Recumbent Bicycle Boom Alignment via Locator Tab and Slot
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing recumbent bicycle designs face difficulties in maintaining proper alignment between the pedals and the main frame due to the boom's free rotation during telescoping adjustments, leading to misalignment issues.
Innovation Solution
An improved boom design featuring an elongated slot and reinforcing plates, combined with a boom clamp that includes a locator tab engaging with a notch in the center tube, ensures precise alignment by preventing rotation during telescoping movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the boom is allowed to rotate freely during telescoping movement, then the boom can easily adjust the pedal position, but the alignment between the pedals and main frame becomes misaligned
Solution Approach 1:
The locator tab acts as an intermediary element between the boom and the center tube, engaging with the elongated slot to prevent rotational movement while allowing telescoping adjustment. This mediator maintains the angular relationship between the boom and main frame, ensuring pedal alignment precision without restricting the ease of length adjustment.
2Ease of manufacture
If the boom structure is made simple without internal reinforcement, then the boom is easier to manufacture, but the boom lacks sufficient rigidity and strength
Solution Approach 1:
The boom employs a composite structure combining the outer boom tube with internal reinforcing plates. These plates are positioned to provide maximum structural support while being integrated into the boom tube, creating a composite assembly that achieves high rigidity and strength. The reinforcing plates can be manufactured separately and then installed, balancing manufacturing ease with structural performance.
3Manufacturing precision
If the locator tab is positioned to prevent rotation, then the pedal alignment is maintained, but the locator tab must engage with both the slot in the boom and the notch in the center tube
Solution Approach 1:
The locator tab merges multiple functions into a single component: it engages with the elongated slot in the boom to prevent rotation, simultaneously interfaces with the notch in the center tube to establish angular orientation, and guides the telescoping movement. This consolidation of functions into one element achieves precise alignment without significantly increasing device complexity.
Data Source
AI summary
A recumbent bicycle includes a boom that telescopes within one end of a center tube in the main frame of the bicycle, and a boom clamp that encircles the center tube of the main frame at a location overlying at least a portion of the boom. The boom clamp has a locator tab which extends into a notch formed in the center tube, and within a slot formed in the boom while the boom telescopes within the center tube. The location of the slot in the boom, and the location of the tab relative to the center tube, are chosen to ensure that throughout the telescoping movement of the boom it is retained in a desired orientation with respect to the main frame.