Device for detachable fastening of an auxiliary wheel to a wheel of a vehicle

A device for detachably fastening an auxiliary wheel to a main wheel of a vehicle, said wheels each having a circumference and a rim extending around said circumference, said device comprising an annular spacer supported at opposite ends on said rims, and a plurality of tensioning means disposed about said circumferences to tension the auxiliary wheel against the main wheel via said annular spacer, at least one of said rims having a wheel bowl, each of said plurality of tensioning means comprising

• an anchor part connected to said wheel bowl of said one rim,
• a connecting rod having a head engaging said anchor part at one of its ends and having a hook member at the opposite of its ends, said hook member adapted to engage the other of said rims, and
• releasable tension means to tension said connecting rod and tension said hook member when engaged with the other of said rims,
• said anchor part having an outside, an internal aperture receiving said head, an internal passage receiving said connecting rod, an internal narrowing between said aperture and said passage, and a recess extending from said outside to said aperture, said narrowing and said passage, whereby said connecting rod may be detached from said anchor part through said recess when said tension means is released.