Fishing Rod Body Torsional Rigidity via Opposite Winding
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Solution Overview
Problem
Current fishing rod designs with prepreg tapes wound in the same direction for both inner and outer layers lack sufficient torsional rigidity, especially when subjected to torsional forces from opposite directions, and face challenges in workability and strength when dealing with fish movements.
Innovation Solution
The design involves winding prepreg sheets and tapes in opposite directions to create a configuration where reinforcing fibers cross each other radially, enhancing torsional rigidity and strength, with the prepreg sheet acting as an inner layer and prepreg tape forming an outer layer, and optionally adding an intermediate prepreg sheet for increased bonding and rigidity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If prepreg tapes are wound in the same direction for both inner and outer layers, then the manufacturing process is simple, but the torsional rigidity is insufficient when subjected to torsional forces from opposite directions
Solution Approach 1:
The patent applies inversion by winding the inner layer prepreg tape in a right-handed direction and the outer layer prepreg tape in a left-handed direction (opposite directions). This causes the reinforcing fibers to cross each other radially, enabling the structure to resist torsional forces from both left-handed and right-handed directions equally, thereby solving the problem of insufficient torsional rigidity while maintaining manufacturing simplicity
Solution Approach 2:
The patent creates a composite structure by combining inner and outer layers with oppositely oriented reinforcing fibers. This composite configuration allows the rod body to utilize both layers effectively under bidirectional torsional loads, as each layer's fibers are optimally oriented to resist torsion in one direction while the other layer compensates for the opposite direction
2Ease of manufacture
If prepreg tapes are wound at a wide pitch to simplify the winding process, then the manufacturing is easier, but the inner and outer layers merely reinforce the intermediate layer without providing sufficient torsional rigidity
Solution Approach 1:
By winding the outer layer prepreg tape in the opposite direction to the inner layer, the patent ensures that both layers actively contribute to torsional resistance rather than merely reinforcing the intermediate layer. The crossed fiber arrangement creates a balanced structure that provides sufficient torsional rigidity in both directions
Solution Approach 2:
The patent changes the winding direction parameter (from same direction to opposite directions) to transform the functional behavior of the layered structure. This parameter change enables both inner and outer layers to provide active torsional resistance, converting them from passive reinforcement elements into active load-bearing components
Data Source
AI summary
A rod body for a fishing rod, in which torsional rigidity and the like are enhanced by exercising ingenuity in direction of arrangement of a prepreg tape, is provided. An inner layer 23 is formed by winding a main pattern, which is constituted by a prepreg sheet 52 having a length corresponding to the length of a rod body and provided with reinforcing fibers 42 uniformly aligned, so that reinforcing fibers 42 are tilted relative to the rod axis. An outer layer 25 is formed by helically winding a prepreg tape with small-width 70, which is constituted by reinforcing fibers 42 uniformly aligned in the longitudinal direction, in the rod axis direction so that ends of the prepreg tape 70 in the small-width direction thereof abut closely against each other. The reinforcing fibers 42 of the prepreg sheet 52 and the reinforcing fibers 42 of the prepreg tape 70 are wound so as to cross each other when viewed in a radial direction, with the winding being made helically in directions opposite to each other.