Senior Design Review

Andrew BeastenGreg FeatherAlex PhillipsBrendan Moran

Wegman’s Bread Tray Lift Assist

Wegman’s Bread Tray Lift Assist

• Goal:Improve ergonomics for operator during the task of stacking loaded bread trays at the Wegman’s Bakery.

Critical Needs

• Enable good ergonomic practices in terms of lifting and body position

• Meet Wegman’s safety requirements in terms of mechanical operation and physical aspects (sharp edges, pinch points).

• Meet Wegman’s requirements in terms of cleaning and food contamination risks

• Ease of use for operator• The unit should be durable and reliable

Specifications

• Minimize step time• Mechanical components are constructed from

food safe material• Allow for food to descend no closer to the

floor then ½ inch

Hold first and subsequent traysuntil dolly touchesfloor

Lower Trays

Hold Trays

Reset Lift

Release from system

Constant force mechanism

Keep relatively horizontal

Mechanical reset

Continuous reset

Dolly slides off

Tray Slides onto dolly

Eliminate need to bend over

Lower each tray from waist level

Maintain waist level loading

Ramping mechanism

Keep dolly with trays

Functional Decomposition

Holding Trays

Lifting Trays

Remove from System

Reset Lifter

Position Tray

Collapse

Forks ClipsMagnet Flat base Hooks

Spring Weight Piston Rack Pinion Pulley Motor

Fall Push/Pull Lift Magnet

Pedal Switch Lever Button Pull Cord

Walls Guide Rail Slots/Grooves Rubber Stopper

Hinge Cotter Pin Screw Tab

wedge Magnet

Magnet

Manually

clips

Why Not Electric• Skill set– Programming and Controls

• Safely– Eye wash station for battery– Cords are tripping hazard

• Maintenance• Source of power• Less versatile • More complex

Pugh Matrix Results For System

• Criteria Considered:-ease of use, resetability, durability, portability, cost, safety, storage, maintenance, simplicity, and input required

• Ranking system: 1-3

Pugh Matrix Results Reset Mechanism

• Criteria Considered:-Cost, feasibility, practicality, maintenance, safety, simplicity, endurance and adaptability

Proposed Design• Skeleton Frame• Sheet metal wrap

• Springs and Damper• Track guided system• Lockable wheels• Lock at bottom

position

Variation in Design

• Side guard material• Overall material• Foot pedal Release• Fork vs. Plat form

Questions and Comments