A force transfer mechanism comprising: a guide housing; a movable unit including a movable body and a pair of handles (33a, 33b), the movable unit being movably installed in the guide housing, wherein an external force is applied to one of the handles (33a, 33b), and wherein the guide housing allows a linear reciprocating motion of the movable unit by the external force applied through the handle (33a, 33b); and a slave unit including a shaft, a slider, and an elastic member, the slave unit being adapted to move in a direction perpendicular to a moving direction of the movable unit by interlocking with the linear reciprocating motion of the movable unit, wherein the movable body of the movable unit is adapted to move in a linear direction by means of the external force applied through the handle (33a, 33b), and comprises: a front side and a rear side, disposed in a direction of the slave unit in slidable contact with inner sides of the guide housing, a cutout groove having one or more inclined surfaces (32a, 32b; 36; 38a, 38b; 40) sloped from the rear side of the movable body; and a through-hole formed from the front side to the rear side in a direction perpendicular to the linear moving direction of the movable body at a part corresponding to the inclined surfaces (32a, 32b; 36; 38a, 38b; 40), and wherein the slave unit comprises: the shaft passing through both the movable body and the guide housing, installed movably, and protruded from one side of the guide housing, the slider linked to the shaft, adapted to keep contact with the inclined surfaces (32a, 32b; 36; 38a, 38b; 40) of the cutout groove during the linear motion of the movable body, and thereby driving the shaft in the direction perpendicular to the linear moving direction of the movable body, and the elastic member installed between the front side of the guide housing and a supporting flange of the shaft outside the guide housing, and adapted to provide an elastic force for returning the movable body and the slave unit to original positions when the external force applied to the movable body is removed. a guide housing; a movable unit including a movable body and a pair of handles (33a, 33b), the movable unit being movably installed in the guide housing, wherein an external force is applied to one of the handles (33a, 33b), and wherein the guide housing allows a linear reciprocating motion of the movable unit by the external force applied through the handle (33a, 33b); and a slave unit including a shaft, a slider, and an elastic member, the slave unit being adapted to move in a direction perpendicular to a moving direction of the movable unit by interlocking with the linear reciprocating motion of the movable unit, wherein the movable body of the movable unit is adapted to move in a linear direction by means of the external force applied through the handle (33a, 33b), and comprises: a front side and a rear side, disposed in a direction of the slave unit in slidable contact with inner sides of the guide housing, a cutout groove having one or more inclined surfaces (32a, 32b; 36; 38a, 38b; 40) sloped from the rear side of the movable body; and a through-hole formed from the front side to the rear side in a direction perpendicular to the linear moving direction of the movable body at a part corresponding to the inclined surfaces (32a, 32b; 36; 38a, 38b; 40), and a front side and a rear side, disposed in a direction of the slave unit in slidable contact with inner sides of the guide housing, a cutout groove having one or more inclined surfaces (32a, 32b; 36; 38a, 38b; 40) sloped from the rear side of the movable body; and a through-hole formed from the front side to the rear side in a direction perpendicular to the linear moving direction of the movable body at a part corresponding to the inclined surfaces (32a, 32b; 36; 38a, 38b; 40), and wherein the slave unit comprises: the shaft passing through both the movable body and the guide housing, installed movably, and protruded from one side of the guide housing, the slider linked to the shaft, adapted to keep contact with the inclined surfaces (32a, 32b; 36; 38a, 38b; 40) of the cutout groove during the linear motion of the movable body, and thereby driving the shaft in the direction perpendicular to the linear moving direction of the movable body, and the elastic member installed between the front side of the guide housing and a supporting flange of the shaft outside the guide housing, and adapted to provide an elastic force for returning the movable body and the slave unit to original positions when the external force applied to the movable body is removed. the shaft passing through both the movable body and the guide housing, installed movably, and protruded from one side of the guide housing, the slider linked to the shaft, adapted to keep contact with the inclined surfaces (32a, 32b; 36; 38a, 38b; 40) of the cutout groove during the linear motion of the movable body, and thereby driving the shaft in the direction perpendicular to the linear moving direction of the movable body, and the elastic member installed between the front side of the guide housing and a supporting flange of the shaft outside the guide housing, and adapted to provide an elastic force for returning the movable body and the slave unit to original positions when the external force applied to the movable body is removed.