Dropper Seatpost Collar With Counterbore for Saddlebag Mounting
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Solution Overview
Problem
Conventional saddlebag attachment methods interfere with the function of dropper seatposts, potentially causing damage and reducing the travel of the dropper post, which diminishes the bike's rideability.
Innovation Solution
A collar attachment with a counterbore design that allows it to fit over the dropper post collar, minimizing travel loss and featuring front and rear lower lips to secure the saddlebag strap, constructed from rigid materials with an optional TPU lining for compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a simple collar is attached to the upper post to secure the saddlebag, then the saddlebag can be fastened to the seatpost, but the travel of the dropper post is reduced
Solution Approach 1:
The collar attachment is designed with a counterbore structure where a smaller first internal bore is nested within a larger second internal bore. This nesting allows the collar to fit over the dropper post collar while maintaining adequate clearance, enabling the dropper post to achieve near-full travel while still providing secure saddlebag attachment.
Solution Approach 2:
The invention transitions from a single-bore design to a two-bore counterbore design, adding a dimensional layer to the collar structure. The first bore (smaller diameter) engages with the seatpost while the second bore (larger diameter) accommodates the dropper post collar, creating vertical clearance that restores dropper travel without compromising attachment security.
2Ease of manufacture
If conventional attachment methods are used, then the saddlebag can be mounted, but the dropper seatpost function is interfered with and potential damage occurs
Solution Approach 1:
The collar attachment serves as an intermediary component between the saddlebag strap and the dropper seatpost. By positioning the collar below the dropper post collar and using the counterbore structure, it mediates the attachment process to prevent direct interference with the dropper mechanism, eliminating the risk of damage while maintaining ease of saddlebag mounting.
Solution Approach 2:
The collar is designed to be pre-positioned on the seatpost at a specific location below the dropper post collar. This preliminary positioning ensures that when the saddlebag is attached, the strap is captured by the lips of the collar before it can interfere with or damage the dropper seatpost mechanism, preventing harmful effects in advance.
3Reliability
If the collar reduces dropper travel, then the saddlebag can be securely attached, but the bike's rideability is diminished
Solution Approach 1:
The nested counterbore structure allows the collar to maintain a compact form while providing sufficient vertical clearance. The first bore secures the attachment function while the second bore accommodates the dropper post collar, enabling near-full dropper travel (only 10-20mm reduction) and preserving bike rideability without sacrificing saddlebag attachment reliability.
Data Source
AI summary
A collar attachment for use with dropper seatposts on bicycles for securely attaching saddlebags during touring or bikepacking. The collar attachment includes front and rear lower lips for supporting respectively a strap and a mounting attachment of the bag. The collar attachment has a first internal bore, possibly provided with a resilient, tacky liner, which is a close fit around the seatpost, and a second internal bore, of larger diameter than the bore, which allows the collar to drop over a dropper post collar, minimising any loss of dropper travel. The invention may include a resilient and tacky lining such as thermoplastic polyurethane (TPU) to accommodate a wide range of diameter dimensions and tolerances.