Pin tumbler lock and boyle’s air pump: what they have in common

1. Step 1. Pin tumbler lock — is part of — Lock and key. The pins keep the cylinder from turning without a key.
2. Step 2. Lock and key — evolved into — Smart lock. An electronic lock.
3. Step 3. Smart lock — has part — Servomotor. A bolt actuator.
4. Step 4. Servomotor — is part of — Insulin pump. A stepper motor moves the plunger.
5. Step 5. Insulin pump — has part — Piston. The reservoir’s plunger.
6. Step 6. Piston — is part of — Boyle’s air pump. A plunger.

Open Evothings