Walking assistance device

A walking assistance device, comprising:

• a pelvic frame configured to be worn on a pelvic part of a user and extending from a lower back of the user to either side of the pelvic part of the user;
• a rotary power generator attached to each side part of the pelvic frame;
• and
• a power transmitting arm having a base end detachably connected to an output member of the rotary power generator, and the power transmitting arm having a free end extending downward from the base end and fitted with a support member for supporting a lower part of a thigh of the user;
• wherein the output member is provided with an upper side face formed on an upper side of the output member, a lower side face formed on a lower side of the output member and a pair of upper and lower grooves formed on a diametrically opposing side of the output member and slanted toward a rotational center shaft of the output member and a free axial end of the shaft;
• and
• wherein the base end of the power transmitting arm comprises a hooking member configured to be engaged by the upper side face of the output member, a latch member provided in a part of the base end diametrically opposing the hooking member and configured to detachably engage the lower side face of the output member, and a pair of slanted engagement faces complementary to the upper and lower grooves of the output member, each slanted engagement face, one slanted engagement face disposed in the base end and the other slanted engagement face disposed in the latch member, make surface to surface contact to the corresponding upper and lower grooves of the output member when the hooking member is hooked on the upper side face and the latch member is engaged by the lower side face.