MASS-BALANCING ARRANGEMENT AND MICROTOME USING SAME

摘要

A mass-balancing arrangement comprises an adjustably pre-loaded spring member (14); a pivotably mounted lever (16; 31) for compensating different inertial forces in combination with the spring member (14); a first drawing member (24) connecting a movable mass to the lever (16); a second drawing member (17) connecting the spring member (14) to the lever (16); and a first roller (15) for deflecting the first drawing member (24). The lever (16; 31) has an upper lever arm (19; 32) and a lower lever arm (20; 33), one being sector-shaped and the other cam-shaped. The upper lever arm is connected to the movable mass through the first drawing member (24), and the lower lever arm is connected to the spring (14) through the second drawing member (24). Two torques produced at the upper and lower lever arms are kept balanced. The balanced mass may be an object carriage of a microtome.

主权项

1. A mass-balancing arrangement comprising:
a pre-loaded spring member (14); a lever (16, 31) pivotable about a pivot pin (21), the lever having an upper lever arm (19, 32) and a lower lever arm (20, 33) on opposite sides of the pivot pin, wherein one of the upper and lower lever arms includes an outer end surface having a circular-arc contour, and another of the upper and lower lever arms includes an outer end surface having a cam contour; a first drawing member (24) connecting the upper lever arm (19, 32) to a movable mass, wherein a first torque is developed about the pivot pin; and a second drawing member (17) connecting the lower lever arm (20, 33) to the spring member (14), wherein a second torque is developed about the pivot pin in an angular direction opposite the first torque; and a first roller (15) for deflecting the first drawing member (24); wherein the first torque and the second torque are kept balanced with each other during displacement of the movable mass.