Protective cover for weighing instrument with suspended sliding door

A protective cover for a weighing instrument comprising:

• a sliding door defining a weighing chamber;
• an upper frame formed at an upper edge of the sliding door;
• a lower frame formed at a lower edge of the sliding door;
• an upper guide rail disposed on the upper frame;
• and
• a lower guide rail disposed under the lower frame,
• wherein the upper guide rail suspends the upper frame, and between the upper guide rail and the upper frame, balls are disposed at a plurality of positions in a moving direction of the sliding door,
• wherein a through-hole is formed in a bottom surface of the lower guide rail.

A protective cover for a weighing instrument comprising:

• a sliding door defining a weighing chamber;
• an upper frame formed at an upper edge of the sliding door;
• a lower frame formed at a lower edge of the sliding door;
• an upper guide rail disposed on the upper frame;
• and
• a lower guide rail disposed under the lower frame,
• wherein between the upper guide rail and the upper frame, balls are disposed at a plurality of positions in a moving direction of the sliding door,
• wherein on an upper surface of the upper frame, at each of the plurality of positions, a roller portion is formed for holding the balls that includes:
• a pair of holding portions that each holds the balls in a rollable manner both on a weighing chamber side and a non-weighing chamber side,
• a columnar support that separates the holding portions, and
• wherein through-holes formed in a lower surface of the holding portions expose the balls downward and allow the balls to contact horizontal surfaces of the upper guide rail.