2. PROCESS FLOW
CHART
Function Analysis
Problem Statement
Cause and Effect Chain Analysis
ARIZ
Proposed Solution
FUNCTION
ANALYSIS
Knee Frame Holder
with Spring Socket
and Rod
Bearing
Spring
Calf Frame
Knee Joint
Plate
People
(Knee)
Thigh FrameHolds
Holds Holds
Holds
Holds
Rubs
Turns
3. CAUSE AND EFFECT CHAIN
ANALYSIS
Less Securing Joint
Unbalanced Force
Spring at One Side of
Body
Hurt (Leg)
Misalignment of Joint
Poor System Adaption
Too Tight Around
Joint
System Loose
Not Conforming to
Body Physiology
4. ARIZ – SECTION 1
Step 1.1 Mini Problem
It is necessary for the knee joint to fit to body without damaging or hurting the body of
user, while keeping the engineering system almost unchanged.
Knee Joint
Plate
Leg (Knee)
TOOL Product
Knee Joint Leg
Hurt
Adapt
Knee Joint Leg
Does Not Hurt
Does Not Adapt
EC-1 EC-2
Step 1.2 Tool and Product
Step 1.3 Engineering Contradiction
5. Time Period 1 Period 2
T1 No conflict. No conflict.
T2 ZB rubs against knee ZA, ZC moves (rotate)
T3
ZB press on knee and
causes pain
ZA, ZC no longer at
starting position.
Internal Substance External Substance
Tools Knee joint plate Environment
Ground level /
Structure
Product Knee
Object of
harmful action
Knee joint plate
orientation
Fabric/lace
Object of
useful action
Lace
STEP 2.1 OPERATING SPACE
STEP 2.2 OPERATION TIME
STEP 2.3 SUBSTANCE FIELD RESOURCES
Rotation
Rubbing
Useful
Zone of
Operation
6. STEP 3.1 IDEAL FINAL RESULT
X-component eliminates the misalignment issue and enables the joint to adapt
to user completely in order to support body during operating time of T2 and T3
without making the system more complex and without any harmful
consequences.
Tool / Product Substance Parameters
Tool: Joint plate Mild steel Contour (shape)
Thickness
Dimension (size)
Weight
Product: Knee Human flesh Contour (shape)
Dimension (size)
Circumference (radius)
Operating Space Resources
Bearing Flexible ball
bearing
Degree of flexibility (rotation in x-y
plane)
Size
Frame holder Mild steel Dimension (size)
Weight
Spring (torsion spring) 3mm stainless
steel
Wire diameter
Coil diameter
Mean diameter
Material
Vibration from walking Reaction force generated
Direction of vibration
Resultant force Spring Direction
Lace Fabric Elasticity
Type
7. STEP 3.3 MACRO LEVEL PHYSICAL
CONTRADICTION
• If body can adapt well to joint plate, then joint will be able to operate
optimally, but it hurts leg.
Step 3.5 IFR Refinement
• During the release or compression of the plate, the plate must be able to
provide on its own the restriction to stay static and has to provide structural
support to the spring.
BodyPlate
FMech
BodyPlate
FMech
8. SECTION B - REMOVING THE PHYSICAL
CONTRADICTION
Step 4.1 Physical Contradiction Solution
• Where do I want soft? I want soft on knee.
• Where do I want not soft? I want not soft on spring.
Inventive
Principles
Description
Intermediary
Add a layer of spongy material between knee and
plate.
Asymmetry
Create a knee plate that follows the knee shape of
user.
Step 4.2 Su-Analysis and Solution
BodyPlate
FMech
Inventive
Solutions
Description
2.2.1 Add spongy in between knee and knee joint plate.
2.2.4 Use solid brace with magic strap.
9. Thigh Frame
Holder
Plate
Bearing
2 of this component at each
side of knee.
Connected through a hard
brace that joint with plate.
PROPOSED SOLUTION
Intermediary
