GasLock Trolley

• A protective clamp-on accessory was hard to sell → the product is now the cylinder trolley families already buy, with a weighing deck; the shut-off is an optional Plus kit
• Families guess the level by shaking or a wet cloth → gas left in kg and days from the weight minus the cylinder's stamped tare
• The 2026 25/35-day booking lock-out and slow deliveries → a booking clock that starts at the detected delivery and warns when gas will run out before a refill can arrive
• Short-filled cylinders → a door check of net weight, worded as a prompt to ask for the delivery person's verified scale, never a legal measurement
• Cheap load cells creep → days left from a 14-day slope, re-zeroed at every swap; an overload stop protects the cells when a cylinder is dropped on the deck
• Life-safety certification blocked rev A → the base product makes no safety claim; the Plus kit keeps every certification gate

Mother living aloneSon in another cityWall podFamily app

1. 01Trigger: a delivery shows as a 15 kg weight jump and the 25-day lock-out starts
2. 02Learning: daily use is learned as about 0.31 kg/day; the pod shows kg left, days left and the book-from date
3. 03Alert: at 07:00 on the first allowed day the son's phone says booking is open, and the pod's BOOKED key lights
4. 04Action: the mother books and presses BOOKED; the app tracks gas left against the expected delivery

Outcome: The refill is booked weeks before the cylinder runs dry, instead of when the flame dies and the 15–20 day wait starts