Vertically sliding manual opening and closing door

1. A vertically sliding manual opening and closing door comprising:

a door member configured to open and close an opening section by being slid vertically;

a support member configured to guide the vertical sliding of the door member by a support section configured to support left and right end sections of the door member; and

a lock mechanism configured to position the door member that has been raised, wherein

the lock mechanism includes a lock member attached to an external side surface of the door member and biased to an external side of the lock mechanism by a biasing force of a biasing member, and includes an engaging member that is pushed in an outside direction with respect to the support member by the biasing force of the biasing member formed on the lock member,

the support member includes a cutout portion corresponding to a size of the engaging member, the engaging member configured to pass through the cutout portion when engaged with the cutout portion,

the support member includes a receiving member that receives the engaging member of the lock member from the cutout portion, the receiving member extending outward from a face of the support member, and

the receiving member includes a cover plate that covers the cutout portion.

2. The vertically sliding manual opening and closing door according to claim 1 , wherein

the lock member is formed from a flat plate, and the engaging member extends in a width direction of the lock member.

3. The vertically sliding manual opening and closing door according to claim 2 , wherein,

a handle formed on a bottom end portion of the lock member, the handle being recessed upwards.

4. The vertically sliding manual opening and closing door according to claim 1 , wherein

the biasing member is a spring hinge with a biasing force acting in an opening direction by a spring member that is a pair of pin-linked support plates, the support plates having a rotation shaft underneath and being connected to the door member and the lock member, and an upper side of the lock member is positioned further to the external side of the lock member than a lower side of the lock member when the lock member is in a locked state with the support member.

5. The vertically sliding manual opening and closing door according to claim 1 , wherein

the receiving member is larger in a vertical direction than the cutout portion, and

the engaging member enters the receiving section from below the cutout portion.

6. The vertically sliding manual opening and closing door according to claim 1 , wherein

a lower end of the door member includes is an inclined end that is inclined downwards towards both left and right ends in the width direction of the door member from a center of the inclined end.

7. The vertically sliding manual opening and closing door according to claim 1 , wherein

the engaging member is pushed outward in the outside direction to a released state when the lock mechanism is raised so that the engaging member aligns with the cutout portion, and

the engaging member in the released state enters the receiving member and locks the door member by hanging in the receiving member.