Lever Drive Bicycle With Adjustable Saddle and Backrest Support
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Solution Overview
Problem
Existing two-wheeled cycles with lever drives lack an efficient mechanism for transmitting motion from the rider's back and legs to the pedals, resulting in inefficient energy conversion and stability issues, particularly when adjusting the seat height and position.
Innovation Solution
A two-wheeled cycle with a lever drive system featuring parallel vertical bars ending in backrests, connected to a seatpost and pedal axles via a support mechanism with movable and rigid attachments, utilizing left and right rubbers to facilitate smooth pedal rotation and incorporating an adjustable saddle with concave discs and clamps for enhanced stability and adjustability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lever drive system with parallel vertical bars is used, then energy transfer efficiency is improved, but device complexity increases due to the support mechanism with multiple movable and rigid attachments
Solution Approach 1:
The lever drive system is divided into separate functional components: parallel vertical bars for lever motion, support tubes for structural support, and distinct rigid/movable attachment points. This segmentation allows each component to perform its specific function efficiently while maintaining overall system manageability despite the complexity.
Solution Approach 2:
The system employs a hybrid attachment mechanism where some connections are rigid (for stable energy transfer) and others are movable (for adaptive motion accommodation). This dynamic design allows the structure to adapt to varying operational conditions while maintaining efficient energy transfer from the rider's back and legs to the pedals.
2Adaptability or versatility
If an adjustable saddle with concave discs and clamps is incorporated, then adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The saddle assembly is segmented into the saddle body, concave discs for positioning, and clamps for securing. This modular design enables independent manufacturing of each component using standard processes, then assembly to create the adjustable mechanism, balancing adaptability with manufacturing feasibility.
Solution Approach 2:
The adjustable saddle uses a dynamic clamping mechanism that allows the saddle position to be changed along the seatpost while maintaining secure attachment. The clamps can be easily opened and closed to adjust position, providing adaptability without requiring complex manufacturing processes for the adjustment mechanism itself.
3Stability of the object's composition
If rubbers connecting crankset with frame are used, then stability is improved through smooth pedal rotation, but device complexity increases due to additional connection components
Solution Approach 1:
Rubbers are introduced as intermediary elements between the crankset and frame, serving as flexible connectors that absorb vibrations and smooth out rotational irregularities. These rubber elements act as mediators that improve stability by dampening mechanical shocks while adding minimal structural complexity compared to rigid metal connections.
Data Source
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AI summary
The subject of the invention is a bicycle, especially a two-wheeled bicycle, with a lever drive consisting of two vertical bars parallel to each other and ending in the upper part with a backrest with a harness, equipped with two horizontal brackets attached to the frame, according to the invention characterised in that: the axle bracket (11) is rigidly attached to one side of the seatpost (10) and is attached on the other side to the bar axle (7); bars (1) are movably attached to the ends of the bar axle (7), and on the other side the seatpost (10) is rigidly connected to the tube (15) rigidly connected to the frame brackets (4); the bicycle features a support mechanism consisting of the upper backrest (2) and lower backrest (3) connected by the upper and lower backrest connector (37); cables (41) are rigidly attached to the lower ends of bars (1) and connected to pedal axles (43), to which rubbers (44, 45) are movably attached, and the bicycle is equipped with an adjustable saddle (48) mounted on the frame brackets (4).