Inflatable Kneepad Anchoring on Inclined Surfaces
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Solution Overview
Problem
Conventional kneepads are ineffective on inclined surfaces, such as roofs, as they fail to remain in place due to gravity and restrict movement, posing safety and comfort issues for workers like roofers.
Innovation Solution
A kneepad design featuring a pad with a contacting interface that adheres to inclined surfaces, a leg connector to secure the pad to the knee, and a foot connector that extends along the leg to prevent sliding, with adjustable and flexible components for secure fit and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional kneepads are used on inclined surfaces, then the kneepad provides cushioning protection, but the kneepad slides down due to gravity and cannot remain in place
Solution Approach 1:
The kneepad incorporates a flexible bladder that can be inflated or deflated to adjust the surface area and contact pressure dynamically. When inflated, the bladder expands to increase friction and adhesion to the inclined surface, preventing sliding. When deflated, it allows easier positioning and adjustment. This dynamic adjustment resolves the contradiction between stability and ease of positioning.
Solution Approach 2:
The kneepad changes its physical parameters (surface area, contact pressure, flexibility) by adjusting the inflation level of the bladder. By varying these parameters, the kneepad can adapt to different inclines and surface conditions, maintaining reliability while allowing operator control for positioning.
2Reliability
If kneepads are designed for horizontal surfaces only, then the structure is simple, but the kneepad cannot remain in place when force is applied along the tibia on inclined surfaces
Solution Approach 1:
The flexible inflatable bladder provides a dynamic anchoring mechanism that activates only when needed on inclined surfaces. The bladder can be inflated to create friction and adhesion forces that counteract gravity, providing reliable anchoring without requiring complex mechanical anchorages or rigid structures that would complicate the design.
Solution Approach 2:
The kneepad uses a flexible inflatable bladder as the contacting interface instead of rigid structures. This flexible membrane can conform to the inclined surface and generate sufficient friction and adhesion through inflation, providing reliable anchoring with minimal structural complexity.
3Ease of operation
If kneepads provide significant movement capability through rollers, then the user can move freely, but the kneepad becomes dangerous for use on inclined surfaces
Solution Approach 1:
The kneepad uses a controllable inflatable bladder that can be adjusted based on the working conditions. On inclined surfaces, the bladder is inflated to create high friction and prevent unwanted rolling or sliding. On flat surfaces, it can be deflated to allow controlled movement. This dynamic control eliminates the safety hazard while preserving movement freedom when appropriate.
Solution Approach 2:
The friction coefficient and contact pressure are varied by adjusting the bladder inflation level. This parameter change allows the kneepad to transition between a high-friction state for safety on inclines and a lower-friction state for movement on flat surfaces, resolving the contradiction between safety and movement freedom.
4Reliability
If the foot connector is made rigid to prevent sliding, then stability is improved, but the kneepad restricts natural leg movement and reduces comfort
Solution Approach 1:
The foot connector uses a flexible strap with adjustable length instead of a rigid structure. The flexibility allows natural leg movement and adjustment, while the adjustable length (when tightened) provides sufficient constraint to prevent excessive sliding. This resolves the contradiction between stability and movement freedom by providing dynamic adaptability.
Solution Approach 2:
The foot connector is made from flexible strap material that can accommodate natural leg movements and anatomical variations. The flexibility ensures comfort and freedom of movement, while the adjustability mechanism allows the connector to be tightened to provide adequate stability when needed.
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 kneepad effectively remains in place on inclined surfaces, allowing for safe and comfortable movement by distributing weight and friction, while maintaining stability and freedom of movement for workers.
Implementation Method 1
a contacting interface being adapted to adhere to the inclined work surface
Implementation Method 2
the foot connector is load-bearing to refrain the body from sliding up the wearer's leg by substantially more than a maximum length when a force is applied along the wearer's leg
Data Source
AI summary
A kneepad adapted to be worn on a wearer's leg for working on an inclined work surface at various working angles. A pad defines an open cavity for receiving the knee of the wearer, and a contacting interface for adhering to the inclined work surface is secured to the pad. A leg connector is connected to the body of the kneepad and securable to a knee region of the wearer's leg, the leg connector being adapted to abut the pad against the knee. A foot connector is connected to the body of the kneepad and securable to a foot region of the wearer's leg, the foot connector extending from the body of the kneepad to the foot region along the wearer's leg. The foot connector is load-bearing to refrain the body from sliding up the wearer's leg when a force is applied along the wearer's leg.