Abstract:
A fishing sinker is comprised of a polyhedron body having a rectangular base and triangular sides with a common blunt vertex, adapted to generate a net upward lifting force during forward motion. The streamlined shape of the sinker also makes it more aerodynamic during casting and minimizes splashing during entry into water. A central channel is formed in the body for receiving an eyelet pin with a swaged end, a straight section extending through said central channel and an integrally formed eyelet portion protruding from the blunt vertex. A plurality of symmetrically arranged stabilizer fins extending along angles of intersection of each adjacent triangular side. The eyelet portion is a resilient eyelet with a slip-on opening biased into a closed position. The vertex makes the sinker quite aerodynamic, as it leads the way on casts through the air and into the water.

Description:
FIELD OF THE INVENTION  
       [0001]     This invention generally relates to fishing, and more particularly, to a finned sinker adapted to engage and disengage a fishing line without cutting the line and configured to resist snagging and to generate lift upon being reeled in.  
       BACKGROUND  
       [0002]     Many fishing sinkers known in the art may adequately cause fishing line and attached bait or a lure to sink below the water surface. However, such known prior art sinkers have several shortcomings. First, they often become snagged or hung up, particularly in fishing areas with oyster beds, rocks, brush, weed beds, stumps or debris on the bottom. As a result, many of these snag infested fishing waters are considered “off limits” with certain conventional sinkers. Additionally, many conventional sinkers are rounded, which is conducive to rolling with the current. Rolling, which is pronounced in waters with strong currents, may undesirably twist the line. Such twisting may weaken the line, break the line, impede proper casting and cause the line to unravel from a spool and result in a twisted mess known as a backlash or birds nest. Furthermore, many conventional sinkers are tied or otherwise secured to the fishing line, thus preventing the bait from moving freely. As a fish bites the bait and begins to move off with it, the resistance causes the fish to become aware of the attached line. Concomitantly, a bite is not detected until it overcomes the weight of the sinker. Another shortcoming is that tackle must be removed to thread many conventional sinkers to a line.  
         [0003]     A pyramid sinker with an eyelet protruding from a planar rectangular surface, as conceptually shown in  FIG. 6 , is popular when fishing in areas with strong currents. On soft bottoms the pyramid tends to bury itself and on hard bottoms the flat sides of the sinker will prevent it from rolling with the current. However, such sinkers do not generate lift as they are reeled in. Consequently, such sinkers tend to drag along the bottom, with the broad planar face frequently becoming snagged on weeds and debris.  
         [0004]     The invention is directed to overcoming one or more of the problems as set forth above.  
       SUMMARY OF THE INVENTION  
       [0005]     To solve one or more of the problems set forth above, in an exemplary implementation of the invention, a pyramid-like fishing sinker is provided. The sinker is comprised of a polyhedron body having a rectangular base and triangular sides with a common blunt vertex, adapted to generate a net upward lifting force during forward motion. A central channel is formed in the body for receiving an eyelet pin with a swaged end, a straight section extending through said central channel and an integrally formed eyelet portion protruding from the blunt vertex. The eyelet is free to spin, which prevents twisting of the line. A plurality of symmetrically arranged stabilizer fins extending along angles of intersection of each adjacent triangular side. The eyelet portion is a resilient eyelet with a slip-on opening biased into a closed position. The polyhedron body and plurality of fins are integrally formed and may be comprised of a material from the group consisting of lead, zinc, steel, stainless steel, babbitt, aluminum, and an alloy of lead, zinc, steel or aluminum. The sinker may be formed in various sizes and shapes to provide desired weight, stability and hydrodynamic characteristics.  
     
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
       [0006]     The foregoing and other objects, aspects and advantages will be better understood from the following detailed description of an embodiment of the invention with reference to the drawings, in which:  
         [0007]      FIG. 1  shows a side view of an exemplary sinker according to an exemplary implementation of the invention;  
         [0008]      FIG. 2  shows a bottom view of an exemplary sinker according to an exemplary implementation of the invention;  
         [0009]      FIG. 3  shows a bottom perspective view of an exemplary sinker according to an exemplary implementation of the invention;  
         [0010]      FIG. 5  shows an exemplary slip-on eyelet according to an exemplary implementation of the invention;  
         [0011]      FIG. 6  shows a side view of an exemplary sinker according to an exemplary implementation of the invention; and  
         [0012]      FIG. 6  shows a prior art pyramid sinker for illustrative purposes. 
     
    
     DETAILED DESCRIPTION  
       [0013]     As shown in  FIG. 1 , an exemplary sinker  100  according to principles of the invention is comprised of an integrally molded weighted body having a forwardly tapered pyramid-shaped body with four fins  105 - 108  projecting laterally therefrom. Fins  105 - 108  extend in a fore and aft direction for almost the entire length of the body of the sinker  100 . The fins may taper in thickness and lateral extension from the trailing edge base of the sinker to the blunt leading edge of the sinker.  
         [0014]     The sinker  100  has a bulbous (i.e., blunt), semi-spherical front leading edge  110  (as shown in  FIGS. 1 and 3 ) and a relatively flat generally rectangular finned trailing edge  140  (as shown in  FIG. 2 ). A central axis passes through the center of the leading edge  110  and the center of trailing edge  140 . A polyhedron body has a rectangular base  140  and triangular sides with the semi-spherical front leading edge as a common vertex.  
         [0015]     A central channel  102  is provided for receiving an eyelet pin  115 . An exemplary eyelet pin  115  includes an integrally formed slip-on eyelet  120 , with a slip on opening  125 , at the leading edge of the pin  115 . The trailing edge  135  of the pin may be swaged to maintain the eyelet in position. The swaged trailing edge  135  of the pin  115  may preferably be disposed within a recessed opening  130  in the trailing edge  140  of the sinker  100  to guard the swaged end from damage. In an exemplary implementation, the pin  115  is free to rotate within the channel  102 . However, because the sinker  100  is generally symmetrical it is not particularly susceptible to rotating about the pin  115 .  
         [0016]     The sinker is desirably cast of any suitable dense material having a specific gravity substantially greater than 1.0. Such materials may include metal, such as lead, zinc, babbitt, aluminum, alloys thereof, composites or the like. The sinker may be made in a variety of sizes and weights. In weights from one-half ounce up, the sinker may preferably made of a heavy metal such as lead, but in weights from one-half ounce down, the sinker may preferably made of lighter metal such as zinc or aluminum.  
         [0017]     The eyelet pin  115  may be comprised of any suitable corrosion resistant material with adequate structural integrity. Such materials may include metal, such as stainless steel, aluminum, titanium, brass, alloys thereof or the like. The eyelet pin  115  may be made in a variety of sizes to fit the sinker  100  and is configured to freely spin, thus preventing twisting of the line.  
         [0018]     The slip-on eyelet portion  120  of the eyelet pin  115  is resilient and biased into a closed position. Integrally formed straight  127  and angled  126  arm portions of the slip-on eyelet  120  facilitate manually prying open the eyelet  125  to receive or release a line, as shown in  FIG. 4 . A slip-on eyelet opening  125  is defined between the vertical neck  116  portion of the eyelet pin  115  and the free end portions  126  and  127  of the eyelet. Upon releasing the prying force, the eyelet  120  springs back to a closed (or substantially closed) position with the opening  125  being either closed or narrower than the diameter of a fishing line. Those skilled in the art will appreciate that other slip-on eyelet configurations may be utilized without departing from the scope of the invention.  
         [0019]     The fins  105 - 108  provide stability as the sinker moves through the water. The exemplary fins  105 - 108  taper from the trailing edge  140  of the sinker  100  towards the leading edge  110  of the sinker  100 . The shape of the free edge of each fin  105 - 108  may vary from a relatively blunt edge as shown in  FIGS. 2 and 3 , to a relatively sharp or rounded free edge. The length of the fins may also vary from extending in a fore and aft direction for almost the entire length of the body of the sinker  100 , to extending for a mere portion of the length of the body of the sinker  100 .  
         [0020]     Those skilled in the art will appreciate that a sinker according to the principles of the invention is not limited to the geometry shown in  FIGS. 1 through 3 . By way of example and not limitation, the angle θ, as shown in  FIG. 5 , may vary from approximately 10 to 30 degrees and the angle φ may vary from approximately 5 to 20 degrees. However, larger or smaller angles may be employed depending on the desired size and stability properties. The larger the ratio of angle θ to angle φ, the more pronounced the effect of fins  105 - 108 . The height h of the exemplary sinker may vary from approximately ½ inch to 2 inches. However, larger or smaller heights may be employed depending on the desired size and weight of the sinker.  
         [0021]     In use, the sinker is connected at its slip-on eyelet  120  to a fishing line which carries a baited hook or an artificial lure  44 . Advantageously, the streamlined shape of the sinker also makes it more aerodynamic during casting and minimizes splashing during entry into water. The blunt leading edge  110  leads the way through the air and into the water. The weight of the sinker causes the sinker to dive. As the sinker is drawn through the water, the fins  105 - 108  keep it on a straight course and counteracts any tendency for the sinker to veer to one side or the other. If the bait rotates, the fins resist rotation. Any tendency for the sinker to rotate is minimized due to the fact that the fins  105 - 108  are symmetrical. The blunt leading edge  110  and streamlined shape of the sinker reduces the tendency to snag in weeds and catch on underwater objects such as tree stumps or the like. As the sinker travels through water in direction of the leading edge  110  (i.e., blunt vertex), the leading edge becomes slightly elevated and the bottom and top triangular sides of the polyhedron body generate a net lifting force. Thus the sinker functions as a hydrofoil which produces a net lift force. The lift elevates the sinker off the floor, which reduces the tendency to snag objects on the bottom.  
         [0022]     At rest on the bottom, a sinker according to principles of the invention allows bait to move, fairly freely around on the bottom surface, while anchoring it in the one place. As a fish touches the bait and even moves off with it, the exemplary sinker allows minimal resistance on the line. Concomitantly, the geometry of the exemplary sinker resists rolling and drifting on the bottom, which tend to interfere with detection of bites. Moreover, the eyelet  120 , which may freely spin, resists undesirable twisting. Consequently, a fish is unaware of the line attached and an angler may immediately sense the bite and respond accordingly to set a hook.  
         [0023]     In an exemplary implementation, a sinker according to principles of the invention includes a slip-on eyelet  120  which obviates twisting, tying, knots and fuss to secure the sinker to the line. The slip-on eyelet allows an angler to slip the sinker on the line for free-line fishing. With the sinker sliding free on the line, it will sink to the bottom and then allow the angler to work the bait off bottom like a pulley. A fish can then take the bait without sensing resistance from the weight of the sinker. When a fish begins to bite, an angler may immediately feel the fish on the line. The sinker will rest in place quietly on the bottom while the fish pulls out as much line as allowed, without feeling the weight of the sinker.  
         [0024]     The slip-on eyelet  120  allows an angler to efficiently change sinker weights without having to cut and retie the line. When depth or structure changes, an angler may adjust the weight as desired. This makes a sinker according to principles of the invention extremely versatile and interchangeable. Additionally, an angler may slip-on additional sinkers to help release a snagged hook or lure. The additional sinkers, which may slide down to the hook or lure, provide additional weight to help release the hook or lure.  
         [0025]     Advantageously, a sinker according to principles of the invention rests on flat surface of the sinker. The geometry is not conducive to rolling and drift with bottom currents. Thus, the sinker is not susceptible to drag and drifting forces on the line for a fish to detect.  
         [0026]     A sinker according to principles of the invention may be used with other tackle. By way of example and not limitation, a pair of split shot may be added to the line as stops. The split shot may be positioned to define the distance of free movement of the sinker. This may be useful with floating bait, as the distance regulates the bait to bottom interval.  
         [0027]     Another advantage of a sinker according to principles of the invention is that it is streamlined. The vertex makes the sinker quite aerodynamic, as it leads the way on casts through the air and into the water  
         [0028]     While the invention has been described in terms of various embodiments and implementations, those skilled in the art will recognize that the invention can be practiced with modification within the spirit and scope of the appended claims. The physical embodiments described above merely exemplify the invention, which may be embodied in other specific structure within spirit and scope of the claims appended hereto.