Low heel shoe convertible to high heel shoe and vice versa with an adjustable shank

A shoe comprising an upper, an insole, a sole having toe and heel ends, a relatively low ground engaging heel fastened permanently to the heel end of said sole for supporting in use the heel of a wearer's foot at a first predetermined elevation above the ground, a relatively high heel, and cooperating connecting means carried by said low and high heels for releasably fastening said high heel to said low heel for supporting in use the heel of a wearer's foot at a second predetermined elevation above the ground higher than said first predetermined elevation, an adjustable shank between said sole and insole, said shank comprising a first leaf anchored in the front part of a shoe sole, a second leaf anchored in the rear part of the shoe sole, a hinge interconnecting adjacent ends of said leaves, a spring biasing said second leaf towards a raised angular position relative to said first leaf, a resilient detent strip having one end fixed to said first strip and its opposite end extending past said hinge to partly overlap said second leaf, means for guiding said strip so that upon relative angular movement of said leaves about said hinge said strip is restrained to move in close parallel relationship over said second leaf and bias it relative to the first leaf in a direction opposite to the bias of said spring, pairs of spaced detents on said strip and said second leaf, each pair comprising a protuberance on one of said strip and said second leaf and a recess on the other of said strip and said second leaf, said pairs of detents being arranged that when said second leaf is raised relative to said first leaf to a first predetermined angular position corresponding to a first condition of a shoe when worn with said high heel attached to said low heel, a first pair of spaced detents snap together to releasably retain said shoe in said first condition, said pairs of detents being arranged that when said second leaf is lowered relative to said first leaf to a second predetermined angular position corresponding to a second condition of a shoe when worn with a low heel, said first pair of detents detach from each other and a second pair of detents snap together to retain said shoe in its second condition.