Pedal Drive Mount System With Retractable Four-Bar Linkage
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Solution Overview
Problem
Pedal-powered watercraft, such as kayaks, face challenges in loading, transporting, and launching due to the projection of the drive shaft and propulsion unit beneath the watercraft, which increases complexity and difficulty.
Innovation Solution
A pedal propulsion system with a mount portion and a four-bar linkage arrangement that allows the drive column, link support, and upper and lower links to move between an extended and retracted position, enabling a lower profile and easier handling by integrating a column clamp and cradle for secure fixation of the drive column, forming a compact configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the drive shaft and propulsion unit are positioned beneath the watercraft for pedal propulsion, then propulsion efficiency is improved, but the profile height increases making loading and transport difficult
Solution Approach 1:
The patent applies a four-bar linkage mechanism that enables the drive shaft and propulsion unit to dynamically change position between an extended operational position and a retracted storage position. This dynamic reconfiguration allows the system to achieve low profile height during transport while maintaining proper drive shaft positioning during operation, directly resolving the contradiction between propulsion efficiency and profile height.
2Adaptability or versatility
If the drive shaft projects beneath the kayak for pedal drive operation, then leg-powered propulsion is enabled, but the complexity of loading and launching increases
Solution Approach 1:
The four-bar linkage provides a mechanical solution that automatically transitions the drive shaft between extended and retracted positions, reducing the manual handling complexity while maintaining propulsion capability. The mechanism allows single-person operation to easily reconfigure the drive system.
Solution Approach 2:
The drive shaft and propulsion unit can be nested or folded into a compact configuration within the kayak when not in use, similar to a nested doll structure. This nesting capability reduces the overall projection and simplifies loading and launching operations while preserving the full propulsion capability when deployed.
3Power
If the propulsion unit is positioned for optimal propulsion, then propulsion performance is improved, but the overall height and weight increase affecting portability
Solution Approach 1:
The dynamic four-bar linkage mechanism allows the propulsion unit to be positioned optimally during operation for maximum propulsion performance, then retracted to a compact position during transport. This reduces the effective weight and volume that must be handled during portability-critical operations while maintaining full propulsion capability when in use.
Data Source
AI summary
An apparatus for mounting a pedal propulsion system to a watercraft, having a mount portion configured to be attached to the watercraft, a link support, and upper and lower links pivotally connected to the link support and to the mount portion. The link support and upper and lower links are configured to form part of a four-bar linkage arrangement and to simultaneously move together between an extended, operable position for operating the propulsion system, and a retracted, stowed position elevated above the extended position, for loading, transporting, unloading and/or launching the watercraft in the water. A column clamp is configured for selectively fixing a drive column of the pedal propulsion system to the link support, wherein the drive column, the link support and the upper and lower links are configured to simultaneously move together between the extended and retracted positions.