Bicycle Seat Post Bushing for Quick Height Adjustment
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Solution Overview
Problem
Current bicycle seat post adjustments are inconvenient as they require repeated operations to find the suitable height of the inner tube, especially after it has been lowered for storage, leading to increased time and effort for riders.
Innovation Solution
A seat post assembly with a rotatable bushing that includes an exposed portion for easy access, a barrel portion with limiting slots to set the inner tube's height, and a sealing element to facilitate quick adjustments without removing the cap, allowing riders to conveniently adjust and lock the inner tube's height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the inner tube is lowered to save storage space, then storage space is saved, but the height adjustment time increases on the next ride
Solution Approach 1:
The bushing is pre-adjusted to the desired height position before the inner tube is lowered for storage. The limiting grooves on the bushing are positioned in advance to correspond with the protrusion on the inner tube, so that when the inner tube is reinstalled, it automatically engages with the pre-set height limit, eliminating the need for time-consuming height adjustments on the next ride.
Solution Approach 2:
The bushing acts as an intermediary component between the inner tube and the outer tube. It provides limiting grooves that interact with the protrusion on the inner tube to mechanically constrain the inner tube's height position. This intermediary mechanism enables quick height adjustment by simply rotating the bushing to align different limiting grooves with the protrusion.
2Shape
If the limiting bushing is hidden in the cap, then the appearance is cleaner, but the operation complexity increases as the cap must be removed for adjustment
Solution Approach 1:
The adjustment function of the bushing is extracted and made accessible through the sealing element. The exposed portion of the bushing protrudes through the sealing element, allowing riders to directly access and rotate the bushing for height adjustment without needing to remove the cap. This extraction of the adjustment function maintains the clean appearance while significantly improving ease of operation.
Solution Approach 2:
The bushing is designed to be self-adjustable through the exposed portion that penetrates the sealing element. Riders can independently adjust the height by rotating the exposed portion of the bushing, which self-activates the height adjustment mechanism without requiring removal of the cap or assistance from others.
3Ease of operation
If repeated adjustments are made to find suitable height, then the desired height is achieved, but operation time and effort increase
Solution Approach 1:
The bushing is pre-adjusted to the desired height position before the inner tube is lowered for storage. The limiting grooves on the bushing are positioned in advance to correspond with the protrusion on the inner tube, so that when the inner tube is reinstalled, it automatically engages with the pre-set height limit, eliminating the need for time-consuming height adjustments on the next ride.
Solution Approach 2:
The bushing is divided into functional segments: the exposed portion for adjustment operation, the barrel portion with multiple limiting grooves for different height positions, and the portion engaged with the inner tube. This segmentation allows the rider to quickly select the desired height by rotating the bushing to align the appropriate limiting groove with the inner tube protrusion, reducing adjustment time and effort.
Data Source
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AI summary
A seat post assembly (10) includes an outer tube (20), an inner tube (30) disposed movably in the outer tube (20), a sealing element (36) disposed on the top end of the outer tube (20) to fill the gap between the outer and inner tubes (30), and a bushing (40) rotatably disposed on the top end of the outer tube (20) and penetrated by the inner tube (30). The bushing (40) has an exposed portion (41) located in the sealing element (36) or the outer tube (20) in such a manner that the exposed portion (41) isn't shielded and can be touchable, and a barrel portion (42) coaxially connected with the exposed portion (41) and located in the outer tube (20) and having a bottom abutted against a protrusion of the inner tube (30) for limiting the ascending height of the inner tube (30). Therefore, the present invention allows a rider to touch the bushing (40) without taking it out, thereby facilitating the total height adjustment of the inner tube (30).