Patent Application
20100175305
The present disclosure relates generally to devices for use in the outdoor sporting industry, and various methods associated with such devices. More particularly, this disclosure relates to fishing lures, and various methods associated with the use and manufacture of fishing lures.
Manufacturers of fishing lures strive to design lures that create a sensory enticement to fish. Fish are often times attracted to movement, such as the movement of bait fish in water. Accordingly, some conventional lures have been design to move in the water similar to the way a bait fish would naturally move. To obtain such movement through the water, lures have been designed with differently weighted regions. The manufacturing process of constructing such weighted lures involves physically attaching a weight to the lure; for example, one conventional process includes drilling a hole in the lure, inserting a lead weight into the hole, and applying an adhesive to secure the lead weight within the lure hole. This process is time consuming and can often result in undesirable variances among the individual lures (such as weight variances or weight distribution/center of gravity variances). In general, conventional fishing lures and methods of manufacturing fishing lures can be improved.
One aspect of the present disclosure relates to a fishing lure having a lure body made of at least two portions of different materials. One of the materials has a density that is at least 1.5 times greater than the other material. In one embodiment, the desired density for each portion of the body can be attained by including materials that can reduce the density of one portion while materials that increase density can be added to the other portion The lure body is manufactured in a molding process that permits the manufacturer to selectively locate the lure's center of gravity to achieve a desired motion or orientation in water. The body of the invention can be made by thermal molding techniques or by mechanical assembly techniques.
A variety of examples of desirable product features or methods are set forth in part in the description that follows, and in part will be apparent from the description, or may be learned by practicing various aspects of the disclosure. The aspects of the disclosure may relate to individual features as well as combinations of features, including combinations of features disclosed in separate embodiments. It is to be understood that both the foregoing general description and the following detailed description are explanatory only, and are not restrictive of the claimed invention.
Reference will now be made in detail to exemplary aspects of the present disclosure that are illustrated in the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.
Referring still to
The solid lure body 12 is constructed of a first selected material 24 that defines the first body portion 14 and a second selected material 26 that defines the second body portion 16. The second material 26 is different than the first material 24. In the illustrated embodiment, the lure body 12 includes only the first and second body portions 14, 16, and is accordingly made of only the first and second materials 24, 26.
In alternative embodiments, the solid lure body 12 may include more than two formed body portions, each body portion being defined by materials different than the other body portions. A third body portion, for example, can be used to provide a center of mass that creates movement in the water in a direction different than the direction of movement created by the other body portions.
Referring back to the embodiment of
The first material 24 of the first body portion 14 can have reduced density using a number of density reducing techniques. The first material can be made of foamed materials. A formed body can be machined to remove material to a final desired density. One useful technique is to include reduced density materials in the body. Such reduced density materials can include, for example, hollow glass spheres. Hollow glass spheres are widely used in industry as additives to polymeric compounds, e.g., as modifiers, enhancers, rigidifiers and fillers. These spheres are strong enough to avoid being crushed or broken during further processing of the polymeric compound, such as by high pressure spraying, kneading, extrusion or injection molding. Proper distribution of the glass spheres is completed by maintaining appropriate viscosity of the polymer/glass sphere formulation. Furthermore, it is desirable that these spheres be resistant to leaching or other chemical interaction with their associated polymeric compound. The method of expanding solid glass particles into hollow glass spheres by heating is well known. See, e.g., U.S. Pat. No. 3,365,315. Glass is ground to particulate form and then heated to cause the particles to become plastic and for gaseous material within the glass to act as a blowing agent to cause the particles to expand. During heating and expansion, the particles are maintained in a suspended state either by directing gas currents under them or allowing them to fall freely through a heating zone. Sulfur, or compounds of oxygen and sulfur, serves as the principal blowing agent. A number of factors affect the density, size, strength, chemical durability and yield (the percentage by weight or volume of heated particles that become hollow) of hollow glass spheres. These factors include the chemical composition of the glass; the sizes of the particles fed into the furnace; the temperature and duration of heating the particles; and the chemical atmosphere (e.g., oxidizing or reducing) to which the particles are exposed during heating.
There have been problems in attempting to improve the quality and yield of hollow glass spheres. One reason is that it was believed that the percentage of silica (SiO2) in glass used to form hollow glass spheres should be between 65 and 85 percent by weight and that a weight percentage of SiO.sub.2 below 60 to 65 percent would drastically reduce the yield of the hollow spheres.
In use in the manufacture of the present fishing lure 10, the hollow glass spheres have average densities of about 0.1 grams-cm−3 to approximately 0.6 grams-cm−3 or about 0.12 grams-cm−3 to approximately 0.4 grams-cm−3 and are prepared by heating solid glass particles. For a product of hollow glass spheres having a particular desired average density, there is an optimum sphere range of sizes of particles making up that product which produces the maximum average strength. One such sphere range of size is between 10 μm and 125 μm.
Hollow glass spheres used commercially can include both solid and hollow glass spheres. All the particles heated in the furnace do not expand, and most hollow glass-sphere products are sold without separating the hollow from the solid spheres.
The second material 26 of the second body portion 16 can include materials that can increase density for example, lead, tin, bismuth, stainless steel, and tungsten. Other materials and manufacturing techniques associated with molding such materials that can be used and employed to manufacture the different body portions of the disclosed fishing lure 10 are described in U.S. Patent Application Nos. 60/022,016 and 10/988,214; which applications are incorporated herein by reference. Foaming agents can further be incorporated into the selected materials to obtain body portions having a particular specific gravity or density. Additionally, a relatively large void space may be created at the interface to create unique swimming action.
In one embodiment, the second material 26 of the fishing lure 10 has a specific gravity or density that is at least 1.5 times greater than that of the first material 24. In another embodiment, the second material 26 of the fishing lure 10 has a specific gravity or density that is at least 2 times greater than that of the first material 24. In the illustrated embodiment of
The spherical lure body 12 of
The present fishing lure 10 accordingly has a variable density lure body 12 (e.g., a dual density lure body). Conventional lead jigs, for example, do not have variable densities within the jig's given shape or body. Likewise, plastic crank baits, metal spoons, and artificial wood minnows do not have solid bodies with variable densities.
Still referring to
In general, the fishing lure 10 has a weight and a volume. A majority of the weight of the fishing lure 10 is defined by the combined weight of the first and second body portions 14, 16 of the lure body 12. Further, in the illustrated embodiment, a majority of the weight of the fishing lure 10 is defined by the weight of the second body portion 16 of the lure body 12. A majority of the volume of the fishing lure 10 is defined by the first and second body portions 14, 16 of the lure body 12.
The present fishing lure 10 also has a density. The density of the fishing lure 10 remains constant during use of the lure 10. That is, the fishing lure does not have a body that fills with water or absorbs water so as to change the density of the fishing lure, and does not otherwise have an adjustable density. The density is instead selected and predetermined at the time of manufacturing in correspondence with the selected first and second materials 24, 26 of the lure body 12, as described above.
With that, the present disclosure further relates to a method of manufacturing a fishing lure. The method includes placing materials having desired specific gravities in strategic locations within a fishing lure mold to obtain unique lure motion (including sink rate, movement, and orientation in water when fishing). In one method, melt molding technology is used to create a composite lure body with segments or regions of lower and higher density materials, as previously described. The lower and higher density materials have different buoyant forces and are utilized to obtain a wide range of lure motions depending on the density distribution within the lure body. For example, the lure can be weighted heavily to the front with high buoyancy in the rear, weighted heavily to the back with high buoyancy in the front, or weighted heavily to the bottom with high buoyancy at the top, and etc.
Referring now to
In one method of manufacture, a predetermined amount of one of the first and second materials 24, 26 is deposited (e.g., injected or introduced) into the mold cavity. The deposited material is permitted to harden, the mold 34 opened, and the hardened deposits removed. An unwanted portion of the hardened deposit is then removed (e.g., cut away or trimmed) and the modified hardened deposits returned to mold cavities. The other of the first and second materials 24, 26 is then deposited into the mold cavity wherein the two materials fuse to one another to form the lure body 12.
In another method of manufacture, a divider is positioned within the mold cavity to divide the mold cavity into two regions. A predetermined amount of one of the first and second materials 24, 26 is deposited into one of the two regions. The deposited material is permitted to harden, the mold 34 opened, and the divider removed. The other of the first and second materials 24, 26 is then deposited into the mold cavity wherein the two materials fuse together to form the lure body 12. In a similar fashion, two molds can be utilized; the first mold provides an appropriate fill area for only the first material. The molded first material is then removed from the first mold and placed into the second mold. The second material is then injected into the second mold to complete the overall shape of the lure. Mechanical interlocks can be designed using this method whereby the second material upon cooling becomes hard and inseparable from the other(s).
In still another method of manufacture, a predetermined amount of one of the first and second materials 24, 26 is deposited into the mold cavity. The deposited material may be permitted to slightly harden. A predetermined amount of the other one of the first and second materials 24, 26 is deposited into the mold cavity. The first and second materials fuse together to form the lure body 12.
Further details of manufacturing techniques that can be used in accordance with the present disclosure are described in U.S. Patent Application No. 60/022,016; which application is previously incorporated herein by reference.
As shown in
After the formation of the lure body 12 (with or without inserts), the lure body 12 may undergo further processing whereby an outer layer 38 is applied to the lure body 12 (the outer layer 38 shown partially and schematically in
One aspect of the present method of manufacturing the fishing lure 10 is the ability to more precisely and more accurately manufacture a number of fishing lures each of which effects the same desired motion and orientation in the water. For example, during the deposit of the denser second material 26, the material is placed at a predetermined location within the cavity such that the resulting lure body 12 has a center of mass that creates the desired motion and orientation in the water. The amounts and locations of the materials 24, 26 of the resulting lure body 12 can be selected and controlled, the present molding process thereby eliminating variances associated with conventional lure assembly processes.
In another aspect, the presently disclosed method permits the manufacturer to create a wide range of lure designs. That is, the present variable density molding method allows manufacturers to adapt designs by selecting the strategic locations at which to create a center of gravity, and by allowing manufacturers to utilize a wide variety of materials with different densities. This, in combination with the ability of create unique shapes by way of molding, offers manufacturers greater flexibility and freedom in the creation of lure designs.
In general, the present method of fusing high and low density materials in one mold provides a cost effective and efficient way of obtaining variable density lure bodies, and further allows manufacturers to strategically select and place centers of gravity in a given lure body shape, with greater accuracy. As can be understood, the present method also increases production rates for manufacturers of lures with the above described features. In addition, polymeric thermoplastic materials have physical properties that are different than conventional lure materials, such as lead, especially in flexural modules or stiffness. The utilization of polymeric thermoplastic materials, for example, in the manufacture of a lure allows for the provision of shapes (fins and other projections) that aren't possible with such conventional materials.
Referring now to
The first and second material 124, 126 of the fishing lure 100 can include the same materials with the densities and density differentials as previously described. In this particular embodiment, the solid lure body 1a2 has an elongated bait-fish shape. What is meant by “bait-fish” shape is that the lure body 112 is shaped like a small fish used as bait to attract predatory fish, particularly game fish. Examples of marine bait fish include anchovies, halfbeaks, and scad. Freshwater bait fish include any fish of the minnow or carp family (Cyprinidae), sucker family (Catostomidae), top minnows or killifish family (Cyprinodontidae), shad family (Clupeidae), sculpin family (Osteichthyes), or sunfish family (Centrarchidae). Other bait-fish shaped bodies resembling different species of bait fish can be used.
In the illustrated embodiment, the second body portion 116 having the greater specific gravity defines a leading lure portion of the bait-fish lure body 112; the first body portion 114 defines a trailing lure portion. The leading lure portion (i.e., 116) has a sink rate greater than that of the trailing lure portion (i.e., 114) to produce a particular motion and orientation in water. In particular, the fishing lure 100 has a forward diving motion and orientation in water.
Still referring to
Similar to the previous embodiment, the fishing lure 100 has a weight and a volume. A majority of the weight of the fishing lure 100 is defined by the combined weight of the first and second body portions 114, 116 of the lure body 112. In addition, a majority of the volume of the fishing lure 100 is defined by the first and second body portions 114, 116 of the lure body 112.
The present fishing lure 100 also has a density. The density of the fishing lure 100 remains constant during use of the lure 100. That is, the fishing lure does not have a body that fills with water or absorbs water so as to change the density of the fishing lure, and does not otherwise have an adjustable density. The density is instead selected and predetermined at the time of manufacturing in correspondence with the selected first and second materials 124, 126 of the lure body 112, as described above.
With that, the present fishing lure 100 can be manufactured by the molding processes previously described wherein predetermined amounts of the first and second materials 124, 126 are deposited into a mold cavity. The predetermined amounts are strategically located within the mold cavity such that the lure's center of gravity effects the desired motion in water.
The present lure bodies described herein are directed toward solid lure bodies. It is contemplated that hollow body that may include, for example, an internal rattle, can be manufactured in accordance with the principles disclosed.
The above specification provides a complete description of the present invention. Since many embodiments of the invention can be made without departing from the spirit and scope of the invention, certain aspects of the invention reside in the claims hereinafter appended.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 61/140,680, filed Dec. 24, 2008, which application is hereby incorporated by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| 61140680 | Dec 2008 | US |
