US20060005451A1

US20060005451A1 - Mechanical netting device

Info

Publication number: US20060005451A1
Application number: US10/890,618
Authority: US
Inventors: David Norman
Original assignee: Individual
Current assignee: Individual
Priority date: 2004-07-12
Filing date: 2004-07-12
Publication date: 2006-01-12
Also published as: WO2006017287A1; US20060156610A1; US7325356B2

Abstract

Some embodiments of the invention include a net assembly and a lifting mechanism, where the lifting mechanism, when activated, moves the net assembly from a first position beneath the water surface to a second position that is higher than the first position. These embodiments allow anglers and other individuals engaged in sport-fishing to easily net a fish while retaining the use of both hands for other purposes. Other embodiments are described and claimed.

Description

BACKGROUND OF THE INVENTION

1. Technical Field of the Invention
This disclosure relates in general to equipment used to capture and restrain objects found in the water, and in particular, to a mechanical netting device for the capture and restraint of objects found in the water.
2. Description of the Related Art
Many individuals must capture and/or restrain objects found in the water for work and/or play. Sport-fishing from a boat is one example. As opposed to commercial fishing practices that typically use very large nets or long lines to capture many fish at once, sport-fishing refers to an angler who seeks to capture and/or kill an individual fish for primarily recreational purposes.
When sport-fishing from a boat, the process of bringing a fish into the boat, or “landing” a fish, has traditionally been accomplished using three primary methods, each of which may be performed either by the angler who is playing the fish or by a companion of the angler.
The first traditional method is to physically grab the fish, either by the tail or by the mouth, using the hand or some type of pliers, and lift it inside the boat. If done by hand, this technique works well only for small fish that lack sharp teeth. If done by the angler, it requires the angler to grasp the fishing rod with one hand while using the other to handle the fish. Furthermore, fish are often played to complete exhaustion before the angler or the angler's companion attempts to land the fish, which decreases the chances of fish survival if the fish must be released for reasons such as being too small, too large, wrong species, etc. Fish that are allowed to be killed under the applicable fishing regulations are often referred to as “legal.”
The second traditional method is to gaff the fish. The hook of the gaff is used to pierce the fish and lift it into the boat. If done by the angler, it requires the angler to grasp the fishing rod with one hand while using the other to handle the gaff. Obviously, gaffing should be employed only with legal fish. Ascertaining whether a fish is legal must be accomplished before the fish is gaffed, and this is sometimes difficult, especially when closely related species of fish are present in the water, e.g., there may be up to five species of salmon present in the waters off Alaska.
The third traditional method, and by far the most popular, is to net the fish using a long-handled net when the fish is close to the boat. If done by the angler, it requires the angler to grasp the fishing rod with one hand while using the other to handle the net.
In addition to the disadvantages described above, the traditional methods are becoming more inconvenient in the face of increasingly popular catch-and-release regulations that are designed to be protective of the fish. Catch-and-release regulations govern the handling of fish that are caught purely for sport, with the intent that the fish will be released back to the water.
Fish are harmed by the traditional methods of landing them in numerous ways. For example, it has been shown that lifting fish, especially larger ones, from the buoyancy provided by the water can be traumatic to the fish's internal organs. It has been shown that traditional fish net made of nylon filaments or hemp filaments can be damaging to fins and gills. It has been shown that handling fish with dry hands can damage the fish's protective slime coating, which is a barrier to infection.
In order to minimize harm to fish, some catch-and-release regulations require that the fish be played and released without ever leaving the water. For anglers who use the traditional methods of landing fish described above, this poses increased difficulty. For example, gaffing a fish is entirely incompatible with catch-and-release regulations. Grabbing a fish is still possible, but now the fish must remain in the water while the angler attempts to release the hook. Netting the fish is probably easiest, but the angler must first net the fish, put down the rod, and release the fish, all while maintaining a grip on the net.
Embodiments of the invention address these and other disadvantages of the traditional methods described above as well as other methods not described.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating an exemplary lifting mechanism for a mechanical netting device according to some embodiments of the invention.
FIG. 2 is a perspective diagram illustrating an exemplary net assembly for a mechanical netting device according to some embodiments of the invention.
FIG. 3 is a cross-sectional diagram illustrating the operational configuration of a mechanical netting device that includes the lifting mechanism of FIG. 1 and the net assembly of FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

FIG. 1 is a diagram illustrating an exemplary lifting mechanism 100 for a mechanical netting device according to some embodiments of the invention.
Referring to FIG. 1, the lifting mechanism 100 includes a portable air tank 110, a valve 120, pneumatic tubing 130, and a pneumatic cylinder 140 that includes a cylinder rod 145.
The pneumatic cylinder 140 is operated by compressed air stored in the portable air tank 110. The compressed air stored in the portable air tank 110 is selectively supplied, using the pneumatic tubing 130, to either end of the pneumatic cylinder 140 by the valve 120. As illustrated in FIG. 1A, when compressed air is supplied to one end of the pneumatic cylinder 140, the cylinder rod 145 is extended from the pneumatic cylinder. When compressed air is supplied to the other end of the pneumatic cylinder 140, the cylinder rod 145 reverts to its retracted position within the pneumatic cylinder. Because the cylinder rod 145 may be moved both outward and inward by the compressed air, the pneumatic cylinder 140 is categorized as a double-action pneumatic cylinder.
In alternative embodiments of the invention, the pneumatic cylinder 140 may be a single-action pneumatic cylinder, which can be moved pneumatically in only one direction. In single-action pneumatic cylinders, the return movement of the cylinder rod may be supplied by a spring or some other force when the air pressure is removed.
The lifting capacity of the pneumatic cylinder depends upon the size of the barrel and the air pressure used to operate it. A variety of pneumatic cylinders having different lifting capacities and stroke lengths may be obtained from numerous pneumatic cylinder manufacturers. An exemplary pneumatic cylinder that is suitable for use with some embodiments of the invention is manufactured by Schrader Bellows as Model FW 2B110521. This particular pneumatic cylinder model possesses a 48 inch stroke.
Although the lifting mechanism 100 illustrated in FIG. 1 relies upon compressed air to operate, other embodiments of the invention may utilize hydraulic or even electric lifting mechanisms, such as an electric linear actuator. However, electric lifting mechanisms are not preferred because of the wet operating environment. For example, additional waterproofing may be required for the electric circuits of these embodiments.
According to preferred embodiments of the invention, the valve 120 illustrated in FIG. 1 may be foot-operated. In other words, an angler standing in a boat with both hands otherwise occupied may use a foot to move the valve 120 to a position that causes the cylinder rod 145 to extend from the pneumatic cylinder 140. The pneumatic tubing 130 illustrated in FIG. 1 does not necessarily represent the actual length of the pneumatic tubing 130 used in embodiments of the invention. Preferably, the length of the pneumatic tubing 130 is long enough to allow the valve 120 and the portable air tank 110 to be positioned on the floor of the boat while the pneumatic cylinder 140 is positioned outside of the boat.
FIG. 2 is a perspective diagram illustrating an exemplary net assembly 200 for a mechanical netting device according to some embodiments of the invention.
Referring to FIG. 2, the net assembly 200 includes a net 210, a net support 220, and a net attachment 230. The net support 220 defines the shape and size of the opening for the net 210. Although the shape of the illustrated net support 220 is rectangular, alternative embodiments of the invention may use other shapes, such as circular shapes, oval shapes, square shapes, etc. The actual size of the illustrated net support 220, as well as the size and depth of the net 210, will depend to a large extent upon the expected size of the fish that are to be caught. The net attachment 230 is structured to connect the net support 220 to the exposed end of the cylinder rod 145 shown in FIG. 1.
FIG. 3 is a cross-sectional diagram illustrating the operational configuration of a mechanical netting device 300 that includes the lifting mechanism of FIG. 1 and the net assembly of FIG. 2. For ease of illustration, only the pneumatic cylinder 140 and the cylinder rod 145 of the lifting mechanism 100 are shown in FIG. 3.
As shown in FIG. 3, the netting device 300 also includes a boat attachment 320. Preferably, the boat attachment 320 is a clamp that allows the netting device 300 to be positioned in any suitable location on the gunwale 310 of the boat. The boat attachment 320 may also be permanently affixed to the gunwale 310, but detachably affixed to the pneumatic cylinder 140. Either option would allow the netting device 300 to be removed from the boat during transit between fishing areas, docking of the boat, etc.
As illustrated in FIG. 3, the net attachment 230 connects the net assembly 200 to the exposed end of the cylinder rod 145. In preferred embodiments of the invention, the net attachment 230 and the cylinder rod 145 are detachably affixed to each other. Furthermore, the net attachment 230 may also be detachably affixed to the net support 220, and the net 210 is preferably detachably affixed to the net support 220. That is, the cylinder rod 145, the net attachment 230, the net support 220, and the net 210 may be easily connected and disconnected to facilitate transport of the netting device 300.
An exemplary operational configuration of the netting device 300 is illustrated in FIG. 3. When the cylinder rod 145 is in the retracted position within the pneumatic cylinder 140, the net support 220 and the top of the net 210 is positioned at some distance below the waterline. Preferably, this distance is large enough to allow the angler to easily guide a hooked fish over the net, but small enough so that the chances of the fish swimming the line around the net support 220 or the net attachment 230 and breaking off is minimized.
Operation of the netting device 300 will now be described with reference to FIGS. 1, 2, and 3. Once the netting device 300 is assembled as shown in FIG. 3, a hooked fish may be led over the rectangular opening of the net support 220. After the fish is in position, the angler or another person may operate the valve 120 so that compressed air from the portable air tank 110 causes the cylinder rod 145 to quickly extend from the pneumatic cylinder 140. The movement of the cylinder rod 145 raises the net assembly 200, and the fish is netted.
Since the net assembly 200 will remain in the extended position until the valve 120 is used to lower the net assembly, the netting device 300 enables the angler or another person to use both hands to remove the hook from the fish, measure the fish, identify the fish, or whatever else is required before the fish is released or killed. Once the hook is removed from the fish, the valve 120 may be triggered to lower the net assembly 200 below the waterline and allow the fish to escape.
The highest extended position of the net assembly 200 may be determined by adding the distance that the cylinder rod 145 is displaced from the lowest initial position of the net assembly. After the cylinder rod 145 is extended, the net assembly 200 may be positioned so that the net support 220 is above the waterline but the bottom of the net 210 remains a distance below the waterline. Thus the netted fish is prevented from escaping but still remains within the water, which minimizes the harm done to the fish. Alternatively, the initial starting position of the net assembly 200 may be fixed at a point so that after the cylinder rod 145 is extended the entire net 210 is above the waterline.
According to some embodiments of the invention, the angler or another person may adjust the highest position of the net assembly 200 by fixing the initial position of the net assembly at the appropriate depth below the waterline. This may be accomplished by adjusting the position at which the boat attachment 320 connects to the pneumatic cylinder 140. For example, as shown in FIG. 3, the boat attachment 320 is shown attached near the top of the pneumatic cylinder 140. Thus, the net assembly 200 is near the limit of how deep its initial position may be set. If the boat attachment 320 was a clamp, the initial position of the net assembly 200 could be raised by clamping the pneumatic cylinder 140 at a position closer to its midpoint.
According to alternative embodiments of the invention, the maximum height achieved by the net assembly 200 could be adjusted, not by setting its initial depth at the desired position, but by limiting the distance that the cylinder rod 145 is displaced from the retracted position within the pneumatic cylinder 140.
It should be apparent that some embodiments of the invention will have different physical dimensions and shapes compared to other embodiments depending on the size of the boat, and the size of the fish that are expected to be caught. For example, boats that have a larger average distance between the waterline and the tops of the gunwales may require a longer pneumatic cylinder than those boats having a smaller average distance between the waterline and the tops of the gunwales. As another example, the size of the pneumatic cylinder may also vary depending on the average size of the fish that are expected to be caught. A 45 pound Chinook salmon would require a beefier pneumatic cylinder than an 8 pound trout.
Alternatively, some embodiments of the invention may accommodate larger fish by using more than one pneumatic cylinder. For example, the net assembly 200 illustrated in FIG. 2 has only one net attachment 230. Some embodiments of the invention may have a net assembly with two net attachments 230, each net attachment connected to a corresponding pneumatic cylinder 140. In this case, the valve 120 of FIG. 1 may be structured to supply air simultaneously to both of the pneumatic cylinders.
Embodiments of the invention, such as those described above, allow an angler or another person to unhook, measure, identify, or otherwise inspect the fish for legality while the fish remains entirely or partially in the water, thus minimizing the harm done to the fish. Embodiments of the invention also enable an angler to net a fish by himself or herself, without help from other persons, and without requiring the angler to remove a hand from the fishing rod. The angler or another person may also unhook, measure, identify, or otherwise inspect the fish for legality without having to place the fish inside the boat, and without having to use one hand to maintain control of the net. Thus, the amount of additional water and fish slime introduced inside the interior of the boat is minimized, increasing the safety of those standing or sitting inside the boat.
Furthermore, embodiments of the invention are capable of lifting even very heavy fish to a point where it becomes easier for a person to transfer the fish to the boat. According to some embodiments of the invention, the net attachment 230 may be structured to swivel about an axis that passes longitudinally through the center of the cylinder rod 145. Thus, the net assembly 200 and net 210 may be extended from the water, rotated to a point over the inside of the boat, and then lowered again. This movement of the mechanical netting device 300 would allow a person to lift and lower even very heavy fish into the boat with very little effort.
Although the embodiments of the invention described above were illustrated in the context of sport-fishing from a boat, other embodiments could easily be attached to a fixed structure such as a boat dock or a pier. This would allow anglers fishing from shore, and especially handicapped anglers, to more easily catch and release and/or catch and kill their limit of fish.
Embodiments of the invention are also not strictly limited to sport-fishing applications. For example, embodiments of the invention may be useful for those who work with other aquatic species, such as whales, dolphins, alligators, etc. As another example, embodiments of the invention may be useful in search and rescue operations to help retrieve people from the water.
As yet another example, embodiments of the invention may be installed so that people who fall overboard on large boats could accomplish a self-rescue, i.e., the lifting mechanism may be configured to be activated by a person who is treading water adjacent to the gunwale of the boat. Embodiments of this type may be especially useful aboard cruise ships and commercial fishing vessels.
Although the specification may refer to “an”, “one”, “another”, or “some” embodiment(s) in several locations, this does not necessarily mean that each such reference is to the same embodiment(s), or that the feature only applies to a single embodiment.
The preceding embodiments are exemplary. Those of skill in the art will recognize that the concepts taught herein can be tailored to a particular application in many other advantageous ways. In particular, those skilled in the art will recognize that the illustrated embodiments are but one of many alternative implementations that will become apparent upon reading this disclosure. Having described and illustrated the principles of the invention in the exemplary embodiments, it should be apparent that the embodiments described above can be modified in arrangement and detail without departing from such principles. I claim all modifications and variation encompassed by the spirit and scope of the following claims.

Claims

1. A device comprising:

a net support configured to be coupled to a net having a net opening, the net support structured to maintain the net opening in a substantially fixed two-dimensional size and shape;

a net attachment configured to be coupled to the net support; and

a lifting mechanism configured to be coupled to the net attachment, the lifting mechanism configured to automatically raise the net attachment and net support from a starting position to an ending position that is higher than the ending position, an orientation of the net opening in the ending position substantially parallel to an orientation of the net opening in the starting position.

2. (canceled)

3. The device of claim 1, the lifting mechanism comprising:

a pneumatic cylinder having a cylinder rod, an end of the cylinder rod coupled to the net attachment;

an air tank;

pneumatic tubing connecting the pneumatic cylinder to the air tank; and

a valve structured to selectively supply air from the air tank to the pneumatic cylinder.

4. The device of claim 2, the lifting mechanism comprising an electric linear actuator.

5. The device of claim 2, wherein the net is detachably coupled to the net support, the net support is detachably coupled to the net attachment, and the net attachment is detachably coupled to the lifting mechanism.

6. The device of claim 3, the valve structured to be operated by a person's foot.

7. The device of claim 3, further comprising an attachment structured to couple the pneumatic cylinder to a gunwale of a boat.

8. A device comprising:

a rigid net support, structured to be attached to a net opening of a flexible net and structured to maintain the net opening in a coplanar relationship with the rigid net support;

at least one net attachment structured to be coupled to the rigid net support; and

at least one lifting mechanism structured to be coupled to the at least one net attachment, the at least one lifting mechanism structured to independently supply the work necessary to move the rigid net support from a first position to a second position, the first position representing a position of the rigid net support where the rigid net support is prevented from moving further away from the second position, the second position representing a position of the rigid net support where the rigid net support is prevented from moving further away from the first position, an orientation of the net opening in the second position substantially parallel to an orientation of the net opening in the first position.

9. (canceled)

10. The netting device of claim 9, the at least one lifting mechanism comprising an electric linear actuator.

11. The device of claim 8, the at least one lifting mechanism comprising:

a pneumatic cylinder having a cylinder rod, the at least one net attachment configured to be coupled to the cylinder rod; and

an air tank with an air supply that is configured to be connected to the pneumatic cylinder with pneumatic tubing and a valve, the valve configured to selectively provide the air supply to the pneumatic cylinder.

12. The device of claim 11, wherein the valve is configured to be operated by a person's foot.

13. The device of claim 11, wherein the air tank is a portable air tank.

14. The device of claim 11, wherein the at least one net attachment comprises one net attachment that is structured to rotate about an axis that passes longitudinally through a center of the cylinder rod.

15. A sport-fishing netting device comprising:

a net support structured to maintain a net opening of a flexible net in a fixed relationship with respect to the net support, the net support structured so that an area defined by the net opening remains substantially constant and confined to a single plane;

a net attachment structured to attach to the net support; and

a lifting mechanism structured to attach to the net attachment, the lifting mechanism structured to independently supply the work necessary to move the net support from a first position to a second position after the lifting mechanism is activated by an external force, the first position corresponding to a first mechanical limit of the lifting mechanism, the second position corresponding to a second mechanical limit of the lifting mechanism, an orientation of the net opening when the net support is in the first position substantially parallel to an orientation of the net opening when the net support is in the second position.

16. (canceled)

17. The netting device of claim 16, the lifting mechanism comprising an electric linear actuator.

18. The sport-fishing netting device of claim 15, the lifting mechanism comprising:

a pneumatic cylinder having a cylinder rod, the net attachment structured to attach to the cylinder rod; and

an air tank with an air supply that is structured to be attached to the pneumatic cylinder with pneumatic tubing and a valve, the valve configured to selectively provide, when activated, the air supply to the pneumatic cylinder.

19. The sport-fishing netting device of claim 18, wherein the valve is structured to be activated by a person's foot.

20. The netting device of claim 16, the lifting mechanism comprising a hydraulic lifting mechanism.