CS206828B1 - Manufacturing process of canoe and kayak paddles - Google Patents

Description

The invention relates to a process for the manufacture of canoe paddles and kayak paddles from polymer-forming compounds.

The paddles are made of wood and the reason for this is the good workability of this traditional material, its specific weight and favorable strength properties. However, the manufacturing processes are laborious, are associated with a significant proportion of manual labor, or? during production it is necessary to keep framed shape profiles of paddles, which is difficult especially when creating irregular surfaces of kayak paddle blades. In addition to the described machining of glued wood blocks, there is also a method for producing paddles based on gluing weak wood veneers in molds under pressure with additional sticking of the sheets thus obtained on the shaft. Thus it is possible to ensure profile staadartnosť production, but the joints of the leaves and the shaft do not show satisfactory strength and thus

create desirable collapse of the leaf area.

We have now found a method for producing canoe paddles and kayak paddles which, according to the present invention, consists in applying liquid polymeric components, optionally colored, to the entire surface of two mold parts formed into the upper or lower surface of the paddle sheet and resulting in semi-cylindrical sleeves. , intended to form the blade end for connection with the paddle shaft and the applied layers are interleaved with reinforcement, whereupon both parts of the mold are placed together, possibly with the shaft inserted between the half-cylindrical sleeves, and enclosed

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parts of the feint are pushed together, the polyaerizaoo jumps down or, in case of additional joining of the sheet with the hollow shaft, the modified end of the sheet is provided with a binder and inserted into the hollow shaft, eventually the same provided with a binder.

Compared to the processes that have been made to date for some single-shell utility articles made of plastics, the new process for producing paddles differs in principle in that the double-shell blades are made in a two-piece mold of two layered portions. It is precisely this technological procedure that allows the simple formation of longitudinal cavities within the paddle blades and these cavities assume the function of the reinforcing box beams without which the paddles would not exhibit sufficient rigidity. The formation of cavities in the paddle leaves reduces their weight, which is favorable.

Thus, the method of producing canoe-like paddles of the present invention, compared to the prior art methods, has a number of advantages, such as being incomparably rational, making it possible to create intricately profiled paddles without increasing manufacturing effort and cost and sari paddles produced in the same shape. compliance with the standard can be easily achieved, which also leads to a reduction in scrap. Production can be carried out by an unqualified worker, and sports equipment of excellent parameters such as strength, low weight, water resistance, durability, and a smooth and glossy surface emanating from the factory are easily and inexpensively produced, eliminating the need for demanding, additional finishes * Even labor productivity is considerably higher than in the production of wooden paddles, and production is virtually waste-free.

In the new process, the entire surface of the two mold parts molded both on the top surface and the bottom surface, previously treated with one of the known anti-sticking agents, is applied - by coating, spraying, pouring and spreading and the like ratios prescribed by the manufacturer, optionally colored, in several layers, the layers being interleaved with the selected reinforcement. Immediately thereafter, the two mold parts with the corrugated material are brought together,

In cases where the connection to the shaft is made by embedding it in the sheet, a gantry can be inserted between the half-cylindrical sleeves together with the joining of the two parts of the sheet, the enclosed mold part squeezed together and the polymorlsaeo run. The sheets can be connected to the poles additionally, so that the end of the produced sheet, formed in the sleeves, is modified to λ

of a suitable diameter, provide a bonding agent and insert it into a hollow shaft which is optionally provided with a bonding agent at the joint. As a binder, adhesives, polymorphic compounds, sealants, resins and the like can serve. the shafts may be of wood, metal or plastic, solid or hollow and of varying length. In manufacture, it is necessary that the joining of both parts of the paddle sheet occurs before the polymorphism of the components, otherwise the desired bond strength is not achieved.

For the performance of a hydromechanical paddle in sports performance, it is advantageous for the blade engagement sheet to be provided with a longitudinal rib preventing the blade from transversely vibrating when engaged in water. In order to increase the longitudinal stiffness of the paddle blade, it is advantageous that the nibbing surface of the blade is also reinforced with a substantially arched reinforcement; both bulges.

they form a hollow beam in the paddle blade and significantly contribute to the eolk strength of the product. This demanding shaping of sheet metal sheets is readily accomplished in production due to the invention of the nail in an appropriately modeled phenomenon with the lamination of polyaoretvexmultiple components and reinforcements to obtain both light and complex tubs in a series of identical sheets. The resulting cavities can optionally be filled with light porous materials such as foamed polymers, which can be used to prevent potential intrusion of the cavity.

In the method of the invention the paddle paddles of the invention can be used in the known pelymesvertiary components, which by pelymerization form destabilized solid plastic layers such as polyesters, polyamides, polyacrylates, epoxy resins and the like; conventional reinforcements such as staple fibers and fabrics of fiber-forming polymers or glass or metal fibers and the like by which the applied spindles are interleaved can be used to reinforce the polymer layers.

Claims (1)

. Method for producing canestic and kayak paddles, characterized in that the liquid pelymer-forming components, optionally colored, are applied to the entire surface of two parts of the darkness, forming the upper and lower sheets of the paddle blade and leading to the sleeve, respectively. of the skewers and the paddles, and the layers to be deposited are reinforced, until the two parts of the mold are joined together or, if necessary, seufeg. The half-cylindrical sleeve and half-cylindrical sleeves and the enclosed parts of the fermet are pressed together, allowing the pelymerisaee to run over and, in the case of subsequent joining of the leaves to the hollow shaft, the modified end of the blade is provided with binder.