fire extinguisher redesign

Fire Extinguisher RedesignMaddie Burke

Design Project ManagementStudent Initiated Projects: R12900

Spring 2011-2012

Functional Timeline

FIRE REMOVE EXTINGUISHER

REMOVES SAFETY PIN

ALARM ON BOX GOES OFF

PRESS TRIGGER

ACTUATES VALVE

RELEASES WATER

REMOVE CYLINDER

REFILL CYLINDER WITH WATER

RELOAD EXTINGUISHER

BOX AUTOMATICALLY PRESSURIZES

CYLINDER OF H20

INDICATORS SHOW ‘READY TO USE’

RELOAD EXTINGUISHER INTO

BOX

INDICATORS CHANGE TO ‘USED’

Functional Flow DecompositionEXTINGUISH

RELOAD

TRIGGER SPRAY FORCE

EXTINGUISHER INTO BOX

REMOVE FROM BOX

REMOVES SAFETY

CHANGES INDICATORS

CONVERT FORCE TO OPEN VALVE

SPRAYS OUT WATER

RESET INDICATORS

EMPTY H2O CYLINDER

REPRESSURIZE WATER

RELOAD SAFETY

RELOADED EXTINGUISHER

WATER INTO CYLINDER

CYLINDER INTO EXTINGUISHER

Fire Extinguishers• Materials• Spray time• Size• Weight• Price• Rating• Water amount• Spray range

Benchmarks: Fire Extinguishers

Constraints• Under 15 lbs• 2.5 gallons of

water• Rechargeable • Cost to design

Benchmarks: Intentionally Intuitive Devices

Metrics and Specifications

Difficulty of Metrics and Specifications

House of Quality Cross Linking• every customer need

is met by some engineering specification

• Some x-ed off as “related” if not directly dependent on one another

Suggested Staffing Requirements

Project Scope Feedback• Staffing: industrial design student would bring a

unique set of skills to the design• Safety: there will have to be some sort of testing box

in case of explosion of the pressurized vessel during tests

• Specifications: intuitive design aspects will be hard to quantify, a wide range of user testing will be needed

• Scope: project would include extinguisher design and box design, could be split into different jobs (as shown in the staffing slide) so multiple things can be worked on at once

QUESTIONS?