Bicycle Seat Frame With Through-Hole Grip For Carrying
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Solution Overview
Problem
Existing frame structures for heavy vehicles like electrically assisted bicycles and downhill bikes impose a large load on the user's hands when carrying the vehicle, making it difficult and burdensome due to increased weight and strain.
Innovation Solution
A frame structure with a through hole in the seat frame and a flat, reinforced grip portion that allows easy gripping, featuring a thickened inner peripheral wall and ribs for enhanced strength and rigidity, along with a cover member to guide the hand and protect from dirt.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a band made of leather or frame members are used as handles for carrying the bicycle, then the bicycle can be carried, but the burden on the user's hand is increased and the load on the frame is large
Solution Approach 1:
The seat frame is designed with a localized through-hole structure that provides a grip portion specifically for carrying. This local modification creates an ergonomic handle area without requiring changes to the entire frame structure, concentrating the carrying function in a specific location while maintaining the original frame integrity.
Solution Approach 2:
The through-hole in the seat frame acts as an intermediary structure between the user's hand and the frame. By providing a dedicated hole for hand insertion, it mediates the contact between the user and the frame, distributing the carrying load more effectively and reducing direct strain on the hand while avoiding excessive load concentration on specific frame members.
2Ease of operation
If the grip portion is formed by stretching a band between down tube and seat tube, then the bicycle can be carried, but the load on the band and frame is large
Solution Approach 1:
The invention extracts the carrying function from the external band or separate frame members and integrates it directly into the seat frame structure itself. By forming the through-hole and grip portion as part of the seat frame, the carrying capability is built-in, eliminating the need for separate bands and their associated strength limitations.
Solution Approach 2:
The carrying function is merged with the seat frame structure by integrating the through-hole and grip portion directly into the seat frame. This combination allows the frame itself to serve as the carrying handle, distributing loads across the frame structure rather than concentrating them on separate bands or components.
3Ease of operation
If the through hole is formed in the seat frame, then easy gripping is achieved, but the structural components around the seat frame may contact the hand
Solution Approach 1:
The inner peripheral wall is designed to extend sufficiently downward from the grip portion to preliminarily prevent contact between the hand and surrounding components before the hand can reach them. This preliminary protective structure ensures that when the user grips the handle, their hand is contained within the through-hole and cannot contact external components that might be dirty or cause discomfort.
4Strength
If the inner peripheral wall is made thick to increase strength, then the grip portion strength is improved, but the weight of the seat frame increases
Solution Approach 1:
The thicker inner peripheral wall is applied locally only at the grip portion where strength is most needed for carrying, rather than uniformly throughout the entire seat frame. This localized thickening provides the necessary strength at the critical stress point while minimizing the overall weight increase of the seat frame.
Solution Approach 2:
The wall thickness parameter is changed specifically at the grip portion to optimize the balance between strength and weight. By adjusting the thickness parameter locally where it provides maximum benefit for carrying strength, the design achieves improved load-bearing capability with minimal penalty to overall frame weight.
Data Source
AI summary
This frame structure includes: a head pipe; a main frame extending rearward from the head pipe; and a seat frame disposed above the main frame and supporting a seat, wherein the seat frame includes a through hole that passes through a region within a front-rear width and a vertical width of the seat frame in a left-right direction in a side view, and wherein a grip portion that follows an upper edge of the through hole is formed in a flat shape extending in a front-rear direction.