33 results about "Surfboard fin" patented technology

Provided is a system including a fin box that allows surboard fins to be installed, removed or adjusted to the front or rear of the board within the box and a means for installing the box on the surfboard. More importantly, the fins can be installed in the fin box, and adjusted or removed from the fin box without the use of tools. By using the fin box installation system, manufacturers can effectively locate, align and install the fin box on the surfboard. More importantly, the manufacturers are able to lean and rotate the fins precisely at any desired angles and achieve precise and critical symmetrical mounting of the fins with relation to the centerline of the surfboard.

A protective, removable cover for a surfboard fin. The fin cover may be made of vinyl or other suitable pliable material and conforms to the shape of a standard surfboard fin with a gently rearward curved front edge and a rearward curved rear edge. Formed along the front ad rear edges of the fin cover are small indentations that compress the fi cover against the front and rear edges of the surfboard fin, respectively, to securely hold the fin cover over the fin thereby eliminating the need for adhesives or snaps.

A surfboard fin is fixed when it is used, and removed when it is not used. If the fin is not removed when the fin is not used, it produces an inconvenient state during transportation of the surfboard and the like. However, at present, certain screws are used for its fixing or removing. This work requires much amount of labor and a surfboard playing person feels much inconvenience for this work. The present invention provides a method capable of easily fixing a fin to or removing a fin from a surfboard manually. A rectangular groove is formed at the surfboard, a fitting box is embedded into the groove and fixed with adhesive agent. An inner groove is formed at the central part of the box, the inner groove has two protrusions at right side and two protrusions at left side at the side parts. When the fin is set in the inner groove, the two fitting grooves of respective the right and left sides are provided at the legs of the fin, fitted to the protrusions of the inner groove, whereby the fin is fixed. Fixing or removal of the fin can be carried manually in an easy manner. The fin is not removed during its use, but rigidly fixed.

A display device is provided which may be used to display surfboard fins and related product literature. In one example, a display device includes a plurality of tubes and machined parts which may be assembled and configured as further disclosed herein. Such a display device may be used, for example, to hold and secure surfboard fins to facilitate display of the fins and permit the handling of the fins by consumers. Advantageously, the display device may also be implemented to prevent the fins from being completely detached from the display device without the use of an appropriate security device. The display device may also be implemented to hold and secure information (e.g., product literature) associated with the fins.

The present invention relates to a surfboard fin system which includes a generally horizontal hydrofoil intersecting or connecting with one or more vertical fins. The generally horizontal hydrofoil of the invention is designed using principles of hydrodynamics, that is, the forces generated by the flow of water over a hydrofoil or wing, to create a force that pulls downward on the fin system and, in turn, downward on the tail end of the water planing hull or surfboard.

A retaining structure for a surfboard fin includes a mounting base secured in the undersurface of a surfboard, a fin member and two blocks. The mounting base has a receptacle and two holding portions. The fin member has a connecting section to be embedded in the receptacle of the mounting base and a body section extending from the connecting section. The body section of the fin member protrudes outside the undersurface of the surfboard and has front and rear ends inclined outwardly. Each block is detachably mounted on the respective holding portion of the mounting base and defines a recess in a side according to the slope of the respective inclined end of the body section so that the inclined ends of the body section can be fitted in the recesses of the blocks and suppressed by the blocks and thereby be secured onto the mounting base.

The surfboard fin, in particular, a long surfboard fin has been fixed to or removed from the surfboard under application of a washer and a screw. This operation is quite inconvenient and the fin is removed or fixed when the surfboard is used or is not used, resulting in that the prior art fin has required a quite amount of labor for it. The present invention enables this operation to be carried out manually in an easy manner. The box is fixed to a groove formed at the surfboard with adhesive agent and then the inside part of the box is formed with two grooves standing at different levels. The front long groove is positioned at a slight higher location and one pin of the fin can be inserted into the groove. The rear part pin can be inserted into several L-shaped grooves arranged at a slight lower part of the rear part of the box. The fin has a slight higher front part, has a step and the rear part is positioned at a slight lower location and the front part and the rear part have a total number of two pins each of which is set at the front part and the rear part, respectively. With such an arrangement as above, the fin can be fixed by fitting the two pins into both grooves and the troublesome fixing or removing operation of the fin can be overcome.

[Problem] The present invention relates to a surfboard fin attachment structure. More specifically, the invention addresses the problem of providing a surfboard fin attachment structure, which is capable of detachably attaching a fin to a surfboard, wherein the attachment structure is capable of tight fitting even though easy attachment and detachment are possible and allows fitting without fin shaking or shuddering. [Solution] A surfboard fin attachment structure comprising: pin insertion recesses on both side surfaces of a cavity and, continuous therewith, grooves that continue in the depth direction of the cavity, said grooves extending from a given depth towards the back of the direction of board movement in the longitudinal direction of the fin box; and, on both sides of the fin attachment base, pins corresponding to the pin insertion recesses. The fin is attached by aligning the pins with the pin insertion recesses and inserting the attachment base, and after insertion, moving the fin towards the back of the direction of board movement.

The invention relates to a casting and forming device of a silica gel mould for fins of a surfboard, and belongs to the technical field of surfboard fin processing. The casting and forming device comprises a bottom plate, wherein a forming device and a plastic clay leveling device are arranged on the bottom plate; four baffle plates are arranged in the forming device; the four baffle plates are enclosed to form a rectangle; four slide blocks are further arranged in the forming device; a screw and two guide columns are arranged between each baffle plate and the slide block in front of the outerside of the corresponding baffle plate; a pressure plate, a supporting frame, a pressure rod and four third guide columns are arranged in the plastic clay leveling device; the four third guide columns are separately mounted on four corners of the bottom plate; the uppermost ends of the four third guide columns are co-equipped with the supporting frame; and the pressure plate is further mounted among the four third guide columns. The casting and forming device further solves the problem that working efficiency is affected as a casting framework of an existing surfboard fin silica gel mould iscomplex in dismounting. The casting and forming device further solves the problem that flatness of a mould parting surface of the existing silica gel mould is poor.

In broad embodiment, the present invention is a removable surfboard fin adapter that allows removable fins, fin boxes and fin systems from different manufacturers to be compatible with each other. The present invention is a device used to enable a two-tabbed type removable surfboard fin to be received and secured in the recess of a single-tab type surfboard fin receiving box that, without said device, would not be able to receive and secure a two-tabbed type removable surfboard fin. The present invention solves a common problem for surfboard owners who own multiple surfboards, which contain removable fin systems from the two most common removable fin system manufacturers. It is a disadvantage for the surfboard owner in situations like this because the surfboard owner must purchase multiple sets of fins for each respective removable fin system and bring multiple sets of fins for each removable fin system when traveling.

The invention relates to a manufacturing device for a silica gel mold of a surfboard fin, belonging to the technical field of processing of surfboard fins. The manufacturing device comprises a base plate which is provided with a molding unit, a pouring unit and a plasticine leveling unit, wherein four baffle plates are arranged in the molding unit and define into a rectangular shape; four slidersare arranged in the molding unit; a screw and two guide columns are arranged between each baffle plate and a slider located right ahead of the outer side of the same baffle plate; a press plate, a supporting frame, a press rod and four third guide columns are arranged in the plasticine leveling unit; and feed drum supporting frames, a feed drum, a stirring blade and stirring blade fixing supportsare arranged in the pouring unit. The manufacturing device provided by the invention solves the problem of large occupied space for storage of a pouring frame of the silica gel mold of the surfboard fin, the problem of poor flatness of the silica gel mold manufactured in the prior art, and the problem of difficult cleaning of residual bubbles in the silica gel mold and residual silica gel solidified on the wall of a silica gel filled container.

A surfboard fin has a curved forward fin portion and a straight rearward fin portion. When attached to a surfboard, the curved forward portion is positioned on the surfboard so the curvature of the forward portion is directed toward the centerline of the surfboard. The concave curve of the forward portion allows for faster and easier maneuverability of a surfboard while in use. In order to reduce drag caused by the curvature of the forward fin portion, one or more through holes may be formed through the forward fin portion to allow water to pass through the fin and reduce drag.

The invention relates to the technical field of surfboard fins, in particular to a surfboard fin and a manufacturing technology thereof. The manufacturing technology comprises the following steps of A, cutting a calico, a honeycomb screen cloth and glass into the shape of a fin; B, opening a mold, sequentially laying the cut glass, the cut calico, the cut honeycomb screen cloth into the mold, arranging a plurality of convex blocks on the inner side face of the top of the mold, and closing and screwing down the mold; C, injecting resin into the mold, baking and forming the resin, and conducting cooling to obtain a fin, wherein a plurality of grooves are formed in one side of the fin; D, opening the mold, taking out the formed and cooled fin, and sanding and polishing the fin to obtain the surfboard fin. The obtained surfboard fin is low in cost, easy and convenient to use, low in weight, high in buoyancy force and capable of reducing resistance, improving lift force and improving the whole performance.

The invention relates a silastic mould casting framework of surfboard fins and belongs to the technical field of surfboard fins processing. The silastic mould casting framework of surfboard fins comprises a base.The base plate is provided with four baffles, and the four baffles are formed in the rectangular shape. Four sliding blocks are arranged on the base plate, and each sliding block is correspondingly located in the front of the outside of the four baffles.Screw rods and two guide pillars are arranged between each baffle and the front of the outside of the sliding blocks.The silastic mould casting framework of surfboard fins solves the problem of the existing silastic mould casting frameworks of the surfboard fins with large quantity, large storage space and inconvenient management. The silastic mould casting framework of surfboard fins also solves the problem that the work efficiency is affected by the tedious disassembly and assembly of the existing silastic mould casting frameworks of the surfboard fins.

A watercraft fin removal tool for facilitating the removal of a detachable fin coupled to a watercraft body. The tool comprises an elongate body having a fin engagement head at one end and a handle at an opposing end. In use, the head is configured to engage the fin such that a sufficient leverage force may be applied to the fin by the user at the head via the handle to detach the fin from the watercraft body. In the preferred embodiment, the tool is designed for the removal of detachable surfboard fins. But, it may also be configured to remove fins from other watercrafts, such as wakeboards, paddleboards and the like.