156B Week 4

Overview of Status of Analysis, Design, Fabrication, Tests, etc.

• • Ordered springs for prototype

  • Researching locking mechanisms

  • Beginning force analysis on safety mechanism

  • Beginning fabrication of linear slider

Accomplishments from Previous Week

• • Completed energy analysis of scissor jack

  • Determined spring constant needed to power linear slider

  • Compared all linkage design options in a table

Goals for Next Week (list names after each item). Use specific and measurable objectives.

• • Complete fabrication of linear slider prototype - Travis

  • Decide on locking mechanism to build - CJ

  • Draw locking mechanism in Solidworks - Justin

  • Complete first draft of report and website - Team

  • Plan tests for prototype - Stephanie

Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)

• • Notes from meeting on 4/17/12

    • Ideal if device could be left on IV pole throughout set up and operation

    • Clearance between plates can probably be 2.5 inches

    • Any levers on the device should be made to go in a downward motion

  • Prefers linear slider over scissor jack because scissor jack has a lot of pinch points

Instructor Comments from Last Meeting and Actions Taken to Address these Comments  (indicate date of comments and if via email or in person)

• • Notes from meeting on 4/16/12

    • In analysis, write and label everything clearly

    • Look into constant force springs

    • Create table comparing linkage designs

  • Notes on presentation from 4/17/12:

    • Build prototype early in order to allow assembly and troubleshooting of problems and to move on to a different prototype if need be

    • In the pictures of the prototypes, insert an actual model of the IV bag to be more clear about what you are squeezing

  • Describe more clearly the needs of your device early on

  • What is the mechanism to squeeze bag (spring force or other force)

  • How is the device held open when an IV bag is being inserted or removed

Comments from Other Students in the Class (indicate date of comments and if via email or in person)

• • Comments on presentation from 4/17/12:

    • Add pictures to the device comparison chart

    • Does the device have to be mounted on an IV pole or could it be mounted to the bed?

    • A lever may be a good way to get the device open.

  • For the wedge idea, a handle could make it more user friendly

Risks and Areas of Concern

• • Jamming of the linear slider

  • Spring pinching

  • Spring tensioner

Resources or Information Required but not Available

• • None

Schedule

• • Complete linear slider prototype

  • Decided on locking mechanism

  • Test prototype for flow rate

  • Test prototype for usability

Budget (list amount spent and amount remaining)

• • $90.11 spent

  • $2409.89 left

Progress on Report and Webpage

• • Began first draft of report

  • Added background information and pictures to website