Sample measuring device

1. A sample measurement device, comprising:

a rack having a sample storage unit;

a transporting mechanism that transports the rack;

an open/close mechanism provided in the sample storage unit, that holds a sample container when in a closed state, and that releases the sample container when in an open state; and

a sample measurement chamber that stores the sample container released by the open/close mechanism;

wherein

the open/close mechanism changes from the closed state to the open state when an opening force in a horizontal direction is received, and maintains the closed state when a pressing force in a vertical direction is received through the sample container;

the open/close mechanism has a pair of arms;

the pair of arms has a pair of lower ends;

each of the lower ends supports a lower surface of the sample container at an immediately-below position of the sample container while in the closed state, and moves from the immediately-below position to a retracted position deviated to an outer side in the horizontal direction during a state change from the closed state to the open state;

each of the lower ends has a stopper piece and has a deformation portion which deforms by the pressing force in the vertical direction; and

the rack has a structure which restricts an opening movement of each of the lower ends to prevent the state change from the closed state to the open state while the deformation portion is deformed,

wherein the structure is an opening structure that allows the opening movement of each of the lower ends when the stopper piece is at a normal level and that collides with the stopper piece to restrict the opening movement of each of the lower ends when the stopper piece is at a lowered level.

2. The sample measurement device according to claim 1 , wherein

each of the arms has:

an upper end connected to a body of the rack; and

a bending portion that is a portion continuous from a lower side of the upper end and that elastically bends toward the outer side in the horizontal direction in the open state;

wherein each of the lower ends is continuous from a lower side of the bending portion of each of the arms; and

the bending portion produces an elastic recovery force in the open state.

3. The sample measurement device according to claim 2 , wherein

each of the lower ends has:

a base end connected to the lower side of the bending portion;

a contact end that contacts the lower surface of the sample container in the closed state;

a curved portion provided between the base end and the contact end and that is the deformation portion; and

the stopper piece connected to the contact end that moves in an up-and-down direction along with the contact end,

wherein the curved portion elastically deforms when the pressing force in the vertical direction is applied, to lower the contact end and the stopper piece downward.

4. The sample measurement device according to claim 3 , wherein

each of the lower ends has an attachment detachably attached to the lower side of the bending portion, and

the attachment has the base end, the contact end, the curved portion, and the stopper piece.

5. The sample measurement device according to claim 3 , wherein

a guide block is provided on a transport surface on which the rack is placed, and

each of the lower ends has a contact member that contacts the guide block and receives the opening force in the horizontal direction.

6. The sample measurement device according to claim 3 , wherein

the body of the rack has:

a pair of upper openings that store the pair of the bending portions of the pair of the arms; and

a pair of lower openings that form the opening structure, that allow passing of the pair of the lower ends when no pressing force in the vertical direction is applied, and that collide with the pair of the stopper pieces to restrict the passing of the pair of the lower ends when the pressing force in the vertical direction is applied.

7. The sample measurement device according to claim 2 , wherein

each of the arms has an arm body having the upper end and the bending portion, and

each of the lower ends has a support plate that is a member that extends from a lower end of the arm body in an upward direction, that contacts the lower surface of the sample container, and that deforms in a manner to fall toward an inner side in the horizontal direction by the pressing force in the vertical direction.

8. A sample transport device, comprising:

a rack having a sample storage unit to hold a sample container;

a transporting mechanism that transports the rack;

an open/close mechanism provided in the sample storage unit, which: in a closed state, holds a sample container; and, in an open state, releases the sample container; and

wherein

the open/close mechanism changes from the closed state to the open state when an opening force in a horizontal direction is received, and maintains the closed state when a pressing force in a vertical direction is received through the sample container;

the open/close mechanism has a pair of arms;

the pair of arms has a pair of lower ends;

each of the lower ends supports a lower surface of the sample container at a position under the sample container while in the closed state, and is displaced to a retracted position at an outer side in the horizontal direction in the open state to release the sample container;

each of the lower ends has a stopper piece and has a deformation portion which deforms by the pressing force in the vertical direction; and

the rack has a structure which restricts a retracting movement of each of the lower ends to prevent the state change from the closed state to the open state while the deformation portion is deformed,

wherein the structure is an opening structure that allows the opening movement of each of the lower ends when the stopper piece is at a normal level and that collides with the stopper piece to restrict the opening movement of each of the lower ends when the stopper piece is at a lowered level.