Self-gripping rack for cantilevered tanks
A flexible system for holding articles such as propane tanks. Straps are arranged around and over three tanks in order to support the outer tanks in a cantilevered fashion over another row of tanks which only has two tanks. Spacers may be inserted between the three tanks to adjust the necessary dimensions for truck. The straps may take a number of configurations and may be held by different locking devices for holding the straps. The straps may also include hooks for attachment to eyes on the tanks.
This Non-Provisional Application claims priority under 35 U.S.C. § 119 (e) on Provisional Application No. 60/837,625 filed on Aug. 15, 2006, the entire contents of which are incorporated by reference.
BACKGROUND OF INVENTION1. Field of the Invention
The present invention relates generally to a self-gripping flexible rack for stacking articles such as propane tanks and more particularly to a self-gripping flexible rack using straps and spacers between the tanks.
2. Description of the Background Art
Various types of racks are known for stacking and transporting articles such as propane tanks. With their round configuration, it is difficult to transport a large number of tanks due to legal limitations on the size of the truck. In addition, the racks may be heavy and bulky, thus taking up additional space and adding an extra load to the truck, leading to increased fuel usage. It is also often necessary to use a crane or multiple people to place the rack on the truck, leading to increased costs.
U.S. Pat. No. 5,735,412 describes a rack system which is a major improvement over prior art systems. In this rack system, a pair of holders, each having curved sides to match the shape of the propane tank, are joined by a flexible strap. The strap acts as a seat for an additional tank placed between the original two tanks onto which the holders are placed. Because of the small size of the holders and strap, it is possible to carry additional tanks on the same size truck. The weight of such rack is considerably less than in prior art systems, which reduces the weight on the truck and allows for easy installation by a single person. In this system, the strap is connected to the holder by sewing the end of the strap to make a loop and inserting a bolt through the holder and the loop to fasten it in position. In order to prevent any damage to the paint on the tanks, pads are placed along the contacting surfaces of the holders.
While this system was a major improvement over prior art devices, the placing of the pads requires considerable time, using skilled labor and laboratory conditions to install. When pads wear out and need to be replaced, it is necessary to sand the metal to acquire a clean surface. As a result, the metal parts must be relatively thick so that multiple sandings do not reduce the strength of the holder. The holders must then be heavier than would otherwise be necessary. The loop formed by sewing the end of the strap is weaker than the other parts of the system and accordingly limits the amount of weight the system can hold. Also, the operations of sewing a strap and inserting a bolt require a certain amount of time and cost.
Thus, it is important to provide some type of stacking system and rack for supporting the tanks in a manner in which it holds the maximum number of tanks within the truck to further reduce shipping cost. Further, the arrangement must be such that the tanks are firmly held and easily handled when placing them on the truck and removing them from the truck.
SUMMARY OF THE INVENTIONAccordingly, the present invention provides a rack for stacking articles such as propane tanks on a truck or other vehicle.
The present invention also provides a rack on which articles can be shipped without damage.
The present invention further provides a lightweight rack which is easily installed manually.
The present invention further provides a system which is easily assembled by unskilled labor at a low cost.
The present invention still further provides a rack for holding cantilevered tanks firmly in place.
The present invention still further provides a rack having spacers for separating tanks.
The present invention provides arrangements of strapping used as a rack for holding cantilevered tanks with various strap holders for spacing the tanks and tightening the load.
The present invention is accomplished by providing strapping which surrounds a variety of tanks to hold them together in a manner to form a cantilever arrangement whereby the tanks are held in a row over a smaller number of tanks. The straps are joined using a variety of holding devices which may also include spacers to provide appropriate spacing in between tanks.
The present invention will become more fully understood from the detailed description given below and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein:
Referring to the drawings, wherein like reference numerals designate identical or corresponding parts throughout the several views, and more particularly to
The strap starts at point A and extends along the bottom side of the right hand rack through two cutouts. It then proceeds under the center tank and through cutouts on the bottom edge of the left hand rack. The strap then extends under and around the left hand tank and extends over the top of the center tank and right hand tank and then down and under the right hand tank to return to point A. At this point, the strap extends up the right hand side of the right hand rack. When it reaches the top of the right hand rack, the strap is placed over itself at a point between the center and right hand tanks. By looping this over, portions of the strap that extend horizontally across the top to the right hand tank support firmly the right hand rack. It would be also possible to sew or otherwise connect the two parts of the strap together at point D rather than looping it over the top. At this point, the strap extends down along the left hand side of the right hand rack through the appropriate cutouts and also extends under the center tank. Then it extends up the right hand side of the left hand rack and loops over the top portion of the strap at point C in a fashion similar to that at point D. The strap then extends down the left hand side of the left hand rack and ends at point B. Two ends of the strap may be anchored by sewing, by using an anchor described later or may be held by the friction developed in the cutouts. By strapping three tanks and two holders together in this fashion, it is possible for the assembly to be lifted by a forklift by extending forks under the racks, or by lifting from above by pulling up the strap along its top section, such as to the left of point C and to the right of point D. When these units are placed in a stack, the tanks above force downwardly on the upper racks and firmly hold the tanks in position.
While many propane tanks are simply cylinders in shape, many others also have adjoining parts which complicate their shape. Thus, in addition to the cylindrical tank itself, the article may have feet 74 in which the tank rest in its final position. On the opposite side, a filler port and valve arrangement 76 may be present. When these types of tanks are being carried, it is necessary to properly space tanks in order that damages are not done to these devices.
The strap starts at point A between the left tank and the center tank, extends around the left hand tank and returns to point A. The strap then continues over the top of the center tank to point C and on around the entire center tank to return to point C and then continue on to the right hand tank, by way of point B. The strap extends around the right hand tank and returns to point B. As is seen, the strap is doubled along the top part of the center tank and is also doubled from point A to the left hand tank and from point B to the right hand tank. At points A, B and C, an anchoring is preferably fashioned to connect the loose end strap and also to connect the two overlapping straps together. Various arrangements, can be described below, can be used to connect the layers of strapping together at these points.
One device for locking straps is shown in
While this arrangement has been shown with an H-shaped opening, similar arrangements can be made with other shaped openings. Even a simple linear opening can be used if the shim is used there behind as a locking device. Other locking devices can be any number of shapes, such as a rod, as long as one dimension is greater than the opening to prevent it from being pulled through.
Another device for holding the strap could be a single link of a large chain. In
It is also possible to use a chain link in a different fashion in conjunction with the flat plate arrangement described above. In place of a shim or rod placed behind the flat plate, it is possible to place the link in such a position. It is possible to thread the strap through the opening in the link. If desired, or if the particular arrangement requires, it is possible to cut an opening in one side of the link in order to provide an opening in which the strap can be inserted. It would even be possible to use a second link in conjunction with the link shown in
The particular locking device used for the strap may depend upon the physical configuration of the straps which are being held in the presence of solid objects, such as the tanks nearby.
As described above, government regulations limit the size of the truck carrying the tanks. These regulations specify both the height and the width of the load. Since propane tanks come in different sizes and since trucks have different heights of their load bed, it is sometimes possible to adjust the arrangement of the spacing between the tanks in order to maximize the number of tanks that can be held in a load. Thus, if tanks can be spaced further apart in a horizontal direction without exceeding the maximum width, the row immediately above may be able to move downwardly into the space created between the tanks. Accordingly, for different sized tanks, for tanks having different arrangement of attachments and for different trucks it may be possible to adjust the spacing to achieve a better result. Also, it is noted that in different states and countries, the maximum widths and heights may be different so the different loading may be desirable. Accordingly, while the cantilevered arrangement shown in
Thus, while the arrangement shown in
A number of other arrangements of the connectors shown in
In
In
In
In
Numerous additional modifications and variations of the present invention are possible in light of the above teachings. It is therefore to be understood that within the scope of the appended claims, the invention may be practiced otherwise than as specifically described herein.
Claims
1. A system for holding a stacked array of articles, comprising:
- at least one flexible strap;
- said strap extending around a first of said articles and extending at least over a second of said articles;
- the strap intercepting itself at least one point and said strap being secured to itself;
- said first article being held in a cantilevered fashion from said second article by said strap.
2. The system according to claim 1, wherein said strap extends around a third article, said first through third articles forming a horizontal layer in the array.
3. The system according to claim 2, wherein said strap extends around said first through third articles.
4. The system according to claim 1, further comprising a spacer between said first article and said second article around which said strap extends.
5. The system according to claim 1, wherein said strap is secured to itself using a holder.
6. The system according to claim 5, wherein the holder is a flat plate having a slot, said slot holding the strap by friction.
7. The system according to claim 6, wherein a shim is placed behind said plate to prevent the strap from being pulled through the slot.
8. The system according to claim 7, wherein the shim is in the shape of a second plate.
9. The system according to claim 7, wherein the shim is in the shape of a round pin.
10. The system according to claim 7, wherein the shim is elongated in the direction perpendicular to the plate to form a spacer between articles.
11. The system according to claim 7, wherein the holder is a tube with an opening on one side through which the strap is inserted, with a rod being inserted in a loop of the strap within the tube.
12. The system according to claim 7, wherein the holder is a chain link through which a loop of the strap is extended, with the loop being held in place by an elongated member.
13. The system according to claim 12, wherein the elongated member is a second chain link perpendicular to the first chain link.
14. The system according to claim 1, further comprising a spacer inserted between said first article and said second article, the spacer having attached thereto a holder having a opening for receiving the strap, one end of the strap being fixed to said spacer and extending outwardly from said holder to one side to extend over said second article and extending outwardly from said holder to another side to extend around said first article.
15. The system according to claim 14, further comprising a second spacer and holder placed between said second article and a third article.
16. The system according to claim 14, wherein the holder includes a chain link and pin arrangement.
17. The system according to claim 14, wherein the holder is two chain links with one chain link being perpendicular to the other
18. The system according to claim 14, wherein the holder is a flat plate having a slot and a rod behind the said plate.
19. The system according to claim 14, wherein the holder is a tube used as a spacer and having slots formed in the surface thereof for receiving said strap and a pin.
20. The system according to claim 19, wherein the tube has a vertical orientation and the strap extends vertically through the tube.
21. The system according to claim 19, wherein the tube extends horizontally and the strap extends through the tube horizontally.
22. The system according to claim 14, wherein the holder includes a mechanical advantage.
23. The system according to claim 1, wherein said articles are horizontally extending cylinders.
24. The system according to claim 1, wherein the articles are cylindrical tanks.
25. A method for stacking plurality of articles, comprising:
- providing a flexible strap;
- extending said strap around a first of said articles and at least over a second of said articles;
- securing said strap to itself at interception points with said straps causing said articles to be held in a cantilevered arrangement.
26. The method according to claim 25, wherein the strap extends around the third article to form a horizontal arrangement of three articles with the outer articles being cantilevered from the second article.
27. The method according to claim 25, wherein the strap extends around the second article.
28. The method according to claim 25, further comprising a spacer between said first and second articles and extending around said spacer.
29. The method according to claim 25, wherein the strap is secured to itself using a holder.
30. The method according to claim 25, wherein the holder works in conjunction with the spacer between the first and second articles.
31. A system for holding a plurality of articles in a cantilevered fashion, comprising:
- at least one flexible strap;
- at least one hook provided at each end of said strap;
- each hook being attachable to an eye provided on an article, whereby said strap extends over a central article in each hook is attached to an eye on an outer article so as to provide a horizontal array of three articles with outer articles being cantilevered from the central article.
32. The system according to claim 31, further comprising spacers connected to said straps for inserting between an outer article and the center article.
33. The system according to claim 31, to whereby said strap extends diagonally between outer articles.
34. The system for holding a plurality of articles in a cantilevered fashion, comprising:
- at least one round object having a central opening being firmly connected to each article;
- a connecting device extending through openings in objects connected to adjoining articles while being overlapped, so that the connecting devices firmly hold the adjoining tanks in position.
35. The system according to claim 34, wherein the objects are metal eyes.
36. The system according to claim 34, wherein the fastening device is a nut and bolt.
37. The system according to claim 34, wherein the object is a chain link.
38. The system according to claim 34, wherein the connecting device is a chain link having an opening.
Type: Application
Filed: Aug 14, 2007
Publication Date: May 29, 2008
Inventor: Amuel E. Sheckells (Leavenworth, IN)
Application Number: 11/889,579
International Classification: B65D 63/00 (20060101);