Low-temperature storage

1. A low-temperature storage comprising:

a thermal insulation box main body having an opening in a front surface thereof;

a thermal insulating door openably/closably attached to the thermal insulation box main body;

a medium partition which divides the opening into upper/lower medium openings;

a shelf which divides a storage chamber formed by the thermal insulating door and the main body into upper/lower chambers in a position of the medium partition; and

a cooling device which cools the storage chamber, the low-temperature storage further comprising:

a metallic partition member which further divides the medium openings into upper/lower openings;

a frame member formed of a resin and attached to a front part of the partition member to support gasket; and

a plurality of inner doors which openably close small openings divided by the partition member, the inner doors provided with a packing disposed on back surface peripheral edge portions, with the gasket abutting directly against the packing.

2. The low-temperature storage according to claim 1 , wherein the partition member comprises:

support metals attached to an inner box side surface front portion of the thermal insulation box main body; and

a beam member which is supported by the opposite support metals and to which the frame member is attached and whose cross-sectional surface has a U-shape.

3. The low-temperature storage according to claim 2 , wherein the beam member is laid on and fixed to the support metals.

4. The low-temperature storage according to claim 1 , wherein the gasket comprises:

upper/lower fin pieces which seal the packing above and below a portion abutting on the packing.

5. The low-temperature storage according to claim 1 , wherein the inner door comprises:

a finned packing extending inside the packing and toward the gasket.

6. A low-temperature storage comprising:

a thermal insulation box main body having an opening in a front surface thereof:

a thermal insulating door openably/closably attached to the thermal insulation box main body;

a medium partition which divides the opening into upper/lower medium openings;

a shelf which divides a storage chamber formed by the thermal insulating door and the main body into upper/lower chambers in a position of the medium partition; and

a cooling device which cools the storage chamber, the low-temperature storage further comprising:

a metallic partition member which further divides the medium openings into upper/lower openings:

a frame member formed of a resin and attached to a front part of the partition member to support an optional gasket; and

a plurality of inner doors which openably close small openings divided by the partition member, wherein the gasket abuts on a packing disposed on back surface peripheral edge portions of the upper/lower inner doors, the inner door comprising a finned packing extending inside the packing and toward the optional gasket,

wherein the inner door comprises:

an outer plate;

an inner plate;

a door frame which thermally insulates both the plates and which is formed of a resin; and

an insulating material disposed in a space surrounded with the outer plate, the inner plate, and the door frame, and the door frame is provided with:

a first groove to which the packing is attached; and

a second groove to which the finned packing is attached.

7. A low-temperature storage comprising:

a thermal insulation box main body having an opening in a front surface thereof;

a thermal insulating door openably/closably attached to the thermal insulation box main body; a medium partition which divides the opening into upper/lower medium openings;

a shelf which divides a storage chamber formed by the thermal insulating door and the main body into upper/lower chambers in a position of the medium partition;

a cooling device which cools the storage chamber around −80° C.; and

a partition member which is formed of a metal and which further divides the medium openings into upper/lower openings and to whose front portion a frame member formed of a resin and supporting a gasket is attached, the low-temperature storage further comprising:

a plurality of inner doors which are supported by hinges and which openably close small openings divided by the partition member;

a shaft metal, situate within the box main body;

disposed in portions of the respective small openings on a side on which any hinge is not attached in an inner box of the thermal insulation box main body, and having a shaft portion formed of a cast metal; and

a metallic latch rotatably disposed on the inner door and having a claw portion, with a curved surface formed on the inside thereof, engaging with the shaft metal.

8. The low-temperature storage according to claim 7 , wherein the claw portion has a double structure of a stainless layer and a cast metal layer.

9. The low-temperature storage according to claim 7 , wherein the shaft portion is formed into a columnar shape, and the latch pushes the inner door in a closing direction with the rotating force at a time when the claw portion is engaged with the shaft portion.

10. A low-temperature storage comprising:

a thermal insulation box main body having an opening in a front surface thereof:

a thermal insulating door openably/closably attached to the thermal insulation box main body;

a medium partition which divides the opening into upper/lower medium openings;

a shelf which divides a storage chamber formed by the thermal insulating door and the main body into upper/lower chambers in a position of the medium partition;

a cooling device which cools the storage chamber around −80° C.; and

a partition member which is formed of a metal and which further divides the medium openings into upper/lower openings and to whose front portion a frame member formed of a resin and supporting a gasket is attached, the low-temperature storage further comprising:

a plurality of inner doors which are supported by hinges and which openably close small openings divided by the partition member;

a shaft metal disposed in portions of the respective small openings on a side on which any hinge is not attached in an inner box of the thermal insulation box main body, and having a shaft portion formed of a cast metal; and

a metallic latch rotatably disposed on the inner door and having a claw portion engaging with the shaft metal,

wherein the shaft portion is formed into a columnar shape, and the latch pushes the inner door in a closing direction with the rotating force at a time when the claw portion is engaged with the shaft portion, and

wherein a length of the claw portion is set in such a manner that the inner door is pushed in the closing direction by a dimensional difference between a rotation radius of a tip of an abutment surface of the claw portion with respect to the shaft portion, and a rotation radius of a terminal end.

11. A low-temperature storage comprising:

a thermal insulation box main body having an opening in a front surface thereof;

a single thermal insulating door openably/closably attached to the thermal insulation box main body;

a single medium partition which divides the opening into upper/lower medium openings; a shelf which divides a storage chamber formed by the-thermal insulating door and the main body into upper/lower chambers in a position of the medium partition; and

a cooling device which cools the storage chamber around −80° C., the low-temperature storage further comprising:

two first inner doors which openably close the upper/lower medium openings in a case where a partition member detachably attached to further divide the medium openings into upper/lower small openings is not disposed; or four second inner doors which openably close the four small openings in a case where the partition member is disposed; and

a resin-formed frame member which is attached to the front portion of the partition member to support a gasket the gasket directly abutting on a packing disposed on back surface peripheral edge portions of the second inner doors, and having upper/lower fin pieces to seal the packing above and below a portion which directly abuts on the packing.

12. The low-temperature storage according to claim 11 , wherein the second inner door comprises: a finned packing extending inside the packing and toward the gasket.