(57) The vertically movable door has a flexible door plate, a hoist mechanism for lifting
and lowering the door plate and a lower beam, which is attached with suspension members,
such as hoist lines (34), to the hoist mechanism. In the edges of the door plate there
are side rails guiding the vertical movement of the door plate. The vertically movable
door has a safety catch, which has a protruding locking cam (56), which attaches to
the side rail. The safety catch prevents the uncontrolled falling of the vertically
movable door due for example to the breaking of the suspension member. The safety
catch comprises a catch plate (30), wherein said locking cam is formed, a turning
axis (32) for attaching the catch plate in a rotating manner to the lower beam of
the vertically movable door and attaching members for attaching the hoist line to
the catch plate. The catch plate is arranged to rotate into a locking position, where
the locking cam is pushed up, when the tension force of the suspension member attached
thereto falls below a predetermined value. Correspondingly the catch plate is arranged
to remain in a standby position, where the locking cam is not protruding, when the
tension force of the suspension member attached thereto exceeds the predetermined
value. The locking cam is arranged to protrude from the vertical edge of the door
plate in the direction of the tangent of the door plate. The side rails comprise a
catch rail (60), which has locking holes (70) for receiving the locking cam.
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