Illumination means for low-light and night use, suitable for mounting on a fin or skeg, a method of fitment and kit of parts

Abstract

An illumination means 50 is integrally formed with or attachable to a fin, blade or other applied surface 100 of a water sports boards (PB), boat or other watercraft. The illumination means ideally comprises a housing (51, 52, Fig 11) having a LED cluster assembly (53, Fig 11) at one end and accommodating a rechargeable battery pack (40, Fig 10). An integral fin and illumination means may include a retention portion (6, Fig 1) directly coupled in use with a retention box (RB, Fig 7a) within the base of a board (PB, Fig 7a) or hull of a craft. Adaptors (20, Fig 7d) may be provided for engagement to standard retention box configurations. In one embodiment an engagement surface (56, Fig 16) may be provided to secure the illumination means to a fin, blade, or other applied surface. The engagement surface may comprise an insert or be formed by an additive manufacturing process. Methods of attachment of the illumination means to watercraft, to apparatus such as SCUBA equipment and outboard motors for small vessels and to swimmers are also disclosed.

Description

Field of the Invention The present invention relates to an illumination means for providing enhanced visibility and hazard perception predominantly in water sports activities, particularly those related to water sports board activities, boating and swimming. Particularly, the invention related to the provision of an illumination means integrally formed with or securable to a fin or blade-like surface, for coupling or fixing to a water sports board, recreational vessel, including kayaks and canoes, or any other applied surface. Most particularly, the invention relates to an illumination means integrally formed with or securable to a fin or skeg for a water sports board, such as a surfboard or paddleboard facilitating the use thereof in low light conditions and for potential night use. The invention further relates to apparatus, engines and craft having fin or blade-like projections having integrally formed therewith or secured thereto an illumination means. The term “fin” and “skeg” are used interchangeably within the description that follows and should not be taken as limiting to the nature or profile of any blade-like projection whether used for steering or stabilisation of a water sports board or any other craft or vessel to which the subject of the invention is applied. Although the term “skeg” has a long tradition in marine vessels and is associated with a rearward projection of the keel of a boat and notably for providing protection to the propeller of, for example an outboard motor, it was also adopted during the development of surfing to define a fin (there often being more than one) towards the rear of the surfboard. As windsurfing developed daggerboards were added and through-board -2-arrangements allowed retraction or rearward folding to prevent damage when approaching shallow water or beaching. Skegs also tended overtime to suffer damage and were often presented as removable from the board. So that skegs or fins could be easily removed from windsurfer boards, fins were provided with retaining portions adapted to be received within so-called “retention boxes” attached to or formed within a cavity provided at the base of the board. Various means were provided to ensure secure engagement, including those that require the use of bearing surfaces and interference-fit elements, however, many of the more basic designs (such as those used on inflatable paddleboards) include at least an element of sliding engagement. Bodyboarding, paddleboarding and kitesurfing are the natural descendants or spinoffs of surfing and include many common features, including a retention box for each fin. It will be appreciated that an alternative securing receiver may be provided on a water sports board or water craft. The term “applied surface” is primarily directed to a fin, skeg or blade-like surface to which an embodiment of the invention as detailed hereinbelow may be attached or via an adaptor fixed to a water sports board, recreational water craft or vessel, however, the term does not preclude other articles, interfaces and pieces of equipment which, or wearable attachments for personnel who, may support or carry said embodiments. In general, water sports board activities such as those identified above have heretofore been predominantly daytime activities, however, as with many sports and activities, there is a desire to extend the hours within which an activity may be enjoyed. Most other marine vessels are obligated to have running, masthead or navigation lights, however, no such obligation exists for many smaller unpowered craft. Maintaining visibility to other vessels and craft significantly reduces collisions and this becomes critical in low-light conditions, particularly when there can be such a disparity in craft size and there exists an inherent vulnerability of the water sports board user. Dinghies, which are often used as tenders to larger vessels, regularly are used for transfers when lighting conditions are less than ideal. Not only is navigating difficult in such conditions but there is a significant risk of damaging an outboard motor on subsurface hazards. Where a motor or propeller is damaged, landing an unpowered craft can be extremely challenging, putting passengers and crew at risk. Skegs are normally provided to protect the propeller from fouling by vegetation and light impact. Providing illumination to small craft and to water sports boards where lights are regularly or constantly exposed to water, particularly sea water, has provided a number of technical challenges. Prior art solutions directed to solid hulled craft or to such craft where the integrity of the exposed surface is not critical are rarely applicable to water craft such as dinghies, kayaks, canoes or water sports boards. Clearly, screw mounted attachment means are unsuitable for such craft or where they may be at the expense of the integrity of the skin or hull of the craft. Detachable lights provide particular challenges in this regard, however, these are the most common solutions as lights often need to be removed to recharge or replace batteries. Strap attachments often become loose and lights can become lost in the water or the straps can become entangled occasionally causing hazardous situations for the surfer or a kayaker. Known solutions provide LED light strips along the edges or undersides of boards, however, adhesive rapidly breaks down and at least one separate compartment is needed for the or each battery, a switch and a charging port (if required). Where wireless charging is provided, a contact surface must be selected, if the charging circuit is not to be embedded in the surfboard skin (again potentially undermining its integrity). Background to the Invention Many water sports are now becoming available to a wider audience, with additional access to inland waterways and lakes being utilised by paddleboarders, previously the reserve of canoeists, kayakers, small sailing boats and pleasure cruisers. This can bring together slow-moving vulnerable users with larger, faster or less manoeuvrable vessels. Many inexperienced users or participants are exposed to risks of which they are unaware or for which they are ill-prepared. In an attempt to obviate some of the disadvantages highlighted above, solutions suggested by the prior art appear to be concerned predominantly with disguising a craft to prevent predation or to visually enhance a water sports board for mainly aesthetic purposes. United States Patent Application Publication No. 2006 / 0094315 to BRODSKI advocates the use of lights, including LED, to protect users of surfboards, kayaks and other water activity apparatus from water-borne predators including sharks by distorting the outline of the craft and user to camouflage both user and craft. An array of discrete lights disposed along the underside of a water sports board and on the hull and sides of a boat or kayak is disclosed. The identical safety issue, that is potential predation by sharks, is also addressed in United States Patent No. 10,773,778 to SHAFFER et aL, in which a self-contained disk-shaped housing incorporating an array of LED and a battery pack is fixed to the underside of a water sports board, such as a surfboard. Neither of the above disclosures consider the observation of potential impact hazards or the detection of a user by other vessels in low-light conditions. United States Patent Application Publication No. 2016 / 0257383 to MASSON et al. suggests the use of transparent sections within the body of a water sports board for allowing a user to observe or record with a camera sub-surface features or aquatic life. There is also disclosed the use of a light source beneath the board, in one construction extending around the periphery of the bottom surface of the board, and the exemplifying use of a camera that is embodied and powered by a smart phone. In the same vein, United States Patent Application Publication No. 2017 / 0233043 to THORSON (Sony Corp.) discloses a water sports board having a rotatable housing recessed into the underside for facilitating the transmission of video images to a screen mounted forward of a user for live-viewing. Numerous other disclosures in the prior art describe the use of cameras to view flora and fauna beneath watercraft, none however discuss any safety attribute as a primary focus. Indeed, it is unlikely that a board or other craft user would be able to react timely to visual indicia of hazards directly below the board or craft. None are designed to protect the user from potential hazards or aid visibility to other vessels. With the wider appeal of leisure activities on both inland and marine waterways, the market sector is increasingly aware of safety concerns surrounding use of small vessels and water sports boards in diminishing light. To that end a number of solutions have been presented to enhance the visibility of board users to one another and to others. United States Patent Application Publication No. 2013 / 0165003 to McKINNEY advocated the use of a “glow in the dark” paddleboard in which the upper surface thereof includes a photoluminescent element enabling a companion or rescuer better to visualise the user. The disclosure notes that the enhanced visibility of the board makes it less likely for accidents with passing boats to occur. United States Patent Application Publication No. 2017 / 0225754 to KEDDINGTON also discloses a “light up surfboard” in which a wirelessly chargeable, battery-operated LED configuration (specifically LED strips) is assembled into the base of a water sports board and sealed therein to render it waterproof. Although intended to create “light up effects”, only casual reference is made to the increased visibility of a board in dark or low-light conditions. Where it is convenient to do so, routing channels may be provided within the boards, such as those illustrated in United States Patent Application Publication No. 2019 / 0185144 to VOAKLANDER where electronics associate with a string of preferably programmable LED are embedded within a waterproof cavity in the board. The objective stated is to provide decorative embellishments to a board capable of withstanding the rigours of children playing thereon in an aquatic centre or water park. Of the objectives stated, none include visibility for safety. In United States Patent Application Publication No. 2020 / 0216146 to BELL, a string of LED lights is provided along the periphery of a fin or skeg. In the illustrated embodiment, a sealed strip of LED is fixed within a preformed cavity along the periphery thereof, the fin having a compartment within which a battery may be sealingly enclosed. A “glowing fin” embodiment is also envisaged. The disclosure notes benefitting the user with additional visibility at night and also illuminating the water below the board for an overall enhanced experience. It is an object of the present invention to seek to alleviate the above disadvantages and to provide an illumination means to assist in attenuating the risks associate with multiple hazard sources. It is an object of the invention to provide an illumination means suitable for enhancing the visibility of and for a user. It is an object of the invention to provide an illumination means that is easily attachable to a water craft and other exemplifying applied surfaces. It is further an object of the present invention to provide an illumination means that is detachable from a water sports board or other vessel when not in use. It is a yet further object of the present invention to provide a fin or skeg having an illumination means integral with or attached thereto that can be swiftly attached to a water craft having a retention box recessed within or attached thereto. It is also an object of the present invention to provide a safety illumination means for water-boarders, canoeists, kayakers and operators of small boats and leisure -7-craft particularly for observing subsurface obstacles when approaching shore, quaysides, mooring piers or the like. It is additionally an object of the present invention to provide a method of attaching an illumination means to a fin, skeg, blade or other applied surface to provide enhanced visibility and hazard perception. It is a yet further object of the present invention to provide a kit of parts facilitating the releasable attachment of an illumination means to an applied surface. Summary of the Invention In its first aspect, the present invention provides an illumination means operably attached to a fin, blade or other applied surface, in which the illumination means comprises a substantially streamlined housing secured to said surface and having at one end a light cluster assembly and encapsulating therewithin a battery pack. In its preferred use, the illumination means operably transmits a beam of light to illuminate a volume of water allowing for increase hazard perception by a user and increasing visibility for and by a user particularly in low-light conditions. In a first exemplifying embodiment, the housing and surface are integrally formed to present an illuminated fin or skeg. In a second exemplifying embodiment, the housing includes an engagement surface adapted to secure the illumination means to said fin, blade or applied surface. Preferably, the applied surface comprises a fin or skeg having a retaining portion adapted operationally to engage a retention box on the water craft or vessel to which the fin or skeg is attached in use. Conveniently, the retaining portion is adapted to engage with the retention box. In the first exemplifying embodiment, the retaining portion is profiled slidingly to engage with a correspondingly profiled retention box. This is presented as an alternative to known commonly available retention boxes where the retention -8-portion of a fin includes interference-fit features, pivot pins and profiled bearing surfaces profiled to secure the fin to the board-mounted retention box. Advantageously, a series of adaptors may be provided each having engaging features of commercially available skegs and fins to interface between the retaining portion and the corresponding retention box. In an alternative construction, the illumination means is adapted to be secured directly to a water sports board, the hull or gunwale of a water craft or to the float or pontoon of a floatplane or seaplane. Preferably, the housing comprises a pair of adjacent housing sections. Ideally, the housings are substantially tubular. Advantageously, one of the sections of the housing is adapted to provide positive buoyancy to the illumination means. This overcomes one of the significant disadvantages of some of the prior art devices, particularly those held to craft by straps or suction-cup devices which can become detached and sink, often irretrievably. In a preferred construction of the second exemplifying embodiment, the engagement surface is disposed between the pair of housing sections and attaches by interference fit to the fin, blade or applied surface. Advantageously, the engagement surface comprises a removably and replaceable insert. This arrangement can be used to overcome potential wear or to allow the internal surfaces to be cleaned to remove sand, sediment or debris such as vegetation. Also this allows for a degree of variation for different thicknesses of fin, blade or alternative attachment means as detailed hereinbelow In a preferred construction, the engagement surface comprises successive textured flexible surface features to provide enhanced grip on the applied surface. Most preferably, the textured flexible surface features of the engagement surface are formed by an additive process, such as 3-D printing, thereby allowing for each embodiment to be constructed using 3-D printing. In a third aspect of the invention, there is provided a method of attaching an illumination means of the type defined hereinabove to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or pontoon of a seaplane, the method comprising: presenting a fin or blade-like surface having a mount thereon defining a retaining portion and adapted to be received within a retention box recessed in or affixed to a corresponding surface of the vessel; and fixing the fin mount within the retention box of said vessel, the illumination means being integral to or attached to the fin or blade-like surface. Conveniently, the illumination means is attached to the fin, blade or applied surface via an engagement means which includes successive textured flexible surface features to ensure the illumination means is retained in position during use. In a fourth aspect of the invention, there is provided a kit of parts for the preferred embodiments of the invention. In a first kit of parts for an illumination means suitable for attachment to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or seaplane, the kit comprises: a fin, skeg or blade-like surface having an illumination means integrally formed therewith; and a mount adaptor for interfacing between a retaining portion of the fin, skeg or blade-like surface and a retention box of a water sports board or alternative securing receiver of a craft. A second kit of parts for an illumination means suitable for attachment to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or seaplane, the kit comprises: an illumination means having a housing which includes an engagement surface adapted to secure the illumination means to a fin, skeg or other applied surface; and a replacement engagement surface. Advantageously, the engagement surface comprises an insert adapted to fit between adjacent housing sections of the illumination means. Preferably, the engagement surface insert has successive textured flexible surface features (“cilia grip”). Conveniently, each kit of parts may further comprise any one or more of a battery pack within a waterproof enclosure; replacement battery cells; charging cable and adaptor; replaceable light cluster assembly; light cluster assembly with integrated camera lens; an attachment means for securing the illumination means to apparatus or to the leg or arm of a swimmer, snorkeler or diver; and body inserts for colour and design variation and / or personalisation. In alternative constructions, an attachment means includes a fixing surface, which supports a fin or blade-like projection substantially perpendicular thereto, the fixing surface including apertures through which securing straps may be threaded. The securing straps facilitate the attachment of an illumination means of the invention to apparatus, for example, a SCUBA tank of a diver. Variations of the attachment mean allow for the illumination means to be worn on the thigh or wrist of a -11-swimmer, snorkeller or SCUBA diver. In a thigh worn adaptation, the blade-like projection extends laterally and perpendicular to longitudinal axis of leg, so that an attached illumination means casts a beam of light forwardly when wading, for example, to or from shore, and downwardly when swimming or snorkelling. Similarly for a wrist attachment, the blade extends laterally but parallel to the longitudinal axis of a user’s arm, so that an attached illumination means casts a beam of light downwardly when wading (or as directed by the user) and forwardly where a user is swimming, snorkelling or SCUBA diving with an outstretched arm. In a fifth aspect of the invention, there is provided a fin, skeg or other blade-like applied surface, the fin extending from a mount configured to couple the fin to the board and having an illumination means in accordance with the invention secured to or integrally formed with the fin. In a first preferred construction, the fin, blade or other applied surface suitable for attaching to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or seaplane, the fin, blade or applied surface having an illumination means integrally formed therewith, so as to provide improved visibility to and for a user and to provide enhanced hazard perception to a user of said board, vessel or craft. In a second preferred construction, the fin, blade or other applied surface suitable for attaching to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or seaplane, the fin, blade or applied surface having an illumination means attached thereto via an engagement surface comprising successive textured flexible surface features (referred to hereinafter as a “cilia grip”). The invention in a further aspect provides a water sports board, waterways vessel or craft having secured thereto at least one of the fins, blades or applied surfaces as defined above. Accordingly, the invention defines a water sports board, hulled vessel or a craft having pontoons or floats thereon on which there is disposed at least one fixing element comprising a retention cavity for receiving a mount of an illumination means, said mount operably retaining a housing having at one end a light cluster assembly and encapsulating a battery pack therein. In a yet further aspect of the invention, there is provided an attachment means for a swimmer, snorkeller or SCUBA diver, comprising a component, having a fin or blade element, to or through which attachment straps are provided for securing to the body of a user or to the air tank of a SCUBA diver, the fin or blade element operationally having an illumination means secured thereto to provide enhanced visibility and hazard perception to the user. In yet a further aspect of the invention, there is provided an outboard motor for a small vessel, to which there is attached an illumination means of the invention. In an ideal construction, the propeller guard skeg has an illumination means integrally formed therewith or securely attached thereto via an engagement surface. Attachments for securing an illumination means to an outboard motor are also considered. Brief Description of the Drawings The invention will now be described more particularly with reference to the accompanying drawings which show, by way of example only, two embodiments of illumination means for low-light and night use, suitable for mounting on a fin, skeg or other suitable applied surface. Reference is also made to a method of fitment and to a kit of parts in accordance with the invention. In the drawings: Figures 1 and 2 are front and rear elevations respectively of a first embodiment of illumination means according to the invention integrally formed with a fin or skeg; Figures 3 and 4 are a side elevation and a side perspective view of the first embodiment of illuminated fin, respectively; Figures 5 and 6 are further perspective views of the first embodiment of illuminated fin; Figures 7a and 7b are perspective views of the first embodiment of fin or skeg in a retention box mounted to or integrally formed on the underside of a recreational watercraft such as a surfboard or bodyboard; Figures 7c and 7d are perspective views of a retention box adaptor and an adaptor attached to the retaining portion of a fin of the first embodiment; Figure 8 is a top perspective view of the illuminated fin or skeg, illustrating a charging port and sealed access covers in a retention box engaging portion of the fin; Figures 9 and 10 are sectional elevations of the fin or skeg illustrating the charging control circuitry and battery housing location within the skeg and battery housing, respectively; Figures 11 and 12 are front and rear elevations respectively of a second embodiment of illumination means according to the invention mounted on a fin, skeg or similar applied surface; Figures 13 and 14 are first and second perspective side elevations of the second embodiment of illuminated means, respectively; Figures 15a and 15b are perspective views of the second embodiment of illumination means attached to a fin or skeg mounted to or integrally formed on the underside of a recreational watercraft such as a surfboard or bodyboard; and Figures 16 and 17 are a bottom plan elevation and perspective elevation respectively of the second embodiment of illumination means detailing the preferred means of securing the housing thereof to an applied surface. Detailed Description of the Preferred Embodiment Referring to the drawings and initially to Figures 1 and 2, a first embodiment of -14-illumination means 1 in accordance with the invention comprises a housing 2 having a light cluster assembly 3 at a forward end thereof for operably projecting a beam of light. The housing which preferably has a streamlined, substantially tubular profde, sealingly accommodates a battery housing within which are disposed preferably rechargeable lithium ion cells, as shown in more detail in Figures 9 and 10. Integrally formed with the housing 2 is a fin or skeg body 5 having a blade-like profile substantially similar to a standard water sports board fin but intersecting with the housing 2 of said illumination means. At its upper end, the fin body 5 includes a retaining portion 6 having laterally projecting elements 7 adapted to engage corresponding receivers within a retention box RB (also known as a “skeg-box”) of a surfboard, windsurfer, paddleboard PB or similar recreational water sports board, for example, as shown in Figures 7a and 7b. Optionally, the retaining portion 6 is profiled to be slidingly received within a simple correspondingly profiled channel to allow for rapid manual attachment and detachment of the fin. Figures 3 and 4 show, amongst other features, that the exemplifying housing of the first embodiment is ideally inclined downwardly to project light thereby illuminating a body of water or subsurface features forwardly of and below the central longitudinal axis of the board or craft to which the fin or skeg is attached. A registering catch 8 may also be provided adjacent the retaining portion 6 to engage a corresponding interference-fit portion within the receiving channels of the retention box RB. It will be seen additionally in Figures 5 and 6, that the profile of the integral fin body 5 may be broader than that of a conventional fin or skeg without losing the stability normally afforded. Preferably, a recycled or recyclable thermoplastics material is used in its construction giving it the required rigidity and strength-to-weight ratio associated with fibreglass fins. The body is optionally of a clam-shell design but is preferably constructed using an additive process such as 3D-printing. The body may include a number of profiled surfaces to aid fluid flow therearound and to enhance its aesthetic appeal. The major planar surfaces of the fin body 5 may additionally include replaceable inserts allowing for creative design and colour variations and user personalisation. On the upper surface of the retaining portion 6, best seen in Figures 4 and 8, first 11 and second 12 sealable access covers protect charging control circuitry. One of the covers also includes a charging port for accepting a standard charging cable CC, ideally comprising a USB-C configuration to obviate the use of bespoke charging adaptors. In an alternative construction or as an additional feature, a wireless (inductive) charging surface may be provided on a side surface of the body 5 to allow charging of the battery cells without removing the fin from a board or other body to which it is attached. In one construction a waterproof microswitch is provided on the retaining portion, ideally located behind and actuated by movement of one of the access covers, for example, the second access cover 12, when the fin is located into a retention box RB. The integral illumination means and fin 1 of the first preferred embodiment is shown in situ in Figure 7a attached via the retaining portion 6 to the retention box RB disposed within the underside of a paddleboard PB. In the exemplifying arrangement illustrated in Figure 7b, the retention box is embedded within the underside of the water sports board (in this case a paddleboard PB) and includes supporting flanges bonded thereto to maintain the integrity of the board. This is particularly important for boards having an open-cell internal structure protected by a moulded skin or outer resin-bonded layer. As noted in the preamble to the description, the provision of mounting bolts or attachments fixed by screw fasteners often damages the integrity of the skin or outer layer, allowing water to accumulate over time within the board, rendering it heavy and useless for its intended purpose. The retention box includes a receiver slot adapted to fixingly secure the projecting elements 7 of the retaining portion 6. Figure 7c illustrates one of a range of retention box adaptors 20 which allow for the use of the integral illumination means and fin 1 with a corresponding range of common retention boxes of commercially available water sports boards. The adaptor 20 defines a retention portion receiving channel 26 having a plurality of receivers 27 for engaging the projecting elements 7 of retaining portion 6 to interface with the fin body 5. The adaptor 20 includes profiled elements 28 having engagement features 29 to allow it to lock into a retention box having corresponding receivers, channels and interference-fit retention elements. An adaptor 20 is shown in Figure 7d coupled to the first embodiment of illuminated fin 1. Ideally, the adaptor includes means for actuating the microswitch to power the illumination means when the fin of the invention is attached to a board. Further adaptors 20 or attachment means may be provided the securing the illuminated fin 1 to the hulls of other vessels including kayaks, canoes, small boats, sailing boat outriggers, the pontoons of seaplanes or floatplanes and even to submersible craft, such as remotely operated vehicles (ROV). It will be clear to the skilled addressee that the illumination means of the invention can easily be adapted for additional or alternative applications, a number of which being exemplified with respect to the second embodiment of the invention as described in more detail hereinbelow. In the sectional elevations of Figures 9 and 10, a charging cable CC connected via a charging port CP provides power to the control circuitry board 31 for charging the battery cells held within an optionally removeable battery housing 40 retained within the body 5 behind the light cluster assembly 3. The battery housing comprises a tubular section 41 within which rechargeable cells 43 are disposed and retained therein by sprung end caps 45 having conductive elements adapted to present power to the light cluster assembly. In a preferred construction, the light cluster comprises a 21 Watt, 6000 Lumen hybrid 450nm and cool white “ultra bright”, high efficiency LED array, usually provided in a COB (chip-on-board) configuration disposed behind a sealed lens optic. The optic is adapted to focus the emitted light into a beam sufficiently narrow as to penetrate a volume of water forward of the board. In use, the LED array is water-cooled but includes a 45C thermal cut-out switch. Laser diodes may also be used in the cluster either as an alternative or in combination with LED. The beam is naturally diffused in the water to provide illumination for subsurface features, contrary to LED strips which provide omni-directional light having limited -17-penetration power and do not provide sufficient illumination for long-range visibility. The LED / laser array is ideally located on a cluster assembly printed circuit board (PCB) and includes a thermistor to detect elevating temperatures within the cluster assembly. When water cooling is insufficient and the temperature exceeds a predetermined threshold, for example 45C, the thermistor isolates the array. Failsafe provisions within the control circuitry board 31 prevent power being reconnected where the thermistor itself fails. Within the PCB, a light sensing diode and associated logic enables power-up of the array when light levels drop below a threshold that would normally be indicative of dusk. The array may power-up when encountering murky waters which may indicate subsurface perturbations often associated with hazards. The lightdependent power-up prevents unnecessary battery usage particularly where the benefits of illumination are minimal. The feature may also be utilised to obviate manual power switching of the illumination means. Ideally, a manual switch (possibly requiring the user to dismount the board or otherwise involve physical intervention) is obviated by the combined provision of a microswitch activated during engagement of the fin to a board or craft and a light-sensing logic switch. The battery cells are ideally 42Wh lithium-ion cells, such as those available from LG Electronics, Inc. to give approximately 2.5 hours continuous use at full brightness. Battery cells may also be selected from 18650 or 21700 type cells where the combined length of two cells of the respective types within the housing 40 will be of a similar dimension to that of a standard fin. The control circuitry circuit board 31 comprises cell protection circuitry to prevent over / under charging of the cells 43 and driver circuitry for the light array 3. Current limiting ensures that each cell operates within optimal parameters and minimises the risk of cell damage, thereby prolonging its service life. Although noted as optionally removable, the battery housing 40 may also be of a fixed or embedded design. At the positive terminal 45 (in the fixed battery version), a copper wire is crimped to the positive terminal and the hole through which the wire passes is sealed using epoxy resin, hot-melt glue or a selected potting compound. Solderless cell connection is achieved via compressible tube inserts which seal against the tube and cell and also compress a nickel cell contact crimped to a wire against the positive and negative face of the cell. The use of solderless cell connections within the battery housing avoids fixing rare-earth metals / materials (specifically, lithium) within the device permanently. An aluminium housing tube 41 provides a waterproof seal and additionally provides strength and cooling at low cost. It will be appreciated by the skilled addressee that the features of the first embodiment of the invention may be applied to any detachable fin or blade-like structure, augmenting the object to which it is attached or with which it may be integrally formed, to providing illumination, particularly where a fixed illumination means does not provide the sought after advantages. A second embodiment of illumination means 50 in accordance with the invention is illustrated in f igures 11 and 12 and comprises first 51 and second 52 housing sections (said first section having a light cluster assembly 53, as before) connected to one another by a body matrix 54. The matrix is disposed centrally between said housing sections 51, 52 and includes an engagement means 56 adapted to receive and adhere to a fin 100, skeg or any other blade-like applied surface having a substantially similar profile and having a retaining portion 106 with lateral projecting elements 107 and adapted to be received within a retaining box RB of the type discussed hereinbefore. As shown in Figures 13 and 14, when mounted on a fin 100, the housing sections 51, 52 (again ideally being substantially tubular) are disposed on opposite sides of the presented major surfaces of the fin 100. The engagement means 56 includes gripping surfaces 58 having a bias which must be overcome to push the fin between the housing sections, whereafter the illumination means 50 is forcibly slid towards the retaining portion 106 of the fin 100. Sufficient room must be left between the housings and the retention portion 106 to allow the fin 100 to be fixed to a water sports board, leisure craft or like applied surface whether directly, to a -19-correspondingly profiled retention box or via an adaptor 20 of the type illustrated in Figure 7c. Figures 15a and 15b show the illumination means 50 attached to a fin 100 which may be of the fixed type or of the type having a retaining portion 106 engageable to a retention box RB integral with the base of a board PB, as illustrated. The illumination means 50 may also be attached to an alternative surface such as the hull of a kayak, canoe or water craft by the addition of an attachment means incorporating a blade- or fin-like structure onto which the illumination means of the invention may be secured. Finally, with reference to Figures 16 and 17, further details of the body matrix 54 show the positioning of the engagement surfaces 56 between the tubular housing sections 51, 52 of the second embodiment of illumination means. The engagement surfaces 56 face one another and provide an interference fit with the fin, skeg or other blade-like structure 100 to which the illumination means 50 is attached. The engagement surfaces 56 ideally comprise “cilla-grip” formations 58 thereon where successive textured flexible surface features provide enhanced grip to the applied surface. This grip is further enhanced in wet conditions. In one construction of the second embodiment, the engagement surfaces 56 comprise a rubberised insert positioned within the body matrix 54 between the tubular housing sections 51, 52 of the illumination means. Most preferably, the cilla-grip engagement surfaces 58 are formed during an additive (3D printing) process. With the provision of a second housing section (whether as shown with respect to the second embodiment or incorporated into an unillustrated variant of the first embodiment), one of the housing sections may comprise a sealed flotation aid to provide positive buoyancy to the illumination means. The invention defines also a method of attaching an illumination means having an integral fin to a water sports board, hull or gunwale of any type of water craft, to the float of a floatplane or pontoon of a seaplane or even to a manned submersible or remotely operated vehicle (ROV). The method comprises presenting a fin or blade-like surface having a mount thereon defining a retaining portion (or an adaptor mount) and adapted to be received within a retention box recessed in or affixed to a corresponding surface of the vessel; and fixing the fin mount within the retention box of said vessel. Where the illumination means is attached to the fin, blade or applied surface via an engagement means attached to or part of a housing section, the method includes the use of successive textured flexible surface features to ensure the illumination means is retained in position during use. As will be seen from the foregoing, the use of recycled or recyclable material is advocated where possible. Accordingly, where the fin, body and / or housing sections are 3D printed, recycled TPE / TPU may be used (for example, in preference to PVC) and is again recyclable at the end of product life. As noted in the assembly of the battery pack, solderless connections enhance opportunities for recycling. Furthermore, glueless assembly is advocated to simplify material recovery and recycling. Furthermore, the availability of kits of parts provides more flexible retail options where a purchaser (particularly online) may choose only the components required for a particular use or replace only the components damage, loss or worn. Accordingly, a kit of parts for a first embodiment includes as essential components: a fin, skeg or blade-like surface having an illumination means integrally formed therewith; and a mount adaptor for interfacing between a retaining portion of the fin, skeg or blade-like surface and a retention box of a water sports board or alternative securing receiver of a craft. Similarly, a kit of parts for an illumination means of the second embodiment includes: an illumination means having a housing which includes an engagement surface adapted to secure the illumination means to a fin, skeg or other applied surface; and a replacement engagement surface. Further components available individually or as part of a kit of parts may include one or more of a battery pack within a waterproof enclosure; replacement battery cells; charging cable and adaptor replaceable light cluster assembly; light cluster assembly with integrated camera lens; an attachment means for securing the illumination means to apparatus or to the leg or arm of a swimmer, snorkeler or diver; and body inserts for colour or design variation and / or personalisation. The light source used in each embodiment is formed of an array of LED provided on a PCB. Alternative light sources may be used without departing from the scope of the invention. Currently, however, the best performance in terms of output, water penetration and overall visibility for a useful period from a battery pack, such as that described, utilises a hybrid array of 450nm and “cool white” LED. Blue light LED operating in the range of 450 to 470nm achieve maximum efficiency in terms of lumen per watt and best penetration through water. Alternative colour LED may also be used and programmable or remotely activated switching provides aesthetic results. Ideally, the array is presented in a circular configuration allowing for use of commercially available LED optics. A further advantage of a circular configuration facilitates the formation of a light-shielded passage from the lens surface to or through the array PCB. This allows the light sensing diode to be unaffected by the LED array or, in an alternative construction, a camera sensor chip to be provided behind the array PCB. Accordingly, a remotely actuable image and / or video camera may be provided within the illumination means housing. The control circuitry board 31 includes logic circuitry which allows for additional safety features to be included in the illumination means of the invention. In a low battery mode, for example, the LED array can be triggered to flash once per second to preserve limited power whilst still providing illumination for a user and visibility of the user to others. As available power decreases, flash intervals increase thereby providing significant additional time for rescue services should a user be unable to return to shore or otherwise become lost at sea. It will be clear to the skilled reader that the second embodiment of illumination means may be attached to any existing or provided fin or blade-like projection. Where such projection is not available, one may be provided. Accordingly, in addition to the applied surfaces discussed hereinabove, the second embodiment of illumination means is inherently adaptable. An alternative attachment insert may be provided to present a fixing surface having, for example, screw holes through which an illumination means may be secured to any surface. Additional insert may present strap loops through which securing straps may be threaded. Similarly, the first embodiment of illumination means may be adapted for use in the manner considered above by utilising an adaptor operably attached to the retaining portion of the fin to facilitate the use of fixing screws or securing straps. Thus, in an alternative arrangement, fin or blade elements projecting from perpendicular fixing surfaces (which ideally have securing straps threaded therethrough) may be secured to SCUBA tanks or to the thigh or arm of a wearer. In a thigh-worn configuration, the fin or blade element, to which the illumination means is attached in use, facilitate forward projection of the light beam generated when walking in shallows (or when surfing or paddleboarding) and a downwardly projecting beam when swimming. Similarly, a wrist-worn configuration projects a downwardly light whilst walking (assuming arms are maintained downwardly) and may be projected forwardly whilst swimming, snorkelling or SCUBA diving. From a commercial perspective, the invention provides a fin for a water sports board, the fin extending from a mount configured to couple the fin to the board and having an illumination means secured to or integrally formed with the fin. In a preferred commercial guise, there is presented a fin, blade or other applied surface suitable for attaching to a water sports board, hull or gunwale of a boat or to the float of a floatplane or seaplane, the fin, blade or applied surface having an illumination means integrally formed therewith, so as to provide improved visibility to and for a user and to provide enhanced hazard perception to a user of said board, vessel or craft: Additionally, the invention provides a water sports board, waterways vessel or craft having secured thereto at least one of the fins, blades or applied surfaces as hereinabove defined. As noted above, the invention provides an illumination means adapted to enhance the utility of existing pieces of apparatus, such as a SCUBA tank. Numerous other adaptations and enhancements are considered and within the scope of the appended claims. By way of example, as noted above, dinghies are often used as tenders for larger craft and for general short distance transportation and logistics. Many users forgo (or do not have a legal obligation of) the provision of running lights and this can constitute a hazard to the vessel itself and surrounding vessels. The provision of an illumination means in accordance with the invention may ameliorate such hazards. Accordingly, there is provided an outboard motor for a small vessel to which there is provided an attachment for the transmission down-shaft cowl or propeller protecting skeg, the attachment including or being adapted to receive an illumination means as herein defined. In a first variant, the skeg has an illumination means integrally formed therewith or securely attached thereto via an engagement surface. In a second variant, there is provide a blade-like structure or foil attachable to the transmission shaft body or down-shaft cowl of an outboard motor. The invention further considers the provision of an outboard or trolling motor with an integral subsurface illumination means directed to provide illumination of potential hazards. Also considered is an electric outboard motor in which the power for the illumination means is taken from the power source of the motor. It will of course be understood that the invention is not limited to the specific details 5 described herein, which are given by way of example only, and that various modifications and alterations are possible within the scope of the appended claims.

Claims

1. An illumination means operably attached to a fin, blade or other applied surface, in which the illumination means comprises a housing secured to said surface and having at one end a light cluster assembly and encapsulating therewithin a battery pack.

2. An illumination means as claimed in Claim 1, in which the housing and surface are integrally formed to present an illuminated fin or skeg.

3. An illumination means as claimed in Claim 1, in which the housing includes an engagement surface adapted to secure the illumination means to said fin, blade or applied surface.

4. An illumination means as claimed in Claim 2 or Claim 3, in which the applied surface comprises a fin or skeg having a retaining portion adapted operationally to engage a retention box on the water craft or vessel to which the fin or skeg is attached in use.

5. An illumination means as claimed in Claim 4, in which the retaining portion is adapted to slidingly engage with the retention box.

6. An illumination means as claimed in any one of Claims 1 to 3, in which the applied surface is adapted to be secured directly to a water sports board, the hull or gunwale of a water craft or to the float or pontoon of a floatplane or seaplane.

7. An illumination means as claimed in any one of the preceding claims, in which the housing comprises a pair of adjacent housing sections.

8. An illumination means as claimed in Claim 7, in which one of the sections of the housing is adapted to provide positive buoyancy to the illumination means.

9. An illumination means as claimed in Claim 7 or Claim 8, in which the engagement surface is disposed between the pair of housing sections and attaches by interference fit to the fin, blade or applied surface.

10. An illumination means as claimed in Claim 9, in which the engagement surface comprises a replaceable insert.

11. An illumination means as claimed in Claim 9 or Claim 10, in which the engagement surface comprises successive textured flexible surface features to provide enhanced grip on the applied surface.

12. An illumination means as claimed in Claim 11, in which the textured flexible surface features of the engagement surface are formed by an additive process, such as 3-D printing.

13. A method of attaching an illumination means of the type claimed in Claim 1 to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or pontoon of a seaplane, the method comprising:presenting a fin or blade-like surface having a mount thereon defining a retaining portion and adapted to be received within a retention box recessed in or affixed to a corresponding surface of the vessel; andfixing the fin mount within the retention box of said vessel, the illumination means being integral to or attached to the fin or blade-like surface.

14. A method of attaching an illumination means as claimed in Claim 13, in which the illumination means is attached to the fin, blade or applied surface via an engagement means which includes successive textured flexible surface features to ensure the illumination means is retained in position during use.

15. A kit of parts for an illumination means suitable for attachment to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or seaplane, the kit comprising:a fin, skeg or blade-like surface having an illumination means integrally formed therewith; anda mount adaptor for interfacing between a retaining portion of the fin, skegor blade-like surface and a retention box of a water sports board or alternative securing receiver of a craft.

16. A kit of parts for an illumination means suitable for attachment to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or seaplane, the kit comprising:an illumination means having a housing which includes an engagement surface adapted to secure the illumination means to a fin, skeg or other applied surface; anda replacement engagement surface.17 A kit of parts as claimed in Claim 16, in which the engagement surface comprises an insert adapted to fit between adjacent housing sections of the illumination means.18 A kit of parts as claimed in Claim 17, in which the replacement engagement surface insert has successive textured flexible surface features (“cilia grip”).

19. A kit of parts as claimed in any one of Claims 15 to 18, in which the kit of parts further comprises any one or more of:a battery pack within a waterproof enclosure;replacement battery cells;charging cable and adaptorreplaceable light cluster assembly;light cluster assembly with integrated camera lens;an attachment means for securing the illumination means to apparatus or to the leg or arm of a swimmer, snorkeler or diver; and-28-body inserts for colour and design variation and / or personalisation.

20. A fin for a water sports board, the fin extending from a mount configured to couple the fin to the board and having an illumination means of the type claimed in Claim 1 secured to or integrally formed with the fin.

21. A fin, blade or other applied surface suitable for attaching to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or pontoon of a seaplane, the fin, blade or applied surface having an illumination means integrally formed therewith, so as to provide improved visibility to and for a user and to provide enhanced hazard perception to a user of said board, vessel or craft:

22. A fin, blade or other applied surface suitable for attaching to a water sports board, hull or gunwale of a water craft or to the float of a floatplane or pontoon of a seaplane, the fin, blade or applied surface having an illumination means attached thereto via an engagement surface comprising successive textured flexible surface features.

23. A water sports board, waterways vessel or craft having secured thereto at least one of the fins, blades or applied surfaces of any one of Claims 20 to 22.

24. A water sports board, hulled vessel or a craft having pontoons or floats thereon on which there is disposed at least one fixing element comprising a retention cavity for receiving a mount of an illumination means of the type claimed in Claim 1, said mount operably retaining a housing having at one end a light cluster assembly and encapsulating a battery pack therein.

25. An attachment means for a swimmer, snorkeller or SCUBA diver, comprising a component, having a fin or blade element, to or through which attachment straps are provided for securing to the body of a user or to the air tank of a SCUBA diver, the fin or blade element operationally having an illumination means of the type claimed in Claim 1 secured thereto to provide enhanced visibility and hazard perception to the user.

26. An outboard motor for a small vessel, to which there is attached an-29-illumination means of the type claimed in Claim 1.

27. An outboard motor as claimed in Claim 26, which includes an attachment for a transmission down-shaft cowl or propellor protecting skeg of the motor, the attachment including or being adapted to receive an illumination means.5        28. A skeg for an outboard motor having an illumination means integrallyformed therewith or securely attached thereto via an engagement surface.

29. A foil or blade-like structure, attachable to or integrally formed with the transmission shaft body or down-shaft cowl of an outboard motor, having an illumination means integrally formed therewith or securely attached thereto via an 10 engagement surface.

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