US Patent 7584555 Hidden-type convertible shoe

A shoe comprising a shoe upper including a male member and a shoe sole including a female receptor for locking with the male member. The male member locks with the female receptor by moving the male member with respect to the female receptor in a first direction, which locks the shoe upper with the shoe sole. The male member unlocks from the female receptor by moving the male member an additional distance further in the first direction, which unlocks the shoe upper from the shoe sole. The female receptor includes resilient arms to hold and release the male member and a stop to prevent movement of the resilient arms in a second direction.