The channel-shaped frame members of this invention are first assembled into rectangular frame assemblies, wherein the ends are preferably mitered or cut at a 45 degree angle and an L-shaped connector element having a first leg portion is received in the internal retainer channel of one frame member and a second leg portion is received in an internal channel of a perpendicular second channel-shaped frame member forming a rectangular frame assembly. The rectangular frame assembly is then covered with a thin, preferably transparent film and secured by end caps, such that each rectangular frame assembly is covered by a thin transparent film. In the disclosed embodiment of the frame assembly of this invention having a generally L-shaped retainer portion, the rectangular frame assemblies are then secured in side to side relation by a fastener, such as a clip, rivet or the like. In a preferred alternative embodiment, the frame assemblies are interconnected in side to side relation by a U-shaped retainer member having end portions received around the adjacent channel-shaped frame members and secured by suitable fasteners, such as screws, bolts, or the like. The frame assemblies may be rectangular or square. In one preferred embodiment, a rectangular frame assembly is first formed having a height equal to the desired height of the environmental enclosure and the rectangular frame assemblies include cross members having end portions secured to the rectangular frame assembly by U-shaped retainer members received within the cross members having slots received in the opposed end portions of the internal retainer channel, forming a light weight rigid assembly. The preferred alternative embodiment of the frame assembly has the advantage that the frame assembly is more rigid and does not require mirror image channel-shaped frame members and is thus less expensive to manufacture and assemble.
In a preferred embodiment of the frame assembly of this invention, the channel-shaped frame members are extruded, preferably extruded aluminum, forming a rigid lightweight frame assembly which is easily assembled or disassembled, as required. Further, the thin flexible film may be easily secured to or replaced on the frame assemblies by end caps which, in a preferred embodiment, includes a planar end portion and projecting generally parallel outwardly bowed legs which are received between the parallel enlarged bead-shaped portions defining the opening to the channel-shaped frame members, securely retaining the flexible film.
As will be understood, the disclosed embodiments of the frame assembly and channel-shaped frame members is provided for illustrative purposes only and various modifications may be made to the frame assembly and channel-shaped frame members within the purview of the appended claims as described further below.
BRIEF DESCRIPTION OF THE DRAWINGS
As will be understood, the embodiments of the frame assembly and environmental enclosure of this invention disclosed in the figures are for illustrative purposes only and various modifications may be made to the frame assembly and environmental enclosure of this invention with the purview of the appended claims as described further below.
The embodiment of the environmental enclosure or clean tunnel 20 shown in
As set forth below, the frame members 26 are preferably interconnected in end to end relation to form rectangular frame assemblies 24 as shown in
In one preferred embodiment, the first end caps 64 include a planar end portion 66 and projecting generally parallel outwardly bowed legs 68. As best shown in
Once the rectangular frame assemblies 24 and 24A are assembled, as described above, the embodiments of the rectangular frame members 24 and 24A may be interconnected in side to side relation by the connector portions 34, as now described, with reference to
In an embodiment of the frame assembly shown in
The embodiment of the frame assemblies shown in
It is important to note that the embodiment of the frame assembly of this invention shown in
The alternative preferred embodiment of the environmental enclosure or clean tunnel 120 shown in
As shown in
As described above, the rectangular frame assemblies 124 may be formed by mitering the ends of the channel-shaped frame members 132 at a 45 degree angle as shown in
As will be understood from the above description of the preferred alternative embodiment of the environmental enclosure 120 shown in FIGS. 8 to 17, the assembly of the environmental enclosure is similar to the environmental enclosure 20 shown in FIGS. 1 to 7. That is, the rectangular frame assemblies 124 may be first assembled, as described above, and the rectangular frame members may then be covered with a flexible, preferably transparent film 128 and secured by end caps 164. As described above, the flexible film 128 is then preferably heated to stretch the film over the rectangular frame assemblies 124 and the flexible film 128 may be easily replaced if damaged following assembly of the environmental enclosure. As set forth above, the embodiment of the environmental enclosure 120 and channel-shaped frame members 132, 202 and 212 have several advantages over the environmental enclosure 20 and channel-shaped frame members 26 described above, including reduced costs of manufacturing and assembly and increased rigidity. However, both embodiments provide important advantages over the prior art, including reduced weight, ease of assembly and easy replacement of the flexible film. As set forth above, the channel-shaped frame members may be formed from extruded aluminum making the environmental enclosure or clean tunnel 20, 120 light in weight and relatively rigid, but having sufficient flexibility for ease of assembly. The environmental enclosure or clean tunnel may be fixed directly to the floor, such as a concrete floor or steel platform using power actuated fastening systems, such as pins, anchor bolts or the like. The upper rectangular frame assemblies may also be supported by the building structure, using brackets, cables or the like.
As will be understood from the above description of the preferred embodiments of the frame assemblies and environmental enclosures of this invention, various modifications may be made within the purview of the appended claims. For example, the opening to the channel-shaped portion or channel-shaped members may be configured to receive other end caps as disclosed, for example, in the prior art. Further, any suitable fasteners may be utilized to interconnect the adjacent the channel-shaped frame members or the frame members to the connector plates described above., including machine screws, bolts or the like The frame assemblies shown in FIGS. 1 to 7 may be square, as shown, or rectangular with transverse bracing elements as disclosed in FIGS. 8 to 17. Finally, as described above, the environmental enclosure or clean tunnel of this invention may have any configuration depending upon the application. That is, the enclosure may include end walls at various locations and venting may be provided, as required. Having described alternative embodiments of the environmental enclosure, frame assemblies and channel-shaped frame members of this invention, the invention is now claimed as follows.
Claims
1. A frame assembly for an environmental enclosure, comprising:
- a plurality of channel-shaped members, each channel-shaped member including a first end wall, opposed spaced side walls extending generally perpendicular to and integral with said first end wall, an opening opposite said first end wall adapted to receive and retain an end cap for retaining a film over said frame assembly, and an integral internal retainer channel including a wall integral and generally perpendicular to one of said side walls spaced from said first end wall forming an internal channel with said first end wall; and
- said plurality of channel-shaped frame members including a first channel-shaped frame member in abutting relation with a second channel-shaped frame member and a retainer element received in said internal channel of said first channel-shaped frame member interconnecting said first and second channel-shaped frame members.
2. The frame assembly as defined in claim 1, wherein said retainer element includes a first leg portion received in said internal retainer channel of said first channel-shaped frame member and a second leg portion received in said internal retainer channel of said second channel-shaped frame member.
3. The frame assembly as defined in claim 2, wherein said second channel-shaped frame member extends generally perpendicular to said first channel-shaped frame member and said retainer element is generally L-shaped.
4. The frame assembly as defined in claim 1, wherein said first end wall of said plurality of channel-shaped frame members include an internal wall integral with and extending generally perpendicular to said first end wall extending toward said wall integral with and generally perpendicular to one of said side walls forming said internal channel.
5. The frame assembly as defined in claim 1, wherein said wall integral with and generally perpendicular to one of said side walls is generally L-shaped including an end portion extending toward said first end wall.
6. The frame assembly as defined in claim 1, wherein said opening opposite said first end wall includes opposed enlarged parallel bead-like portions at least one of which extends toward said first end wall adapted to receive and retain an end cap.
7. The frame assembly as defined in claim 1, wherein one of said opposed spaced side walls include a U-shaped end portion.
8. The frame assembly as defined in claim 7, wherein said U-shaped end portions of said opposed spaced side walls include an end portion extending toward said first end wall.
9. The frame assembly as defined in claim 1, wherein said plurality of channel-shaped frame members each include an integral connector portion including an end wall integral with one of said opposed side walls extending generally parallel to said first end wall having an end portion extending generally perpendicular to said end wall of said connector portion spaced from said one of said opposed side walls forming an L-shaped connector portion, and said generally L-shaped connector portion of said first channel-shaped frame member engaging said generally L-shaped connector portion of a third channel-shaped frame member and a connector element interconnecting said generally L-shaped connector portions of said first and third channel-shaped members.
10. The frame assembly as defined in claim 1, wherein one of said side walls includes an integral end portion extending toward an opposite side wall having a U-shaped portion extending toward said first end wall.
11. A frame assembly for an environmental enclosure, comprising:
- a plurality of channel-shaped frame members, each of said channel-shaped frame members including a first end wall, opposed spaced side wall integral with and extending generally perpendicular to said first end wall, an opening opposite said first end wall having parallel sides adapted to receive and retain an end cap for retaining a film over said frame assembly, and an integral internal channel within said channel-shaped frame members including a first generally L-shaped internal channel wall portion integral with one of said side walls including a first portion integral with and extending generally perpendicular to said one of said side walls and an end portion extending toward said first end wall and a second internal channel wall integral with and extending generally perpendicular to said first end wall portion extending toward said second end portion of said first generally L-shaped internal wall portion.
12. The frame assembly as defined in claim 11, wherein said frame assembly includes a first channel-shaped frame member in abutting relation with a second channel-shaped frame member and a retainer element in one of said internal channels within one of said first and second channel-shaped members interconnecting said first and second channel-shaped frame members.
13. The frame assembly as defined in claim 11, wherein said connector element includes a first leg portion received in said internal channel of said first channel-shaped frame member and a second leg portion received in said internal channel of said second channel-shaped frame member interconnecting said first and second channel-shaped frame members.
14. The frame assembly as defined in claim 13, wherein said leg portions of said connector element include a plurality of teeth forming an interference fit with said internal channels of said first and second channel-shaped frame members.
15. The frame assembly as defined in claim 11, wherein said opening opposite said first end wall includes parallel enlarged bead-shaped portions for retaining an end cap in said opening.
16. The frame assembly as defined in claim 15, wherein said side walls each include a U-shaped end portion having an said enlarged bead-shaped portion at an end of said U-shaped portions.
17. The frame assembly as defined in claim 11, wherein said one of said side walls include a second end wall extending generally parallel to and opposite said first end wall defining said opening adjacent the other of said side walls.
18. The frame assembly as defined in claim 17, wherein said opening is rectangular having parallel enlarged bead-shaped portions for retaining an end cap.
19. The frame assembly as defined in claim 11, wherein each of said plurality of channel-shaped frame members includes an integral retainer portion including a first retainer wall portion integral with a side wall opposite said one of said side walls extending generally parallel to said first end wall and a second retainer wall portion integral and extending generally parallel to said first wall portion.
20. A frame assembly for an environmental enclosure, comprising:
- a plurality of interconnected frame members, each of said frame members including a channel-shaped portion having a first end wall portion, opposed spaced side walls extending generally perpendicular to and integral with said first end wall portion defining an open end opposite said first end wall portion, said side walls having opposed inwardly projecting portions adjacent said open end adapted to receive and retain an end cap, and a connector portion integral with said channel-shaped portion including a second end wall portion generally aligned with said first end wall portion extending generally perpendicular to and integral with said second end wall portion spaced from an adjacent side wall portion;
- said plurality of interconnecting frame members including two frame members having abutting leg portions; and
- a fastener interconnecting said leg portions.
21. The frame assembly as defined in claim 20, wherein said leg portion has a length less than said side walls.
22. The frame assembly as defined in claim 20, wherein said two frame members are mirror images of each other.
23. The frame assembly as defined in claim 20, wherein said inwardly projecting portions of said side walls are hook-shaped.
24. The frame assembly as defined in claim 23, wherein said hook-shaped projecting portions are U-shaped each including a first portion extending generally perpendicular to said side walls and an end portion extending generally parallel to said side walls.
25. The frame assembly as defined in claim 24, wherein said end portion of said hook-shaped portion has a greater thickness than said first portion and rounded end surfaces.
26. The frame assembly as defined in claim 20, wherein said side walls include an outer side wall and an inner side wall adjacent said connector portion, and said inner side wall including an outwardly projecting end portion adjacent said open end overlying said second bottom wall portion, such that said two side frame members have opposed projecting end portions adapted to receive a second end cap.
27. The frame assembly as defined in claim 20, wherein one of said side walls of said frame members includes an integral generally L-shaped web portion spaced from said first bottom wall portion having an end portion extending toward said first bottom wall portion, and said first bottom wall portion including an opposed web portion, wherein said web portions are adapted to receive an L-shaped connector interconnecting said frame members in end to end relation.
28. A frame assembly for an environmental enclosure, comprising:
- a first plurality of frame members each including a channel-shaped portion having a first end wall portion, a first side wall extending generally perpendicular to and integral with said first end wall portion, a second side wall spaced from said first side wall extending generally perpendicular to and integral with said first end wall portion, said first side wall including an end portion extending toward said second side wall and said second side wall including an end portion extending toward said first side wall, and a connector portion including a second end wall portion integral with said second side wall generally aligned with said first end wall portion and a leg portion spaced from said second side wall extending generally perpendicular to and integral with said second end wall portion having a length less than said side wall;
- a second plurality of frame members each being a mirror image of said first plurality of frame members, each including a first end wall portion, a first side wall extending generally perpendicular to and integral with said first end wall portion, a second side wall spaced from said first side wall extending generally perpendicular to and integral with said first end wall portion, said first end wall portion including an end portion extending toward said second side wall, said second side wall including an end portion extending toward said first side wall and a connector portion including a second end wall portion integral with said second side wall aligned with said first end wall portion and a leg portion spaced from said second side wall extending generally perpendicular to and integral with said second end wall portion, wherein said leg portions of one of said first plurality of frame members and said leg portion of one of said second plurality of frame members are abutting; and
- a fastener interconnecting said leg portions of said one of said first plurality of frame members to said leg portion of said one of said second plurality of frame members.
29. The frame assembly as defined in claim 28, wherein said end portions of said first and second side walls are hook-shaped adapted to receive and retain an end cap for securing a flexible film to said frame members.
30. The frame assembly as defined in claim 29, wherein said hook-shaped portions of said side walls are U-shaped, including a first portion extending generally perpendicular to said side walls and an end portion extending generally parallel to said side walls.
31. The frame assembly as defined in claim 29, wherein said hook-shaped end portions of said side walls have a greater thickness than said first portion, and rounded end surfaces.
32. The frame assembly as defined in claim 28, wherein said first side wall of said first and second plurality of frame members includes an integral generally L-shaped web portion having an end portion extending toward said first bottom wall portion and said first bottom wall portion including an opposed web portion for receiving an L-shaped connector interconnecting said first and second plurality of frame members to a third plurality of frame members in end to end relation.
Type: Application
Filed: Sep 30, 2004
Publication Date: Jan 5, 2006
Inventors: Claudio Salzano (Livonia, MI), Roberto Tkatchuk (Sao Paulo), Joseph Klobucar (Canton, MI), David Cole (Ann Arbor, MI), Steven Parzuchowski (Livonia, MI), David Buzzard (Plymouth, MI)
Application Number: 10/955,388
International Classification: E04B 9/00 (20060101);