Always see during winter time old lady with difficulty dragged through the snow their shopping carts with products, and wheel trucks get stuck in the snow.
I propose by analogy with the runners for baby carriages made of metal of area a small slider, and to them fastened a tin box that tightly would include truck wheel. Length of slider — 200 mm below the removed they were placed at the bottom of the cart bag.
Recommend to read
COMBINATION LOCK
It can be used for protection of vehicles, equipment of various premises. The "key" to the lock is a combination that is dialed using the three buttons. Easy change of code, the...
“Gird-09”
"Gird-09" — the first Soviet experimental rocket, the forerunner of the space rockets of our time. It was created in the Gird (Group of study of reactive motion) under the leadership of...
