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1. WO2019043527 - HARPONS PERMETTANT DE HARPONNER UN POISSON

Note: Texte fondé sur des processus automatiques de reconnaissance optique de caractères. Seule la version PDF a une valeur juridique

[ EN ]

SPEARS FOR SPEARING FISH

FIELD OF INVENTION

This invention relates to spears for spearing fish.

BACKGROUND OF THE INVENTION

It is known to provide spears for spearing fish, having spear shafts with detachable spearheads having spear tip for penetrating a fish. Ideally, the spearhead should be driven completely through the body of the fish allowing the spearhead to detach from the spear and toggle on the other side of the fish. The spear shaft can then be retracted allowing the spear fisher to play the fish without the lever arm provided by the spear shaft. It is important that the spearhead should be securely seated on the spear shaft in an arrangement permitting minimal lateral movement of the spearhead relative to the spear shaft. An important consideration in the design of spears having detachable spearheads, is to ensure that the spearheads disengage easily from the spear shaft with minimal frictional resistance whether inside or externally of a fish.

Typical known spears with detachable spearheads are provided with axially aligned spigot and socket type engagement formations providing for axial releasable attachment of the spearhead to a distal end of the spear shaft. Frictional engagement between the spear head and the spear shaft can pose a problem with spears of this type. Ideally, movement during separation of the spearhead from the spear shaft, is in an axial direction, however, due to the requirement of minimal frictional resistance between the spearhead and the spear shaft, a degree of lateral movement is often possible with such designs. This is clearly unsatisfactory and can result in relatively high friction forces occurring as a result of an angular force being applied to one of the spear shaft and spearhead causing the spearhead and the spear shaft to lock together which can prevent or delay detachment of the spearhead from the spear shaft.

A feature of many known spears having detachable spearheads, is the provision of one or more toggles on the spearheads for engaging a fish upon penetration of the spearhead, which prevents or resists the spearhead from being removed from the fish thereby reducing the possibility of the fish escaping. In order to provide for minimal surface area upon penetration of a fish target but provide a relatively large surface area resisting retraction, such toggles are known to be retractably or hingedly mounted to the spearhead.

It is an object of the present invention to ameliorate the abovementioned problems with known spears having detachable spearheads.

SUMMARY OF INVENTION

According to the invention there is provided a spear for spearing fish including: an elongate spear shaft having a proximal end and a distal end defining a sharpened spear tip, the spear shaft defining a longitudinal axis between the proximal and distal ends, and having a spear locating formation disposed at a location near the spear tip and spaced therefrom; and

a toggle removably located on the spear shaft near the spear tip thereof, the toggle having a toggle body defining a channel within which the spear shaft is received in a snug fit, the toggle body defining a toggle locating formation configured for releasable engagement with the spear locating formation when the toggle is located on the spear shaft, the toggle body having an elongate configuration and defining leading and trailing ends relatively closer to the distal and proximal ends of the spear shaft, respectively, when the toggle body is located on the spear shaft.

The toggle body may be thin-walled so as to conform to the profile of the spear shaft.

The toggle body may comprise a pair of spaced side wall sections and an operative upper bridging wall section which extends between the side wall sections and which abuts an operative upper side of the spear shaft.

The spear locating formation may comprise a locating pin projecting from the spear shaft and the toggle locating formation may comprise a complementary locating aperture defined in the bridging wall section of the toggle body for receiving the locating pin therein.

The locating aperture of the toggle body may be in the form of an elongate slot extending in a direction along a longitudinal axis defined between the leading and trailing end of the toggle body.

The locating slot of the toggle body may be located at a position of the toggle body relatively closer to the leading end of the toggle body.

The spear shaft may include an abutment formation near the spear tip configured for abutment with the leading end of the toggle body.

The abutment formation of the spear shaft may comprise a pair of stop pin formations which each extend radially outwardly from opposite sides of the spear shaft.

The toggle body may define a pair of abutment faces at the leading end thereof configured for abutment with the stop pin formations.

Each side wall section of the toggle body may define a particular one of the abutment faces, each abutment face being angled such that an operative lower end of the abutment face is relatively closer to the spear tip than an operative upper end thereof when the toggle body is located on the spear shaft.

The spear may include an attachment cord for attaching the toggle to the spear shaft. As such, the toggle and the spear shaft may define complementary cord attachment apertures which are in register when the toggle is located on the spear shaft, through which the attachment cord passes, in use, for attaching the attachment cord to the spear shaft and the toggle.

The spear shaft and the toggle may each define a pair of the cord attachment apertures thereby permitting the cord to be looped through the toggle and the spear shaft when attaching the cord to the toggle and the spear shaft.

The spear may include a releasable retaining band which is located around the toggle and the spear shaft near the trailing end of the toggle body for releasably holding the toggle body on the spear shaft.

The retaining band may be in the form of an elastic band.

BRIEF DESCRIPTION OF THE DRAWINGS

Further features of the invention are described hereafter by way of a non-limiting example of the invention, with reference to and as illustrated in the accompanying diagrammatic drawings. In the drawings:

Figure 1 shows a three-dimensional view of a spear for spearing fish in accordance with the invention;

Figure 2 shows a side view of the spear of Figure 1 ;

Figure 3 shows a three-dimensional view of the spear of Figure 1 , including an attachment cord for attaching the spear to a speargun;

Figure 4 shows a side view of the spear shown in Figure 3;

Figure 5 shows a three-dimensional view of the spear shown in Figure 3, illustrating commencement of detachment of the toggle from the spear shaft;

Figure 6 shows a side view of the spear shown in Figure 5;

Figure 7 shows a three-dimensional view of the spear shown in Figure 3, illustrating a further stage in the deployment of the toggle wherein the toggle is detached from the spear shaft; and

Figure 8 shows a side view of the spear shown in Figure 7.

DETAILED DESCRIPTION OF THE INVENTION

With reference to the drawings, a spear for spearing fish, is designated generally by the reference numeral 10. The spear (referred to herein as a "fish spear") comprises, broadly, an elongate spear shaft 12 and a toggle 14. The spear shaft is generally cylindrical and has a proximal end 16 and a distal end 18. The spear shaft defines a longitudinal axis A which extends between the proximal and distal ends, with the distal end of the spear shaft defining a sharpened spear tip 20. The spear shaft has a spear locating formation in the form of a cylindrical locating pin 22 disposed at a location near the spear tip and spaced therefrom, at an operative upper side of the spear shaft. The spear shaft includes a pair of spaced cord attachment holes 24 through which an attachment cord 26 for attaching the spear shaft to a speargun, extends.

The spear shaft further includes a pair of stop formations in the form of cylindrical stop pins which extend radially outwardly from opposite sides of the spear shaft. The stop pins 28 are disposed relatively closer to the spear tip of the spear shaft than the locating pin 22 thereof. An operative upper side of the spear shaft has a flat recessed face 30 on which the toggle 14 rests, in use. Similarly, recessed flat faces 32 are formed along sides of the spear shaft for abutment with the toggle 14.

The toggle comprises a thin-walled toggle body 34 which is shaped so as to conform to the profile of the spear shaft. More specifically, the toggle body defines a channel within which the spear shaft is received in a snug fit. The toggle body comprises a pair of spaced side wall sections 36 and a bridging wall section 38 which extends between the side wall sections. The toggle body is configured so as to rest on the spear shaft at an upper side thereof. As such, inner sides of the bridging section and of the spaced side wall sections of the toggle body abut the abutment faces 30 and 32, respectively, of the spear shaft when the toggle body is located thereon.

The toggle body defines a toggle locating formation in the form of an elongate locating slot 40 in the bridging section thereof. The toggle body has a trailing end 42 which is disposed relatively closer to the proximal end of the spear shaft and a leading end 44 which is disposed relatively closer to the distal end 18 of the spear shaft, when the toggle is located on the spear shaft. The locating slot

40 is disposed relatively closer to the leading end 44 of the toggle body.

The spear includes an attachment cord 26 for attaching the toggle to the spear shaft. As such, the toggle body defines a pair of spaced cord attachment holes 46 in the bridging wall section thereof through which the attachment cord 26 extends. The holes 24 in the spear shaft and holes 46 in the toggle body are in register when the toggle is located on the spear shaft, thereby permitting the attachment cord to be looped through the holes for attaching the attachment cord to the toggle and the spear shaft.

The toggle body 34 defines a pair of abutment faces 48 defined at the leading end of the toggle, for abutment with the stop pins 28 of the spear shaft. The abutment faces 48 are defined along leading ends of the side wall sections of the toggle body. More specifically, the abutment faces are straight and angled such that operative lower ends thereof are disposed relatively closer to the spear tip of the spear shaft.

The fish spear includes a releasable rubber retaining band 50 (as is shown in Figure 2 only) which is located around the toggle and the spear shaft near the trailing end of the toggle and which slips off the toggle under water pressure after the spear has been released under power through a body of water.

The toggle body has a wing 52 at its trailing end. In a particular assembly configuration, the toggle may be located on an operative underside of the spear shaft. In this assembly configuration the wing 52 assists in lifting the spear shaft as it travels through a body of water to compensate for lowering of the spear shaft as the spear follows an arched trajectory through the water.

In use, the thin-walled toggle body which defines a channel within which the spear shaft is received in a snug fit, ensures that the toggle body conforms generally to the profile of the spear shaft presenting minimal additional surface area which may cause drag while the spear travels through water towards a target fish. The profiled abutment faces 30, 32 on the spear shaft further enhance seating of the toggle on the spear shaft while minimally increasing the cross-sectional profile of the toggle relative to that of the spear shaft.

Location of the toggle on the spear shaft is achieved by the shape of the toggle which fits onto the spear shaft and via releasable location of the locating pin 22 of the spear shaft within the locating slot 40 of the toggle. This results in minimal frictional engagement between the toggle and the spear shaft resulting in easy detachment of the toggle from the spear shaft.

The location of the elastic band 50 around the toggle and the spear shaft and abutment of the abutment faces 48 at the leading end of the toggle body against the stop pins 28 of the spear shaft, stabilise and assist in retaining the position of the toggle on the spear shaft. In use, water pressure after release of the fish spear under power through water, causes the elastic band to slip off the toggle, readying the toggle for deployment. While the spear travels through the water,

the force of the water flowing over the toggle keeps the toggle closely located on the spear shaft similar to a conventional spear having a barb fixed to a spear shaft.

As the spear is shot from a spear gun, the toggle remains located on the spear shaft providing the spear with a streamlined profiled as it travels through the water thereby ensuring an accurate flight path. The locating pin 22 of the toggle provides for location of the toggle on the spear shaft and also prevents the toggle from sliding rearwardly along the spear shaft as the spear shaft accelerates through the water after being shat from the spear gun. As the spear travels through the water towards a target fish, the spear begins to decelerate, due to drag forces acting on the spear. The stop pins 28 prevent the toggle from sliding forward as the spear decelerates.

Upon penetration into a fish, the spear shaft decelerates appreciably causing the toggle to decouple from the spear shaft. More specifically, the trailing end of the toggle lifts off the spear shaft, with the stop pins 28 acting as a fulcrum about which the leading end of the toggle rotates. The Applicant has found that a rotation of about 5 degrees results in decoupling of the toggle from the spear shaft. Upon deployment, the toggle either becomes lodged within the body of the fish or if the spear extends through the body of the fish, the toggle is positioned transversely with respect to the spear shaft on an opposite side of the body of the fish, thereby preventing separation of the fish from the spear.

The Applicant believes that the fish spear in accordance with the invention, addresses the problems described hereinabove associated with known fish spears having detachable spearheads.