Thermoformed Composite Hockey Pad Shell
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Solution Overview
Problem
Protective pads for hockey and lacrosse, such as elbow and leg pads, face a challenge in balancing protection with weight reduction, as the hard outer shells can fatigue players due to their weight.
Innovation Solution
A method involving three layers: a high-density polyethylene, polypropylene, or polycarbonate outer layer, a non-woven fabric middle layer, and a high-density polyethylene foam intermediate layer, bonded with adhesive films and thermoformed to create a lightweight, shock-absorbing outer shell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hard outer shell is used for protective pads, then protection against impacts is improved, but weight increases causing player fatigue
Solution Approach 1:
The patent applies composite materials by combining a rigid outer shell layer with a foam core layer. The rigid layer provides impact protection while the foam core provides shock absorption and reduces overall weight. This composite structure resolves the contradiction by integrating two materials with complementary properties - the rigid material for strength and the foam for weight reduction and shock absorption.
Solution Approach 2:
The patent applies local quality by creating a multi-layer structure where different regions of the outer shell have different properties. The outer surface maintains rigidity for protection, while the internal foam core provides cushioning and weight reduction. This allows the shell to have both hard protective qualities where needed and softer, lighter qualities in other regions.
2Object-affected harmful factors
If a foam layer is added to the outer shell, then shock absorption is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the outer shell into distinct functional layers: a rigid outer layer and a foam core layer. Each layer can be manufactured separately using optimized processes for that material type, then assembled together. This segmentation allows each layer to be produced with appropriate manufacturing techniques without requiring a completely new complex manufacturing system.
Solution Approach 2:
The patent uses composite materials construction where the rigid shell and foam core are assembled together. This approach allows leveraging existing manufacturing capabilities for both rigid plastics and foam materials, combining them through joining techniques rather than requiring entirely new manufacturing processes.
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 method results in a lighter, more effective protective pad that absorbs shock and maintains rigidity, reducing player fatigue while providing adequate protection against impacts.
Implementation Method 1
affixing a first layer of adhesive film on the top side of the third sheet; affixing a second layer of adhesive film on the bottom side of the third sheet
Implementation Method 2
placing the composite sheet in an oven at a temperature between 125° C. and 175° C. during 10 to 20 minutes
Implementation Method 3
thermoforming the composite sheet for forming the outer shell wherein the outer shell has a shape suitable for a hockey or lacrosse leg pad, shoulder pads or elbow pad
Data Source
AI summary
A method of making an outer shell, the method comprising: (a) providing first and second sheets, each of the first and second sheets being made of a layer of high-density polyethylene, polypropylene, polyurethane or polycarbonate extruded with a layer of non-woven fabric; (b) providing a third sheet made of high-density polyethylene foam, polypropylene foam, polyurethane foam or polystyrene foam, the third sheet having top and bottom sides; (c) affixing a first layer of adhesive film on the top side of the third sheet; (d) affixing a second layer of adhesive film on the bottom side of the third sheet; (e) placing the third sheet between the first and second sheets such that the first layer of adhesive film of the third sheet contacts the layer of non-woven fabric of the first sheet and the second layer of adhesive film of the third sheet contacts the layer of non-woven fabric of the second sheet; (f) stitching together the first, second and third sheets in order to form a composite sheet; and (g) thermoforming the composite sheet for forming the outer shell wherein the outer shell has a shape suitable for a hockey or lacrosse leg pad, shoulder pads or elbow pad.


