Why Do Shopping Carts Suddenly Lock Their Wheels?
What It Is
Some shopping carts abruptly stop rolling when pushed away from a store.
What’s Inside the Wheel
These carts contain a locking mechanism in one wheel.
The system is usually hidden inside the wheel housing.
How the Boundary Works
A wire or signal loop is installed around the store property.
The wheel detects when the cart crosses this boundary.
Why the Wheel Locks
Once the boundary is crossed, the mechanism engages.
The wheel turns sideways and stops rolling.
Why Stores Use This System
It prevents carts from being removed or abandoned.
This reduces loss and damage.
Common Examples
- Carts stopping near parking lot edges
- One wheel suddenly refusing to roll
- Carts working again when returned
Closing Summary
Shopping cart wheels lock because built-in systems detect when the cart leaves store property and activate a safety mechanism.
