High-Load Fabric Clamp Using Capstan and Pinching Effects
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Solution Overview
Problem
Current holding clamps fail to securely fasten fabrics at high tension values, leading to slippage and potential structural failures due to their reliance on insufficient pinching effects.
Innovation Solution
The development of high holding power clamps that incorporate both capstan and pinching effects, featuring multiple capstan and pinch effect areas to securely restrain fabrics, with designs such as the 'single-V' and 'double-V' configurations, utilizing a wedge and pressure source to distribute force effectively across curved and angled surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional holding clamps rely on pinching effect to secure fabric, then the clamp structure is simple, but the holding capacity is insufficient for high-tension fabrics
Solution Approach 1:
The clamp is divided into multiple independent capstan effect areas (at least four) and pinching effect areas (at least three), allowing each segment to contribute to the overall holding capacity. This segmentation enables the clamp to achieve high holding power through cumulative effect while maintaining modular simplicity in each individual component.
Solution Approach 2:
The invention merges two previously separate mechanisms (capstan effect and pinching effect) into a single integrated clamp structure. The capstan effect areas provide friction-based holding while the pinching effect areas provide mechanical constraint, and their combination creates a synergistic effect that dramatically increases holding capacity beyond what either mechanism could achieve alone.
2Reliability
If the clamp uses only pinching effect to secure fabric, then the clamp design is simple, but fabric slippage occurs at high tension
Solution Approach 1:
The capstan effect areas are positioned to engage the fabric before the pinching effect areas are fully activated. This preliminary engagement creates initial friction-based restraint that prevents fabric slippage during the clamping process, ensuring reliable securement from the outset rather than relying solely on pinching action.
Solution Approach 2:
The capstan effect areas act as intermediary elements between the fabric and the primary pinching mechanism. These intermediate friction-based contact points distribute and transform the applied force, preventing direct slippage at the pinching points and enhancing overall fabric securement reliability.
3Strength
If the clamp is designed to handle maximum fabric tension, then the holding capacity increases, but the risk of fabric slippage before fabric failure increases
Solution Approach 1:
The capstan effect areas utilize curved surfaces around which the fabric is wrapped, creating multiple contact points that generate frictional forces. This curvature transforms linear pull forces into radial compression forces, dramatically increasing the holding capacity through friction while preventing fabric slippage even at maximum tension levels.
Solution Approach 2:
The invention transitions from a single-dimensional pinching force to a multi-dimensional force system combining radial compression (from capstan effect) and axial constraint (from pinching effect). This dimensional expansion of the force application creates a three-dimensional constraint field that securely holds fabric at high tension without slippage.
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
These clamps achieve holding capacities exceeding 5,143 lbf per inch, with some embodiments capable of withstanding over 6,862 lbf per inch, ensuring the fabric tears before slippage occurs, thus providing reliable securement of high-tension fabrics in various applications.
Implementation Method 1
The capstan equation relates the hold-force to the load-force if a flexible line is wound around a cylindrically curved surface. Because of the interaction of frictional forces and tension, the tension on a line wrapped around a capstan may be different on either side of the capstan.
Implementation Method 2
State-of-the-art fabric clamps generally rely on a pinching effect, which is insufficient to secure many fabrics at the maximum fabric tension available in many high-strength fiber weaves.
Data Source
AI summary
The present invention is generally directed towards clamps for high tension load applications. In particular, the invention relates to high holding power clamps in which fabric can be secured, and which can withstand a large amount of force, including, in at least some embodiments, the maximum amount of tension permitted in various modern high strength fabrics and/or fiber weaves. In at least one embodiment, a holding clamp has a single-V design, with at least three areas that exert pinching effects on fabric held in the clamp, and at least four capstan areas that exert capstan effects on the clamped fabric. In at least a further embodiment, a holding clamp has a double-V design, with at least six areas that exert pinching effects on fabric held in the clamp, and at least seven capstan areas that exert capstan effects on the clamped fabric.