Brief description

A portable, versatile device that combines several individual tools into a single compact unit. It is designed to provide a wide range of functionalities for repair, construction, and survival tasks without the need to carry a heavy toolbox.

Use / Function

• Primary use: General-purpose maintenance, field repairs, and survival situations.
• Secondary uses: Crafting, first aid (removing splinters, cutting bandages), and food preparation.
• Scale: Personal, survival.

Operating principle

The multitool typically operates on a folding mechanism where various tools (blades, drivers, pliers) pivot around a central axle or are stored within handles. When needed, a specific tool is deployed and locked into place for use.

• Leverage: Pliers and cutting tools utilize leverage to amplify force.
• Torque: Screwdrivers transfer rotational force.

How to create it

Minimum functional version

1. Selection: Choose the essential tool heads needed (e.g., a blade and a screwdriver).
2. Fabrication: Forge or grind these tools from steel.
3. Assembly: Create a handle (wood or metal) with a pivot point (bolt or rivet) that allows the tools to rotate in and out.
4. Locking: Implement a simple friction or spring mechanism to keep the tool open during use.

Technical level

• Intermediate to Advanced: Requires precise metalworking, tempering, and assembly skills to ensure the tools are durable and fit together correctly.

Materials needed

• Essential materials:
  • Steel: High-carbon steel for blades (hardness) and tougher steel for pliers/handles (durability).
  • Rivets/Pins: For the pivot points.
• Tools:
  • Forge/Anvil: For shaping metal.
  • Files/Grinder: For sharpening and refining shapes.
  • Drill: For making pivot holes.
• Possible substitutes:
  • Iron: Can be used but will deform easier and hold an edge poorly.
  • Bronze: Suitable for non-critical parts or decoration, but poor for blades/tools.

Variants and improvements

• Pocket Knife Style: Focuses on blades, can openers, and corkscrews (e.g., Swiss Army Knife).
• Plier-based: Built around a central pair of pliers with other tools in the handles.
• Card/Wallet Tools: Flat, single-piece metal with cutouts for wrenches and edges.
• Improvements: Locking mechanisms for safety, replaceable wire cutters, ergonomic grips.

Limits and risks

• Durability: Generally less robust than dedicated, full-sized tools. Heavy torque can break the pivot or the tool itself.
• Ergonomics: Handles are often blocky or uncomfortable during prolonged use.
• Safety: Non-locking blades can fold back on the user’s fingers.