Abstract:
A carrier for a scuba tank or other cylindrical bottle comprises two cylindrical handles connected by a looped rope, the rope passing slidably through one of the handles. The scuba tank is supported by the ropes and carried by one handle looped through the rope. The handles may also be used to chock the tank against rolling in a vehicle, by placing the tank next to one handle and sliding the other handle up against the tank.

Description:
BACKGROUND OF INVENTION 
   This invention is in the field of article carriers and supports, more specifically in the field of carriers and supports for compressed gas bottles, and more specifically still in the field of hand carriers for scuba tanks. The invention also pertains to the secure transport of compressed gas bottles in vehicles, and more specifically to the transport of scuba tanks to and from dive sites by vehicle and by hand. Although this invention can be used on a variety of cylinders, for simplicity the terms “scuba tank” or “tank” will generally be used herein to represent the item being carried by the invention. 
   Because they are generally comprised of thick-walled metal, compressed gas bottles are relatively heavy objects to carry by hand. Only small ones such as scuba tanks can be carried by hand at all without some kind of aid to hand carriage, and even then not comfortably and not for long distances. Their shape, generally cylindrical, flat or dished at one end and rounded with an axially-installed valve at the other, makes them ungainly; many users handle them by the valve or regulator. This is not recommended, because these parts are not shaped for secure grasp and allow some chance for dropping the bottle. If the bottle is dropped, personal injury or damage to the bottle can occur; in the worst case, catastrophic failure of the valve stem could occur with explosive release of the compressed gas. It is also possible to open the valve slightly while handling a gas bottle by its valve or regulator. 
   These contingencies have led to the creation of a number of carrying devices for gas bottles. Two examples: U.S. Pat. No. 5,511,846 to Fuller teaches a pouch with two handles; and U.S. Pat. No. 4,804,218 to Hilliard teaches circumferential straps with flexible handles. The drawback to these devices is that the handles are not adjustable and they do not prevent the bottle from rolling around in a vehicle. 
   Anti-roll features are taught by U.S. Pat. No. 4,754,996 to Tecca, et al., and U.S. Pat. No. 5,549,339 to Frean, which describe flat bases affixed to a gas bottle along with straps. These devices have more parts and structure than the present invention. 
   An invention bearing some similarities in appearance to the present invention is described in Australian patent no. 81462/91 to Russell. It discloses parallel rigid tubes affixed to a rope, but the tubes serve as a support for a scuba tank and not as handles. 
   SUMMARY OF INVENTION 
   The present invention comprises a rope and two rigid elongate handles, the rope being fixed to one end of the first handle, threaded through first one end and then the other end of the second handle, and finally fixed to the other end of the first handle. The rope thereby forms a loop with two sides of the rope loop running through the second handle. This allows the second handle to be slid along the two sides of the rope to increase or decrease the distance between the handles. To use the device to carry a scuba tank, the rope and handles are first laid on a flat surface to form a rectangle with the handles being the right and left sides of the rectangle and the two sides of the rope loop being the top and bottom. The scuba tank is placed on the rope (parallel to the handles) and the handles are lifted and brought together, causing the two sides of the rope to encircle the tank. The second handle is then inserted between the two sides of the rope coming from the first handle (or vice versa) and lifted to bring the scuba tank off the surface. 
   The tank can be transported in a vehicle with reduced potential for rolling around in the vehicle by lowering the tank (held by the invention) into a flat space in a vehicle (such as a trunk), separating the handles, and laying them out on either side of the tank. The fixed handle is placed against the tank, and the slidable handle is drawn up against the tank by pulling the rope outward from the tank through the holes in that handle. Frictional engagement between the handles and the tank prevents rolling of the tank on the surface. Another embodiment of the invention provides a portion of each handle with at least one flat side so as to further inhibit rolling. 
   The handles are coated with resilient friction-enhancing material to provide a more comfortable grip while it is carried and to engage the wall of the tank to inhibit roll when it is supported by a flat surface. 
   It is an object of this invention to provide a simple and inexpensive method for safely hand-carrying a scuba tank or other gas bottle with one hand. Another object of the invention is to provide means to prevent such tank from rolling on a flat surface, such as within a moving vehicle. 

   
     BRIEF DESCRIPTION OF DRAWINGS 
       FIG. 1  is a perspective view of the first, preferred, embodiment of the invention before a scuba tank is placed in it. 
       FIG. 2  is a perspective view of a second embodiment. 
       FIG. 3  is a perspective view of the preferred embodiment carrying a scuba tank. 
       FIG. 4  is a perspective view of the preferred embodiment being adjusted to prevent rolling of a scuba tank on a flat surface. 
       FIG. 5  is an end view of the preferred embodiment and a scuba tank on a flat surface. 
       FIG. 6  is a perspective view of a third embodiment of the invention. 
       FIG. 7  is an end view of the third embodiment. 
   

   DETAILED DESCRIPTION 
   Referring now to the drawings, in which like features have been given the same reference numbers in each of the figures,  FIG. 1  is a perspective view of a first, preferred, embodiment of the invention before a scuba tank is placed in it. It consists of two hollow cylindrical handles, a fixed handle  1  and a sliding handle  2 , joined together by a rope  3 . The rope  3  has a first end  4 , secured within a first hole  5  drilled through one side  6  of near end  7  of fixed handle  1 , and a second end  8  secured within a second hole  9  drilled through the same side  6  of far end  10  of fixed handle  1 . The sliding handle  2  slides freely along rope  3  because rope  3  is inserted through a third hole  11  through near end  12  of sliding handle  2 , and again through a fourth hole  13  through far end  14  of sliding handle  2 . Rope  3  is thus divided roughly into a near portion  15 , a far portion  16 , and a median portion  17 . It is apparent that by grasping its median portion  17 , rope  3  can be pulled rightward until the rope is straight between the two handles. Likewise, near portion  15  and far portion  16  can be pulled leftward until median portion  17  rests against handle  2 . 
   Handles  1  and  2  are further equipped with resilient grips  18  and  19 , respectively, located in middle of each handle, and near and far end caps  20 ,  21 ,  22 , and  23 , respectively, ensconced upon the ends of the handles to protect the handles and objects that may come into contact with the handles. An adequate means of securing the rope ends  4  and  8  within the first and second holes  5  and  9  of the first handle  1  is to tie knots (not shown) in the rope ends before end caps  20  and  21  are put on. 
     FIG. 2 , a second embodiment of the invention, involves dividing median portion  17  of rope  3  into separate ropes  24  and  25  and tying off the new ends  26  and  27  or providing other means for preventing the new ends from being pulled out of third hole  11  or fourth hole  13 . It is useful to note that claims  10  through  18  of the present specification are directed towards this second embodiment. 
     FIG. 3  is a perspective view of the first embodiment carrying a scuba tank  201 . The tank  201  is shown with a typical bottom cap  202  and valve stem  203 , which are not part of the invention. To carry the tank, the near portion  15  and the far portion  16  of the rope  3  are wrapped around the tank  201 , and sliding handle  2  is inserted between the near and far portions  15  and  16 . When sliding handle  2  is pulled upward by the hand of a user, represented by arrow A, grasping sliding resilient grip  19 , sliding handle  2  slides upward on rope  3  until it is stopped by the median portion  17  of the rope  3 . Farther upward motion by the user lifts everything. 
   It is evident that the invention will function equally well if fixed handle  1  instead of sliding handle  2  is inserted between the near and far rope portions  15  and  16 , while still lifting sliding handle  2 . This would place rope bights  204  and  205  outside of rope portions  15  and  16 , respectively, instead of inside as shown. It is also evident that the invention will function if the positions of fixed handle  1  and sliding handle  2  are swapped in the above combinations. 
     FIG. 4  is a perspective view of the invention being adjusted to prevent rolling of tank  201  on a flat surface. Fixed handle  1  is first placed alongside tank  201 , so that fixed handle resilient grip  18  or end caps  20  and  21  are in contact with tank  201 . Sliding handle  2  is then secured against the opposite side of tank  201  by holding sliding handle resilient grip  19  against the tank and pulling as much of rope  3  rightward as possible. If the tank is urged to roll rightward (for example) by motion of the surface, resilient grip  19  will try to roll leftward, thus inhibiting rolling. Twisting of the rope  3  within through holes  11  and  13  will further inhibit rolling. Leftward roll in this view is prevented by fixed handle  1  being held by rope ends  4  and  8 , as well as by the opposing roll tendency of fixed handle  1  against tank  201 . The diameters of end caps  20 ,  21 ,  22  and  23  are shown here being equal to that of grips  18  and  19 , as that maximizes contact between the tank, the handles, and the surface, but it is not necessary. 
     FIG. 5  is a near end view of the invention and a scuba tank  201  on a flat surface  401 , more clearly showing that tank rotation B reacts against surface  401  oppositely to rotation C of handle  2 . It is evident as well that twisting of rope  3  within through hole  11  by significant rotation of handle  2  will interfere with rolling. 
     FIG. 6  is a perspective view of a third embodiment of the invention. In this embodiment, angular blocks  501 ,  502 ,  503 , and  504  replace end caps  20 – 23  in the earlier drawings. the flat sides of the angular blocks provide an added measure of roll prevention if desired. 
     FIG. 7  is an end view of the third embodiment showing tank  201  chocked by angular blocks  501  and  503 .