Patent ID: 8261669
Filing Date: 2012-09-11
Classification: E21F

Abstract:
1. A conveyance device, suitable for traveling along a surface, including: two outer gripping members and an inner gripping member located between the two outer gripping members, each gripping member being displaceable between propulsion members provided between adjacent gripping members, each propulsion member having two opposite ends, and being displaceable between a longitudinally contracted position, wherein the ends are displaced towards one another; the propulsion members and the gripping members being configured in order for sequential displacement of the propulsion members and gripping members to cause peristaltic displacement of the conveyance device relative to the surface; the outer gripping members forming a pair of outer gripping members operating in concert so that both outer gripping members are simultaneously in the circumferentially expanded or contracted positions, so that the two outer gripping members are stationary relative to one another when the inner gripping member is displaced between the two outer gripping members.