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GT Carabiner with Changeable Charm

Natalie Raia

ME 1770 INDIVIDUAL DESIGN PROJECT

PART 2

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Description of Design

  • Carabiner - metal loop with a spring-loaded gate used to connect components
    • embellished with screw-in Georgia Tech charm
  • Uses: fasten keys to belt loops, carry around water bottles, attach items to backpacks
  • To generate this product idea, I used the UnTiED ideation method of finding connections between two unrelated objects. My product combines features of two existing products, melding the functionality of a carabiner with the customizability of screw-in stone jewelry.
  • This design idea reflects the design heuristics 42 (making components attachable and detachable) and 9 (allow user to customize). The user will have the option to personalize the appearance of the product with a range of interchangeable Georgia Tech charms.

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DRAWINGS

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Carabiner Assembly Tree

Carabiner Body Part Tree

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Part Name

Modeling

Approach

Manufacturing Process

GD&T parameter to Control

Tolerance with symbol

Carabiner Body

Sweep, Extrude

Machining Processes (deforming metal, stamping, trim press, drill)

Profile of a surface

1/8 in.

Gate

Revolve, Extrude

Extrusion, Machining Processes (drilling, boring)

Cylindricity

1/16 in.

Gate Spring

Sweep

Machining (by spring coiling machine)

Cylindricity

1/16 in.

Keyring

Sweep, Loft

Machining (coiling and cut)

Circularity

1/32 in.

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Charm

Extrude

Molding

Circularity

1/32 in.

Parts in the

assembly

Fit type

Dimensional Tolerance limits for Part A & B (inches)

Max. and Min. Clearance or Interference (MMC/LMC)

Body & Gate

Clearance

0.05 ± 0.01

0.02 ± 0.01

Clearance: 0.05 in (LMC)

Body & Charm

Clearance

0.05 ± 0.01

0.02 ± 0.01

Clearance: 0.05 in (LMC)

Gate & Spring

Clearance

0.005 ± 0.001

0.002 ± 0.001

Clearance: 0.005 in (LMC)

Body & Keyring

Keyring is not attached to body of carabiner,

n/a

n/a

n/a