Load support mechanism

A load support mechanism comprising:

• a fixed support section;
• a movable support section that can move in a predetermined direction relative to the fixed support section within a predetermined range and is used to receive a load;
• a fixed cam that is provided in the fixed support section and includes a fixed cam surface;
• a cam groove that is provided in the movable support section, includes a first and a second movable cam surface that face each other, and extends in a direction that crosses a movement direction of the movable support section;
• a cam follower that can move in the cam groove along the cam groove while being in contact with the first or second movable cam surface;
• a first spring that is mounted between the fixed support section and the movable support section to support the load;
• and
• a second spring that presses the cam follower against the fixed cam surface,
• wherein a reaction force of the fixed cam surface against the cam follower contains a first-direction component, which is generated at a position thereof in the predetermined range in which the movable support section can move and which is applied in the movement direction of the movable support section, and a second-direction component which is perpendicular to at least the movement direction of the movable support section, and
• the fixed cam surface has a cam shape by which a load acting around the cam follower, a biasing force of the first spring, the reaction force of the fixed cam surface against the cam follower, and a biasing force of the second spring are balanced in the predetermined range in which the movable support section can move.