Self-engaging watercraft trailer latching assembly

Abstract

A self-engaging watercraft trailer latching assembly is disclosed. The assembly includes a prow-mounted catch having a leading angled edge and a trailing edge forming a hook portion, and a trailer-mounted keeper mechanism comprising a housing with an internal spring biasing mechanism and a U-shaped latch. During landing, as the watercraft advances, the catch deflects the latch until an engagement bar passes beneath the hook portion, whereupon the biasing mechanism returns the bar into abutment with the trailing edge to secure the craft automatically. For launching, a tensioning member such as a bungee cord or spring may be coupled to the housing, applying a downward force that pivots the latch into a released position once the vessel is driven slightly forward, thereby allowing single-operator automatic unlatching as the craft reverses off the trailer. The compact housing protects internal components, tolerates skewed approaches, and enables retrofit to existing trailers.

Description

Self-Engaging Watercraft Trailer Latching AssemblyField of the Invention

[0001] The present disclosure relates to trailer couplings for watercraft. More particularly, it concerns latching assemblies configured to secure a personal watercraft such as a jet ski or small boat to a trailer during docking, transport and launching operations.Background of the Invention

[0002] The docking, loading, and securement of personal watercraft onto trailers presents significant practical challenges, particularly at boat ramps where alignment, current, wind, and operator control may be unpredictable. These conditions can make it difficult to guide the prow of a watercraft into reliable engagement with a trailermounted securing device, often requiring repeated attempts or manual intervention.

[0003] Numerous solutions have been proposed to address these difficulties, ranging from roller-based arrangements intended to accommodate prow movement, to keeper mechanisms employing camming or pivoting elements, and to reinforced prow fittings designed to withstand winching and towing loads.

[0004] For example, Australian application AU 2013100979 A4 (Pomper John Robert), published 15 August 2013, discloses a latching system in which the principal securing element is a roller biased by a spring. The roller is designed to rotate and deflect as the watercraft advances, before settling beneath a protruding tongue of a prowmounted fitting. The emphasis of this arrangement is on the rolling action of the keeper, which accommodates the prow structure but provides relatively localised contact between the roller surface and the tongue.

[0005] United States patent US 4,641 ,851 (Knies Rudy D), published 10 February 1987, describes a different style of mechanism in which a trailer-mounted keeper cooperates with a prow-mounted catch having curved guiding surfaces. The device operates through the interaction of arcuate edges and a pivoting keeper, producing a camming effect as the boat moves forward.

[0006] International application WO 2020 / 229765 A1 (Gerard Damien), published 19 November 2020, discloses a prow fitting incorporating a reinforced plate and an integrated winch aperture. The disclosure emphasises structural reinforcement and the ability to attach a winch directly to the prow fitting. Engagement with a trailermounted latch occurs through this reinforced prow component, which is primarily designed for winching and towing loads in addition to docking.

[0007] United States application US 2008 / 0265543 A1 (Davis Geoffrey Calton et al.), published 30 October 2008, discloses a trailer latch in which the principal securing element is a hook having a neck portion and a laterally projecting head. The head is shaped with flared extensions on either side of the neck, producing an irregular and somewhat bulky profile. Engagement occurs when a snare loop attached to the bow of a watercraft is driven into contact with a forward edge of the head. This interaction causes the hook to pivot sideways about a trailer-mounted body, displacing the neck until the loop settles into a notch formed in the hook. The device employs a lever connected to the same pivot as the hook, with an over-centre spring arrangement that maintains the hook in either a capture or a release position. The lever rotates laterally from one side of the latch body to the other, altering the position of the hook accordingly. Because the hook head projects outwardly on both sides and presents angular edges, the arrangement exposes sharp surfaces which may pose handling difficulties. The sideways pivoting action of the head and lever introduces a level of mechanical fragility, relying on precise alignment of the snare loop with the notch in the neck. The combination of the complex head geometry and the external lever means that both moving parts and sharp metal edges remain exposed during operation.

[0008] The present invention seeks to provide a way, which will overcome or substantially ameliorate at least some of the deficiencies of the prior art, or to at least provide an alternative.

[0009] It is to be understood that, if any prior art information is referred to herein, such reference does not constitute an admission that the information forms part of the common general knowledge in the art, in Australia or any other country.Summary of the Disclosure

[0010] According to one aspect, there is provided a self-engaging watercraft trailer latching assembly comprising a catch assembly configured for attachment to a prow of a watercraft and a keeper mechanism configured for attachment to a trailer. The catch assembly defines a leading angled edge and a trailing edge forming a hook portion. The keeper mechanism comprises a mounting bracket affixable to the trailer, a pivoting latch assembly supported by the bracket, a housing enclosing a spring biasing mechanism, and a generally U-shaped latch having proximal ends retained within the housing, opposed side arms extending forwardly beyond the housing, and a transverse engagement bar interconnecting the side arms. The spring biasing mechanism urges the latch assembly toward an engaging position in which, as the watercraft advances, the engagement bar initially contacts the leading angled edge of the catch assembly, is deflected to a released position, and then passes beneath the hook portion to rise into abutment with the trailing edge in a latched position, thereby securing the watercraft to the trailer.

[0011] This configuration achieves several practical and technical advantages. The uniform profile of the U-shaped latch arms and engagement bar allows reliable capture of the catch assembly even when the watercraft approaches at an angle, overcoming the alignment difficulties that frequently occur at boat ramps. The enclosure of the biasing mechanism within a compact housing shields vulnerable parts from impact and corrosion, while also minimising bulk and maintaining a streamlined form that can be readily integrated with existing trailers. The design is robust in construction, employing pressed-metal components that withstand the significant forces encountered during towing and winching, and thereby ensuring durability in demanding marine conditions. In addition, the assembly is readily retrofittable to existing trailers and watercraft without requiring extensive hull or frame modification. Overall, the device provides a compact, robust, and straightforward solution that delivers a more tolerant and safer docking and launching process for single operators.

[0012] By contrast, earlier approaches have relied on less versatile arrangements. Pomper discloses a roller-type keeper engaging across a narrow localised surface. Knies employs curved prow surfaces and camming actions that are highly sensitive to shape and alignment. Gerard emphasises reinforced prow fittings intended for winching loads, but requiring substantial hull modification. Davis presents externally mounted latch arms with exposed biasing elements prone to impact damage. Each of these solutions has limitations that the present assembly overcomes through its simplified latch geometry, compact housing, and self-engaging operation.

[0013] The catch assembly may be secured to the prow of a watercraft by means of a flat base plate having apertures formed at opposite ends to receive bolts or equivalent fasteners. Such a configuration allows the assembly to be fitted directly against the hull surface with minimal modification.

[0014] In another practical arrangement, the catch assembly can instead employ threaded stems extending from the base plate, which pass through apertures in the prow and are anchored internally with a retainer plate and nuts. This provides a through-hull fastening option that enhances strength, particularly for fibreglass hulls where surface-mounted fasteners alone may be insufficient.

[0015] The hitch plate of the catch assembly may be formed with a leading angled edge and a trailing edge which together define a downwardly directed hook portion. The angled edge provides a camming surface that guides the keeper element downward during entry, while the trailing edge functions as an abutment against which the keeper secures.

[0016] In some forms, the hitch plate further incorporates two apertures serving distinct purposes. A major aperture can be dimensioned to receive a winch hook for drawing the watercraft onto the trailer, while a smaller aperture is adapted to accommodate the threaded pin of a D-latch connected to a safety chain. This two- aperture arrangement enables both the winch and a safety chain to be attached in sequence without requiring the winch line to be prematurely released, thereby improving operational safety at the ramp.

[0017] The mounting bracket of the keeper mechanism may include a base plate with a matrix of preformed apertures, enabling flexibility in attachment to different trailer configurations. By providing multiple fastener positions, the bracket can be easily adapted to various trailer geometries and retrofitted without custom fabrication.

[0018] The housing may be formed from sheet metal bent and welded to define side walls, a top wall and an end wall. Such a construction provides a compact enclosure that not only supports the pivoting mechanism but also protects internal parts from physical damage and corrosion. In some embodiments, the housing is shaped with a widened proximal portion which accommodates the pivot axle, and a narrower forward projecting portion which receives the ends of the latch, providing both mechanical strength and efficient material use.

[0019] The biasing mechanism can conveniently be provided by a pair of torsion springs wound around the common axle of the latch assembly. By acting directly on the axle, these torsion springs deliver consistent rotational bias while being contained within the housing for protection, giving the assembly durability in the marine environment.

[0020] The proximal ends of the U-shaped latch may be straight segments which are welded into internal corners of the forward projecting portion of the housing. Welding the latch in this way secures the rod in an elongate seat, ensuring the slender latch is firmly anchored against heavy loading encountered during winching or transport.

[0021] The latch itself extends forwardly from the housing in the form of opposed side arms connected at their distal ends by a transverse engagement bar. The uniformity of cross-section between the side arms and the engagement bar enables smooth entry of the prow fitting, whether or not perfect alignment is achieved, thereby tolerating skew approaches of the watercraft without jamming.

[0022] In some versions, the side arms are spaced apart more widely than the housing itself, achieved by outwardly splayed transitions between the proximal ends and the forward arms. This results in a latch interior broader than the housing, which increases the capture envelope for the prow fitting and improves the probability of reliable engagement even where the approach angle is oblique.

[0023] Provision may also be made for a release mechanism to allow the latch to be selectively disengaged. One convenient approach involves a set screw threadably received in nuts fixed to the front wall of the housing, the screw being advanceable so that its distal tip bears against the base plate of the mounting bracket. Rotation of the screw applies leverage forward of the pivot axis, forcing the latch assembly into a released position in which the engagement bar is clear of the prow fitting.

[0024] The set screw can terminate in a head formed with a hexagonal socket or equivalent tool-engaging profile, enabling manual actuation by an Allen key, screwdriver or other common hand tool. This allows an operator to reliably set the latch in the released condition when preparing to launch a watercraft, and to reset it to the latched condition once the craft has been deployed.

[0025] Other aspects of the invention are also disclosed.Brief Description of the Drawings

[0026] Notwithstanding any other forms which may fall within the scope of the present invention, preferred embodiments of the disclosure will now be described, by way of example only, with reference to the accompanying drawings in which:

[0027] Figure 1 is an exploded perspective view of a latching assembly according to an embodiment.

[0028] Figure 2 is a perspective view of the latching assembly in an assembled state.

[0029] Figure 3 is a side view showing the latch assembly in an initial engaging position.

[0030] Figure 4 is a side view showing contact between the engagement bar and the leading angled edge of the catch.

[0031] Figure 5 is a side view showing the latch assembly deflected as the engagement bar passes beneath the hook portion.

[0032] Figure 6 is a side view showing the latch assembly returned to a latched position.

[0033] Figure 7 is a perspective view showing an alternative form of catch assembly.Description of Embodiments

[0034] Figure 2 illustrates a perspective view of a self-engaging watercraft trailer latching assembly 100 in accordance with an embodiment, while Figure 1 shows an exploded representation of the assembly 100.

[0035] The assembly 100 comprises a catch assembly 101 configured for attachment to the prow of a personal watercraft, such as a jet ski, runabout, or small speedboat. In the embodiment depicted in Figure 1 , the catch assembly 101 is of a simplified yet robust construction, comprising a base plate 102 arranged to sit flush against the hull surface of the watercraft. The base plate 102 may include apertures for fasteners at opposite ends to secure the catch to the hull, and projects an orthogonally extending hitch plate 104. In an alternative embodiment shown in Figure 7, the base plate 102 is relatively smaller compared with the hitch plate 104 and comprises a pair of threaded stems 105 adapted to pass through corresponding apertures in the prow. These stems may be secured internally by a retainer plate fastened with nuts, thereby clamping the catch assembly 101 securely to the hull.

[0036] The catch assembly 101 as shown in Figure 1 is particularly suited for retrofit to Yamaha personal watercraft, replacing the factory prow fitting supplied with such models, whereas the alternative embodiment of Figure 7, employing threaded stems105 and an internal retainer plate, is especially applicable to Kawasaki and Seadoo watercraft. In each case the assemblies are dimensioned to substitute directly for existing fittings, enabling straightforward upgrade without substantial hull modification

[0037] With reference to Figure 3, the hitch plate 104 defines a leading angled edge106 and a trailing edge 107 which together form a downwardly directed hook portion 108. The angled edge 106 provides a camming surface, while the trailing edge 107 acts as a latching abutment.

[0038] The assembly 100 further comprises a keeper mechanism 109 configured for affixation to a trailer. The keeper mechanism 109 includes a mounting bracket 110 having a base plate 111 and opposed side flanges 112. The base plate 111 mayinclude a matrix of preformed fastener apertures 113 to facilitate attachment to the trailer frame using bolts or equivalent fasteners.

[0039] The keeper mechanism 109 further comprises a pivoting latch assembly 114 including a housing 115. The housing 115 has side walls 116 pivotally connected to the side flanges 112 via a common axle 117. In preferred embodiments the side flanges 112 are protectively enclosed within the housing 115 to shield them from impact, water ingress, and corrosion. The housing 115 may be fabricated from pressed or folded sheet metal to define a top wall 126, an end wall 118, and the side walls 116. The edges of these walls may be welded together to form a robust enclosure. The housing 115 may be shaped with a relatively wider proximal portion 119 for engaging the axle 117 and a forward projecting portion 120 which receives a latch as described below.

[0040] Within the housing 115 there is enclosed a spring biasing mechanism 121 acting between the housing 115 and the mounting bracket 110. In the preferred embodiment the biasing mechanism comprises a pair of torsion springs 122 wound around the common axle 117. The torsion springs 122 bias their free ends 123 apart, thereby applying torque which urges the housing 115 to rotate anticlockwise relative to the mounting bracket in the orientation of Figure 1. This rotation raises the keeper mechanism 109 into engagement with the catch assembly 101.

[0041] The pivoting latch assembly 114 further comprises a generally U-shaped latch 124. The latch 124 has a pair of proximal ends 125 which are retained within the forward projecting portion 120 of the housing. The proximal ends may be straight and welded securely within internal corners defined between the top wall 126 and the side walls 116. From the proximal ends 125 extend opposed side arms 127 which project forwardly beyond the housing. The side arms 127 are joined at their distal ends by a transverse engagement bar 128 extending substantially orthogonal to the pivot axis 129 defined by the common axle 117. The side arms 127 preferably have substantially the same cross-sectional width as the engagement bar 128, thereby presenting a uniform profile.

[0042] Figures 3 to 6 illustrate the operational sequence of engagement between the catch assembly 101 and the keeper mechanism 109. In the rest position, shown in Figure 3, the spring biasing mechanism 121 urges the pivoting latch assembly 114 into an engaging position. As the watercraft is propelled onto a semi-submerged trailer, the prow-mounted catch assembly 101 advances towards the keeper mechanism 109. As shown in Figure 4, the engagement bar 128 of the latch 124 first contacts the leading angled edge 106 of the hitch plate 104. This camming interaction forces the pivoting latch assembly 114 to deflect to a released position against the bias of the torsion springs. As the watercraft advances further, the engagement bar 128 passes beneath the hook portion 108 as shown in Figure 5. The torsion springs 122 then return the latch assembly toward the engaging position, raising the latch 124 so that the engagement bar 128 moves into abutment with the trailing edge 107, as illustrated in Figure 6. This secures the catch assembly 101 to the keeper mechanism 109 in a latched condition.

[0043] This arrangement provides several technical advantages. The assembly 100 is relatively compact, robust, and simple to manufacture. Both the catch assembly and keeper mechanism can be retrofitted to existing trailers and watercraft without requiring substantial modification to the hull or frame. The protective housing 115 shields the relatively fragile side flanges 112 and the internal biasing mechanism 121 from impact, wear, and environmental exposure, thereby enhancing service life. The orthogonally oriented engagement bar 128 enables direct, reliable latching when the watercraft and trailer are in close alignment. At the same time, the uniform cross- sectional width of the side arms 127 and the engagement bar 128 ensures that even when the components approach at a skewed or non-aligned angle, the catch assembly 101 can still slide over the latch arms 127 and achieve secure capture. This significantly improves docking tolerance at boat ramps where precise alignment is often difficult. Moreover, the pressed-metal construction of the housing 115 allows it to withstand the high forces exerted on the common axle 117 during engagement, while the forward projecting portion 120 provides a reinforced seat for the proximalends 125 of the latch 124. This ensures the relatively thinner latch is securely anchored, preventing deformation under towing loads.

[0044] The housing 115 may define side edges 130 at the junction between the top wall 126 and side walls 116. Preferably, the side arms 127 project outwardly beyond these edges 130 by way of transitions 131 between the proximal ends 125 and the side arms 127. This results in a latch interior 132 that is wider than the housing 115, thereby increasing the likelihood of capture despite misalignment between the catch assembly 101 and the keeper mechanism 109.

[0045] The pivoting latch assembly 114 may further comprise an adjustment mechanism to vary its resting angle relative to the mounting bracket 110, thereby assisting correct engagement of the catch assembly 101 under different trailer geometries or approach conditions. In the embodiment shown, the adjustment mechanism is provided by a set screw 133 threadably engaged with one or more nuts 135 secured to the front wall 118 of the housing 115. The set screw 133 has a distal end 134 arranged to bear against the base plate 111 of the mounting bracket 110, and a head 136 shaped with a hex socket or other tool-engaging profile. By turning the set screw 133, the operator can adjust the angular disposition of the housing 115 about the pivot axis 129, ensuring that the engagement bar 128 is appropriately positioned for reliable capture of the hook portion 108. This adjustment can be performed with common hand tools and allows fine-tuning of the latching performance without disassembly of the assembly 100..

[0046] In another arrangement, the latch assembly 114 may incorporate an automatic release feature permitting single-operator launching. For this purpose, the housing 115 can be formed with a fastener aperture 138 positioned to receive a tensioning member (not shown) such as a bungee cord, coil spring, or equivalent elastic element. The tensioning member extends from the fastener aperture 138 to a fixed point on the trailer frame, applying a downward force to the housing 115. During landing operations, this tensioning member is disconnected so that the torsion springs 122 bias the latch assembly 114 into the engaging position shown in Figure 3. During launching, the tensioning member may be connected however, the operator can drivethe vessel forward slightly so that the engagement bar 128 is freed from the hook portion 108. At that moment, the tensioning member overcomes the counterforce of the torsion springs 122, rotating the housing 115 downward and maintaining it in a released position. The vessel may then be reversed off the trailer, with the catch assembly 101 moving clear of the keeper mechanism 109 while the tensioning member holds the latch assembly disengaged. This arrangement enables a selflaunching capability without manual operation of the latch, and once the vessel has departed, the tensioning member can be disconnected to restore the latch assembly to its self-engaging configuration.

[0047] The hitch plate 104 may further comprise retention apertures, preferably provided as a pair of apertures 137 including a major aperture 137A and a minor aperture 137B. The major aperture 137A is dimensioned to receive the hook of a winch line, enabling the watercraft to be drawn securely onto the trailer during landing operations. The minor aperture 137B is dimensioned to receive the threaded pin or set screw of a D-latch connected to a retention chain. This arrangement allows the operator to attach a secondary safety chain to the watercraft while the winch line remains engaged, thereby maintaining securement at all times. Once the chain is attached through the minor aperture 137B, the winch line can be safely released from the major aperture 137A without risk of the watercraft rolling backwards or becoming unstable. This dual-aperture configuration therefore provides a practical safety sequence, reduces handling complexity at the boat ramp, and ensures compliance with transport requirements mandating the use of independent mechanical restraints in addition to the winch line.

[0048] In an embodiment, the housing 115, mounting bracket 110 and catch 101 are 4 mm thick 316 stainless steel pieces.

[0049] In a non-limiting exemplary method of use according to the preferred embodiment shown, the latching assembly 100 facilitates both landing and launching operations for a personal watercraft in a manner that can be performed by a single operator

[0050] For landing, the trailer bearing the keeper mechanism 109 is partially submerged at a boat ramp. The personal watercraft is then propelled forward so that the prow fitted with the catch assembly 101 approaches the keeper mechanism 109. As the watercraft advances, the engagement bar 128 of the latch 124 first contacts the leading angled edge 106 of the hitch plate 104, as described previously with reference to Figure 4. Continued forward motion of the watercraft forces the pivoting latch assembly 114 to rotate against the action of the torsion springs 122, allowing the engagement bar 128 to pass beneath the hook portion 108 of the hitch plate 104. When the engagement bar 128 clears the hook portion 108, the torsion springs 122 return the pivoting latch assembly 114 toward the engaging position, causing the engagement bar 128 to rise into abutment with the trailing edge 107 as shown in Figure 6. In this latched position, the catch assembly 101 is secured to the keeper mechanism 109, thereby restraining the watercraft on the trailer. The operator may then attach a winch line through the major aperture 137A of the hitch plate 104 and, if desired, secure a safety chain via a D-latch connected through the minor aperture 137B. This sequence allows safe transition from waterborne to land transport.

[0051] For single-operator launching, the operator connects a tensioning member such as a bungee cord or coil spring between the fastener aperture 138 of the housing 115 and a fixed point on the trailer frame. The watercraft is then driven slightly forward, releasing the engagement bar 128 clear of the hook portion 108. At that moment, the tensioning member overcomes the counterforce of the torsion springs 122 and pivots the housing 115 downward, maintaining the engagement bar 128 in a released position without further manual intervention. The watercraft can then be reversed smoothly off the trailer while the tensioning member holds the latch assembly clear of the catch.

[0052] This exemplary method demonstrates that the assembly 100 provides a selfengaging, automatically biased latching action during landing, and a controlled, single-operator release procedure during launching. The optional use of the tensioning member enables a self-launching capability in which the latch automatically remains disengaged once the catch has been driven forward, reducingthe risk of uncontrolled movement and eliminating the need for manual handling of the latch at the ramp. The arrangement simplifies operation under varying conditions of current, wind, or alignment and provides safe, repeatable handling of the watercraft during both landing and launching.

[0053] The foregoing description, for purposes of explanation, used specific nomenclature to provide a thorough understanding of the invention. However, it will be apparent to one skilled in the art that specific details are not required in order to practise the invention. Thus, the foregoing descriptions of specific embodiments of the invention are presented for purposes of illustration and description. They are not intended to be exhaustive or to limit the invention to the precise forms disclosed as obviously many modifications and variations are possible in view of the above teachings. The embodiments were chosen and described in order to best explain the principles of the invention and its practical applications, thereby enabling others skilled in the art to best utilize the invention and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the following claims and their equivalents define the scope of the invention.

Claims

Claims1. A self-engaging watercraft trailer latching assembly comprising: a catch assembly configured for attachment to a prow of a watercraft, the catch assembly having a leading angled edge and a trailing edge defining a downwardly directed hook portion; a keeper mechanism comprising: a mounting bracket configured for affixation to a trailer, the mounting bracket including a base plate and opposed side flanges; a pivoting latch assembly including: a housing having side walls pivotally mounted to the side flanges about a common axle, the housing enclosing a spring biasing mechanism operative between the housing and the mounting bracket; and a generally U-shaped latch having a pair of proximal ends retained within a forward projecting portion of the housing, a pair of opposed side arms extending forwardly from the proximal ends beyond the housing, and a transverse engagement bar interconnecting the side arms at a distal end of the latch, the engagement bar extending generally orthogonal to a pivot axis defined by the common axle and the side arms defining substantially the same cross-sectional width as the engagement bar, wherein, in use: the spring biasing mechanism urges the pivoting latch assembly toward an engaging position, such that on approach of the watercraft the transverse engagement bar initially contacts the leading angled edge of the catch assembly and is deflected to a released position, until the engagement bar passes beneath the hook portion and is then raised by the biasing mechanism into abutment with the trailing edge in a latched position, thereby securing the catch assembly to the keeper mechanism.

2. The assembly of claim 1 , wherein the catch assembly includes a base plate having apertures for receiving fasteners to secure the catch assembly to a prow of a watercraft.

3. The assembly of claim 1 , wherein the catch assembly includes a base plate having threaded stems adapted to pass through apertures in the prow of the watercraft and to be secured internally by a retainer plate.

4. The assembly of claim 1 , wherein the catch assembly includes a hitch plate defining the leading angled edge and the trailing edge together forming a downwardly directed hook portion.

5. The assembly of claim 4, wherein the hitch plate further comprises a major aperture dimensioned to receive a winch hook and a minor aperture dimensioned to receive a D-latch of a retention chain.

6. The assembly of claim 1 , wherein the mounting bracket comprises a base plate having a plurality of preformed fastener apertures for attachment to a trailer.

7. The assembly of claim 1 , wherein the housing has a top wall, side walls, and an end wall joined together to form an enclosure.

8. The assembly of claim 1 , wherein the housing comprises a proximal portion for engaging the axle which is relatively wider than the forward projecting portion.

9. The assembly of claim 1 , wherein the spring biasing mechanism comprises a pair of torsion springs wound about the axle and acting between the housing and the mounting bracket.

10. The assembly of claim 1 , wherein the proximal ends of the latch are welded within internal corners of the housing.11 . The assembly of claim 1 , wherein the side arms of the latch extend outwardly beyond lateral edges of the housing to define a latch interior wider than the housing, thereby increasing the capture envelope for engagement with the catch assembly.

12. The assembly of claim 1 , wherein the proximal ends of the latch are welded into internal corner regions of the housing to provide reinforced anchoring against loading forces during towing and winching.

13. The assembly of claim 7, wherein the housing is formed from pressed or folded sheet metal to define the top wall, side walls and the end wall.

14. The assembly of claim 1 , wherein the pivoting latch assembly further comprises an adjustment mechanism including a set screw threadably engaged with the housing and arranged to bear against the mounting bracket to vary the resting angle of the housing relative to the mounting bracket.

15. The assembly of claim 14, wherein the set screw has a head defining a toolengaging profile exposed from the housing and permitting manual angular adjustment with a hand tool.

16. The assembly of claim 1 , further comprising a tensioning member extending to a trailer frame so as to apply a downward force on the housing.

17. The assembly of claim 16, wherein the tensioning member overcomes the spring biasing mechanism to bias the housing to the released position when the catch assembly is displaced forward relative to the keeper mechanism.

18. A method of launching a personal watercraft using the assembly of claim 16, comprising driving the watercraft forward so that an engagement bar of the latch clears a hook portion of the catch assembly, whereupon the tensioning member pivots the housing into a released position and maintains it in the released position as the watercraft is reversed off the trailer.

19. A method of securing a personal watercraft to a trailer using the assembly of claim 1 , comprising propelling the watercraft onto a semi-submerged trailer to cause the catch assembly to contact the keeper mechanism, thereby deflecting the pivoting latch assembly against the bias of the spring biasing mechanism, such that an engagement bar of the latch passes beneath a hook portion of the catch assembly and the biasing mechanism thereafter returns the latch assembly so that the engagement bar rises into abutment with a trailing edge of the catch assembly in a latched position.

20. The method of claim 19, further comprising attaching a winch hook to a major aperture in the hitch plate to draw the watercraft fully onto the trailer.

21. The method of claim 19, further comprising attaching a retention chain via a D- latch through a minor aperture in the hitch plate, while the winch hook remains engaged.

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