| 摘要 |
The application describes an automatically deployable terrain marking device used to identify off-road safe-travel lanes for vehicles. The marking device has a base comprising a heavy ground engagement dish and a canister set on the ground engagement dish. The canister holds reagents of a foam formation system that can be triggered to form a expanding fluid foam that later hardens. A flexible inelastic base wall forms part of the base and mates to the ground engagement dish to form a sealed compartment containing the canister. A flexible tube frame assembly is communicated with the canister such that the tube frame assembly extends and expands during foam formation. The frame assembly thus has both a compact condition in which at least a part of the assembly folds upon a portion of the base and has an expanded condition in which the assembly is filled with hardened foam.
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