Thrust-Responsive Ski Base with Retractable Teeth
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional ski designs face challenges in achieving optimal grip and glide due to the inherent tradeoff between frictional properties required for pushing and sliding phases, particularly in variable snow conditions and diverse terrain, leading to inefficiencies and safety concerns.
Innovation Solution
A thrust-responsive ski base with a complex molded polymer material featuring retractable teeth that change mechanical resistance based on the axis of applied force, allowing for self-configuring engagement with the snow surface to enhance forward motion and reduce drag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a ski base material provides high friction for pushing phase, then grip is improved, but resistance during gliding phase increases
Solution Approach 1:
The ski base material dynamically changes its surface properties based on the direction of applied force. During the pushing phase, the material exhibits high friction through micro-teeth engagement with snow. During the gliding phase, the material transitions to low friction as the micro-teeth retract or rotate away from the direction of motion, minimizing resistance and energy loss.
Solution Approach 2:
The friction coefficient of the ski base material is not fixed but changes based on the applied load direction and magnitude. The material's surface morphology or molecular orientation changes in response to thrust direction, providing high friction when pushed into and low friction when sliding forward, thus resolving the grip-glide tradeoff.
2Ease of operation
If asymmetric relief features are molded into the ski base to promote forward motion, then forward grip is improved, but backward motion control is reduced
Solution Approach 1:
The ski base incorporates asymmetric micro-teeth or relief features that are oriented to engage with snow primarily in the forward direction. These features have a preferred engagement direction that provides superior grip when moving forward while allowing controlled backward motion or easy release when needed, thus maintaining reliability in backward motion control.
3Productivity
If thrust-responsive surface material is used to enable climbing, then uphill performance is improved, but downhill skiing resistance increases
Solution Approach 1:
The surface material's friction characteristics are dynamically controlled by the direction and magnitude of applied thrust. During uphill climbing, the material engages with snow to provide high friction and traction. During downhill skiing, the material transitions to a low-friction state, allowing gravity to facilitate downward motion with minimal resistance, thus reducing energy loss.
4Adaptability or versatility
If multiple accessory devices are added to skis to address variable snow conditions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The thrust-responsive surface material provides multiple functions within a single integrated component. It automatically adapts to different snow conditions, thrust directions, and skiing phases (pushing, gliding, climbing, descending) without requiring separate accessory devices. This multi-functionality reduces overall device complexity while maintaining high adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved efficiency and safety by naturally toggling between grip and glide modes, enabling effortless forward progress and reduced resistance in various skiing conditions, including uphill and downhill terrain, without the need for frequent adjustments or accessory devices.
Implementation Method 1
The optimal property of the ski while the skier is in the pushing phase is one of high friction, engagement, or resistance between the ski's bottom face and the snow surface. The optimal property of a ski while the skier is in the gliding phase is one of low friction, low engagement, and low resistance between the ski's bottom face and the snow surface.
Implementation Method 2
A ski that has no asymmetry of structure or operation cannot propel the skier preferentially in one direction or another. The present disclosure is directed to minimizing this tradeoff through the use of a surface that configures its relief texture depending upon the axial orientation of an applied force.
Data Source
AI summary
A thrust-responsive structure for skis includes a plurality of retractable elements. Each retractable element includes a portion configured to move from an elevated position to a retracted position. Each retractable element further includes a first retention feature. The structure further comprises a matrix surrounding at least a subset of the plurality of retractable elements. The matrix is static relative to the plurality of retractable elements. The matrix includes a plurality of second retention features configured to captively engage the first retention features of the plurality of retractable elements. A position of each retractable element of the plurality of retractable elements, in the elevated position, is limited by contact between the first retention feature and the second retention feature.