Manual device with two retractable heads carried by a single carriage

A manual device extending in an axial direction comprising:

• a housing having a first housing part having a first distal end and a second housing part having a second distal end opposite the first distal end in the axial direction;
• a first head being axially mobile between a use position in which the first head projects from the housing from the first distal end and a retracted position in which the first head is retracted into housing;
• a second head axially mobile between a use position in which the second head projects from the housing from the second distal end and a retracted position in which the second head is retracted into housing, the first head being in the retracted position when the second head is in the use position while the second head is in the retracted position when the first head is in the use position;
• and a barrel being disposed inside the housing, the first head and the second head both being borne by a carriage that is a single carriage mobile along the axial direction, the carriage being arranged at least partly inside barrel, the first housing part being coupled with the barrel in rotation around the axial direction, while the second housing part is coupled with the carriage in rotation around the axial direction, the carriage being rotatable around the axial direction relative to the first housing part and relative to the barrel, a groove forming a cam path being formed by a first shoulder of the first housing part and by a second shoulder of the barrel while the carriage has a lug cooperating with the groove.