Convertible axle structure

A convertible axle structure, comprising

• a first shaft,
• a second shaft parallel to the first shaft, and
• a switch member disposed between the first shaft and the second shaft, the first shaft and the second shaft being jointly pivoted to at least one bearing member;
• an outer wall of the first shaft having a slide groove, an outer wall of the second shaft having a guide groove, the slide groove and the guide groove having a reciprocal segmented relationship of different paths;
• the switch member having a first protrusion slidable in the slide groove and a second protrusion slidable in the guide groove at two opposing sides thereof, the first shaft and the second shaft being turned through the first protrusion and the second protrusion of the switch member to slide in the slide groove and the guide groove, respectively;
• wherein the slide groove includes a front radial slide groove portion which extends along a turning direction of the first shaft, an axial slide groove portion which turns the slide direction of the front radial slide groove portion and extends along an axial direction of the first shaft, and a rear radial slide groove portion which turns the slide direction of the axial slide groove portion and extends along the turning direction of the first shaft;
• the guide groove including a radial guide groove portion which extends along a turning direction of the second shaft and has a path corresponding in position a path integrated by the front radial slide groove portion, the axial slide groove portion, and the rear radial slide groove portion, a front inclined guide groove portion extending obliquely from one end of the radial guide groove portion and corresponding in position to the front radial slide groove portion, a rear inclined guide groove portion extending obliquely from another end of the radial guide groove portion and corresponding in position to the rear radial slide groove portion.