Simon Fraser University, Burnaby, BC. V5A 1S6
Contents
1. BC V5A 1S6 6 1 General Requirements R48 11 The bars must be corrosion resistant and able to hold up to 60 kilograms of static weight R49 I1 Soft plastic shall be used for the grips to allow users to maximize their grasp without injuring their hands 7 User Documentation As we will be trying to market this to seniors we will be ensuring that the documentation that is created is as simple as possible to understand Large diagrams will be imperative to conveying the correct messages 7 1 General Requirements R48 11 Documentation will be included for the end user R49 111 Documentation will be available online R49 111 Documents will be available in multiple languages of specific target markets 9 Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 8 System Testing Plan In the field of medical assisted devices testing and verification is of paramount concern If the device fails even once in a 1000 attempts the result is a failed product Therefore we must be confident that our product will perform as specified above To ensure this subcomponents are tested in isolation first and then integrated together and tested again Once all components are tested the device as a whole will undergo extensive end user trials to identify faults The test approach will be tree method That is starting with the smallest components the leaves and eventually moving down2. seat will be able to be used with an existing toilet This enables the user to have privacy as they use the facilities Furthermore the AST will have two buttons that will allow the user to adjust their heights according to their comfort level We are currently on schedule to complete the prototype ATS for early April 4th of 2011 and it should have the following functionalities The overall structure should be able to accommodate at least 80 kilograms Elevate vertically while carrying a static active load of 80 kilograms Include a shut off switch in the case of emergencies of malfunctions Indicate whether or not the system is on via an illuminated LED for safe troubleshooting Once our prototype is completed we can expand on improving the ergonomics and usability of the overall unit We will address those needs by introducing heated seats and a built in bidet Those extra functions will allow the entire system to be more self sufficient while empowering the users with greater comforts Lastly we will be working in tandem with the CSA 2 during the final production phase to ensure that our device is able to uphold strict standards for society s most vulnerable citizens Copyright 2011 ErgoForm Design Gel ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 Table of Contents Executive SUITING ET ii 1 Introduction secimi eirin aiaro nne aa eae an aaa ee eege 1 Nee E 1 Al EE E 1 1 3 CASS MC TOM E 1 2
3. Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 February 16 2011 Dr Andrew Rawicz School of Engineering Science Simon Fraser University Burnaby BC V5A 1S6 RE ENSC 440 Functional Specifications for the Adjustable Toilet Seat System Dear Dr Rawicz Attached is a document outlining the functional specifications proposed by ErgoForm Design for the design of the adjustable toilet seat system Our system will allow the elderly and persons with disabilities to be lowered and raised from the toilet with ease and comfort With safety and innovation the adjustable toilet seat will allow disabled users access to their own toilets in the privacy of their homes In this document we will specify the high level details of our system and discuss the requirement for each component of the system This document will also be used as a guide for development of the adjustable toilet seat ErgoForm Design is composed of five members Seyed Abbas Jafari Ashkan Mirnabavi Feifan Jiang Faraz Khan and Nickolas Cheng If you have any questions or comments regarding our functional specifications you can contact us through email at nwc sfu ca Sincerely Nib Nickolas Cheng President and CEO ErgoForm Design Enclosure Functional Specification for an Adjustable Toilet Seat Copyright 2011 ErgoForm Design se ErgoForm sign Simon Fraser University Burnaby BC V5A 1S6 ErgoForm Design Adjustab
4. SYSTEM REQUIFEMENKS snis ikai aia E Ea aSa i aiiai 2 ne E 2 EE HE CN 4 2 3 Physical Enger Geet Onde 4 2 4 Mechanical IREQUE GM Deen 4 2 5 Electrical Requirements csicctes aincsachonaetaiuardanialicsacsbiseaetiannsdtaabaundeannmeaaaunnnladsoaaceneman 4 2 6 Environmental Requirements uc csnescdensvestdccaneunddirvnsendseundendteaubongemacpeenddavadelidcaueerddodeentaumestate 4 2 7 Reliability Requirements cccccccessssssececeeececseseeseeececcecsesesaeseeeeeescesenseaseeeeeseseseaeaeseeeeees ses 4 2 8 Safety Requirement EE 5 2 9 Performance Requirements 2xsccdacincicsinvesicunsdoetaceanssaetiaienanaaaatiaciatndies Garam DEE 5 2 10 Usability Requirements E 5 3 Jack lift and Motor REQUINGIIOINES eege dee deeg 6 3 1 General Requirement Sainer nea EAA AEE i 6 3 2 Physical Requirement EE 6 3 3 Electrical Requirement eccsescewecsncseundcenersnrmeaneutiodcnsbunadenesuandinaceucdsnnphiaddausiauenensewndedsbaddanmeeents 6 34 Safety E Te 6 A Angled E UE E 7 4 1 General Requirements EN 7 AZ Ee WC 7 E dree Weu E 7 AM Safety ENT srci aiir EEEN EEEE EE REES 7 RE EE Uu 8 5 1 G neral Requirements esistono oriander neni eni aiena aaan iiaea 8 5 2 Physical Requirement cicsccscsaasnnsiatiscedcdlaaegehedaasenedeiaegdecesnacnesdadegnnsiaadoaenddundenenesadgaladdddgeaddenacact 8 5 2 Electrica tt eege Ea RRE ege LENTE KELAR EAEE 8 5 3 Performance Reeiatt rtEgbeegiogenen geseid 8 6 Grab Bars Requirements sureness iniicitereciin iieiaei a ka enaa ier ia a ae
5. Scope This document describes the functional specifications of the ATS It will be used as the design guide and at any point in the future can serve as evidence of production The requirements stated in this document will be adhere closely and will be reflect in the final product 1 2 Intended Audience This document is to be used by all members of ErgoForm and the board members of ENSC 440 305 The board members will use this document as a reference to gage if all the functional specifications were met for this project All members of the development team will refer to this document for guidance Mechanical and electrical designers shall ensure that the product is designed accordingly Furthermore test engineers will ensure that the product performs the actions a laid out in this document 1 3 Classification In this document the following notation will be used to define requirements Rn p A functional requirement Where n stands for the requirement number and p is the priority of the functional requirement The priority levels are shown below l The requirement applies to the proof of concept system only lI The requirement applies to both the proof of concept and final production system II The requirement applies to the final production system only Copyright 2011 ErgoForm Design a ErgoForm Xx Design Simon Fraser University Burnaby BC V5A 1S6 2 System Requirements The overall function of ErgoForm Des
6. ai na 8 6 1 General R guire ments ecciesie anniina a EEA a EEEE AEE a EEEE 9 Fe User Documentatii Mss a EEA Ea a EAE EAA E a EEE 9 7 1 General Reouirementz 9 SRS ETABS o n T T a an SIA PAA EE tas attest alg Ne A I EEE E 10 8 1 Lifting Ee VE Cu BEEN 10 8 2 Motors and Power SYSCOI EE 11 8 3 Mounted controller ics ansctctescscscaaivascedgaweredawsrandianvxaasdqaeesdioneaaadecel nnandianiars 11 8 4 Proof OF CONCE Dt sesnsarscesedsucdrental inane iaia eaae ak doaia an a aai daan iA 11 DCO TEE 12 10 eet Seege ee tee 13 Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby BC V5A 1S6 List of Figures Figure 1 Overall System Flow Chart eee Figure 2 Overlay of the seat on a standard toilet Glossary AC Alternating Current ATS Adjustable Toilet Seat CSA Canadian Standards Association DC Direct Current LED Light Emitting Diode Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 1 Introduction The ATS is a product that aims to assist the elderly or disable with using the toilet The ATS is a device that will be mounted over existing installations and will help in lowering and raising a disabled person to the toilet sitting surface With simplicity and ergonomics ErgoForm can target a wide untapped market This document will outline the functional specifications of the adjustable toilet seat proposed by ErgoForm 1 1
7. cond when a load exceeding 40 kilograms is applied Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 5 User Interface Requirements The user interface will be composed of two buttons on a small square console The buttons will be responsible for the vertical movement of the jack lift The longer the button is pressed the longer the correlated action will occur 5 1 General Requirements R39 I1 The user interface shall have a basic design that is intuitive R40 11 The buttons must be encased in a water tight chassis R41 I1 The buttons shall depress with minimal pressure R42 11 The up and down buttons must be illuminated to show the user that the ATS is on R43 I1 The buttons must be 0 02 m x 0 02m with a unique appearance that matches their function 5 2 Physical Requirement R44 I1 The button must be of the push button type 5 2 Electrical Requirements IRAS 1 The buttons shall be controlling the current flow to the motor R46 11 The lighting units under the buttons are composed of LEDs and must be powered by at least 5 watts 5 3 Performance Requirements R47 11 Buttons must be responsive when depressed 6 Grab Bars Requirements The grab bars are responsible for giving the user extra leverage when positioning themselves onto the angled seat Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby
8. ed be enhancements will be made at that time 12 Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby BC V5A 1S6 10 References 1 Home Care Products Internet http www selfcarehome com Product aspx l 1766 amp C 24 Feb 02 2009 Feb 16 2011 2 The Canadian Standards Associations Internet http www csa ca cm ca en membership becoming a member tn sustaining members Sept 23 2010 Feb 16 2011 3 M Tjepkema Measured Obesity Adult obesity in Canada Measured height and weight Nutrition Findings from the Canadian Community Health Survey vol 1 pp 8 9 Nov 2008 13 Copyright 2011 ErgoForm Design
9. ign s adjustable toilet seat is outlined below in the following sections 2 1 System Overview Our system is constantly powered from a wall outlet and this allows the seat to be adjusted when specific buttons are pressed Our simple design approach includes two unique buttons that either raises or lowers the entire mechanism The system is entirely current driven such that the longer a button is pressed the longer the action occurs until the minimum or maximum heights are obtained A high level flowchart is shown below and illustrates the overall function of the ATS Yes Is the seat height correct User sits on the angled seat Manually press Up or Down button until desired height is reached Seat slowly becomes depresses the angle until it is parallel to the toilet User can now lower the seat until comfortable User uses the facilities EEN raen by the user until a comfortable height is realized User slowly gets off the chair while aided by the pressure from the angled chair Figure 1 Overall System Flowchart 2 Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 The diagram below illustrates our device superimposed on a standard toilet Figure 2 Overlay of the seat on a standard toilet From the image above the height of the mechanism is changed by the powered jack lift This lifting mechanism is similar to the jack
10. le Toilet Seat System Functional Specification Project Team Seyed Abbas Jafari Ashkan Mirnabavi Feifan Jiang Faraz Khan Contact Person Nickolas Cheng nwc sfu ca Submitted to Dr Andrew Rawicz ENSC 440 Michael Sjoerdsma ENSC 305 School of Engineering Science Simon Fraser University Date February 16 2011 Revision 1 1 Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby BC V5A 1S6 Executive Summary We all share experiences with the elderly and we know as individuals of the younger generation a lot of the conveniences are catered for our age group In our daily lives we rarely consider the difficulties that we may have when performing trivial tasks This is in stark contrast to the elderly where they require significant supervised intervention to allow them to carry on with life One task that we take for granted is going to the washroom comfortably For most seniors and physically challenged this task is plagued with risks of injuries and the lack of privacy Up until this point most systems that offer a slightly less risky method of utilizing the toilet have been the Commodes Their adjustable toilet seat is a self contained bedpan unit that is usually located in the vicinity of the sleeping area 1 After careful research and considerations we at ErgoForm Design have concocted a more effective adjustable toilet seat AST henceforth mechanism Unlike the Commode our
11. m must be able to elevate at least 12 inches 3 2 Physical Requirement R26 I1 The position of the jack lift and motor must be parallel to the ground 3 3 Electrical Requirement R27 11 The mechanism shall be powered by a 12V AC Adapter 3 4 Safety Requirements R28 I1 The screw shaft of the jack lift must be concealed by a chassis R29 11 All sharp edges must be beveled and rounded R30 11 The overall jack mechanism must be resistant to oxidation 6 Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby BC V5A 1S6 4 Angled Seat Requirements The angled seat is a purely mechanical system that utilizes a spring to force it into an angled position 4 1 General Requirements R31 11 The seat must have a normal position with an angle of 60 degrees R32 11 The seat must depress to a final position that is parallel to the toilet as pressure is applied to it R33 III The seat must be made out of hypo allergenic materials 4 2 Physical Requirements R34 II The seat must be the same size as a standard toilet seat R35 III The seat must be a single solid piece with no seams for easier cleaning 4 3 Electrical Requirement R36 I1 The seat will not require electricity to function 4 4 Safety Requirements R37 I1 The spring mechanism must be able to support a static load of 40 kilograms R38 II The seat must depress at an acceptable rate of at least 5 degrees per se
12. s found in an emergency kit in a vehicle Handle bars are also included in our mechanism to allow the users to slowly ease themselves onto the angled seat Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 2 2 General Requirements R1 11 The system must be constantly powered such that users have a minimal wait time R2 II1 The system should not cost more than 1000 CAD R3 II1 The device must be simple to maintain 2 3 Physical Requirements R4 I1 The ATS should occupy only a space of one cubic meter R5 I1 The angled seat should be placed at a sixty degree angle for optimal sitting R6 I1 The ATS should weigh less than 50 kilograms 2 4 Mechanical Requirements R7 11 The user must have easy access to the up and down buttons R8 II1 The ATS must not impede the user during usage 2 5 Electrical Requirements R9 I1 The 12 volt DC motor will be powered by a battery and charged via an AC adapter R10 11 The chosen battery must be durable for long life use 2 6 Environmental Requirements R11 11 The toilet must be of a standard shape This excludes one piece toilets R12 11 The toilet must have the existing seat cover and seat removed R13 11 The ATS must be operational in humid environments 2 7 Reliability Requirements R14 11 The ATS must be able to translate vertically with a load of at least 80 kilograms R15 111 The components of the ATS m
13. sfied once the console has experienced all the corner cases 8 4 Proof of concept The final test is conducted when all of the components of the system are integrated into one complete unit This implies that all the components will be assembled and that the preliminary individual testing has occurred and that they were deemed successful Our test then will focus more on physical abuse and general misuse of the product Examples of such behavior include tipping the device and overloading the seat For instance during the tipping test force will be applied to different points on the sitting surface The application of forces at random positions will change the center of gravity such that the jack lift may fail to operate correctly Once we have verified that the product has a very low percentage of failure we will conclude the testing phase 11 Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 9 Conclusion The functional specifications laid out in this document are fundamental to the development of the ATS and must be followed closely at all stages of development The project is divided into three main components lifting mechanism sitting surface and testing The development of the first two components is well under way and we are on schedule to finish by March 1 as per our proposal document Once we have a functioning prototype we will commence testing and verification If ne
14. to the whole device the root The system individual components to be tested are e Lifting mechanism e Motors and power system e Mounted controller e Proof of concept Since the design is heavily mechanical based the final design must be compared to the proposed drawings specifications Each component is measured to ensure that it complies with the range of motion and weight lifting requirements 8 1 Lifting Mechanism The lifting mechanism is the most crucial test as it will determine whether or not our prototype succeeds Our evaluation of the lifting mechanism must be able to accommodate the design requirements of height and stability The mechanism must extent at least 12 inches above the toilet bowl After completing this test the lifts will be integrated with the electric motors At this point the lift system will be tested again The motors must be able to lift a static load of a predetermined mass in kilograms in a comfortable manner The test will be based on lifting speed lifting weight motor disparity and power consumption For the speed test the motors are to move at a rate such that the user is not thrown about while on the seat nor do they get impatient while waiting for the lift to get into the desired position The weight test will be straight forward According to Statistics Canada an average Canadian ranges from 58 5 kg to79kg with overweight being 94 8 kg 3 Therefore the lifting mechanism will be tested
15. ust be durable and able to last at least two years of usage R16 111 Components of the ATS must be modular and easily replaceable during times of failure R17 111 The ATS should be able to endure physical trauma and minor misuse 4 Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby BC V5A 1S6 2 8 Safety Requirements R18 1I1 The electronic components of the ATS must be housed in a watertight casing R19 11 A power kill switch must be located in the rear of the ATS for safe shutdown during emergencies 2 9 Performance Requirements R20 I111 The ATS shall bring a user to their desired height in a timely manner R21 111 The ATS shall not generate more than 70dB of noise when translating vertically 2 10 Usability Requirements R22 11 The mechanism shall be intuitive and simple to use R23 I11 A user manual shall be created in English for the elderly 5 Copyright 2011 ErgoForm Design Design Goes ErgoForm Simon Fraser University Burnaby BC V5A 1S6 3 Jack lift and Motor Requirements The jack lift will be driven by an attached DC motor As outlined in the electrical requirements above it will require a 12V power adapter The performance requirements were also outlined above such that the vertical translation occurs in a timely manner 3 1 General Requirements R24 I1 The jack lift and motor pair must work in sync with each other R25 I1 This mechanis
16. with a 58 5 kg weight and a 94 8 kg weight The two weights are required as so to ensure users or all weight ranges have the same experience while using the product 10 Copyright 2011 ErgoForm Design Goes ErgoForm Design Simon Fraser University Burnaby BC V5A 1S6 8 2 Motors and Power System The motor disparity test is conducted to ensure if one of the two motors in the system fails no injury will result A failure will be simulated by removing power from on motor and observing the results In the event of power loss the system should remain stable The lifts should not release and go down if the lift is in the erected position Furthermore the two motors must be measured to see if they spin at the same rat This ensures that both lifts are raised and lowered at the same rate The power consumption test is to ensure that when the unit is operating power does not become an issue The test should verify that no circuits are activated during operation In addition there is no excess heat buildup anywhere in the system 8 3 Mounted controller The mounted controller console test to be conducted once the motor and lift mechanism is verified and operational To ensure the proper and reliable operation of the device the remote be robust It must resist physical shocks as well as electrical static It will be tested with both buttons depressed simultaneously Completion of remote test will be complete once the testers are sati
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