SCHENKELVERSTELLHEBEL FUER ZIRKEL.

摘要

A bearing fulcrum (3) is kept in contact with the flat surface (18) of the leg by the thrust of a reaction spring (11). It is assisted in this by the cooperation of two transversely-retaining side plates engaged against their respective legs (5A, 5B) and comprising auxiliary inward fixing projections at their rear end. A reaction spring directly acts on a bush (12) carrying a half lead nut. This reduces the amount by which the operating end (1) of the lever (L) projects beyond the plane of the respective leg on which it is mounted.