Concrete case study

Designing a toolbox that turns into a workbench

Our running project to learn how to move from an attractive idea to a measurable prototype.

The starting idea

We want to design a toolbox that can become a small mobile workbench. Closed, it protects and carries the tools. Open, it offers a stable work surface and accessible storage.

This sentence describes an intention, not yet a product. To move to design, each word has to be turned into a checkable question.

First request to ChatGPT

Help me turn this idea into a project: a portable toolbox that becomes a workbench. Start by asking me the essential questions one at a time. Do not suggest any dimensions until the user, the tools carried and the main use are defined.

Why this project is a good exercise

  • Everyone understands its purpose in a few seconds.
  • It combines storage, ergonomics, structure, mobility and cost.
  • It lets you build a simple prototype before investing.
  • The results can be tested: weight, opening time, stability and access to the tools.

The possible users

H

Occasional DIYer

Wants compact storage, easy to move and simple to open.

M

Mobile technician

Often carries the whole set and needs quick access to the tools.

T

Tradesperson

Looks for more sturdiness, stability and modularity.

The functions to study

FunctionProject questionHow to check it
CarryWhat weight and bulk are acceptable?Weighing, a moving test and loading into a vehicle.
StoreWhich tools must stay immediately accessible?Inventory and a tool-finding test.
WorkWhat surface and height are actually useful?Full-scale mock-up and a user test.
Stay stableWhich actions risk tipping the whole thing over?Careful tests at different points on the top.
DeployHow many steps and how much time are acceptable?Timing with several users.

Five families of concepts

1. The lid becomes the top

A simple solution, but the working height depends on the base used.

2. Folding legs deploy

A good height is possible, with a locking mechanism to make safe.

3. A telescopic structure raises the box

Elegant deployment, but weight, cost and maintenance go up.

4. Several modules stack up

Very adaptable storage, at the cost of a longer assembly.

5. A top links two boxes

A large work surface, but more items to carry.

At this stage, no concept is "the best". The choice will depend on the user profile and the criteria measured. An idea that looks appealing on a drawing may be too heavy, too slow or unstable in reality.

The case-study deliverables

A user-need sheet.
Specifications with data and assumptions kept separate.
A comparison of several concepts.
A material-choice matrix.
A prototype plan and a test protocol.
A decision sheet after each step.

The rule that protects the project

ChatGPT prepares, compares and documents. Reality decides.

Loads, stability, pinch points, locking and safe use must be checked on a prototype and, if needed, by a qualified person.