Bob for cast fishing
The present invention pertains to an improved cast fishing implement comprising a line, a leader or snell, a hook device (e.g., a hook with bait, a spinner or the like), a sinker attached to the line, and a bob consisting of a float body with a weight at the forward end thereof (e.g., a lead ring) and provided with a central cavity which is outwardly open at one end and which at the other end terminates in an elongated channel formed in a straight, rod-shaped extension of the rearward end of the float body, the dimensions of said cavity being adapted to contain the hook with bait, the spinner or the like, and the shape and dimensions of said channel being adapted to contain the sinker. 
     Such a fishing implement is disclosed in U.S. Pat. No. 3,292,296. In this patent specification, the implement comprises an arrow to be shot forth from a bow. The disadvantage of the patented implement is that the float gives no indication as to whether the hook and sinker have left the float or not. The bob or float will in all circumstances lie flat on the water and one is thus unable to ascertain if the implement is in a position to fish or not. 
     Norwegian Pat. No. 92.319 discloses a casting bob having a cavity which holds the hook device and sinker during the cast. This float will in all circumstances stand upright in the water, whether the hook and sinker have left the float or not. The same is true of a device shown in German Pat. No. 848.584. 
     The purpose of the present invention is to improve upon the previously known floats of this type. This is obtained by an improved fishing implement of the type specified introductorily, which is characterized in that the float is balanced such that its center of gravity lies near the forward end of the bob, permitting it to stand upright on the surface of the water when the hook, spinner or the like and the sinker have left the float, and in that the overall length of the hook, leader and sinker is adapted to conform to the overall length of the float cavity and the channel in the extension thereof. 
     When fishing, the float is used as follows: The hook with bait or a spinner and the sinker are pulled back into the bob, the length of the snell or leader being adapted such that the sinker will be positioned at the back of the channel in the float extension and the hook will lie within the float cavity. The bob is then cast by means of a casting implement, e.g., a casting rod, or simply thrown out by hand, the rest of the line being wound onto a simple casting reel held in the fisherman&#39;s other hand. When the bob reaches the surface of the water, the hook, bait and sinker will be pushed out of the cavity in the float and begin to sink. The correct depth of the line for fishing is set in the normal way be placing a knot or bead on the line at a suitable distance from the float. The hook or spinner will then sink down to the depth determined by the bead or knot, which checks the further passage of the line through the small hole in the end wall of the extension. The float will bob up into an upright position in the water owing to the location of its center of gravity. If the hook and sinker for some reason fail to leave the float, however, the bob will not stand upright, because the weight of the sinker at the back of the extension will cause the float to lie flat on the water, thus providing a clear indication to the angler that the fishing implement is inoperative. One can then try to dislodge the hook and sinker from the float by a quick jerk of the line. If this fails to raise the bob, the float will have to be reeled in and the error corrected. 
     One embodiment of the invention is characterized in that the float body is made of plastic foam and that the extension comprises a tubular member which is molded into the float body. 
     A second practical embodiment is characterized in that the float body and extension are molded as one piece, preferably of hard plastic foam. 
    
    
     The invention will be further elucidated in the following with reference to the accompanying drawings. 
     FIG. 1 shows an embodiment of a bob according to the invention, seen in cross section. 
     FIG. 2 shows the bob as it is being cast. 
     FIG. 3 shows the bob just after it has arrived at the surface of the water, and 
     FIG. 4 shows the bob as it is being reeled in. 
     FIG. 5 shows a second embodiment of the bob according to the invention. 
    
    
     The casting bob consists of a float body 1, e.g., molded of polyurethane foam and having a sealed outer membrane 2. The float is a rotational body, and concentric with its axis a. there is a central cavity 3 which is open out toward the forward end 4 of the bob. At the opposite end of the bob is a narrow extension 5 which is also concentric about the axis a. The extension 5 is hollow, such that the central cavity 3 continues backwards into the channel 6 inside the extension 5. The channel 6 is closed at the back by means of an end wall 7 which has a small central opening 8 for the fishing line 9. As can be seen on the drawing, the channel 6 has a smaller cross section than the central cavity 3, and the two chambers are connected via a conical transition section 10. The extension 5, the transition section 10 and the walls of the central cavity 3 can be molded as one unit, preferably from a tough type of plastic. A ring 11 of metal, preferably lead, is attached to the forward edge of the bob to weight it in this area. 
     The line 9, as mentioned above, passes through the hole 8 in the end wall into the channel 6. Attached to the line is a sinker 12 which is connected to a hook 13 via a leader or snell 14. The length of the leader is adapted such that when the sinker 12 is drawn into the channel and abuts against the end wall 7, the hook will lie approximately in the middle of the central cavity 3. During use, bait 15 is attached to the hook. To set the line at a suitable fishing depth, a barrier, e.g., a knot 16, is placed in the line above the bob. The hook with the bait and sinker will then sink down through the water until the knot 16 reaches the end wall 7 and checks further descent, the knot being made so large that it cannot pass through the hole 8. 
     FIG. 2 shows the orientation of the bob as it is being cast through the air. 
     On FIG. 3, the bob has just arrived at the surface of the water 17. The sinker 12, hook 13 and bait 15 have left the bob and pull the line 9 through the float until the knot 16 checks any further descent. 
     FIG. 4 shows the bob as the line is being reeled in, with the sinker 12, hook 13 and bait 15 once again drawn up into the cavity inside the float. As one will note, the bob has a fairly horizontal orientation. It will remain in this position even if the line is slackened, because the sinker 12 counterbalances the weight of the lead ring 11. This design provides several advantages. Firstly, the bob clearly indicates if the sinker and hook have left the float, as it will then rise into a vertical position. In addition, it is an advantage when the line is being reeled in that the bob has a fairly horizontal orientation on the water, because the sinker, hook and bait will not then leave the bob unless the line is powerfully jerked. This would of course cause the bob to rise, and the sinker, hook and bait would once again leave the float. Normally, however, one can free the line of jellyfisk, sea grass, oil pollutants and the like as the line is being reeled in without risking that the bob will rise up and release the sinker and hook, which might in that case become snagged on the bottom if the bob has been brought into shallow waters as the line is reeled in. 
     FIG. 5 shows a second embodiment of the bob, where the float 1 and extension 5 have been molded as one piece. The bob can be made of hard plastic foam with a sealed outer surface 2 and a sealed inner surface 18 in the central cavity 3 and channel 6. The end of the extension 5 can be provided with external, molded stabilizer fins 19, as known per se, to increase control of the bob during casting (FIG. 2). 
     Practical experiments have shown that the bob of the invention can be cast up to one-third farther than previously known bobs, using the same casting equipment. 
     The invention should not be construed as being restricted to the embodiments as described above and illustrated in the drawings, as it could have a number of different outer configurations which would nevertheless remain within the scope of the present invention.